CN117498974B - Terminal equipment, peripheral equipment and terminal system - Google Patents

Abstract

The present application provides a terminal device, a peripheral device and a terminal system, wherein the terminal device includes a circuit board, an FM demodulator and a playback unit; at least one metal trace and a first metal ground are provided on the circuit board, wherein one of the metal traces and/or the first metal ground is used to form an FM built-in antenna to receive FM signals; the FM demodulator is connected to the FM built-in antenna and the playback unit, and the FM demodulator is used to demodulate the FM signal received by the FM built-in antenna into an audio signal, and send the audio signal to the playback unit for playback. Thus, even when there is no external earphone, the terminal device can form an FM built-in antenna to receive FM signals through one of the metal traces and/or the first metal ground inside it, and then can use the FM radio function, thereby, the terminal device can use the FM radio function without connecting an FM antenna independent of the terminal device.

Description

Terminal equipment, peripheral equipment and terminal systems

Technical Field

The present application relates to the technical field of FM radio reception, and in particular to a terminal device, a peripheral device and a terminal system.

Background technique

At present, most manufacturers usually choose to castrate the FM radio function when designing mobile phones, tablets and other terminal devices. A small number of mobile phones, tablets and other terminal devices that have not cut out the FM radio function usually use external headphones as FM receiving antennas, but this means that if users want to use the FM radio function, they must wear headphones. When users forget to bring headphones or do not want to wear headphones, they cannot use the FM radio function.

Summary of the invention

To this end, the present application provides a terminal device, a peripheral device and a terminal system, wherein the terminal device can use an FM radio function without connecting to an FM antenna independent of the terminal device.

The first aspect of the present application provides a terminal device, the terminal device includes a circuit board, an FM demodulator and a playback unit; the circuit board is provided with at least one metal trace and a first metal ground, wherein one of the metal traces and/or the first metal ground is used to form an FM built-in antenna to receive FM signals; the FM demodulator is connected to the FM built-in antenna and the playback unit, and the FM demodulator is used to demodulate the FM signal received by the FM built-in antenna into an audio signal, and send the audio signal to the playback unit for playback. Thus, the terminal device does not need to be connected to an FM antenna independent of the terminal device, but can form an FM built-in antenna to receive FM signals through one of the metal traces and/or the first metal ground inside the terminal device to use the FM radio function.

In a possible implementation, the at least one metal trace includes a ground line, a power line, and a signal transmission line. Thus, an FM built-in antenna can be formed through the ground line and/or the first metal ground, or the power line, or the signal transmission line to receive FM signals, and the FM built-in antenna with the most suitable length for receiving FM signals can be selected according to the length of the ground line, the area of the first metal ground, the length of the power line, and the length of the signal transmission line, so as to achieve better reception effect.

In a possible implementation manner, the ground wire and the first metal ground are used to form an FM built-in antenna to receive FM signals. For the terminal device with a small volume and substantially the same length of the ground wire, the power line, and the signal transmission line, the total length of the ground wire and the first metal ground will be closer to the optimal length of the FM signal receiving antenna. Therefore, the ground wire and the first metal ground form an FM built-in antenna to receive FM signals more effectively.

In a possible implementation, the terminal device further includes a first pass FM filter and a stop FM filter, wherein the first pass FM filter is disposed between the FM built-in antenna and the FM demodulator, and the stop FM filter is disposed on the line where other metal traces that do not form the FM built-in antenna are located. Thus, it is possible to prevent the FM signal from being transmitted to other components via the line where the metal traces that do not form the FM built-in antenna are located, and all FM signals can be transmitted to the FM demodulator via the line where the FM built-in antenna is located, thereby reducing energy loss.

In a possible implementation manner, the terminal device further includes a signal amplifier, which is connected between the FM built-in antenna and the FM demodulator, and is used to amplify the FM signal received by the FM built-in antenna and send it to the FM demodulator. Thus, the FM signal entering the FM demodulator can be stronger, better in quality, clearer and more stable.

In a possible implementation, the terminal device further includes a first connection portion, the first connection portion is used to connect to a second connection portion of an external device to access the external device, when the first connection portion of the terminal device is connected to the second connection portion of the external device, at least part of the structure in the external device is used to form an FM extension antenna of the terminal device, the FM extension antenna is connected to the FM built-in antenna to form a FM combination antenna to receive FM signals. Thus, for a terminal device with a smaller volume, the FM built-in antenna inside the terminal device and the FM extension antenna of the external device together serve as an FM combination antenna, which can effectively increase the overall antenna length for receiving FM signals, so that the length of the FM combination antenna is closer to the optimal antenna length for receiving FM signals, thereby achieving better reception of FM signals.

In a possible implementation manner, the first connection portion includes at least one first electrical connection member, and the at least one first electrical connection member is respectively connected to at least one metal routing in the terminal device in a one-to-one correspondence, the peripheral device includes a second metal ground and at least one metal routing corresponding to the at least one metal routing in the terminal device, and the second connection portion includes at least one second electrical connection member, and the at least one second electrical connection member is respectively connected to at least one metal routing in the peripheral device in a one-to-one correspondence; when the first connection portion of the terminal device is connected to the second connection portion of the peripheral device, the at least one metal routing in the peripheral device is respectively connected to the at least one metal routing in the terminal device in a one-to-one correspondence, the second metal ground in the peripheral device and/or one of the target metal routings in the peripheral device form an FM epitaxial antenna of the terminal device, and the FM epitaxial antenna is connected to the FM built-in antenna and together serves as a FM combined antenna to receive FM signals, wherein the target metal routing is a metal routing corresponding to the metal routing forming the FM built-in antenna in the terminal device. Thus, for the terminal device with a smaller volume, when the peripheral device is connected to the terminal device, the metal wiring in the peripheral device corresponding to the metal wiring forming the FM built-in antenna in the terminal device and the FM built-in antenna together form the FM combined antenna to receive FM signals, which can make the length of the antenna for receiving FM signals longer and closer to the optimal length of the FM signal receiving antenna, and the FM signal reception effect is better.

In a possible implementation manner, the first connection portion and the second connection portion are detachably connected, so that the terminal device and the peripheral device can be separated, thereby allowing the terminal device to be connected to different peripheral devices through the first connection portion, and correspondingly, the peripheral device can also be connected to different terminal devices through the second connection portion.

In a possible implementation manner, the first connection portion is a POG PIN connector, wherein the second connection portion is also a POG PIN connector. Thus, when the first connection portion is connected to the second connection portion, it is sufficient to make the two POG PIN connectors contact, which is simple and convenient to use.

In a possible implementation, the terminal device further includes an earphone port, which is connected to the FM demodulator and is used to connect an earphone, wherein when the earphone port is connected to the earphone, at least a portion of the structure of the earphone is used to form an FM external antenna to receive FM signals. Thus, at least a portion of the structure of the earphone can also form an FM external antenna of the terminal device to receive FM signals.

In a possible implementation, the terminal device further includes a switch unit, and the switch unit is used to select the FM demodulator to be connected to one of the FM internal antenna and the headphone port. Thus, by selecting the FM internal antenna or the FM external antenna to be connected to the FM demodulator, the FM signal received from the FM internal antenna or the FM external antenna can be selected to be transmitted to the FM demodulator, and the FM internal antenna or the FM external antenna can be selected to be used as needed.

In a possible implementation, when the earphone port is connected to an earphone, the switch unit selects to connect the FM demodulator to the earphone port, so that the FM demodulator is electrically connected to the earphone and demodulates the FM signal received by the FM external antenna into an audio signal; when the earphone port is not connected to an earphone, the switch unit selects to connect the FM demodulator to the FM internal antenna, so that the FM demodulator demodulates the FM signal received by the FM internal antenna into an audio signal. For the terminal device with a smaller volume, the length of the FM external antenna is usually longer than that of the FM internal antenna, and the FM signal reception effect is better. Therefore, when the earphone port is connected to an earphone, the FM signal received by the FM external antenna is transmitted to the FM demodulator by default. When the earphone port is not connected to an earphone, the FM signal received by the FM internal antenna is transmitted to the FM demodulator by default, so that the audio signal demodulated by the FM demodulator has higher quality.

In a possible implementation, the switch unit includes a single-pole single-throw switch, which is connected between the FM built-in antenna and the FM demodulator. When the earphone is connected to the earphone port, the single-pole single-throw switch is disconnected; when the earphone is not connected to the earphone port, the single-pole single-throw switch is closed; or, the switch unit includes a single-pole double-throw switch, which is connected between the FM built-in antenna, the earphone port and the FM demodulator. When the earphone is connected to the earphone port, the single-pole double-throw switch electrically connects the earphone port to the FM demodulator; when the earphone is not connected to the earphone, the single-pole double-throw switch electrically connects the FM built-in antenna to the FM demodulator. Thus, the single-pole single-throw switch or the single-pole double-throw switch can be used to connect the FM demodulator to the earphone port when the earphone is connected to the earphone port, and to connect the FM demodulator to the FM built-in antenna when the earphone is not connected to the earphone, and the structure is simple.

In a possible implementation, the terminal device further includes a detection module, the detection module is connected to the FM demodulator, and the detection module is used to detect the quality of the FM signal received by the FM internal antenna and the quality of the FM signal received by the FM external antenna by detecting the audio signal demodulated and output by the FM demodulator; the switch unit is used to select to connect the FM demodulator to the FM internal antenna or the headphone port according to the quality of the FM signal received by the FM internal antenna and the quality of the FM signal received by the FM external antenna detected by the detection module. Thus, the quality of the FM signal received by the FM internal antenna and the FM external antenna can be detected by the detection module, and the FM internal antenna or the FM external antenna with better signal quality can be selected to receive the FM signal, which can effectively improve the communication performance.

In a possible implementation, the switch unit selects to connect the FM demodulator to the FM internal antenna when the quality of the FM signal received by the FM internal antenna is higher than the quality of the FM signal received by the FM external antenna; and selects to connect the FM demodulator to the headphone port when the quality of the FM signal received by the FM external antenna is higher than the quality of the FM signal received by the FM internal antenna. Thus, the FM signal transmitted to the FM demodulator can be the FM signal with higher quality between the FM signal received by the FM internal antenna and the FM signal received by the FM external antenna.

In a possible implementation manner, the switch unit includes a first single-pole single-throw switch and a second single-pole single-throw switch, the first single-pole single-throw switch is connected between the FM built-in antenna and the FM demodulator, and the second single-pole single-throw switch is connected between the headphone port and the FM demodulator, and when the quality of the FM signal received by the FM built-in antenna is higher than the quality of the FM signal received by the FM external antenna, the first single-pole single-throw switch is closed and the second single-pole single-throw switch is opened; when the quality of the FM signal received by the FM external antenna is higher than the quality of the FM signal received by the FM built-in antenna, the first single-pole single-throw switch is closed and the second single-pole single-throw switch is opened. The single-throw switch is disconnected and the second single-pole single-throw switch is closed; or the switch unit includes a single-pole double-throw switch, and the single-pole double-throw switch is connected between the FM demodulator, the FM built-in antenna and the headphone port. When the quality of the FM signal received by the FM built-in antenna is higher than the quality of the FM signal received by the FM external antenna, the single-pole double-throw switch electrically connects the FM built-in antenna with the FM demodulator; when the quality of the FM signal received by the FM external antenna is higher than the quality of the FM signal received by the FM built-in antenna, the single-pole double-throw switch electrically connects the headphone port with the FM demodulator. Therefore, when the switch unit includes a first single-pole single-throw switch and a second single-pole single-throw switch, the first single-pole single-throw switch and the second single-pole single-throw switch are used to transmit the FM signal with higher quality between the FM signal received by the FM built-in antenna and the FM signal received by the FM external antenna to the FM demodulator; when the switch unit includes a single-pole double-throw switch, the single-pole double-throw switch is used to transmit the FM signal with higher quality between the FM signal received by the FM built-in antenna and the FM signal received by the FM external antenna to the FM demodulator, and the structure is simple.

In a possible implementation, the playback unit includes an audio power amplifier and an audio output component, the audio power amplifier is connected to the FM demodulator and the audio output component, the audio power amplifier is used to amplify the power of the audio signal demodulated by the FM demodulator, and the audio output component is used to output audio. Thus, the audio output by the audio output component can be less distorted and of better quality.

The second aspect of the present application provides a peripheral device, including a second connection part, the second connection part is used to connect with the first connection part of the aforementioned terminal device, when the second connection part of the peripheral device is connected to the first connection part of the terminal device, at least part of the structure in the peripheral device is used to form an FM extension antenna of the terminal device, the FM extension antenna is connected with the FM built-in antenna to form a FM combination antenna to receive FM signals. Thus, when the peripheral device is connected to a terminal device with a smaller volume, the FM extension antenna of the peripheral device and the FM built-in antenna of the terminal device together form the FM combination antenna, which can make the length of the FM combination antenna closer to the optimal antenna length for receiving FM signals, thereby achieving better reception of FM signals.

In a possible implementation, the peripheral device includes a second metal ground and at least one metal routing corresponding to the at least one metal routing in the terminal device, the second connection portion includes at least one second electrical connector, and the at least one second electrical connector is respectively connected to the at least one metal routing in the peripheral device in a one-to-one correspondence; when the second connection portion of the peripheral device is connected to the first connection portion of the terminal device, the at least one metal routing in the peripheral device is respectively connected to the at least one metal routing in the terminal device in a one-to-one correspondence, at least the second metal ground in the peripheral device and/or one of the target metal routings in the peripheral device forms an FM epitaxial antenna of the terminal device, and the FM epitaxial antenna is connected to the FM built-in antenna of the terminal device to form an FM combined antenna to receive FM signals; wherein the target metal routing is a metal routing corresponding to the metal routing forming the FM built-in antenna in the terminal device, and the first connection portion includes at least one first electrical connector, and the at least one first electrical connector is respectively connected to the at least one metal routing in the terminal device in a one-to-one correspondence. Thus, when the second connecting part of the peripheral device is connected to the first connecting part of the terminal device, the metal routing in the peripheral device corresponding to the metal routing forming the FM built-in antenna in the terminal device and/or the second metal ground and the FM built-in antenna together form the FM combined antenna to receive FM signals. For the terminal device with a smaller volume, the length of the antenna for receiving FM signals can be made longer and closer to the optimal length of the FM signal receiving antenna, thereby achieving a better FM signal reception effect.

In a possible implementation, the FM built-in antenna in the terminal device is formed by the first metal ground and the ground wire of the terminal device, the peripheral device further includes a Bluetooth antenna and a second FM filter, the second FM filter is connected between the Bluetooth antenna and the second metal ground of the peripheral device, the second metal ground in the peripheral device, the ground wire in the peripheral device and the Bluetooth antenna form the FM extension antenna, and when the peripheral device is connected to the terminal device, the FM extension antenna in the peripheral device and the FM built-in antenna in the terminal device jointly form the FM combination antenna. Thus, when the peripheral device is connected to the peripheral device, the Bluetooth antenna, the metal ground of the peripheral device, the ground wire of the peripheral device and the FM built-in antenna in the terminal device jointly form the FM combination antenna, and for the terminal device with a smaller volume, the length of the antenna for receiving FM signals can be made longer, closer to the optimal antenna length for receiving FM signals, and the FM signal reception effect is better.

In a possible implementation, the peripheral device is a keyboard. Since the keyboard has the at least one relatively long metal trace and the second metal ground, when the keyboard is used as the peripheral device and is connected to the terminal device with a relatively small volume, the metal traces in the keyboard corresponding to the metal traces forming the FM built-in antenna in the terminal device and the FM built-in antenna together form the FM combined antenna to receive FM signals, which can make the length of the antenna for receiving FM signals longer and closer to the optimal length of the FM signal receiving antenna, and thus achieve better FM signal reception effect.

The third aspect of the present application provides a terminal system, including the aforementioned terminal device and the aforementioned peripheral device. Thus, when receiving FM signals without wearing headphones that may affect hearing for a long time, the terminal device can be connected to the peripheral device, and the metal traces in the peripheral device corresponding to the metal traces forming the FM built-in antenna in the terminal device and the FM built-in antenna together form the FM combined antenna to receive FM signals, so that the length of the antenna receiving the FM signal is longer, closer to the optimal length of the FM signal receiving antenna, and the FM signal reception effect is better.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the implementation manner will be briefly introduced below. Obviously, the drawings described below are some implementation manners of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

FIG1 is a schematic diagram of the structure of a terminal system provided in some embodiments of the present application;

FIG2 is a circuit structure block diagram of a terminal device provided in some embodiments of the present application;

FIG3 is a schematic diagram of the structure of a terminal device under a first viewing angle provided by some embodiments of the present application;

FIG4 is a schematic diagram of the structure of a terminal device under a second viewing angle provided by some embodiments of the present application;

FIG5 is a circuit structure block diagram of a peripheral device provided in some embodiments of the present application;

FIG6 is a circuit structure block diagram of a terminal device and a headset provided in some embodiments of the present application;

FIG7 is a circuit structure block diagram of a terminal device and a headset provided in some other embodiments of the present application;

FIG8 is a circuit structure block diagram of a terminal device and a headset provided in some other embodiments of the present application;

FIG9 is a circuit structure block diagram of a terminal device and a headset provided in some other embodiments of the present application;

FIG10 is a circuit structure block diagram of a terminal device provided in some other embodiments of the present application;

FIG11 is a circuit structure block diagram of a terminal device provided in some other embodiments of the present application.

Detailed ways

The embodiments of the present application are described below in conjunction with the accompanying drawings.

As shown in Fig. 1, in some embodiments, the terminal system 1000 includes a terminal device 100 and a peripheral device 200. The terminal device 100 can be connected to the peripheral device 200, and the peripheral device 200 serves as an external device of the terminal device 100, and provides auxiliary expansion functions for the terminal device 100, or can also act on the terminal device 100, and so on.

Among them, the terminal device 100 is a portable terminal device with input and output functions and two-way communication functions, for example, it can be but not limited to portable terminal devices such as tablet computers, laptops, mobile phones and watches, and the peripheral device 200 can be but not limited to keyboards, display screens, chargers and power banks, etc.

As shown in FIG2 , in some embodiments, the terminal device 100 includes a first circuit board 10, an FM demodulator 11, and a playback unit 12. The first circuit board 10 is provided with at least one first metal trace 101 and a first metal ground 102, wherein one of the first metal traces (GND1, Vcc1, or Data1) and/or the first metal ground 102 is used to form an FM built-in antenna 103 to receive FM signals. The FM demodulator 11 is connected to the FM built-in antenna 103 and the playback unit 12, and the FM demodulator 11 is used to demodulate the FM signal received by the FM built-in antenna 103 into an audio signal, and send the audio signal to the playback unit 12 for playback.

Therefore, the terminal device 100 does not need to be connected to an FM antenna independent of the terminal device 100, but can form an FM built-in antenna 103 to receive FM signals through one of the first metal traces (GND1, Vcc1 or Data1) and/or the first metal ground 102 inside itself, and thus can use the FM radio function.

Among them, the frequency range of FM signals is generally between 88 and 108 megahertz (MHz). Generally speaking, when the antenna size is 1/4 of the wavelength corresponding to the received FM signal, the antenna efficiency is the highest. The wavelength corresponding to the FM signal is the propagation speed/frequency of the FM signal, and the propagation speed of the FM signal is the speed of light. Therefore, according to the theoretical optimal antenna length calculation formula, the antenna length (in meters) = speed of light/(frequency×4), where the speed of light is about 3× ¹⁰⁸ meters/second. Therefore, the theoretical optimal antenna length for FM signals is about 0.7~0.85 meters. It should be noted that this is only the theoretical optimal antenna length. In actual applications, even if the length of the FM receiving antenna is less than the optimal antenna length, as long as it is not too small, it can still meet the reception efficiency requirements of FM signals.

In the present application, when the terminal device 100 is relatively large in size, the FM built-in antenna 103 is formed by one of the first metal traces (GND1, Vcc1 or Data1) and/or the first metal ground 102 to receive FM signals. Since the traces GND1, Vcc1 or Data1 extend from the connection interface to the internal mainboard in the terminal device 100, they are often relatively long. In particular, the first metal ground 102 located on the first circuit board 10 is generally relatively large, which makes the equivalent electrical length longer. Therefore, the reception efficiency requirements of FM signals can be met.

The FM demodulator is a device or circuit for demodulating frequency modulated (FM) signals. Generally speaking, the information to be transmitted is carried on a carrier wave, and an FM signal is generated by carrier modulation. The main function of the FM demodulator is to restore the FM modulated signal to the original baseband signal to obtain the information carried on the carrier wave. Specifically, the FM modulated signal can be restored to the original baseband signal through a specific demodulation algorithm or circuit to obtain the information carried in the carrier wave. Furthermore, the FM demodulator may also include a filter, which is used to remove noise and unnecessary frequency components in the demodulated signal.

The at least one first metal trace 101 and the first metal ground 102 may be made of metal materials with good electrical conductivity, such as copper and/or aluminum.

In some embodiments, as shown in FIG. 3 and FIG. 4 , the terminal device 100 further includes a housing 13 and a display screen 14, and the first circuit board 10, the FM demodulator 11, and the playback unit 12 are all arranged in an internal cavity formed by connecting the housing 13 and the display screen 14. Thus, the appearance of the terminal device 100 can be made more beautiful. In some embodiments, the display screen 14 can be a touch screen, specifically, a resistive touch screen, a capacitive touch screen, or a surface acoustic wave touch screen. In other embodiments, the display screen 14 can also be a non-touch display screen.

The first circuit board 10 may be a flexible circuit board (FPC) or a rigid circuit board (PCB), or a part of the first circuit board 10 may be a flexible circuit board and the other part of the first circuit board may be a rigid circuit board.

As shown in Figure 2, in some embodiments, the first circuit board 10 includes a first flexible circuit board 104 and a first main board 105, wherein the first main board 105 is a rigid circuit board, the first flexible circuit board 104 and the first main board 105 are located in an internal cavity formed by connecting the shell 13 and the display screen 14, the first flexible circuit board 104 is connected to the first main board 105, and the FM demodulator 11 and at least part of the playback unit 12 are arranged on the first main board 105.

As shown in FIG2 , most of each of the at least one first metal trace 101 is disposed on the first flexible circuit board 104, and each of the at least one first metal trace 101 also partially extends and is disposed on the first main board 105, and is connected to corresponding components located on the first main board 105. The first metal ground 102 may be located only on the first flexible circuit board 104, that is, it may be only a metal ground structure in the first flexible circuit board 104.

As shown in FIG2 , in some embodiments, a first connector 15 is further provided between the first mainboard 105 and the first flexible circuit board 104, and the first mainboard 105 and the first flexible circuit board 104 can be connected through the first connector 15. The first connector 15 may include a socket connector (not indicated) and an elastic contact connector (not indicated). The elastic contact connector is provided on the first flexible circuit board 104, and the socket connector is provided on the first mainboard 105. The pin or contact piece of the elastic contact connector is inserted into the socket connector so that the first mainboard 105 or the first flexible circuit board 104 can achieve reliable electrical connection, wherein the elastic contact connector may be a flexible circuit board connector (FPC) or a flexible flat cable connector (FFC). In other embodiments, the first connector 15 may also be other types of connectors, and is not limited to the types exemplified above.

In which, when a first connector 15 is further provided between the first mainboard 105 and the first flexible circuit board 104, each metal trace of the at least one first metal trace 101 is divided into two sections, one of which is provided on the first flexible circuit board 104 and extends to the first connector 15, and the other section is provided on the first mainboard 105 and also extends to the first connector 15, and is connected into a whole metal trace through the first connector 15.

As shown in FIG2 , in some embodiments, the at least one first metal wiring 101 includes a first ground line GND1, a first power line Vcc1, and a first signal transmission line Data1. Thus, an FM built-in antenna 103 can be formed through the first ground line GND1 and/or the first metal ground 102, or the first power line Vcc1, or the first signal transmission line Data1 to receive FM signals, and the FM built-in antenna 103 with the most suitable length for receiving FM signals can be selected according to the length of the first ground line GND1, the area of the first metal ground 102, the length of the first power line Vcc1, and the length of the first signal transmission line Data1 to achieve better reception.

It should be understood that one of the first metal traces (GND1, Vcc1 or Data1) and/or the first metal ground 102 is used to form the FM built-in antenna 103 to receive FM signals. The first metal ground 102 can form the FM built-in antenna 103 alone or together with the first ground line GND1 to form the FM built-in antenna 103, but cannot form the FM built-in antenna 103 together with the first power line Vcc1 and the first signal transmission line Data1.

Among them, "one of the first metal traces (GND1, Vcc1 or Data1) and/or the first metal ground 102 is used to form the FM built-in antenna 103 to receive FM signals" can be understood as "one of the first metal traces (GND1, Vcc1 or Data1) and/or the first metal ground 102 is used as the FM built-in antenna 103 to receive FM signals", that is, at least one of the first metal traces 101 and the first metal ground 102 can also be used as the FM built-in antenna 103 to receive FM signals without changing the structure when realizing the original function. For example, the original function of the first power line Vcc1 is to transmit power signals. If its structure remains unchanged, it can also be used as the FM built-in antenna 103 to receive FM signals.

As shown in FIG2 , in some embodiments, the first ground line GND1 and the first metal ground 102 form the FM built-in antenna 103 to receive FM signals, that is, in some embodiments, the FM built-in antenna 103 can be formed by the first ground line GND1 and the first metal ground 102. Since the area of the first metal ground 102 in the terminal device 100 is larger than the area of the first power line Vcc1 and the first signal transmission line Data1, and the first metal ground 102 is usually connected to the first ground line GND1, when the first ground line GND1 and the first metal ground 102 form the FM built-in antenna 103, the total length will be closer to the optimal FM receiving antenna length, and the FM signal reception effect will be better.

In some embodiments, the first ground wire GND1 and the first metal ground 102 are arranged on different layers of the first circuit board 10, and a via (not marked) may be provided on the first circuit board 10, and the first ground wire GND1 may be connected to the first metal ground 102 through the via. When the first ground wire GND1 and the first metal ground 102 form the FM built-in antenna 103, the FM demodulator 11 is connected to the first ground wire GND1, and the first ground wire GND1 and the first metal ground 102 together serve as the FM built-in antenna 103 to receive FM signals, and the received FM signals may be transmitted to the FM demodulator 11 through the first ground wire GND1.

In some other embodiments, the first metal ground 102 can also be connected to the first ground wire GND1 through a metal wire (not shown). Specifically, one end of the metal wire is connected to the first metal ground 102 located on the first flexible circuit board 104, and the other end is connected to the first ground wire GND1. For example, when the first ground wire GND1 is partially extended and arranged on the first main board 105, one end of the metal wire is connected to the first metal ground 102 located on the first flexible circuit board 104, and the other end is connected to the portion of the first ground wire GND1 located on the first main board 105. The first metal ground 102, the metal wire and the first ground wire GND1 form the FM built-in antenna to receive FM signals, and can be transmitted to the FM demodulator 11 through the first ground wire GND1.

As shown in FIG2 , in some embodiments, the terminal device 100 further includes a first pass FM filter 16 and a stop FM filter 17, wherein the first pass FM filter 16 is disposed between the FM built-in antenna 103 and the FM demodulator 11, and the stop FM filter 17 is disposed on the line where the first metal trace that does not form the FM built-in antenna is located. Thus, the FM signal can be prevented from being transmitted to other components via the line where the first metal trace that does not form the FM built-in antenna is located, and can be transmitted to the FM demodulator 11 via the line where the FM built-in antenna 103 is located, thereby reducing the degree of attenuation of the FM signal transmitted to the FM demodulator 11.

Among them, the first-pass FM filter 16 in the present application may refer to a filter that allows FM signals to pass through, and the blocking FM filter (hereinafter referred to as the first blocking FM filter 171, the second blocking FM filter 172, the third blocking FM filter 173 and the fourth blocking FM filter 29) may refer to a filter that prevents FM signals from passing through.

Further, the first-pass FM filter 16 may refer to a filter that allows only FM signals to pass therethrough.

As shown in Figure 2, in some embodiments, when the first ground line GND1 and the first metal ground 102 form the FM built-in antenna 103, the first pass FM filter 16 is arranged on the line where the first ground line GND1 is located, and the blocking FM filter 17 includes a first blocking FM filter 171 and a second blocking FM filter 172, the first blocking FM filter 171 is arranged on the line where the first power line Vcc1 is located, and the second blocking FM filter 172 is arranged on the line where the first signal transmission line Data1 is located.

As shown in Figure 2, in some embodiments, the terminal device 100 also includes a third-blocking FM filter 173, and the third-blocking FM filter 173 is connected between the first ground wire GND1 and the ground of the first mainboard 105. Therefore, when the first ground wire GND1 and the first metal ground 102 form the FM built-in antenna 103, the third-blocking FM filter 173 is used to prevent the FM signal received by the FM built-in antenna 103 from flowing into the ground of the first mainboard 105, so that the FM signal can only be transmitted to the FM demodulator 11.

The first ground wire GND1 can be electrically connected to the ground of the first mainboard 105 through the third resistance FM filter 173 to achieve grounding, and as mentioned above, the first metal ground 102 and the first ground wire GND1 can be electrically connected through a through hole or a metal wire, so the first metal ground 102 can also be grounded through the first ground wire GND1. Since the third resistance FM filter 173 only blocks the FM signal from passing through, but does not block other signals from passing through, for example, does not block the DC signal from passing through, the third resistance FM filter 173 is equivalent to an electrical connector connecting the first ground wire GND1 and the first metal ground 102, and realizes the electrical connection between the first ground wire GND1 and the ground of the first mainboard 105, and at the same time, the third resistance FM filter 173 blocks the FM signal from passing through, and allows the FM signal to be transmitted only to the FM demodulator 11.

In some embodiments, as shown in FIG2 , the terminal device 100 further includes a signal amplifier 18, which is connected between the FM internal antenna 103 and the FM demodulator 11, and is used to amplify the FM signal received by the FM internal antenna 103 and send it to the FM demodulator 11. Thus, the FM signal entering the FM demodulator 11 can be made stronger, better in quality, clearer and more stable.

Among them, the signal amplifier 18 can be an LNA (Low Noise Amplifier) amplifier. The LNA amplifier can provide high gain and low noise factor. The high gain ensures that the input signal is fully amplified when passing through the amplifier so that the subsequent circuit can effectively process it. The low noise factor means that the noise introduced by the LNA amplifier is as small as possible to maintain the clarity and accuracy of the signal. Therefore, after the FM signal received by the FM built-in antenna 103 is amplified by the LNA amplifier, the signal strength is stronger, the quality is better, and it is clearer and more stable. It should be noted that the signal amplifier 18 can also be other types of amplifiers that can make the FM signal stronger, better, clearer and more stable after amplification, and is not limited to an LNA amplifier.

In other embodiments, when the FM signal receiving efficiency of the FM built-in antenna 103 itself is relatively high, the terminal device 100 may not include the signal amplifier 18, and the signal amplifier 18 may be replaced by a resistor connected between the FM built-in antenna 103 and the FM demodulator 11. For example, when the FM receiving efficiency of the FM built-in antenna 103 itself meets the requirements through testing, and the quality of the FM signal received by the FM built-in antenna 103 is relatively high, it is not necessary to amplify the received FM signal. In this case, the terminal device 100 may not include the signal amplifier 18.

In some embodiments, the terminal device 100 further includes a first capacitor C1 , wherein the first capacitor C1 is connected between the first-pass FM filter 16 and the FM demodulator 11 , and the first capacitor C1 is used to block the passage of a DC signal.

In some embodiments, as shown in FIG. 2 and FIG. 5 , the terminal device 100 further includes a first connection portion 21, the first connection portion 21 being used to connect to a second connection portion 22 of an external device 200 to access the external device 200; when the first connection portion 21 of the terminal device 100 is connected to the second connection portion 22 of the external device 200, at least part of the structure in the external device 200 is used to form an FM extension antenna 24 of the terminal device 100, and the FM extension antenna is connected to the FM built-in antenna 103 to form an FM combination antenna to receive FM signals. Thus, for a terminal device 100 with a relatively small volume, the FM built-in antenna 103 inside the terminal device 100 and the FM extension antenna 24 of the external device 200 together form an FM combination antenna, which can make the length of the FM combination antenna closer to the optimal antenna length for receiving FM signals, thereby achieving a better reception effect of FM signals.

In some embodiments, as shown in Figure 2, the first connecting portion 21 includes at least one first electrical connector 210, and the at least one first electrical connector 210 is respectively connected one-to-one with at least one first metal trace 101 in the terminal device 100. As shown in Figure 5, the peripheral device 200 includes a second metal ground 23 and at least one second metal trace 230 corresponding to the at least one first metal trace 101 in the terminal device 100, and the second connecting portion 22 includes at least one second electrical connector 220, and the at least one second electrical connector 220 is respectively connected one-to-one with at least one second metal trace 230 in the peripheral device 200. When the first connection part 21 of the terminal device 100 is connected to the second connection part 22 of the peripheral device 200, the at least one second metal routing 230 in the peripheral device 200 is respectively connected to the at least one first metal routing 101 in the terminal device 100, and the second metal ground 23 in the peripheral device 200 and/or one of the target metal routings in the peripheral device 200 form an FM epitaxial antenna 24, and the FM epitaxial antenna 24 and the FM built-in antenna 103 together form an FM combined antenna to receive FM signals, wherein the target metal routing is a second metal routing corresponding to the first metal routing forming the FM built-in antenna 103 in the terminal device 100. Thus, when the terminal device 100 is connected to the peripheral device 200, the second metal routing in the peripheral device 200 corresponding to the first metal routing forming the FM built-in antenna 103 in the terminal device 100 forms a FM combined antenna together with the FM built-in antenna 103 to receive FM signals. For the terminal device 100 with a smaller volume, the length of the antenna for receiving FM signals can be made longer and closer to the optimal length of the FM signal receiving antenna, thereby achieving a better FM signal reception effect.

In some embodiments, the first connection portion 21 and the second connection portion 22 are detachably connected, thereby allowing the terminal device 100 to be connected to different peripheral devices 200 through the first connection portion 21, and correspondingly, the peripheral device 200 can also be connected to different terminal devices 100 through the second connection portion 22.

The detachable connection may be, but is not limited to, a plug-in connection or a magnetic connection.

In some embodiments, the first connection portion 21 is a POGPIN connector, wherein the second connection portion 22 is also a POGPIN connector. The at least one first electrical connector 210 included in the first connection portion 21 and the at least one second electrical connector 220 included in the second connection portion 22 may be a conductive contact area. Thus, when the first connection portion 21 and the second connection portion 22 are connected, it is sufficient to make the two POGPIN connectors contact, which is simple and convenient to use.

Wherein, when the first connection part 21 and the second connection part 22 are POGPIN connectors, the connection surfaces of the first connection part 21 and the second connection part 22 facing each other when connected to each other can be made of insulating materials, and the at least one first electrical connector 210 included in the first connection part 21 can be a conductive member disposed on the connection surface of the first connection part 21, and penetrates the connection surface of the first connection part 21, and is at least partially exposed from the first connection part 21, and can extend to the interior of the first connection part 21 and be electrically connected one by one with the corresponding at least one first metal trace 101. Similarly, the at least one second electrical connector 220 included in the second connection part 22 can be a conductive member disposed on the connection surface of the second connection part 22, and penetrates the connection surface of the second connection part 22, and is at least partially exposed from the second connection part 22, and can extend to the interior of the second connection part 22 and be electrically connected one by one with the corresponding at least one second metal trace 230.

Among them, when the first connecting part 21 and the second connecting part 22 are POGPIN connectors, the first connecting part 21 and the second connecting part 22 are both at least one pin, that is, the first connecting part 21 and the second connecting part 22 can each have at least one conductive contact, and are not limited to the three conductive contacts marked in Figures 2 and 5. When there is only one conductive contact, the metal trace serving as the FM extended antenna 24 in the peripheral device 200 is connected to the conductive contact in the second connecting part 22, and the metal trace serving as the FM built-in antenna 103 in the terminal device 100 is connected to the conductive contact in the first connecting part 21.

In other embodiments, the first connection portion 21 and the second connection portion 22 may both be interfaces, the interface of the terminal device 100 is connected to at least one first metal trace 101 in the terminal device 100, and the interface of the peripheral device 200 is connected to at least one second metal trace 230 in the peripheral device 200, and the first connection portion 21 and the second connection portion 22 are respectively connected through the two ends of the data line, so that the terminal device 100 is connected to the peripheral device 200, wherein the data line may be but is not limited to the Type-C line, USB line or serial port data line, etc. Wherein, when the first connection portion 21 and the second connection portion 22 are both interfaces, the at least one first electrical connection member 210 included in the first connection portion 21 and the at least one second electrical connection member 220 included in the second connection portion 22 may be pins.

As shown in FIG. 5 , the at least one second metal wiring 230 includes a second ground line GND2 , a second power line Vcc2 , and a second signal transmission line Data2 .

As shown in FIG2 , the first connecting portion 21 is connected to the first ground line GND1, the first power line Vcc1 and the first signal transmission line Data1; as shown in FIG5 , the second connecting portion 22 is connected to the second ground line GND2, the second power line Vcc2 and the second signal transmission line Data2; when the first connecting portion 21 is connected to the second connecting portion 22, the first ground line GND1 is connected to the second ground line GND2, the first power line Vcc1 is connected to the second power line Vcc2, and the first signal transmission line Data1 is connected to the second signal transmission line Data2.

When the first ground line GND1 and the first metal ground 102 in the terminal device 100 form the FM built-in antenna 103, the target metal routing line for forming the FM extension antenna 24 in the peripheral device 200 is the second ground line GND2. When the first power line Vcc1 in the terminal device 100 forms the FM built-in antenna 103, the target metal routing line for forming the FM extension antenna 24 in the peripheral device 200 is the second power line Vcc2. When the first signal transmission line Data1 in the terminal device 100 forms the FM built-in antenna 103, the target metal routing line for forming the FM extension antenna 24 in the peripheral device 200 is the second signal transmission line Data2.

In some embodiments, as shown in FIG6 , the terminal device 100 further includes an earphone jack 19, which is connected to the FM demodulator 11 and is used to connect an earphone 300, wherein when the earphone 300 is connected to the earphone jack 19, at least a portion of the structure of the earphone 300 is used to form an FM external antenna 301 to receive FM signals. Thus, at least a portion of the structure of the earphone 300 can also form an FM external antenna 301 to receive FM signals.

The headphone jack 19 may be, but is not limited to, a Type-C headphone jack and/or a 3.5mm headphone jack.

The metal wire part in the earphone 300 can form an FM external antenna 301. The "formation" here can be understood as "serving as", that is, the metal wire part in the earphone 300 serves as the FM external antenna 301, that is, the structure of the metal wire in the earphone 300 can also serve as the FM external antenna 301 to receive FM signals without changing when realizing the original function. Specifically, the metal wire in the earphone 300 not only has the original function of transmitting audio signals, but also has the function of receiving FM signals. The earphone 300 can specifically be a wired earphone, and the metal wire in the earphone 300 can include the metal wire in the earphone cable, for example, can include the metal wire such as the ground wire in the earphone cable.

In some embodiments, as shown in FIG6 , the terminal device 100 further includes a switch unit SW, and the switch unit SW is used to select the FM demodulator 11 to be connected to one of the FM internal antenna 103 and the headphone port 19. Thus, by selecting the FM internal antenna 103 or the FM external antenna 301 to be connected to the FM demodulator 11, the FM signal received from the FM internal antenna 103 or the FM external antenna 301 can be selected to be transmitted to the FM demodulator 11, and the FM internal antenna 103 or the FM external antenna 301 can be selected to be used as needed. Alternatively, when the terminal device 100 is connected to the peripheral device 200, the second metal ground 23 in the peripheral device 200 and/or one of the target metal traces (GND2, Vcc2 or Data2) in the peripheral device 200 form the FM extension antenna 24 of the terminal device 100, and when the FM extension antenna 24 is connected to the FM built-in antenna 103 to form a FM combination antenna, the switch unit SW is used to select the FM demodulator 11 to be connected to the FM combination antenna and one of the headphone jack 19.

Among them, when the terminal device 100 is connected to the peripheral device 200, since the FM built-in antenna 103 in the terminal device 100 and the FM extended antenna 24 of the peripheral device 200 together form an FM combined antenna, the switch unit SW chooses to connect the FM demodulator 11 to the FM built-in antenna 103, which is equivalent to connecting the FM demodulator 11 to the FM combined antenna.

Therefore, in the present application, when the terminal device 100 is not connected to the peripheral device 200, the terminal device 100 may only include the FM built-in antenna 103, and the switch unit SW selects to connect the FM demodulator 11 to the FM built-in antenna 103, which means that the FM demodulator 11 is only connected to the FM built-in antenna 103. When the terminal device 100 is connected to the peripheral device 200, the second metal ground 23 in the peripheral device 200 and/or one of the target metal traces (GND2, Vcc2 or Data2) in the peripheral device 200 form the FM epitaxial antenna 24 of the terminal device, and the FM epitaxial antenna 24 is connected to the FM built-in antenna 103 to form a FM combined antenna, the switch unit SW selects to connect the FM demodulator 11 to the FM built-in antenna 103, which means that the FM demodulator 11 is connected to the FM epitaxial antenna 24 and the FM built-in antenna 103 to form a FM combined antenna.

In some embodiments, when the earphone 300 is connected to the earphone jack 19, the switch unit SW selects to connect the FM demodulator 11 to the earphone jack 19, so that the FM demodulator 11 is electrically connected to the earphone 300 and demodulates the FM signal received by the FM external antenna 301 into an audio signal; when the earphone 300 is not connected to the earphone jack 19, the switch unit SW selects to connect the FM demodulator 11 to the FM internal antenna 103, so that the FM demodulator 11 demodulates the FM signal received by the FM internal antenna 103 into an audio signal. For the terminal device 100 with a smaller size, the length of the FM external antenna 301 is usually longer than that of the FM internal antenna 103, and the FM signal reception effect is better. Therefore, when the earphone 300 is connected to the earphone 300, the FM signal received by the FM external antenna 301 is transmitted to the FM demodulator 11 by default. When the earphone 300 is not connected to the earphone 300, the FM signal received by the FM internal antenna 103 is transmitted to the FM demodulator 11 by default, so that the audio signal demodulated by the FM demodulator 11 has higher quality.

Among them, in some embodiments, when the terminal device 100 is not connected to the peripheral device 200, the terminal device 100 may only include the FM built-in antenna 103, and the FM signal received by the FM built-in antenna 103 is the FM signal received by the FM built-in antenna 103 alone. When the terminal device 100 is connected to the peripheral device 200, the second metal ground 23 in the peripheral device 200 and/or one of the target metal traces (GND2, Vcc2 or Data2) in the peripheral device 200 form the FM extension antenna 24 of the terminal device, and the FM extension antenna 24 is connected to the FM built-in antenna 103 to form a FM combination antenna, the FM signal received by the FM built-in antenna 103 is the FM signal received by the FM combination antenna formed by the connection of the FM built-in antenna 103 and the FM extension antenna 24.

In some embodiments, as shown in FIG6 , the switch unit SW includes a single-pole single-throw switch SW1, and the single-pole single-throw switch SW1 is connected between the FM built-in antenna 103 and the FM demodulator 11. When the earphone 300 is connected to the earphone port 19, the single-pole single-throw switch SW1 is disconnected; when the earphone 300 is not connected to the earphone 300, the single-pole single-throw switch SW1 is closed. Thus, the single-pole single-throw switch SW1 can be used to connect the FM demodulator 11 to the earphone port 19 when the earphone 300 is connected to the earphone port 19, and to connect the FM demodulator 11 to the FM built-in antenna 103 when the earphone 300 is not connected to the earphone port 19, and the structure is simple.

In some embodiments, the terminal device 100 further includes a signal amplifier 18 , and the switch unit SW may be disposed in the signal amplifier 18 .

In some other embodiments, as shown in FIG7 , the switch unit SW includes a first single-pole double-throw switch SW2, and the first single-pole double-throw switch SW2 is connected between the FM built-in antenna 103, the earphone port 19, and the FM demodulator 11. When the earphone 300 is connected to the earphone port 19, the first single-pole double-throw switch SW2 electrically connects the earphone port 19 with the FM demodulator 11; when the earphone 300 is not connected to the earphone 300, the first single-pole double-throw switch SW2 electrically connects the FM built-in antenna 103 with the FM demodulator 11. Thus, the first single-pole double-throw switch SW2 can realize that when the earphone 300 is connected to the earphone port 19, the FM demodulator 11 is connected to the earphone port 19, and when the earphone 300 is not connected to the earphone port 19, the FM demodulator 11 is connected to the FM built-in antenna 103, and the structure is simple.

In some embodiments, as shown in FIG. 7 , the first single-pole double-throw switch SW2 includes a fixed end 202a, two free ends 202b and a throwing end 202c, the fixed end 202a is connected to the FM demodulator 11, the two free ends 202b are respectively connected to the FM built-in antenna 103 and the headphone jack 19, one end of the throwing end 202c is freely connected to the fixed end 202a, and the other end can be selectively connected to one of the free ends 202b, thereby realizing the electrical connection between the headphone jack 19 and the FM demodulator 11 or the electrical connection between the FM built-in antenna 103 and the FM demodulator 11.

In some embodiments, as shown in FIG8 , the terminal device 100 further includes a detection module 34, the detection module 34 is connected to the FM demodulator 11, the detection module 34 is used to detect the audio signal demodulated by the FM demodulator 11 to detect the quality of the FM signal received by the FM internal antenna 103 and the quality of the FM signal received by the FM external antenna 301; the switch unit SW is used to select the connection of the FM demodulator 11 to the FM internal antenna 103 or the earphone port 19 according to the quality of the FM signal received by the FM internal antenna 103 and the quality of the FM signal received by the FM external antenna 301 detected by the detection module 34. Thus, the quality of the FM signal received by the FM internal antenna 103 and the FM external antenna 301 can be detected by the detection module 34, and the FM internal antenna 103 or the FM external antenna 301 with better signal quality can be selected to receive the FM signal, which can effectively improve the communication performance.

In some embodiments, the switch unit SW can pre-select to connect the FM demodulator 11 to the FM internal antenna 103 and the FM external antenna 301 respectively, so that the FM signals received by the FM internal antenna 103 and the FM external antenna 301 are respectively transmitted to the FM demodulator 11. Therefore, the detection module 34 can respectively detect the audio signal demodulated by the FM demodulator 11 from the FM signal received by the FM internal antenna 103 to detect the quality of the FM signal received by the FM internal antenna 103, and detect the audio signal demodulated by the FM demodulator 11 from the FM signal received by the FM external antenna 301 to detect the quality of the FM signal received by the FM external antenna 301. Then, the switch unit SW can finally select to connect the FM demodulator 11 to the FM internal antenna 103 or the FM external antenna 301 according to the quality of the FM signal received by the FM internal antenna 103 and the quality of the FM signal received by the FM external antenna 301 respectively detected by the detection module 34.

Among them, in the present application, when the terminal device 100 is not connected to the peripheral device 200, the terminal device 100 may only include the FM built-in antenna 103, and the detection module 34 detects the quality of the FM signal received by the FM built-in antenna 103, which means that the detection module 34 detects the FM signal received by the FM built-in antenna 103 alone. When the terminal device 100 is connected to the peripheral device 200, since the FM built-in antenna 103 in the terminal device 100 and the FM extension antenna 24 of the peripheral device 200 together form an FM combined antenna, the detection module 34 is connected to the FM built-in antenna 103. Therefore, at this time, the detection module 34 detects the quality of the FM signal received by the FM built-in antenna 103, which means that the detection module 34 detects the quality of the FM signal received by the FM combined antenna. The switch unit SW selects to connect the FM demodulator 11 to the FM internal antenna 103 when the quality of the FM signal received by the FM internal antenna 103 is higher than the quality of the FM signal received by the FM external antenna 301; and selects to connect the FM demodulator 11 to the earphone port 19 when the quality of the FM signal received by the FM external antenna 301 is higher than the quality of the FM signal received by the FM internal antenna 103. Thus, the FM signal transmitted to the FM demodulator 11 can be the FM signal with higher quality between the FM signal received by the FM internal antenna 103 and the FM signal received by the FM external antenna 301.

In some embodiments, as shown in FIG8 , the switch unit SW may include a first single-pole single-throw switch SW3 and a second single-pole single-throw switch SW4, wherein the first single-pole single-throw switch SW3 is connected between the FM internal antenna 103 and the FM demodulator 11, and the second single-pole single-throw switch SW4 is connected between the earphone port 19 and the FM demodulator 11. When the quality of the FM signal received by the FM internal antenna 103 is higher than the quality of the FM signal received by the FM external antenna 301, the first single-pole single-throw switch SW3 is closed, and the second single-pole single-throw switch SW4 is opened; when the quality of the FM signal received by the FM external antenna 301 is higher than the quality of the FM signal received by the FM internal antenna 103, the first single-pole single-throw switch SW3 is opened, and the second single-pole single-throw switch SW4 is closed. Thus, the FM signal with higher quality between the FM signal received by the FM internal antenna 103 and the FM signal received by the FM external antenna 301 is transmitted to the FM demodulator 11 through the first single-pole single-throw switch SW3 and the second single-pole single-throw switch SW4.

In some embodiments, when the switch unit SW includes a first single-pole single-throw switch SW3 and a second single-pole single-throw switch SW4, the switch unit SW pre-selects to connect the FM demodulator 11 to the FM internal antenna 103 and the FM external antenna 301, respectively, which can be achieved by the first single-pole single-throw switch SW3 and the second single-pole single-throw switch SW4 being in a conducting state, respectively. That is, when the first single-pole single-throw switch SW3 is in a conducting state, the conducting first single-pole single-throw switch SW3 connects the FM demodulator 11 to the FM internal antenna 103, and when the second single-pole single-throw switch SW4 is in a conducting state, the conducting second single-pole single-throw switch SW4 connects the FM demodulator 11 to the headphone port 19.

In some embodiments, the first single-pole single-throw switch SW3 is closed by default, that is, it is turned on, and the FM demodulator 11 is connected to the FM built-in antenna 103. As mentioned above, when the terminal device 100 is connected to the peripheral device 200, the FM built-in antenna 103 is connected to the FM extension antenna 24 to form a FM combination antenna. Therefore, the FM demodulator 11 is connected to the FM built-in antenna 103, that is, it is connected to the FM combination antenna. The detection module 34 detects the quality of the FM signal received by the FM built-in antenna 103 or the FM combination antenna. When it is detected that the earphone 300 is inserted into the earphone port 19, the first single-pole single-throw switch SW3 is disconnected, the second single-pole single-throw switch SW4 is closed, and the FM demodulator 11 is connected to the earphone port 19. The detection module 34 detects the quality of the FM signal received by the FM external antenna 301. When the first controller 25 determines that the quality of the FM signal received by the FM internal antenna 103 or the FM combined antenna is higher than the quality of the FM signal received by the FM external antenna 301, the first single-pole single-throw switch SW3 is controlled to be closed, the second single-pole single-throw switch SW4 is controlled to be disconnected, and the FM demodulator 11 is selected to be connected to the FM internal antenna 103; when the first controller 25 determines that the quality of the FM signal received by the FM external antenna 301 is higher than the quality of the FM signal received by the FM internal antenna 103 or the FM combined antenna, the first single-pole single-throw switch SW3 is controlled to be disconnected, the second single-pole single-throw switch SW4 is controlled to be closed, and the FM demodulator 11 is selected to be connected to the earphone port 19.

In some other embodiments, when it is detected that the earphone 300 is inserted into the earphone port 19, the second single-pole single-throw switch SW4 is closed by default, the FM demodulator 11 is connected to the earphone port 19, and the detection module 34 detects the quality of the FM signal received by the FM external antenna 301. When the quality of the FM signal received by the FM external antenna 301 is lower than a preset threshold, the first single-pole single-throw switch SW3 is closed, the second single-pole single-throw switch SW4 is disconnected, and the FM demodulator 11 is connected to the FM built-in antenna 103. The FM signal received by the FM built-in antenna 103 or the FM combined antenna is transmitted to the FM demodulator 11.

In some other embodiments, as shown in FIG9 , the switch unit SW includes a second single-pole double-throw switch SW5, and the second single-pole double-throw switch SW5 is connected between the FM demodulator 11, the FM internal antenna 103, and the earphone port 19. When the quality of the FM signal received by the FM internal antenna 103 or the FM combined antenna is higher than the quality of the FM signal received by the FM external antenna 301, the second single-pole double-throw switch SW5 electrically connects the FM internal antenna 103 with the FM demodulator 11; when the quality of the FM signal received by the FM external antenna 301 is higher than the quality of the FM signal received by the FM internal antenna 103 or the FM combined antenna, the second single-pole double-throw switch SW5 electrically connects the earphone port 19 with the FM demodulator 11. Thus, the FM signal with higher quality between the FM signal received by the FM internal antenna 103 or the FM combined antenna and the FM signal received by the FM external antenna 301 is transmitted to the FM demodulator 11 through the second single-pole double-throw switch SW5, and the structure is simple.

Among them, the structure of the second single-pole double-throw switch SW5 is the same as or similar to the structure of the first single-pole double-throw switch SW2, and the description of the structure of the first single-pole double-throw switch SW2 can be referred to, which will not be repeated here.

Among them, the function realized by the second single-pole double-throw switch SW5 is the same as that of the first single-pole single-throw switch SW3 and the second single-pole single-throw switch SW4, and can be replaced with the first single-pole single-throw switch SW3 and the second single-pole single-throw switch SW4. That is, in some embodiments, the second single-pole double-throw switch SW5 can be used to realize switching, and the first single-pole single-throw switch SW3 and the second single-pole single-throw switch SW4 can also be used to realize switching. Therefore, the second single-pole double-throw switch SW5 electrically connects the headphone port 19 with the FM demodulator 11 or electrically connects the FM built-in antenna 103 with the FM demodulator 11. The above-mentioned switch unit SW includes the conduction and closing logic of the first single-pole single-throw switch SW3 and the second single-pole single-throw switch SW4, which will not be repeated here.

In some embodiments, as shown in FIG2 , the playback unit 12 includes an audio power amplifier 121 and an audio output element 122. The audio power amplifier 121 is connected to the FM demodulator 11 and the audio output element 122. The audio power amplifier 121 is used to amplify the power of the audio signal demodulated by the FM demodulator 11, and the audio output element 122 is used to output audio. Thus, the audio output by the audio output element 122 can be less distorted and of better quality.

The audio output component 122 may be, but is not limited to, a speaker or a loudspeaker.

In some embodiments, as shown in Figure 2, the terminal device 100 also includes a first controller 25, which is connected between the audio power amplifier 121 and the FM demodulator 11. The first controller 25 can receive the audio signal demodulated by the FM demodulator 11 and control the audio power amplifier 121 to amplify the audio signal.

Among them, the first controller 25 can be a central processing unit (CPU), a general processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof.

In some embodiments, as shown in FIG2 , the terminal device 100 further includes a first power supply E1, one end of the first power line Vcc1 is connected to the first power supply E1, and the other end is connected to the first connection portion 21. As shown in FIG5 , the peripheral device 200 further includes a second power supply E2, one end of the second power line Vcc2 is connected to the second power supply E2, and the other end is connected to the second connection portion 22. When the first connection portion 21 is connected to the second connection portion 22, the first power supply E1 is connected to the second power supply E2. At this time, the first power supply E1 can charge the second power supply E2, or the second power supply E2 can charge the first power supply E1. Thus, when the external power supply (not indicated) can only charge the terminal device 100 or the peripheral device 200, both the terminal device 100 and the peripheral device 200 can be charged.

In some embodiments, as shown in Figure 2, one end of the first signal transmission line Data1 is connected to the first controller 25, and the other end is connected to the first connecting part 21. As shown in Figure 5, the peripheral device 200 includes a second controller 28, one end of the second signal transmission line Data2 is connected to the second controller 28, and the other end is connected to the second connecting part 22. When the first connecting part 21 is connected to the second connecting part 22, the first controller 25 and the second controller 28 can communicate through the first signal transmission line Data1 and the second signal transmission line Data2.

As shown in FIG10 , in some other embodiments, the first power line Vcc1 forms the FM built-in antenna 103. In some terminal devices 100 where the length of the first power line Vcc1 is closer to the optimal FM receiving antenna length than the lengths of other first metal traces and metal grounds, the first power line Vcc1 may also be selected to form the FM built-in antenna 103. When the first power line Vcc1 forms the FM built-in antenna 103, the FM demodulator 11 is connected to the first power line Vcc1.

As shown in Figure 10, in some other embodiments, when the first power line Vcc1 forms the FM built-in antenna 103, the anti-blocking FM filter 17 includes a first anti-blocking FM filter 171 and a second anti-blocking FM filter 172, the first pass FM filter 16 is arranged on the line where the first power line Vcc1 is located, the anti-blocking FM filter 17 includes a first anti-blocking FM filter 171 and a second anti-blocking FM filter 172, the first anti-blocking FM filter 171 is arranged on the line where the first ground line GND1 is located, and the second anti-blocking FM filter 172 is arranged on the line where the first signal transmission line Data1 is located.

As shown in Figure 10, in some other embodiments, the terminal device 100 also includes a third-blocking FM filter 173, and the third-blocking FM filter 173 is connected between the first power supply E1 and the first power line Vcc1. The third-blocking FM filter 173 is used to prevent the FM signal received by the FM built-in antenna 103 from flowing into the first power supply E1, and cannot be transmitted to the FM demodulator 11 or is attenuated.

As shown in FIG11 , in some other embodiments, the first signal transmission line Data1 forms the FM built-in antenna 103. In some terminal devices 100 where the length of the first signal transmission line Data1 is closer to the optimal FM receiving antenna length than the lengths of other first metal traces and metal grounds, the first power line Vcc1 may also be selected to form the FM built-in antenna 103. When the first signal transmission line Data1 forms the FM built-in antenna 103, the FM demodulator 11 is connected to the first signal transmission line Data1.

As shown in Figure 11, in some other embodiments, when the first signal transmission line Data1 forms the FM built-in antenna 103, the blocking FM filter 17 includes a first blocking FM filter 171 and a second blocking FM filter 172, the first pass FM filter 16 is arranged on the line where the first signal transmission line Data1 is located, the blocking FM filter 17 includes a first blocking FM filter 171 and a second blocking FM filter 172, the first blocking FM filter 171 is arranged on the line where the first ground line GND1 is located, and the second blocking FM filter 172 is arranged on the line where the first power line Vcc1 is located.

As shown in Figure 11, in some other embodiments, the terminal device 100 also includes a third-blocking FM filter 173, and the third-blocking FM filter 173 is connected between the first signal transmission line Data1 and the first controller 25. The third-blocking FM filter 173 is used to prevent the FM signal received by the FM built-in antenna 103 from flowing into the first controller 25, and cannot be transmitted to the FM demodulator 11 or attenuated.

In some embodiments, as shown in Figures 2 and 5, a peripheral device 200 includes a second connecting portion 22, and the second connecting portion 22 is used to connect to the first connecting portion 21 of the terminal device 100 in the aforementioned embodiment. When the second connecting portion 22 of the peripheral device 200 is connected to the first connecting portion 21 of the terminal device 100, at least part of the structure in the peripheral device 200 is used to form an FM extension antenna 24 of the terminal device 100, and the FM extension antenna 24 is connected to the FM built-in antenna 103 to form a FM combined antenna to receive FM signals.

Thus, when the peripheral device 200 is connected to a smaller terminal device 100, the FM extended antenna 24 of the peripheral device 200 and the FM built-in antenna 103 of the terminal device 100 together form the FM combined antenna, which can make the length of the FM combined antenna closer to the optimal length of the FM signal receiving antenna, thereby improving the reception effect of the FM signal.

In some embodiments, as shown in Figures 2 and 5, the peripheral device 200 includes a second metal ground 23 and at least one second metal trace 230 corresponding to the at least one first metal trace 101 in the terminal device 100, and the second connecting portion 22 includes at least one second electrical connector 220, and the at least one second electrical connector 220 is respectively connected one-to-one with the at least one second metal trace 230 in the peripheral device 200. When the second connection part 22 of the peripheral device 200 is connected to the first connection part 21 of the terminal device 100, the at least one second metal routing 230 in the peripheral device 200 is respectively connected to the at least one first metal routing 101 in the terminal device 100, and the second metal ground 23 in the peripheral device 200 and/or one of the target metal routings in the peripheral device 200 form an FM epitaxial antenna 24, and the FM epitaxial antenna 24 and the FM built-in antenna 103 together form an FM combined antenna to receive FM signals, wherein the target metal routing is a second metal routing corresponding to the first metal routing forming the FM built-in antenna 103 in the terminal device 100.

Thus, for the terminal device 100 with a smaller volume, when the second connecting part 22 of the peripheral device 200 is connected to the first connecting part 21 of the terminal device 100, the second metal routing in the peripheral device 200 corresponding to the first metal routing forming the FM built-in antenna 103 in the terminal device 100 forms a FM combined antenna together with the FM built-in antenna 103 to receive FM signals. For the terminal device 100 with a smaller volume, the length of the antenna for receiving FM signals can be made longer and closer to the optimal length of the FM signal receiving antenna, thereby achieving a better FM signal reception effect.

In some embodiments, as shown in Figure 5, the FM built-in antenna 103 is formed by the first ground line GND1 and the first metal ground 102 in the terminal device 100, and the peripheral device 200 also includes a first Bluetooth antenna 26 and a second pass FM filter 27, the second pass FM filter 27 is connected between the first Bluetooth antenna 26 and the second metal ground 23 of the peripheral device 200, the second metal ground 23 in the peripheral device 200, the second ground line GND2 in the peripheral device 200 and the first Bluetooth antenna 26 form the FM extension antenna 24, and when the peripheral device 200 is connected to the terminal device 100, the FM extension antenna 24 in the peripheral device 200 and the FM built-in antenna 103 in the terminal device 100 jointly form the FM combination antenna. Thus, when the peripheral device 200 is connected to the peripheral device 200, the first Bluetooth antenna 26, the second metal ground 23 of the peripheral device 200, the second ground wire GND2 of the peripheral device 200 and the FM built-in antenna 103 in the terminal device 100 together form the FM combined antenna. For the terminal device 100 with a smaller volume, the length of the antenna for receiving FM signals can be made longer, closer to the optimal length of the FM signal receiving antenna, and the FM signal reception effect is better.

In some embodiments, as shown in FIG5 , the peripheral device 200 includes a second controller 28 and a fourth-stop FM filter 29, the second controller 28 includes a Bluetooth module 280, and the fourth-stop FM filter 29 is connected between the first Bluetooth antenna 26 and the Bluetooth module 280. The Bluetooth module 280 can control the first Bluetooth antenna 26 to send and receive signals. Thus, it can be avoided that when the first Bluetooth antenna 26 participates in receiving the FM signal, the FM signal is transmitted to the Bluetooth module 280, thereby causing the FM signal transmitted to the FM demodulator 11 to be attenuated to an increased degree.

In some embodiments, the peripheral device 200 further includes a filter F, which is connected between the second controller 28 and the fourth-block FM filter 29 , and is used to filter the Bluetooth signal received and sent by the first Bluetooth antenna 26 .

In some embodiments, the terminal device 100 further includes a second Bluetooth antenna (not shown), and the terminal device 100 and the peripheral device 200 can communicate with each other via the first Bluetooth antenna 26 and the second Bluetooth antenna.

In some embodiments, as shown in FIG5 , the peripheral device 200 further includes a second circuit board 30, and the at least one second metal trace 230 and the second metal ground 23 are at least partially disposed on the second circuit board 30. The second circuit board 30 may be a flexible printed circuit (FPC), or a rigid printed circuit board (PCB), or a portion thereof may be a flexible circuit board and another portion thereof may be a rigid printed circuit board.

In some embodiments, as shown in FIG. 5 , the second circuit board 30 includes a second flexible circuit board 303 and a second main board 302 , wherein the second main board 302 is a rigid circuit board, and the second flexible circuit board 303 is connected to the second main board 302 .

In some embodiments, as shown in FIG5 , the second main board 302 and the second flexible circuit board 303 may be connected via a second connector 31. The second connector 31 may include a socket connector (not shown) and an elastic contact connector (not shown). The elastic contact connector is disposed on the second flexible circuit board 303, the socket connector is disposed on the second main board 302, and the pins or contact pieces of the elastic contact connector are inserted into the socket connector so that the second main board 302 or the second flexible circuit board 303 can achieve reliable electrical connection, wherein the elastic contact connector may be a flexible circuit board connector (FPC) or a flexible flat cable connector (FFC). In other embodiments, the second connector 31 may also be other types of connectors, not limited to the types exemplified above.

In which, when a second connector 31 is further provided between the second main board 302 and the second flexible circuit board 303, each of the at least one second metal trace 230 is divided into two sections, one of which is provided on the second flexible circuit board 303 and extends to the second connector 31, and the other section is provided on the second main board 302 and also extends to the second connector 31, and is connected into a whole metal trace through the second connector 31.

In some embodiments, the peripheral device 200 is a keyboard. Therefore, as shown in FIG. 5 , the peripheral device 200 may further include a key array 33 , wherein the key array 33 is connected to the second circuit board 30 , and the second metal ground 23 may be disposed on the key array 33 and the second circuit board 30 .

In some embodiments, as shown in FIG. 5 , the peripheral device 200 may further include a touch pad 32 , the touch pad 32 is connected to the second circuit board 30 , and the second metal ground 23 may be disposed on the touch pad 32 , the button array 33 and the second circuit board 30 .

In the aforementioned embodiments, the terms "first", "second", etc. are used to distinguish different objects rather than to describe a specific order. In addition, the terms "upper", "lower", "inner", "outer", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present application.

In the above embodiments, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components; it can be a communication connection; it can be an electrical connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

In the aforementioned embodiments, the description of each embodiment has its own emphasis. For the parts not described in detail in a certain embodiment, please refer to the relevant description of other embodiments. The various embodiments can also be adaptively combined into other new embodiments. Moreover, the embodiments described in this application are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

The above is an implementation method of the embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the embodiment of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims (21)

1. A terminal device, characterized in that the terminal device comprises a circuit board, an FM demodulator and a playing unit; the circuit board is provided with at least one metal wire and a first metal ground, wherein one metal wire and/or the first metal ground is/are used for forming an FM built-in antenna to receive FM signals; the FM demodulator is connected with the FM built-in antenna and the playing unit, and is used for demodulating an FM signal received by the FM built-in antenna into an audio signal and sending the audio signal to the playing unit for playing;

The terminal equipment further comprises a first connecting part, wherein the first connecting part is used for being connected with a second connecting part of peripheral equipment so as to be connected with the peripheral equipment, when the first connecting part of the terminal equipment is connected with the second connecting part of the peripheral equipment, at least part of structures in the peripheral equipment are used for forming an FM epitaxial antenna of the terminal equipment, and the FM epitaxial antenna and the FM built-in antenna are connected to jointly form an FM combined antenna so as to receive FM signals.

2. The terminal device of claim 1, wherein the at least one metal trace includes a ground line, a power line, and a signal transmission line.

3. The terminal device of claim 2, wherein the ground wire and the first metallic ground are used to form an FM internal antenna to receive FM signals.

4. The terminal device of claim 1, further comprising a first pass FM filter and a blocking FM filter, wherein the first pass FM filter is disposed between the FM internal antenna and the FM demodulator, and wherein the blocking FM filter is disposed on a line where other metal wires not forming the FM internal antenna are located.

5. The terminal device according to claim 1, further comprising a signal amplifier connected between the FM internal antenna and the FM demodulator, the signal amplifier being configured to amplify the FM signal received by the FM internal antenna and transmit the signal to the FM demodulator.

6. The terminal device according to claim 1, wherein the first connection portion includes at least one first electrical connector, the at least one first electrical connector being respectively connected in one-to-one correspondence with at least one metal trace in the terminal device, the peripheral device includes a second metal ground and at least one metal trace corresponding to the at least one metal trace in the terminal device, the second connection portion includes at least one second electrical connector, the at least one second electrical connector being respectively connected in one-to-one correspondence with at least one metal trace in the peripheral device; when the first connection part of the terminal equipment is connected with the second connection part of the peripheral equipment, the at least one metal wire in the peripheral equipment is connected with the at least one metal wire in the terminal equipment in a one-to-one correspondence mode, a second metal ground in the peripheral equipment and/or one target metal wire in the peripheral equipment form an FM epitaxial antenna of the terminal equipment, and the FM epitaxial antenna is connected with the FM built-in antenna to jointly form an FM combined antenna so as to receive FM signals, wherein the target metal wires are metal wires corresponding to metal wires forming an FM built-in antenna in the terminal equipment.

7. The terminal device of claim 1, wherein the first connection portion and the second connection portion are detachably connected.

8. The terminal device of claim 7, wherein the first connection portion is a POGPIN connector, and wherein the second connection portion is also a POGPIN connector.

9. The terminal device according to any of claims 1-8, further comprising a headset port, the headset port being connected to the FM demodulator and adapted to be connected to a headset, wherein at least part of the headset is configured to form an FM external antenna of the terminal device for receiving FM signals when the headset port is connected to the headset.

10. The terminal device according to claim 9, further comprising a switching unit for selecting one of the FM internal antenna and the earphone port to connect the FM demodulator.

11. The terminal device according to claim 10, wherein the switch unit selects to connect the FM demodulator to the earphone port when the earphone port is connected to the earphone, so that the FM demodulator is electrically connected to the earphone, and demodulates the FM signal received by the FM external antenna into an audio signal; the switch unit selectively connects the FM demodulator to the FM internal antenna when the earphone port is not connected with the earphone, so that the FM demodulator demodulates the FM signal received by the FM internal antenna into an audio signal.

12. The terminal device according to claim 11, wherein the switch unit includes a single pole single throw switch connected between the FM internal antenna and the FM demodulator, the single pole single throw switch being turned off when the earphone port is connected to an earphone; when the earphone port is not connected with the earphone, the single-pole single-throw switch is closed; or alternatively

The switch unit comprises a single-pole double-throw switch, the single-pole double-throw switch is connected among the FM built-in antenna, the earphone port and the FM demodulator, and when the earphone port is connected with an earphone, the single-pole double-throw switch electrically connects the earphone port with the FM demodulator; when the earphone port is not connected with the earphone, the single-pole double-throw switch electrically connects the FM internal antenna with the FM demodulator.

13. The terminal device according to claim 10, further comprising a detection module connected to the FM demodulator, the detection module being configured to detect a quality of an FM signal received by the FM internal antenna and a quality of an FM signal received by the FM external antenna by detecting an audio signal output by the FM demodulator demodulation; the switch unit is used for selectively connecting the FM demodulator to the FM internal antenna or the earphone port according to the quality of the FM signal received by the FM internal antenna and the quality of the FM signal received by the FM external antenna detected by the detection module.

14. The terminal device according to claim 13, wherein the switching unit selects to connect the FM demodulator to the FM internal antenna when the quality of the FM signal received by the FM internal antenna is higher than the quality of the FM signal received by the FM external antenna; and selecting to connect the FM demodulator to the earphone port when the quality of the FM signal received by the FM external antenna is higher than that of the FM signal received by the FM internal antenna.

15. The terminal device according to claim 14, wherein the switch unit includes a first single-pole single-throw switch connected between the FM internal antenna and the FM demodulator and a second single-pole single-throw switch connected between the earphone port and the FM demodulator, the first single-pole single-throw switch being closed when the quality of the FM signal received by the FM internal antenna is higher than the quality of the FM signal received by the FM external antenna, the second single-pole single-throw switch being open; when the quality of the FM signal received by the FM external antenna is higher than that of the FM signal received by the FM internal antenna, the first single-pole single-throw switch is opened, and the second single-pole single-throw switch is closed; or alternatively

The switch unit comprises a single-pole double-throw switch, the single-pole double-throw switch is connected among the FM demodulator, the FM internal antenna and the earphone port, and when the quality of an FM signal received by the FM internal antenna is higher than that of an FM signal received by the FM external antenna, the single-pole double-throw switch electrically connects the FM internal antenna with the FM demodulator; and when the quality of the FM signal received by the FM external antenna is higher than that of the FM signal received by the FM internal antenna, the single-pole double-throw switch electrically connects the earphone port with the FM demodulator.

16. The terminal device according to claim 1, wherein the playing unit includes an audio amplifier and an audio output member, the audio amplifier is connected to the FM demodulator and the audio output member, the audio amplifier is configured to amplify power of the audio signal demodulated by the FM demodulator, and the audio output member is configured to output audio.

17. A peripheral device comprising a second connection portion for connection with the first connection portion of the terminal device of any of claims 1-16, at least part of the structure of the peripheral device being adapted to form an FM extension antenna of the terminal device when the second connection portion of the peripheral device is connected with the first connection portion of the terminal device, the FM extension antenna being connected with the FM internal antenna to jointly form an FM combination antenna for receiving FM signals.

18. The peripheral device of claim 17, wherein the peripheral device comprises a second metal ground and at least one metal trace corresponding to the at least one metal trace in the terminal device, the second connection portion comprising at least one second electrical connection, the at least one second electrical connection being respectively connected in one-to-one correspondence with the at least one metal trace in the peripheral device;

When the second connection part of the peripheral equipment is connected with the first connection part of the terminal equipment, the at least one metal wire in the peripheral equipment is connected with the at least one metal wire in the terminal equipment in a one-to-one correspondence manner, at least the second metal ground in the peripheral equipment and/or one target metal wire in the peripheral equipment form an FM epitaxial antenna of the terminal equipment, and the FM epitaxial antenna is connected with an FM built-in antenna of the terminal equipment to jointly form an FM combined antenna so as to receive FM signals;

the target metal wire is a metal wire corresponding to the metal wire forming the FM built-in antenna in the terminal equipment, and the first connecting part comprises at least one first electric connecting piece which is respectively connected with at least one metal wire in the terminal equipment in a one-to-one correspondence manner.

19. The peripheral device of claim 18, wherein an FM internal antenna in the terminal device is formed by the first metal ground and a ground line of the terminal device, the peripheral device further comprising a bluetooth antenna and a second through FM filter connected between the bluetooth antenna and a second metal ground of the peripheral device, the second metal ground in the peripheral device, the ground line in the peripheral device, and the bluetooth antenna forming the FM extension antenna, the FM extension antenna in the peripheral device and the FM internal antenna in the terminal device together forming the FM combination antenna when the peripheral device is connected to the terminal device.

20. The peripheral device of claim 17, wherein the peripheral device is a keyboard.

21. A terminal system comprising a terminal device according to any one of claims 1-16 and a peripheral device according to any one of claims 17-20.