CN104753554A - Radio Frequency Devices and Wireless Communication Devices - Google Patents

Abstract

A radio frequency device and a wireless communication device are provided. The radio frequency device is used for a wireless communication device, and comprises: an antenna setting area; a ground component; the first antenna and the second antenna are arranged in the antenna setting area and are respectively used for receiving and transmitting the first wireless signal and the second wireless signal; the first antenna includes: a feeding plate having a feeding part; the first radiator is coupled with the feed plate, electrically connected with the grounding component and used for transmitting a first wireless signal; the first signal feed-in component is electrically connected with the feed-in part and used for transmitting the first wireless signal to the first radiator through the feed-in plate so as to transmit the first wireless signal through the first radiator; the metal support arm is electrically connected to the grounding component; the first antenna and the second antenna share a grounding component positioned between the first antenna and the second antenna, the feed-in plate is positioned between the metal support arm and the first radiating body, and the metal support arm is used for guiding a reflected signal of the second wireless signal to the metal support arm so as to improve the isolation degree of the antennas. The invention can increase the antenna efficiency and ensure the normal operation of wireless transmission.

Description

Radio Frequency Devices and Wireless Communication Devices

technical field

The present invention relates to a radio frequency device and a wireless communication device, in particular to a radio frequency device and a wireless communication device that can improve isolation to place multiple antennas in a limited space while maintaining antenna performance and bandwidth.

Background technique

Electronic products with wireless communication functions, such as notebook computers, personal digital assistants (Personal Digital Assistant), wireless base stations, mobile phones, smart meters (Smart Meter), USB wireless network cards (USB dongle), etc., transmit or receive radio through antennas waves to pass or exchange radio signals to access wireless networks. Therefore, in order to allow users to access wireless communication networks more conveniently, the bandwidth of an ideal antenna should be increased as much as possible within the allowable range, while the size should be reduced as much as possible to match the trend of shrinking electronic products. In addition, with the continuous evolution of wireless communication technology, the number of antennas configured on electronic products may increase. For example, in the design of USB wireless network cards, in order to allow users of related electronic products to simultaneously use different wireless communication systems (such as Bluetooth and WiFi) in the same frequency band to execute different applications, or to improve the spectral efficiency and In order to improve the transmission rate and improve the communication quality, the USB wireless network card needs to use multiple (or multiple groups) antennas to send and receive wireless signals synchronously, divide the space into many channels, and then provide multiple antenna patterns. Due to the use of multiple groups of antennas, the problem of mutual interference between antennas has become one of the key points to be considered during design.

In the design of wireless communication products, multiple groups of antennas are usually placed on the diagonal line of the wireless communication product or at the farthest position on the longest side to minimize the interference between multiple groups of antennas and achieve Best complementary antenna characteristics. However, when the overall size of the wireless communication product or the area where the antennas can be installed is small, it is necessary to consider the layout of multiple sets of antennas at the same time to avoid mutual interference between the antennas, thus increasing design difficulties.

In addition, with the technological advancement of wireless communication systems, broadband antennas have become one of the primary requirements of communication systems. Common broadband antennas, such as planar inverted F antennas, can achieve the purpose of transmitting and receiving multi-frequency wireless signals. However, the length of the radiator of this type of antenna is too long to be installed in a miniaturized wireless communication system, and the low-frequency bandwidth is insufficient. (about 110MHz), which cannot meet the needs of broadband communication systems.

Therefore, how to design multiple sets of antennas that meet the transmission requirements in a limited space while taking into account the bandwidth, efficiency, and isolation of each antenna has become one of the goals that the industry is striving for.

Therefore, it is necessary to provide a radio frequency device and a wireless communication device to meet the above requirements.

Contents of the invention

The present invention mainly provides a radio frequency device and a wireless communication device capable of improving antenna isolation, so as to place multiple antennas in a limited space and maintain antenna bandwidth and performance.

The invention discloses a radio frequency device, the radio frequency device is used for a wireless communication device, and the radio frequency device includes: an antenna setting area; a grounding component, the grounding component is used to provide grounding; a first antenna, the first antenna is set In the antenna setting area, used to send and receive a first wireless signal; and a second antenna, the second antenna is set in the antenna setting area, used to send and receive a second wireless signal; the first antenna includes: a a feed-in board, the feed-in board has a feed-in portion; a first radiator, the first radiator is coupled to the feed-in board, and is electrically connected to the grounding component, for transmitting the first wireless signal; A first signal feed-in component, the first signal feed-in component is electrically connected to the feed-in portion, and is used to transmit the first wireless signal to the first radiator through the feed-in board, so as to pass through the first radiation emit the first wireless signal; and a metal arm, the metal arm is electrically connected to the ground component; wherein, the ground component is located between the first antenna and the second antenna, the first antenna and the The second antenna shares the ground component, the feed-in plate is located between the metal arm and the first radiator, and the metal arm is used to guide a reflected signal of the second wireless signal to the metal arm, In order to improve the isolation between the first antenna and the second antenna.

The present invention also discloses a wireless communication device, the wireless communication device includes: a system grounding element, the system grounding element is used to provide grounding; a radio frequency signal processing module, the radio frequency signal processing module is used to process a plurality of wireless signals; and A radio frequency device, the radio frequency device includes: an antenna setting area, the radio frequency signal processing module is set in the center of the antenna setting area; a grounding component, the grounding component is electrically connected to the system grounding component; a first antenna, the first An antenna is set in the antenna setting area for sending and receiving a first wireless signal of the plurality of wireless signals; and a second antenna is set in the antenna setting area for sending and receiving the plurality of wireless signals A second wireless signal; the first antenna includes: a feed-in board, the feed-in board has a feed-in portion; a first radiator, the first radiator is coupled to the feed-in board, and electrically connected The grounding component is used to transmit the first wireless signal; a first signal feed-in component is electrically connected to the feed-in part, and is used to pass the first wireless signal through the feed-in board transmitted to the first radiator, so as to transmit the first wireless signal through the first radiator; and a metal arm, the metal arm is electrically connected to the ground component; wherein, the ground component is located at the first antenna and the second antenna, the first antenna and the second antenna share the ground component, the feed-in plate is located between the metal arm and the first radiator, and the metal arm is used to guide the second A reflected signal of the two wireless signals is sent to the metal support arm to improve the isolation between the first antenna and the second antenna.

The present invention increases the isolation between multiple antennas in a limited space by adding a metal support arm to guide the transmission signal and reflection signal of the antenna, so as to increase the efficiency of the antenna and ensure the normal operation of wireless transmission.

Description of drawings

FIG. 1 is a schematic diagram of a wireless communication device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a radio frequency device according to an embodiment of the present invention.

FIG. 3A is a schematic diagram of low-frequency current distribution of the radio frequency device of FIG. 2 .

FIG. 3B is a schematic diagram of high-frequency current distribution of the radio frequency device in FIG. 2 .

4A to 4C are schematic diagrams of VSWR of the radio frequency device of FIG. 2 .

5A to 5B are schematic diagrams of antenna isolation of the radio frequency device of FIG. 2 .

FIG. 6 is a schematic diagram of a radio frequency device according to an embodiment of the present invention.

7A to 7B are schematic diagrams of VSWR of the radio frequency device of FIG. 6 .

FIG. 8 is a schematic diagram of antenna isolation of the radio frequency device in FIG. 6 .

Description of main component symbols:

10 Wireless communication device

102 RF signal processing module

100, 20, 60 RF devices

200, 210, 220, 600, 610 Antenna

230, 630 Grounding components

250, 650 Antenna setting area

202, 602 Metal Arm

204, 212, 214, 222, 224, 604, 612, 614 radiators

206, 606 Feed-in board

207, 607 Feeding Department

216, 226, 616 Short circuit components

208, 218, 228, 608, 618 Signal feed-in components

D1, D2, D3 Direction

h1 Coupling distance

h2 distance

Detailed ways

Please refer to FIG. 1 , which is a schematic diagram of a wireless communication device 10 according to an embodiment of the present invention. The wireless communication device 10 can be any electronic product with a wireless communication function, such as a mobile phone, a computer system, a wireless access point device, a wireless base station, a USB wireless network card, etc., and it is briefly composed of a radio frequency device 100 and a radio frequency signal processing module 102 constituted. The radio frequency device 100 provides a wireless communication function of the wireless communication device 10. To be more precise, the radio frequency signal processing module 102 can support simultaneous transmission and reception of multiple wireless signals of the same frequency band, and the radio frequency device 100 can ensure isolation under this operation. The so-called "simultaneous transmission and reception of multiple wireless signals of the same frequency band" can be a wireless communication system that supports multiple input and multiple output communication technologies to simultaneously transmit and receive wireless signals, or different wireless communication systems that use the same frequency band (such as Bluetooth (Bluetooth) and Wi- Fi) Send and receive wireless signals at the same time.

Please refer to FIG. 2 , which is a schematic diagram of a radio frequency device 20 according to an embodiment of the present invention. The radio frequency device 20 can be applied to the radio frequency device 100 in FIG. 1 , and includes a first antenna 200 , a second antenna 210 , a third antenna 220 , a grounding component 230 and an antenna setting area 250 . The first antenna 200 , the second antenna 210 and the third antenna 220 are disposed in the antenna installation area 250 for simultaneously transmitting and receiving multiple wireless signals of the same frequency band. For example, the first antenna 200 can be used to send and receive signals of the Bluetooth communication system, and the second antenna 210 and the third antenna 220 can be used to send and receive signals of the WiFi communication system. The first antenna 200 includes a metal arm 202 , a first radiator 204 , a feeding board 206 and a signal feeding component 208 . The feed-in board 206 has a feed-in portion 207 . The signal feed-in component 208 is electrically connected to the feed-in part 207, and is used to transmit the wireless signal to the first radiator 204 through the feed-in board 206; the first radiator 204 is arranged on one side of the feed-in board 206, and is electrically connected to the The grounding component 230 is coupled to the feed-in board 206 , that is, it can generate a signal connection with the feed-in board 206 through coupling, so as to receive the wireless signal fed in by the feed-in board 206 , and then transmit the wireless signal. Relative to the first radiator 204, the other side of the feed-in board 206 is provided with a metal arm 202, and a distance h2 between the metal arm 202 and the feed-in portion 207 is generally less than or equal to 5mm, which is also electrically connected to the grounding component 230. The lengths of the first radiator 204 and the metal arm 202 are roughly a quarter wavelength of a working frequency, but the lengths of the two need not be equal. In the embodiment of FIG. 2 , the metal arm 202 is substantially parallel to the first radiator 204 , but it is not limited thereto. In other embodiments, the metal arm 202 may not be parallel to the first radiator 204 . The shortest distance between the metal arm 202 and the first radiator 204 needs to be greater than a certain value. For example, in a Bluetooth or Wi-Fi system, the shortest distance between the metal arm 202 and the first radiator 204 needs to be approximately It is greater than or equal to 15mm. Of course, in systems with different frequencies, the shortest distance between the metal support arm 202 and the first radiator 204 can be adjusted appropriately. In this case, the metal support arm 202 can guide a reflected signal of the wireless signal generated by the second antenna 210 and the third antenna 220 to the metal support arm 202, so as to improve the isolation between the antennas 200, 210, 220 degree, thereby achieving good antenna efficiency.

In detail, the second antenna 210 and the third antenna 220 are disposed on the same substrate as the first antenna 200 and share the ground component 230 to connect to a system ground of the wireless communication device 10 . The radio frequency signal processing module 102 is arranged in the center of the antenna setting area 250, the first antenna 200 is generally set at one end of the antenna setting area 250, the second antenna 210 and the third antenna 220 are generally set on the first radiator 204 and the metal support. The other end of the antenna installation area 250 in the extending direction D1 of the arm 202 . The second antenna 210 includes a second radiator 212, a third radiator 214, a short circuit component 216 and a signal feed component 218, and the third antenna 220 includes a fourth radiator 222, a fifth radiator 224 , a short circuit component 226 and a signal feed component 228 . As shown in FIG. 2 , the antenna form of the second antenna 210 and the third antenna 220 is similar to that of a planar inverted F-shaped antenna plus a ground point (short-circuit elements 216, 226), but it is not limited thereto, and other forms of antennas also have similar features. Effect. The second radiator 212 and the fourth radiator 222 are used to excite lower frequency modes, while the third radiator 214 and fifth radiator 224 are used to excite higher frequency modes. 3A and 3B show the current distribution when the first antenna 200 , the second antenna 210 and the third antenna 220 operate simultaneously. FIG. 3A shows the low-frequency current distribution, and FIG. 3B shows the high-frequency current distribution. Since the second antenna 210 is opposite to the third antenna 220, the current directions D2 and D3 generated by the wireless signal on the second antenna 210 and the third antenna 220 (such as on the short-circuit components 216 and 226) are opposite, so the second There is good antenna isolation between the antenna 210 and the third antenna 220 . In addition, the metal arm 202 can guide the reflected signals generated by the second antenna 210 and the third antenna 220 to the metal arm 202 without disturbing the first antenna 200, so as to enhance the first antenna 200 and the second antenna 210 and The isolation between the third antennas 220 . In addition, the metal support arm 202 can also guide most of the resonant current in the first antenna 200 to flow into the first radiator 204 , thus ensuring good performance of the first antenna 200 .

Further, FIG. 4A is a schematic diagram of the voltage standing wave ratio (Voltage Standing Wave Ratio, VSWR) of the first antenna 200, FIG. 4B is a schematic diagram of the voltage standing wave ratio of the second antenna 210, and FIG. 4C is a voltage standing wave of the third antenna 220 Compared with the schematic diagrams, FIG. 5A is a schematic diagram of antenna isolation between the first antenna 200 and the second antenna 210 , and FIG. 5B is a schematic diagram of antenna isolation between the first antenna 200 and the third antenna 220 . As shown in FIG. 4A to FIG. 5B , the first antenna 200 , the second antenna 210 and the third antenna 220 have good bandwidth, and the isolation between the antennas can reach about -25 dB.

It should be noted that the present invention utilizes the metal support arm 202 to guide most of the resonant current in the first antenna 200 to flow into the first radiator 204, and makes the reflected current of other antennas flow to the metal support arm 202 without disturbing The first radiator 204 is used to ensure that the antenna has good bandwidth, efficiency and isolation, and those skilled in the art can make various modifications accordingly, without being limited thereto. For example, the wireless signal generated by the first antenna 200 is fed into the first radiator 204 through the feeding board 206 in a coupling manner, and the coupling distance h1 can be properly adjusted, but not limited thereto. The first antenna 200 can also be properly modified so that the wireless signal can be fed into the first radiator 204 in other feeding ways. In addition, the metal arm 202, the first radiator 204, the feed-in plate 206, the second radiator 212, the third radiator 214, the fourth radiator 222, the fifth radiator 224, etc. can all be selected according to different design requirements. , Y, and Z axis directions extend or change, and are not limited to the shape in FIG. 1 . The short-circuit components 216, 226 are used to connect the radiators 212, 222 and the ground component 230 to adjust the impedance matching of the antenna. Therefore, the form of the short-circuit components 216, 226 can be appropriately adjusted according to the overall matching and bandwidth of the antenna, and there is no limit to its shape. . Furthermore, the substrate used for setting the radio frequency device 20 may be a printed circuit board (Printed Circuit Board, PCB), or a substrate of other materials.

Please refer to FIG. 6 , which is a schematic diagram of a radio frequency device 60 according to another embodiment of the present invention. The radio frequency device 60 is similar to the radio frequency device 20 except that the radio frequency device 60 is used for two antennas, so only the first antenna 600 and the second antenna 610 are set in the antenna setting area 650 . The first antenna 600 is similar to the first antenna 200 , the main difference lies in the shape and width of the metal arm 602 . Since the shortest distance between the metal arm 602 and the first radiator 604 is greater than a certain value, the effect of the present invention can be achieved, so the shape and width of the metal arm 602 can be adjusted according to requirements without affecting the metal arm 602. function. That is to say, the metal support arm 602 can also guide most of the resonant current in the first antenna 600 to flow into the first radiator 604, and make the reflected current of other antennas (namely, the second antenna 610) flow to the metal support arm. The arm 602 does not interfere with the first radiator 604 to ensure that the antenna has good bandwidth, efficiency and isolation. 7A is a schematic diagram of VSWR of the first antenna 600 , FIG. 7B is a schematic diagram of VSWR of the second antenna 610 , and FIG. 8 is a schematic diagram of antenna isolation between the first antenna 600 and the second antenna 610 . As shown in FIGS. 7A to 8 , the first antenna 600 and the second antenna 610 have good bandwidth, and the isolation between the antennas can reach about -25dB.

In addition, the first radiator 604 of the first antenna 600 is used to excite lower frequency modes, and the feeding plate 606 can also be used as a high frequency radiator to excite higher frequency modes depending on the application. The short circuit component 616 connects the second radiator 612, a third radiator 614 and the ground component 630 of the second antenna 610 to adjust the impedance matching of the antenna. Therefore, the form of the short circuit component 616 can be appropriately adjusted depending on the overall matching and bandwidth of the antenna. , and its shape is not limited. In addition to the above, related modifications and changes of the radio frequency device 20 can be applied to the radio frequency device 60 without limitation.

In addition, as is well known in the industry, the radiation frequency, bandwidth, and efficiency of the antenna are related to the shape and material of the antenna. Therefore, the designer should be able to properly adjust the X, Y, and The size, width, spacing, etc. in the Z-axis direction meet the needs of the system. Others such as material, manufacturing method, shape and position of each component can be appropriately changed according to different needs, and are not limited thereto.

To sum up, the present invention increases the isolation between multiple antennas in a limited space by adding metal arms to guide the transmission and reflection signals of the antenna, thereby increasing the antenna efficiency and ensuring the normal wireless transmission operate.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the claims of the present invention shall fall within the scope of the present invention.

Claims (18)

1. A radio frequency device, the radio frequency device is used for a wireless communication device, the radio frequency device comprises: An antenna setting area; a grounding assembly for providing grounding; A first antenna, the first antenna is arranged in the antenna installation area, and is used to send and receive a first wireless signal, the first antenna includes: a feed-in board, the feed-in board has a feed-in portion; A first radiator, the first radiator is coupled to the feed-in board and electrically connected to the ground component, for transmitting the first wireless signal; A first signal feed-in component, the first signal feed-in component is electrically connected to the feed-in portion, and is used to transmit the first wireless signal to the first radiator through the feed-in board, so as to pass through the first radiation emit the first wireless signal; and a metal arm electrically connected to the ground component; and a second antenna, the second antenna is arranged in the antenna installation area, and is used to send and receive a second wireless signal; Wherein, the ground component is located between the first antenna and the second antenna, the first antenna and the second antenna share the ground component, the feed-in plate is located between the metal arm and the first radiator, The metal arm is used to guide a reflected signal of the second wireless signal to the metal arm, so as to improve the isolation between the first antenna and the second antenna. 2. The radio frequency device as claimed in claim 1, wherein the first wireless signal is fed into the first radiator by the feeding board in a coupling manner. 3. The radio frequency device as claimed in claim 1, wherein the second antenna comprises: a second radiator; a third radiator, the third radiator is electrically connected to the ground component; A second signal feed-in component, the second signal feed-in component is electrically connected to the second radiator, and is used to transmit the second wireless signal to the second radiator, so as to emit the second wireless signal through the second radiator a second wireless signal; and A first short circuit component is electrically connected between the second radiator and the ground component. 4. The radio frequency device according to claim 1, wherein the radio frequency device further comprises a third antenna, the third antenna is arranged in the antenna setting area, and is used to send and receive a third wireless signal, the third antenna comprises: a fourth radiator; a fifth radiator, the fifth radiator is electrically connected to the ground component; A third signal feed-in component, the third signal feed-in component is electrically connected to the fourth radiator, and is used to transmit the third wireless signal to the fourth radiator, so as to transmit the wireless signal through the fourth radiator a third wireless signal; and A second short circuit component is electrically connected between the fourth radiator and the ground component. 5. The radio frequency device as claimed in claim 4, wherein the direction of the current generated by the second wireless signal on the first short-circuit component is opposite to the direction of the current generated by the third wireless signal on the second short-circuit component. 6. The radio frequency device as claimed in claim 1, wherein a radio frequency signal processing module of the wireless communication device is disposed on the antenna installation area, between the first antenna and the second antenna. 7. The radio frequency device as claimed in claim 1, wherein the metal arm is substantially parallel to the first radiator. 8. The radio frequency device as claimed in claim 1, wherein a distance between the metal support arm and the feed-in portion is substantially less than or equal to 5 mm. 9. The radio frequency device as claimed in claim 1, wherein a shortest distance between the metal arm and the first radiator is substantially greater than or equal to 15 mm. 10. A wireless communication device, the wireless communication device comprising: a system grounding piece for providing grounding; A radio frequency signal processing module, the radio frequency signal processing module is used to process a plurality of wireless signals; and A radio frequency device, the radio frequency device includes: An antenna setting area, the radio frequency signal processing module is set in the center of the antenna setting area; a grounding component electrically connected to the system ground; A first antenna, the first antenna is arranged in the antenna installation area, and is used to send and receive a first wireless signal of the plurality of wireless signals, the first antenna includes: a feed-in board, the feed-in board has a feed-in portion; A first radiator, the first radiator is coupled to the feed-in board and electrically connected to the ground component, for transmitting the first wireless signal; A first signal feed-in component, the first signal feed-in component is electrically connected to the feed-in portion, and is used to transmit the first wireless signal to the first radiator through the feed-in board, so as to pass through the first radiation emit the first wireless signal; and a metal arm electrically connected to the ground component; and a second antenna, the second antenna is arranged in the antenna installation area, and is used to send and receive a second wireless signal of the plurality of wireless signals; Wherein, the ground component is located between the first antenna and the second antenna, the first antenna and the second antenna share the ground component, the feed-in plate is located between the metal arm and the first radiator, The metal arm is used to guide a reflected signal of the second wireless signal to the metal arm, so as to improve the isolation between the first antenna and the second antenna. 11. The wireless communication device as claimed in claim 10, wherein the first wireless signal is fed into the first radiator by the feeding board in a coupling manner. 12. The wireless communication device as claimed in claim 10, wherein the second antenna comprises: a second radiator; a third radiator, the third radiator is electrically connected to the ground component; A second signal feed-in component, the second signal feed-in component is electrically connected to the second radiator, and is used to transmit the second wireless signal to the second radiator, so as to emit the second wireless signal through the second radiator a second wireless signal; and A first short circuit component is electrically connected between the second radiator and the ground component. 13. The wireless communication device as claimed in claim 10, wherein the radio frequency device further comprises a third antenna, the third antenna is arranged in the antenna setting area, and is used to send and receive a third wireless signal, the third antenna comprises : a fourth radiator; a fifth radiator, the fifth radiator is electrically connected to the ground component; A third signal feed-in component, the third signal feed-in component is electrically connected to the fourth radiator, and is used to transmit the third wireless signal to the fourth radiator, so as to transmit the wireless signal through the fourth radiator a third wireless signal; and A second short circuit component is electrically connected between the fourth radiator and the ground component. 14. The wireless communication device as claimed in claim 13, wherein the direction of the current generated by the second wireless signal on the first short-circuit component is opposite to the direction of the current generated by the third wireless signal on the second short-circuit component. 15. The wireless communication device as claimed in claim 10, wherein the radio frequency signal processing module is disposed on the antenna installation area, between the first antenna and the second antenna. 16. The wireless communication device as claimed in claim 10, wherein the metal arm is substantially parallel to the first radiator. 17. The wireless communication device as claimed in claim 10, wherein a distance between the metal support arm and the feeding part is substantially less than or equal to 5 mm. 18. The wireless communication device as claimed in claim 10, wherein a shortest distance between the metal arm and the first radiator is substantially greater than or equal to 15 mm.