CN105514624B - A kind of mobile terminal antenna system and mobile terminal - Google Patents

Abstract

The invention discloses a mobile terminal antenna system and the mobile terminal, wherein the antenna system includes a metal frame of the mobile terminal, an NFC feed source, a first matching circuit, a diversity antenna feed source, a second matching circuit, a zeroth inductance and a reference ground; There are at least two gaps on the metal frame, and the metal frame between any adjacent gaps is the first metal frame; the NFC feed is connected to the first metal frame through the first matching circuit; the diversity antenna feed is passed through the second matching circuit Connected to the first metal frame; one end of the zeroth inductance is connected to the first metal frame, and the other end is connected to the reference ground; the NFC feed source, the first matching circuit, the first metal frame, the zeroth inductance and the reference ground form an NFC antenna system; diversity The antenna feed source, the second matching circuit and the first metal frame form a diversity antenna system; the NFC antenna system and the diversity antenna system share the first metal frame as the antenna radiator; the invention solves the problem that the built-in antenna of the mobile terminal takes up a lot of space and the antenna cost high question.

Description

A mobile terminal antenna system and mobile terminal

technical field

The present invention relates to the technical field of mobile terminals, in particular to a mobile terminal antenna system and a mobile terminal.

Background technique

At present, smart mobile terminals are generally designed with a near field communication (Near Field Communication, NFC) function, and accordingly, an NFC antenna is required to implement the NFC function. NFC is an extremely short-range radio frequency identification communication protocol technical standard. NFC technology is mainly based on radio frequency technology operating at a frequency of 13.56MHz. Its transmission range is small, but transmission is fast and energy consumption is low.

In a smart mobile terminal, multiple antennas such as a Global Positioning System (GPS) antenna, a Wireless Fidelity (WiFi) antenna, a diversity antenna, and a main antenna are often provided. The NFC antenna is built into the motherboard of the mobile terminal in the form of a chip, and the NFC antenna is designed separately from other antennas, which takes up a lot of space, which not only makes the design of the terminal smaller and smaller in size more and more difficult, but also increases Antenna cost.

Contents of the invention

In view of this, the object of the present invention is to propose a mobile terminal antenna system and a mobile terminal to solve the problem that the built-in antenna of the mobile terminal takes up a lot of space and the cost of the antenna is high, save the space of the mobile terminal, and facilitate the miniaturization design of the mobile terminal .

To achieve the above object, the present invention adopts the following technical solutions:

On the one hand, an embodiment of the present invention provides a mobile terminal antenna system, including a metal frame of the mobile terminal, a near-field communication NFC feed, a first matching circuit, a diversity antenna feed, a second matching circuit, a zeroth inductance, and a reference ground; there are at least two slits on the metal frame, wherein the metal frame between any adjacent slits is used as the first metal frame;

The NFC feed is connected to the first metal frame through the first matching circuit; the diversity antenna feed is connected to the first metal frame through the second matching circuit; one end of the zeroth inductance It is connected to the first metal frame, and the other end is connected to the reference ground; the NFC feed, the first matching circuit, the first metal frame, the zeroth inductance and the reference ground form an NFC antenna system; the diversity antenna feed, the first Two matching circuits and the first metal frame form a diversity antenna system; the NFC antenna system and the diversity antenna system share the first metal frame as an antenna radiator;

The first matching circuit is used to match the resonant frequency of the NFC antenna; the second matching circuit is used to widen the bandwidth of the diversity antenna; the zeroth inductance is used to increase the radiation power of the NFC antenna and filter out high-frequency signals.

On the other hand, an embodiment of the present invention provides a mobile terminal, including the mobile terminal antenna system in the above aspect.

The beneficial effect of the present invention is: a kind of mobile terminal antenna system and mobile terminal provided by the present invention, open the slit on the metal frame, divide the metal frame into at least two sections, select one of them as the first metal frame, pass the NFC feed through The first matching circuit is connected to the first metal frame, and the diversity antenna feed is connected to the first metal frame through the second matching circuit at the same time, so that the NFC antenna system and the diversity antenna system share the first metal frame as the antenna radiator, It solves the problem that the antenna is built into the mobile terminal in the form of a patch in the prior art and takes up a lot of space. At the same time, the NFC antenna and the diversity antenna share a metal frame, which not only saves the space of the mobile terminal, but also facilitates the miniaturization of the mobile terminal. design, and reduces antenna cost.

Description of drawings

Exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that those of ordinary skill in the art will be more aware of the above-mentioned and other features and advantages of the present invention. In the accompanying drawings:

FIG. 1 is a schematic structural diagram of a mobile terminal antenna system provided by Embodiment 1 of the present invention;

FIG. 2 is a perspective view of a metal frame of a mobile terminal provided by Embodiment 1 of the present invention;

FIG. 3 is a schematic diagram of an equivalent structure of an NFC antenna system provided by Embodiment 1 of the present invention;

FIG. 4 is a schematic diagram of an equivalent structure of a diversity antenna system provided by Embodiment 1 of the present invention;

FIG. 5 is a schematic structural diagram of a first matching circuit provided by Embodiment 1 of the present invention;

FIG. 6 is a schematic structural diagram of a second matching circuit provided by Embodiment 1 of the present invention;

FIG. 7 is a schematic structural diagram of a mobile terminal antenna system provided by Embodiment 2 of the present invention;

FIG. 8 is a plan view of a metal frame of a mobile terminal provided by Embodiment 2 of the present invention.

Detailed ways

The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.

Embodiment one

The mobile terminal antenna system provided in this embodiment can be used in various mobile terminals. For example, the mobile terminal can include user equipment that communicates with one or more core networks via the radio access network RAN, and the user equipment can be Mobile telephones ("cellular" telephones), computers with mobile terminals, etc., e.g. user equipment can also be portable, pocket, hand-held, computer built-in or vehicle-mounted mobile devices that exchange voice and/or or data. For another example, the mobile terminal may include a mobile phone, a tablet computer, a personal digital assistant PDA, a sales terminal POS, or a vehicle-mounted computer.

FIG. 1 is a schematic structural diagram of an antenna system for a mobile terminal provided in Embodiment 1 of the present invention; FIG. 2 is a perspective view of a metal frame of a mobile terminal provided in Embodiment 1 of the present invention. As shown in Figure 1, the mobile terminal antenna system includes a metal frame 1 of the mobile terminal, an NFC feed 2, a first matching circuit 3, a diversity antenna feed 4, a second matching circuit 5, a zeroth inductance 6 and a reference ground 7 ; There are at least two gaps 8 on the above metal frame 1, and the metal frame between any adjacent gaps 8 is used as the first metal frame 9; each gap 8 can be filled with plastic to connect each segment of the metal frame.

Among them, the NFC feed 2 is connected to the first metal frame 9 through the first matching circuit 3; the diversity antenna feed 4 is connected to the first metal frame 9 through the second matching circuit 5; one end of the zeroth inductance 6 is connected to the first metal frame 9 connection, the other end is connected to the reference ground 7; NFC feed 2, the first matching circuit 3, the first metal frame 9, the zeroth inductance 6 and the reference ground 7 form an NFC antenna system; diversity antenna feed 4, the second matching circuit 5 and the first metal frame 9 form a diversity antenna system; the NFC antenna system and the diversity antenna system share the first metal frame 9 as an antenna radiator.

In this embodiment, the first matching circuit 3 is used to match the resonant frequency of the NFC antenna; the second matching circuit 5 is used to widen the bandwidth of the diversity antenna; the zeroth inductance 6 is used to improve the radiation power of the NFC antenna and filter out high-frequency signals .

Specifically, when the NFC antenna is working, its equivalent circuit is shown in Figure 3, the dotted arrow indicates the equivalent current path, the zeroth inductance 6 in Figure 1 is equivalent to a short circuit state for the NFC signal, and the NFC feed 2, The first matching circuit 3, the first metal frame 9, the zeroth inductance 6 and the reference ground 7 form a loop-shaped Loop antenna; when the diversity antenna is working, its equivalent circuit is shown in Figure 4, and the dotted arrow indicates the equivalent current path, as shown in Figure 4. The zeroth inductance 6 in 1 is equivalent to an open circuit state for the diversity signal, and the diversity antenna feed 4, the second matching circuit 5 and the first metal frame 9 form a monopole antenna. In addition, after debugging, when the receiving and receiving effect of the diversity antenna is not good, a grounded inductor can be connected in parallel between the diversity antenna feed 4 and the second matching circuit 5 to match the input impedance of the diversity antenna.

Exemplarily, referring to FIG. 5 , the first matching circuit 3 of this embodiment may include a first capacitor C1 and a first inductor L1; wherein, one end of the first capacitor C1 is connected to one end of the first inductor L1 and then connected to the first metal The frame 9 is connected, the other end of the first capacitor C1 is connected to the NFC feed 2 , and the other end of the first inductor L1 is connected to the reference ground 7 . After debugging, setting appropriate values of C1 and L1 can make the resonant frequency of the NFC antenna at 13.56MHz, which meets the operating frequency of the NFC antenna.

Referring to FIG. 6, the second matching circuit 5 may include a second capacitor C2 and a second inductor L2; wherein, one end of the second capacitor C2 is connected to one end of the second inductor L2 and then connected to the first metal frame 9, and the second inductor L2 The other end of the second capacitor C2 is connected to the diversity antenna feed 4 , and the other end of the second capacitor C2 is connected to the reference ground 7 . Setting proper values of C2 and L2 can expand the bandwidth of the diversity antenna and adapt to the working frequency band of the diversity antenna.

In the mobile terminal antenna system provided by Embodiment 1 of the present invention, a slit is opened on the metal frame, and the metal frame is divided into at least two sections, one of which is selected as the first metal frame, and the NFC feed is connected to the first metal frame through the first matching circuit. The frame is connected, and the diversity antenna feed is connected to the first metal frame through the second matching circuit at the same time, so that the NFC antenna system and the diversity antenna system share the first metal frame as the antenna radiator, which solves the problem of antennas in the prior art. The NFC antenna and the diversity antenna share a metal frame, which not only saves the space of the mobile terminal, facilitates the miniaturization design of the mobile terminal, but also reduces the cost of the antenna.

Embodiment two

Fig. 7 is a schematic structural diagram of the mobile terminal antenna system provided by Embodiment 2 of the present invention. The difference from Embodiment 1 is that there are four slits on the metal frame in this embodiment, and the metal frame is divided into four sections. The metal frame and different antenna modules form antenna structures with different functions. As shown in Figure 7, the mobile terminal antenna system includes a metal frame of the mobile terminal, an NFC feed 2, a first matching circuit 3, a diversity antenna feed 4, a second matching circuit 5, a zeroth inductance 6 and a reference ground 7; There are four slits 8 on the metal frame, and the metal frame is divided into the first metal frame 9, the second metal frame 10, the third metal frame 11 and the fourth metal frame 12; each gap 8 can be filled with plastic to connect Sectional metal frame.

Among them, the NFC feed 2 is connected to the first metal frame 9 through the first matching circuit 3; the diversity antenna feed 4 is connected to the first metal frame 9 through the second matching circuit 5; one end of the zeroth inductance 6 is connected to the first metal frame 9, the other end is connected to the reference ground 7; the WiFi feed 13 is connected to one end of the second metal frame 10 through the third matching circuit 14; the GPS feed 15 is connected to one end of the fourth metal frame 12 through the fourth matching circuit 16; The main antenna feed 17 is connected to the third metal frame 11 through the fifth matching circuit 18; the preset positions of the second metal frame 10 and the fourth metal frame 12 are connected to the reference ground 7; the connection points of each matching circuit and the corresponding metal frame form a Feed point; NFC feed source 2, first matching circuit 3, first metal frame 9, zeroth inductance 6 and reference ground 7 form an NFC antenna system; diversity antenna feed source 4, second matching circuit 5 and first metal frame 9 form a diversity antenna system; the NFC antenna system and the diversity antenna system share the first metal frame 9 as an antenna radiator; the WiFi feed source 13, the third matching circuit 14, the WiFi feed point to the reference ground 7 on the second metal frame 10 The second metal frame between and the reference ground 7 form a WiFi antenna system; the fourth metal frame between the GPS feed source 15, the fourth matching circuit 16, the GPS feed point and the reference ground 7 on the fourth metal frame 12 and the reference ground 7 forms a GPS antenna system; the main antenna feed 17, the fifth matching circuit 18 and the third metal frame 11 form the main antenna system.

In this embodiment, the first matching circuit 3 is used to match the resonant frequency of the NFC antenna; the second matching circuit 5 is used to widen the bandwidth of the diversity antenna; the zeroth inductance 6 is used to improve the radiation power of the NFC antenna and filter out high-frequency signals ; The third matching circuit 14 is used to widen the bandwidth of the WiFi antenna, the fourth matching circuit 16 is used to widen the bandwidth of the GPS antenna, and the fifth matching circuit 18 is used to widen the bandwidth of the main antenna; Wherein, the third matching circuit 14, the fourth The circuit structure of the matching circuit 16 and the fifth matching circuit 18 can be the same as that of the second matching circuit 5 , and different capacitance and inductance parameters can be set to realize the expansion of different antenna bandwidths. In this embodiment, the second metal frame 10 is the radiator of the WiFi antenna, the third metal frame 11 is the radiator of the main antenna, and the fourth metal frame 12 is the radiator of the GPS antenna.

Exemplarily, among the above-mentioned four slits 8, two slits may be located on the upper metal frame of the mobile terminal, and the first metal frame 9 is between the two slits; the other two slits may be located on the lower metal frame of the mobile terminal, and in addition Between the two gaps is a third metal frame 11 . In addition, the WiFi feed point and GPS feed point are located on the upper metal frame.

Referring to FIG. 8 , the above reference ground 7 can be set on the main board of the mobile terminal, and the shaded part in FIG. 8 is the reference ground. The preset positions of the second metal frame 10 and the fourth metal frame 12 are the section where the second metal frame 10 and the fourth metal frame 12 are in contact with the shaded part.

Further, the main board of the mobile terminal inside the upper and lower metal frames is provided with a clearance area 19 for keeping the first metal frame 9 and the third metal frame 11 away from the reference ground 7 to improve communication quality. The clear area refers to the area where no reference ground is arranged.

In this embodiment, the equivalent circuits of the NFC antenna and the diversity antenna are the same as those in Embodiment 1, and will not be repeated here. Referring to Fig. 7, when the WiFi antenna is working, the dotted arrow on the right indicates its equivalent current path, the second metal between the WiFi feed source 13, the third matching circuit 14, the WiFi feed point and the reference ground 7 on the second metal frame 10 The frame and the reference ground 7 form a Loop antenna; when the GPS antenna is working, the left dotted arrow indicates its equivalent current path, between the GPS feed source 15, the fourth matching circuit 16, and the GPS feed point to the reference ground 7 on the fourth metal frame 12 The fourth metal frame between them and the reference ground 7 form a Loop antenna; when the main antenna is working, the dotted arrow below indicates its equivalent current path, and the main antenna feed 17, the fifth matching circuit 18 and the third metal frame 11 form a monopole antenna. In addition, the layouts of the above-mentioned WiFi antenna and GPS antenna can be interchanged.

In the present invention, the NFC antenna can also share a metal frame with the main antenna, and the diversity antenna uses other metal frames.

The mobile terminal antenna system provided by Embodiment 2 of the present invention utilizes metal frames of different sections of the mobile terminal to form a WiFi antenna structure, a GPS antenna structure and a main antenna structure respectively, further solving the problem that the antenna is built into the antenna in the form of a patch in the prior art. The problem of occupying a lot of space in the mobile terminal saves the space of the mobile terminal, is more conducive to the miniaturization design of the mobile terminal, and further reduces the cost of the antenna.

Embodiment Three

The mobile terminal provided in Embodiment 3 of the present invention includes the mobile terminal antenna system provided in the embodiment of the present invention. The mobile terminal uses its metal frame as an antenna radiator, and at least two slits are opened on the metal frame to divide the metal frame into at least two sections, one of which is integrated with an NFC antenna structure and a diversity antenna structure, saving the space of the mobile terminal , reducing the cost of the antenna.

Wherein, the mobile terminal may be a smart phone, a tablet computer, or a personal digital assistant.

The mobile terminal provided by Embodiment 3 of the present invention includes the mobile terminal antenna system provided by the embodiment of the present invention, and has corresponding functions and beneficial effects.

Note that the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention, and the present invention The scope is determined by the scope of the appended claims.

Claims (7)

1. a kind of mobile terminal antenna system, which is characterized in that the metal edge frame including mobile terminal, near-field communication NFC feeds, First match circuit, diversity antenna feed, the second match circuit, zero inductance and reference ground；Be provided on the metal edge frame to Few two gaps, the metal edge frame between any of which adjacent slits is as the first metal edge frame；

The NFC feeds are connect by first match circuit with first metal edge frame；The diversity antenna feed leads to Second match circuit is crossed to connect with first metal edge frame；One end of the zero inductance and first metal edge frame Connection, another termination reference ground；The NFC feeds, the first match circuit, the first metal edge frame, zero inductance and with reference to landform Into NFC antenna system；The diversity antenna feed, the second match circuit and the first metal edge frame form diversity aerial system；Institute It states NFC antenna system and the diversity aerial system shares first metal edge frame as antenna radiator；

First match circuit is used to match the resonant frequency of NFC antenna；Second match circuit is for the diversity day that is widened The bandwidth of line；The zero inductance is used to improve the radiant power of NFC antenna, filters out high-frequency signal；The zero inductance is in NFC Short-circuit condition is equivalent to during Antenna Operation, open-circuit condition is equivalent to when diversity antenna works；

It is driveed on the metal edge frame there are four gap, metal edge frame sequence is divided into the first metal edge frame, the second metal edges Frame, third metal edge frame and the 4th metal edge frame；

Wireless Fidelity WiFi feeds are connect by third match circuit with one end of second metal edge frame；Global positioning system GPS feeds are connect by the 4th match circuit with one end of the 4th metal edge frame；Primary antenna feed passes through the 5th matching electricity Road is connect with the third metal edge frame；The predeterminated position of second metal edge frame and the 4th metal edge frame connects reference Ground；Each match circuit forms distributing point with the tie point of corresponding metal edge frame；The WiFi feeds, third match circuit, WiFi The second metal edge frame and reference ground on distributing point to the second metal edge frame between reference ground form WiFi antenna systems；It is described GPS feeds, the 4th match circuit, the 4th metal edge frame on GPS distributing points to the 4th metal edge frame between reference ground and reference Ground forms GPS antenna system；The primary antenna feed, the 5th match circuit and third metal edge frame form primary antenna system；

The third match circuit is for the bandwidth for the WiFi antennas that are widened, and the 4th match circuit is for the GPS antenna that is widened Bandwidth, the 5th match circuit are used for the bandwidth of primary antenna of being widened；

In four gaps, two gaps are located at the upper metal edge frame of mobile terminal, are described between described two gaps One metal edge frame；Other two gap is located at the lower metal edge frame of mobile terminal, is described between other two described gap Three metal edge frames.

2. mobile terminal antenna system according to claim 1, which is characterized in that first match circuit includes first Capacitance and the first inductance；One end of first capacitance and one end of the first inductance connect after being connected with first metal edge frame It connects, the other end of first capacitance is connect with the NFC feeds, another termination reference ground of first inductance.

3. mobile terminal antenna system according to claim 1, which is characterized in that second match circuit includes second Capacitance and the second inductance；One end of second capacitance and one end of the second inductance connect after being connected with first metal edge frame It connects, the other end of second inductance is connect with the diversity antenna feed, another termination reference ground of second capacitance.

4. mobile terminal antenna system according to claim 1, which is characterized in that the WiFi distributing points and the GPS Distributing point is located at upper metal edge frame.

5. mobile terminal antenna system according to claim 4, which is characterized in that the reference ground is set to mobile terminal On mainboard.

6. mobile terminal antenna system according to claim 5, which is characterized in that the movement on the inside of upper and lower metal edge frame Terminal mainboard is equipped with empty regions, for making first metal edge frame and the third metal edge frame far from the reference Ground.

7. a kind of mobile terminal, which is characterized in that the mobile terminal includes any mobile terminal days of claim 1-6 Linear system is united.