WO2023020467A1

WO2023020467A1 - Antenna system and electronic device

Info

Publication number: WO2023020467A1
Application number: PCT/CN2022/112695
Authority: WO
Inventors: 宋博
Original assignee: 维沃移动通信有限公司
Priority date: 2021-08-18
Filing date: 2022-08-16
Publication date: 2023-02-23
Also published as: CN113644436A; CN113644436B

Abstract

The present application relates to the technical field of communications, and discloses an antenna system and an electronic device. The antenna system comprises: a first antenna electrically connected to a motherboard (100); a second antenna electrically connected to the motherboard (100), the first antenna being coupled to the second antenna by means of a gap (S1); and an isolation apparatus (200), the isolation apparatus (200) being used for reducing the coupling between the working frequency band of the first antenna and the working frequency band of the second antenna, wherein the isolation apparatus (200) comprises a connection circuit board (201) and a filter network provided on the connection circuit board (201), and both ends of the connection circuit board (201) are respectively connected to the first antenna and the second antenna.

Description

Antenna Systems and Electronics

Cross References to Related Applications

This application claims priority to Chinese Patent Application No. 202110948888.1 filed in China on Aug. 18, 2021, the entire contents of which are hereby incorporated by reference.

technical field

The present application belongs to the technical field of communication, and specifically relates to an antenna system and electronic equipment.

Background technique

Modern people's lives are increasingly inseparable from high-speed wireless communication networks. Various entertainment, interaction, travel and other software in daily life have higher and higher requirements for data transmission rate and quality. For this reason, mobile communication technology is constantly being updated and upgraded to meet the growing network requirements. With the popularization and application of working frequency bands below 6GHz (Sub 6G) and the promotion and application of Multiple-Input Multiple-Output (MIMO) technology, more and more working frequency band resources are being developed and utilized. This also requires that the mobile communication terminal must continuously increase the number of antennas and increase the working frequency band of the antennas.

However, the miniaturization trend of mobile communication terminals makes the space that the antenna can use smaller and smaller, which leads to possible coupling between the working frequency bands of multiple antennas set in the same area (common aperture), thus reducing the antenna Efficiency, especially for antenna systems that are difficult to implement with multiple operating frequency bands.

Contents of the invention

The purpose of the embodiments of the present application is to provide an antenna system and an electronic device, which can improve antenna isolation, thereby solving the above-mentioned problem of coupling between working frequency bands of multiple antennas.

In order to solve the above-mentioned technical problems, the application is implemented as follows:

In a first aspect, the embodiment of the present application provides an antenna system, the antenna system includes: a first antenna electrically connected to the motherboard 100; a second antenna electrically connected to the motherboard 100, the first antenna and the The second antenna is coupled and connected through the gap S1; and an isolation device 200, the isolation device 200 is used to reduce the coupling between the operating frequency band of the first antenna and the operating frequency band of the second antenna, wherein the The isolation device 200 includes a connection circuit board 201 and a first filter network disposed on the connection circuit board 201 , and two ends of the connection circuit board 201 are respectively connected to the first antenna and the second antenna.

In a second aspect, an embodiment of the present application provides an electronic device, where the electronic device includes the antenna system.

In the embodiment of the present application, by using the isolation device including connecting the circuit board and the first filter network to reduce the coupling between the working frequency bands of adjacent antennas, the effect of improving isolation can be achieved.

Description of drawings

FIG. 1 is a schematic structural diagram of an antenna system according to an embodiment of the present application;

2 is a schematic structural diagram of a connecting circuit board in an antenna system according to an embodiment of the present application;

FIG. 3 is a circuit diagram for illustrating the structure of a first filter network according to an embodiment of the present application;

FIG. 4 shows a current path of a working frequency band in an antenna in an antenna system according to an embodiment of the present application;

5 is a schematic diagram illustrating that in the antenna system according to an embodiment of the present application, the coupling path generated by the first filter network cancels the coupling path between the working frequency bands of the antenna;

Fig. 6 shows the isolation degree of the antenna system according to the related art, wherein the connection circuit board and the first filter network in the antenna system according to an embodiment of the present application are not provided;

Fig. 7 shows the isolation of an antenna system according to an embodiment of the present application;

FIG. 8 shows a schematic structural diagram of an antenna system according to another embodiment of the present application;

FIG. 9 shows a current path of a working frequency band in an antenna in an antenna system according to another embodiment of the present application;

Fig. 10 shows the isolation of an antenna system according to another embodiment of the present application;

Fig. 11 has illustrated the radiation efficiency comparison of the antenna system according to the related art and the antenna system according to another embodiment of the present application in the N79 and WIFI 5G operating frequency bands;

FIG. 12 shows a schematic structural diagram of an antenna system according to yet another embodiment of the present application;

FIG. 13 shows a schematic structural diagram of an antenna system according to yet another embodiment of the present application;

FIG. 14 shows a schematic structural diagram of a connecting circuit board in an antenna system according to yet another embodiment of the present application;

Fig. 15 shows a schematic diagram of the unfolded structure of the connecting circuit board in the antenna system according to yet another embodiment of the present application;

Fig. 16 is a schematic diagram of a hardware structure of an electronic device according to an embodiment of the present application.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

The terms "first", "second" and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the application can be practiced in sequences other than those illustrated or described herein. In addition, "and/or" in the specification and claims means at least one of the connected objects, and the character "/" generally means that the related objects are an "or" relationship.

The antenna system and the electronic device provided by the embodiments of the present application will be described in detail below through specific embodiments and application scenarios with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of an antenna system according to an embodiment of the present application.

As shown in FIG. 1 , the antenna system includes: a first antenna electrically connected to the main board 100 ; and a second antenna electrically connected to the main board 100 . The first antenna and the second antenna are coupled and connected through the gap S1. Here, the gap can also be referred to as a broken seam, and the gap S1 can be filled with plastic or air. For example, the first antenna may include a first radiation part A1, a first matching network M1 and a first feed F1. For example, the second antenna may include a second radiating part A2, a second matching network M2 and a second feed source F2. The first antenna and the second antenna are coupled and connected through the gap S1, so that they are arranged adjacently, that is, in the same area. Therefore, the antenna system formed by the first antenna and the second antenna can also be called a common-aperture antenna system.

In addition, the first radiation part A1 of the first antenna and the second radiation part A2 of the second antenna are respectively connected to the first ground point G1 and the second ground point G2. The first feed source F1 of the first antenna and the first feed source F2 of the second antenna are respectively connected to the main return ground G0. Here, the main return ground G0 can be a part of the metal casing (for example, a metal front shell) of the electronic device or a separately provided conductive member (for example, a steel sheet), or it can be a conductive structure on the main board (for example, a conductive wiring) .

The first radiating part A1 of the first antenna and the second radiating part A2 of the second antenna can be a part of the metal casing (for example, a metal middle frame) of the electronic device, a flexible printed circuit (Flexible Printed Circuit, FPC), or through a laser Conductive components formed by direct structuring technology (Laser Direct Structuring, LDS) and printing direct structuring technology (Printing Direct Structure, PDS). Specifically, as shown in FIG. 1, the first radiation part A1 of the first antenna and the second radiation part A2 of the second antenna may be separated by a gap S1.

The first matching network M1 of the first antenna and the second matching network M2 of the second antenna are matching networks on the feeders of the two antennas, which may be composed of capacitors and inductors, and are used to match the input impedance of the working frequency band of the antennas.

In addition, a loading point G3 may be further provided, and the loading point G3 is connected to a part of the second radiation portion A2 close to the gap S1, and the distance between the loading point G3 and the gap S1 can be designed within 5 mm. The design of the loading point G3 can be a capacitor connected in series to the ground, or a protruding metal tongue suspended in the air.

As shown in FIG. 1 , an isolation device 200 for reducing the coupling between the operating frequency bands of the first antenna and the second antenna is provided in the antenna system according to the embodiment of the present application.

Specifically, the isolation device 200 may include a connection circuit board 201 and a first filtering network disposed on the connection circuit board 201 , and two ends of the connection circuit board 201 are respectively connected to the first antenna and the second antenna. Although it is shown in FIG. 1 that the first filtering network includes two sub-filtering networks, that is, the first sub-filtering network N1 and the second sub-filtering network N2, the embodiment of the present application is not limited thereto, and one or more filtering network. Therefore, in the embodiment of the present application, by using the isolation device including connecting the circuit board and the first filter network to reduce the coupling between the working frequency bands of adjacent antennas, the isolation can be improved.

In addition, in some embodiments, the connection circuit board 201 may be disposed above the motherboard 100 . That is to say, the first filtering network is elevated above the motherboard 100 through the connection circuit board 201 , so that the vertical projection of the connection circuit board 201 overlaps with the motherboard 100 at least partially.

Considering the isolation of some antennas with the same frequency or close frequency, it is difficult to arrange the antennas in the same area in the conventional antenna system. Especially, when the layout space is seriously tight, if necessary, one or more of some co-frequency or near-frequency antennas must be sacrificed and placed in a farther position to improve the spatial isolation.

As mentioned above, in the embodiment of the present application, by setting the connection circuit board 201 above the main board 100 and setting the first filter network on the connection circuit board 201 instead of the main board 100, the metal wiring and filtering on the connection circuit board 201 The network can have a larger setting space, which greatly improves the effect of improving the isolation and the radiation efficiency of the antenna. For example, the metal wiring on the connection circuit board 201 can be set to a width of 2 mm or more.

In addition, since the connecting circuit board 201 is arranged above the main board 100, that is, the connecting circuit board 201 itself is in an elevated state, the metal wiring and filter network arranged on the connecting circuit board 201 and other electrical components arranged on the main board 100 have a space The upper space has better environmental space, and does not need to occupy the space of the motherboard 100. Therefore, the effect of improving the isolation is more significant.

Fig. 2 is a schematic structural diagram of a connecting circuit board in an antenna system according to an embodiment of the present application.

Referring to FIG. 2 , in some embodiments, the connection circuit board 201 may be disposed above the main board 100 through an insulating bracket P1 . That is to say, the connecting circuit board 201 can be supported by the insulating support P1 and thus be arranged on a plane higher than the plane where the main board 100 is located by a certain height. For example, the insulating support P1 may be a plastic support. Here, FIG. 2 shows that the main return ground G0 is a conductive structure on the motherboard 100 .

In some embodiments, the insulating support P1 has a hollow portion to expose the main board 100 disposed under the insulating support P1. Therefore, the space of the main board 100 under the insulating support P1 is also utilized, thereby saving the area occupied by the board to the greatest extent. Here, the hollow part may be the lower part of the insulating support P1, or both the lower part and the upper part of the insulating support P1.

Referring again to FIG. 1 and FIG. 2, in some embodiments, the connection circuit board 201 includes a plurality of first metal stubs L1, and a first filter network is connected in series between the first metal stubs L1 (for example, as shown in the figure The first sub-filtering network N1 and the second sub-filtering network N2 in the first filtering network).

Specifically, as shown in FIG. 1, the above-mentioned "connect the two ends of the circuit board 201 to the first antenna and the second antenna respectively" may be the feed path where the end of the first metal branch L1 on the left side is connected to the first antenna. , and the end of the first metal branch L1 on the right side is connected to the feeder of the second antenna. The feed circuit refers to the feed path including the feed source and matching network. FIG. 1 shows that the ends of the first metal branch L1 are respectively connected to the feeder metal extending from the first radiation part A1 of the first antenna and the second radiation part A2 of the second antenna. The overall length of the plurality of first metal branches L1 may be in the range of 15mm-25mm. Here, as required, the first sub-filter network N1 and the second sub-filter network N2 may be disposed adjacent to both ends of the connection circuit board 201 . It should be understood that, according to the number of antennas in the antenna system and different working frequency bands, the number and position of the sub-filter networks and the length of the first metal branch L1 connected to the circuit board 201 may vary.

The first filter network can be set so that the first filter network exhibits different characteristics in the low-frequency operating frequency band and the high-frequency operating frequency band, thereby achieving the purpose of reducing coupling.

Specifically, the first filter network can be set to exhibit inductance characteristics near the low-frequency operating frequency band. In addition, the first filter network can also be set to present a high-impedance state near the high-frequency operating frequency band, and the first metal stubs are set so that the electrical length of the first metal stubs between the first filter networks is set to be equal to that of the high-frequency operating frequency band. The half wavelength, or the first metal branch connected to the feeder of the first antenna or the feeder of the second antenna forms a radiation path for the working frequency band in the first antenna and/or the second antenna. For example, the low-frequency working frequency band may be a Long Term Evolution (Long Term Evolution, LTE) B32 working frequency band, a Global Positioning System (Global Positioning System, GPS) L1/L5 working frequency band, or other low-frequency working frequency bands. For example, the high-frequency working frequency band may be a Wireless Fidelity (Wireless Fidelity, WIFI) 5G working frequency band, an N79 working frequency band, or other high-frequency working frequency bands (eg, N77/N78 working frequency band). Here, the electrical length refers to the ratio of the physical length to the wavelength of the electromagnetic wave signal transmitted thereon.

In antenna systems of the related art, decoupling solutions using circuit structures such as floor coupling stubs and neutral wires have been proposed.

However, such a decoupling solution takes up a lot of board layout space, usually only solves the problem of single-frequency isolation, and there is no way to optimize the performance of the antenna, especially there is no way to improve the performance of other working frequency bands of the antenna.

Here, it should be pointed out that the embodiment of the present application has the advantages of both the neutral line and the coupling stub decoupling technology, and can simultaneously use the neutral line and the coupling stub decoupling technology to perform decoupling in different working frequency bands. In addition, in some embodiments, by arranging the connection circuit board above the main board, a technical solution with excellent performance can be further formed as a whole.

In addition, compared with the floor coupling stub scheme in the related art by additionally setting the radiating part grounded through the filter circuit, the technical scheme proposed in the embodiment of the present application realizes more working frequency bands and better performance on the basis of decoupling. Radiation efficiency, and can use very little space at low frequencies (for example, around 1.45GHz where the LTE B32 operating frequency band is located). In contrast, the above-mentioned scheme of additionally setting the radiating part grounded through the filter circuit needs to use at least three times the space, so it is difficult to realize in actual engineering, and it is far from realizing so many advantages of the embodiment of the present application. Working frequency.

On the other hand, due to the height and width design provided by the elevated first metal branch (decoupling branch), in addition to the decoupling function, the technical solution proposed in the embodiment of the present application can further increase the working frequency band in the high frequency part, Thereby improving radiation efficiency. That is to say, the technical solutions proposed in the embodiments of the present application can simultaneously have a decoupling function and a radiation function.

The working principle and circuit structure of the first filtering network will be described in detail below with reference to FIGS. 3-11 .

FIG. 3 is a circuit diagram illustrating the structure of a first filter network according to an embodiment of the present application.

In some embodiments, the first filtering network may include a single inductor, a single capacitor, or a series/parallel connection combination of an inductor and a capacitor to produce at least one operating frequency band with the first antenna and at least one operating frequency band of the second antenna. The coupling path between the bands cancels out the coupling path. (1), (2), (3), (4), (5) and (6) of FIG. 3 respectively provide exemplary circuit structures, wherein L represents an inductor, and C represents a capacitor. The first filtering network may comprise circuit structures selected from (1), (2), (3), (4), (5) and (6) of FIG. 3 and their series/parallel connection combinations.

However, the form of the first filtering network is not limited thereto, and may have other combined structures of inductors and capacitors.

Specifically, since the first filter network can be set to exhibit inductance characteristics near the low-frequency operating frequency band, the first filter network can equivalently form a new coupling path in the low-frequency operating frequency band to offset the original coupling path.

In addition, the first filter network is further set to present a high-impedance state near the high-frequency operating frequency band, and the first metal stub is set so that the electrical length of the first metal stub L1 between multiple sub-filter networks in the first filter network When it is set to the half-wavelength of the high-frequency working frequency band, the first metal branch L1 between the multiple sub-filter networks in the first filter network can be in an approximately suspended state, so that the suspended first metal branch L1 can be connected to the first metal branch L1 respectively. The first antenna and the second antenna couple out a new coupling path to cancel out the original coupling path.

In addition, the first filter network is further set to present a high-impedance state near the high-frequency operating frequency band, and the first metal stub L1 connected to the feeder of the first antenna or the feeder of the second antenna forms a connection between the first antenna and the second antenna. /or in the case of the radiation path of the working frequency band in the second antenna, because the first filter network in the high-impedance state makes the electrical connection disconnected, so the first antenna connected to the feeder of the first antenna or the feeder of the second antenna The metal stub L1 may form a radiation path for the working frequency band in the first antenna and/or the second antenna. As a result, the working frequency band is widened and the radiation function is realized.

As mentioned above, the technical solution proposed by the embodiment of the present application can be configured to realize the decoupling function in the low-frequency working frequency band or the high-frequency working frequency band, and can also be configured to realize the radiation function in the high-frequency working frequency band. Hereinafter, the decoupling function and the radiation function will be further described in detail with reference to FIGS. 4-11 .

Fig. 4 shows the current path of the working frequency band in the antenna in the antenna system according to an embodiment of the present application, and Fig. 5 illustrates that in the antenna system according to an embodiment of the present application, the coupling path produced by the first filter network cancels Schematic diagram of the coupling path between the antenna's operating frequency bands.

Referring back to FIG. 1 , as an example, the first filter network may include a first sub-filter network N1 and a second sub-filter network N2 connected to each other in series. For example, the first sub-filter network N1 can be arranged adjacent to the first antenna, and the second sub-filter network N2 can be arranged adjacent to the second antenna.

The first sub-filter network N1 and the second sub-filter network N2 can be configured to exhibit inductance characteristics near the low-frequency operating frequency band. For example, when the low-frequency operating frequency band to be decoupled is the LTE B32 operating frequency band, the first sub-filtering network N1 and the second sub-filtering network N2 can be set to present inductive characteristics near the LTE B32 operating frequency band.

In addition, the first sub-filter network N1 and the second sub-filter network N2 can be set to present a high-impedance state near the high-frequency operating frequency band, and the first metal stub between the first sub-filter network N1 and the second sub-filter network N2 The electrical length is set to half the wavelength of the high-frequency operating frequency band. For example, when the high-frequency working frequency band that needs to be decoupled is the WIFI 5G working frequency band, the first sub-filter network N1 and the second sub-filter network N2 can be set to present a high-impedance state near the WIFI 5G working frequency band.

In some embodiments, the first sub-filtering network N1 may be composed of a first inductor (ie, structure (5) shown in FIG. 3 ), and the second sub-filtering network N2 may be composed of a second inductor and a first capacitor ( That is, the structure (3)) shown in FIG. 3 is configured by connecting them in parallel.

That is to say, in the vicinity of the low-frequency operating frequency band, the second sub-filter network N2 composed of a single inductor and a single capacitor connected in parallel can exhibit inductive characteristics, and then added to the single inductor of the first sub-filter network N1 at low frequencies, etc. A new coupling path is created to offset the original coupling path.

Near the high-frequency operating frequency band, the second sub-filter network N2 composed of a single inductor and a single capacitor connected in parallel can exhibit a high-impedance state (that is, a disconnected state), so that the first sub-filter network N1 and the second sub-filter The first metal branches between the networks N2 are in an approximately suspended state. As a result, the suspended first metal branch can respectively couple two new coupling paths with the first antenna and the second antenna, so as to offset the original coupling path.

It should be understood that the embodiment of the present application is not limited to the circuit structure formed by the parallel connection of structures (5) and (3) shown in FIG. The high-frequency working frequency band only needs to satisfy the above-mentioned characteristics respectively.

The following will be described in conjunction with an example of a specific working frequency band.

As an example of specific working frequency bands, the first antenna may include LTE B32 working frequency band, WIFI 2.4G working frequency band and WIFI 5G working frequency band, and the second antenna may include GPS L1 working frequency band, GPS L5 working frequency band and N79 working frequency band.

Among them, the LTE B32 working frequency band roughly has a frequency range of 1.45-1.49GHz, the WIFI 2.4G working frequency band roughly has a frequency range of 2.400-2.5GHz, the WIFI 5G working frequency band roughly has a frequency range of 4.900-5.9GHZ, the GPS L1 working frequency band and The GPS L5 operating frequency bands are roughly 1.57GHz and 1.17GHz respectively, and the N79 operating frequency band roughly has a frequency range of 4.4-5.0GHz.

Therefore, the LTE B32 working frequency band of the first antenna is close to the GPS L1/L5 working frequency band of the second antenna, and the WIFI 5G working frequency band of the first antenna is close to the N79 working frequency band of the second antenna.

As shown in Figure 4, the current path of the LTE B32 operating frequency band is C1, the current path of the WIFI 2.4G operating frequency band is C2, the current path of the WIFI 5G operating frequency band is C3, the current path of the GPS L1 operating frequency band is C4, and the GPS L5 operating frequency path is C4. The current path of the working frequency band is C5, and the current path of the N79 working frequency band is C6.

Specifically, the current path corresponds to the working mode (that is, the working path) of different working frequency bands of the antenna, which is the amplitude and phase distribution of the standing wave current corresponding to the frequency point on the radiation part of the antenna. Among them, there is a phase reversal point in the middle of the working mode corresponding to the current path C6 of the N79 working frequency band, so it is represented by a double-headed arrow. One of the reasons for the coupling generated by the same frequency or near frequency is that their operating frequency bands excite the same or similar current paths.

(A) and (B) of Figure 5 respectively illustrate the situation of canceling the coupling of the LTE B32 working frequency band of the first antenna and the GPS L1/L5 working frequency band of the second antenna, and canceling the WIFI 5G working frequency band of the first antenna and the second antenna The coupling situation of the N79 working frequency band.

Due to the above current path distribution, as shown in FIG. 5, the LTE B32 operating frequency band of the first antenna and the GPS L1/L5 operating frequency band of the second antenna are coupled to each other through the first coupling path CN1. Similarly, the WIFI 5G working frequency band of the first antenna and the N79 working frequency band of the second antenna are coupled to each other through the third coupling path CN3.

Here, the first sub-filter network N1 and the second sub-filter network N2 are set to exhibit inductance characteristics near the LTE B32 operating frequency band. That is to say, by setting the values of capacitors and inductors in the first sub-filter network N1 and the second sub-filter network N2, the first sub-filter network N1 and the second sub-filter network N2 present inductance near the LTE B32 operating frequency band characteristic.

Therefore, as shown in (A) of Figure 5, the first sub-filter network N1 and the second sub-filter network N2 produce a new coupling path near the relatively low-frequency LTE B32 operating frequency band and the GPS L1/L5 operating frequency band, namely The second coupling path CN2. The second coupling path CN2 cancels out the original first coupling path CN1, thereby improving the isolation between the LTE B32 operating frequency band of the first antenna and the GPS L1/L5 operating frequency band of the second antenna.

Here, the first sub-filter network N1 and the second sub-filter network N2 can also be set to present a high-impedance state near the WIFI 5G working frequency band, so that the first sub-filter network N1 and the second sub-filter network N2 The electrical length of the metal branch L1 is half the wavelength of the WIFI 5G working frequency band (or N79 working frequency band). That is to say, by setting the values of capacitors and inductors in the first sub-filter network N1 and the second sub-filter network N2, the first metal stub L1 between the first sub-filter network N1 and the second sub-filter network N2 The electrical length is half the wavelength of the WIFI 5G working frequency band.

Therefore, as shown in (B) of Figure 5, the first metal stub L1 between the first sub-filter network N1 and the second sub-filter network N2 produces two new coupling paths near 5G, namely the fourth coupling path CN4 and the fifth coupling path CN5. The fourth coupling path CN4 and the fifth coupling path CN5 respectively cancel out the original third coupling path CN3, thereby improving the isolation between the WIFI 5G working frequency band of the first antenna and the N79 working frequency band of the second antenna.

Specifically, for example, when the first antenna works in the LTE B32 working frequency band and the second antenna works in the GPS L1/L5 working frequency band, the second sub-filtering network N2 composed of a single inductor connected in parallel with a single capacitor can be set to operate in LTE The vicinity of the working frequency band of B32 presents an inductance characteristic, which is added to the single inductance of the first sub-filter network N1 to generate a coupling path CN2 in the low frequency working frequency band. As a result, the isolation between the LTE B32 working frequency band of the first antenna and the GPS L1/L5 working frequency band of the second antenna is improved, enabling both to work normally at the same time.

In addition, for example, when the first antenna works in the WIFI 5G working frequency band and the second antenna works in the N79 working frequency band, the second sub-filter network N2 composed of a single inductor connected in parallel with a single capacitor can present a high impedance near the 5G working frequency band state (that is, the disconnected state), so that the first metal branch L1 between the first sub-filter network N1 and the second sub-filter network N2 presents an approximately suspended state near the WIFI 5G working frequency band. By setting the length of the first metal branch L1 and the inductance value of the first sub-filter network N1 composed of a single inductor, the electrical length of the first metal branch L1 is about half the wavelength of the 5G working frequency band, so that the first metal The branch L1 generates a fourth coupling path CN4 and a fifth coupling path CN5 respectively coupled with the first antenna and the second antenna near the WIFI 5G working frequency band. As a result, the isolation between the WIFI 5G working frequency band of the first antenna and the N79 working frequency band of the second antenna is improved, enabling both to work normally at the same time.

In addition, as mentioned above, in some embodiments, since the connection circuit board itself is in an elevated state, the metal wiring (for example, the first metal stub L1) and the first filter network disposed on the connection circuit board are different from those disposed on the main board. Other electrical components on the board are spaced apart for better environmental space without occupying board space. Therefore, the effect of improving the isolation is more significant. The width of the elevated first metal branch L1 can be set to 2mm or more, so that the effect of improving the isolation between the WIFI 5G working frequency band of the first antenna and the N79 working frequency band of the second antenna is more significant.

Figure 6 shows the isolation of the antenna system according to the related art, wherein the connection circuit board and the first filter network in the antenna system according to an embodiment of the application are not provided, and Figure 7 shows the isolation according to an embodiment of the application The isolation of the antenna system.

As shown in Figure 6, near the LTE B32 operating frequency band (about 1.5GHz) and near the N79 operating frequency band (about 5.0GHz), the isolation of the two antennas is very poor, and it also affects the S parameters of each antenna itself. The S parameter represents the return loss of the antenna, and the smaller the value of the S parameter, the better the impedance matching.

Therefore, in order to work normally, the antenna system according to related technologies can only realize four working frequency bands including GPS L1, GPS L5, WIFI 2.4G and WIFI 5G.

However, as shown in Figure 7, by using the connection circuit board configured as above and the first filter network arranged on the connection circuit board, it can be seen that the isolation is improved by nearly 10dB near the LTE B32 operating frequency band. , and the improvement of the isolation near the N79 working frequency band is also more than 10dB.

Therefore, the antenna system according to an embodiment of the present application adds two working frequency bands of LTE B32 and N79, thereby realizing the working frequency band of LTE B32, WIFI 2.4G, WIFI 5G, GPS L1 and GPS L5. The frequency band and the N79 working frequency band have a total of six working frequency bands.

Fig. 8 shows a schematic structural diagram of an antenna system according to another embodiment of the present application.

Referring to FIG. 8 , as another example, the first filter network may include a third sub-filter network N3.

The third sub-filter network N3 can be set to exhibit inductance characteristics near the low-frequency operating frequency band. For example, the low frequency working frequency band may be LTE B32 working frequency band or GPS L1/L5 working frequency band, or other low frequency working frequency bands. For example, when the low-frequency working frequency band to be decoupled is the LTE B32 working frequency band, the third sub-filtering network N3 can be set to exhibit inductive characteristics near the LTE B32 working frequency band.

In addition, the third sub-filter network N3 can be set to present a high-impedance state near the high-frequency operating frequency band, and the first metal stub L1 located on both sides of the third sub-filter network N3 is used for the first antenna and/or the second antenna The radiation path in the working frequency band. For example, the high-frequency working frequency band can be the WIFI 5G working frequency band or the N79 working frequency band.

Specifically, the third sub-filter network N3 may be formed by connecting a third inductor and a fourth capacitor in parallel. That is, the third sub-filter network N3 may have the circuit structure shown in (3) of FIG. 3 .

Therefore, in the vicinity of the low-frequency operating frequency band, the third sub-filter network N3 composed of a single inductor and a single capacitor connected in parallel can exhibit inductive characteristics, and then equivalently create a new coupling path in the low-frequency operating frequency band to match the original coupling path offset.

Near the high-frequency operating frequency band, the third sub-filter network N3 composed of a single inductor and a single capacitor connected in parallel can present a high-impedance state (i.e., a disconnected state), which can make it located on both sides of the third sub-filter network N3 (i.e. , from the feeder metals of the first and second antennas to the first metal stub L1 of the third sub-filter network N3) form a radiation path for the working frequency band in the first antenna and/or the second antenna. As a result, the working frequency band is widened and the radiation function is realized. For example, the formed radiation path can be used in the N79 working frequency band. However, the radiation path formed by the embodiment of the present application is not limited to be used in the N79 working frequency band, and may also be used in other similar working frequency bands (for example, the N77/N78 working frequency band). Here, the high-frequency working frequency band may be the WIFI 5G working frequency band, the N79 working frequency band, or other high-frequency working frequency bands (for example, the N77/N78 working frequency band). For example, when the existing high-frequency working frequency band is the WIFI 5G working frequency band, the third sub-filter network N3 can be set to present a high-impedance state near the WIFI 5G working frequency band, whereby the first metal stub L1 can be used to form a new The radiation path of the working frequency band.

It should be understood that the embodiment of the present application is not limited to the circuit structure formed by the structure (3) shown in the above-mentioned FIG. It is sufficient to satisfy the above characteristics.

As an example of a specific working frequency band, the first antenna may include LTE B32 working frequency band, WIFI 2.4G working frequency band, WIFI 5G working frequency band and N79 working frequency band, and the second antenna may include GPS L1 working frequency band, GPS L5 working frequency band. Therefore, the LTE B32 working frequency band of the first antenna is close to the GPS L1/L5 working frequency band of the second antenna.

Here, as shown in FIG. 8 , the first filter network may include a third sub-filter network N3.

In some embodiments, the distance between the third sub-filtering network N3 and the end of the first metal branch L1 on the left side may be in the range of 5mm-10mm.

Fig. 9 shows a current path of a working frequency band in an antenna in an antenna system according to another embodiment of the present application.

As shown in Figure 9, the current path of the LTE B32 working frequency band is C1, the current path of the WIFI 2.4G working frequency band is C2, the current path of the WIFI 5G working frequency band is C3, the current path of the GPS L1 working frequency band is C4, and the GPS L5 The current path of the working frequency band is C5, and the current path of the N79 working frequency band is C6.

Here, the third sub-filter network N3 is set to exhibit inductance characteristics near the LTE B32 operating frequency band. Therefore, similar to the situation shown in (A) of Figure 5, the third sub-filter network N3 introduces a new coupling path near the relatively low-frequency LTE B32 operating frequency band, which can cancel out the original first coupling path CN1 , thereby improving the isolation between the LTE B32 working frequency band of the first antenna and the GPS L1/L5 working frequency band of the second antenna.

Here, the third sub-filtering network N3 can also be set to present a high-impedance state near the WIFI 5G working frequency band, and the first metal branches L1 located on both sides of the third sub-filtering network N3 are used for the first antenna and/or the second The radiation path of the working frequency band in the two antennas.

Specifically, Figure 9 shows that the newly introduced radiation path C6 of the WIFI 5G working frequency band (that is, the path from the feeder metal to the filtering network realizes a quarter-wavelength working mode of a monopole antenna) . The radiation path C6 must require the third sub-filter network N3 loaded in the middle to achieve high impedance and block its current in the WIFI 5G working frequency band to realize the quarter-wavelength working mode of the monopole antenna. Therefore, the N79 working frequency band can be realized on the first antenna.

Radiation path C6 corresponds to the first resonance at the 5G position in Figure 10, and this resonance works in the N79 operating frequency band.

For example, the third sub-filter network N3 is formed by connecting a third inductor and a fourth capacitor in parallel. Therefore, as mentioned above, the third sub-filter network N3 can present inductive characteristics near the LTE B32 operating frequency band or the GPS L1/L5 operating frequency band, and can present a high-impedance state (that is, the disconnected state) in the WIFI 5G operating frequency band or the N79 operating frequency band. ), so that the first metal branches L1 on both sides form a radiation path for the N79 working frequency band.

It should be understood that although FIG. 9 only shows the use of the first metal branch L1 connected to the first antenna (that is, the metal branch on the left) as the radiation path of the new working frequency band, depending on the design, it may also be considered to use the same The first metal branch L1 connected to the two antennas (ie, the metal branch on the right) serves as the radiation path of the new working frequency band. Even, in some complex designs, it may be considered to use multiple metal branches L1 to form multiple radiation paths of different working frequency bands at the same time. These all belong to the inventive concepts of the embodiments of the present application.

As mentioned above, compared with the decoupling solutions of circuit structures such as floor coupling stubs and neutral lines in the related art, which take up a large area of space, the technical solutions proposed by some embodiments of the present application make full use of the height space, Only then can it not only solve the space bottleneck in practical engineering applications but also make use of a better environment, and make the decoupling components (such as filter networks and metal stubs) themselves have radiation functions in addition to decoupling functions.

Figure 10 shows the isolation of the antenna system according to another embodiment of the application, and Figure 11 illustrates the radiation efficiency of the antenna system according to the related art and the antenna system according to another embodiment of the application in the N79 and WIFI 5G operating frequency bands Compare.

As shown in FIG. 10, by using the connection circuit board 201 configured as above and the first filter network disposed on the connection circuit board 201, the isolation near the LTE B32 operating frequency band is improved by about 10dB. In addition, the first antenna also increases the N79 working frequency band.

As shown in FIG. 11 , by using the connection circuit board 201 configured as above and the first filter network disposed on the connection circuit board 201, the radiation efficiency of the antenna system in the WIFI 5G working frequency band is significantly improved.

Referring back to FIG. 2 , (A) and (B) of FIG. 2 respectively show two implementations of connecting the circuit board 201 .

Specifically, as shown in (A) of FIG. 2 , the end of the first metal branch L1 on the left side and the end of the first metal branch L1 on the right side can be respectively fixed to the first antenna from the first antenna by screws. The feeder metal extending from the first radiating part A1 and the second radiating part A2 of the second antenna. For example, the first metal branch L1 can be connected to the first radiating part A1 of the first antenna and the metal of the second radiating part A2 of the second antenna at the first connecting part SC1 and the second connecting part SC2 on both sides through screws. Middle frame connection.

In addition, as shown in (B) of FIG. superior. For example, the first metal branch L1 can be welded to the main board 100 at the first welding portion ST1 and the second welding portion ST2 located on both sides.

Fig. 12 shows a schematic structural diagram of an antenna system according to yet another embodiment of the present application.

Referring to FIG. 12 , the antenna system may further include a third feed F3 connected to the main board 100 . The third feed F3 is also connected to the second radiation portion A2 of the second antenna.

Specifically, compared with the embodiment in FIG. 1 , the antenna system according to yet another embodiment of the present application can connect the third feed source F3 to the second radiating part A2 via the third matching network M3, thereby forming a The third antenna of the common radiating part. That is to say, the third radiating portion A3 of the third antenna and the second radiating portion A2 of the second antenna form a common body. Therefore, the entire antenna system has also evolved into a common-aperture three-antenna system. According to needs, the third antenna can realize working frequency bands such as N78/N77/N79.

In addition, although FIG. 12 shows that a third antenna is added on the basis of the embodiment in FIG. 1 , it should be understood that one or more additional antennas may also be added to other embodiments herein in a similar manner. Moreover, it should be understood that the isolation between the working frequency bands of the added one or more additional antennas and the working frequency bands of other antennas can also be improved by connecting the circuit board and the aforementioned functions of the first filtering network.

Fig. 13 shows a schematic structural diagram of an antenna system according to yet another embodiment of the present application, and Fig. 14 shows a schematic structural diagram of a connecting circuit board in the antenna system according to yet another embodiment of the present application.

13 and 14, the connecting circuit board 201 further includes a plurality of second metal branches arranged between the first metal branch L1 and the main return ground G0 of the main board 100, and a plurality of second metal branches are connected in series between the plurality of second metal branches. Second filtering network.

Specifically, compared with the embodiment in FIG. 1 , the antenna system according to still another embodiment of the present application connects the second metal branch to the main return ground G0 of the main board 100 in the middle of the first metal branch L1, and the second metal branch A second filtering network is connected in series in the middle. The second filtering network may adopt any of the 6 forms including but not limited to those shown in FIG. 3 .

Therefore, in the antenna system according to yet another embodiment of the present application, by adjusting the positions of the first filter network and the second filter network and the adjustment of the values of the components included, it is possible to realize the isolation optimization of more operating frequency bands at the same time, and Add more working frequency bands and improve the radiation efficiency of the original working frequency bands.

In addition, although Fig. 13 and Fig. 14 show that a second filtering network and a second metal stub are added on the basis of the embodiment in Fig. 1, it should be understood that a or multiple additional filter networks and metal stubs.

Fig. 15 shows a schematic diagram of an unfolded structure of a connecting circuit board in an antenna system according to yet another embodiment of the present application.

Referring to FIG. 15 , compared with the embodiments in FIG. 13 and FIG. 14 , in the antenna system according to yet another embodiment of the present application, the connection circuit board is further optimized in design. The unfolded state of the flexible portion connecting the circuit board is shown in FIG. 15 . Wherein, the isolation device 200 may further include a first switch SW1, which is arranged in series with the sub-filter network in the first filter network, so as to control whether the sub-filter network works. In addition, the isolation device 200 may further include a second switch SW2, which is arranged in series with the sub-filter network in the second filter network to control whether the sub-filter network in the second filter network works.

Specifically, in some embodiments, as shown in FIG. 15 , the first switch SW1, the second switch SW2 and the third switch SW3 can be connected in series in the metal branch, and each switch can switch each sub-filter network, Thereby controlling whether the corresponding sub-filter network works.

Here, the switch is not limited to the SPDT switch shown in FIG. 15 , and may be a multi-way switch, or may have a combination of multiple individual switches in series and/or in parallel. The devices in the sub-filter network are not limited to a single capacitor C and inductor L, and may be in any form including but not limited to FIG. 3 .

Therefore, in the antenna system according to yet another embodiment of the present application, the combination of various sub-filter networks can be realized by controlling whether the sub-filter network works through the switch, so as to realize the improvement of the isolation of more working frequency bands, and can also realize The expansion of more working frequency bands and the improvement of radiation efficiency.

In addition, although FIG. 15 shows that a switch is added on the basis of the embodiment in FIG. 13 and FIG. 14 , it should be understood that one or more additional switches can also be added to other embodiments herein in a similar manner.

An embodiment of the present application also provides an electronic device including the above-mentioned antenna system. In the embodiment of the present application, electronic devices include but are not limited to mobile phones, tablet computers, notebook computers, palmtop computers, vehicle terminals, wearable devices (such as bracelets, glasses), and pedometers. Alternatively, the electronic device may also be a television, a set-top box, a desktop computer, a computer monitor integrated with a computer, or other suitable electronic devices.

16, electronic equipment 1600 includes but not limited to: radio frequency unit 1601, network module 1602, audio output unit 1603, input unit 1604, sensor 1605, display unit 1606, user input unit 1607, interface unit 1608, memory 1609, and processing Device 1610 and other components.

It should be understood that, in the embodiment of the present application, the radio frequency unit 1601 can be used for receiving and sending signals during information sending or calling, specifically, after receiving the downlink data from the base station, it can be processed by the processor 1610; Uplink data is sent to the base station.

Generally, the radio frequency unit 1601 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. Here, the foregoing antenna system according to the embodiment of the present application may be used as the antenna in the radio frequency unit 1601 . In addition, the radio frequency unit 1601 can also communicate with the network and other devices through a wireless communication system.

The electronic device provides users with wireless broadband Internet access through the network module 1602, such as helping users send and receive emails, browse web pages, and access streaming media.

The audio output unit 1603 may convert audio data received by the radio frequency unit 1601 or the network module 1602 or stored in the memory 1609 into an audio signal and output as sound. Also, the audio output unit 1603 may also provide audio output related to a specific function performed by the electronic device 1600 (for example, call signal reception sound, message reception sound, etc.). The audio output unit 1603 includes a speaker, a buzzer, a receiver, and the like.

The input unit 1604 is used to receive audio or video signals. It should be understood that, in this embodiment of the present application, the input unit 1604 may include a graphics processor (Graphics Processing Unit, GPU) 16041 and a microphone 16042, and the graphics processor 16041 is used for the image capture device ( Such as the image data of the still picture or video obtained by the camera) for processing.

The electronic device 1600 also includes at least one sensor 1605, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor and a proximity sensor, wherein the ambient light sensor can adjust the brightness of the display panel 16061 according to the brightness of the ambient light, and the proximity sensor can turn off the display panel 16061 and the / or backlighting. As a kind of motion sensor, the accelerometer sensor can detect the magnitude of acceleration in various directions (generally three axes), and can detect the magnitude and direction of gravity when it is still, and can be used to identify the posture of electronic equipment (such as horizontal and vertical screen switching, related games) , magnetometer posture calibration), vibration recognition-related functions (such as pedometer, knocking), etc.; the sensor 1605 can also include fingerprint sensors, pressure sensors, iris sensors, molecular sensors, gyroscopes, barometers, hygrometers, thermometers, Infrared sensors, etc., will not be repeated here.

The display unit 1606 is used to display information input by the user or information provided to the user. The display unit 1606 may include a display panel 16061, and the display panel 16061 may be configured in the form of a liquid crystal display (Liquid Crystal Display, LCD), an organic light-emitting diode (Organic Light-Emitting Diode, OLED), or the like.

The user input unit 1607 can be used to receive input number or character information, and generate key signal input related to user setting and function control of the electronic device. Specifically, the user input unit 1607 includes a touch panel 16071 and other input devices 16072 . The touch panel 16071, also referred to as a touch screen, can collect touch operations of the user on or near it (for example, the user uses any suitable object or accessory such as a finger, a stylus, etc. on the touch panel 16071 or near the touch panel 16071 operate). The touch panel 16071 may include two parts: a touch detection device and a touch controller. Other input devices 16072 may include, but are not limited to, physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, and joysticks, which will not be repeated here.

The interface unit 1608 is an interface for connecting an external device to the electronic device 1600 . For example, an external device may include a wired or wireless headset port, an external power (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device with an identification module, audio input/output (I/O) ports, video I/O ports, headphone ports, and more. The interface unit 1608 can be used to receive input from an external device (for example, data information, power, etc.) transfer data between devices.

The memory 1609 can be used to store software programs as well as various data. Memory 1609 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, at least one application program required by a function (such as a sound playback function, an image playback function, etc.); Data created by the use of mobile phones (such as audio data, phonebook, etc.), etc. In addition, the memory 1609 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage devices.

The processor 1610 is the control center of the electronic device. It uses various interfaces and lines to connect various parts of the entire electronic device. By running or executing software programs and/or modules stored in the memory 1609, and calling data stored in the memory 1609 , to perform various functions of the electronic equipment and process data, so as to monitor the electronic equipment as a whole. The processor 1610 may include one or more processing units; preferably, the processor 1610 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface and application programs, etc., and the modem The processor mainly handles wireless communication. It can be understood that the foregoing modem processor may not be integrated into the processor 1610 .

Those skilled in the art can understand that the electronic device 1600 can also include a power supply (such as a battery) for supplying power to various components, and the power supply can be logically connected to the processor 1610 through the power management system, so that the management of charging, discharging, and function can be realized through the power management system. Consumption management and other functions. The structure of the electronic device shown in FIG. 16 does not constitute a limitation to the electronic device. The electronic device may include more or fewer components than shown in the figure, or combine some components, or arrange different components, which will not be repeated here. .

It should be noted that, in this document, the term "comprising", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved. Functions are performed, for example, the described methods may be performed in an order different from that described, and various steps may also be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is better implementation. Based on such an understanding, the technical solution of the present application can be embodied in the form of a software product in essence or the part that contributes to the prior art, and the computer software product is stored in a storage medium (such as ROM/RAM, disk, CD) contains several instructions to enable a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in various embodiments of the present application.

The embodiments of the present application have been described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementations. The above-mentioned specific implementations are only illustrative and not restrictive. Under the inspiration of the application, many forms can be made without departing from the purpose of the application and the protection scope of the claims, all of which belong to the protection of the application.

Claims

An antenna system comprising:

electrically connected to the first antenna of the main board (100);

electrically connected to the second antenna of the motherboard (100), the first antenna and the second antenna are coupled and connected through a gap (S1); and

an isolating device (200), the isolating device (200) is used to reduce the coupling between the working frequency band of the first antenna and the working frequency band of the second antenna,

Wherein, the isolating device (200) includes a connection circuit board (201) and a first filtering network arranged on the connection circuit board (201), and the two ends of the connection circuit board (201) are respectively connected to the first one antenna and the second antenna.
The antenna system according to claim 1, wherein,

The connection circuit board (201) is arranged above the main board (100).
The antenna system according to claim 2, wherein,

The connecting circuit board (201) is arranged above the main board (100) through an insulating bracket (P1).
The antenna system according to claim 3, wherein,

The insulating support (P1) has a hollow portion to expose the main board (100) disposed under the insulating support (P1).
The antenna system according to any one of claims 1-4, wherein,

The connection circuit board (201) includes a plurality of first metal branches (L1), and the first filter network is connected in series between the plurality of first metal branches (L1).
The antenna system according to claim 5, wherein,

The first filtering network is configured to exhibit inductive characteristics near the low-frequency operating frequency band, and/or

The first filter network is set to present a high-impedance state near the high-frequency operating frequency band, and the electrical length of the first metal stub (L1) between the multiple sub-filter networks in the first filter network is the The half-wavelength of the high-frequency working frequency band, or the first metal branch (L1) connected to the feeder of the first antenna or the feeder of the second antenna is formed for the first antenna and/or the second antenna. Describe the radiation path of the working frequency band in the second antenna.
The antenna system according to claim 6, wherein,

The first filter network comprises a first sub-filter network (N1) and a second sub-filter network (N2) connected in series to each other.
The antenna system according to claim 7, wherein,

The first sub-filter network (N1) and the second sub-filter network (N2) are configured to exhibit inductance characteristics near a low-frequency operating frequency band.
The antenna system according to claim 7, wherein,

The first sub-filter network (N1) and the second sub-filter network (N2) are set to present a high-impedance state near the high-frequency operating frequency band, and the first sub-filter network (N1) and the second The electrical length of the first metal branch (L1) between the sub-filtering networks (N2) is set to be half the wavelength of the high-frequency working frequency band.
The antenna system according to claim 7, wherein,

The first sub-filter network (N1) is formed by a first inductor, and the second sub-filter network (N2) is formed by a parallel connection of a second inductor and a first capacitor.
The antenna system according to claim 6, wherein,

The first filtering network is composed of a third inductor and a fourth capacitor connected in parallel.
The antenna system according to claim 11, wherein,

The first filter network is set to exhibit inductance characteristics near the low-frequency operating frequency band.
The antenna system according to claim 11, wherein,

The first filter network is set to present a high-impedance state near the high-frequency operating frequency band, and the feeders connected to the feeder of the first antenna or the feeder of the second antenna located on both sides of the first filter network The first metal branch (L1) forms a radiation path for a working frequency band in the first antenna and/or the second antenna.
The antenna system according to claim 5, wherein,

The connection circuit board (201) further includes a plurality of second metal branches arranged between the first metal branches (L1) and the main return ground (G0) of the main board (100). A second filter network is connected in series between the second metal branches.
The antenna system according to any one of claims 6-14, wherein,

The isolation device (200) also includes a first switch (SW1), the first switch (SW1) is arranged in series with the sub-filter network in the first filter network to control whether the sub-filter network works .
An electronic device, comprising the antenna system according to any one of claims 1-15.