Antenna system and electronic equipment

Abstract

The utility model relates to an antenna system and electronic equipment, and belongs to the technical field of electronic equipment, the antenna system can comprise a first antenna, a second antenna and a third antenna, the coverage frequency band of the third antenna is lower than that of the first antenna, the feeding point of the third antenna is connected with the feeding point of the first antenna, and the feeding point of the second antenna is connected with the feeding point of the second antenna. The length of the third antenna is prolonged, and the performance of the third antenna is improved. A feeding point of the first antenna and a feeding point of the second antenna are arranged adjacently, and a coupling gap is arranged between the first antenna and the second antenna, so that the first antenna and the second antenna are distributed in a head-to-head mode (namely, the first antenna and the second antenna are relatively far physically), and electromagnetic interference between the first antenna and the second antenna can be effectively reduced. And a cross coupling electric field parasitic effect is generated between the first antenna and the second antenna, so that the performance of the first antenna and the second antenna is improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of electronic devices, and in particular, to an antenna system and an electronic device. BACKGROUND

[0002] In smart electronic devices such as mobile phones, tablets, wearable devices, etc., an antenna is an important component for signal transmission. With the continuous pursuit of performance of electronic devices by users, the integration of antennas in electronic devices is becoming higher and higher.

[0003] Taking a mobile phone as an example, a low-frequency antenna, a medium-high frequency antenna, and an NFC antenna are usually provided in the mobile phone to meet the communication function, global positioning system function, and near field communication (NFC) function.

[0004] However, with the increasing number of frequency bands and the number of antennas integrated in electronic devices, how to ensure the number and performance of antennas in limited space is a problem to be solved. INVENTION CONTENTS

[0005] To overcome the problems in the related art, the present disclosure provides an antenna system and an electronic device.

[0006] According to a first aspect of an embodiment of the present disclosure, an antenna system is provided, comprising:

[0007] a first antenna comprising a first feed point and a first return point arranged at intervals along an extension direction of the first antenna;

[0008] a second antenna comprising a second feed point and a second return point arranged at intervals, a coupling gap being provided between the second antenna and the first antenna, and the first feed point and the second feed point being arranged adjacent to each other;

[0009] a third antenna comprising a third feed point, the third feed point being electrically connected to the first feed point, and the third antenna having a lower coverage frequency band than the first antenna.

[0010] In a possible implementation manner, the third antenna is an NFC antenna.

[0011] In a possible implementation manner, the antenna system is applied to an electronic device, the electronic device comprising at least a metal frame and a metal middle plate, the metal frame being arranged around the outside of the metal middle plate; wherein,

[0012] the first antenna and the second antenna are both located in the metal frame, and the third antenna is located in the metal middle plate.

[0013] In a possible implementation, the coverage frequency range of the first antenna includes a first frequency range and a second frequency range, and the second frequency range is higher than the first frequency range.

[0014] In a possible implementation, the first frequency range is an LB frequency range, and the second frequency range is an MHB frequency range.

[0015] In a possible implementation, the first antenna is a cellular antenna.

[0016] In a possible implementation, further comprising a resonant circuit, the resonant circuit includes a first end and a second end, the first end of the resonant circuit is connected to the first ground point, and the second end of the resonant circuit is grounded.

[0017] The resonant circuit is configured to be open in the coverage frequency range of the third antenna, inductive in the first frequency range, and capacitive in the second frequency range.

[0018] In a possible implementation, the resonant circuit includes a first circuit and a second circuit connected in parallel; wherein,

[0019] The first circuit includes a first capacitor.

[0020] The second circuit includes a second capacitor and an inductor connected in series, and the capacitance of the second capacitor is greater than the capacitance of the second capacitor.

[0021] In a possible implementation, the second antenna is a GPS navigation antenna.

[0022] In a possible implementation, the coverage frequency range of the second antenna is an L5 frequency range.

[0023] In a possible implementation, the metal frame includes a top frame and a side frame, and the side frame is located at one end of the extension direction of the top frame.

[0024] A top corner portion is formed between the top frame and the side frame; wherein,

[0025] The first antenna is located in the top frame, the second antenna is located in the top corner portion, and the coupling gap is formed between the top frame and the top corner portion.

[0026] In a possible implementation, the distance between the first feeding point and the first ground point is between 10 mm and 16 mm.

[0027] In a possible implementation, the distance between the first feeding point and one end of the first antenna close to the coupling gap is between 12 mm and 17 mm.

[0028] In a possible implementation, a distance between the coupling gap and the second feeding point is less than or equal to 1 mm.

[0029] In a possible implementation, a distance between the second feeding point and an end of the second antenna close to the coupling gap is between 2.5 mm and 3.5 mm.

[0030] According to a second aspect of the embodiments of the present disclosure, an electronic device is provided, including at least a metal middle plate, a metal frame, and the antenna system as described above.

[0031] The first antenna and the second antenna of the antenna system are arranged on the metal frame.

[0032] The third antenna of the antenna system is arranged on the metal middle plate.

[0033] In a possible implementation, the metal frame includes a top frame and a side frame, and the side frame is located at one end of the top frame in an extension direction of the top frame.

[0034] A top corner portion is formed between the top frame and the side frame.

[0035] The first antenna is located on the top frame, the second antenna is located on the top corner portion, and a coupling gap is formed between the top frame and the top corner portion.

[0036] The technical solutions provided by the embodiments of the present disclosure can have the following beneficial effects:

[0037] The antenna system and the electronic device provided by the present disclosure can have the following beneficial effects: the third feeding point of the third antenna is connected with the first feeding point of the first antenna, and the frequency range of the third antenna is set to be lower than that of the first antenna. Since a lower frequency requires a longer antenna, the first antenna can be used as a part of the third antenna, which can increase the length and coverage area of the third antenna, and thus improve the antenna performance of the third antenna. When the third antenna is an NFC antenna, the card swiping area of the third antenna can be enlarged. The first antenna is arranged on the metal frame. Since the metal frame has a large coverage range when used as an antenna, arranging the first antenna on the metal frame and connecting the third feeding point with the first feeding point of the first antenna can also improve the angle coverage range of the third antenna and improve the card swiping sensitivity.

[0038] By adjacently arranging the first feeding point of the first antenna and the second feeding point of the second antenna, the first antenna and the second antenna can be arranged in a head-to-head manner (i.e., physically far apart), which can effectively reduce electromagnetic interference between the first antenna and the second antenna and help ensure signal integrity and performance of each antenna in its operating frequency band. By arranging the coupling gap between the first feeding point and the second feeding point, the first antenna can generate a cross-coupling electric field parasitic effect in the coverage frequency band of the second antenna, and the second antenna can also generate a cross-coupling electric field parasitic effect in the coverage frequency band of the first antenna, that is, the first antenna and the second antenna can cross-coupling resonate at different frequencies, thereby improving the radiation efficiency of the first antenna and the second antenna.

[0039] By connecting the resonant circuit at the first return point of the first antenna and arranging the resonant circuit to have a break characteristic in the coverage frequency band of the third antenna, the impedance of the resonant circuit is very high at this time, which is equivalent to extending the length of the third antenna. Since a lower frequency requires a longer antenna, this can improve the integrity and performance of NFC communication. In addition, the resonant circuit can effectively isolate the NFC signal and prevent the third antenna from interfering with other frequency bands (LB and MHB) of the first antenna.

[0040] By arranging the resonant circuit to have an inductive characteristic in the first frequency band, the resonant circuit provides high impedance to the signal of the LB frequency band, which is equivalent to extending the length of the first antenna, thereby improving the performance of the first antenna in the LB frequency band. In addition, the resonant circuit can be used to tune and match the impedance of the antenna, improving the transmission efficiency and reception sensitivity of the signal.

[0041] By arranging the resonant circuit to have a capacitive characteristic in the MHB frequency band, the resonant circuit provides low impedance to the signal of the MHB frequency band at this time, allowing the signal of the MHB frequency band to pass through. This characteristic can be used to enhance the response of the antenna in the MHB frequency band, and the resonant circuit can help filter out unwanted high-frequency noise or harmonics, enhancing the purity and quality of the signal.

[0042] By arranging the first antenna at the top bezel and the second antenna at the top corner, the physical space of the electronic device can be effectively utilized, avoiding physical overlap and interference between the first antenna and the second antenna, while meeting the requirements of multiple frequency bands and multiple functions. In addition, by arranging the first antenna at the top bezel, the first antenna can be located at the top of the entire electronic device, which has less physical obstruction, thereby improving the signal reception and transmission capability of the first antenna and facilitating better coverage of the entire LB and MHB frequency bands by the first antenna. By arranging the second antenna at the top corner, the second antenna can have a good field of view, thereby optimizing the performance of the received signal of the second antenna. When the second antenna is a GPS antenna, the reception of GPS signals can be optimized, because GPS signals usually come from satellites in the sky, and the antenna needs to have a good field of view.

[0043] It should be understood that the general description and detailed description, which follows, are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0044] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and serve to explain the principles of the present disclosure, in which, like reference numerals represent corresponding elements throughout the several views of the drawings.

[0045] Figure 1 is a structural schematic diagram of an electronic device according to some embodiments of the present disclosure;

[0046] Figure 2 is a split structural schematic diagram of an electronic device according to some embodiments of the present disclosure;

[0047] Figure 3 is a structural schematic diagram of an antenna system in an electronic device according to some embodiments of the present disclosure;

[0048] Figure 4 is a current distribution schematic diagram of an antenna system of an electronic device when operating in the MHB frequency band according to some embodiments of the present disclosure;

[0049] Figure 5 is a current distribution schematic diagram of an antenna system of an electronic device when operating in the L5 frequency band according to some embodiments of the present disclosure;

[0050] Figure 6 is an S11 schematic diagram of electrically parasitic cross-coupling resonance of an antenna system of an electronic device according to some embodiments of the present disclosure;

[0051] Figure 7 is an efficiency schematic diagram of electrically parasitic cross-coupling resonance of an antenna system of an electronic device according to some embodiments of the present disclosure;

[0052] Figure 8 is a schematic diagram of a radio frequency circuit of an antenna system of an electronic device according to some embodiments of the present disclosure.

[0053] REFERENCE NUMERALS:

[0054] 200 - mobile phone; 210 - display screen; 211 - first aperture;

[0055] 220 - middle frame; 221 - metal middle plate; 222 - metal frame;

[0056] 2221 - top frame; 2222 - bottom frame; 2223 - left side frame;

[0057] 2224 - right side frame; 230 - circuit board; 223 - top corner portion;

[0058] 240 - battery; 250 - battery cover; 251 - second opening;

[0059] 260 - front camera module; 270 - rear camera module;

[0060] 100 - antenna system; 110 - first antenna; 111 - first feed point;

[0061] 112 - first return point; 120 - second antenna; 121 - second feed point;

[0062] 122 - second return point; 130 - third antenna; 131 - third feed point;

[0063] 140 - coupling gap; 150 - total ground point; 160 - resonant circuit;

[0064] 161 - first end; 162 - second end; 163 - first circuit;

[0065] 1631 - first capacitor; 164 - second circuit; 1641 - second capacitor;

[0066] 1642 - inductor. DETAILED DESCRIPTION

[0067] Some embodiments of the present disclosure will now be described in detail in connection with the annexed drawings. Wherever possible, corresponding like reference numbers will be used in the drawings and description of the application to refer to like components / parts. Changes in the size of components / parts do not necessarily indicate a change in dimensions and nature of the components / parts. The description of the method, device and / or system described herein is merely exemplary in nature and is in no way intended to limit the application, limit the application to any specific applications, or suggest that the application would not be operative / functional with, or without, the preferred embodiments as described herein. The description herein of a process, device and / or system should not be interpreted as a limitation to any specific step, order, or sequence of steps, or to the absolute specificity of the process, device and / or system.

[0068] The implementations described below in some embodiments of the present disclosure are not meant to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0069] Some embodiments of the present disclosure provide an electronic device, which can be an electronic device employing one or more of the following communication technologies: Bluetooth (BT) communication technology, global positioning system (GPS) communication technology, wireless fidelity (WiFi) communication technology, near field communication (NFC) communication technology, global system for mobile communications (GSM) communication technology, wideband code division multiple access (WCDMA) communication technology, long term evolution (LTE) communication technology, 5G communication technology, and other future communication technologies.

[0070] Embodiments of the present disclosure provide an electronic device, which can include but is not limited to a mobile phone, a tablet computer, a notebook computer, a car, a smart speaker, a smart door lock, a router, a customer premise equipment (CPE), an internet of things (IOT) device, an ultra-mobile personal computer (UMPC), a handheld computer, a walkie-talkie, a netbook, a point of sales (POS) machine, a personal digital assistant (PDA), a wearable device, a virtual reality device, a wireless U disk, a Bluetooth speaker / earphone, or a vehicle-mounted, a driving recorder, a security device, and other mobile or fixed terminals with an antenna.

[0071] Figure 1 is a schematic diagram of the overall structure of an electronic device according to some embodiments of the present disclosure. Figure 2 is a schematic diagram of the split structure of an electronic device according to some embodiments of the present disclosure.

[0072] As shown in Figure 1 and Figure 2 in some embodiments of the present disclosure, an electronic device 100 is taken as an example of a mobile phone.

[0073] Referring to Figure 1As shown, the mobile phone 200 provided by the embodiments of the present application can be a curved screen mobile phone or a flat screen mobile phone, can be a straight mobile phone or a folding screen mobile phone, and the flat screen mobile phone is taken as an example for description in the embodiments of the present application. Figure 1 and Figure 2 The overall structure and split structure of the mobile phone 200 are respectively shown, and the display screen 210 of the mobile phone 200 provided by the embodiments of the present application can be a drop screen, a notch screen, a full screen or a hole screen (see Figure 1 As shown, for example, the first opening 211 is arranged on the display screen 210, and the following description is taken as an example of the hole screen.

[0074] As shown, Figure 2 The mobile phone 200 can include the display screen 210, the middle frame 220, the battery cover 250 and the battery 240 between the middle frame 220 and the battery cover 250, wherein the battery 240 can be arranged on one side of the middle frame 220 facing the battery cover 250 (as shown Figure 2 As shown, the battery 240 can be arranged on one side of the middle frame 220 facing the battery cover 250 (as shown

[0075] In some embodiments of the present disclosure, the mobile phone 200 can further include a circuit board 230, wherein the circuit board 230 can be arranged on the middle frame 220, for example, the circuit board 230 can be arranged on one side of the middle frame 220 facing the battery cover 250 (as shown Figure 2 As shown, the circuit board 230 can be arranged on one side of the middle frame 220 facing the display screen 210, and the display screen 210 and the battery cover 250 are respectively arranged on two sides of the middle frame 220.

[0076] The battery 240 can be connected to the charging management module and the circuit board 230 through the power management module, the power management module receives the input of the battery 240 and / or the charging management module, and supplies power for the processor, the internal memory, the external memory, the display screen 210, the camera module and the communication module, etc. The power management module can also be used to monitor the parameters such as the capacity of the battery 240, the cycle number of the battery 240, the health status (leakage, impedance) of the battery 240, etc. In other embodiments, the power management module can also be arranged in the processor of the circuit board 230. In some other embodiments, the power management module and the charging management module can also be arranged in the same device.

[0077] When the mobile phone 200 is a flat-screen mobile phone 200, the display screen 210 can be an organic light-emitting diode (OLED) display screen or a liquid crystal display (LCD). When the mobile phone 200 is a curved-screen mobile phone 200, the display screen 210 can be an OLED display screen.

[0078] With reference to the continuation of the description Figure 2 As shown in the figure, the middle frame 220 can include a metal middle plate 221 and a metal frame 222, and the metal frame 222 is arranged around the outer periphery of the metal middle plate 221. Generally, the metal frame 222 can include a top frame 2221, a bottom frame 2222, a left side frame 2223, and a right side frame 2224, and the top frame 2221, the bottom frame 2222, the left side frame 2223, and the right side frame 2224 form a square ring structure of the metal frame 222.

[0079] The material of the metal middle plate 221 and the metal frame 222 includes but is not limited to aluminum plate, aluminum alloy, stainless steel, steel-aluminum composite die-casting plate, titanium alloy, or magnesium alloy, etc. The metal middle plate 221 and the metal frame 222 can be connected by clamping, welding, bonding, or one-piece forming, or the metal middle plate 221 and the metal frame 222 can be fixedly connected by injection molding.

[0080] With reference to the continuation of the description Figure 2 As shown in the figure, the top frame 2221 and the bottom frame 2222 are oppositely arranged, and the left side frame 2223 and the right side frame 2224 are oppositely arranged. The top frame 2221 is connected with one end of the left side frame 2223 and one end of the right side frame 2224 in a rounded corner manner, so as to form a top corner portion 223 between the top frame 2221 and the left side frame 2223 and the right side frame 2224, respectively. The bottom frame 2222 is connected with the other end of the left side frame 2223 and the other end of the right side frame 2224 in a rounded corner manner, so as to form a bottom corner portion between the bottom frame 2222 and the left side frame 2223 and the right side frame 2224, respectively.

[0081] Thus, the top frame 2221, the bottom frame 2222, the left side frame 2223, and the right side frame 2224 together form a rounded rectangular area. The battery cover grounding surface is arranged in the rounded rectangular area and is connected with the top frame 2221, the bottom frame 2222, the left side frame 2223, and the right side frame 2224, respectively. It can be understood that the battery cover grounding surface can be the battery cover 250 of the mobile phone 200.

[0082] It should be noted that the left side frame 2223 and the right side frame 2224 are side frames.

[0083] The battery cover 250 can be a metal battery cover, a glass battery cover, a plastic battery cover, or a ceramic battery cover. In this embodiment, the material of the battery cover 250 is not limited and is not limited to the above examples.

[0084] It should be noted that in some examples, the battery cover 250 of the mobile phone 200 can be connected with the metal frame 222 to form a unibody battery cover. For example, the mobile phone 200 can include a display screen 210, a metal middle plate 221, and a battery cover. The battery cover can be a battery cover formed by the metal frame 222 and the battery cover 250 in a unibody manner, so that the circuit board 230 and the battery 240 are located in a space surrounded by the metal middle plate 221 and the battery cover.

[0085] In addition, in a possible implementation, the battery cover 250 can further be provided with a second opening hole 251 as a light transmission area of the rear camera module 270. Similarly, the first opening hole 211 on the display screen 210 can also be used as a light transmission area of the front camera module 260.

[0086] To achieve the shooting function, the mobile phone 200 can further include a camera module. Continuing to refer to Figure 2 As shown, the camera module can include a front camera module 260 and a rear camera module 270. The rear camera module 270 can be arranged on the side of the metal middle plate 221 facing the battery cover 250. The display screen 210 is provided with a first opening hole 211, and the lens of the rear camera module 270 corresponds to the first opening hole 211. The battery cover 250 can be provided with a mounting hole for mounting part of the rear camera module 270, of course, the rear camera module 270 can also be mounted on the side of the battery cover 250 facing the metal middle plate 221. The front camera module 260 can be arranged on the side of the metal middle plate 221 facing the display screen 210, or the front camera module 260 can be arranged on the side of the metal middle plate 221 facing the battery cover 250, or the front camera module 260 can also be arranged on the side of the battery cover 250 facing the display screen 210. The metal middle plate 221 is provided with an opening for exposing the lens end of the front camera module 260.

[0087] In this embodiment, the arrangement positions of the front camera module 260 and the rear camera module 270 include but are not limited to the above description. In some embodiments, the number of the front camera module 260 and the rear camera module 270 arranged in the mobile phone 200 can be one or N, and N is a positive integer greater than 1.

[0088] It can be understood that the structure illustrated in the embodiments of the present application does not constitute a specific limitation on the electronic device. In other embodiments of the present application, the electronic device can include more or fewer components than the illustration, or combine certain components, or split certain components, or different arrangement of components. The illustrated components can be implemented in hardware, software, or a combination of software and hardware.

[0089] To further increase the achievable functions of the mobile phone 200, an antenna can be provided on the mobile phone 200. Due to the increasing demand for data transmission rate, the development of multi-antenna technology is accelerated. Currently, the specifications of dual-antenna, triple-antenna, and quadruple-antenna are gradually put on the agenda.

[0090] Specifically, due to the limited space of the mobile phone, several adjacent antennas operating in the same frequency band are placed in the limited space of the terminal. Due to the close distance between the antennas, mutual coupling interference problems occur, which causes the isolation between the multiple antennas to deteriorate. Therefore, how to ensure the number and performance of the antennas under the limited space is a problem to be solved.

[0091] Based on this, the embodiments of the present application provide a new antenna system, which can be applied to the above-mentioned electronic device (for example, the mobile phone 200), which at least includes a metal frame and a metal middle plate, and the metal frame is arranged outside the metal middle plate. Wherein, the antenna system includes a first antenna, a second antenna and a third antenna, the first antenna includes a first feed point and a first return point which are arranged at intervals along the extension direction of the first antenna. The second antenna includes a second feed point and a second return point which are arranged at intervals, and a coupling gap is arranged between the first antenna and the second antenna, and the first feed point and the second feed point are arranged adjacent to each other. The third antenna includes a third feed point, the third feed point is electrically connected with the first feed point, and the coverage frequency band of the third antenna is lower than that of the first antenna. The first antenna and the second antenna are located in the metal frame, and the third antenna is located in the metal middle plate.

[0092] The present disclosure can meet the design of multiple antennas in a small space to achieve high performance. In this way, the antenna system can be realized in a limited design space, which effectively saves the antenna design space inside the electronic device to a certain extent, and can reduce the influence on other antennas, that is, reduce the current coupling between antennas to improve the isolation, thereby avoiding affecting the impedance matching and radiation characteristics of other antennas.

[0093] It should be noted that the antenna system provided by the present application is applicable to electronic devices using one or more of the following communication technologies: for example, long term evolution (LTE) communication technology, Wi-Fi communication technology, 5G communication technology, SUB-6G communication technology and other future MIMO communication technologies.

[0094] The following describes the specific structure of the antenna system using different embodiments as examples and in conjunction with the accompanying drawings (the following embodiments do not emphasize the requirements of the communication network, but only describe the operating characteristics of the antenna system in terms of frequency).

[0095] Figure 3 This is a schematic block diagram of an antenna system according to some embodiments of the present disclosure.

[0096] like Figure 3 As shown, this application embodiment provides an antenna device 100, which can be applied to electronic devices (such as mobile phones 200 or computers). The electronic devices include at least a metal middle plate 221 and a metal frame 222, with the metal frame 222 surrounding the outside of the metal middle plate 221.

[0097] See also Figure 3 As shown, the antenna system 100 may include a first antenna 110, a second antenna 120, and a third antenna 130, wherein the first antenna 110 includes antennas extending along the direction of the first antenna 110 (…). Figure 3 The first antenna 110 has two feed points 111 and 112 spaced apart (in the X direction). The second antenna 120 includes a second feed point 121 and a second return point 122 spaced apart. A coupling gap 140 is provided between the second antenna 120 and the first antenna 110, and the first feed point 111 and the second feed point 121 are arranged adjacent to each other. The third antenna 130 includes a third feed point 131, which is electrically connected to the first feed point 111. The coverage frequency band of the third antenna 130 is lower than that of the first antenna 110. The first antenna 110 and the second antenna 120 are both located on the metal frame 222, and the third antenna 130 is located on the metal middle plate 221.

[0098] The antenna system 100 and electronic device disclosed herein connect the third feed point 131 of the third antenna 130 to the first feed point 111 of the first antenna 110, and set the coverage frequency band of the third antenna 130 to be lower than that of the first antenna 110. Since the lower the frequency, the longer the antenna length is required, connecting the third feed point 131 of the third antenna 130 to the first feed point 111 of the first antenna 110 allows the first antenna 110 to be used as part of the wiring of the third antenna 130. This increases the length and coverage area of ​​the third antenna 130, thereby improving the antenna performance of the third antenna 130.

[0099] For example, the third feed point 131 of the third antenna 130 can be connected to the motherboard (not shown in the figure) via a spring clip, and then connected to the first feed point 111 via the PCB trace of the motherboard. In this embodiment, the routing of the third antenna 130 is not further limited.

[0100] For example, the first feeding point 111, the first return point 112, the second feeding point 121 and the second return point 122 all extend towards the inside of the metal frame 222.

[0101] In the embodiments of the present disclosure, continuing to refer to Figure 3 As shown, the metal frame 222 can include a top frame 2221 and side frames, the side frames including a left side frame 2223 and a right side frame 2224, the left side frame 2223 and the right side frame 2224 being oppositely arranged and respectively located at two ends of the top frame 2221, the top frame 2221 and one end of the left side frame 2223 and one end of the right side frame 2224 being respectively connected in a rounded corner manner, so that a top corner portion 223 is formed between the left side frame 2223 and the top frame 2221, and a top corner portion 223 is also formed between the right side frame 2224 and the top frame 2221. Wherein, the first antenna 110 is located at the top frame 2221, the second antenna 120 is located at the top corner portion 223, and a coupling gap 140 is formed between the top frame 2221 and the top corner portion 223.

[0102] In some embodiments of the present disclosure, the first antenna 110 and the second antenna 120 can be metal frame 222 antennas. That is, different parts of the metal frame 222 respectively serve as the first antenna 110 and the second antenna 120.

[0103] For example, the coverage frequency range of the first antenna 110 includes a first frequency range and a second frequency range, and the second frequency range is higher than the first frequency range. For example, the first frequency range can be a low band (LB) frequency range, and the second frequency range can be a mid high band (MHB) frequency range.

[0104] It should be noted that the low band (LB) generally refers to the frequency spectrum with a frequency lower than 1 GHz. These frequency bands include traditional mobile communication frequency bands such as 700 MHz, 800 MHz and 900 MHz, etc. The mid high band (MHB) generally refers to the frequency spectrum with a frequency between 1 GHz and 6 GHz. These frequency bands include many frequency bands used for 4G LTE and 5G NR, such as 1800 MHz, 2100 MHz, 2300 MHz, 2600 MHz and 3.5 GHz, etc.

[0105] For example, the first antenna 110 can be a cellular antenna. By setting the first antenna 110 as a cellular antenna, and covering the LB frequency band and the MHB frequency band, where the low frequency band (LB frequency band) is usually used for 2G, 3G and 4G LTE networks. These frequency bands have good propagation characteristics, can cover a larger area and penetrate buildings, so they are suitable for wide-area coverage and indoor communication. The medium-high frequency band (MHB frequency band) is widely used in 4G LTE and 5G networks. These frequency bands provide higher bandwidth, suitable for high-speed data transmission and high-capacity applications.

[0106] For example, the third antenna 130 can be an NFC antenna. The NFC antenna can meet the NFC communication needs of the electronic device, and can realize the identification and data exchange functions between the electronic device and other compatible devices, such as can be used for consumer card swiping, access card swiping, identity recognition, anti-counterfeiting and other applications.

[0107] It should be noted that the NFC antenna can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology and other technologies.

[0108] By setting the third antenna 130 as an NFC antenna, and connecting the third feeding point 131 of the third antenna 130 with the first feeding point 111 of the first antenna 110, the card swiping area of the third antenna 130 can be expanded. By setting the first antenna 110 on the metal frame 222, since the metal frame 222 has a larger coverage range as the radiation angle of the antenna, by setting the first antenna 110 on the metal frame 222 and connecting the third feeding point 131 with the first feeding point 111 of the first antenna 110, the angle coverage range of the third antenna 130 can also be improved, and the card swiping sensitivity can be improved.

[0109] For example, the second antenna 120 can be a GPS navigation antenna. The coverage frequency band of the second antenna 120 can be L5 frequency band.

[0110] It should be noted that the L5 frequency band of GPS is a higher frequency band relative to other GPS signal frequency bands. Specifically, the center frequency of the L5 frequency band is 1176.45 MHz. The L5 signal of GPS can improve the positioning accuracy and reliability, especially in aviation and other applications that require high-precision positioning. The L5 frequency band has higher bandwidth and stronger anti-interference capability, which enables it to provide better performance in multipath environments (such as urban canyons or forests).

[0111] Of course, in other embodiments, the coverage frequency band of the second antenna 120 can also be other frequency bands, such as L1 frequency band, L2 frequency band, etc.

[0112] It should be noted that the working frequency of NFC is low, and a certain length of the frame is needed to improve the card swiping induction ability, and therefore the NFC hopes that the length from the feeding point to the return point (the grounding point) is as long as possible. The low frequency and the medium-high frequency covered by the first antenna 110 have different requirements for the length from the antenna feeding point to the return point, and the physical length corresponding to the electrical length of different frequencies is as follows: the length of the antenna for the low frequency is about 40 mm, and the length of the antenna for the medium-high frequency is about 21 mm. The GPS L5 frequency band is a higher frequency band relative to other GPS signal frequency bands, and the corresponding antenna length is shorter.

[0113] In the embodiment of the present application, by arranging the first antenna 110 at the top frame 2221 and arranging the second antenna 120 at the top corner portion 223, the physical space of the electronic device can be effectively utilized, the physical overlap and interference between the first antenna 110 and the second antenna 120 can be avoided, and the requirements of multiple frequency bands and multiple functions can be met. In addition, by arranging the first antenna 110 at the top frame 2221, the first antenna 110 can be located at the top of the whole machine of the electronic device. Since the top has less physical obstruction, the signal receiving and transmitting capability of the first antenna 110 is improved, and the first antenna 110 can better cover the entire LB and MHB frequency bands. By arranging the second antenna 120 at the top corner portion 223, the second antenna 120 can have a good field of view, and the performance of the received signal of the second antenna 120 can be optimized. When the second antenna 120 is a GPS antenna, the reception of the GPS signal can be optimized. Since the GPS signal usually comes from a satellite in the sky, the antenna needs to have a good field of view.

[0114] In the embodiment of the present application, the length of the first antenna 110 is greater than the length of the second antenna 120.

[0115] Figure 4 FIG. 2 is a schematic diagram of the current distribution of the antenna system 100 of the electronic device according to some embodiments of the present application when the antenna system 100 works in the MHB frequency band. Figure 5 FIG. 3 is a schematic diagram of the current distribution of the antenna system 100 of the electronic device according to some embodiments of the present application when the antenna system 100 works in the L5 frequency band.

[0116] By adjacently arranging the first feeding point 111 of the first antenna 110 and the second feeding point 121 of the second antenna 120, the first antenna 110 and the second antenna 120 can be arranged in a head-to-head manner (i.e., physically relatively far away from each other), and the electromagnetic interference between them can be effectively reduced, which helps to ensure the signal integrity and performance of each antenna in its working frequency band. The first antenna 110 and the second antenna 120 are coupled to each other through the coupling gap. For the first antenna 110, the second antenna 120 with a shorter length can generate a cross-coupling electric field parasitic effect in the B41 frequency band in the MHB frequency band of the first antenna 110, as shown in FIG. 4.Figure 4 As shown, a large amount of current is distributed on both the first antenna 110 and the second antenna 120 in the B41 band of the second frequency band, indicating that the second antenna 120 is excited in the operating frequency band of the first antenna 110 and can radiate signals, thereby improving the radiation efficiency of the first antenna 110 in the operating frequency band.

[0117] Similarly, for the second antenna 120, the longer first antenna 110 can generate cross-coupled electric field parasitic effects in the L5 band of the second antenna 120, see [link to relevant documentation]. Figure 5 As shown, a large amount of current is distributed on both the first antenna 110 and the second antenna 120 in the L5 frequency band. In other words, the first antenna is also excited in the operating frequency band of the second antenna and can radiate signals, thereby improving the radiation efficiency of the second antenna's operating frequency band.

[0118] It should be noted that, Figure 4 and Figure 5 The arrows in the diagram represent electrons. The direction of the arrows indicates the direction of the electrons, and the number of arrows indicates the electron distribution density. The higher the electron distribution density, the higher the radiation efficiency. Figure 4 and Figure 5 This diagram is only intended to illustrate the parasitic effect of the cross-coupled electric field when the first and second antennas operate at different frequencies. It serves as a reference diagram and is not intended to be included within the scope of protection of this application.

[0119] Figure 6 and Figure 7 The figures show S11 and efficiency curves corresponding to the coupling current. It can be seen that the first antenna in the antenna system exhibits improved radiation efficiency at different frequencies of cross-coupling resonance between the first antenna 110 and the second antenna 120.

[0120] It should be noted that, Figure 6 Point p represents the resonant point within the operating frequency band of the second antenna, and point q represents the resonant point generated by the cross-coupling of the first antenna within the operating frequency band of the second antenna. Compared to having only one resonant point, the resonance of the first antenna can enhance the radiation efficiency of the second antenna's operating frequency band. Point j represents the MHB band resonant point of the first antenna itself within its operating frequency band, and point g represents the resonant point generated by the cross-coupling of the second antenna within the B41 band of the first antenna's MHB band. Compared to having only one resonant point, the resonance of the second antenna can enhance the radiation efficiency of the first antenna's operating frequency band. The generation of resonance enhances radiation efficiency.

[0121] It should be noted that, Figure 7m represents the overall radiation efficiency of the antenna system, s represents a resonance point in the operating frequency band of the second antenna, k represents a resonance point generated by the cross coupling of the first antenna in the operating frequency band of the second antenna, if there is no cross coupling, the resonance at the k point does not exist, so that a resonance point is added, and the overall radiation efficiency of the antenna can be improved. n represents the total efficiency of the antenna system. f represents the position of the MHB frequency band resonance point of the first antenna itself in the operating frequency band, it can be seen that the total efficiency of the antenna system at the f point is relatively high, t represents the position of the resonance point generated by the cross coupling of the second antenna in the B41 frequency band of the MHB frequency band of the first antenna, it can be seen that the total efficiency of the antenna system at the t point is also relatively high, compared with the resonance of the first antenna at the f point, the cross coupling resonance of the second antenna at the t point strengthens the total efficiency of the antenna system. That is, through the cross coupling of the first antenna and the second antenna in different frequency bands, the total efficiency of the antenna system in different radiation frequency bands can be improved.

[0122] Figure 6 and Figure 7 Just to illustrate the cross coupling electric field parasitic effect of the first antenna and the second antenna working at different frequencies, only as a reference diagram of an effect, not as the protection scope of the embodiments of the present application.

[0123] It should be noted that the B41 frequency band refers to a frequency band in the LTE (Long Term Evolution) mobile communication technology, mainly used for 4G network. Specifically, the frequency range of the B41 frequency band is 2496 MHz to 2690 MHz, which belongs to the MHB frequency band (medium-high frequency band).

[0124] In a possible implementation, the distance a between the first feeding point 111 and the first return point 112 is between 10 mm and 16 mm. For example, the distance a between the first feeding point 111 and the first return point 112 can be 10 mm, 10.5 mm, 11 mm, 11.3 mm, 11.8 mm, 12.5 mm, 13 mm, 13.5 mm, 13.8 mm, 14 mm, 14.5 mm, 15 mm, 15.8 mm, 16 mm, etc. In the embodiments of the present application, the distance a between the first feeding point 111 and the first return point 112 is not limited further.

[0125] The antenna system 100 can further include a common ground point 150, wherein the first antenna 110, the second antenna 120 and the third antenna 130 are all connected to the common ground point 150 (connection lines are not shown in the figure). The distance b from the first feeding point 111 to the common ground point 150 can be greater than or equal to the distance a between the first feeding point 111 and the first return point 112. For example, the distance b from the first feeding point 111 to the common ground point 150 is 15.8 millimeters, and the distance a between the first feeding point 111 and the first return point 112 is 11.3 millimeters. Of course, in other embodiments, the distance b from the first feeding point 111 to the common ground point 150 and the distance a between the first feeding point 111 and the first return point 112 can also be other values, and in the embodiments of the present application, the distance b from the first feeding point 111 to the common ground point 150 and the distance a between the first feeding point 111 and the first return point 112 are not limited further.

[0126] In a possible implementation, the distance c between the first feeding point 111 and the end of the first antenna 110 close to the coupling gap 140 is between 12 millimeters and 17 millimeters. For example, the distance c between the first feeding point 111 and the end of the first antenna 110 close to the coupling gap 140 can be 12 millimeters, 12.5 millimeters, 13 millimeters, 13.5 millimeters, 14 millimeters, 14.5 millimeters, 15 millimeters, 15.5 millimeters, 16 millimeters, 16.5 millimeters, 17 millimeters, etc., and in the embodiments of the present application, the distance c between the first feeding point 111 and the end of the first antenna 110 close to the coupling gap 140 is not limited further.

[0127] In a possible implementation, the distance between the coupling gaps 140 is less than or equal to 1 millimeter. For example, the distance between the coupling gaps 140 can be 1 millimeter, 0.9 millimeter, 0.8 millimeter, 0.7 millimeter, etc., and of course, in some embodiments, the distance between the coupling gaps 140 can also be greater than 1 millimeter, for example, 1.1 millimeter, 1.2 millimeter, etc., and in the embodiments of the present application, the distance between the coupling gaps 140 is not limited further.

[0128] In a possible implementation, the distance d from the second feeding point 121 to the end of the second antenna 120 close to the coupling gap 140 is between 2.5 mm and 3.5 mm. For example, the distance d from the second feeding point 121 to the end of the second antenna 120 close to the coupling gap 140 can be 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, etc. Of course, in some embodiments, the distance d from the second feeding point 121 to the end of the second antenna 120 close to the coupling gap 140 can also be other values, and in the embodiments of the present application, the distance d from the second feeding point 121 to the end of the second antenna 120 close to the coupling gap 140 is not limited further.

[0129] In a possible implementation, the distance e from the second feeding point 121 to the side frame (the right side frame 2224) can be between 9 mm and 11 mm. For example, the distance e from the second feeding point 121 to the side frame can be 9 mm, 9.2 mm, 9.4 mm, 9.6 mm, 9.8 mm, 10 mm, 10.2 mm, 10.4 mm, 10.6 mm, 10.8 mm, 11 mm, etc. In the embodiments of the present application, the distance e from the second feeding point 121 to the side frame is not limited further.

[0130] In a possible implementation, the antenna system 100 can further include a resonant circuit 160, as shown in Figure 8 The resonant circuit 160 includes a first end 161 and a second end 162. The first end 161 of the resonant circuit 160 is connected to the first return point 112, and the second end 162 of the resonant circuit 160 is grounded, i.e., connected to the general ground point 150. The resonant circuit 160 is used to be open in the coverage frequency band of the third antenna 130, and has inductive characteristics in the first frequency band and capacitive characteristics in the second frequency band.

[0131] By connecting the resonant circuit 160 at the first return point 112 of the first antenna 110 and setting the resonant circuit 160 to have open characteristics in the coverage frequency band of the third antenna 130, the impedance of the resonant circuit 160 is very high at this time, which is equivalent to extending the length of the third antenna 130. Since the required antenna length is larger at lower frequencies, this can improve the integrity and performance of NFC communication. In addition, this can effectively isolate the NFC signal of the resonant circuit 160 and prevent the third antenna 130 from interfering with other frequency bands (LB and MHB) of the first antenna 110.

[0132] By setting the resonant circuit 160 to have inductive characteristics in the first frequency band, and further providing high impedance to the signal in the LB frequency band, most of the power of the antenna can be radiated, which is equivalent to extending the length of the first antenna 110, and further improving the performance of the first antenna 110 in the LB frequency band. In addition, the resonant circuit 160 can be used to tune and match the impedance of the antenna, and improve the transmission efficiency and receiving sensitivity of the signal.

[0133] By setting the resonant circuit 160 to have capacitive characteristics in the MHB frequency band, at this time the resonant circuit 160 provides low impedance to the signal in the MHB frequency band, allowing the signal in the MHB frequency band to pass. This characteristic can be used to enhance the response of the antenna in the MHB frequency band, and the resonant circuit 160 can help filter out unwanted high-frequency noise or harmonics, and enhance the purity and quality of the signal.

[0134] It should be noted that the working frequency of NFC is relatively low, and a certain length of the frame is required to improve the card swiping induction capability, so the NFC hopes that the length from the feed point to the return point is as long as possible. The low frequency and the medium-high frequency covered by the first antenna 110 have different requirements for the length of the antenna from the feed point to the return point. According to the physical length corresponding to the electrical length of different frequencies, the low frequency requires an antenna length of about 40 mm. The medium-high frequency requires an antenna length of about 21 mm. Therefore, in order to meet the different requirements of the low frequency and the medium-high frequency for the length of the antenna, the resonant circuit 160 is loaded at the first return point 112 of the first antenna 110. The resonant circuit 160 can be equivalent to being disconnected at the NFC frequency, equivalent to inductance at the LB frequency band (low frequency band), and equivalent to capacitance at the MHB frequency band (medium-high frequency band). The frequency response characteristics of the resonant circuit 160 at different frequencies make the length from the first feed point 111 to the first return point 112 of the first antenna 110 different, so as to improve the performance of the NFC, the LB frequency band and the MHB frequency band.

[0135] In a possible implementation manner, as shown in Figure 8 The resonant circuit 160 can include a first circuit 163 and a second circuit 164 connected in parallel. The first circuit 163 includes a first capacitor 1631. The second circuit 164 includes a second capacitor 1641 and an inductor 1642 connected in series, and the capacitance value of the second capacitor 1641 is greater than the capacitance value of the second capacitor 1641. In this way, the resonant circuit 160 can be disconnected in the covered frequency band of the third antenna 130, have inductive characteristics in the first frequency band, and have capacitive characteristics in the second frequency band.

[0136] For example, the capacitance value of the first capacitor 1631 can be 3p (pico farad), the capacitance value of the second capacitor 1641 can be 33p (pico farad), and the inductance value of the inductor 1642 can be 4.3n (nano henry).

[0137] Of course, in other embodiments, the capacitance values of the first capacitor 1631 and the second capacitor 1641 can also be set to other values, and the inductance value of the inductor 1642 can also be set to other values. In the embodiments of the present application, the capacitance values of the first capacitor 1631 and the second capacitor 1641 and the inductance value of the inductor 1642 are not further limited, and can be set according to specific circumstances, as long as the corresponding circuit characteristics can be achieved.

[0138] In the detailed description above, reference is made to the accompanying drawings, which form a part of the disclosure. The drawings show, by way of illustration, specific aspects in which the disclosure can be placed. In this regard, directional terminology, such as "length," "width," "thickness," "upper," "lower," "front," "back," "left," "right," "top," "bottom," "inner," "outer," and the like, can be used with reference to the orientation of the illustrated aspects described. Because components of the described devices can be positioned in a number of orientations, the directional terminology can be used for purposes of explanation without limiting the scope of the disclosure. It is to be understood that other aspects can be utilized and structural or logical changes can be made without departing from the concept of the present disclosure. The above detailed description is, therefore, not to be taken in a limiting sense. All such modifications and variations are intended to be included herein within the scope of the disclosure.

[0139] It should be understood that the features of the various aspects of the disclosure described herein can be combined with each other, unless specifically noted otherwise. As used herein, the term "and / or" includes any one of the associated listed items, as well as any combination of any two or more of the associated listed items; similarly, "at least one of" includes any one of the associated listed items, as well as any combination of any two or more of the associated listed items.

[0140] It should be understood that, unless specifically stated and limited otherwise, the terms "joined," "attached," "mounted," "connected," "linked," "fixed," and the like, as used in the embodiments of the disclosure, should be construed broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection or communication with each other; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise specifically limited. The specific meaning of the above terms in this article can be understood according to the specific circumstances by those skilled in the art.

[0141] Further, the word "over" used in the context of a component, an element, or a layer "over" or positioned "over" a surface is used herein to mean that the component, element, or layer is positioned "indirectly" on the surface such that one or more additional components, elements, or layers are arranged between the surface and the component, element, or layer. However, the word "over" used in the context of a component, an element, or a layer "over" or positioned "over" a surface can also optionally have the specific meaning that the component, element, or layer is positioned "directly" on the surface, e.g., in direct contact with the surface.

[0142] Although terms such as "first," "second," and "third" can be used herein to describe various elements, components, regions, layers or sections, these elements, components, regions, layers or sections should not be limited to the terms. Instead, these terms are used only to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, the first element, component, region, layer or section mentioned in the examples described herein can also be called the second element, component, region, layer or section without departing from the teachings of the examples. In addition, the terms "first," "second" are used for descriptive purposes only and cannot be understood to indicate or imply relative importance or to implicitly specify the number of technical features indicated. Thus, the features defined with "first," "second" can explicitly or implicitly include at least one of the features. In the description herein, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0143] Further, the word "exemplary" is used herein to mean serving as an example, instance, or illustration. Any aspect or design described herein as "exemplary" is not necessarily to be construed as advantageous over other aspects or designs. Rather, the word "exemplary" is used herein to present concepts in one form for illustrative purposes. As used herein, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or." That is, unless specified otherwise, or clear from context, "X employs A or B" is intended to mean any of the natural inclusive permutations. That is, if X employs A; X employs B; or X employs both A and B, then "X employs A or B" is satisfied under any of the foregoing instances. In addition, the articles "a" and "an" as used in this application and the appended claims should generally be construed to mean "one or more" unless specified otherwise or clear from context to be directed to a singular form. Thus, use of the articles in this application and the appended claims is not limiting.

[0144] Likewise, although the present disclosure has been described and illustrated with respect to one or more implementations, equivalent alterations and modifications will become apparent to those skilled in the art that do not depart from the true spirit and scope of the disclosure. The present disclosure includes all such modifications and alterations and is limited only by the scope of the following claims. In particular regard to the various functions performed by the above described components (e.g., elements, resources, etc.), the terms (including a reference to a "means") used to describe such components are intended to correspond, unless otherwise indicated, to any component which performs the described function (e.g., a functional equivalent), even though not structurally equivalent to the disclosed structure. In addition, although a particular feature of the disclosure can have been disclosed with respect to only one of several implementations, other implementations can include the particular feature. For example, the disclosure can be implemented with respect to other implementations that incorporate the particular feature, and that implement other features as disclosed herein, and each of the various implementations have a reasonable expectation of support. Furthermore, to the extent that the terms "includes", "including", "has", "have", "having", or variants thereof are used in either the detailed description or the claims, such terms are intended to be inclusive in a manner similar to the term "comprising".

[0145] Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the features disclosed herein. The specification and examples given are intended as illustrative only and not limiting of the true scope and spirit of the disclosure. The true scope and spirit of the disclosure are indicated by the following claims.

[0146] It is to be understood that the present disclosure is not limited to the precise construction described and as shown in the drawings, and that various modifications and changes can be effected therein by those skilled in the art without departing from the scope of the disclosure. The scope of the disclosure is limited only by the claims appended hereto.

Claims

1. An antenna system, characterized by The antenna system comprises: a first antenna comprising a first feeding point and a first return point arranged at intervals along the extension direction of the first antenna; a second antenna comprising a second feeding point and a second return point arranged at intervals, the first feeding point being arranged adjacent to the second feeding point, and a coupling gap being arranged between the first feeding point and the second feeding point; a third antenna comprising a third feeding point, the third feeding point being electrically connected to the first feeding point, and the third antenna having a lower coverage frequency band than the first antenna.

2. The antenna system of claim 1, wherein, The third antenna is an NFC antenna.

3. The antenna system of claim 2, wherein, The antenna system is applied to an electronic device, and the electronic device at least comprises a metal frame and a metal middle plate, the metal frame being arranged outside the metal middle plate; wherein the first antenna and the second antenna are both arranged on the metal frame, and the third antenna is arranged on the metal middle plate.

4. The antenna system of claim 3, wherein, The coverage frequency band of the first antenna comprises a first frequency band and a second frequency band, and the second frequency band is higher than the first frequency band.

5. The antenna system of claim 4, wherein, The first frequency band is an LB frequency band, and the second frequency band is an MHB frequency band.

6. The antenna system of claim 5, wherein, The first antenna is a cellular antenna.

7. The antenna system of claim 5 or 6, characterized in that, The antenna system further comprises a resonance circuit, the resonance circuit comprising a first end and a second end, the first end of the resonance circuit being connected to the first return point, and the second end of the resonance circuit being grounded; the resonance circuit is used to exhibit a break characteristic in the coverage frequency band of the third antenna, an inductive characteristic in the first frequency band, and a capacitive characteristic in the second frequency band.

8. The antenna system of claim 7, wherein, The resonance circuit comprises a first circuit and a second circuit connected in parallel; wherein the first circuit comprises a first capacitor; the second circuit comprises a second capacitor and an inductor connected in series, and the capacitance value of the second capacitor is greater than the capacitance value of the second capacitor.

9. The antenna system of any of claims 1-6, wherein, The second antenna is a GPS navigation antenna.

10. The antenna system of claim 9, wherein, The coverage frequency band of the second antenna is an L5 frequency band.

11. The antenna system of any of claims 3-6, wherein, The metal frame comprises a top frame and a side frame, and the side frame is arranged at one end of the extension direction of the top frame; a top corner portion is formed between the top frame and the side frame; wherein the first antenna is arranged on the top frame, the second antenna is arranged on the top corner portion, and the coupling gap is formed between the top frame and the top corner portion.

12. The antenna system of any of claims 1-6, wherein, The distance between the first feeding point and the first return point is between 10 mm and 16 mm.

13. The antenna system of any of claims 1-6, wherein, The distance between the first feeding point and one end of the first antenna close to the coupling gap is between 12 mm and 17 mm.

14. The antenna system of any of claims 1-6, wherein, The distance of the coupling gap is less than or equal to 1 mm.

15. The antenna system of any of claims 1-6, wherein, The distance between the second feeding point and one end of the second antenna close to the coupling gap is between 2.5 mm and 3.5 mm.

16. An electronic device, comprising: The antenna system at least comprises a metal middle plate, a metal frame, and the antenna system of any one of claims 1-15; the first antenna and the second antenna of the antenna system are arranged on the metal frame; the third antenna of the antenna system is arranged on the metal middle plate.

17. The electronic device of claim 16, wherein, The metal frame comprises a top frame and a side frame, and the side frame is arranged at one end of the extension direction of the top frame; a top corner portion is formed between the top frame and the side frame; The first antenna is located at the top bezel, the second antenna is located at the top corner portion, and a coupling gap is formed between the top bezel and the top corner portion.

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