Antenna device and electronic device

Abstract

The application discloses an antenna device and an electronic device. The antenna device comprises: a ring-shaped radiation frame body, a first feeding point and a second feeding point are arranged at intervals, and the first feeding point and the second feeding point cooperate with the ring-shaped radiation frame body to form a first antenna and a second antenna respectively; a carrier capable of carrying and conducting electronic elements, the carrier is shared with the ring-shaped radiation frame body, and the carrier is arranged in parallel in a cross-sectional area formed by the ring-shaped radiation frame body, the cross-sectional area is perpendicular to an opening direction of the ring-shaped radiation frame body, and a gap is formed between the carrier and the ring-shaped radiation frame body to form a clearance of the first antenna and the second antenna; a capacitive element arranged between the first antenna and the carrier and an inductive element arranged between the second antenna and the carrier are used for controlling the isolation between the first antenna and the second antenna.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to an antenna device and electronic device. Background Technology

[0002] In communication terminals with dual antennas, the dual antennas need to be integrated into a limited space.

[0003] However, due to the limited control of communication terminals, there is a problem of signal interference caused by the inability to achieve complete signal isolation between the two antennas. Summary of the Invention

[0004] In view of the above, this application provides an antenna device and an electronic device, as follows:

[0005] An antenna device, comprising:

[0006] A ring-shaped radiating frame is provided with a first feed point and a second feed point at intervals. The first feed point and the second feed point cooperate with the ring-shaped radiating frame to form a first antenna and a second antenna, respectively.

[0007] A carrier capable of carrying and conducting electronic components shares a ground with the annular radiating frame. The carrier is arranged parallel to the cross-sectional area formed by the annular radiating frame. The cross-sectional area is perpendicular to the opening direction of the annular radiating frame. There is a gap between the carrier and the annular radiating frame to form a clearance area for the first antenna and the second antenna.

[0008] A capacitor element disposed between the first antenna and the carrier, and an inductor element disposed between the second antenna and the carrier, are used to control the isolation between the first antenna and the second antenna.

[0009] Preferably, in the above-described antenna device, the first feed point is located at a first position on the annular radiating frame, and the second feed point is located at a second position on the annular radiating frame, wherein the first position and the second position are the two positions furthest apart on the annular radiating frame.

[0010] Preferably, in the above-mentioned antenna device, the annular radiating frame includes a first radiating segment and a second radiating segment divided by the first feed point and the second feed point, one end of the capacitor element is connected to the first radiating segment and the other end is connected to the grounded carrier, and one end of the inductor element is connected to the second radiating segment and the other end is connected to the grounded carrier.

[0011] Wherein, the first radiating segment and the second radiating segment may have the same or different dimensions; and / or,

[0012] The connection position of the capacitor element on the first radiating segment and the connection position of the inductor element on the second radiating segment satisfy a first positional relationship.

[0013] Preferably, in the above-described antenna device, the first radiating segment and the second radiating segment have the same size, the capacitor element is connected at a third position in the first radiating segment, and the inductor element is connected at a fourth position in the second radiating segment, wherein the third position and the fourth position satisfy a second positional relationship.

[0014] Preferably, the antenna device further includes a control circuit for controlling the capacitance value of the capacitor element and the inductance of the inductor element according to the received adjustment command, so as to control the isolation between the first antenna and the second antenna.

[0015] The inductor and capacitor can be used to counteract the inherent reactance of the annular radiating frame.

[0016] In the aforementioned antenna device, preferably, the values ​​of the capacitor and the inductor have a first correlation with the frequency of the antenna.

[0017] Preferably, in the above-described antenna device, the connection positions of the capacitor element and the inductor element, the first feed point and the second feed point constitute the current zero points of the first antenna and the second antenna, so that the excitation current flowing through the first antenna and the second antenna is orthogonally distributed.

[0018] In the aforementioned antenna device, preferably, the excitation currents flowing through the first antenna and the second antenna form mutually orthogonal differential-mode currents and common-mode currents.

[0019] Preferably, in the above-mentioned antenna device, the first feed point and the second feed point are fed with odd-mode signals of equal amplitude and opposite phase, so that the first antenna and the second antenna generate excitation radiation, wherein the first antenna is responsible for transmitting and receiving the radiated signal, and the second antenna is responsible for receiving the radiated signal.

[0020] An electronic device, comprising at least:

[0021] Electronic components;

[0022] Antenna device, wherein the antenna device includes:

[0023] A ring-shaped radiating frame is provided with a first feed point and a second feed point at intervals. The first feed point and the second feed point cooperate with the ring-shaped radiating frame to form a first antenna and a second antenna, respectively.

[0024] A carrier capable of carrying and conducting the electronic components shares a ground with the annular radiating frame. The carrier is arranged parallel to the cross-sectional area formed by the annular radiating frame. The cross-sectional area is perpendicular to the opening direction of the annular radiating frame. There is a gap between the carrier and the annular radiating frame to form a clearance area for the first antenna and the second antenna.

[0025] A capacitor element disposed between the first antenna and the carrier, and an inductor element disposed between the second antenna and the carrier, are used to control the isolation between the first antenna and the second antenna. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of an antenna device provided in Embodiment 1 of this application;

[0028] Figure 2 This is another structural schematic diagram of an antenna device provided in Embodiment 1 of this application;

[0029] Figure 3 as well as Figure 4 These are further structural schematic diagrams of an antenna device provided in Embodiment 1 of this application;

[0030] Figure 5 This is a schematic diagram of the structure of an electronic device provided in Embodiment 2 of this application;

[0031] Figure 6 This is a schematic diagram of the structure of the metal frame antenna implemented in mobile phones according to this application;

[0032] Figure 7 This is a graph showing the isolation achieved by the metal frame antenna implemented in mobile phones according to this application.

[0033] Figure 8 This is a schematic diagram of the matching circuit for the metal frame antenna implemented in a mobile phone according to this application;

[0034] Figure 9 This is a graph showing the overall system efficiency of the metal frame antenna implemented in mobile phones according to this application.

[0035] Figure 10 This is a schematic diagram of the current distribution in Port1 of the metal frame antenna implemented in mobile phones according to this application;

[0036] Figure 11 This is a schematic diagram of the current distribution in Port2 of the metal frame antenna implemented in mobile phones according to this application;

[0037] Figure 12 This is the 2.4GHz xoy plane radiation pattern on Port1 of the metal frame antenna implemented in the mobile phone according to this application;

[0038] Figure 13 This is the 2.4GHz xoy plane radiation pattern on Port2 of the metal frame antenna implemented in the mobile phone according to this application. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] refer to Figure 1 The diagram shown is a structural schematic of an antenna device according to Embodiment 1 of this application. This antenna device can be configured on an electronic device, such as a mobile phone or tablet. The technical solution in this embodiment is mainly used to improve signal interference in the antenna device.

[0041] Specifically, the antenna device in this embodiment may include the following structure:

[0042] The annular radiating frame 1 is provided with a first feed point 2 and a second feed point 3 at intervals. The first feed point 2 and the second feed point 3 cooperate with the annular radiating frame 1 to form a first antenna A and a second antenna B, respectively.

[0043] The carrier 5, capable of carrying and conducting electronic components 4, shares ground with the annular radiating frame 1. The carrier 5 is arranged parallel to the cross-sectional area 6 formed by the annular radiating frame 1. The cross-sectional area 6 is perpendicular to the opening direction of the annular radiating frame 1 to form a plate-like structure, saving space. There is a gap between the carrier 5 and the annular radiating frame 1 to form the clearance area C of the first antenna A and the second antenna B.

[0044] The capacitor element 7, disposed between the first antenna A and the carrier 5, and the inductor element 8, disposed between the second antenna B and the carrier 5, are used to control the isolation between the first antenna A and the second antenna B. Therefore, in this embodiment, the isolation between the first antenna A and the second antenna B is controlled by changing the values ​​of the capacitor element 7 and the inductor element 8.

[0045] The annular radiating frame 1 can be a square structure, such as... Figure 1 As shown, it can also be other shapes, such as a perfect circle or an ellipse, as shown. Figure 2 As shown in the diagram, a first feed point 2 and a second feed point 3 are positioned at a first distance on the annular radiating frame 1, such that the first feed point 2 and the annular radiating frame 1 form a first antenna A, and the second feed point 3 and the annular radiating frame 1 form a second antenna B. Based on this, the first antenna A and the second antenna B form a differential antenna. Specifically, the first feed point 2 and the second feed point 3 are fed with odd-mode signals of equal amplitude and opposite phase, thereby causing the first antenna A and the second antenna B to generate excitation radiation. Thus, the first antenna A acts as the main antenna, responsible for transmitting and receiving the radiated signal, and the second antenna B acts as the diversity antenna, responsible for receiving the radiated signal.

[0046] In addition, electronic component 4 can be a chip such as a CPU that can be carried on carrier 5, and carrier 5 can be a printed circuit board (PCB) that can carry various electronic components and conduct electrical and data connections to the electronic components. Carrier 5 is connected to the annular radiating frame 1 and the connection point is grounded, so carrier 5 and annular radiating frame 1 share the ground.

[0047] As can be seen from the above scheme, in the antenna device provided in Embodiment 1 of this application, a carrier capable of carrying and conducting electronic components is arranged in parallel within the cross-sectional area formed by the annular radiating frame. The first feed point and the second feed point, which are spaced apart on the annular radiating frame, cooperate with the annular radiating frame to form the first antenna and the second antenna, respectively. Based on this, a capacitor element is arranged between the first antenna and the carrier, and an inductor element is arranged between the second antenna and the carrier, thereby controlling the isolation between the first antenna and the second antenna, and thus solving the problem of signal interference between the first antenna and the second antenna.

[0048] In one implementation, the first feed point 2 can be set at the first position X of the annular radiating frame 1, and the second feed point 3 can be set at the second position Y of the annular radiating frame 1. The first position X and the second position Y are the two positions that are farthest apart on the annular radiating frame 1.

[0049] by Figure 1 Taking a square annular radiating frame 1 as an example, the first feed point 2 and the second feed point 3 are respectively set at the diagonal vertices of the annular radiating frame 1. The first feed point 2 is set at the upper right vertex of the annular radiating frame 1, and the second feed point 3 is set at the lower left vertex of the annular radiating frame 1. The interval between the first feed point 2 and the second feed point 3 is the length of the diagonal of the annular radiating frame 1.

[0050] Taking the annular radial frame 1 as a perfect circle as an example, such as Figure 2As shown, the first feed point 2 and the second feed point 3 are set on a straight line passing through the center of the annular radiating frame 1, and the interval between the first feed point 2 and the second feed point 3 is the diameter of the annular radiating frame 1.

[0051] In one implementation, the annular radiating frame 1 may include a first radiating segment 9 and a second radiating segment 10, divided by a first feed point 2 and a second feed point 3. That is, the radiating segment between the first feed point 2 and the second feed point 3 is designated as the first radiating segment 9, and the radiating segment between the other side of the same location is designated as the second radiating segment 10. Based on this, one end of the capacitor element 7 is connected to the first radiating segment 9, and the other end is connected to a grounded carrier 5. For example, the positive terminal of the capacitor element 7 is connected to the first radiating segment 9, and the negative terminal is connected to the carrier 5, i.e., grounded. Similarly, one end of the inductor element 8 is connected to the second radiating segment 10, and the other end is connected to the grounded carrier 5. For example, the positive terminal of the inductor element 8 is connected to the second radiating segment 10, and the negative terminal is connected to the carrier 5, i.e., grounded.

[0052] Wherein, the first radiating segment 9 and the second radiating segment 10 have the same or different dimensions; and / or, the connection position of the capacitor element 7 on the first radiating segment 9 and the connection position of the inductor element 8 on the second radiating segment 10 satisfy a first positional relationship.

[0053] The first positional relationship is as follows: the capacitor element 7 is positioned close to the first feed point 2, and the inductor element 8 is positioned close to the second feed point 3. For example, the connection end between the capacitor element 7 and the annular radiating frame 1 is positioned close to the first feed point 2, and the connection end between the inductor element 8 and the annular radiating frame 1 is positioned close to the second feed point 3.

[0054] In a specific implementation, the first radiating segment 9 and the second radiating segment 10 have the same size, while the capacitor element 7 is connected to the third position of the first radiating segment 9 and the inductor element 8 is connected to the fourth position of the second radiating segment 10. Here, the third position and the fourth position satisfy a second positional relationship.

[0055] The second positional relationship is a symmetrical positional relationship about the center point of the annular radial frame 1. For example, taking the annular radial frame 1 as a square as an example, such as... Figure 3 As shown, capacitor element 7 is connected to the center of the first frame a in the first radiating segment 9, where the first frame a is the frame in the first radiating segment 9 with the first feed point 2. Inductor element 8 is connected to the center of the second frame b in the second radiating segment 10, where the second frame b is the opposite frame to the first frame a, and the second frame b is the frame in the second radiating segment 10 with the second feed point 3.

[0056] For example, taking the annular radial frame 1 as a square example, such as... Figure 1 As shown, capacitor 7 is connected to the vertex of the first frame a in the first radiating segment 9. The first frame a is the frame in the first radiating segment 9 where the first feed point 2 is provided. Capacitor 7 and the first feed point 2 are respectively located at the vertex of the two sides of the first frame a. Inductor 8 is connected to the vertex of the second frame b in the second radiating segment 10. The second frame b is the frame in the second radiating segment 10 where the second feed point 3 is provided. Inductor 8 and the second feed point 3 are respectively located at the vertex of the two sides of the second frame b.

[0057] Therefore, since the first radiating segment 9 and the second radiating segment 10 are the same size and the farthest apart, the currents formed by the first antenna A and the second antenna B at the diagonal position of the annular radiating frame 1 are orthogonally distributed, thus achieving higher anti-interference performance and higher signal isolation between the first antenna A and the second antenna B.

[0058] In one implementation, the antenna device in this embodiment may further include the following structure, such as... Figure 4 As shown:

[0059] The control circuit 11 is used to control the capacitance value of the capacitor element 7 and the inductance of the inductor element 8 according to the received adjustment command, so as to control the isolation between the first antenna A and the second antenna B.

[0060] Among them, the inductor 8 and the capacitor 7 can be used to counteract the inherent reactance of the annular radiating frame 1.

[0061] Specifically, the values ​​of capacitor 7 and inductor 8 have a primary correlation with the antenna frequency. Based on this, in this embodiment, the capacitance value of capacitor 7 and the inductance value of inductor 8 can be controlled by the control circuit 11. That is, by changing the capacitance value of capacitor 7 and the inductance value of inductor 8, the communication frequency of the first antenna A and the communication frequency of the second antenna B can be changed. For example, increasing either the capacitance value of capacitor 7 or the inductance value of inductor 8 can decrease the antenna frequency of the first antenna A and the second antenna B, while simultaneously increasing both the capacitance value of capacitor 7 and the inductance value of inductor 8 can increase the antenna frequency of the first antenna A and the second antenna B.

[0062] In one implementation, the connection points of capacitor element 7 and inductor element 8, the first feed point 2, and the second feed point 3 constitute the current zero points of the first antenna A and the second antenna B, so that the excitation currents flowing through the first antenna A and the second antenna B are orthogonally distributed. This minimizes signal interference between the first antenna A and the second antenna B. Furthermore, the excitation currents flowing through the first antenna A and the second antenna B form mutually orthogonal differential-mode currents and common-mode currents. This achieves high isolation between the first antenna A and the second antenna B.

[0063] refer to Figure 5 This is a schematic diagram of the structure of an electronic device provided in Embodiment 2 of this application. The electronic device can be a communication terminal such as a mobile phone or tablet. The electronic device in this embodiment includes at least the following structures:

[0064] Electronic component 4;

[0065] Antenna device 12, wherein the antenna device 12 includes:

[0066] The annular radiating frame 1 is provided with a first feed point 2 and a second feed point 3 at intervals. The first feed point 2 and the second feed point 3 cooperate with the annular radiating frame 1 to form a first antenna A and a second antenna B, respectively.

[0067] The carrier 5, capable of carrying and conducting electronic components 4, shares ground with the annular radiating frame 1. The carrier 5 is arranged parallel to the cross-sectional area 6 formed by the annular radiating frame 1. The cross-sectional area 6 is perpendicular to the opening direction of the annular radiating frame 1 to form a plate-like structure, saving space. There is a gap between the carrier 5 and the annular radiating frame 1 to form the clearance area C of the first antenna A and the second antenna B.

[0068] The capacitor element 7, disposed between the first antenna A and the carrier 5, and the inductor element 8, disposed between the second antenna B and the carrier 5, are used to control the isolation between the first antenna A and the second antenna B. Therefore, in this embodiment, the isolation between the first antenna A and the second antenna B can be controlled by changing the values ​​of the capacitor element 7 and the inductor element 8.

[0069] As can be seen from the above scheme, in the electronic device provided in Embodiment 2 of this application, a carrier capable of carrying and conducting electronic components is arranged in parallel within the cross-sectional area formed by the annular radiating frame. The first feed point and the second feed point, which are spaced apart on the annular radiating frame, cooperate with the annular radiating frame to form the first antenna and the second antenna, respectively. Based on this, a capacitor element is arranged between the first antenna and the carrier, and an inductor element is arranged between the second antenna and the carrier, thereby controlling the isolation between the first antenna and the second antenna, and thus solving the problem of signal interference between the first antenna and the second antenna.

[0070] Taking a mobile phone's WiFi antenna as an example, in a terminal antenna with a limited volume, due to the requirement for a thinner and lighter mobile phone structure, dual antennas need to be integrated into a limited space. This results in low isolation between antennas, affecting mobile phone performance. To reduce interference between antennas, a large distance needs to be maintained between each antenna. This results in a larger overall size of the antenna system. However, when the antennas are close together, mutual interference occurs between antenna elements. For example, there is the issue of isolation between the Global Positioning System (GPS), mobile hotspot WiFi, Bluetooth (BT) antennas and WiFi MIMO (multiple-in multiple-out) antennas. The isolation between each antenna element needs to be optimized.

[0071] To address the aforementioned problems and the shortcomings of existing solutions, this application proposes the following technical solution:

[0072] like Figure 6 The metal frame antenna shown has ports Port1 & Port2 operating in the WLAN 2.4GHz band. This application proposes a symmetrical slotted differential antenna, where Port1 (position 01) is the feed position of the WIFI main antenna (first feed point 2), and Port2 (position 02) is the feed position of the WIFI diversity antenna (second feed point 3), forming a differential structure. The antenna structure includes: a seamless metal frame, a PCB ground plane (position 05), a clearance area between the frame and ground (position 06), a decoupling capacitor Cp (position 04), a decoupling inductor Lp (position 03), and dual feed ports (positions 01 & 02) located diagonally. The metal frame can be 42mm*38mm in size, and the gap (06) between it and the PCB is 1mm, representing the clearance area for non-metallic regions.

[0073] Specifically as follows:

[0074] 1) The feed ports 1 and 2 are located diagonally. On the one hand, this serves to excite more modes, and on the other hand, due to symmetry, it increases the effective radiated size of the antenna, thereby improving radiation efficiency and bandwidth.

[0075] 2) Working principle: The decoupling capacitor Cp (capacitor element 7) and the decoupling inductor Lp (inductor element 8) play a tuning role in the isolation of WIFI 2.4G. The working principle is to apply Lp or Cp to cancel the inherent reactance of the middle frame, which becomes an ideal grounding point for high frequencies. When the current flows out of one port and encounters the current zero point, it will be interrupted and flow to another port, thus improving the isolation.

[0076] 3) Characteristics of the position of Lp or Cp: The position range of Cp is from (04) to the midpoint of the horizontal short side, and the position range of Lp is from (03) to the midpoint of the horizontal short side. The optimal position is the midpoint.

[0077] 4) Characteristics of Lp or Cp values: When either value increases, the S21 trough resonant point shifts to lower frequencies. For example... Figure 7 As shown by the lowest point of the curve, when an appropriate value is selected, the isolation S between the main and diversity antennas can reach 45 dB. The matching circuit is as follows: Figure 8 After optimization, Lp = 1.6nH and Cp = 0.7pF. The two antennas exhibit high overall system efficiency, such as... Figure 9 As shown in the image.

[0078] 5) From the current distribution perspective, the current in Port1 exhibits even symmetry along the dashed X-axis, indicating a common-mode state, as shown below. Figure 10 The current distribution at Port1 is shown in the figure, with the black dots representing zero current points; however, the current distribution along the X-axis exhibits odd symmetry, indicating a differential mode state, as shown below. Figure 11 The current distribution at Port2 is shown in the figure, with the black dot representing the zero current point. The two exhibit orthogonal characteristics.

[0079] Based on this, this application can achieve a high isolation of 45dB for WiFi 2.4GHz, such as... Figure 12 As shown in the 2.4GHz xoy plane direction on Port1, as... Figure 13 The 2.4GHz xoy plane radiation pattern on Port2 shows that the radiation pattern exhibits orthogonality in the xoy plane, achieving radiation pattern diversity.

[0080] As can be seen, this application achieves orthogonality in the antenna structure and radiation pattern after decoupling by setting the positions and values ​​of the decoupling capacitor Cp and the decoupling inductor Lp. Therefore, this application achieves a 45dB isolation effect at the same frequency without additional decoupling stubs. The self-healing decoupling method is easy to adjust and can meet various complex system requirements. Furthermore, this application can excite orthogonal common-mode and differential-mode signals, resulting in good isolation, radiation pattern diversity, signal complementarity, and fewer dead zones.

[0081] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0082] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0083] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0084] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An antenna device, comprising: A ring-shaped radiating frame is provided with a first feed point and a second feed point at intervals. The first feed point and the second feed point cooperate with the ring-shaped radiating frame to form a first antenna and a second antenna, respectively. A carrier capable of carrying and conducting electronic components shares a ground with the annular radiating frame. The carrier is arranged parallel to the cross-sectional area formed by the annular radiating frame. The cross-sectional area is perpendicular to the opening direction of the annular radiating frame. There is a gap between the carrier and the annular radiating frame to form a clearance area for the first antenna and the second antenna. A capacitor element disposed between the first antenna and the carrier, and an inductor element disposed between the second antenna and the carrier, are used to control the isolation between the first antenna and the second antenna. It also includes: a control circuit, used to control the capacitance value of the capacitor element and the inductance of the inductor element according to the received adjustment command, so as to control the isolation between the first antenna and the second antenna; The inductor and capacitor can be used to cancel the inherent reactance of the annular radiating frame. The connection positions of the capacitor and inductor, the first feed point and the second feed point constitute the current zero points of the first antenna and the second antenna, so that the excitation current flowing through the first antenna and the second antenna is orthogonally distributed. The annular radiating frame includes a first radiating segment and a second radiating segment divided by the first feed point and the second feed point. One end of the capacitor element is connected to the first radiating segment and the other end is connected to a grounded carrier. One end of the inductor element is connected to the second radiating segment and the other end is connected to a grounded carrier. The first radiating segment and the second radiating segment have the same size.

2. The antenna device according to claim 1, wherein the first feed point is disposed at a first position of the annular radiating frame, and the second feed point is disposed at a second position of the annular radiating frame, wherein the first position and the second position are the two positions furthest apart on the annular radiating frame.

3. The antenna device according to claim 1 or 2, wherein the access position of the capacitor element on the first radiating segment and the access position of the inductor element on the second radiating segment satisfy a first positional relationship, wherein the first positional relationship is that the capacitor element is set close to the first feed point and the inductor element is set close to the second feed point.

4. The antenna device according to claim 3, wherein the capacitor element is connected to the third position of the first radiating body segment, the inductor element is connected to the fourth position of the second radiating body segment, and the third position and the fourth position satisfy a second positional relationship, wherein the second positional relationship is a symmetrical positional relationship about the center point of the annular radiating frame.

5. The antenna device according to claim 1, wherein, The values ​​of the capacitor and the inductor are related to the frequency of the antenna by a first correlation. The first correlation is that the communication frequency of the first antenna and the communication frequency of the second antenna can be changed by changing the capacitance value of the capacitor and the inductance value of the inductor.

6. The antenna device according to claim 1, wherein, The excitation currents flowing through the first antenna and the second antenna form mutually orthogonal differential-mode currents and common-mode currents.

7. The antenna device according to claim 1, wherein, The first feed point and the second feed point are fed with odd-mode signals of equal amplitude and opposite phase, so that the first antenna and the second antenna generate excitation radiation, wherein the first antenna is responsible for transmitting and receiving the radiated signal, and the second antenna is responsible for receiving the radiated signal.

8. An electronic device comprising at least: Electronic components; Antenna device, wherein the antenna device includes: A ring-shaped radiating frame is provided with a first feed point and a second feed point at intervals. The first feed point and the second feed point cooperate with the ring-shaped radiating frame to form a first antenna and a second antenna, respectively. A carrier capable of carrying and conducting the electronic components shares a ground with the annular radiating frame. The carrier is arranged parallel to the cross-sectional area formed by the annular radiating frame. The cross-sectional area is perpendicular to the opening direction of the annular radiating frame. There is a gap between the carrier and the annular radiating frame to form a clearance area for the first antenna and the second antenna. A capacitor element disposed between the first antenna and the carrier, and an inductor element disposed between the second antenna and the carrier, are used to control the isolation between the first antenna and the second antenna. The antenna device further includes a control circuit, used to control the capacitance value of the capacitor element and the inductance of the inductor element according to the received adjustment command, so as to control the isolation between the first antenna and the second antenna. The inductor and capacitor can be used to cancel the inherent reactance of the annular radiating frame. The connection positions of the capacitor and inductor, the first feed point and the second feed point constitute the current zero points of the first antenna and the second antenna, so that the excitation current flowing through the first antenna and the second antenna is orthogonally distributed. The annular radiating frame includes a first radiating segment and a second radiating segment divided by the first feed point and the second feed point. One end of the capacitor element is connected to the first radiating segment and the other end is connected to a grounded carrier. One end of the inductor element is connected to the second radiating segment and the other end is connected to a grounded carrier. The first radiating segment and the second radiating segment have the same size.

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