Electronic equipment

Abstract

The invention discloses electronic equipment. The electronic equipment comprises a frame body and an antenna radiator, the antenna radiator comprises a first part radiator, a second part radiator, a third part radiator and a fourth part radiator which are sequentially connected end to end; the first part radiator is located on the side face of the frame body, the third part radiator is located on the first surface of the frame body, and the first part of the first part radiator and the first part of the third part radiator are arranged along the first side edge of the frame body. The second part of the first radiating body and the second part of the third radiating body are arranged along the second side edge of the frame body; a feeding point on the antenna radiator is located in the middle area of the first part radiator or the third part radiator, and a grounding point is located in the middle area of the first part radiator or the third part radiator; the antenna radiator works in an intermediate frequency band in a common mode and works in a high frequency band in a differential mode, the side face and the first surface are arranged adjacently, and the first side edge and the second side edge are arranged adjacently.

Description

Technical Field

[0001] This application relates to the field of electronic product technology, and more particularly to an electronic device. Background Technology

[0002] The amount of electromagnetic waves absorbed by the human body is mainly measured by the specific absorption ratio (SAR). The smaller the SAR value, the less impact electromagnetic radiation has on the human body. Because electromagnetic radiation can have adverse effects on the human body, the SAR performance of electronic devices needs to be specially designed; otherwise, antennas will be required to reduce their radio frequency conducted power, resulting in a significant decrease in over-the-air (OTA) download performance. On the other hand, with the increasing maturity of intelligent electronic devices, the pursuit of thinner and lighter devices and extreme screen-to-body ratios has become an inevitable trend. However, this design significantly compresses the space for antenna arrangement, leading to a deterioration of the antenna environment. Therefore, achieving antenna miniaturization, multi-frequency operation, and low SAR peak values ​​within the limited space of electronic devices is an important issue worthy of research.

[0003] Currently, mid-to-high frequency antennas in electronic devices typically employ an inverted F antenna (IFA) structure. For example, the total length of the antenna radiator is set to L (L≈0.25λ). mid , λ mid It is the wavelength corresponding to the resonant frequency in the mid-frequency band, and it operates at the mid-frequency f. mid The resonant mode is a quarter-IFA mode, operating at a high frequency f. High The resonant mode is a quarter-pole mode. This antenna operates in the mid-frequency band where SAR hotspots are relatively concentrated, resulting in poor SAR performance. Summary of the Invention

[0004] This application provides an electronic device to address the problem of poor SAR performance in current mid-to-high frequency antennas.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] This application provides an electronic device, including: a frame and an antenna radiator;

[0007] The antenna radiator includes a first part radiator, a second part radiator, a third part radiator, and a fourth part radiator connected end to end; wherein, the first part radiator is located on the side of the frame, the third part radiator is located on the first surface of the frame, and the first part of the first part radiator and the first part of the third part radiator are arranged along the first side of the frame, and the second part of the first part radiator and the second part of the third part radiator are arranged along the second side of the frame;

[0008] The antenna radiator is provided with a feed point and a ground point. The feed point is located in the middle region of the first part of the radiator or the third part of the radiator, and the ground point is located in the middle region of the first part of the radiator or the third part of the radiator.

[0009] The antenna radiator operates in the intermediate frequency band in common mode and in the high frequency band in differential mode. The side surface and the first surface are arranged adjacent to each other, and the first side edge and the second side edge are arranged adjacent to each other.

[0010] In this embodiment, the antenna radiator is constructed by sequentially connecting a first radiator, a second radiator, a third radiator, and a fourth radiator. The first radiator is located on the side of the frame, the third radiator is located on the first surface of the frame, and the first portions of the first and third radiators are arranged along the first side of the frame, while the second portions of the first and third radiators are arranged along the second side of the frame. This reduces the planar space occupied by the antenna radiator, thus ensuring its miniaturization. Furthermore, by placing the feed point and ground point of the antenna radiator in the middle region of either the first or third radiator, it can operate in the mid-frequency band in common-mode and in the high-frequency band in differential-mode. This achieves coverage of the mid-to-high frequency band, and the antenna radiator exhibits good radiation efficiency and low SAR in the mid-to-high frequency band, thereby solving the problem of poor SAR performance in current mid-to-high frequency antennas. Attached Figure Description

[0011] Figure 1 An exploded view illustrating an embodiment of the electronic device of this application;

[0012] Figure 2 A partial schematic diagram illustrating an electronic device according to an embodiment of this application;

[0013] Figure 3aOne of the schematic diagrams illustrating an antenna radiator according to an embodiment of this application;

[0014] Figure 3b A second schematic diagram illustrating an antenna radiator according to an embodiment of this application;

[0015] Figure 3c Schematic diagram three illustrating the antenna radiator of an embodiment of this application;

[0016] Figure 3d Schematic diagram four illustrating the antenna radiator of an embodiment of this application;

[0017] Figure 3e Fifth schematic diagram illustrating the antenna radiator of an embodiment of this application;

[0018] Figure 3f Sixth schematic diagram illustrating the antenna radiator of an embodiment of this application;

[0019] Figure 4 One of the schematic diagrams showing the current distribution of the antenna radiator in an embodiment of this application;

[0020] Figure 5 A second schematic diagram illustrating the current distribution of the antenna radiator in an embodiment of this application;

[0021] Figure 6a Schematic diagram seven illustrating the antenna radiator of an embodiment of this application;

[0022] Figure 6b Schematic diagram eight illustrating the antenna radiator of an embodiment of this application;

[0023] Figure 6c Schematic diagram nine illustrating the antenna radiator of an embodiment of this application;

[0024] Figure 6d Schematic diagram ten illustrating the antenna radiator of an embodiment of this application;

[0025] Figure 6e Schematic diagram eleven illustrating an antenna radiator according to an embodiment of this application;

[0026] Figure 6f Schematic diagram XII illustrating an antenna radiator according to an embodiment of this application;

[0027] Figure 7a The third schematic diagram illustrating the current distribution of the antenna radiator in an embodiment of this application;

[0028] Figure 7b Fourth schematic diagram illustrating the current distribution of the antenna radiator in an embodiment of this application;

[0029] Figure 8One of the schematic diagrams illustrating the radiation efficiency of the antenna radiator in an embodiment of this application;

[0030] Figure 9a Schematic diagram thirteen illustrating an embodiment of the antenna radiator of this application;

[0031] Figure 9b Fourteenth schematic diagram illustrating an antenna radiator according to an embodiment of this application;

[0032] Figure 9c Schematic diagram of an antenna radiator according to an embodiment of this application, number fifteen;

[0033] Figure 9d Schematic diagram sixteen illustrating the antenna radiator of an embodiment of this application;

[0034] Figure 9e Schematic diagram seventeen illustrating an antenna radiator according to an embodiment of this application;

[0035] Figure 9f Schematic diagram eighteen illustrating an antenna radiator according to an embodiment of this application;

[0036] Figure 9g Schematic diagram 19 illustrating an antenna radiator according to an embodiment of this application;

[0037] Figure 9h Schematic diagram 20 illustrating an antenna radiator according to an embodiment of this application;

[0038] Figure 10a One of the schematic diagrams illustrating the filtering circuit of an embodiment of this application;

[0039] Figure 10b A second schematic diagram illustrating the filtering circuit of an embodiment of this application;

[0040] Figure 10c The third schematic diagram illustrates the filtering circuit of an embodiment of this application;

[0041] Figure 11a express Figure 10a A schematic diagram of the transmission coefficient of the filter circuit;

[0042] Figure 11b express Figure 10b A schematic diagram of the transmission coefficient of the filter circuit;

[0043] Figure 11c express Figure 10c A schematic diagram of the transmission coefficient of the filter circuit;

[0044] Figure 12 A schematic diagram illustrating the radiation efficiency of the antenna radiator and the overall system efficiency in low-frequency and high-frequency states according to an embodiment of this application;

[0045] Figure 13a Fifth schematic diagram illustrating the current distribution of the antenna radiator in an embodiment of this application;

[0046] Figure 13b Sixth schematic diagram illustrating the current distribution of the antenna radiator in an embodiment of this application;

[0047] Figure 13c Seventh schematic diagram illustrating the current distribution of the antenna radiator in an embodiment of this application;

[0048] Figure 14a Schematic diagram of an antenna radiator according to an embodiment of this application, number twenty-one;

[0049] Figure 14b Schematic diagram twenty-two illustrating an antenna radiator according to an embodiment of this application;

[0050] Figure 14c Schematic diagram of an antenna radiator according to an embodiment of this application (model number 23);

[0051] Figure 14d Schematic diagram of an antenna radiator according to an embodiment of this application (model number 24);

[0052] Figure 14e Schematic diagram of an antenna radiator according to an embodiment of this application (model number 25);

[0053] Figure 14f Schematic diagram of an antenna radiator according to an embodiment of this application, number twenty-six;

[0054] Figure 15 Eighth schematic diagram illustrating the current distribution of the antenna radiator in an embodiment of this application;

[0055] Figure 16a Schematic diagram twenty-seven illustrating an antenna radiator according to an embodiment of this application;

[0056] Figure 16b Schematic diagram twenty-eight of an embodiment of the antenna radiator of this application;

[0057] Figure 16c Schematic diagram number twenty-nine illustrating an antenna radiator according to an embodiment of this application;

[0058] Figure 16d Schematic diagram of an antenna radiator according to an embodiment of this application (number 30);

[0059] Figure 17 This is a second schematic diagram illustrating the radiation efficiency of the antenna radiator in an embodiment of this application. Detailed Implementation

[0060] Exemplary embodiments of the present application will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art.

[0061] The following describes the relevant technologies of this application:

[0062] I. Overview of Electronic Equipment Environment

[0063] Figure 1 This is an exploded view of an electronic device, whose structure includes a back cover 101, a motherboard 102, a motherboard bracket 103, a housing 104, and a display screen 105. Optionally, a metal decorative ring 106 may be provided on the back cover 101, corresponding to the camera module of the electronic device, which can also be designed as an antenna. Optionally, the housing 104 may include a mid-frame 1041 and a bottom plate 1042, such as... Figure 2 As shown. The base plate 1042 is a metal structure, while the middle frame 1041 can be either a metal or plastic structure. For example, when the middle frame 1041 is a metal structure, it can also serve as an antenna radiator. As another example, when the middle frame 1041 is a plastic structure, the antenna radiator can be a flexible printed circuit board 107 (FPC) tightly attached to the inner wall of the middle frame 1041.

[0064] II. Normalized SAR

[0065] The magnitude of the SAR peak value is related to the conducted power of the RF front-end and the antenna's own radiation efficiency (i.e., the actual radiated electromagnetic energy). To effectively compare SAR performance, the conducted power of the RF front-end and the antenna's own radiation efficiency need to be normalized to the same level, and the SAR peak value should be compared based on this normalization. Therefore, the concept of normalized SAR is introduced. This application uses a normalized SAR definition of 24 dBm RF conducted power and -5 dB antenna efficiency as an example to illustrate the antenna performance effect.

[0066] like Figure 3a As shown in ~d, an embodiment of this application provides an electronic device, including: a frame 1 and an antenna radiator 2;

[0067] The antenna radiator 2 includes a first radiator 21, a second radiator 22, a third radiator 23, and a fourth radiator 24 connected end to end; wherein, the first radiator 21 is located on the side of the frame 1, the third radiator 23 is located on the first surface of the frame 1, and the first part 211 of the first radiator and the first part 231 of the third radiator are arranged along the first side of the frame 1, and the second part 212 of the first radiator and the second part 232 of the third radiator are arranged along the second side of the frame 1;

[0068] The antenna radiator 2 is provided with a feed point 25 and a ground point 26. The feed point 25 is located in the middle region of the first part of the radiator 21 or the third part of the radiator 23, and the ground point 26 is located in the middle region of the first part of the radiator 21 or the third part of the radiator 23.

[0069] The antenna radiator 2 operates in the intermediate frequency band in common mode and in the high frequency band in differential mode. The side surface and the first surface are arranged adjacent to each other, and the first side edge and the second side edge are arranged adjacent to each other.

[0070] Optionally, the frame 1 can be a shell, such as a shell that may include a middle frame and a bottom plate, for example... Figure 1 As shown. The frame 1 can be equipped with an antenna ground, for example, the bottom plate in the housing can be used as the antenna ground. This antenna ground can form an induced current with the antenna radiator 2 and serve as the reference ground for the antenna.

[0071] Optionally, the antenna radiator 2 is a metallic structure, serving as a carrier of radiated electromagnetic wave energy. Specifically, the first end (or head end) of the first radiator 21 is connected to the second end (or tail end) of the second radiator 22; the first end (or head end) of the second radiator 22 is connected to the second end (or tail end) of the third radiator 23; the first end (or head end) of the third radiator 23 is connected to the second end (or tail end) of the fourth radiator 24; and the first end (or head end) of the fourth radiator 24 is connected to the second end (or tail end) of the first radiator 21. In other words, the antenna radiator 2 is composed of the first radiator 21, the second radiator 22, the third radiator 23, and the fourth radiator 24 connected sequentially from head to tail, forming a ring shape.

[0072] Using frame 1 as Figure 1Taking the shell shown as an example, the frame 1 includes a middle frame and a bottom plate. The first radiator 21 is located on the first surface of the frame 1, which can be understood as the first radiator 21 being approximately perpendicular to the plane where the bottom plate is located. The third radiator 23 is located on the first surface of the frame 1, which can be understood as the third radiator 23 being approximately parallel to the plane where the bottom plate is located. Furthermore, the first part 211 of the first radiator and the first part 231 of the third radiator are arranged along the first side of the frame 1, and the second part 212 of the first radiator and the second part 232 of the third radiator are arranged along the second side of the frame 1, that is, similar to... Figure 2 The flexible circuit board 107 is positioned such that the antenna radiator 2 bypasses the first and second sides of the frame 1 (here, the first and second sides can also be referred to as the "edges" of the frame) and is arranged on the first surface and side surface of the frame 1. This is equivalent to folding the antenna radiator 2 approximately 90°, thereby reducing the planar space occupied by the antenna radiator 2 and ensuring the miniaturization requirement of the antenna radiator 2.

[0073] It should be noted that "approximately perpendicular" and "approximately 90°" in the embodiments of this application can be understood as standard perpendicularity (i.e., 90°) or close to perpendicularity (e.g., a certain range close to 90°, such as (90-α)°~(90+α)°, where α can be a defined error value); similarly, "approximately parallel" can be understood as standard parallelism (i.e., 0°) or close to parallelism (e.g., a certain range close to 0°, such as (0-β)°~(0+β)°, where β can be a defined error value); the embodiments of this application are not limited thereto.

[0074] Optionally, the feed point 25 is located in the middle region of the first radiator 21 or the third radiator 23, and the grounding point 26 is located in the middle region of the first radiator 21 or the third radiator 23, including but not limited to one of the following methods:

[0075] Method 1: Both the feed point 25 and the grounding point 26 are located in the middle region of the first radiator 21, such as... Figure 3b As shown;

[0076] Method 2: Both the feed point 25 and the grounding point 26 are located in the middle region of the third radiator 23, such as... Figure 3c As shown; wherein, the relative positions of the power supply point 25 and the grounding point 26 are not limited, for example, the relative positions of the power supply point 25 and the grounding point 26 can be as follows: Figure 3a As shown, the relative positions of the power supply point 25 and the grounding point 26 can also be as follows: Figure 3c As shown;

[0077] Method 3: The feed point 25 is located in the middle region of the first radiator 21, and the grounding point 26 is located in the middle region of the third radiator 23, as shown below. Figure 3e As shown;

[0078] Method 4: The feed point 25 is located in the middle region of the third radiator 23, and the grounding point 26 is located in the middle region of the first radiator 21, such as... Figure 3d As shown; wherein, the relative positions of the power supply point 25 and the grounding point 26 are not limited, for example, the relative positions of the power supply point 25 and the grounding point 26 can be as follows: Figure 3d As shown, the relative positions of the power supply point 25 and the grounding point 26 can also be as follows: Figure 3f As shown.

[0079] It should be noted that the "intermediate region" is not limited to the center of the first part of the radiator 21 and / or the third part of the radiator 23. It can be understood that the "intermediate region" of the first part of the radiator 21 and / or the third part of the radiator 23 can be the center position, or it can be an error range that deviates from the center position and ensures that the antenna radiator 2 can excite the resonant frequency of the intermediate frequency band in common mode and the resonant frequency of the high frequency band in differential mode.

[0080] For example: the error range can be That is, the range of the intermediate region is: ~ Where 'a' represents the center position of either the first radiator 21 or the third radiator 23. The wavelength of the medium corresponding to the resonant frequency of the antenna radiator 2 operating in the intermediate frequency band.

[0081] Optionally, the intermediate frequency band ranges from 1710MHz to 2170MHz, and may include, but is not limited to, bands B1 and B3. Optionally, the high frequency band ranges from 2300MHz to 2690MHz, and may include, but is not limited to, bands B40 and B41.

[0082] In this embodiment, the antenna radiator 2 is configured by consisting of a first radiator 21, a second radiator 22, a third radiator 23, and a fourth radiator 24 connected end to end. The first radiator 21 is located on the side of the frame 1, the third radiator 23 is located on the first surface of the frame 1, and the first part 211 of the first radiator and the first part 231 of the third radiator are arranged along the first side of the frame 1, while the second part 212 of the first radiator and the second part 232 of the third radiator are arranged along the second side of the frame 1. This reduces the planar space occupied by the antenna radiator 2, thus ensuring the miniaturization requirement of the antenna radiator 2. Furthermore, by setting the feed point 25 of the antenna radiator 2 in the middle region of the first radiator 21 or the third radiator 23, and setting the ground point 26 of the antenna radiator 2 in the middle region of the first radiator 21 or the third radiator 23, it is possible to operate in the intermediate frequency band in common mode and in the high frequency band in differential mode. This achieves coverage of the intermediate and high frequency bands. Moreover, the antenna radiator 2 has the advantages of good radiation efficiency and low SAR in the intermediate and high frequency bands, thereby solving the problem of poor SAR performance of current intermediate and high frequency antennas.

[0083] Optionally, the first part of the radiator 21 has the same length as the third part of the radiator 23, and / or the second part of the radiator 22 has the same length as the fourth part of the radiator 24.

[0084] It should be noted that the first radiator portion 21 and the third radiator portion 23 have the same length, but this is not limited to their lengths being equal or identical. The same length can also mean that the difference in length between the two portions is within an error range that ensures the antenna radiator 2 can excite the resonant frequency in the intermediate frequency band in common-mode mode and the resonant frequency in the high-frequency band in differential-mode mode. Similarly, the second radiator portion 22 and the fourth radiator portion 24 have the same length, but this is not limited to their lengths being equal or identical. The same length can also mean that the difference in length between the two portions is within an error range that ensures the antenna radiator 2 can excite the resonant frequency in the intermediate frequency band in common-mode mode and the resonant frequency in the high-frequency band in differential-mode mode. Thus, the antenna radiator 2 can be configured as a symmetrical structure along the first and second sides.

[0085] For example, the ratio between the length of the first part radiator 21 and the length of the third part radiator 23 can be set to be in the range of 0.8 to 1.2, and / or the ratio between the length of the second part radiator 22 and the length of the fourth part radiator 24 can be set to be in the range of 0.8 to 1.2, etc., but the embodiments of this application are not limited thereto.

[0086] Optionally, such as Figure 3b and Figure 3cAs shown, the lengths of the first portion 211 and the second portion 212 of the first radiator can also be set to be approximately equal, for example, the lengths of the first portion 211 and the second portion 212 of the first radiator are equal, or the lengths of the first portion 211 and the second portion 212 of the first radiator are the same. Alternatively, the length difference between the lengths of the first portion 211 and the second portion 212 of the first radiator can be within an error range that ensures the antenna radiator 2 can excite the resonant frequency of the intermediate frequency band in common-mode mode and the resonant frequency of the high frequency band in differential-mode mode. Similarly, the lengths of the first portion 231 and the second portion 232 of the third radiator can also be set to be approximately equal, for example, the lengths of the first portion 231 and the second portion 232 of the third radiator are equal, or the lengths of the first portion 231 and the second portion 232 of the third radiator are the same. Alternatively, the difference between the length of the first part 231 and the length of the second part 232 of the third radiator can be within an error range that ensures the antenna radiator 2 can excite the resonant frequency in the intermediate frequency band in common mode and the resonant frequency in the high frequency band in differential mode. In this way, the antenna radiator 2 can further form a symmetrical structure on the side of the frame 1, that is, the portion of the antenna radiator arranged along the first side and the portion along the second side of the antenna radiator 2 are symmetrical.

[0087] For example, the length of the first portion 211 of the first radiator and the length of the second portion 212 of the first radiator satisfy the following: ;

[0088] And / or,

[0089] The lengths of the first portion 231 and the second portion 232 of the third radiator satisfy the following: ;

[0090] in, The length of the first portion 211 of the first radiator. The length of the second part 212 of the first part of the radiator; The length of the first part 231 of the third radiator. The length of the second part 232 of the third part radiator.

[0091] In this embodiment, the antenna radiator 2 is arranged in a symmetrical structure to excite the resonant frequency of the intermediate frequency band in common mode and the resonant frequency of the high frequency band in differential mode. Furthermore, arranging the antenna radiator 2 in a symmetrical structure at the corners of the frame 1 can reduce the SAR value.

[0092] Optionally, the antenna radiator 2 operates in a quarter-wavelength mode in the mid-frequency band, and / or, the antenna radiator 2 operates in a half-wavelength mode in the high-frequency band.

[0093] For example, when both the feed point 25 and the ground point 26 are located in the middle region of the first radiator 21 or the third radiator 23, the current path of the antenna radiator 2 in common-mode is as follows: Figure 4 As shown by the dashed arrow, see [link / reference]. Figure 3c and Figure 4 As shown, when the antenna radiator 2 operates in the intermediate frequency band, it satisfies the following: ;

[0094] in, The length of the first portion 211 of the first radiator. The length of the first part 231 of the third radiator. The length of the second part of the radiator 22, This is the shortest distance from the grounding point 26 to the antenna ground. The wavelength of the medium corresponding to the resonant frequency of the antenna radiator 2 operating in the intermediate frequency band.

[0095] Considering that the antenna radiator 2 has a symmetrical structure, when the antenna radiator 2 operates in the intermediate frequency band, it can also satisfy the following: ;

[0096] in, The length of the second part 212 of the first radiator. The length of the second part 232 of the third radiator. This is the length of the fourth part, radiator 24.

[0097] Alternatively, when the antenna radiator 2 operates in the intermediate frequency band, it operates at one-quarter frequency. The current path of the mode can also be quantified and approximated as half the total length of the antenna radiator 2.

[0098] For example, a grounding point is provided on the antenna radiator 2, and a connecting post is usually installed at this grounding point to connect the antenna to the ground. Here It can also refer to the length of the connecting column.

[0099] Optionally, the current path of the antenna radiator 2 in differential mode is as follows: Figure 5 As shown by the dashed arrow, see [link / reference]. Figure 3c and Figure 5 As shown, when the antenna radiator 2 operates in the high-frequency band, it satisfies the following: ;

[0100] in, The length of the first portion 211 of the first radiator. The length of the second part 212 of the first radiator. The wavelength of the medium corresponding to the resonant frequency of the antenna radiator 2 operating in the high-frequency band.

[0101] Considering that the antenna radiator 2 has a symmetrical structure, when the antenna radiator 2 operates in the high-frequency band, it can also satisfy the following: ;

[0102] in, The length of the first part 231 of the third radiator. The length of the second part 232 of the third part radiator.

[0103] In other words, when the antenna radiator 2 operates in the high-frequency band, it operates at half its operating frequency. The current path of the mode can be quantified and equivalent to the length of the first part of the radiator 21 or the length of the third part of the radiator 23.

[0104] It should be noted that, in the embodiments of this application, the length relationship between the first part of the radiator 21 (or the third part of the radiator 23) and the second part of the radiator 22 (or the fourth part of the radiator 24) can be adjusted based on the actual layout space of the electronic device, and it must be ensured that the following conditions are met in the working model mode. or = And satisfying in differential mode or That is, different electronic devices may have different sizes, which may require different lengths of the second part radiator 22 (or the fourth part radiator 24). In such cases, the length of the first part radiator 21 (or the third part radiator 23) can be adjusted accordingly based on the above relationship. This application is not limited to this.

[0105] For example, see Figure 4 As shown, the current distribution of the antenna radiator 2 in common-mode generates dispersed SAR hotspots, i.e., multiple hotspot distributions, with several hotspots distributed near the upper right corner. The current distribution along the edge of the base plate (i.e., antenna ground) is relatively strong because the frame 1 is more fully excited at this time. See, for example... Figure 5As shown, the antenna radiator 2 generates concentrated SAR hotspots in differential mode current distribution, i.e., a single hotspot distribution, concentrated in a single hotspot in the upper right corner. Therefore, considering the effect of balancing antenna efficiency and SAR performance, in this embodiment, when the antenna radiator 2 is arranged at the corner of the frame 1, high efficiency and high SAR performance can be achieved in common mode, thus simultaneously balancing efficiency and SAR performance.

[0106] For ease of description, Figure 3a The antenna radiator 2 shown in ~c is named loop antenna A, which can cover the mid-to-high frequency band. The feed point 25 and ground point 26 of loop antenna A are located in the middle region of the long branch of loop antenna A (here, the long branch is either the first part of radiator 21 or the second part of radiator 23). The relative positions between the feed point 25 and the ground point 26 can be flexibly set, such as... Figure 3a As shown in ~c. Optionally, for ease of layout and to ensure antenna reliability, considering that the loop antenna A has a symmetrical structure, i.e. , In this case, the feed point 25 and the ground point 26 can be located on the top stub of the loop antenna A (i.e., the part of the radiator located on the first side of the frame 1 or the top position), or they can be located on the side stub of the loop antenna A (i.e., the part of the radiator located on the second side of the frame 1 or the second radiator). This application embodiment is not limited to this.

[0107] Table 1 shows the performance of the loop antenna A in the intermediate frequency B3 band compared with that of the conventional IFA antenna. As can be seen from Table 1, the -5dB normalized SAR of the loop antenna A is 0.64 W / kg, while the -5dB normalized SAR of the conventional IFA antenna is 0.94 W / kg. Therefore, the normalized SAR performance of the loop antenna A in this embodiment is significantly improved by approximately 1.5dB.

[0108] Table 1

[0109]

[0110] Optionally, the electronic device further includes: a second matching circuit 5; the feed point 25 is connected to the feed source through the second matching circuit 5, and / or the ground point 26 is connected to the antenna ground through the second matching circuit 5.

[0111] For example, the second matching circuit 5 can be located at grounding point 26, such that one end of the second matching circuit 5 is connected to the grounding point on the antenna radiator 2, and the other end is grounded (e.g., antenna ground). Figure 6aAs shown. Alternatively, the second matching circuit 5 can be located at the feed point 25, such that one end of the second matching circuit 5 is connected to the feed point on the antenna radiator 2, and the other end is connected to the feed source, as shown. Figure 6b As shown. Alternatively, the second matching circuit 5 can also be positioned at the feed point 25 and the ground point 26, such as the first end of the second matching circuit 5 being connected to the ground point on the antenna radiator 2, the second end of the second matching circuit 5 being connected to the feed point on the antenna radiator 2, the third end of the second matching circuit 5 being grounded (e.g., antenna ground), and the fourth end of the second matching circuit 5 being connected to the feed source, etc. Figure 6c As shown.

[0112] Optionally, the second matching circuit 5 may include at least one tuning branch. For example, each tuning branch may be at least one or a combination of capacitors, inductors, and switches. The specific selection can be based on the actual design, and this application embodiment does not impose specific limitations on this.

[0113] In this embodiment, a second matching circuit 5 is provided on the loop antenna A, which can further optimize the impedance performance of the loop antenna A in the mid-to-high frequency range, so that the loop antenna A can have good antenna performance in multiple frequency bands in the mid-to-high frequency range.

[0114] In summary, the loop antenna A provided in this application has the characteristics of high performance. Compared with the traditional IFA antenna, it has high free efficiency and good SAR performance in the mid-frequency band. As shown in Table 1, the SAR performance is improved by 1.5dB. It also has the characteristics of miniaturization, reducing the space occupied by electronic equipment.

[0115] For ease of description, Figure 3d The antenna radiator 1 shown in ~f is named loop antenna B. The feed point 25 and ground point 26 of loop antenna B are located on two long branches (here, the long branches are the first part of the radiator 21 or the second part of the radiator 23), and are located in the middle region of the long branches. That is, the feed point 25 is located on one long branch and the ground point 26 is located on the other long branch.

[0116] Optionally, if one of the feed point 25 and the ground point 26 is located in the middle region of the first partial radiator 21, and the other of the feed point 25 and the ground point 26 is located in the middle region of the third partial radiator 23, the antenna radiator 2, when operating in the intermediate frequency band, satisfies the following: ;

[0117] in, The length of the first portion 211 of the first radiator. This is the shortest distance from the grounding point 26 to the antenna ground. The wavelength of the medium corresponding to the resonant frequency of the antenna radiator 2 operating in the intermediate frequency band.

[0118] like Figure 7a The diagram shows the current distribution of the loop antenna B in the intermediate frequency band. The antenna resonates in common-mode, and its current path is as follows. Figure 7a As shown by the dashed arrow, taking the grounding point 26 located in the middle region of the first radiator 21 and the feed point 25 located in the middle region of the third radiator 23 as an example, when the loop antenna B operates in the intermediate frequency band, it satisfies the following: ;

[0119] in, The length of the first portion 211 of the first radiator. This is the shortest distance from the grounding point 26 to the antenna ground. The wavelength of the medium corresponding to the resonant frequency of the antenna radiator 2 operating in the intermediate frequency band.

[0120] Considering that the antenna radiator 2 has a symmetrical structure, the loop antenna B can also satisfy the following when operating in the intermediate frequency band: ,or ,or ;

[0121] in, The length of the second part 212 of the first radiator. The length of the first part 231 of the third radiator. The length of the second part 232 of the third radiator. The length of the second part of the radiator 22, The length of the fourth part, radiator 24. .

[0122] In other words, when the loop antenna B operates in the intermediate frequency band, it operates at one-quarter of the frequency band. The current path of the mode can be quantified as one-quarter of the total length of the antenna radiator 2.

[0123] like Figure 7b The diagram shows the current distribution of the loop antenna B in the high-frequency band. The antenna resonates in differential mode, and its current path is as follows. Figure 7b As shown by the dashed arrow, similar to loop antenna A, loop antenna B, when operating in the high-frequency band, satisfies the following: = ;

[0124] in, The length of the first portion 211 of the first radiator. The length of the second part 212 of the first radiator. The wavelength of the medium corresponding to the resonant frequency of the antenna radiator 2 operating in the high-frequency band.

[0125] Considering that the loop antenna B has a symmetrical structure, when the loop antenna B operates in the high-frequency band, it can also satisfy the following: = ;

[0126] in, The length of the first part 231 of the third radiator. The length of the second part 232 of the third part radiator.

[0127] In other words, when the loop antenna B operates in the high-frequency band, it operates at half its operating frequency. The current path of this mode can be quantified and equivalently represented by the length of the first radiator 21 or the length of the third radiator 23. The wavelength of the medium corresponding to the resonant frequency in the high-frequency band.

[0128] like Figure 8 The diagram shows the radiation efficiency of loop antenna B. It can be seen that loop antenna B further improves the radiation efficiency at mid-to-high frequencies compared to loop antenna A. Therefore, loop antenna B has higher radiation efficiency at mid-to-high frequencies and good SAR performance at mid-frequency.

[0129] Optionally, the electronic device further includes: a second matching circuit 5;

[0130] The feed point 25 is connected to the feed source through the second matching circuit 5, and / or the ground point 26 is connected to the antenna ground through the second matching circuit 5.

[0131] For example, the second matching circuit 5 can be located at grounding point 26, such that one end of the second matching circuit 5 is connected to the grounding point on the antenna radiator 2, and the other end is grounded (e.g., antenna ground). Figure 6d As shown. Alternatively, the second matching circuit 5 can be located at the feed point 25, such that one end of the second matching circuit 5 is connected to the feed point on the antenna radiator 2, and the other end is connected to the feed source, as shown. Figure 6e As shown. Alternatively, the second matching circuit 5 can also be positioned at the feed point 25 and the ground point 26, such as the first end of the second matching circuit 5 being connected to the ground point on the antenna radiator 2, the second end of the second matching circuit 5 being connected to the feed point on the antenna radiator 2, the third end of the second matching circuit 5 being grounded (e.g., antenna ground), and the fourth end of the second matching circuit 5 being connected to the feed source, etc. Figure 6f As shown.

[0132] Optionally, the second matching circuit 5 may include at least one tuning branch. For example, each tuning branch may be at least one or a combination of capacitors, inductors, and switches. The specific selection can be based on the actual design, and this application embodiment does not impose specific limitations on this.

[0133] In this embodiment, a second matching circuit 5 is provided on the loop antenna B, which can further optimize the impedance performance of the loop antenna B in the mid-to-high frequency range, so that the loop antenna B can have good antenna performance in multiple frequency bands in the mid-to-high frequency range.

[0134] In summary, the loop antenna B in this embodiment has high performance characteristics. Compared with the traditional IFA antenna, it has high free efficiency, good SAR performance in the mid-frequency band, and miniaturization characteristics. Compared with the loop antenna A, it further improves the antenna's radiation efficiency in the mid-to-high frequency band.

[0135] Optionally, such as Figure 9a As shown in ~h, a slit 201 is provided on the antenna radiator 2; the electronic device further includes: a filter circuit 3 or a first matching circuit 4; the filter circuit 3 or the first matching circuit 4 is connected to the two ends of the slit 201 formed on the antenna radiator 2; wherein, the antenna radiator 2 also operates in the low frequency band.

[0136] Optionally, the low-frequency band ranges from 690MHz to 960MHz.

[0137] Optionally, the filter circuit 3 may be an integrated LC filter circuit. The filter circuit 3 is connected to both ends of the antenna radiator 2 that form the gap 201. Alternatively, one port of the integrated LC filter circuit may be connected to one end of the antenna radiator 2 that forms the gap 201, and the other port of the integrated LC filter circuit may be connected to the other end of the antenna radiator 2 that forms the gap 201.

[0138] For example, in order to enable the filter circuit 3 to have good transmission performance in the mid-to-high frequency range and form a stopband in the low frequency range, the filter circuit 3 can be selected as a high-pass low-impedance type, or a high-frequency bandpass type, or a low-frequency bandstop type, etc. The embodiments of this application are not limited thereto.

[0139] like Figure 10aAs shown, a high-pass, low-impedance filter circuit 3 is presented. The filter circuit 3 specifically includes a first capacitor C1 and a first inductor L1. The first terminal of the first capacitor C1 is formed as a first port P, and the second terminal of the first capacitor C1 is formed as a second port Q. The second terminal of the first capacitor C1 is connected to the first terminal of the first inductor L1, and the second terminal of the first inductor L1 is grounded. Optionally, the values ​​of the first capacitor C1 and the first inductor L1 satisfy: C1 < 1.5pF, and L1 > 6nH. Thus, the filter circuit 3 has a high transmission coefficient at mid-to-high frequencies, but a low transmission coefficient at low frequencies, such as... Figure 11a As shown.

[0140] like Figure 10b As shown, a high-frequency bandpass filter circuit 3 is presented. The filter circuit 3 specifically includes a second capacitor C2 and a second inductor L2. The first terminal of the second capacitor C2 forms a first port P, and the second terminal of the second capacitor C2 is connected to the first terminal of the second inductor L2. The second terminal of the second inductor L2 forms a second port Q. Optionally, the values ​​of the second capacitor C2 and the second inductor L2 satisfy: C2 < 1pF, L2 < 5nH. This results in the filter circuit 3 having a high transmission coefficient at mid-to-high frequencies, but a low transmission coefficient at low frequencies. Figure 11b As shown.

[0141] like Figure 10c As shown, a low-frequency band-stop filter circuit 3 is presented. The filter circuit 3 specifically includes a third capacitor C3 and a third inductor L3. The first terminal of the third capacitor C3 is formed as a first port P, and the second terminal of the third capacitor C3 is formed as a second port Q. The first terminal of the third inductor L3 is connected to the first terminal of the third capacitor C3, and the second terminal of the third inductor L3 is connected to the second terminal of the third capacitor C3. Optionally, the values ​​of the third capacitor C3 and the third inductor L3 satisfy: C3 < 2pF, L3 > 20nH. This results in the filter circuit 3 having a high transmission coefficient at mid-to-high frequencies, but a low transmission coefficient at low frequencies. Figure 11c As shown.

[0142] Optionally, the filter circuit 3 can also employ a distributed capacitor and inductor design, such as... Figure 9eAs shown. Specifically, a first electrode plate is provided on one end face of the slot 201 formed on the antenna radiator 2, and a second electrode plate is provided on the other end face of the slot 201 formed on the antenna radiator 2, thus forming a distributed capacitor C'. Furthermore, a distributed inductor L' is provided on the antenna radiator 2 near the slot 201, for example, formed by a "serpentine" metal sheet or wire. One end of the distributed inductor L' is connected to the antenna radiator 2, and the other end is grounded. Optionally, the distributed capacitor C' and the distributed inductor L' should satisfy the following: the equivalent capacitance of the distributed capacitor C' is <1.5pF, and the equivalent inductance of the distributed inductor L' is >6nH.

[0143] In this embodiment, the filter circuit 3 is designed to have a high transmission coefficient in the mid-to-high frequency range. This means that even after the slot 201 is opened, the antenna radiator 2 remains equivalent to a loop antenna under the action of the filter circuit 3, thus ensuring its coverage of the mid-to-high frequency band. Furthermore, the filter circuit 3 is designed to have a low transmission coefficient in the low frequency range, essentially functioning as an open circuit, thereby ensuring that the antenna radiator 2 can form a quarter-circuit antenna. The resonant path (here) The wavelength of the medium corresponding to the resonant frequency of the low-frequency band of the antenna radiator 2 is defined as the wavelength of the medium. By opening a slit 201 on the antenna radiator 2 and setting a filter circuit 3 at the slit 201, the antenna radiator 2 can operate in the mid-frequency band and the high-frequency band, while also being compatible with and covering the low-frequency band. That is, the antenna radiator 2 can operate in the low-frequency band and the mid-to-high-frequency band.

[0144] Optionally, the first matching circuit 4 can be a combination of at least one of a capacitor, an inductor, and a switch. Taking the first matching circuit 4 as a switch as an example, the switch can be connected in series on the antenna radiator 2 to form the two ends of the gap 201. For example, when the antenna radiator 2 needs to operate in the mid-frequency band or high-frequency band, the switch can be controlled to be in the conducting state, that is, the antenna radiator 2 after the gap 201 is opened is still equivalent to a loop antenna, thus ensuring that it can cover the mid-frequency band; when the antenna radiator 2 needs to operate in the low-frequency band, the switch can be controlled to be in the disconnected state, that is, the antenna radiator 2 forms an open circuit at the gap 201, thereby ensuring that the antenna radiator 2 can form a quarter-circuit. The resonant path (here) The wavelength of the medium corresponding to the resonant frequency of the antenna radiator 2 in the low-frequency band is defined, thus enabling the antenna radiator 2 to operate in both low-frequency and mid-to-high-frequency bands. Furthermore, using a switch as the first matching circuit 4, compared to the scheme using a filter circuit 3, further allows for flexible adjustment of the electrical dimensions of the antenna resonant mode, ensuring that the resonant frequency of the antenna mode falls better within the desired frequency band.

[0145] Optionally, when both the feed point 25 and the ground point 26 are located in the first radiator 21 or the third radiator 23, the gap 201 is located on the side closer to the feed point 25 and farther from the ground point 26, such as... Figure 9a , Figure 9c , Figure 9d As shown; or, the break 201 is located on the side close to the grounding point 26 and far from the feed point 25, as shown. Figure 9b As shown.

[0146] In this embodiment, by placing the gap 201 on the side closer to the feed point 25 and farther from the ground point 26, or by placing the gap 201 on the side closer to the ground point 26 and farther from the feed point 25, it is ensured that an excitation signal can be generated on the antenna radiator. The pattern is designed to cover low-frequency bands.

[0147] Optionally, the antenna radiator 2 operates in a quarter-wavelength mode in the low-frequency band.

[0148] For example, the current path of the antenna radiator 2 when it operates in the low-frequency band is as follows: Figure 9a and Figure 9b As shown by the dashed arrow, when the antenna radiator 2 operates in the low-frequency band, it satisfies the following: ;

[0149] in, The total length of the antenna radiator 2. This is the shortest distance from the grounding point 26 to the antenna ground. The length of the fracture 201 The wavelength of the medium corresponding to the resonant frequency of the antenna radiator 2 operating in the low-frequency band.

[0150] For ease of description, Figure 9a The antenna shown in ~e is named loop antenna C. Loop antenna C further improves upon the performance coverage of loop antenna A by achieving lower frequency band coverage. Specifically, loop antenna C, based on loop antenna A, incorporates a slit 201 to construct an electrical length that satisfies low-frequency resonance (i.e., a quarter wavelength of the low-frequency frequency). This allows the antenna radiator 2 to generate a resonant mode in the low-frequency band. The minimum electrical length required for low-frequency resonance is approximately a quarter wavelength of the low-frequency frequency. Since the low-frequency frequency is approximately twice the mid-frequency frequency, the location of the slit 201 can be designed based on the electrical length relationship of the resonant mode of the antenna radiator 2 in the mid-frequency band. Figure 9a and Figure 9b As shown. At this time, as Figure 9a and Figure 9bThe two dashed paths in the diagram satisfy the condition that the electrical length is one-quarter of the wavelength in the low-frequency band. Furthermore, by adding a filter circuit 3 or a first matching circuit 4 at the break 201, such as... Figure 9c As shown in ~e, the loop antenna C can achieve coverage compatible with both low-frequency and mid-to-high-frequency bands.

[0151] In this embodiment, the loop antenna C can achieve good performance in both low-frequency and mid-to-high-frequency bands. Compared with loop antenna A and loop antenna B, it does not increase the space occupied by the antenna, and ensures that the resonant mode of the antenna in the mid-frequency band is still the common-mode mode and the resonant mode in the high-frequency band is still the differential-mode mode. Therefore, it can still maintain good SAR performance.

[0152] like Figure 12 As shown, schematic diagrams illustrating the radiation efficiency of antenna radiator 2 and the overall system efficiency at low and high frequencies are presented. Figure 9d The first matching circuit 4 shown takes a switch as an example. At low frequencies, the switch is in the open state, and the antenna radiator 2 operates in a quarter-wavelength resonant mode in the low-frequency band, thus exhibiting good radiation efficiency in the low-frequency band. At mid-to-high frequencies, the switch is in the closed state, and the antenna radiator 2 operates in common-mode in the mid-frequency band and differential-mode in the high-frequency band, also exhibiting good radiation efficiency in the mid-frequency band. Therefore, it can be seen that by designing the gap 201 and adding the filter circuit 3 or the first matching circuit 4, the embodiments of this application can achieve good performance of the antenna radiator 2 at both low and mid-to-high frequencies.

[0153] Figure 13a As shown in Figure ~c, the current distribution of the loop antenna C in the resonant mode at low and mid-high frequencies is illustrated. The resonant mode of the loop antenna C in the low-frequency band is a 1 / 4 wavelength monopole mode, and the current path is as follows. Figure 13a As shown by the dashed arrow in the image; the resonant mode in the intermediate frequency band is the 1 / 4 wavelength common-mode mode of the loop antenna C, and the current path is as follows. Figure 13b As shown by the dashed arrow in the image; the resonant mode in the high-frequency band is the 1 / 2 wavelength differential mode of the loop antenna C, and the current path is as follows. Figure 13c As shown by the dashed arrow, the loop antenna C maintains its resonant modes at mid- and high frequencies while increasing its efficiency coverage in the low-frequency band. Since its resonant mode in the mid-frequency band remains unchanged, the loop antenna C still exhibits good SAR performance in the mid-frequency band.

[0154] Optionally, the electronic device further includes: a second matching circuit 5; the feed point 25 is connected to the feed source through the second matching circuit 5, and / or the ground point 26 is connected to the antenna ground through the second matching circuit 5.

[0155] For example, the second matching circuit 5 can be located at grounding point 26, such that one end of the second matching circuit 5 is connected to the grounding point on the antenna radiator 2, and the other end is grounded (e.g., antenna ground). Figure 14a and Figure 14d As shown. Alternatively, the second matching circuit 5 can be located at the feed point 25, such that one end of the second matching circuit 5 is connected to the feed point on the antenna radiator 2, and the other end is connected to the feed source, as shown. Figure 14b and Figure 14e As shown. Alternatively, the second matching circuit 5 can also be positioned at the feed point 25 and the ground point 26, such as the first end of the second matching circuit 5 being connected to the ground point on the antenna radiator 2, the second end of the second matching circuit 5 being connected to the feed point on the antenna radiator 2, the third end of the second matching circuit 5 being grounded (e.g., antenna ground), and the fourth end of the second matching circuit 5 being connected to the feed source, etc. Figure 14c and Figure 14f As shown.

[0156] In this embodiment, a second matching circuit 5 is provided on the loop antenna C, which can further optimize the impedance performance of the loop antenna C in the mid-to-high frequency range, so that the loop antenna C can have good antenna performance in multiple frequency bands in the mid-to-high frequency range.

[0157] In summary, the loop antenna C, based on the loop antenna A described above, incorporates a slot 201 and a filter circuit 3 or a first matching circuit 4 at the slot 201 location, achieving performance coverage in both the low-frequency and mid-to-high-frequency bands. Simultaneously, the antenna exhibits good SAR performance in the mid-frequency band. Furthermore, the loop antenna C is characterized by high performance, further improving efficiency in the low-frequency band compared to loop antennas A and B, resulting in good performance in the low-frequency band while maintaining efficiency in the mid-to-high-frequency band and low SAR performance in the mid-frequency band. The loop antenna C is also characterized by miniaturization, requiring no additional space compared to loop antennas A and B. Moreover, the loop antenna C is low-cost; by setting a feed point, a ground point, and at most two matching circuits (or one matching circuit and one filter circuit) on the loop antenna radiator 2, coverage in both the low-frequency and mid-to-high-frequency bands can be achieved, resulting in lower costs compared to separately designed low-frequency and mid-to-high-frequency antennas.

[0158] Optionally, when the feed point 25 is located at one of the first partial radiator 21 and the third partial radiator 23, and the ground point 26 is located at the other of the first partial radiator 21 and the third partial radiator 23, the radiator length from the feed point 25 to the gap 201 satisfies: ;

[0159] in, The length of the radiator from the feed point 25 to the gap 201. The length of the first part of the radiator 21 or the third part of the radiator 23.

[0160] See Figure 9f As shown, This represents the length of the radiator from the feed point 25 to the gap 201, or the length of the antenna radiator traversed by the feed point 25 to the gap 201. The length of the first portion of the radiator 21 or the third portion of the radiator 23, or ,or .

[0161] In this embodiment, when the feed point 25 is located in one of the first partial radiator 21 and the third partial radiator 23, and the ground point 26 is located in the other of the first partial radiator 21 and the third partial radiator 23, the radiator length from the feed point 25 to the gap 201 is designed to satisfy: That is, a gap 201 is opened near the feed point 25, so that the electrical length from the grounding point 26 to the gap 201 is effectively lengthened, such as Figure 15 As shown by the dashed arrow, the actual distance of its current path is approximately half the total length of the antenna radiator 2, and its equivalent electrical length is approximately... That is, under such circumstances, it is still possible to excite an electric field on the antenna radiator. The pattern is designed to cover low-frequency bands. Specifically, it is based on... Figure 15 As can be seen from the resonant mode, there is also a portion of current distribution on the stubs of the loop antenna D to the left of the grounding point (directly opposite the open-circuit branch). This current distribution is opposite to the current distribution to the right of the grounding point, forming a common-mode mode. Therefore, this low-frequency mode should also have relatively good SAR performance.

[0162] For ease of description, Figure 9f ~h is named loop antenna D. Loop antenna D improves upon loop antenna B by enhancing performance coverage in the low-frequency band. Specifically, a slot 201 is created on the antenna radiator 2 of loop antenna B near the feed point. The purpose is to construct a quarter-wavelength mode that satisfies low-frequency resonance. For example, since the wavelength of the low-frequency band (e.g., B8) is approximately twice the wavelength of the mid-frequency band, and the wavelength of the even lower-frequency band (e.g., B28) is approximately 1.4 times that of the B8 band, to ensure better antenna performance in the even lower-frequency band (e.g., B28), based on the electrical length relationship of the resonant mode of loop antenna B in the mid-frequency band, the slot 201 is placed near the feed point, and the length D1 of the radiator from the feed point satisfies: ,like Figure 9f As shown. While creating the gap 201, a high-pass filter circuit 3 also needs to be installed at the gap 201 to ensure good transmission performance in the mid-to-high frequency range and band-stop characteristics in the low frequency range. This allows for good antenna coverage in both the low-frequency and mid-to-high frequency bands, such as... Figure 9g As shown. Alternatively, a first matching circuit 4 can be set at the gap 201 to give the loop antenna D better impedance performance, and also to allow the loop antenna D to switch more flexibly between low-frequency and mid-to-high-frequency bands, such as... Figure 9h As shown.

[0163] Optionally, the electronic device further includes: a second matching circuit 5; the feed point 25 is connected to the feed source through the second matching circuit 5, and / or the ground point 26 is connected to the antenna ground through the second matching circuit 5.

[0164] For example, when the feed point 25 is located on the first radiator 21, the slot 201 is positioned close to the feed point 25. In this case, the slot 201 can be located on the first part of the first radiator or on the second part of the first radiator. Similarly, when the feed point 25 is located on the third radiator 23, the slot 201 is positioned close to the feed point 25. In this case, the slot 201 can be located on the first part 231 of the third radiator. Figure 16b As shown in ~d, it can also be located on the second part 232 of the third part radiator, such as Figure 16a As shown.

[0165] For another example, the second matching circuit 5 can be located at grounding point 26, such that one end of the second matching circuit 5 is connected to the grounding point on the antenna radiator 2, and the other end is grounded (e.g., antenna ground). Figure 16c As shown. Alternatively, the second matching circuit 5 can be located at the feed point 25, such that one end of the second matching circuit 5 is connected to the feed point on the antenna radiator 2, and the other end is connected to the feed source, as shown. Figure 16a and Figure 16b As shown. Alternatively, the second matching circuit 5 can also be positioned at the feed point 25 and the ground point 26, such as the first end of the second matching circuit 5 being connected to the ground point on the antenna radiator 2, the second end of the second matching circuit 5 being connected to the feed point on the antenna radiator 2, the third end of the second matching circuit 5 being grounded (e.g., antenna ground), and the fourth end of the second matching circuit 5 being connected to the feed source, etc. Figure 16d As shown.

[0166] In this embodiment, a second matching circuit 5 is provided on the loop antenna D, which can further optimize the impedance performance of the loop antenna D in the mid-to-high frequency range, so that the loop antenna D can have good antenna performance in multiple frequency bands in the mid-to-high frequency range.

[0167] Figure 17 As shown, a schematic diagram of the radiation efficiency of the antenna radiator at low frequencies is given. It can be seen that the radiation efficiency of the loop antenna D is significantly improved in the low-frequency band compared with that of the loop antenna C.

[0168] In this embodiment, the loop antenna D features high performance. Compared to the loop antenna B, it further improves the efficiency in the low-frequency band, enabling the antenna to maintain good performance in the low-frequency band. Simultaneously, it maintains the antenna's efficiency performance in the mid-to-high frequency band and its low SAR performance in the mid-frequency band, while also exhibiting good SAR performance in the low-frequency band. Furthermore, the loop antenna D is miniaturized; compared to the loop antenna B, it does not increase the antenna's footprint and achieves improved performance in the low-frequency band, thus achieving miniaturization. In addition, the loop antenna D is low-cost. It can achieve coverage in both the low-frequency and mid-to-high frequency bands by setting one feed point, one ground point, and at most two matching circuits (or one filter circuit and at most one matching circuit), resulting in lower costs compared to separately designed low-frequency and mid-to-high frequency antennas.

[0169] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0170] Although preferred embodiments of the present application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present application.

[0171] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0172] The above describes the preferred embodiments of this application. It should be noted that those skilled in the art can make several improvements and modifications without departing from the principles described in this application, and these improvements and modifications are also within the protection scope of this application.

Claims

1. An electronic device, characterized in that, include: Frame and antenna radiator; The antenna radiator includes a first part radiator, a second part radiator, a third part radiator, and a fourth part radiator connected end to end; wherein, the first part radiator is located on the side of the frame, the third part radiator is located on the first surface of the frame, and the first part of the first part radiator and the first part of the third part radiator are arranged along the first side of the frame, and the second part of the first part radiator and the second part of the third part radiator are arranged along the second side of the frame; The antenna radiator is provided with a feed point and a ground point. The feed point is located in the middle region of the first part of the radiator or the third part of the radiator, and the ground point is located in the middle region of the first part of the radiator or the third part of the radiator. The antenna radiator operates in the intermediate frequency band in common mode and in the high frequency band in differential mode. The side surface and the first surface are arranged adjacent to each other, and the first side edge and the second side edge are arranged adjacent to each other.

2. The electronic device according to claim 1, characterized in that, The first part of the radiator has the same length as the third part of the radiator, and / or the second part of the radiator has the same length as the fourth part of the radiator.

3. The electronic device according to claim 1, characterized in that, The lengths of the first portion and the second portion of the first radiator satisfy the following: And / or, The lengths of the first portion and the second portion of the third radiator satisfy the following: Wherein, L1 is the length of the first part of the first radiator, L2 is the length of the second part of the first radiator, L1′ is the length of the first part of the third radiator, and L2′ is the length of the second part of the third radiator.

4. The electronic device according to claim 1, characterized in that, The range of the intermediate region is: Where a is the center position of the first part of the radiator or the third part of the radiator, and λ1 is the medium wavelength corresponding to the resonant frequency of the antenna radiator operating in the intermediate frequency band.

5. The electronic device according to claim 1, characterized in that, The antenna radiator operates in a quarter-wavelength mode in the mid-frequency band, and / or the antenna radiator operates in a half-wavelength mode in the high-frequency band.

6. The electronic device according to claim 1 or 5, characterized in that, When both the feed point and the ground point are located in the middle region of the first part of the radiator or the third part of the radiator, the antenna radiator, when operating in the intermediate frequency band, satisfies the following: When one of the feed point and the ground point is located in the middle region of the first part of the radiator, and the other of the feed point and the ground point is located in the middle region of the third part of the radiator, the antenna radiator satisfies the following when operating in the intermediate frequency band: Where L1 is the length of the first part of the first radiator, L ′ 1 is the length of the first part of the third radiator, L3 is the length of the second radiator, W1 is the shortest distance from the grounding point to the antenna ground, and λ1 is the wavelength of the medium corresponding to the resonant frequency of the antenna radiator operating in the intermediate frequency band.

7. The electronic device according to claim 1 or 5, characterized in that, When the antenna radiator operates in the high-frequency band, it satisfies the following: Wherein, L1 is the length of the first part of the first radiator, L2 is the length of the second part of the first radiator, and λ2 is the wavelength of the medium corresponding to the resonant frequency of the antenna radiator operating in the high-frequency band.

8. The electronic device according to claim 1, characterized in that, The antenna radiator has a slit; the electronic device further includes: a filter circuit or a first matching circuit; The filtering circuit or the first matching circuit is connected to both ends of the antenna radiator to form the gap; The antenna radiator also operates in the low-frequency band.

9. The electronic device according to claim 8, characterized in that, When both the feed point and the ground point are located in the first part of the radiator or the third part of the radiator, the break is located on the side closer to the feed point and farther from the ground point, or the break is located on the side closer to the ground point and farther from the feed point.

10. The electronic device according to claim 8, characterized in that, The antenna radiator operates in a quarter-wavelength mode in the low-frequency band.

11. The electronic device according to claim 8 or 10, characterized in that, When the antenna radiator operates in the low-frequency band, it satisfies the following: Where L is the total length of the antenna radiator, W1 is the shortest distance from the grounding point to the antenna ground, d0 is the length of the gap, and λ3 is the wavelength of the medium corresponding to the resonant frequency of the antenna radiator operating in the low-frequency band.

12. The electronic device according to claim 8, characterized in that, When the feed point is located in one of the first and third radiators, and the grounding point is located in the other of the first and third radiators, the radiator length from the feed point to the fracture satisfies: Wherein, D1 is the length of the radiator from the feed point to the fracture, and L0 is the length of the first part of the radiator or the third part of the radiator.

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