Terminal antenna and electronic equipment

Abstract

The embodiment of the invention provides a terminal antenna and electronic equipment, and relates to the field of antennas, the SAR value distribution of the terminal antenna in each direction is relatively uniform, and the SAR value is relatively small. The terminal antenna comprises a first radiator and a second radiator. The electrical length of the first radiator and the second radiator is a first length, and the first length is an integral multiple of a half-wavelength corresponding to a working frequency point of the terminal antenna. The first radiator and the second radiator are both in a closed ring shape. The first radiator and the second radiator are at least partially electrically connected, and the length of the electrical connection part is greater than or equal to one half of the first length. The included angle between the first face and the second face is larger than or equal to 45 degrees and smaller than or equal to 135 degrees. The first radiator is coupled with the feed source through the first feed port. And the position of the first feed port divides the first radiator into two parts of which the electrical lengths are greater than one fourth of the first length. When the terminal antenna works, the feed source feeds a common-mode feed signal into the first radiator through the first feed port.

Description

Technical Field

[0001] This application relates to the field of antennas, and more particularly to a terminal antenna and electronic device. Background Technology

[0002] Specific Absorption Rate (SAR) characterizes the electromagnetic power absorbed or consumed per unit mass of human tissue and can be used to measure the impact of electromagnetic waves on biological tissues. To protect users, most market access requirements stipulate SAR values ​​for electronic devices.

[0003] Generally speaking, the SAR value of an electronic device refers to the maximum SAR value of each surface of the electronic device. For example, among the six surfaces of a mobile phone, the surface with the display screen has the highest SAR value, so the SAR value of the mobile phone is the SAR value of the surface with the display screen.

[0004] According to the law of conservation of energy, when the input power of the terminal antenna in an electronic device is constant, a lower SAR value on one side of the electronic device must correspond to a higher SAR value on the other side, thus resulting in a higher SAR value for the electronic device. Summary of the Invention

[0005] This application provides a terminal antenna and electronic device, which have relatively uniform SAR values ​​in all directions and relatively small SAR values.

[0006] In a first aspect, a terminal antenna is provided, comprising: a first radiator and a second radiator. The electrical lengths of the first and second radiators are a first length, which is an integer multiple of half the wavelength corresponding to the operating frequency of the terminal antenna. Both the first and second radiators are in a closed loop shape. The first and second radiators are at least partially electrically connected, and the length of the electrical connection is greater than or equal to half of the first length. The included angle between a first surface and a second surface is greater than or equal to 45 degrees and less than or equal to 135 degrees, wherein the first surface is the plane containing the first radiator, and the second surface is the plane containing the second radiator. The first radiator is coupled to a feed source through a first feed port. The position of the first feed port divides the first radiator into two parts, each with an electrical length greater than one-quarter of the first length. When the terminal antenna is operating, the feed source feeds a common-mode feed signal to the first radiator through the first feed port.

[0007] Based on this scheme, when the terminal antenna is working, the feed source feeds a common-mode feed signal to the first radiator through the first feed port. Firstly, since the first radiator is a closed loop, and the position of the first feed port divides the first radiator into two parts, each with an electrical length greater than one-quarter of the first length, the electric field excited by the common-mode feed signal between the closed loop structure of the first radiator is distributed on the plane where the first radiator is located. Secondly, the length of the electrical connection between the first and second radiators is greater than or equal to half of the first length, and the angle between the first and second surfaces is greater than or equal to 45 degrees and less than or equal to 135 degrees. Therefore, the electric field excited by the common-mode feed signal between the closed loop structure of the second radiator is distributed on the plane where the second radiator is located. In other words, the electric field excited by the common-mode feed signal between the first and second radiators is distributed on two planes with an angle greater than or equal to 45 degrees and less than or equal to 135 degrees. Compared to an electric field distributed only in a plane, the electric field of the terminal antenna provided in this application is distributed on two planes with an angle greater than or equal to 45 degrees and less than or equal to 135 degrees, resulting in a more uniform spatial distribution. In this way, the SAR value distribution of the terminal antenna in space is more uniform, which is beneficial to reducing the maximum SAR value.

[0008] In one possible implementation, both the first and second radiators are rectangular rings. The first length is the length of the longer side of the rectangular ring. This scheme is beneficial for improving the efficiency of the terminal antenna.

[0009] In one possible implementation, the terminal antenna further includes a third radiator and a fourth radiator. The electrical lengths of both the third and fourth radiators are a first length. Both the third and fourth radiators are closed loops. The third radiator is at least partially electrically connected to the first radiator. The third radiator is also at least partially electrically connected to the fourth radiator. The fourth radiator is also at least partially electrically connected to the second radiator. The lengths at the electrical connections are all greater than or equal to half the first length. The first, second, third, and fourth radiators form a cavity structure. The third radiator is coupled to a feed source through a second feed port, the location of which divides the third radiator into two parts, each with an electrical length greater than one-quarter of the first length. When the terminal antenna is operating, the feed source feeds a common-mode feed signal to the third radiator through the second feed port. The power of the common-mode feed signal fed into the second feed port and the power of the common-mode feed signal fed through the first feed port are both half the input power of the terminal antenna. Based on this scheme, the terminal antenna has a symmetrical structure, which is beneficial for making the SAR value distribution of the terminal antenna in space more uniform and reducing the maximum SAR value.

[0010] In one possible implementation, the terminal antenna further includes a third radiator and a fourth radiator. The electrical lengths of both the third and fourth radiators are the first length. Both the third and fourth radiators are closed loops. The third radiator is at least partially electrically connected to the first radiator. The third radiator is also at least partially electrically connected to the fourth radiator. The fourth radiator is also at least partially electrically connected to the second radiator. The length of each electrical connection is greater than or equal to half of the first length. The first, second, third, and fourth radiators form a cavity structure. Each of the second, third, and fourth radiators has a feed port, and the position of each feed port divides the corresponding radiator into two parts, each with an electrical length greater than one-quarter of the first length. When the terminal antenna is operating, the feed source feeds a common-mode feed signal to the corresponding radiator through each feed port. The power of the common-mode feed signal fed into each feed port is one-quarter of the input power of the terminal antenna. Based on this scheme, the terminal antenna structure is completely symmetrical, which helps to make the SAR value distribution of the terminal antenna in space more uniform and reduce the maximum SAR value.

[0011] In one possible implementation, the common-mode feed voltages of the electrically connected radiators are of equal amplitude and out of phase. Alternatively, the common-mode feed voltages of the radiators are of equal amplitude and in phase. This scheme is beneficial for improving the efficiency of the terminal antenna.

[0012] In one possible implementation, the first radiator, the second radiator, the third radiator, and the fourth radiator are all in the shape of a rectangular ring. The first length is the length of the long side of the rectangular ring.

[0013] In one possible implementation, the cavity structure is rectangular.

[0014] In one possible implementation, the electrical connection includes a coupled electrical connection, wherein the coupling distance is less than half the first length.

[0015] Secondly, a terminal antenna is provided, including a first radiating structure and a second radiating structure. The first radiating structure includes an annular slot, and the second radiating structure includes a metal patch. A feed source is configured on the first radiating structure. When the terminal antenna is operating, the feed source feeds a common-mode feed signal into the first radiating structure. When the terminal antenna is operating, the angle between a first direction and a second direction is greater than or equal to 45 degrees and less than or equal to 135 degrees. The first direction is the direction of the electric field excited by the common-mode feed signal in the annular slot, and the second direction is the direction of the electric field excited by the common-mode feed signal in the patch. Based on this scheme, by distributing the electric field of the terminal antenna on two planes with an angle greater than or equal to 45 degrees and less than or equal to 135 degrees, the spatial distribution of the electric field of the terminal antenna is made more uniform. Thus, the spatial distribution of the SAR value of the terminal antenna is also more uniform, which is beneficial for reducing the maximum SAR value.

[0016] In one possible implementation, the first radiating structure includes a ground plane, a substrate, a metal frame, and a metal patch. The ground plane and the metal patch are located on opposite sides of the substrate. The metal frame is disposed along the edge of the ground plane and connected to both the ground plane and the metal patch. The ground plane includes a slotted antenna with an annular slot.

[0017] Thirdly, a terminal antenna is provided, comprising four half-wave elements, each in the shape of a cuboid. The length of each half-wave element is an integer multiple of the half-wavelength corresponding to the operating frequency of the terminal antenna. The four half-wave elements are arranged side-by-side in a cuboid shape. The end faces of the four half-wave elements in the same direction are electrically connected. The distance between the sides of adjacent half-wave elements is not zero. Each half-wave element has a feed port, and the position of each feed port divides the corresponding half-wave element into two parts, each with an electrical length greater than one-quarter of the first length. When the terminal antenna is operating, a common-mode feed signal is fed into the corresponding half-wave element through each feed port. The power of the common-mode feed signal fed into each feed port is one-quarter of the input power of the terminal antenna. Based on this scheme, the terminal antenna has a larger geometric size and a symmetrical spatial structure, resulting in a more uniform SAR value distribution, which is beneficial for reducing the maximum SAR value of the terminal antenna.

[0018] Fourthly, an electronic device is provided, the electronic device including a terminal antenna of the first aspect, and / or a terminal antenna of the second aspect, and / or a terminal antenna of the third aspect.

[0019] It should be understood that the technical features of the technical solutions provided in the fourth aspect above can all be corresponding to the terminal antennas provided in the first, second and third aspects, so the beneficial effects that can be achieved are similar, and will not be repeated here. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a mobile phone.

[0021] Figure 2 This is a schematic diagram of a folded oscillator;

[0022] Figure 3 This is a schematic diagram of the SAR value distribution of a mobile phone provided in an embodiment of this application;

[0023] Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application;

[0024] Figure 5 A schematic diagram of a common-mode fed folded oscillator provided for an embodiment of this application;

[0025] Figure 6 A schematic diagram of a differential-mode fed folded oscillator provided in an embodiment of this application;

[0026] Figure 7 A schematic diagram of a folded oscillator parallel to human tissue provided in an embodiment of this application;

[0027] Figure 8 A schematic diagram of a folded oscillator perpendicular to human tissue provided in an embodiment of this application;

[0028] Figure 9 A schematic diagram of the SAR value of a folded oscillator provided in an embodiment of this application;

[0029] Figure 10 This is a schematic diagram of the structure of a terminal antenna provided in an embodiment of this application;

[0030] Figure 11 This application provides a schematic diagram of the SAR value distribution of a terminal antenna in a first direction.

[0031] Figure 12 A schematic diagram of SAR value distribution of a terminal antenna in the second direction, provided as an embodiment of this application;

[0032] Figure 13 A schematic diagram of the casing of a terminal device provided in this application at different angles;

[0033] Figure 14 A schematic diagram of the current and electric field distribution of a terminal antenna during operation is provided in an embodiment of this application;

[0034] Figure 15 This is a schematic diagram of the SAR value distribution of a terminal antenna provided in an embodiment of this application;

[0035] Figure 16 This is a schematic diagram of the structure of another terminal antenna provided in an embodiment of this application;

[0036] Figure 17 This is a schematic diagram of the electric field distribution of a terminal antenna provided in an embodiment of this application;

[0037] Figure 18 A schematic diagram of SAR value distribution for another terminal antenna provided in an embodiment of this application;

[0038] Figure 19 A schematic diagram of SAR value distribution for another terminal antenna provided in an embodiment of this application;

[0039] Figure 20 This is a schematic diagram of the structure of another terminal antenna provided in an embodiment of this application;

[0040] Figure 21 This is a schematic diagram of an equivalent circuit of a power supply structure provided in an embodiment of this application;

[0041] Figure 22 A schematic diagram of the efficiency curve of a terminal antenna provided in an embodiment of this application;

[0042] Figure 23 A schematic diagram of SAR value distribution for another terminal antenna provided in an embodiment of this application;

[0043] Figure 24 This is a schematic diagram of the structure of another terminal antenna provided in an embodiment of this application;

[0044] Figure 25 A schematic diagram of SAR value distribution for another terminal antenna provided in an embodiment of this application;

[0045] Figure 26 This is a schematic diagram of the SAR value distribution of another terminal antenna provided in an embodiment of this application. Detailed Implementation

[0046] In this application's embodiments, terms such as "first," "second," and "third" are used to distinguish different objects, not to limit a specific order. Furthermore, words such as "exemplary" or "for example" are used to indicate that something is being described as an example, illustration, or illustration. Any embodiment or design described as "exemplary" or "for example" in this application's embodiments should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0047] To facilitate understanding of the technical solutions provided in the embodiments of this application, the application background of this application will be introduced below.

[0048] The terminal antenna in an electronic device displays SAR values ​​on all sides of the device. Due to the structure of the terminal antenna, the SAR value distribution on different sides of the electronic device may vary considerably. The following section will use a mobile phone as an example to introduce the different sides of a mobile phone.

[0049] Please refer to Figure 1 This is a schematic diagram of a mobile phone. (Example) Figure 1 As shown, the phone comprises six sides. The side containing the front-facing camera 101 can be referred to as the front side or front of the phone. The side containing the battery cover 103 can be referred to as the back side or back of the phone. The side containing the charging port 104 can be referred to as the bottom side or bottom of the phone. The side opposite the side containing the charging port 104 is called the top side or top surface of the phone. Of the remaining two sides, when the user is facing the display screen 102, the side to the left of the display screen 102 is called the left side or left face of the phone, and the side to the right of the display screen 102 is called the right side or right face of the phone.

[0050] The terminal antenna in a mobile phone is a planar antenna structure, such as a folded-dipole antenna. The SAR values ​​on the six sides of the phone differ significantly. Please refer to [reference needed]. Figure 2 This is a schematic diagram of a folded oscillator. For example... Figure 2 As shown, the folded oscillator is a planar structure, shaped like a rectangular ring. The longer side of the rectangle is half the wavelength of the electromagnetic wave. The shorter side of the rectangle is much shorter than the longer side. For example, the shorter side of the rectangle in the folded oscillator is less than or equal to one-tenth of the longer side.

[0051] In the embodiments of this application, the folded oscillator can also be called a half-wavelength folded oscillator, a planar half-wavelength folded oscillator, etc., without limitation. The long side of the folded oscillator can also be called the oscillator arm of the folded oscillator.

[0052] For example, the terminal antenna in the mobile phone is a planar half-wavelength folded dipole, the feed port is located at the midpoint of the long side, and when common-mode feeding is used, the SAR value distribution of the mobile phone in the back plane and top plane can be as follows: Figure 3 As shown. By Figure 3 It can be seen that the SAR value of the back side of the phone is 1.16W / kg, and the SAR value of the top side is 0.348W / kg, with a relatively large difference between the two sides.

[0053] The SAR value of an electronic device refers to the maximum SAR value of each surface of the electronic device. For example, in the above... Figure 3 In the example shown, if the SAR values ​​of all other sides of the phone are less than 1.16 W / kg, then the SAR value of the phone is 1.16 W / kg. According to the law of conservation of energy, when the input power of the terminal antenna in an electronic device remains constant, a low SAR value on one side of the electronic device necessarily corresponds to a high SAR value on another side. Therefore, when the SAR value distributions of different sides of an electronic device differ significantly, it will lead to a higher SAR value for the electronic device, affecting market access and human health.

[0054] To address the aforementioned problems, this application provides a terminal antenna and an electronic device. When this terminal antenna is installed in an electronic device such as a mobile phone, it can reduce the maximum SAR value on each surface of the electronic device, thereby making the SAR value distribution on each surface of the electronic device more uniform.

[0055] The terminal antenna provided in this application embodiment can be disposed in an electronic device. The electronic device can be a mobile phone, tablet computer, wearable device (such as a smartwatch), in-vehicle device, laptop computer, or other terminal device. As an example, please refer to... Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0056] like Figure 4 As shown, the electronic device may include a processor 401, a communication module 402, and an antenna module 403, etc.

[0057] The processor 401 may include one or more processing units. For example, the processor 401 may include an application processor (AP), a modem processor, a graphics processing unit (GPU), an image signal processor (ISP), a controller, a memory, a video stream codec, a digital signal processor (DSP), a baseband processor, and / or a neural network processing unit (NPU), etc.

[0058] The communication module 402 may include at least one filter, switch, power amplifier, low-noise amplifier (LNA), modem processor, baseband processor, etc. Figure 4 (Not shown in the image).

[0059] Antenna module 403 may include multiple antennas. Communication module 402 transmits and receives electromagnetic wave signals through antenna module 403. Each antenna can be used to cover one or more communication frequency bands.

[0060] The communication module 402 is coupled to the antenna module 403, enabling the electronic device to communicate with networks and other devices via wireless communication technology. This wireless communication technology may include Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Time-Division Code Division Multiple Access (TD-SCDMA), Long Term Evolution (LTE), BT, GNSS, WLAN, NFC, FM, and / or IR technologies. The GNSS may include Global Positioning System (GPS), Global Navigation Satellite System (GLONASS), BeiDou Navigation Satellite System (BDS), Quasi-Zenith Satellite System (QZSS), and / or Satellite Based Augmentation Systems (SBAS).

[0061] It is understood that the structure illustrated in this embodiment does not constitute a specific limitation on the electronic device. In other embodiments, the electronic device may include more or fewer components than illustrated, or combine some components, or split some components, or have different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0062] This application provides a terminal antenna, including a first radiator and a second radiator. The electrical lengths of the first and second radiators are equal to a first length, which is an integer multiple of half the wavelength corresponding to the operating frequency of the terminal antenna. Both the first and second radiators are in a closed loop shape. The first and second radiators are at least partially electrically connected, and the length of the connection is greater than or equal to half of the first length. The included angle between a first surface and a second surface is greater than or equal to 45 degrees and less than or equal to 135 degrees. The first surface is the plane containing the first radiator, and the second surface is the plane containing the second radiator. The first radiator is coupled to a feed source through a first feed port. The position of the first feed port divides the first radiator into two parts, each with an electrical length greater than one-quarter of the first length. When the terminal antenna is operating, the feed source feeds a common-mode feed signal to the first radiator through the first feed port.

[0063] When the terminal antenna provided in this embodiment is in operation, the feed source feeds a common-mode feed signal to the first radiator through the first feed port. Firstly, since the first radiator is a closed loop and the position of the first feed port divides the first radiator into two parts, each with an electrical length greater than one-quarter of the first length, the electric field excited by the common-mode feed signal between the closed loop structure of the first radiator is distributed on the plane where the first radiator is located. Secondly, the length of the electrical connection between the first and second radiators is greater than or equal to half of the first length, and the angle between the first and second surfaces is greater than or equal to 45 degrees and less than or equal to 135 degrees. Therefore, the electric field excited by the common-mode feed signal between the closed loop structure of the second radiator is distributed on the plane where the second radiator is located. In other words, the electric field excited by the common-mode feed signal between the first and second radiators is distributed on two planes with an angle greater than or equal to 45 degrees and less than or equal to 135 degrees. Compared to an electric field that is only distributed in a plane, the electric field of the terminal antenna provided in this application is distributed on two planes with an included angle of 45 degrees or greater and 135 degrees or less, resulting in a more uniform spatial distribution. Consequently, the SAR value distribution of the terminal antenna in space is also more uniform, which is beneficial for reducing the maximum SAR value.

[0064] The following section provides a detailed description of the terminal antenna provided in the embodiments of this application, taking the example that both the first radiator and the second radiator are folded dipoles.

[0065] The terminal antenna provided in this application embodiment is based on a folded dipole. For ease of understanding, the characteristics of the folded dipole are first described below. The structure of the folded dipole described below is as follows: Figure 2 As shown, the power supply port is located at the midpoint of the long side.

[0066] There are at least two types of feeding methods for folded oscillators: common-mode feeding and differential-mode feeding.

[0067] Please refer to Figure 5 This is a schematic diagram of a common-mode fed folded oscillator provided in an embodiment of this application. Figure 5 As shown, when the feed port 502 receives common-mode feed, the currents on the two arms of the folded dipole 501 are in opposite directions. It should be understood that the currents on the folded dipole 501 are as follows: Figure 5 When the distribution is as shown, a relatively strong electric field will be generated between the two arms of the folded oscillator 501 (e.g., ...). Figure 5 (As shown by the dashed arrow in the image).

[0068] Please refer to Figure 6 This is a schematic diagram of a differential-mode fed folded oscillator provided in an embodiment of this application. Figure 6 As shown, when the feed port 602 receives differential mode feed, the currents on the two arms of the folded dipole 601 are in the same direction. It should be understood that the currents on the folded dipole 601 are as follows: Figure 6 When the distribution is shown, there is essentially no electric field distribution between the two arms of the folded oscillator 601.

[0069] Please refer to Figure 7 This is a schematic diagram illustrating a folded oscillator parallel to human tissue, provided in an embodiment of this application. Figure 7 It can be seen that the folded oscillator being parallel to human tissue means that the plane in which the folded oscillator is located is parallel to human tissue.

[0070] Please refer to Figure 8 This is a schematic diagram of a folded oscillator perpendicular to human tissue, provided in an embodiment of this application. Figure 8 It can be seen that the folded oscillator being perpendicular to human tissue means that the plane in which the folded oscillator is located is perpendicular to human tissue.

[0071] Based on the electric field boundary conditions at the air-to-human-skin interface, it is known that when an electric field enters human tissue, the normal electric field relative to the tissue is significantly weakened, while the tangential electric field relative to the tissue can penetrate directly. In other words, when the electric field generated by the terminal antenna is perpendicular to the human tissue, the SAR value at the tissue is lower because the field is significantly weakened. When the electric field generated by the terminal antenna is parallel to the human tissue, the SAR value at the tissue is higher because the field penetrates directly.

[0072] Therefore, it should be understood that, since there is essentially no electric field distribution between the two arms of the folded oscillator, the SAR value at the human tissue is not significantly different when the differential-mode fed folded oscillator is perpendicular to the human tissue compared to when it is parallel to the human tissue. However, when the common-mode fed folded oscillator is perpendicular to the human tissue, the electric field between the two arms is perpendicular to the human tissue and is significantly weakened, resulting in a lower SAR value at the human tissue. When the common-mode fed folded oscillator is parallel to the human tissue, the electric field between the two arms is parallel to the human tissue and can directly penetrate the human body, thus resulting in a higher SAR value at the human tissue. In other words, when a common-mode fed folded oscillator is installed in electronic equipment, the SAR values ​​of the electronic equipment vary considerably across different surfaces.

[0073] The above conclusions are verified through a simulation experiment. In this simulation experiment, the folded oscillator operates at 3 GHz and is 5 mm away from the human tissue.

[0074] Please refer to Figure 9 This is a schematic diagram of the SAR value of a folded oscillator provided in an embodiment of this application. Figure 9 As shown, when the differential-mode fed folded oscillator is parallel to the human tissue, the maximum SAR value at the human tissue is 12.2 W / kg; when the differential-mode fed folded oscillator is perpendicular to the human tissue, the maximum SAR value at the human tissue is 10.8 W / kg; when the common-mode fed folded oscillator is parallel to the human tissue, the maximum SAR value at the human tissue is 8.12 W / kg; and when the common-mode fed folded oscillator is perpendicular to the human tissue, the maximum SAR value at the human tissue is 3.67 W / kg.

[0075] It can be seen that the SAR value at the human tissue location is relatively small when the differential-mode fed folded oscillator is parallel to and perpendicular to the human tissue. However, the SAR value at the human tissue location is significantly different when the common-mode fed folded oscillator is parallel to and perpendicular to the human tissue. Therefore, the simulation results corroborate the aforementioned conclusions.

[0076] The terminal antenna provided in this application is based on a common-mode fed folded dipole design, which aims to reduce the SAR value difference of the common-mode fed dipole in various directions. The terminal antenna is described in detail below.

[0077] Please refer to Figure 10 This is a schematic diagram of the structure of a terminal antenna provided in an embodiment of this application. Figure 10As shown, the terminal antenna includes a first folded element 1001 and a second folded element 1002. The first folded element 1001 and the second folded element 1002 are of the same size. The arms of the first folded element 1001 and the arms of the second folded element 1002 are joined together, and the planes containing the two folded elements are perpendicular to each other. The terminal antenna uses common-mode feeding, and the feed port 1003 is located at the midpoint of the arm of one of the folded elements. Figure 10 (Taking the example where the feed port 1003 is located at the midpoint of the arm of the first folded element 1001). Furthermore, the feed power of the feed port 1003 is equal to the input power of the terminal antenna.

[0078] Figure 10 In the provided terminal antenna, the first folded element 1001 is the first radiator, the second folded element 1002 is the second radiator, and the feed port 1003 is the first feed port. In this embodiment, both the first folded element 1001 and the second folded element 1002 operate at half the wavelength of their respective frequencies. The length of the electrical connection between the first folded element 1001 and the second folded element 1002 is half the wavelength. The first surface is perpendicular to the second surface, and the feed port 1003 is located at the midpoint of the arm of the first folded element 1002. It should be noted that this is merely an example of a terminal antenna provided in this application and does not represent a limitation of this application.

[0079] Since the arms of the first folded oscillator 1001 and the second folded oscillator 1002 are connected, and the common-mode feed port 1003 is located at the midpoint of the arm of the first folded oscillator 1001, the electric field distribution of the first folded oscillator 1001 and the second folded oscillator 1002 is similar to that of the second folded oscillator 1002. Figure 5 The electric fields of the first folded element 1001 and the second folded element in the terminal antenna provided in this application embodiment are distributed on two mutually perpendicular planes. This ensures a relatively uniform SAR value distribution in all directions for the terminal antenna, which is verified through simulation experiments below.

[0080] In the following simulation, the structure of the terminal antenna is as follows: Figure 10 As shown, the operating frequency is 3GHz. The first direction is perpendicular to the plane where the second folded resonator is located and points away from the connection point between the first and second folded resonators. The second direction is perpendicular to the plane where the first folded resonator is located and points away from the connection point between the first and second folded resonators.

[0081] Please refer to Figure 11 This is a schematic diagram of the SAR value distribution of a terminal antenna in a first direction, provided in an embodiment of this application. Figure 11 As shown, Figure 10When the terminal antenna shown is operating at 3 GHz, the maximum SAR value in the first direction is 6.83 W / kg.

[0082] Please refer to Figure 12 This is a schematic diagram of the SAR value distribution of a terminal antenna in the second direction, provided in an embodiment of this application. Figure 12 As shown, Figure 10 When the terminal antenna shown operates at 3 GHz, the maximum SAR value in the second direction is 7.17 W / kg.

[0083] As can be seen from the above simulation experiments, Figure 10 The SAR values ​​of the terminal antenna shown are relatively uniform in all directions.

[0084] Therefore, when this terminal antenna is installed in electronic devices such as mobile phones, it can reduce the maximum SAR value on each surface of the electronic device, thereby making the SAR value distribution on each surface of the electronic device more uniform.

[0085] Figure 10 In the terminal antenna shown, a feed port can be provided at the midpoint of the arm of the second folded dipole 1002. The feed power of both the feed port of the second folded dipole 1002 and the feed port of the first folded dipole 1001 can be set to half of the input power. Thus, without changing the input power, the electric fields generated by the two folded dipoles are distributed on two perpendicular planes. Therefore, the SAR value distribution of this terminal antenna in all directions is similar to... Figure 10 The terminal antennas shown are similar and relatively uniform. Further details will not be elaborated upon here.

[0086] The above Figure 10 The terminal antenna shown distributes the electric fields generated by the first and second folded dipoles onto two perpendicular planes, resulting in a more uniform SAR value distribution in all directions. Based on this principle, the above... Figure 10 The terminal antenna shown may be modified or extended, as detailed below.

[0087] This application also provides a terminal antenna, including a first radiating structure and a second radiating structure. The first radiating structure includes an annular slot, and the second radiating structure includes a metal patch. A feed source is configured on the first radiating structure. When the terminal antenna is operating, the feed source feeds a common-mode feed signal into the first radiating structure. When the terminal antenna is operating, the angle between the first direction and the second direction is greater than or equal to 45 degrees and less than or equal to 135 degrees. The first direction is the direction of the electric field excited by the common-mode feed signal in the annular slot, and the second direction is the direction of the electric field excited by the common-mode feed signal in the patch.

[0088] In one possible implementation, the first radiating structure includes a ground plane, a substrate, a metal frame, and a metal patch. The ground plane and the metal patch are located on opposite sides of the substrate. The metal frame is disposed along the edge of the ground plane and connects to both the ground plane and the metal patch. The ground plane includes a slotted antenna with an annular slot. This will be described in detail below.

[0089] The antenna is designed onto the housing of the terminal device, based on the above. Figure 10 The terminal antenna shown operates on the same principle, enabling it to distribute SAR values ​​more evenly in all directions.

[0090] Please refer to Figure 13 This is a schematic diagram of the casing of a terminal device provided in this application at different angles. Figure 13 (a) in the figure is a perspective view of the casing of the terminal device. Figure 13 (b) in the diagram is a schematic diagram of the upper surface of substrate 1302. Figure 13 (c) in the diagram is a schematic representation of the surface where floor 1301 is located. It should be noted that... Figure 13 To illustrate this clearly, the dimensions of the components within the electronic device's casing have been enlarged or reduced. Figure 13 The dimensions shown do not constitute a limitation on the actual dimensions of each component.

[0091] like Figure 13 As shown, the housing of the terminal device includes a floor 1301, a substrate 1302, a metal frame 1303, two metal patches 1304, and a slot antenna 1305. The upper surface of the floor 1301 is attached to the lower surface of the substrate 1302. The metal frame 1303 is disposed at the edge of the upper surface of the floor 1301. The metal patches 1304 are disposed on the upper surface of the substrate 1302, connected to the metal frame 1303, and opposite to the slot antenna 1305. The two metal patches 1304, the slot antenna 1305, and the floor 1301 constitute the terminal antenna provided in this embodiment.

[0092] The following is based on Figure 13 The coordinate system O-xyz shown in (a) illustrates the electric field distribution during terminal antenna operation. Please refer to [reference needed]. Figure 14 This is a schematic diagram showing the current and electric field distribution during the operation of a terminal antenna, as provided in an embodiment of this application. Figure 14 As shown in (a), the currents on the slot antenna 1305 and the ground plane 1301 are opposite, therefore an electric field is generated between the slot antenna 1305 and the ground plane 1301, which is mainly concentrated on the xOy plane. Additionally, as... Figure 14As shown in (b), since the metal frame 1303 is connected to the metal patch 1304, and the metal patch 1304 is also connected to the metal frame 1303, the current on the metal patch 1304 is opposite to that on the ground plane 1301. An electric field is generated between the metal patch 1304 and the ground plane 1301, and this electric field is mainly concentrated in the yOz plane.

[0093] That is, the electric field between the slot antenna 1305 and the ground plane 1301, and the electric field between the metal patch 1304 and the ground plane 1301, are distributed on two mutually perpendicular planes. Therefore, Figure 13 The SAR values ​​of the corresponding terminal devices are relatively uniformly distributed across all surfaces. This conclusion will be verified through simulation experiments.

[0094] In the simulation experiments below, the dimensions of both the ground plane 1301 and the substrate 1302 are 160mm * 75mm. The metal frame 1303 has a height of 5mm and a thickness of 1.5mm. The substrate 1302 is an FR4 substrate with a thickness of 0.8mm. The feed port 1306 is a T-coupled feed with a capacitance of 1.2pF. The gap between the slot antenna 1305 and the ground plane 1301 is 1mm. The metal patch has a width of 3.5mm and a length of 20.5mm. Please refer to [reference needed] for the specific dimensions of the slot antenna. Figure 13 (c) The operating frequency of the terminal antenna is 3.5 GHz.

[0095] Please refer to Figure 15 This is a schematic diagram of the SAR value distribution of a terminal antenna provided in an embodiment of this application. Figure 15 (a) in the middle is Figure 13 A schematic diagram showing the SAR value of the slot antenna on the back of the terminal device. Figure 15 (b) in the middle is Figure 13 A schematic diagram of the SAR value of the slot antenna on the top surface of the terminal device. Figure 15 (c) in the middle is Figure 13 A schematic diagram showing the SAR value of the terminal antenna, which consists of a slotted antenna and a metal patch, on the back of the terminal device. Figure 15 (d) in the middle is Figure 13 A schematic diagram showing the SAR value of the terminal antenna, which consists of a slotted antenna and a metal patch, on the top surface of the terminal device.

[0096] like Figure 15 As shown, Figure 13The electric field generated by the slot antenna and the ground plane is mainly distributed on a single plane. Therefore, the SAR value on the back of the terminal device is 2.9 W / kg, while the SAR value on the top surface is 0.693 W / kg, a significant difference. However, after introducing the metal patch, the electric field between the slot antenna and the ground plane and the electric field between the metal patch and the ground plane are distributed on two mutually perpendicular planes. Therefore, the SAR value of the terminal antenna composed of the slot antenna and the metal patch is 1.38 W / kg on the back of the terminal device, while the SAR value on the top surface is 1.09 W / kg, a smaller difference. Therefore, it can be determined that... Figure 13 The SAR values ​​of the corresponding terminal devices are relatively evenly distributed across all surfaces.

[0097] The following describes a terminal antenna provided in an embodiment of this application. In addition to the first and second radiators described in the previous embodiments, this terminal antenna also includes a third and a fourth radiator. The electrical lengths of both the third and fourth radiators are the first length. Both the third and fourth radiators are closed loops. The third radiator is at least partially electrically connected to the first radiator. The third radiator is also at least partially electrically connected to the fourth radiator. The fourth radiator is also at least partially electrically connected to the second radiator. The lengths at the electrical connections are all greater than or equal to half the first length. The first, second, third, and fourth radiators form a cavity structure. The third radiator is coupled to a feed source through a second feed port, the position of which divides the third radiator into two parts, each with an electrical length greater than one-quarter of the first length. When the terminal antenna is operating, the feed source feeds a common-mode feed signal to the third radiator through the second feed port. The power of the common-mode feed signal fed into the second feed port and the power of the common-mode feed signal fed through the first feed port are both half the input power of the terminal antenna. Exemplarily, based on... Figure 10 The terminal antenna shown above, as described above... Figure 16 As shown.

[0098] Please refer to Figure 16 This is a schematic diagram of the structure of another terminal antenna provided in an embodiment of this application. Figure 16 As shown, the terminal antenna includes a first folded element 1601, a second folded element 1602, a third folded element 1603, a fourth folded element 1604, a first feed port 1605, and a second feed port 1606. The four folded elements are identical in size. The arms of the four folded elements are sequentially joined to form a cuboid structure. The four folded elements are distributed on the four sides of the cuboid structure. The two feed ports are respectively located at the midpoints of the arms of two adjacent folded elements. Figure 16(Taking the example where the first feed port 1605 is located at the midpoint of the arm of the first folded oscillator 1601, and the second feed port 1606 is located at the midpoint of the arm of the third folded oscillator 1603.) The feed voltages of the first feed port 1605 and the second feed port 1606 are equal in amplitude and opposite in direction.

[0099] It should also be noted that the feed power of the first feed port 1605 and the second feed port 1606 is the same, which is half of the input power of the terminal antenna.

[0100] Please refer to Figure 17 This is a schematic diagram of the electric field distribution of a terminal antenna provided in an embodiment of this application. Figure 17 (a) in the middle is Figure 16 A schematic diagram of the electric field distribution generated by the first folded element 1601 in the terminal antenna shown. Figure 17 (b) in the middle is Figure 16 A schematic diagram of the electric field distribution generated by the third folded element 1603 in the terminal antenna shown. Figure 17 It can be seen that the electric field generated by the first folded oscillator 1601 is distributed in the plane containing the first folded oscillator 1601, and the electric field generated by the third folded oscillator 1603 is distributed in the plane containing the third folded oscillator 1603. The plane containing the first folded oscillator 1601 and the plane containing the third folded oscillator 1603 are perpendicular to each other, meaning that the electric fields generated by the first folded oscillator 1601 and the third folded oscillator 1603 are distributed on two perpendicular planes. Furthermore, the maximum amplitude of the electric field generated by the first folded oscillator 1601 and the third folded oscillator 1603 is the same. Therefore, Figure 16 The terminal antenna shown exhibits a relatively uniform SAR value distribution in all directions. This conclusion is verified through a simulation experiment. In the simulation experiment, the terminal antenna operates at 3 GHz.

[0101] Please refer to Figure 18 This is a schematic diagram of the SAR value distribution of another terminal antenna provided in an embodiment of this application. Figure 18 It can be seen that, Figure 16 When the first folded element 1601 of the terminal antenna shown is parallel to human tissue, the SAR value of the terminal antenna at the human tissue is 6.83 W / kg.

[0102] Please refer to Figure 19 This is a schematic diagram of the SAR value distribution of another terminal antenna provided in an embodiment of this application. Figure 19 It can be seen that, Figure 16 When the first folded element 1601 of the terminal antenna shown is perpendicular to human tissue, the SAR value of the terminal antenna at the human tissue is 6.7 W / kg.

[0103] The results of the above simulation experiments show that Figure 16 The SAR value distribution of the terminal antenna shown is relatively uniform in all directions. Therefore, when this terminal antenna is installed in the terminal device, the SAR value distribution of the terminal device will also be relatively uniform in all directions.

[0104] In some possible implementations, feed ports can be provided on the first, second, third, and fourth radiators. The location of each feed port divides the corresponding radiator into two parts, each with an electrical length greater than one-quarter of the first length. When the terminal antenna is operating, the feed source feeds common-mode feed signals to the corresponding radiators through each feed port. The power of the common-mode feed signal fed into each feed port is one-quarter of the input power of the terminal antenna.

[0105] For example, in Figure 16 Based on the terminal antenna shown, a third feed port 1607 can be set at the midpoint of the arm of the second folded element 1602, and a fourth feed port 1608 can be set at the midpoint of the arm of the fourth folded element, resulting in the following: Figure 20 The terminal antenna shown.

[0106] like Figure 20 As shown, the terminal antenna has four feed ports. It should be noted that all four feed ports use common-mode feeding, and the feed power of each feed port is one-quarter of the input power of the terminal antenna. The feed structure of this terminal antenna can be equivalent to... Figure 21 The circuit shown. (As shown) Figure 21 As shown, the feed current is divided into four equal paths after passing through the input port, and flows into the four feed ports respectively.

[0107] After simulation experiments, in Figure 20 In the terminal antenna shown, when the feed voltages of the four feed ports are of equal amplitude and in phase, or when the feed voltages of adjacent feed ports are of equal amplitude but out of phase, the S-parameters, efficiency, and input impedance curves of the terminal antenna completely coincide, and the total efficiency at the operating frequency is close to 0dB, reaching 99%. Figure 22 As shown, in Figure 20 The terminal antenna shown operates at 3 GHz, with the amplitude of the feed voltage at each of the four feed ports being 0.5V and the phase being 0°. The efficiency curve for this terminal antenna is curve 1. Figure 20The terminal antenna shown operates at 3GHz, with the feed voltage amplitude at each of the four feed ports being 0.5V. The phase of the first feed port is 0°, the phase of the second feed port is 180°, the phase of the third feed port is 180°, and the phase of the fourth feed port is 0°. The efficiency curve of this terminal antenna is curve 2. Curves 1 and 2 completely overlap, and the overall efficiency at 3GHz is close to 0dB. Therefore, the embodiments of this application can... Figure 20 The feed voltages of the four feed ports in the terminal antenna shown are set to equal amplitude and in phase, or the feed voltages of adjacent feed ports are set to equal amplitude and out of phase to improve the efficiency of the terminal antenna.

[0108] It should be understood that Figure 20 The terminal antenna shown has a symmetrical structure, therefore the SAR value is the same on all surfaces. Furthermore, Figure 20 The terminal antenna shown is Figure 16 The terminal antennas shown have the same input power, therefore Figure 20 The SAR value of the terminal antenna shown is... Figure 16 The SAR values ​​of the terminal antennas shown are basically the same. Simulation results also corroborate this conclusion. Please refer to... Figure 23 This is a schematic diagram of the SAR value distribution of another terminal antenna provided in an embodiment of this application. Figure 23 As shown, Figure 20 When any folded element in the terminal antenna shown is parallel to human tissue, the SAR value of the terminal antenna at the human tissue is 6.67 W / kg, which is consistent with... Figure 16 The terminal antennas shown are basically the same.

[0109] For terminal antennas, given a fixed input power, increasing the geometric structure can reduce the SAR value of the terminal antenna. Based on this principle, the embodiments of this application will... Figure 20 In the terminal antenna shown, the thickness of each folded element is increased to the width of the element arm, thus obtaining the following: Figure 24 The terminal antenna shown.

[0110] Please refer to Figure 24 This is a schematic diagram of the structure of another terminal antenna provided in an embodiment of this application. Figure 24 As shown, the terminal antenna includes four half-wave elements: a first half-wave element 2401, a second half-wave element 2402, a third half-wave element 2403, and a fourth half-wave element 2404. Each of the four half-wave elements is a cuboid with an electrical length of half a wavelength. The four half-wave elements are arranged in parallel, forming a cuboid structure with folded elements on all four sides.

[0111] The terminal antenna also includes four feed ports: a first feed port 2405, a second feed port 2406, a third feed port 2407, and a fourth feed port 2408. These four feed ports are respectively located between the midpoints of the arms of adjacent half-wave dipoles. Figure 24 As shown, the first feed port 2405 is located between the midpoints of the arms of the first half-wave dipole 2401 and the fourth half-wave dipole 2404; the second feed port 2406 is located between the midpoints of the arms of the third half-wave dipole 2403 and the fourth half-wave dipole 2404; the third feed port 2407 is located between the midpoints of the arms of the first half-wave dipole 2401 and the second half-wave dipole 2402; and the fourth feed port 2408 is located between the midpoints of the arms of the third half-wave dipole 2403 and the second half-wave dipole 2402. All four feed ports use common-mode feeding, and the feed power is one-quarter of the input power.

[0112] and Figure 20 The terminal antenna shown is similar; to improve the efficiency of the terminal antenna, it can be... Figure 24 The feed voltages of the four feed ports of the terminal antenna shown are set to equal amplitude and in phase, or the feed voltages of adjacent feed ports among the four feed ports can be set to equal amplitude and out of phase.

[0113] It should be understood that Figure 24 The terminal antenna shown has a symmetrical structure, therefore the SAR value is the same on all surfaces. Furthermore, Figure 24 The terminal antenna shown is Figure 20 The terminal antennas shown have the same input power, but their geometry is larger, therefore Figure 24 The SAR of the terminal antenna shown is smaller than that of the terminal antenna shown. Figure 20 The SAR value of the terminal antenna is shown. The simulation results also support this conclusion.

[0114] In the simulation experiment below, the terminal antenna operates at 3GHz with an input power of 24dBm, which means that the feed power of each of the four feed ports is 6dBm. The width and height of the half-wave dipole are both 1mm, and the distance between adjacent half-wave dipoles is also 1mm.

[0115] When the feed voltage amplitude at all four feed ports is 0.5V and the phase is 0°, Figure 24 The SAR value distribution of the terminal antenna shown is as follows Figure 25 As shown. Figure 25 As shown, when any side of the cuboid-shaped terminal antenna is parallel to human tissue, the SAR value of the terminal antenna at the human tissue is 6.37 W / kg, which is less than... Figure 20 The SAR value of the terminal antenna is shown.

[0116] With the feed voltage amplitude at all four feed ports being 0.5V, and the phase at the first feed port being 0°, the phase at the second feed port being 180°, the phase at the third feed port being 180°, and the phase at the fourth feed port being 0°, Figure 24 The SAR value distribution of the terminal antenna shown is as follows Figure 26 As shown. Figure 26 As shown, when any side of the cuboid-shaped terminal antenna is parallel to human tissue, the SAR value of the terminal antenna at the human tissue is 6.37 W / kg, which is less than... Figure 20 The SAR value of the terminal antenna is shown.

[0117] Based on the simulation results above, it can be seen that Figure 24 The SAR value of the terminal antenna shown is relatively low. Furthermore, due to its symmetrical structure, the SAR value distribution of this terminal antenna is also relatively uniform in all directions. Therefore, when this terminal antenna is installed in a terminal device, the SAR values ​​of the terminal device on all surfaces are small and the distribution is relatively uniform.

[0118] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of this application. Accordingly, this specification and drawings are merely exemplary illustrations of this application as defined by the appended claims, and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from the spirit and scope of this application. Thus, if such modifications and modifications of this application fall within the scope of the claims of this application and their equivalents, this application is also intended to include such modifications and modifications.

Claims

1. A terminal antenna, characterized in that, The terminal antenna includes: a first radiator and a second radiator; The electrical lengths of the first radiator and the second radiator are a first length, which is an integer multiple of half the wavelength corresponding to the operating frequency of the terminal antenna. Both the first radiator and the second radiator are in the form of a closed loop; the first radiator and the second radiator are at least partially electrically connected, and the length of the electrical connection is greater than or equal to half of the first length; The angle between the first surface and the second surface is greater than or equal to 45 degrees and less than or equal to 135 degrees. The first surface is the plane where the first radiator is located, and the second surface is the plane where the second radiator is located. The first radiator is coupled to the feed source through a first feed port; the position of the first feed port divides the first radiator into two parts, each with an electrical length greater than one-quarter of the first length. When the terminal antenna is working, the feed source feeds a common-mode feed signal to the first radiator through the first feed port.

2. The terminal antenna according to claim 1, characterized in that, Both the first radiator and the second radiator are rectangular rings; the first length is the length of the long side of the rectangular ring.

3. The terminal antenna according to claim 1, characterized in that, The terminal antenna further includes a third radiator and a fourth radiator; the electrical lengths of the third radiator and the fourth radiator are both the first length; Both the third radiator and the fourth radiator are in the form of a closed loop; the third radiator is at least partially electrically connected to the first radiator; the third radiator is also at least partially electrically connected to the fourth radiator; the fourth radiator is also at least partially electrically connected to the second radiator; the length of each electrical connection is greater than or equal to half of the first length. The first radiator, the second radiator, the third radiator, and the fourth radiator form a cavity structure; The third radiator is coupled to the feed source through the second feed port, and the position of the second feed port divides the third radiator into two parts, both of which have an electrical length greater than one-quarter of the first length. When the terminal antenna is working, the feed source feeds a common-mode feed signal to the third radiator through the second feed port; wherein, the power of the common-mode feed signal fed into the second feed port and the power of the common-mode feed signal through the first feed port are both half of the input power of the terminal antenna.

4. The terminal antenna according to claim 1, characterized in that, The terminal antenna further includes a third radiator and a fourth radiator; the electrical lengths of the third radiator and the fourth radiator are both the first length; Both the third radiator and the fourth radiator are in the form of a closed loop; the third radiator is at least partially electrically connected to the first radiator; the third radiator is also at least partially electrically connected to the fourth radiator; the fourth radiator is also at least partially electrically connected to the second radiator; the length of each electrical connection is greater than or equal to half of the first length. The first radiator, the second radiator, the third radiator, and the fourth radiator form a cavity structure; The second, third, and fourth radiators are each provided with a power supply port, and the position of each power supply port divides the corresponding radiator into two parts, each with an electrical length greater than one-quarter of the first length. When the terminal antenna is in operation, the feed source feeds common-mode feed signals to the corresponding radiators through each feed port; wherein, the power of the common-mode feed signal fed into each feed port is one-quarter of the input power of the terminal antenna.

5. The terminal antenna according to claim 4, characterized in that, The common-mode feed signals of the radiators connected by electrical connections have equal amplitude and opposite phase; or, the common-mode feed signals of the radiators have equal amplitude and in phase.

6. The terminal antenna according to claim 3 or 4, characterized in that, The first radiator, the second radiator, the third radiator, and the fourth radiator are all rectangular rings; the first length is the length of the long side of the rectangular ring.

7. The terminal antenna according to claim 6, characterized in that, The cavity structure is rectangular.

8. The terminal antenna according to any one of claims 1-7, characterized in that, The electrical connection includes a coupling electrical connection; wherein the coupling distance is less than half of the first length.

9. A terminal antenna, characterized in that, It includes a first radiating structure and a second radiating structure; the first radiating structure includes an annular slit, and the second radiating structure includes a metal patch. The first radiating structure is equipped with a feed source; when the terminal antenna is working, the feed source feeds a common-mode feed signal into the first radiating structure; When the terminal antenna is working, the angle between the first direction and the second direction is greater than or equal to 45 degrees and less than or equal to 135 degrees; the first direction is the direction of the electric field excited by the common-mode feed signal in the annular gap, and the second direction is the direction of the electric field excited by the common-mode feed signal on the patch.

10. The terminal antenna according to claim 9, characterized in that, The first radiating structure includes a floor, a substrate, a metal frame, and a metal patch; the floor and the metal patch are located on opposite sides of the substrate; the metal frame is disposed at the edge of the floor and is connected to both the floor and the metal patch. The floor includes a slot antenna with an annular slot.

11. A terminal antenna, characterized in that, It includes four half-wave dipoles, each of which is in the shape of a cuboid column; the length of each of the four half-wave dipoles is an integer multiple of the half-wavelength corresponding to the operating frequency of the terminal antenna. The four half-wave oscillators are arranged side by side in a rectangular parallelepiped shape; The end faces of the four half-wave dipoles in the same direction are electrically connected; wherein the distance between the sides of adjacent half-wave dipoles is not zero. Each half-wave oscillator is provided with a power supply port, and the position of each power supply port divides the corresponding half-wave oscillator into two parts, both of which have an electrical length greater than one-quarter of the first length. When the terminal antenna is in operation, the feed source feeds common-mode feed signals to the corresponding half-wave dipole through each feed port; wherein, the power of the common-mode feed signal fed into each feed port is one-quarter of the input power of the terminal antenna.

12. An electronic device, characterized in that, The electronic device includes the terminal antenna according to any one of claims 1-8, and / or the terminal antenna according to any one of claims 9-10, and / or the terminal antenna according to claim 11.

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