Antenna and terminal equipment

Abstract

The invention discloses an antenna and terminal equipment. The antenna comprises a feed selection circuit, a first radiation unit located on one side of the feed selection circuit and a second radiation unit located on the other side of the feed selection circuit. The feed selection circuit is connected with the metal ground of the PCB through a feed point; the first radiation unit comprises a first radiation branch connected with the feed selection circuit and a second radiation branch connected with the first radiation branch, and the first radiation branch, the second radiation branch and the feed selection circuit form a current loop; the second radiation unit comprises a third radiation branch connected with the feed selection circuit and a fourth radiation branch connected with the third radiation branch, and the third radiation branch, the fourth radiation branch and the feed selection circuit form a current loop. The current distribution of the antenna is changed by controlling the connection relation between the feed selection circuit and the first radiation unit and the second radiation unit, so that the antenna presents different radiation characteristics, and the requirements of terminal equipment on the radiation characteristics of the antenna in different environments are met.

Description

Technical Field

[0001] The present application relates to the field of antenna technology, and in particular to an antenna and a terminal device. Background Art

[0002] With the explosive development of big data, the promotion of smart homes, and the development of whole-house smart customization, the era of the Internet of Everything has arrived. Antenna technology is the foundation of the Internet of Everything, and its performance is related to multiple indicators such as the system's connection speed, transmission rate, and connection stability. The high bandwidth and high efficiency of the antenna bring users a better, more stable, faster, and wider user experience. With the continuous iteration and diversification of product forms, the working environment of the antenna is different. Each product needs to re-debug and redesign the antenna, and the antenna is not universal.

[0003] The radiation structure of the antenna determines the radiation characteristics of the antenna, especially the radiation pattern. Different products have different requirements for the radiation pattern of the antenna, and it is difficult for a single antenna design to meet product requirements. If multiple antennas are set up to meet the radiation requirements of the product in different scenarios, the cost will be high and it will occupy the volume of the product, which is not conducive to the miniaturization design of the antenna. Summary of the invention

[0004] In order to solve the above-mentioned problems in the prior art, the example of the present application provides an antenna and a terminal device for meeting the requirements for antenna radiation characteristics in multiple scenarios.

[0005] In a first aspect, an embodiment of the present application provides an antenna, comprising a feed selection circuit, a first radiating unit located on one side of the feed selection circuit, and a second radiating unit located on the other side of the feed selection circuit.

[0006] Among them, the feed selection circuit is connected to the metal ground of the PCB board through a feeding point; the first radiating unit includes a first radiating branch connected to the feed selection circuit and a second radiating branch connected to the first radiating branch, and the first radiating branch, the second radiating branch and the feed selection circuit form a current loop; the second radiating unit includes a third radiating branch connected to the feed selection circuit and a fourth radiating branch connected to the third radiating branch, and the third radiating branch, the fourth radiating branch and the feed selection circuit form a current loop.

[0007] An optional implementation is that the first radiating unit further includes a first tuner, the second radiating unit further includes a second tuner, the first radiating branch is connected to the feed selection circuit via the first tuner, and the third radiating branch is connected to the feed selection circuit via the first tuner.

[0008] An optional implementation is that the first radiation branch and the second radiation branch are arranged vertically, and one end of the first radiation branch is connected to an end of the feed selection circuit away from the feeding point through the first tuner; the third radiation branch and the fourth radiation branch are arranged vertically, and one end of the third radiation branch is connected to an end of the feed selection circuit away from the feeding point through the second tuner.

[0009] An optional implementation manner is that there are gaps between the ends of the first radiation branch, the second radiation branch, the third radiation branch and the fourth radiation branch and the peripheral metal ground respectively, forming gap coupling.

[0010] An optional implementation manner is that the first radiation branch is arranged in parallel with the feed selection circuit, and the third radiation branch is arranged in parallel with the feed selection circuit.

[0011] In an optional implementation, the feed selection circuit includes: a first switch and a second switch; the first switch is connected between the first radiation branch and the feed point; and the second switch is connected between the third radiation branch and the feed point.

[0012] An optional implementation is that the antenna provided in the present application also includes a first controller connected to the first switch and the second switch, and the first controller is used to connect to the second controller in the terminal device where the antenna is located, and control the conduction and shutdown of the first switch and the second switch according to a control signal sent by the second controller.

[0013] An optional implementation is that the feed selection circuit is a metal conductor.

[0014] An optional implementation manner is that the distance between the second radiation branch and the metal ground matches the bandwidth requirement of the antenna, and the distance between the fourth radiation branch and the metal ground matches the bandwidth requirement of the antenna.

[0015] In a second aspect, an embodiment of the present application provides a terminal device, which includes the antenna provided in the first aspect of the present application and any possible implementation manner thereof.

[0016] An embodiment of the present application provides an antenna and a terminal device, wherein a first radiating unit and a second radiating unit can both be connected to a feed selection circuit to form a current loop, and the flow directions of the current loops are different. Therefore, the flow direction of the current in the antenna can be adjusted by controlling the connection relationship between the feed selection circuit and the two radiating units, thereby changing the radiation characteristics of the antenna to meet the requirements of the terminal device for the antenna radiation characteristics in different scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 A schematic diagram of an antenna provided in an embodiment of the present application;

[0019] Figure 2 A schematic diagram of another antenna provided in an embodiment of the present application;

[0020] Figure 3 A schematic diagram of a first radiation unit and a second radiation unit provided in an embodiment of the present application;

[0021] Figure 4 A schematic diagram of an antenna current loop provided in an embodiment of the present application;

[0022] Figure 5 A schematic diagram of another antenna current loop provided in an embodiment of the present application;

[0023] Figure 6 A schematic diagram of the structure of a feed selection circuit provided in an embodiment of the present application;

[0024] Figure 7 A schematic diagram of a gap between a second radiation branch and a metal ground provided in an embodiment of the present application;

[0025] Figure 8 A schematic diagram of antenna return loss in a first radiation mode provided in an embodiment of the present application;

[0026] Fig. 9 A schematic diagram of the current of an antenna at an operating frequency of 2.45 GHz in a first radiation mode provided in an embodiment of the present application;

[0027] Fig.10 A schematic diagram of the current of an antenna at an operating frequency of 6 GHz in a first radiation mode provided in an embodiment of the present application;

[0028] Fig.11 A schematic diagram of a gap between a fourth radiation branch and a metal ground provided in an embodiment of the present application;

[0029] Fig.12 A schematic diagram of antenna return loss in a second radiation mode provided in an embodiment of the present application;

[0030] Fig.13A schematic diagram of the current of an antenna at an operating frequency of 2.45 GHz in a second radiation mode provided in an embodiment of the present application;

[0031] Fig.14 A schematic diagram of the current of an antenna at an operating frequency of 6 GHz in a second radiation mode provided in an embodiment of the present application;

[0032] Fig.15 An antenna return loss in a third radiation mode provided in an embodiment of the present application;

[0033] Fig.16 A schematic diagram of the current of an antenna at an operating frequency of 6 GHz in a third radiation mode provided in an embodiment of the present application;

[0034] Fig.17 A schematic diagram of an antenna installation position provided in an embodiment of the present application. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0036] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0038] It should be noted that the switch in the embodiment of the present application can be one or more of various types of switch tubes such as relays, metal oxide semiconductor field effect transistors (metal oxide semiconductor field effect transistors, MOSFET), bipolar junction transistors (bipolar junction transistors, BJT), insulated gate bipolar transistors (insulated gate bipolar transistors, IGBT), silicon carbide (SiC) transistors, etc., and the embodiment of the present application will not list them one by one. The packaging form of each switch can be a single tube package or a multi-tube package, and the embodiment of the present application does not impose many restrictions on this. Each switch can include a first end, a second end and a control end, wherein the control end is used to control the switch tube to be turned on or off. When the switch is turned on, current can be transmitted between the first end and the second end of the switch, and when the switch is turned off, current cannot be transmitted between the first end and the second end of the switch. Taking MOSFET as an example, the control end of the switch is the gate, the first end of the switch can be the source, the second end can be the drain, or the first end can be the drain, and the second end can be the source.

[0039] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0040] WiFi 6E requires the antenna bandwidth to reach 2.1GHz. For the flat printed antenna on the PCB module, the required working bandwidth of the WiFi6E antenna is relatively wide, and the diverse product forms of the devices where the antenna is located lead to different working environments for the antenna. In order to meet the antenna radiation requirements of the product in different working environments, multiple antennas need to be installed on the product. However, the above-mentioned multi-antenna design has high antenna prices, large occupied space, and poor versatility.

[0041] PCB antennas have the advantages of miniaturization, light weight, simple structure and low cost, and can be used in a variety of devices. However, due to the small size of the PCB board, the design of ordinary miniaturized antennas is difficult to meet such bandwidth requirements, and setting up multiple antennas will also occupy a large area of ​​the product.

[0042] In order to solve the above-mentioned problems, the present application proposes an antenna, which changes the current flow direction of the antenna by adjusting the connected radiating branches, and then adjusts the radiation direction of the antenna, thereby achieving the required operating frequency and bandwidth requirements of the antenna while ensuring the miniaturization of the antenna. The antenna proposed in the present application can optimize and improve the antenna performance when there is metal ground on multiple sides of the antenna.

[0043] Figure 1 A schematic diagram of an antenna provided in an embodiment of the present application is shown as follows: Figure 1 As shown, the antenna provided in the embodiment of the present application includes a feed selection circuit K1, a first radiation unit A1 located on one side of the feed selection circuit K1, and a second radiation unit A2 located on the other side of the feed selection circuit K1. The feed selection circuit K1 in the antenna is connected to the metal ground through a feed point P, thereby realizing the connection between the antenna and the metal ground.

[0044] As an optional implementation, the antenna provided in the embodiment of the present application can be located in the clearance area of ​​the above-mentioned PCB substrate. It should be noted that the specific shape and size of the above-mentioned antenna clearance area in the embodiment of the present application can be adjusted according to actual needs, for example, the shape can be rectangular, and the size can be 7.5mm*15mm, and this application does not make too many restrictions here.

[0045] The first radiation unit A1 and the second radiation unit A2 are respectively distributed on both sides of the feed selection circuit K1. For example, the distribution method thereof can be as follows: Figure 1 As shown, the first radiating unit A1 is distributed on the left side of the feed selection circuit K1, and the second radiating unit A2 is distributed on the right side of the feed branch K1. Of course, the distribution method can also be as follows: Figure 2 As shown, the positions of the first radiation unit A1 and the second radiation unit A2 are interchanged, that is, the second radiation unit A2 is distributed on the left side of the feeding branch K1, and the first radiation unit A1 is distributed on the right side of the feeding branch K1.

[0046] Among them, the first radiation unit A1 and the second radiation unit A2 are designed independently and distributed on both sides of the feed selection circuit K1, and the first radiation unit A1 and the second radiation unit A2 can form a current loop with the feed selection circuit K1. Therefore, the radiation direction of the antenna can be changed by controlling the connection between the feed selection circuit K1 and the first radiation unit A1 and the second radiation unit A2, thereby meeting the design requirements for RF characteristics in different environments. In addition, the operating frequency of the antenna reaches 5.925GHz~7.2GHz and 2.4GHz~5GHz, which can meet the high bandwidth requirements of the antenna.

[0047] As an optional implementation, the first radiation unit A1 and the second radiation unit A2 are arranged in parallel and are respectively connected to the two ends of the feed selection circuit K1, which can form a current loop with the metal ground. The distance between the first radiation unit A1 and the metal ground can be adjusted as required, and the distance between the second radiation unit A2 and the metal ground can be adjusted as required, which is not limited in the embodiment of the present application, and the specific distance matches the high-frequency operating frequency and bandwidth of the antenna.

[0048] In a specific implementation, the connection between the feed selection circuit K1 and the two radiating units can be controlled to change the current flow direction of the antenna, thereby changing the radiation performance of the antenna to meet the requirements of the terminal equipment for the antenna radiation characteristics in different scenarios.

[0049] Next, in combination with the structures of the first radiating unit A1, the second radiating unit A2 and the feed selection circuit K1, the radiation characteristics of the antenna when the feed selection circuit K1 is connected to different radiating units are described.

[0050] Figure 3 Schematic diagram of the structure of a first radiation unit A1 and a second radiation unit A2 provided in an embodiment of the present application. Figure 3 As shown, the first radiation unit A1 at least includes a first radiation branch W1 connected to the feed selection circuit K1 and a second radiation branch W2 connected to the first radiation branch W1. The second radiation unit A2 at least includes a third radiation branch W3 connected to the feed selection circuit K1 and a fourth radiation branch W4 connected to the third radiation branch W3.

[0051] As an optional implementation, the first radiation unit A1 further includes a first tuner connected between the first radiation branch W1 and the feed selection circuit K1. The second radiation unit A2 further includes a second tuner connected between the third radiation branch W3 and the feed selection circuit K1.

[0052] It should be noted that the first tuner and the second tuner can use a 0 ohm resistor, the first tuner is only used to connect the first feeding branch W1 and the feeding selection circuit K1, and the second tuner is only used to connect the third feeding branch W3 and the feeding selection circuit K2. The second tuner and the third tuner can also be tuned using devices such as capacitors or inductors. Therefore, the first tuner and the second tuner have a tuning state and a non-tuning state, and the first tuner and the second tuner can increase the radiation power of the antenna, thereby optimizing the radiation characteristics of the antenna.

[0053] As an optional implementation, the first radiation branch W1 and the second radiation branch W2 are arranged vertically, and the first radiation branch W1 is connected to an end of the feed selection circuit K1 away from the above-mentioned feeding point P through a first tuner. The third radiation branch W3 and the fourth radiation branch W4 are arranged vertically, and the third radiation branch W3 is connected to an end of the feed selection circuit K1 away from the above-mentioned feeding point P through a second tuner.

[0054] As an optional implementation, the first radiation branch W1 is arranged in parallel with the feed branch selection circuit K1, and the third radiation branch W3 is arranged in parallel with the feed selection circuit K1.

[0055] As an optional implementation, there are gaps between the ends of the first radiation branch W1 , the second radiation branch W2 , the third radiation branch W3 and the fourth radiation branch W4 and the peripheral metal ground, forming gap coupling.

[0056] In practical application, the feed selection circuit K1, the first radiation branch W1 and the second feed branch W2 can be formed as follows: Figure 4 The current loop shown in FIG. 1 , the feed selection circuit K1, the third radiation direct W3 and the fourth radiation branch W4 can form a circuit as shown in FIG. Figure 5 The current loop is shown.

[0057] See also Figure 4 and Figure 5 As shown, the currents of the two current loops flow in different directions. Through the design and selection of the above current loops, the antenna can exhibit different radiation performances, so the miniaturization design of the antenna can be realized in a smaller space. Therefore, the antenna provided in the present application can have multiple radiation modes. The selection process of the antenna radiation mode is introduced in combination with the structure of the feed selection circuit K1.

[0058] See also Figure 6 As shown, the feed selection circuit K1 may be a vertical metal radiator, which includes at least two switches, namely a first switch Q1 and a second switch Q2. Figure 6 As shown, the first ends of the first switch Q1 and the second switch Q2 are connected and connected to the metal ground through the feeding point P, the first end of the first switch Q1 is connected to the first radiation branch W1 through the first tuner, and the other end of the second switch Q2 is connected to the third radiation branch W3 through the second tuner.

[0059] See also Figure 7As shown, there is a first gap L1 between the end of the second radiation branch W2 and one side of the metal ground. When the first switch Q1 is turned on and the second switch Q2 is turned off, the signal output by the signal source passes through the first tuner, the first radiation branch W1 and the second radiation branch W2 in sequence, and is coupled through the gap between the above radiation branches and the metal ground to form a current loop. When the signal passes through the second radiation branch W2, it reverses at the end of the second radiation branch W2, and is coupled through the first gap L1, and flows back to the feeding point P along the path of the antenna clearance area, exciting the first radiation mode of the antenna, that is, the 2.4GHZ antenna working mode.

[0060] It should be noted that when the antenna is in the first radiation mode, the resonant frequency of the antenna is mainly excited by the first slot L1. After the signal passes through the second radiation branch W2, the signal oscillates on the first slot L1 between the second radiation branch W2 and the metal ground. Therefore, the size of the first slot L1 can be tuned by changing the length of the second radiation branch. When the length of the second radiation branch W2 changes, the equivalent length of the current path formed changes, and the coupling strength between the antenna and the metal ground changes. Therefore, the bandwidth and resonance depth of the antenna can be changed by adjusting the size of the first slot L1.

[0061] In actual application, when the first switch Q1 is turned on and the second switch Q2 is turned off, the feed selection circuit K1 is coupled to the first radiation branch W1 through the first tuner, and the second radiation branch W2 is coupled to the metal ground. Although the second switch Q2 is turned off, the right metal ground and the left metal ground coupled to the second radiation branch W2 are the same conductor. Under the action of the magnetic field generated by the current, the right metal ground will form coupled radiation with the feed selection circuit K1, and the radiation area will increase, thereby improving the radiation characteristics of the antenna. Among them, Figure 8 It is a simulation diagram of the antenna loop loss corresponding to when the antenna is in the first radiation mode, wherein the ordinate is the return loss of the antenna in decibels, and the abscissa is the operating frequency of the antenna in GHz. Fig. 9 This is a simulation diagram of the current distribution when the antenna is in the first radiation mode at 2.4 GHZ. Fig.10 This is a simulation diagram of the current distribution when the antenna is in the first radiation mode at 6 GHZ.

[0062] As an optional implementation, inductors, inductors and resistors are added to the first tuner. The connecting devices between the first switch Q1 and the first radiation branch W1 can be selected according to the radiation requirements of the terminal device where the antenna is located and the parameters of the antenna connecting devices, thereby improving the radiation power of the antenna and further improving the radiation performance of the antenna.

[0063] See also Fig.11As shown, there is a second gap L2 between the end of the fourth radiation branch W4 and one side of the metal ground. When the second switch Q2 is turned on and the first switch Q1 is turned off, the signal output by the signal source passes through the second tuner, the third radiation branch W3 and the fourth radiation branch W4 in sequence, and is coupled through the gaps between the above radiation branches and the metal ground to form a current loop. When the signal passes through the fourth radiation branch W4, it reverses at the end of the fourth radiation branch W4, and is coupled through the second gap L2, and flows back to the feeding point P along the path of the antenna clearance area, exciting the second radiation mode of the antenna.

[0064] It should be noted that when the antenna is in the second radiation mode, the resonant frequency of the antenna is mainly excited by the second slot L2. Therefore, the bandwidth and resonance depth of the antenna can be changed by adjusting the size of the second slot L2.

[0065] In actual application, when the second switch Q2 is turned on and the first switch Q2 is turned off, the feed selection circuit K1 is coupled to the third radiation branch W3 through the second tuner, and the fourth radiation branch W4 is coupled to the metal ground. Although the first switch Q1 is turned off, the left metal ground and the right metal ground coupled to the fourth radiation branch W4 are the same conductor. Under the action of the magnetic field generated by the current, the left metal ground will form coupled radiation with the feed selection circuit K1, and the radiation area will increase, thereby improving the radiation characteristics of the antenna. Among them, Fig.12 It is a simulation diagram of the antenna loop loss corresponding to when the antenna is in the second radiation mode, wherein the ordinate is the return loss of the antenna in decibels, and the abscissa is the operating frequency of the antenna in GHz. Fig.13 This is the current distribution simulation diagram when the antenna is in the second radiation mode at 2.4GHZ. Fig.14 This is a simulation diagram of the current distribution when the antenna is in the second radiation mode at 6 GHZ.

[0066] As an optional implementation, inductors, inductors and resistors are added to the second tuner. The connecting devices between the second switch Q1 and the third radiation branch W3 can be selected according to the radiation requirements of the terminal device where the antenna is located and the parameters of the antenna connecting devices, thereby increasing the radiation power of the antenna and further improving the radiation performance of the antenna.

[0067] Continue to see Figure 6As shown, when the first switch Q1 and the second switch Q2 are both turned on, the signal output by the signal source passes through the first tuner, the first radiation branch W1 and the second radiation branch W2 in sequence, and can also pass through the second tuner, the third radiation branch W3 and the fourth radiation branch W4, and couples through the gaps between the above radiation branches and the metal ground to form two current loops. When the signal passes through the second radiation branch W2, it reverses at the end of the second radiation branch W2, and passes through the coupling of the first gap L1, and flows back to the feeding point P along the path of the antenna clearance area. When the signal passes through the fourth radiation branch W4, it reverses at the end of the fourth radiation branch W4, and passes through the coupling of the second gap L2, and flows back to the feeding point P along the path of the antenna clearance area. At this time, the third radiation mode of the antenna is activated.

[0068] In actual application, when the antenna works at 2.4GHZ, the current directions of the signal in the first radiation mode and the second radiation mode are opposite and cancel each other out. Therefore, the signal strength is weakened when the antenna is in the third radiation mode. When the antenna works at 6GHZ, the excitation signal of the antenna is mainly coupled through the first slot L1 and the second slot L2 mentioned above. From the current distribution simulation diagram corresponding to 6GHZ of the above two radiation modes, it can be seen that the paths of the signals in the first radiation mode and the second radiation mode back to the metal ground are different. Therefore, when the antenna works at 6GHZ, the signal is the superposition value of the signals corresponding to the two modes of operation. The radiation efficiency of the antenna is higher, the resonance depth is high, and the current radiation direction is the intersection of the radiation directions corresponding to the first radiation unit and the second radiation unit. The maximum radiation lobe is larger, the radiation pattern is wider, and the effective coverage area of ​​the antenna is larger. The antenna's radiation pattern is better and its omnidirectionality is better. Among them, Fig.15 It is a simulation diagram of the antenna loop loss corresponding to when the antenna is in the third radiation mode, wherein the ordinate is the return loss of the antenna in decibels, and the abscissa is the operating frequency of the antenna in GHz. Fig.16 This is the current distribution simulation diagram of the antenna in the third radiation mode at 6GHZ

[0069] It should be noted that when the antenna is in the third radiation mode, the resonant frequency of the antenna is mainly excited by the first slot L1 and the second slot L2. Therefore, the bandwidth and the resonant depth of the antenna can be changed by adjusting the sizes of the first slot L1 and the second slot L2.

[0070] As an optional implementation, inductors, inductors and resistors are added to the first tuner and the second tuner. According to the radiation requirements of the terminal device where the antenna is located and the parameters of the antenna connection devices, the connection devices between the first switch Q1 and the first radiation branch W1 and the connection devices between the second switch Q2 and the third radiation branch W3 can be selected to increase the radiation power of the antenna and further improve the radiation performance of the antenna.

[0071] From the above introduction to the radiation characteristics of the antenna in the three radiation modes, it can be seen that the switching of the antenna radiation mode is mainly achieved by turning on and off the first switch Q1 and the second switch Q2.

[0072] As an optional implementation, the on and off states of the first switch Q1 and the second switch Q2 are preset according to the working scenario and communication requirements of the terminal device where the antenna is located.

[0073] As an optional embodiment, the antenna is also provided with a first controller connected to the first switch Q1 and the second switch Q2. The first controller can be connected to the second controller in the terminal device where the antenna is located, and control the conduction and disconnection of the first switch and the second switch according to the control signal sent by the second controller.

[0074] In actual applications, antennas are generally placed at the four corners of the terminal device or at the bottom of the terminal device, for example Fig.17 Shown are positions 1 to 5. When the antenna is in different radiation modes, it presents different radiation directions.

[0075] An embodiment of the present application also provides a terminal device, which includes but is not limited to any one of the above-mentioned antennas. The implementation of the terminal device can refer to the relevant introduction of the above-mentioned antennas, and the repeated parts will not be repeated.

[0076] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An antenna, characterized in that: It includes a feed selection circuit, a first radiation unit located on one side of the feed selection circuit, and a second radiation unit located on the other side of the feed selection circuit; The feed selection circuit is connected to the metal ground of the PCB board through the feed point; The first radiation unit includes a first radiation branch connected to the feed selection circuit and a second radiation branch connected to the first radiation branch, and the first radiation branch, the second radiation branch and the feed selection circuit form a current loop; The second radiation unit includes a third radiation branch connected to the feed selection circuit and a fourth radiation branch connected to the third radiation branch, and the third radiation branch, the fourth radiation branch and the feed selection circuit form a current loop.

2. The antenna according to claim 1, characterized in that The first radiation unit further includes a first tuner, the second radiation unit further includes a second tuner, the first radiation branch is connected to the feed selection circuit via the first tuner, and the third radiation branch is connected to the feed selection circuit via the first tuner.

3. The antenna according to claim 2, characterized in that: The first radiation branch and the second radiation branch are arranged vertically, and one end of the first radiation branch is connected to an end of the feed selection circuit away from the feeding point through the first tuner; The third radiation branch and the fourth radiation branch are arranged vertically, and one end of the third radiation branch is connected to an end of the feed selection circuit away from the feeding point through the second tuner.

4. The antenna according to claim 2, characterized in that: There are gaps between the ends of the first radiation branch, the second radiation branch, the third radiation branch and the fourth radiation branch and the peripheral metal ground respectively, forming gap coupling.

5. The antenna according to claim 3 or 4, characterized in that: The first radiation branch is arranged in parallel with the feed selection circuit, and the third radiation branch is arranged in parallel with the feed selection circuit.

6. The antenna according to claim 1, characterized in that The feed selection circuit includes: a first switch and a second switch; The first switch is connected between the first radiation branch and the feeding point; The second switch is connected between the third radiation branch and the feeding point.

7. The antenna according to claim 6, characterized in that It also includes a first controller connected to the first switch and the second switch, the first controller is used to connect to the second controller in the terminal device where the antenna is located, and control the conduction and disconnection of the first switch and the second switch according to a control signal sent by the second controller.

8. The antenna according to claim 1, characterized in that: The feed selection circuit is a metal conductor.

9. The antenna according to claim 4, characterized in that: The distance between the second radiation branch and the metal ground matches the bandwidth requirement of the antenna, and the distance between the fourth radiation branch and the metal ground matches the bandwidth requirement of the antenna.

10. A terminal device, characterized in that: include: An antenna as claimed in any one of claims 1 to 9.

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