Communication terminal

Abstract

The utility model provides a communication terminal which comprises a frame body, and a main antenna branch knot is formed on the frame body. A parasitic antenna branch; the direction of an electric field formed by the parasitic antenna stub is perpendicular to the direction of an electric field formed by the main antenna stub, so that the distribution of the electric field formed by the parasitic antenna stub and the main antenna stub is more uniform, the local concentration effect of signal radiation on a human body or other organisms is reduced, and the effect of reducing the SAR value on the communication terminal is achieved.

Description

Technical Field

[0001] The present application belongs to the field of communication technology, and specifically, relates to a communication terminal. Background Art

[0002] With the widespread use of electronic devices, the Specific Absorption Rate (SAR value) is an indicator for evaluating the impact of radio frequency electromagnetic field radiation on the human body.

[0003] Ensuring compliance with the SAR during operation is a crucial parameter in electronic device antenna design. Therefore, designing antennas to achieve a low SAR during operation has become a technical challenge that needs to be addressed. Utility Model Content

[0004] According to a first aspect of the present application, there is provided a communication terminal, including:

[0005] a frame, on which main antenna branches are formed;

[0006] parasitic antenna branches;

[0007] The direction of the electric field formed by the parasitic antenna branch is perpendicular to the direction of the electric field formed by the main antenna branch.

[0008] Optionally, the main antenna branch is arranged parallel to the first surface, and the direction of the electric field formed by the main antenna branch is perpendicular to the first surface. The parasitic antenna branch is arranged parallel to the second surface, and the direction of the electric field formed by the parasitic antenna branch is perpendicular to the second surface. The first surface and the second surface are perpendicular to each other.

[0009] Optionally, the first surface is the top side of the communication terminal, and the second surface is the plane where the screen of the communication terminal is located.

[0010] Optionally, a first main grounding terminal and a second main grounding terminal are provided at both ends of the main antenna branch, and a feeding terminal is provided in an intermediate area between the first main grounding terminal and the second main grounding terminal.

[0011] Optionally, the first main grounding terminal and the second main grounding terminal are arranged parallel to a third surface, and the third surface is perpendicular to the first surface and the second surface.

[0012] Optionally, the parasitic antenna branch includes a first branch section and a second branch section symmetrically arranged, the symmetry axis between the first branch section and the second branch section is perpendicular to the projection of the main antenna branch on the second surface, and the symmetry axis covers the projection of the feeding end on the second surface.

[0013] Optionally, one end of the first branch section forms a first grounding end, and the other end of the first branch section forms a first open end;

[0014] One end of the second branch section forms a second grounding end, and the other end of the second branch section forms a second open end.

[0015] Optionally, the communication terminal includes a grounding device, the first grounding end and the second grounding end are connected to the grounding device, and the second open end is opposite to the first open end;

[0016] The second branch section and the first branch section are symmetrically arranged at one end of the grounding component close to the main antenna branch section.

[0017] Optionally, the first grounding end and the second grounding end are arranged parallel to a third surface, and the third surface is perpendicular to the first surface and the second surface.

[0018] Optionally, the main antenna branch and the parasitic antenna branch form a circularly polarized antenna.

[0019] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0021] Figure 1 A schematic diagram of a communication terminal provided in accordance with an embodiment of the present application;

[0022] Figure 2 A partial schematic diagram of a communication terminal provided in one embodiment of the present application;

[0023] Figure 3 A schematic diagram of current flow on a main antenna branch and a parasitic antenna branch of a communication terminal provided by one embodiment of the present application;

[0024] Figure 4 A schematic diagram of current distribution on a main antenna branch and a parasitic antenna branch of a communication terminal provided by one embodiment of the present application;

[0025] Figure 5 A schematic diagram of the electric field distribution of a main antenna branch and a parasitic antenna branch of a communication terminal in an XOY plane provided by one embodiment of the present application;

[0026] Figure 6A schematic diagram of the electric field distribution of a main antenna branch and a parasitic antenna branch of a communication terminal on the XOZ plane provided in one embodiment of the present application;

[0027] Figure 7 A schematic diagram of the SAR value distribution of the top surface of a communication terminal provided in one embodiment of the present application;

[0028] Figure 8 A schematic diagram of the SAR value distribution of the top and back of a communication terminal provided in one embodiment of the present application;

[0029] Figure 9 An embodiment of the present application provides a frequency-amplitude curve diagram of a circularly polarized antenna formed by a main antenna branch and a parasitic antenna branch of a communication terminal.

[0030] in:

[0031] 1. Frame; 11. Main antenna branch; 111. First main ground terminal; 112. Second main ground terminal; 113. Feed terminal;

[0032] 2. Parasitic antenna branch; 21. First branch; 211. First ground terminal; 212. First open terminal; 22. Second branch; 221. Second ground terminal; 222. Second open terminal;

[0033] 100. Grounding device. DETAILED DESCRIPTION

[0034] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0035] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be understood as limiting the present application. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0036] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly refer to one or more of the features. Throughout the description of this application, unless otherwise specified, "plurality" means two or more. Furthermore, "and / or" in the specification and claims refers to at least one of the connected entities, and the character " / " generally indicates an "or" relationship between the connected entities.

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0039] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0040] An embodiment of the present application provides a communication terminal, which includes a main antenna branch on a frame and a parasitic antenna branch arranged independently of the frame. The parasitic antenna branch serves as a parasitic branch of the main antenna branch. The direction of the electric field formed by the parasitic antenna branch is perpendicular to the direction of the electric field formed by the main antenna branch. The electric field generated by the main antenna branch can be dispersed in the direction of the electric field formed by the parasitic antenna branch, thereby reducing the radiation amount of the electric field formed by the main antenna branch, thereby reducing the external electromagnetic radiation (SAR value, Specific Absorption Ratio) of the antenna branch on the communication terminal.

[0041] In some embodiments, reference Figure 1 , the present application provides a communication terminal, the communication terminal comprising:

[0042] A frame 1, with a main antenna branch 11 formed on the frame 1;

[0043] Parasitic antenna branch 2;

[0044] The direction of the electric field formed by the parasitic antenna branch 2 is perpendicular to the direction of the electric field formed by the main antenna branch 11 .

[0045] In this embodiment, in order to realize the integration and concealment of the antenna in the communication terminal, the antenna branch can be designed on the frame 1. By forming one or more antenna branches on the frame 1, the communication terminal can support multiple frequency bands, thereby improving the compatibility and flexibility of the communication terminal.

[0046] Specifically, antenna branches other than the main antenna branch 11 may be formed on the frame 1 , for example, a second antenna branch and a third antenna branch may be formed on the frame 1 to increase the frequency band of the radiated signal on the frame 1 .

[0047] In this embodiment, the grounding end of the parasitic antenna branch 2 is used to connect to a grounding device, which can be a component such as a mainboard, a mainboard bracket or a battery cover in the communication terminal; the parasitic antenna branch 2 serves as a parasitic branch of the main antenna branch 11, and the electric field direction generated by the parasitic antenna branch 2 is perpendicular to the main antenna branch 11, so that the electric field distribution formed by the parasitic antenna branch 2 and the main antenna branch 11 can be made more uniform. Uniform electric field distribution means under the same power radiation. It can be understood that the communication terminal has external electromagnetic radiation in all directions in space, and the maximum spatial SAR value is currently used as the SAR of the communication terminal. The present application is conducive to making the spatial electric field distribution of the antenna more uniform, and is conducive to reducing the maximum spatial SAR value, thereby reducing the local concentration effect of signal radiation on the human body or other organisms, and achieving the purpose of reducing the SAR value on the communication terminal.

[0048] At the same time, while reducing the SAR value, the coordinated design of the parasitic antenna branch 2 and the main antenna branch 11 provided in the embodiment of the present application can also ensure that the antenna on the communication terminal maintains good gain performance within the working frequency band.

[0049] The main antenna branch 11 and the parasitic antenna branch 2 provided in the embodiment of the present application can also be used as branches of a circularly polarized antenna.

[0050] In this embodiment, through the cooperation between the parasitic antenna branch 2 and the main antenna branch 11, an electric field component perpendicular to the electric field direction formed on the parasitic antenna branch 2 is introduced, forming two mutually perpendicular electric field components; and the distance between the parasitic antenna branch 2 and the main antenna branch 11 can affect the coupling degree between the parasitic antenna branch 2 and the main antenna branch 11, thereby realizing effective coupling of the circularly polarized antenna structure and ensuring the stability of signal transmission of the communication terminal.

[0051] When testing the SAR value of a communication terminal, a medium such as human tissue fluid can be attached to the communication terminal to simulate human contact with the communication terminal. The radiation received by the human tissue fluid can simulate the radiation of the human body when in contact with the communication terminal. In the communication terminal provided in the embodiment of the present application, the electric field direction generated by the parasitic antenna branch 2 is perpendicular to the main antenna branch 11, which can make the electric field distribution formed by the parasitic antenna branch 2 and the main antenna branch 11 more uniform, and can reduce the direct radiation of the main antenna branch 11 to the human tissue fluid, thereby ensuring the SAR reduction effect of the communication terminal during the SAR value test, so as to meet the index requirements of the communication terminal for human radiation.

[0052] Specifically, the main antenna branch 11 provided in the embodiment of the present application is located at the top edge of the frame 1, and the main antenna branch 11 forms a folded loop antenna. The main antenna branch 11 and the parasitic antenna branch 2 form a circularly polarized antenna; the comparative example is a dipole antenna (Dipole Antenna), and the radiation length of the dipole antenna in the comparative example is equal to the radiation length of the main antenna branch 11 in the embodiment of the present application. The SAR values ​​of the antennas in the embodiment and the comparative example applied to the communication terminal are measured respectively, specifically the SAR values ​​of the top and back of the communication terminal are tested. The test results are shown in Table 1.

[0053] Table 1

[0054] Top SAR value Back SAR value Whether circular polarization Comparative Example 10.99W / kg 10.99W / kg no Example 2.19W / kg 2.34W / kg yes

[0055] As can be seen from Table 1, since the direction of the electric field generated by the dipole antenna in the comparative example is always along the tangential direction of the radiator, the SAR value of the dipole antenna at the top and back of the communication terminal is relatively high; while the electric field direction formed by the parasitic antenna branch 2 provided in the embodiment of the present application is perpendicular to the electric field direction formed by the main antenna branch 11, and the main antenna branch 11 and the parasitic antenna branch 2 form a circularly polarized antenna, so that the SAR value at the top and back of the communication terminal is attenuated, as shown in FIG. Figure 7 and Figure 8 As shown, the maximum SAR value at the top of the communication terminal is 2.19 W / kg, and the maximum SAR value at the back of the communication terminal is 2.34 W / kg. That is, the SAR values ​​at the top and back of the communication terminal provided in the embodiment of the present application are reduced by about 80% compared with the dipole antenna in the comparative example, which can effectively reduce the risk of electromagnetic radiation exposure to the human body.

[0056] In addition, after the main antenna branch 11 and the parasitic antenna branch 2 form a circularly polarized antenna, the axial ratio of the circularly polarized antenna reaches 7.5dB. Figure 9 As shown, the circular polarization characteristics of the circularly polarized antenna are guaranteed.

[0057] In one embodiment, the frame 1 has a length dimension, a width dimension, and a thickness dimension. The length dimension of the frame 1 is greater than the width dimension, and the width dimension of the frame 1 is greater than the thickness dimension. The length dimension of the frame 1 can be the dimension in its length direction, for example, the length dimension of the frame 1 can be Figure 1 The width dimension of the frame 1 may be the dimension in the width direction, for example, the width dimension of the frame 1 may be Figure 1 The dimension in the X direction is perpendicular to the Y direction; the thickness dimension of the frame 1 can be the dimension in the thickness direction, for example, the thickness dimension of the frame 1 can be Figure 1 The dimension in the Z direction perpendicular to the XOY plane.

[0058] See also Figure 2 and Figure 3 The main antenna branch 11 extends along the X direction on the frame 1, and the radiator formed by the main antenna branch 11 is in the XOZ plane; the radiator formed by the parasitic antenna branch 2 is in the XOY plane; at the same time, the direction of the electric field formed by the parasitic antenna branch 2 is perpendicular to the direction of the electric field formed by the main antenna branch 11, for example, the direction of the electric field formed by the main antenna branch 11 is along the Y direction, and the direction of the electric field formed by the parasitic antenna branch 2 is along the Z direction, or the direction of the electric field formed by the main antenna branch 11 is along the Y direction, and the direction of the electric field formed by the parasitic antenna branch 2 is along the X direction.

[0059] When the electric field direction formed by the main antenna branch 11 is along the Y direction and the electric field direction formed by the parasitic antenna branch 2 is along the Z direction, the electric field component in the Z direction can be introduced into the communication terminal through the parasitic antenna branch 2. When the communication terminal maintains the same antenna efficiency, the electric field formed by the main antenna branch 11 is weakened, making the SAR values ​​of each surface on the communication terminal more evenly distributed, thereby reducing the maximum SAR value.

[0060] Moreover, the antenna combination formed by the parasitic antenna branch 2 and the main antenna branch 11 has the characteristics of simple structure and good reliability, which can ensure the stability of signal transmission and reception of the communication terminal.

[0061] In some embodiments, the main antenna branch 11 is arranged parallel to the first surface, and the direction of the electric field formed by the main antenna branch 11 is perpendicular to the first surface. The parasitic antenna branch 2 is arranged parallel to the second surface, and the direction of the electric field formed by the parasitic antenna branch 2 is perpendicular to the second surface. The first surface and the second surface are perpendicular to each other.

[0062] In this embodiment, a first surface and a second surface perpendicular to each other are formed on the communication terminal. For example, the first surface is parallel to the side of the communication terminal, and the second surface is parallel to the front or back of the communication terminal. The front surface can be the side of the communication terminal where the screen is set, and the back surface can be the side of the communication terminal where the back cover is set.

[0063] The main antenna branch 11 is arranged parallel to the first surface, and at the same time, the main antenna branch 11 turns the electric field formed by the main antenna branch 11 to a direction perpendicular to the first surface through the grounding end connected thereto; the parasitic antenna branch 2 is arranged parallel to the second surface, and at the same time, the parasitic antenna branch 2 turns the electric field formed by the parasitic antenna branch 2 to a direction perpendicular to the second surface through the grounding end connected thereto, so as to ensure that the direction of the electric field formed by the parasitic antenna branch 2 is perpendicular to the direction of the electric field formed by the main antenna branch 11, thereby improving the balance of the external electromagnetic radiation of the antenna branches on the communication terminal.

[0064] The frame 1 has a length dimension, a width dimension and a thickness dimension. The length dimension of the frame 1 can be Figure 1 The size in the Y direction, the width of the frame 1 can be Figure 1 The size in the X direction, the thickness of the frame 1 can be Figure 1 The dimension in the Z direction perpendicular to the XOY plane.

[0065] In a specific embodiment, the first surface may be perpendicular to Figure 1 The first surface can be the XOZ surface; the second surface can be perpendicular to Figure 1 The second surface can be the XOY surface; the third surface can be perpendicular to Figure 1 YOZ plane in the middle X direction; part of the main antenna branch 11 is in the XOZ plane, and part of the main antenna branch 11 is in the YOZ plane; Figure 5 A schematic diagram of the electric field distribution of a main antenna branch and a parasitic antenna branch of a communication terminal in an embodiment of the present application on the XOY plane is provided. The electric field formed by the main antenna branch 11 is in the Y direction. Figure 6 A schematic diagram of the electric field distribution of the main antenna branch and parasitic antenna branch of a communication terminal in the XOZ plane is given according to an embodiment of the present application. The electric field direction formed by the parasitic antenna branch 2 is along the Z direction, making the SAR value distribution on each surface of the communication terminal more uniform.

[0066] In another specific embodiment, the first surface may be perpendicular to Figure 1 The first surface can be the YOZ surface; the second surface can be perpendicular to Figure 1 The second surface can be the XOY surface; the third surface can be perpendicular to Figure 1 XOZ plane in the middle Y direction; some branches of the main antenna branch 11 are in the XOZ plane, and some branches of the main antenna branch 11 are in the YOZ plane. The direction of the electric field formed by the main antenna branch 11 is along the X direction, and the direction of the electric field formed by the parasitic antenna branch 2 is along the Z direction, which can also make the SAR value distribution of each surface on the communication terminal more uniform.

[0067] In one embodiment, the first surface is the top side of the communication terminal, and the second surface is the plane where the screen of the communication terminal is located.

[0068] In this embodiment, the main antenna branch 11 is arranged parallel to the top side of the communication terminal. For example, the main antenna branch 11 is arranged along the top edge of the frame 1. The electric field component perpendicular to the plane direction of the screen of the communication terminal is introduced into the communication terminal through the parasitic antenna branch 2, and the electric field formed by the main antenna branch 11 at the top edge is weakened. Taking a mobile phone as an example, during a call or use of the communication terminal, the top edge is often close to the user's head. The embodiment of the present application can reduce the radiation exposure of the user's head by reducing the SAR value of the top edge, thereby ensuring the user's safety.

[0069] In one embodiment, see Figure 1 and Figure 2 A first main ground terminal 111 and a second main ground terminal 112 are provided at both ends of the main antenna branch 11 , and a feeding terminal 113 is provided in the middle area between the first main ground terminal 111 and the second main ground terminal 112 .

[0070] In the communication terminal provided in an embodiment of the present application, a main antenna branch 11 is formed on the frame 1, and the main antenna branch 11 extends along the frame of the frame 1, and a first main ground terminal 111 and a second main ground terminal 112 are respectively provided at both ends of the main antenna branch 11. The first main ground terminal 111 and the second main ground terminal 112 can effectively guide the noise signal received by the main antenna branch 11 into the reference ground, thereby reducing the interference of noise on the receiving and transmitting signals on the main antenna branch 11, and improving the signal-to-noise ratio and sensitivity of the main antenna branch 11.

[0071] At the same time, the feeding terminal 113 is located in the middle area between the first main grounding terminal 111 and the second main grounding terminal 112. The feeding terminal 113 can be specifically located at the middle point between the first main grounding terminal 111 and the second main grounding terminal 112, that is, the distance between the feeding terminal 113 and the first main grounding terminal 111 is equal to the distance between the feeding terminal 113 and the second main grounding terminal 112; or the feeding terminal 113 is offset from the middle point between the first main grounding terminal 111 and the second main grounding terminal 112, for example, the feeding terminal 113 is located at the middle point between the first main grounding terminal 111 and the second main grounding terminal 112, deviated toward the first main grounding terminal 111, or the feeding terminal 113 is located at the middle point between the first main grounding terminal 111 and the second main grounding terminal 112, deviated toward the second main grounding terminal 112; Figure 4A schematic diagram of the current distribution on the main antenna branch and parasitic antenna branch of a communication terminal provided by one embodiment of the present application is provided. As can be seen from the figure, when the feeding terminal 113 is located in the middle area between the first main grounding terminal 111 and the second main grounding terminal 112, the current from the first main grounding terminal 111 to the feeding terminal 113 and the current from the second main grounding terminal 112 to the feeding terminal 113 can be reversely offset, thereby reducing the external electromagnetic radiation of the antenna branch, such as Figure 4 shown.

[0072] In this embodiment, a first radio frequency current is generated from the first main ground terminal 111 to the feed terminal 113, and a second radio frequency current is generated from the second main ground terminal 112 to the feed terminal 113. Since the first radio frequency current and the second radio frequency current both flow in the opposite direction along the extension direction of the main antenna branch 11 to the feed terminal 113, the first radio frequency current from the first main ground terminal 111 to the feed terminal 113 and the second radio frequency current from the second main ground terminal 112 to the feed terminal 113 are offset in the opposite direction along the extension direction of the main antenna branch 11. The first main ground terminal 111 and the second main ground terminal 112 are both perpendicular to the main antenna. The extension of the wire branch 11 causes the first RF current from the first main grounding terminal 111 to the feeding terminal 113 and the second RF current from the second main grounding terminal 112 to the feeding terminal 113 to superimpose on each other in a direction perpendicular to the extension direction of the main antenna branch 11. That is, the electric field generated by the main antenna branch 11 is an electric field formed after the first RF current and the second RF current partially offset each other. The direction of the spatial electric field generated by the main antenna branch 11 is perpendicular to the extension direction of the main antenna branch 11, so as to reduce the radiation of the main antenna branch 11 to the user holding the communication terminal, thereby reducing the SAR value of the communication terminal.

[0073] In a specific embodiment, see Figure 2 The main antenna branch 11 extends along the X direction on the frame 1, and the first main ground terminal 111 and the second main ground terminal 112 extend along the Y direction and are respectively arranged at both ends of the main antenna branch 11. That is, the radiator formed by the main antenna branch 11, the first main ground terminal 111 and the second main ground terminal 112 is in the XOY plane. A feeding terminal 113 is provided on the main antenna branch 11. The intermediate area between the first main ground terminal 111 and the second main ground terminal 112 on the main antenna branch 11 is coupled and fed through the feeding terminal 113 to excite the mode of the entire main antenna branch 11, so that the current from the first main ground terminal 111 to the feeding terminal 113 and the current from the second main ground terminal 112 to the feeding terminal 113 are oppositely offset in the X direction, while the currents on the main antenna branch 11 are superimposed on each other in the Y direction, so that the spatial electric field generated by the main antenna branch 11 is also in the Y direction, thereby reducing the direct radiation of the main antenna branch 11 to the human body, thereby reducing the SAR value.

[0074] In one embodiment, see Figure 1 and Figure 2 The first main grounding terminal 111 and the second main grounding terminal 112 are arranged parallel to the third surface, and the third surface is perpendicular to the first surface and the second surface.

[0075] In this embodiment, the first main grounding terminal 111 and the second main grounding terminal 112 direct the direction of the electric field generated by the main antenna branch 11 toward the third surface, while the direction of the electric field formed by the parasitic antenna branch 2 is perpendicular to the second surface. In order to facilitate the perpendicularity of the electric field direction formed by the main antenna branch 11 and the electric field direction formed by the parasitic antenna branch 2, the electric field direction of the main antenna branch 11 in the third surface can be extended along the intersection of the second surface and the third surface to achieve balanced antenna radiation on the communication terminal.

[0076] In a specific embodiment, see Figure 1 and Figure 3 The frame 1 has a length dimension, a width dimension and a thickness dimension. The length dimension of the frame 1 can be Figure 1 The size in the Y direction, the width of the frame 1 can be Figure 1 The size in the X direction, the thickness of the frame 1 can be Figure 1 The dimension in the Z direction perpendicular to the XOY plane, the first plane can be perpendicular to Figure 1 The first surface can be the XOZ surface; the second surface can be perpendicular to Figure 1 The second surface can be the XOY surface; the third surface can be perpendicular to Figure 1 In the YOZ plane in the X direction, the electric field direction formed by the main antenna branch 11 is along the Y direction, and the electric field direction formed by the parasitic antenna branch 2 is along the Z direction, so that the SAR value distribution of each surface on the communication terminal is more uniform.

[0077] In one embodiment, see Figure 1 and Figure 2 The parasitic antenna branch 2 includes a first branch 21 and a second branch 22 symmetrically arranged, the symmetry axis between the first branch 21 and the second branch 22 is perpendicular to the projection of the main antenna branch 11 on the second surface, and the symmetry axis covers the projection of the feeding end 113 on the second surface.

[0078] In this embodiment, the first branch node 21 and the second branch node 22 can both be arranged parallel to the second surface, and the symmetry axis between the first branch node 21 and the second branch node 22 is perpendicular to the projection of the main antenna branch node 11 on the second surface, which can facilitate the same-direction arrangement of the main antenna branch node 11 and the first branch node 21 and the second branch node 22, thereby improving the compactness of the communication terminal; and the symmetry axis between the first branch node 21 and the second branch node 22 covers the projection of the feeding end 113 on the second surface, so that the branch from the first main grounding end 111 to the feeding end 113 corresponds to the first branch node 21, and the branch from the second main grounding end 112 to the feeding end 113 corresponds to the second branch node 22, thereby improving the structural symmetry of the main antenna branch node 11.

[0079] In one embodiment, see Figure 2 and Figure 3 One end of the first branch section 21 forms a first grounding end 211 , and the other end of the first branch section 21 forms a first opening end 212 ;

[0080] One end of the second branch section 22 forms a second grounding end 221 , and the other end of the second branch section forms a second opening end 222 .

[0081] In this embodiment, the first grounding end 211 of the first branch node 21 is used to connect to the grounding device to enhance the anti-interference capability of the first branch node 21; the first open end 212 of the first branch node 21 is used to radiate the signal to ensure the signal transmission performance of the first branch node 21; the second grounding end 221 of the second branch node 22 is used to connect to the grounding device to enhance the anti-interference capability of the second branch node 22; the second open end 222 of the second branch node 22 is used to radiate the signal to ensure the signal transmission performance of the second branch node 22.

[0082] In one embodiment, see Figure 1 and Figure 2 , the communication terminal includes a grounding device 100, a first grounding terminal 211 and a second grounding terminal 221 are connected to the grounding device 100, and the second open end 222 is opposite to the first open end 212;

[0083] The second branch section 22 and the first branch section 21 are symmetrically arranged at one end of the grounding component 100 close to the main antenna branch section 11 .

[0084] In this embodiment, the grounding device 100 can be a component such as a mainboard, a mainboard bracket or a battery cover. The first grounding terminal 211 and the second grounding terminal 221 on the parasitic antenna branch 2 are connected to the grounding device 100, which can enhance the anti-interference ability of the parasitic antenna branch 2.

[0085] Moreover, the first grounding end 211 and the second grounding end 221 guide the current of the second branch node 22 and the first branch node 21 to the second open end 222 and the first open end 212 respectively, and guide the electric field direction of the second branch node 22 and the first branch node 21 to a direction perpendicular to the electric field direction formed by the main antenna branch node 11. When the communication terminal maintains the same antenna efficiency, the electric field formed by the main antenna branch node 11 is weakened, that is, the electric field within the antenna clearance of the main antenna branch node 11 is dispersed to two mutually perpendicular directions, so that the signal radiation distribution on each surface of the communication terminal is more uniform, avoiding the problem of excessive radiation on individual surfaces of the communication terminal.

[0086] At the same time, the second branch node 22 and the first branch node 21 are configured to be symmetrically arranged at the same end of the grounding device 100. Specifically, the second branch node 22 and the first branch node 21 are symmetrically arranged at one end of the grounding device 100 close to the main antenna branch node 11, which can enhance the coupling efficiency between the parasitic antenna branch node 2 and the main antenna branch node 11.

[0087] In one embodiment, see Figure 1 and Figure 2 The first grounding terminal 211 and the second grounding terminal 221 are arranged parallel to the third surface, and the third surface is perpendicular to the first surface and the second surface.

[0088] The first grounding terminal 211 and the second grounding terminal 221 direct the direction of the electric field generated by the parasitic antenna branch 2 toward the third surface, while the direction of the electric field formed by the main antenna branch 11 is perpendicular to the first surface. In order to facilitate the perpendicularity of the electric field direction formed by the main antenna branch 11 and the electric field direction formed by the parasitic antenna branch 2, the electric field direction of the parasitic antenna branch 2 in the third surface can be extended along the intersection of the first surface and the third surface to achieve balanced antenna radiation on the communication terminal.

[0089] In some embodiments, the parasitic antenna branch 2 is formed by LDS, PDS or FPC process.

[0090] In this embodiment, the parasitic antenna branch 2 can be manufactured on the mainboard, mainboard bracket or battery cover of the communication terminal through LDS (Laser Direct Structuring), PDS (Printing Direct Structure) or FPC (Flexible Printed Circuit) process to simplify the molding process of the parasitic antenna branch 2 and ensure the structural stability of the parasitic antenna branch 2.

[0091] It is understandable that the electronic device may specifically be a mobile phone, tablet, computer and other devices.

[0092] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A communication terminal, comprising: a frame, on which main antenna branches are formed; parasitic antenna branches; The direction of the electric field formed by the parasitic antenna branch is perpendicular to the direction of the electric field formed by the main antenna branch; At least part of the main antenna branch is arranged parallel to the first surface, and the direction of the electric field formed by the main antenna branch is perpendicular to the first surface. The parasitic antenna branch is arranged parallel to the second surface, and the direction of the electric field formed by the parasitic antenna branch is perpendicular to the second surface. The first surface and the second surface are perpendicular to each other. 2 . The communication terminal according to claim 1 , wherein the first surface is a top side surface of the communication terminal, and the second surface is a plane where a screen of the communication terminal is located.

3. The communication terminal according to claim 1, wherein a first main grounding terminal and a second main grounding terminal are provided at both ends of the main antenna branch, and a feeding terminal is provided in the middle area between the first main grounding terminal and the second main grounding terminal. 4 . The communication terminal according to claim 3 , wherein the first main grounding terminal and the second main grounding terminal are arranged parallel to a third surface, and the third surface is perpendicular to the first surface and the second surface.

5. The communication terminal according to claim 3, the parasitic antenna branch includes a first branch section and a second branch section symmetrically arranged, the symmetry axis between the first branch section and the second branch section is perpendicular to the projection of the main antenna branch on the second surface, and the symmetry axis covers the projection of the feeding end on the second surface.

6. The communication terminal according to claim 5, wherein one end of the first branch section forms a first grounding end, and the other end of the first branch section forms a first open end; One end of the second branch section forms a second grounding end, and the other end of the second branch section forms a second open end.

7. The communication terminal according to claim 6, comprising a grounding device, wherein the first grounding terminal and the second grounding terminal are connected to the grounding device, and the second open end is opposite to the first open end; The second branch section and the first branch section are symmetrically arranged at one end of the grounding component close to the main antenna branch section. 8 . The communication terminal according to claim 6 , wherein the first ground terminal and the second ground terminal are arranged parallel to a third surface, and the third surface is perpendicular to the first surface and the second surface. 9 . The communication terminal according to claim 1 , wherein the main antenna branch and the parasitic antenna branch form a circularly polarized antenna.

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