Communication terminal

Abstract

The utility model provides a communication terminal, which comprises a frame body, and a first antenna branch knot is formed on the frame body; the two ends of the first antenna branch are provided with a first grounding end and a second grounding end which extend in the direction perpendicular to the first antenna branch, and the first antenna branch comprises a feed end which is located in a middle area between the first grounding end and the second grounding end. The current from the first grounding end to the feed end and the current from the second grounding end to the feed end are reversely offset in the extension direction of the first antenna branch, so that radiation of the first antenna branch to a user holding the communication terminal is reduced, and the SAR value of the communication terminal is reduced.

Description

Technical Field

[0001] The utility model 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 invention, there is provided a communication terminal, comprising:

[0005] a frame, on which a first antenna branch is formed;

[0006] The first antenna branch is provided with a first grounding end and a second grounding end extending perpendicularly to the first antenna branch at both ends. The first antenna branch includes a feeding end located in the middle area between the first grounding end and the second grounding end.

[0007] Optionally, a length of the radiator between the first ground end and the feeding end is a first length, a length of the radiator between the second ground end and the feeding end is a second length, and the first length is equal to the second length.

[0008] Optionally, the frame is a square frame, comprising a top edge, a bottom edge, a first side edge, and a second side edge, wherein the first side edge is connected between one end of the top edge and one end of the bottom edge, and the second side edge is connected between the other end of the top edge and the other end of the bottom edge;

[0009] The feeding end is located at the top edge.

[0010] Optionally, the first grounding end and the second grounding end are both arranged on the top edge.

[0011] Optionally, the first antenna branch is used to cover a satellite communication frequency band.

[0012] Optionally, the first grounding terminal and the second grounding terminal are symmetrically arranged on both sides of the feeding terminal.

[0013] Optionally, the first grounding end is located at the first side, and the second grounding end is located at the second side.

[0014] Optionally, the first antenna branch is used to cover a cellular communication frequency band.

[0015] Optionally, the communication terminal further includes a tuning element, which is connected to the feeding end of the first antenna branch and is used to adjust the resonant frequency of the first antenna branch.

[0016] Optionally, the communication terminal includes a mainboard, a feed source is provided on the mainboard, and the feed source is electrically connected to the feed end of the first antenna branch.

[0017] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0019] Figure 1 A schematic diagram of a communication terminal provided by one embodiment of the present utility model;

[0020] Figure 2 A partial schematic diagram of a communication terminal provided by one embodiment of the present utility model;

[0021] Figure 3 A schematic diagram of current flow on a first antenna branch of a communication terminal provided by one embodiment of the present utility model.

[0022] Wherein: 1, frame; 11, first antenna branch; 111, first ground terminal; 112, second ground terminal; 113, feed terminal; 12, top edge; 13, bottom edge; 14, first side edge; 15, second side edge;

[0023] 100. Motherboard. DETAILED DESCRIPTION

[0024] Various exemplary embodiments of the present invention 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 invention.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] An embodiment of the present application provides a communication terminal, which includes a frame, an antenna branch formed on the frame, and the antenna branch has a feed end, a first ground end, and a second ground end. The feed end is the connection point between the antenna and the mainboard, serving as an interface for the antenna to obtain current and signals from the mainboard, thereby ensuring that the antenna receives and sends radio signals; the ground end formed by the first ground end and the second ground end is a reference ground on the antenna connected to the mainboard, thereby enhancing the antenna's anti-interference capability.

[0031] In which, the feeding end of the antenna branch is located in the middle area between the first ground end and the second ground end. In the extension direction of the antenna branch, the current from the first ground end to the feeding end and the current from the second ground end to the feeding end are reversely offset. In the extension direction perpendicular to the antenna branch, the current from the first ground end to the feeding end and the current from the second ground end to the feeding end are superimposed on each other, thereby reducing the external electromagnetic radiation (SAR value, Specific Absorption Ratio) of the antenna branch.

[0032] In some embodiments, reference Figure 1 and Figure 2 , the present application provides a communication terminal, the communication terminal comprising:

[0033] A frame 1, with a first antenna branch 11 formed on the frame 1;

[0034] The first antenna branch 11 is provided with a first ground terminal 111 and a second ground terminal 112 extending in a direction perpendicular to the first antenna branch 11 at both ends. The first antenna branch 11 includes a feeding terminal 113, which is located in the middle area between the first ground terminal 111 and the second ground terminal 112.

[0035] 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.

[0036] Specifically, antenna branches other than the first 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 .

[0037] In the communication terminal provided in an embodiment of the present application, a first antenna branch 11 is formed on the frame 1, and the first antenna branch 11 extends along the border of the frame 1. A first ground terminal 111 and a second ground terminal 112 are respectively provided at both ends of the first antenna branch 11. The first ground terminal 111 and the second ground terminal 112 can effectively guide the noise signal received by the first antenna branch 11 into the reference ground, thereby reducing the interference of noise on the receiving and transmitting signals on the first antenna branch 11, and improving the signal-to-noise ratio and sensitivity of the first antenna branch 11.

[0038] At the same time, the feeding terminal 113 is located in the middle area between the first ground terminal 111 and the second ground terminal 112. The feeding terminal 113 can be specifically located at the middle point between the first ground terminal 111 and the second ground terminal 112, that is, the distance between the feeding terminal 113 and the first ground terminal 111 is equal to the distance between the feeding terminal 113 and the second ground terminal 112; or the feeding terminal 113 is offset from the middle point between the first ground terminal 111 and the second ground terminal 112, for example, the feeding terminal 113 is located at the middle point between the first ground terminal 111 and the second ground terminal 112, which is biased toward the first ground terminal 111, or the feeding terminal 113 is located at the middle point between the first ground terminal 111 and the second ground terminal 112, which is biased toward the second ground terminal 112. Both of these can achieve reverse cancellation of the current from the first ground terminal 111 to the feeding terminal 113 and the current from the second ground terminal 112 to the feeding terminal 113, thereby reducing the amount of external electromagnetic radiation from the antenna branches.

[0039] In this embodiment, a first radio frequency current is formed from the first ground terminal 111 to the feeding terminal 113, and a second radio frequency current is formed from the second ground terminal 112 to the feeding terminal 113. Since the first radio frequency current and the second radio frequency current are excited by the same feeding terminal 113, the two currents can flow in opposite directions to the feeding terminal 113 along the extension direction of the first antenna branch 11. The extension direction of the first antenna branch 11 can be the direction of the line between the connection point of the first ground terminal 111 on the first antenna branch 11 and the connection point of the second ground terminal 112 on the first antenna branch 11, so that the first radio frequency current from the first ground terminal 111 to the feeding terminal 113 and the second radio frequency current from the second ground terminal 112 to the feeding terminal 113 are offset in opposite directions in the extension direction of the first antenna branch 11; and the first ground terminal 111 and the second ground terminal 112 The ends 112 are both perpendicular to the extension direction of the first antenna branch 11, so that the first RF current from the first grounding end 111 to the feeding end 113 and the second RF current from the second grounding end 112 to the feeding end 113 are superimposed on each other in the extension direction perpendicular to the first antenna branch 11. That is, the spatial electric field generated by the first antenna branch 11 is the electric field formed after the first RF current and the second RF current are partially offset. The direction of the spatial electric field generated by the first antenna branch 11 is perpendicular to the extension direction of the first antenna branch 11. When the communication terminal maintains the same antenna efficiency, the electric field formed by the first antenna branch 11 is weakened after the first RF current and the second RF current are partially offset. That is, the radiation of the first antenna branch 11 to the user holding the communication terminal can be reduced, thereby reducing the SAR value of the communication terminal.

[0040] When testing the SAR value of a communication terminal, human tissue fluid can be attached to the communication terminal to simulate human contact with the communication terminal, and the radiation received by the human tissue fluid can simulate the radiation of the human body when in contact with the communication terminal; and in the communication terminal provided in the embodiment of the present application, the first RF current from the first ground terminal 111 to the feeding terminal 113 and the second RF current from the second ground terminal 112 to the feeding terminal 113 are offset in opposite directions in the extension direction of the first antenna branch 11, so that the electric field formed by the first antenna branch 11 is weakened, which can reduce the direct radiation of the first 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.

[0041] 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.

[0042] See also Figure 2 The first antenna branch 11 extends along the X direction on the frame 1, and the first ground terminal 111 and the second ground terminal 112 extend along the Y direction and are respectively arranged at both ends of the first antenna branch 11. That is, the radiator formed by the first antenna branch 11, the first ground terminal 111 and the second ground terminal 112 is in the XOY plane. A feeding terminal 113 is provided on the first antenna branch 11. The intermediate area between the first ground terminal 111 and the second ground terminal 112 on the first antenna branch 11 is coupled and fed through the feeding terminal 113 to excite the mode of the entire first antenna branch 11, so that the current from the first ground terminal 111 to the feeding terminal 113 and the current from the second ground terminal 112 to the feeding terminal 113 are canceled in opposite directions in the X direction, and the currents on the first antenna branch 11 are superimposed on each other in the Y direction, so that the spatial electric field generated by the first antenna branch 11 is also in the Y direction, thereby reducing the direct radiation of the first antenna branch 11 to the human body, thereby reducing the SAR value.

[0043] In some embodiments, the radiator length between the first ground terminal 111 and the feeding terminal 113 is a first length, the radiator length between the second ground terminal 112 and the feeding terminal 113 is a second length, and the first length and the second length are equal.

[0044] In this embodiment, the first antenna branch 11 can be a straight branch to simplify the structure of the antenna; the first antenna branch 11 can also be a bent branch that bends and extends to increase the path for current to flow within a limited space; the radiator between the first ground end 111 and the feeding end 113 can extend along the width direction of the frame 1, or it can first extend along the length direction of the frame 1 and then bend to the width direction of the frame 1; the radiator between the second ground end 112 and the feeding end 113 can extend along the width direction of the frame 1, or it can first extend along the length direction of the frame 1 and then be bent to the width direction of the frame 1.

[0045] A first length formed between the first ground terminal 111 and the feeding terminal 113 is equal to a second length formed between the second ground terminal 112 and the feeding terminal 113. The current flowing from the first ground terminal 111 to the feeding terminal 113 and the current flowing from the second ground terminal 112 to the feeding terminal 113 are partially offset in reverse, thereby reducing direct radiation from the first antenna branch 11 to the human body while ensuring the structural flexibility of the first antenna branch 11.

[0046] In some embodiments, reference Figure 1 and Figure 2 The frame 1 is a square frame, and the frame 1 includes a top edge 12, a bottom edge 13, a first side edge 14 and a second side edge 15. The first side edge 14 is connected between one end of the top edge 12 and one end of the bottom edge 13, and the second side edge 15 is connected between the other end of the top edge 12 and the other end of the bottom edge 13;

[0047] The feeding end 113 is located at the top edge 12 .

[0048] In this embodiment, the current from the first ground terminal 111 to the feeding terminal 113 will flow along the top edge 12 toward the feeding terminal 113, and the current from the second ground terminal 112 to the feeding terminal 113 will flow in the opposite direction toward the feeding terminal 113 along the top edge 12. The current from the first ground terminal 111 to the feeding terminal 113 and the current from the second ground terminal 112 to the feeding terminal 113 are offset in opposite directions on the top edge 12 to reduce the radiation amount at the top edge 12 in the communication terminal.

[0049] When a communication terminal, such as a mobile phone, is in a call or in use, the top edge 12 is often located close to the user's head. The embodiment of the present application can reduce the radiation exposure of the user's head by lowering the SAR value at the top edge 12, thereby ensuring the user's safety.

[0050] In some embodiments, reference Figure 2 and Figure 3 The first grounding terminal 111 and the second grounding terminal 112 are both disposed on the top edge 12 .

[0051] In this embodiment, the top edge 12 of the frame 1 extends in a straight line, and the first grounding end 111 and the second grounding end 112 are both arranged on the top edge 12, so that the first antenna branch 11 can extend in a straight line along the top edge 12, which simplifies the structure of the first antenna branch 11 while ensuring the stability of the first antenna branch 11.

[0052] In some embodiments, the first antenna branch 11 is used to cover a satellite communication frequency band.

[0053] In this embodiment, the satellite communication frequency band may include the L1 frequency band of the global satellite system (such as GPS, GLONASS, Galileo or Beidou, etc.), and the specific frequency band range of the L1 frequency band is 1.56-1.62GHz. When the first antenna branch 11 covers the satellite communication frequency band, signals from multiple satellites can be received through the communication terminal, thereby improving the positioning accuracy and reliability of the communication terminal.

[0054] In some embodiments, see Figure 2 and Figure 3 The first ground terminal 111 and the second ground terminal 112 are symmetrically arranged on both sides of the feed terminal 113. It is possible that when the first antenna branch 11 extends linearly along the top edge 12, the distance between the first ground terminal 111 and the feed terminal 113 is equal to the distance between the second ground terminal 112 and the feed terminal 113. This allows the current generated from the first ground terminal 111 to the feed terminal 113 and the current generated from the second ground terminal 112 to the feed terminal 113 to completely cancel each other out in the extension direction of the first antenna branch 11, further reducing the SAR value of the communication terminal at the top edge 12.

[0055] In some embodiments, the first ground terminal 111 is located at the first side 14 , and the second ground terminal 112 is located at the second side 15 .

[0056] In this embodiment, the radiator between the first ground end 111 and the feeding end 113 extends along the first side edge 14 and then bends to the top edge 12, that is, the radiator between the first ground end 111 and the feeding end 113 extends along the length direction of the frame 1 and then bends to the width direction of the frame 1; the radiator between the radiator between the second ground end 112 and the feeding end 113, and the radiator between the radiator between the second ground end 112 and the feeding end 113 extend along the second side edge 15 and then bend to the top edge 12, that is, the radiator between the radiator between the second ground end 112 and the feeding end 113 extends along the length direction of the frame 1 and then bends to the width direction of the frame 1, thereby increasing the path for current flow in the first antenna branch 11 within a limited space, thereby improving the ability of the first antenna branch 11 to receive and transmit signals.

[0057] In some embodiments, the first antenna branch 11 is used to cover a cellular communication frequency band.

[0058] In this embodiment, the cellular communication frequency band may include signals within the cell B3-41, and the specific frequency band range of the cell B3-41 may be 1710-2690 MHz. The first antenna branch 11 can ensure signal connection with devices operating in the B3-41 frequency band in the cellular communication network, thereby improving the communication rate and efficiency of the communication terminal.

[0059] In some embodiments, the frame 1 has a length dimension, a width dimension, and a thickness dimension, wherein the length dimension is greater than the width dimension, and the width dimension is greater than the thickness dimension; the feeding end 113 is located on a border extending along the width direction of the frame 1, and the spatial electric field strength of the first antenna branch 11 in the length direction of the frame 1 is Ey;

[0060] When a medium is attached to the frame 1, the relative dielectric constant of the medium is K. In the communication terminal provided by the embodiment of the present application, the first RF current from the first ground terminal 111 to the feeding terminal 113 and the second RF current from the second ground terminal 112 to the feeding terminal 113 are canceled in opposite directions in the extension direction of the first antenna branch 11, so that the direction of the spatial electric field generated by the first antenna branch 11 is perpendicular to the extension direction of the first antenna branch 11, thereby reducing the electric field strength at the medium to Ey / K.

[0061] Specifically, a medium such as human tissue fluid can be attached to the outside of first antenna branch 11 on frame 1 to test the SAR value of the communication terminal by measuring the radiation value at the medium. The direction of the spatial electric field generated by first antenna branch 11 is perpendicular to the extension direction of first antenna branch 11. The electric field strength of free space excited by first antenna branch 11 is Ey. The medium can extend in a direction perpendicular to this spatial electric field. Assuming the relative dielectric constant of the medium is K, the electric field after entering the medium is Ey divided by K, which can reduce the SAR value at the medium.

[0062] In some embodiments, the communication terminal further includes a tuning element, which is connected to the feeding end 113 of the first antenna branch 11 and is used to adjust the resonant frequency of the first antenna branch 11 .

[0063] In this embodiment, the tuning element includes a matching circuit connected to the feeding end 113. By adjusting parameters such as the inductance, capacitance and impedance of the matching circuit, the resonant frequency of the first antenna branch 11 is precisely adjusted so that the resonant frequency of the first antenna branch 11 matches the operating frequency of the communication system. The first antenna branch 11 can then receive and transmit signals more effectively, thereby improving the communication efficiency of the first antenna branch 11, reducing signal loss and interference, and ensuring smooth and stable communication of the communication terminal.

[0064] Specifically, the first antenna branch 11 provided in the embodiment of the present application is located at the top edge 12 of the frame 1, and the first ground terminal 111 and the second ground terminal 112 are symmetrically arranged on both sides of the feeding terminal 113, and the first antenna branch 11 forms a folded loop 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 first 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, and the test results are shown in Table 1.

[0065] Table 1

[0066] Top SAR value Back SAR value Comparative Example 10.99W / kg 10.99W / kg Example 2.12W / kg 2.93W / kg

[0067] 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 current in the first antenna branch 11 provided in the embodiment of the present application is reversely offset in the extension direction of the first antenna branch 11, so that the SAR value at the top and back of the communication terminal is attenuated. The SAR value at the top and back of the communication terminal is 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.

[0068] In some embodiments, see Figure 1 The communication terminal includes a mainboard 100 , on which a feed source is provided, and the feed source is electrically connected to the feed end 113 of the first antenna branch 11 .

[0069] In this embodiment, the feed source is used to feed the first antenna branch 11 . The feed source effectively transmits radio frequency energy from the signal source to the first antenna branch 11 , ensuring that the first antenna branch 11 can emit electromagnetic wave signals of sufficient strength.

[0070] It is understandable that the communication terminal may specifically be a mobile phone, tablet, computer, vehicle or other device.

[0071] Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art will appreciate that the above examples are for illustration only and are not intended to limit the scope of the present invention. Those skilled in the art will appreciate that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A communication terminal, comprising: a frame, on which a first antenna branch is formed; The first antenna branch is provided with a first grounding end and a second grounding end extending perpendicularly to the first antenna branch at both ends. The first antenna branch includes a feeding end located in the middle area between the first grounding end and the second grounding end.

2. The communication terminal according to claim 1, wherein the length of the radiator between the first ground terminal and the feeding terminal is a first length, the length of the radiator between the second ground terminal and the feeding terminal is a second length, and the first length is equal to the second length.

3. The communication terminal according to claim 1, wherein the frame is a square frame, comprising a top side, a bottom side, a first side side, and a second side side, wherein the first side side is connected between one end of the top side and one end of the bottom side, and the second side side is connected between the other end of the top side and the other end of the bottom side; The feeding end is located at the top edge. The communication terminal according to claim 3 , wherein the first grounding terminal and the second grounding terminal are both arranged on the top side. The communication terminal according to claim 4 , wherein the first antenna branch is used to cover a satellite communication frequency band. The communication terminal according to claim 4 , wherein the first ground terminal and the second ground terminal are symmetrically arranged on both sides of the feeding terminal. 7 . The communication terminal according to claim 3 , wherein the first grounding end is located at the first side, and the second grounding end is located at the second side. The communication terminal according to claim 7 , wherein the first antenna branch is used to cover a cellular communication frequency band. 9 . The communication terminal according to claim 1 , further comprising a tuning element connected to a feeding end of the first antenna branch and configured to adjust a resonant frequency of the first antenna branch. 10 . The communication terminal according to claim 1 , comprising a mainboard, a feed source being provided on the mainboard, and the feed source being electrically connected to a feed end of the first antenna branch.

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