A wireless terminal

Abstract

This application provides a wireless terminal, relating to the field of antenna technology. The wireless terminal includes a housing, an antenna, a circuit board, and a loss reduction structure. The housing has a first side plate. Both the antenna and the circuit board are disposed inside the housing. The circuit board is close to and opposite to the first side plate, and serves as the grounding terminal of the antenna. The loss reduction structure is made of metal and includes a connecting stub, a first stub, and a second stub. The connecting stub is electrically connected to the circuit board. The first stub and the second stub are located on both sides of the connecting stub and are both connected to the connecting stub. The first stub and the second stub are close to the first side plate and are both arranged in a direction parallel to the first side plate.

Description

[0001] This application claims priority to Chinese Patent Application No. 202010747370.7, filed with the State Intellectual Property Office of China on July 29, 2020, entitled "A Wireless Terminal", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of antenna technology, and more particularly to a wireless terminal. Background Technology

[0003] like Figure 1 As shown, the wireless terminal housing 01 contains a circuit board 03 and one or more antennas 02. The circuit board 03 generally integrates chips, sensors, transceiver modules (not shown in the figure), and other functional modules. The antennas 02 are connected to the transceiver modules on the circuit board 03 through a power supply structure.

[0004] Typically, circuit board 03 is made of a large area of ​​metal material, so it is usually considered to be the ground terminal (GND) of the antenna. When antenna 02 is transmitting or receiving signals, high-frequency current will flow through circuit board 03.

[0005] When using this wireless terminal, refer to Figure 1 The side of the outer casing 01 opposite to the circuit board 03 will be close to or in close contact with the skin 04. When a high-frequency current passes through the circuit board 03 ( Figure 1 Line L1 represents the high-frequency current on circuit board 03, which will induce a current on the surface of skin 04. Figure 1 Line L2 represents the induced current on the skin (04). Since the conductivity of the skin is very low, part of the electromagnetic waves radiated by the antenna will be absorbed by the skin. This leads to two technical problems: first, it will cause a decrease in the antenna's total radiation power (TRP); second, it will cause a larger specific absorption rate (SAR) in the human body, which will have many adverse effects on human health and thus affect the user experience. Summary of the Invention

[0006] The embodiments of this application provide a wireless terminal, the main purpose of which is to provide a wireless terminal that can reduce the absorption of electromagnetic waves radiated by the antenna by the skin, thereby improving the antenna radiation efficiency and reducing SAR.

[0007] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0008] This application provides a wireless terminal, including a housing, an antenna, a circuit board, and a loss reduction structure. The housing has a first side plate. The antenna and the circuit board are both disposed inside the housing. The circuit board is close to the first side plate and is arranged opposite to the first side plate. The circuit board is the grounding terminal of the antenna. The loss reduction structure is made of metal material and includes: a connecting stub, a first stub, and a second stub. The connecting stub is electrically connected to the circuit board. The first stub and the second stub are located on both sides of the connecting stub and are both connected to the connecting stub. The first stub and the second stub are close to the first side plate and are arranged in a direction parallel to the first side plate.

[0009] The wireless terminal provided in this application includes a loss reduction structure made of metallic material. When the antenna transmits and receives signals, a high-frequency current flows through the circuit board serving as the antenna's ground terminal, flowing to the first and second stubs. Since the first and second stubs are located on opposite sides of the connecting stub, the current direction on the first stub is opposite to that on the second stub. When the first side panel of the outer casing is close to or in close contact with the human body, because the current direction on the first stub is opposite to that on the second stub, the induced current on the human body surface will also be in the opposite direction, thus the currents in the area of ​​the body surface near the connecting stub will essentially cancel each other out. Therefore, when the first side panel of the wireless terminal of this application is close to or in close contact with the body surface, compared to the prior art, the induced current on the body surface will be significantly reduced, thereby reducing the absorption of electromagnetic waves from the antenna by the body surface, achieving loss reduction, and ultimately improving the antenna's radiation efficiency. Simultaneously, it can also reduce the specific absorption rate of the human body, thereby reducing the impact on human health and improving the user experience of the wireless terminal.

[0010] In one possible implementation, the first and second branches are arranged symmetrically with respect to the connecting branch. When the first and second branches are arranged symmetrically, their lengths are comparable. This results in comparable current magnitudes on the first and second branches. Consequently, the induced current at the corresponding first branch on the surface is comparable to the induced current at the corresponding second branch on the surface. Furthermore, the currents in the region of the surface near the connecting branch will cancel each other out, nearly completely canceling each other out, further reducing the absorption of electromagnetic waves by the antenna and improving its radiation efficiency.

[0011] In one possible implementation, the sum of the lengths of the first and second stubs is equal to half the propagation wavelength of the electromagnetic waves in the antenna's frequency band. When the sum of the lengths of the first and second stubs is equal to half the propagation wavelength of the electromagnetic waves in the antenna's frequency band, two things are achieved: first, the currents on the surface near the connecting stubs will cancel each other out, and nearly completely cancel each other out, further improving the antenna's radiation efficiency; second, the antenna's radiation effect can be improved.

[0012] In one possible implementation, the first and second stubs are located on the wall of the first side panel facing away from the circuit board. When the first and second stubs are located on the wall of the first side panel facing away from the circuit board, that is, when the first side panel of the housing is close to or in close contact with the human body, the distance between the first and second stubs and the body surface is very close. This further reduces the absorption of electromagnetic waves from the antenna by the body surface, thereby improving the loss reduction effect of the loss reduction structure and further improving the radiation efficiency of the antenna.

[0013] In one possible implementation, a metal through-hole is provided on the first side plate, extending through both the first and second wall surfaces, forming a connecting branch. By using metal through-holes to form the connecting branch, the overall loss reduction structure can be simplified.

[0014] In one possible implementation, a groove is formed on the wall of the first side plate facing the circuit board, and the first and second branches are located within the groove. That is, placing the first and second branches on the inner surface of the casing improves the aesthetics of the wireless terminal. Furthermore, by creating a groove on the wall of the first side plate facing the circuit board to house the first and second branches, compared to directly placing them on the inner wall of the first side plate, the distance between the first and second branches and the surface is reduced. This further reduces the absorption of electromagnetic waves from the antenna by the surface, further improving the antenna's radiation efficiency, while also ensuring the aesthetics of the wireless terminal.

[0015] In possible implementations, there are multiple first and second branches, with a one-to-one correspondence between the multiple first branches and multiple second branches. Each first branch and its corresponding second branch are located on opposite sides of the connecting branch. When the wireless terminal is in use, the area of ​​contact between the first side plate and the body surface may be relatively large. By setting multiple first and multiple second branches, the phenomenon of some parts of the body surface having virtually no induced current while others do can be avoided. Therefore, setting multiple first and multiple second branches will further improve the radiation efficiency of the wireless terminal's antenna.

[0016] In one possible implementation, multiple first branches and multiple second branches are connected together to form a rotating structure centered on the connecting branches. From a manufacturing perspective, connecting multiple first branches and multiple second branches together reduces the difficulty of manufacturing compared to separating multiple first branches and multiple second branches; from a loss reduction perspective, it further increases the area in contact with the skin, thereby further improving the radiation efficiency of the wireless terminal's antenna.

[0017] In one possible implementation, the connecting stub is coupled to the circuit board. This electrical connection structure is simple and easy to implement.

[0018] In one possible implementation, the connecting stub is connected to the circuit board via a capacitor. This electrical connection structure is simple and easy to implement.

[0019] In one possible implementation, the wireless terminal is a wearable device, which includes a watch face and a watch strap. The first and second branches are disposed on the bottom cover of the watch face. Since wearable devices are often worn on the wrist, the human body has a relatively large impact on the radiation efficiency of the antenna. However, this application, by setting a loss reduction structure, will greatly reduce the induced current on the body surface, thereby improving the radiation efficiency of the antenna, reducing the specific absorption rate of the human body, and improving the user experience.

[0020] In one possible implementation, the bottom cover is made of metal and has a rotating structure. The bottom cover forms a first and a second branch, with the connection point between the branch and the bottom cover located at the center of the bottom cover. Directly utilizing the metal bottom cover of the dial as a loss reduction structure, compared to setting up a separate loss reduction structure, not only improves the antenna's radiation efficiency but also simplifies the overall structure of the wearable device.

[0021] In possible implementations, the wireless terminal can be a mobile phone, tablet computer, augmented reality device, or virtual reality device. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a wireless terminal in the prior art;

[0023] Figure 2 This is a schematic diagram of the structure of a wireless terminal provided in an embodiment of this application;

[0024] Figure 3 A schematic diagram illustrating the flow of high-frequency current on the circuit board and the flow of induced current on the skin when the wireless terminal provided in this application is close to the skin.

[0025] Figure 4 A schematic diagram illustrating the principle of induced current formation on the skin surface when the wireless terminal provided in this application comes into close contact with the skin;

[0026] Figure 5a A simulation diagram of the wireless terminal provided in the embodiments of this application;

[0027] Figure 5b A simulation diagram of the wireless terminal provided in the embodiments of this application;

[0028] Figure 6 A graph showing the antenna radiation efficiency and system efficiency of the wireless terminal provided in the embodiments of this application;

[0029] Figure 7 This is a partial structural diagram of a wireless terminal provided in an embodiment of this application;

[0030] Figure 8 This is a schematic diagram of the structure of a wireless terminal provided in an embodiment of this application;

[0031] Figure 9 This is a schematic diagram of the loss reduction structure provided in the embodiments of this application;

[0032] Figure 10 This is a schematic diagram of the loss reduction structure provided in the embodiments of this application;

[0033] Figure 11 This is a schematic diagram of the loss reduction structure provided in the embodiments of this application;

[0034] Figure 12 This is a schematic diagram of the structure of a wearable device provided in the embodiments of this application;

[0035] Figure 13 This is a schematic diagram of the structure of the watch face of the wearable device provided in the embodiments of this application;

[0036] Figure 14 This is a schematic diagram of a mobile phone as the wireless terminal provided in an embodiment of this application.

[0037] Figure label:

[0038] 01-Outer shell; 02-Antenna; 03-Circuit board; 04-Skin; 1-Outer shell; 101-First side plate; A1-First wall surface; A2-Second wall surface; 2-Antenna; 3-Circuit board; 4-Loss reduction structure; 41-Connecting stub; 42-First stub; 43-Second stub; 5-Feeding structure; 6-Skin; 7-Metal through hole; 8-Wearable device; 81-Dial; 82-Watch strap; 9-Mobile phone; 10-Groove; 11-Analog block. Detailed Implementation

[0039] As wireless terminals become more diverse in function, the number of internal antennas is increasing. In actual use, there are scenarios where wireless terminals are close to or even pressed against the human body. When the antennas inside the wireless terminal are close to the human body, the human body absorbs some of the electromagnetic waves radiated by the antennas, which reduces the antenna's radiation efficiency and affects the user experience.

[0040] It should be noted that the wireless terminal in this application can be a mobile phone, tablet computer, wearable device, augmented reality (AR) device, virtual reality (VR) device, etc. This application does not limit the specific type of wireless terminal.

[0041] In order to reduce the absorption of electromagnetic waves radiated by the human body, this application provides a wireless terminal that can reduce the absorption of electromagnetic waves radiated by the human body, improve the radiation efficiency of the antenna, and at the same time reduce the specific absorption rate of the human body, so as to reduce the impact on the human body.

[0042] Reference Figure 2 The wireless terminal includes a housing 1, an antenna 2 located inside the housing 1, a circuit board 3, a transceiver module, and a power supply structure 5.

[0043] Typically, the transceiver module is mounted on circuit board 3, and antenna 2 is electrically connected to the transceiver module via feed structure 5. In addition, circuit board 3 also houses other functional modules of the wireless terminal.

[0044] It should be noted that this application does not limit the placement of antenna 2, including, for example... Figure 2 The setting location is shown, but not limited to, this setting location.

[0045] Since most of the circuit board 3 is made of metal, it is used as the grounding terminal for antenna 2 to simplify the internal structure of the wireless terminal. This means that when antenna 2 transmits or receives signals, a high-frequency current will flow through circuit board 3.

[0046] Reference Figure 2 The outer casing 1 has a first side plate 101, and the circuit board 3 is arranged close to the first side plate 101 and opposite to the first side plate 101.

[0047] The circuit board 3 is opposite to the first side plate 101. The circuit board 3 and the first side plate 101 can be parallel or nearly parallel.

[0048] Reference Figure 2 The wireless terminal also includes a loss reduction structure 4, which is made of metal material and includes a connecting branch 41, a first branch 42, and a second branch 43.

[0049] like Figure 2 As shown, the connecting branch 41 is connected to the circuit board 3. The first branch 42 and the second branch 43 are located on both sides of the connecting branch 41 and are both connected to the connecting branch 41. The first branch 42 and the second branch 43 are close to the first side plate 101. The first branch 42 and the second branch 43 are both arranged in a direction parallel to the first side plate 101.

[0050] Since the connecting branch 41 is connected to the circuit board 3, when a high-frequency current passes through the circuit board 3, the high-frequency current on the circuit board 3 will flow into the first branch 42 and the second branch 43 through the connecting branch 41.

[0051] When using this wireless terminal, refer to Figure 3 The first side panel 101 will be close to or in close contact with the skin 6. For example, when the wireless terminal is a wearable device (watch, bracelet), the first side panel 101 is the bottom cover of the watch face, and the bottom cover is close to the skin. As another example, when the wireless terminal is a mobile phone, the first side panel 101 is the back cover of the mobile phone, and when the mobile phone is placed in a pocket, the back cover will be close to the skin.

[0052] The loss reduction principle of this loss reduction structure is shown in Figure 3. The dashed line with arrows on the circuit board 3 represents the high-frequency current on the circuit board 3, the dashed line with arrows on the first branch 42 represents the current on the first branch 42, the dashed line with arrows on the second branch 43 represents the current on the second branch 43, and the dashed line with arrows on the body 6 represents the induced current on the body 6.

[0053] Because the first branch 42 and the second branch 43 are located on both sides of the connecting branch 41, from Figure 3 It can be seen that the current direction on the first branch 42 is opposite to the current direction on the second branch 43. In this way, the induced current on the surface of the skin 6 flows towards the area corresponding to the connecting branch 41. As a result, the induced currents in the area of ​​the skin 6 corresponding to the connecting branch 41 will cancel each other out, thereby reducing the induced current on the skin 6.

[0054] Because the induced current on the skin 6 cancels each other out in the area near the connecting branch 41, the induced current on the skin will be very weak. If the loss reduction structure is not set, the corresponding connecting branch of the skin 6 is a strong current area. However, after adding the loss reduction structure, the current in this area becomes very weak, which significantly reduces the absorption of electromagnetic waves by the human body and achieves the loss reduction effect. At the same time, it can also reduce SAR and avoid many adverse effects on human health.

[0055] Figure 4 This illustrates the principle of how the induced current on the skin 6 flows towards the location near the connecting branch 41. When the current on the connecting branch 41 flows towards the first branch 42, positive charges accumulate at the location of the connecting branch 41, and negative charges accumulate at the end of the first branch 42 away from the connecting branch 41 (i.e., the end of the first branch). Therefore, positive charges accumulate at the corresponding end of the first branch 42 on the skin 6, while negative charges accumulate at the corresponding location of the connecting branch 41 on the skin 6.

[0056] Similarly, when the current on the connecting branch 41 flows to the second branch 43, positive charges accumulate at the location of the connecting branch 41, and negative charges accumulate at the end of the second branch 43 away from the connecting branch 41 (i.e., the end of the second branch). Therefore, positive charges accumulate at the corresponding end of the second branch 43 on the skin 6, while negative charges accumulate at the corresponding location of the connecting branch 41 on the skin 6. In this way, there will be an induced current in the skin with opposite currents. Consequently, near the location of the connecting branch, the induced currents with opposite currents will cancel each other out, reducing the induced current on the skin.

[0057] The following simulation experiment analyzes the damage reduction effect of the damage reduction structure provided in the embodiments of this application.

[0058] A simulation block with a length of 80mm, a width of 80mm, and a height of 50mm is used. The parameters of this simulation block are the same as those of human tissue, and this simulation block is used to simulate human skin.

[0059] Figure 5a This is a simulation diagram of the induced current on the analog block 11 when no loss reduction structure is set in the wireless terminal.

[0060] Figure 5b Simulation diagram of induced current on analog block 11 when setting up a loss reduction structure in a wireless terminal.

[0061] Depend on Figure 5a It is clearly visible that a strong induced current exists on the surface of analog block 11 near the wireless terminal. However, from Figure 5b It can be clearly seen that the induced current on the surface of analog block 11 near the wireless terminal is very weak. Therefore, when the wireless terminal has a loss reduction structure, it will significantly reduce the absorption of electromagnetic waves by the human body by the antenna, thereby improving the radiation efficiency of the antenna.

[0062] Figure 6 The graph shows a comparison of antenna radiation efficiency and system efficiency between wireless terminals with and without loss reduction structures.

[0063] Figure 6 Curve 1A represents the antenna radiation efficiency curve when the loss reduction structure is set. Figure 6 Curve 2A represents the system efficiency curve when the loss reduction structure is set. Figure 6 Curve 1B represents the antenna radiation efficiency without a loss reduction structure. Figure 6 Curve 2B represents the system efficiency curve without a loss reduction structure.

[0064] As can be clearly seen from the four curves, both antenna radiation efficiency and system efficiency are improved by more than 3dB after the loss reduction structure is set. Therefore, the wireless terminal with loss reduction structure provided in this application embodiment effectively improves antenna radiation efficiency and system efficiency.

[0065] The placement of the first branch 42 and the second branch 43 can vary, and will be explained below through three embodiments.

[0066] Example 1

[0067] like Figure 2 As shown, the first side plate 101 has a first wall surface A1 and a second wall surface A2 facing each other. The first wall surface A1 faces the circuit board 3, and the second wall surface A2 faces away from the circuit board 3. The first branch 42 and the second branch 43 are located on the second wall surface A2.

[0068] In other words, the first segment 42 and the second segment 43 are located on the outer wall surface of the outer casing 1. The technical effect of this design is that when the first side plate is close to the skin, because the first and second segments are located on the outer wall surface of the first side plate, the absorption of electromagnetic waves radiated by the antenna by the human body is more significant. Furthermore, since this loss-reduction structure is also made of metal and can serve as an antenna radiator, placing the first and second segments on the outer wall surface of the outer casing increases the antenna's clearance height and improves its radiation efficiency.

[0069] Example 2

[0070] like Figure 8 As shown, the first side plate 101 has a first wall surface A1 and a second wall surface A2 facing each other. The first wall surface A1 faces the circuit board 3, and the second wall surface A2 faces away from the circuit board 3. A groove 10 is provided on the first wall surface A1, and the first branch 42 and the second branch 43 are located in the groove 10.

[0071] In other words, the first segment 42 and the second segment 43 are located on the inner wall of the outer casing 1, which improves the aesthetic appearance of the wireless terminal. Furthermore, by creating a groove in the first wall A1 and placing the first segment 42 and the second segment 43 within the groove, compared to placing them directly on the first wall, the distance between the first and second segments and the skin is reduced, resulting in a more significant reduction in the absorption of electromagnetic waves radiated by the antenna by the human body. Additionally, since this loss-reduction structure is also made of metal and can serve as an antenna radiator, placing the first and second segments within the groove further increases the antenna's clearance height and improves its radiation efficiency.

[0072] Example 3

[0073] The first branch 42 and the second branch 43 are located on the first wall surface A1.

[0074] When the first branch 42 and the second branch 43 are located on the second wall surface A2, the connecting branch 41 can be implemented in a variety of ways.

[0075] For example, refer to Figure 7 A metal through hole 7 is provided on the first side plate 101. The metal through hole 7 passes through the first wall surface A1 and the second wall surface A2, and the metal through hole 7 forms a connecting branch.

[0076] As another example, a through hole is provided on the first side plate 101, which extends through the first wall surface A1 and the second wall surface A2. The connecting branch is located in the through hole and is a metal sheet.

[0077] In the first embodiment described above, the connecting branches are formed by metal through holes, which is simple in structure and easy to implement. Therefore, this application preferably uses metal through holes to form connecting branches.

[0078] To further reduce the absorption of electromagnetic waves radiated by the antenna by the human body, refer to Figure 9 The first branch 42 and the second branch 43 are arranged symmetrically with respect to the connecting branch 41.

[0079] When the first branch 42 and the second branch 43 are symmetrically arranged about the connecting branch 41, the lengths of the first branch 42 and the second branch 43 are approximately equal. Figure 9 The length dimension X1 of the first branch 42 shown is equal to or nearly equal to the length dimension X2 of the second branch 43. In this case, the current magnitude on the first branch 42 is equal to the current magnitude on the second branch 43. Correspondingly, the induced current formed at the corresponding first branch on the skin is equal to the induced current formed at the corresponding second branch on the skin surface. Furthermore, the currents in the area of ​​the skin near the connecting branches will cancel each other out, and nearly completely cancel each other out. Therefore, this further reduces the absorption of electromagnetic waves from the antenna by the skin surface, further improving the antenna's radiation efficiency.

[0080] To further reduce the absorption of electromagnetic waves radiated by the antenna by the human body, the sum of the lengths of the first stub 42 and the second stub 43 is equal to half the propagation wavelength of the electromagnetic waves in the antenna's frequency band. (Refer to...) Figure 9 The sum of the length dimension X1 of the first branch 42 and the length dimension X2 of the second branch 43 is equal to half the propagation wavelength of the electromagnetic wave in the frequency band of the antenna.

[0081] It should be noted that the propagation wavelength of electromagnetic waves in the antenna frequency band refers to the propagation wavelength of electromagnetic waves in a medium (such as the human body).

[0082] Additionally, it should be noted that the sum of the lengths of the first stub 42 and the second stub 43 is close to half the propagation wavelength of the electromagnetic waves in the frequency band of the antenna, and is also within the scope of protection of this application.

[0083] When the sum of the lengths of the first stub 42 and the second stub 43 is equal to half the propagation wavelength of the electromagnetic wave in the antenna band, not only is the current in the area near the connecting stubs on the antenna nearly completely canceled out, but the antenna's radiation effect is also improved. Since the first and second stubs also act as radiators of the antenna, when the length of the antenna's radiators is equal to or close to one-quarter of the antenna's frequency band, the antenna's radiation effect is improved.

[0084] The connecting branch 41, the first branch 42, and the second branch 43 are made of metallic materials, and various metallic materials can be selected, such as copper, aluminum, zinc, etc. This application does not limit the materials used for the connecting branch, the first branch, and the second branch.

[0085] In addition, when the first branch and the second branch are provided on the second wall, the first branch and the second branch can be prepared by the following manufacturing method.

[0086] In some embodiments, a metal film layer is coated on the second wall surface; then, a first branch and a second branch are formed on the metal film layer. For example, the first and second branches can be formed on the metal film layer by etching or laser engraving. Alternatively, the first and second branches can be formed by exposure and development.

[0087] In other embodiments, the first and second branches are formed by transfer, screen printing, spraying, or exposure development on the second wall surface.

[0088] In addition, when the first branch and the second branch are provided in the groove of the first wall, the first branch and the second branch can be prepared by the following preparation method.

[0089] In some embodiments, a groove is formed on the first wall surface by dry etching or wet etching; a metal film layer is then covered within the groove; and a first branch and a second branch are formed on the metal film layer. For example, the first and second branches can be formed on the metal film layer by etching or laser engraving. Alternatively, the first and second branches can be formed by exposure and development.

[0090] In other embodiments, grooves are formed on the first wall surface by dry etching or wet etching; the grooves are then transferred, screen-printed, sprayed, or exposed and developed to form the first and second branches.

[0091] There are various electrical connection methods between the connecting stub and the circuit board. Three examples are listed below.

[0092] Example 1

[0093] The connecting stub 41 is electrically connected to the circuit board 3 via a capacitor. Since the circuit board 3 carries high-frequency current, and the capacitor is a component that passes high frequencies and blocks low frequencies, connecting the connecting stub 41 to the circuit board 3 via a capacitor results in a simple structure and low impedance for the entire loss reduction structure.

[0094] Example 2

[0095] The connecting stub 41 is electrically coupled to the circuit board 3. The coupling electrical connection is a non-contact electrical connection, which is simple in structure and easy to implement.

[0096] Example 3

[0097] The connecting branch 41 is connected to the circuit board 3 by a welding structure.

[0098] Of course, the connecting branch 41 can also be connected to the circuit board using other electrical connection structures. This application does not limit the specific connection structure.

[0099] In some implementations, refer to Figure 10 There are multiple first branches 42 and multiple second branches 43. The multiple first branches 42 and multiple second branches 43 correspond one-to-one. Any first branch 42 and its corresponding second branch 43 are located on both sides of the connecting branch 41.

[0100] It should be noted that the one-to-one correspondence between multiple first branches 42 and multiple second branches 43 means that the number of first branches 42 and the number of second branches 43 are equal, and in terms of layout, any first branch 42 and its corresponding second branch 43 are located on both sides of the connecting branch 41.

[0101] This loss reduction structure has multiple sets of branches, each set including a first branch and a corresponding second branch. The advantage of having multiple sets of branches is that in some applications, the first side plate has a large contact area with the skin. By setting multiple first and second branches, the phenomenon of large induced current on some parts of the skin surface and small induced current in others can be avoided. Therefore, by setting multiple sets of branches, the induced current on the skin surface is further reduced, thereby further improving the antenna's radiation efficiency.

[0102] There are two ways to arrange multiple branches, and the two methods will be explained below.

[0103] The first type: Reference Figure 10 There is a gap between each pair of adjacent branches. That is to say, each pair of adjacent branches is separate.

[0104] The second method, refer to Figure 11Each pair of adjacent branches is connected as one unit. In this way, all the branches are connected as one unit to form a rotating structure centered on the connecting branch 41.

[0105] In the second deployment method, when the wireless terminal is a wearable device, such as a watch or bracelet, refer to... Figure 12 The watch 8 or bracelet includes a dial 81 and a strap 82.

[0106] Reference Figure 13 The first side plate is the bottom cover of the dial. The first side plate has a rotating structure and is made of metal. The connection point between the connecting branch and the first side plate is located at the center of the first side plate. The first side plate forms the first branch and the second branch. In other words, the bottom cover of the dial is directly used as the first and second branches. This simplifies the overall structure of the watch compared to setting up a separate damage reduction structure.

[0107] Figure 13 The dashed lines with arrows in the diagram represent the direction of high-frequency current flow on the bottom cover when the dial's back cover is used as the first and second stubs, and when the antenna is transmitting and receiving signals.

[0108] Figure 12 The diagram shows a first branch 42 and a second branch 43 on the bottom cover plate of the dial 81, where the bottom cover plate is not used as the first and second branches. This solution is also within the scope of protection of this application.

[0109] Figure 14 As shown, the wireless terminal is a mobile phone 9, with the first branch 42 and the second branch 43 disposed on the back cover of the mobile phone 9. In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0110] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A wireless terminal, characterized in that, include: The outer shell has a first side panel for close contact with the skin; The antenna and the circuit board are both housed inside the housing. The circuit board is located close to the first side plate and is arranged opposite to the first side plate. The circuit board is the grounding terminal of the antenna. The transceiver module and the feeding structure are provided. The transceiver module is disposed on the circuit board, and the antenna is electrically connected to the transceiver module through the feeding structure. The loss reduction structure, made of metallic material, includes: Connect the branch to the circuit board; The first branch and the second branch are located on both sides of the connecting branch and are both connected to the connecting branch. The first branch and the second branch are close to the first side plate. The first branch and the second branch are both arranged in a direction parallel to the first side plate. The first branch and the second branch are both disposed on the first side plate.

2. The wireless terminal according to claim 1, characterized in that, The first branch and the second branch are arranged symmetrically with respect to the connecting branch.

3. The wireless terminal according to claim 1 or 2, characterized in that, The sum of the lengths of the first stub and the second stub is equal to half the propagation wavelength of the electromagnetic wave in the frequency band of the antenna.

4. The wireless terminal according to claim 1 or 2, characterized in that, The first side plate has opposing first and second walls, the first wall facing the circuit board and the second wall facing away from the circuit board, and the first branch and the second branch are located on the second wall.

5. The wireless terminal according to claim 4, characterized in that, The first side plate is provided with a metal through hole, which penetrates the first wall surface and the second wall surface, and the metal through hole forms the connecting branch.

6. The wireless terminal according to claim 1 or 2, characterized in that, The first side plate has a first wall and a second wall facing each other. The first wall faces the circuit board, and the second wall faces away from the circuit board. A groove is formed on the first wall, and the first branch and the second branch are located in the groove.

7. The wireless terminal according to claim 1 or 2, characterized in that, There are multiple first branches and multiple second branches, and the multiple first branches and multiple second branches correspond one-to-one. Any first branch and its corresponding second branch are located on both sides of the connecting branch.

8. The wireless terminal according to claim 7, characterized in that, Multiple first branches and multiple second branches are connected together to form a rotating structure centered on the connected branches.

9. The wireless terminal according to claim 1 or 2, characterized in that, The connecting branch is coupled to the circuit board.

10. The wireless terminal according to claim 1 or 2, characterized in that, The wireless terminal is a wearable device, which includes a watch face and a watch strap. The first segment and the second segment are disposed on the bottom cover plate of the watch face.

11. The wireless terminal according to claim 10, characterized in that, The bottom cover plate is made of metal and has a rotating structure. The bottom cover plate forms the first branch and the second branch, and the connection position of the connecting branch to the bottom cover plate is located at the center of the bottom cover plate.

12. The wireless terminal according to claim 1, characterized in that, The length of the first branch is equal to the length of the second branch.

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