Wearable device

Abstract

The embodiment of the invention provides wearable equipment, which comprises a display screen, a mainboard and a battery which are sequentially stacked, and further comprises a metal sheet, a planar antenna radiator and a feed source. The metal sheet is stacked on one side, deviating from the mainboard, of the battery and is used for grounding. The planar antenna radiator is arranged on the side, away from the battery, of the metal sheet, is spaced from the metal sheet and is parallel to the metal sheet, the planar antenna radiator comprises a grounding area and a feed area, and the grounding area is electrically connected with the metal sheet. The feed source is electrically connected with a feed area of the planar antenna radiator and is used for exciting the planar antenna radiator to work in a preset frequency band, and the planar antenna radiator generates a corresponding electric field when working in the preset frequency band; the electric field direction includes an electric field direction perpendicular to the planar antenna radiator and pointing to one side of the planar antenna radiator away from the metal sheet. When the wearable device is worn on the human body, the radiation performance can be effectively improved.

Description

Technical Field

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

[0002] At present, due to the convenience of carrying and using wearable devices, and the increasing number of functions supported by wearable devices, wearable devices are now widely used. Among them, wearable devices are generally equipped with antennas to support communication functions in a certain frequency band. However, since wearable devices are generally worn on the human body, they are often interfered by the human body, resulting in a decrease in antenna radiation performance. Summary of the invention

[0003] The present application provides a wearable device to solve the above problems.

[0004] In a first aspect, a wearable device is provided, comprising a display screen, a main board, and a battery stacked in sequence, and also comprising a metal sheet, a planar antenna radiator, and a feed source. The metal sheet is stacked on the side of the battery away from the main board for grounding. The planar antenna radiator is arranged on the side of the metal sheet away from the battery, and is spaced apart from and parallel to the metal sheet, wherein the planar antenna radiator comprises a grounding area and a feeding area, and the grounding area is electrically connected to the metal sheet. The feed source is electrically connected to the feeding area of ​​the planar antenna radiator, and is used to excite the planar antenna radiator to operate in a preset frequency band, wherein the planar antenna radiator generates a corresponding electric field when operating in the preset frequency band, and the electric field direction of the electric field comprises an electric field direction perpendicular to the planar antenna radiator and pointing to the side of the planar antenna radiator away from the metal sheet.

[0005] The wearable device of the present application adopts a planar antenna radiator, and the planar antenna radiator is located on a side of the wearable device away from the display screen, and the planar antenna radiator generates a corresponding electric field when operating in a preset frequency band, and the electric field direction of the electric field includes an electric field direction that is perpendicular to the planar antenna radiator and points to a side of the planar antenna radiator away from the metal sheet. When the wearable device is worn on a human body, the electric field direction of the electric field generated by the planar antenna radiator will point to the part of the human body where the wearable device is worn, and can stimulate the part of the human body to radiate, thereby effectively improving the radiation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the drawings required for use in the embodiments of the present application or the background technology will be described below.

[0007] Figure 1A side view showing at least part of the internal structure of a wearable device in an embodiment of the present application.

[0008] Figure 2 A schematic diagram of a wearable device worn on a human body part in an embodiment of the present application.

[0009] Figure 3 For Figure 2 An enlarged schematic diagram showing a part of the internal structure of the wearable device in region Q0 in

[0010] Figure 4 A schematic diagram of a planar antenna radiator of a wearable device in some embodiments of the present application.

[0011] Figure 5 Another schematic diagram of the planar antenna radiator of the wearable device in some embodiments of the present application.

[0012] Figure 6 A schematic diagram of the current distribution of the planar antenna radiator of the wearable device in some embodiments of the present application.

[0013] Figure 7 A schematic diagram of the electric field distribution of the planar antenna radiator of the wearable device in some embodiments of the present application.

[0014] Figure 8 A simple schematic diagram of the electric field distribution after the wearable device is worn on a human body part.

[0015] Figure 9 A simple schematic diagram of the structure and current distribution of a reference wearable device.

[0016] Figure 10 A simple schematic diagram of the electric field distribution after the reference wearable device is worn on a human body part.

[0017] Figure 11 A schematic diagram of the radiation efficiency and total system efficiency curves of the reference wearable device in different states respectively.

[0018] Figure 12 A schematic diagram of the radiation efficiency and total system efficiency curves of the wearable device in some embodiments of the present application in different states respectively.

[0019] Figure 13 Another side view of the wearable device in some embodiments of the present application.

[0020] Figure 14 A schematic diagram of the internal structure without the back cover viewed from the back side of the wearable device.

[0021] Figure 15Another side view of the wearable device in some embodiments of the present application.

[0022] Figure 16 Schematic diagram of the internal structure of the wearable device in some embodiments of the present application, viewed from the back side after removing the back cover and the frame.

[0023] Figure 17 Another side view of the wearable device in some embodiments of the present application.

[0024] Figure 18 Antenna pattern obtained from the simulation test when the wearable device in some embodiments of the present application is in the worn state. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] In the description of the embodiments of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "thickness", "width", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than implying or indicating 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 construed as a limitation of the present invention. The term "connection" in the present application includes meanings such as physical structural connection, electrical connection, direct connection or indirect connection, and can be specifically determined according to the required connection situation. In the description of the embodiments of the present invention, the terms "first", "second", "third", "fourth", etc. are not specific, but are used to distinguish objects with the same name. In the case where there is a description in the specification, the objects with the same name referred to by the terms "first", "second", "third", "fourth", etc. can be the same object.

[0027] Please refer to Figure 1, is a side view showing at least part of the internal structure of the wearable device 100 in an embodiment of the present application. The wearable device 100 includes a display screen 1, a main board 2, and a battery 3 that are stacked in sequence. The wearable device 100 further includes a planar antenna radiator 5 and a feed source 6. The metal sheet 4 is stacked on the side of the battery 3 facing away from the main board 2, and the metal sheet 4 is used for grounding. The planar antenna radiator 5 is disposed on the side of the metal sheet 4 facing away from the battery 3, and is spaced and parallel to the metal sheet 4. Among them, the planar antenna radiator 5 includes a grounding area Q1 and a feeding area Q2, and the grounding area Q1 is electrically connected to the metal sheet 4. The feed source 6 is electrically connected to the feeding area Q2 of the planar antenna radiator 5, and is used to excite the planar antenna radiator 5 to operate in a preset frequency band. Among them, when the planar antenna radiator operates in the preset frequency band, a corresponding electric field is generated, and the electric field direction of the electric field includes an electric field direction perpendicular to the planar antenna radiator 5 and pointing to the side of the planar antenna radiator 5 facing away from the metal sheet 4.

[0028] Therefore, in the present application, the planar antenna radiator 5 is adopted. Since the display screen 1, the main board 2, and the battery 3 are stacked in sequence, and the planar antenna radiator 5 is disposed on the side of the metal sheet 4 facing away from the battery 3, therefore, the planar antenna radiator 5 is located on the side of the wearable device 100 away from the display screen 1, that is, generally on the back side of the wearable device 100. Since a corresponding electric field is generated when the planar antenna radiator 5 operates in a preset frequency band, and the electric field direction of the electric field includes an electric field direction perpendicular to the planar antenna radiator 5 and pointing to the side of the planar antenna radiator 5 facing away from the metal sheet 4, when the wearable device 100 is worn on the human body, at least part of the electric field direction of the electric field generated by the planar antenna radiator will point to the human body part. Therefore, at least part of the electric field with the electric field direction pointing to the human body part can excite the human body part to radiate, thereby effectively improving the radiation performance.

[0029] Among them, since the display screen 1, the main board 2, and the battery 3 are stacked in sequence, and the metal sheet 4 is stacked on the side of the battery 3 facing away from the main board 2, and the planar antenna radiator 5 is spaced and parallel to the metal sheet 4, it is thus roughly on one side of the back of the wearable device 100, and the surface of the planar antenna radiator 5 is roughly parallel to the surfaces of the display screen 1 and the like. Thus, when the wearable device 100 is worn on a human body part, the planar antenna radiator 5 will be close to the human body part and roughly parallel to the surface of the human body part. Since the planar antenna radiator generates a corresponding electric field when operating in a preset frequency band, the direction of the electric field of the electric field includes an electric field direction perpendicular to the planar antenna radiator and pointing to the side of the planar antenna radiator 5 facing away from the metal sheet 4. Thus, the electric field direction pointing to the side of the planar antenna radiator 5 facing away from the metal sheet 4 is roughly perpendicular to the human body part. Among them, since the human body parts such as the arm on which the wearable device 100 is worn are usually a mixture composed of fat, muscle, bone, and water, and have the characteristics of high dielectric constant, low conductivity, and high loss factor, therefore, the electric field energy with the electric field direction perpendicular to the human body part can effectively excite the human body part with the characteristic of high dielectric constant to radiate, and the radiation characteristic of the human body part is far superior to the loss characteristic, thereby effectively improving the radiation performance.

[0030] Among them, in the present application, the stacking direction of the display screen 1, the main board 2, the battery 3, and the metal sheet 4 can be the thickness direction of the display screen 1, the main board 2, the battery 3, and the metal sheet 4. The surfaces with the largest areas of the display screen 1, the main board 2, the battery 3, and the metal sheet 4 are all parallel to each other, and the stacking direction of the display screen 1, the main board 2, the battery 3, and the metal sheet 4 can also be the direction perpendicular to the surfaces with the largest areas of the display screen 1, the main board 2, the battery 3, and the metal sheet 4. Among them, the planar antenna radiator 5 being parallel to the metal sheet 4 specifically means that the surface with the largest area of the planar antenna radiator 5 is parallel to the surface with the largest area of the metal sheet 4.

[0031] Among them, in the present application, the planar antenna radiator 5 being parallel to the metal sheet 4 is not parallel in the strict sense, but roughly parallel. For example, the included angle between the surface with the largest area of the planar antenna radiator 5 and the surface with the largest area of the metal sheet 4 within ±30° can be regarded as parallel.

[0032] Among them, in the present application, the electric field direction of the electric field being perpendicular to the planar antenna radiator 5 means that the electric field direction of the electric field is perpendicular to the surface with the largest area of the planar antenna radiator 5.

[0033] In some embodiments, the planar antenna radiator 5 is generally plate-shaped or sheet-shaped. The metal sheet 4 and the planar antenna radiator 5 can be relatively thin, but still have a certain thickness, including a plurality of non-coplanar regions / surfaces. The surface with the largest area of the metal sheet 4 and the planar antenna radiator 5 can be the region / surface with the largest area of the metal sheet 4 and the planar antenna radiator 5.

[0034] Correspondingly, the display screen 1, the main board 2, and the battery 3 can also each include a plurality of non-coplanar regions / surfaces. The surface with the largest area of the display screen 1, the main board 2, and the battery 3 can be the region / surface with the largest area of the display screen 1, the main board 2, and the battery 3.

[0035] In some embodiments, the planar antenna radiator 5 only generally presents a planar or flat shape as a whole. The surface with the largest area of the planar antenna radiator 5 can be a flat surface or a non-flat surface. For example, it can be a concave-convex surface. Or, the planar antenna radiator 5 can also have a certain degree of curvature, such that the surface with the largest area of the planar antenna radiator 5 can be an arc surface with a certain degree of curvature, and so on.

[0036] Please refer to Figure 2 and Figure 3 , Figure 2 which is a schematic diagram of the wearable device 100 of an embodiment of the present application worn on the human body part 200. Figure 3 is Figure 2 an enlarged schematic diagram showing a partial internal structure of the wearable device 100 in the region Q0 in

[0037] Among them, as Figure 2 and Figure 3As shown, when the wearable device 100 is worn on the human body part 200, the planar antenna radiator 5 is closer to the human body part 200 than the display screen 1, the main board 2, the battery 3, and the metal sheet 4. That is, the planar antenna radiator 5 is disposed on the side of the wearable device 100 facing away from the display screen 1. Further, the planar antenna radiator 5 is disposed on the side of the wearable device 100 that is close to the human body part 200 when the wearable device 100 is worn on the human body part 200. Thus, the planar antenna radiator 5 operates in the preset frequency band under the excitation of the feed source 6, thereby supporting the transceiver of the electromagnetic wave signal in the preset frequency band. And when the wearable device 100 is worn on the human body part 200, the planar antenna radiator 5 will be close to the human body part and be substantially parallel to the surface of the human body part. Thus, the direction of the electric field pointing to the side of the planar antenna radiator 5 facing away from the metal sheet 4 is substantially perpendicular to the human body part, which can effectively excite the human body part with the characteristic of high dielectric constant to radiate, thereby effectively improving the radiation performance.

[0038] Among them, Figure 2 and Figure 3 in which the human body part 200 is shown as an arm, and the wearable device 100 can be a device such as a watch or a bracelet worn on the arm. Obviously, in other embodiments, the human body part 200 can also be other parts of the human body, and the wearable device 100 can also be a device worn on other parts of the human body. For example, the human body part 200 can also be the head, and the wearable device 100 can also be a device such as glasses worn on the human head.

[0039] Among them, the planar antenna radiator 5 is spaced and parallel to the metal sheet 4, so that it is grounded only by being electrically connected to the metal sheet 4 through the grounding area Q1. In addition, there is a gap between the planar antenna radiator 5 and the metal sheet 4, so that the electromagnetic wave signal in the preset frequency band emitted by the planar antenna radiator 5 can be radiated through the gap between the planar antenna radiator 5 and the metal sheet 4, thereby ensuring the antenna performance.

[0040] Among them, the interval between the planar antenna radiator 5 and the metal sheet 4 is a preset interval, and the preset interval can be, for example, a value within 0.05 mm (millimeter) to 5 mm. In some embodiments, the preset interval can be 1 mm.

[0041] Please refer to Figure 4, which is a schematic diagram of the planar antenna radiator 5 of the wearable device 100 in some embodiments of the present application. Among them, in some embodiments, the planar antenna radiator 5 is a PIFA (Planar Inverted F Antenna) antenna. The planar antenna radiator 5 is square, including two opposite first sides B1 and two opposite second sides B2. The grounding area Q1 is arranged at a position close to one of the first sides B1, and the feeding area Q2 is generally arranged between the grounding area Q1 and the other first side B1.

[0042] That is, in some embodiments, the planar antenna radiator 5 is grounded at the grounding area Q1 close to one of the first sides B1, and fed at the feeding area Q2 between the grounding area Q1 and the other first side B1. Among them, the other first side B1 is open, thus forming the PIFA antenna structure.

[0043] In some embodiments, as Figure 4 shown, the feeding area Q2 is generally arranged between the grounding area Q1 and the other first side B1, and close to one of the second sides B2. That is, Figure 4 In, an example is schematically shown in which the feeding area Q2 is generally arranged between the grounding area Q1 and the other first side B1, and close to one of the second sides B2. In some embodiments, the feeding area Q2 is generally arranged between the grounding area Q1 and the other first side B1, and can be at any suitable position in the planar antenna radiator 5. For example, it can also be located at the center position of the planar antenna radiator 5, and so on.

[0044] In the present application, the grounding area Q1 is arranged at a position close to one of the first sides B1, which may include the case where the distance between the feeding area Q2 and the first side B1 is less than a preset distance, such as 1 centimeter, and may also include the case where the feeding area Q2 is directly arranged on the first side B1.

[0045] Among them, when the feeding area Q2 is close to one of the second sides B2, it may include the case where the distance between the feeding area Q2 and the second side B2 is less than a preset distance, such as 1 centimeter, and may also include the case where the feeding area Q2 is directly arranged on the second side B2.

[0046] Among them, as Figure 4 shown, the feeding area Q2 is also close to the other first side B1 at the same time. That is, Figure 4More specifically, the feeding area Q2 is simultaneously close to the second side B2 and another first side B1 that is far from the grounding area Q1. Wherein, the feeding area Q2 is also close to another first side B1 and has a certain interval from the another first side B1, so that the another first side B1 remains open circuit, thereby forming a PIFA antenna.

[0047] Wherein, Figure 1 The side view of... can be a side view seen from one side of the first side B1 close to the grounding area Q1 in... Figure 4 in...

[0048] In some embodiments, such as Figure 1 and Figure 4 shown, the grounding area Q1 is strip-shaped, and the extending direction of the grounding area Q1 is the same as the extending direction of the first side B1. In some embodiments, such as Figure 1 and Figure 4 shown, the length of the grounding area Q1 is substantially the same as the length of the first side B1, that is, in some embodiments, the first side B1 of the planar antenna radiator 5 can be integrally electrically connected to the metal sheet 4 and grounded as a whole. Obviously, in other embodiments, the length of the grounding area Q1 can also be less than the length of the first side B1. For example, it can be 1 / 2, 2 / 3, etc. of the length of the first side B1.

[0049] Wherein, the length of the grounding area Q1 is the dimension in the extending direction of the grounding area Q1, and the length of the first side B1 is the dimension in the extending direction of the first side B1. Wherein, the extending direction of the grounding area Q1 can specifically be the extending direction of the longest side of the grounding area Q1.

[0050] In some embodiments, such as Figure 1 and Figure 4 and other figures shown, the feeding area Q2 can be a relatively small area, the dimension of the projection of the feeding area Q2 on the first side B1 is less than the length of the first side B1, and the dimension of the projection of the feeding area Q2 on the second side B2 is less than the length of the second side B2. Wherein, the area of the feeding area Q2 only needs to meet the feeding requirement. In some embodiments, the feeding area Q2 can also be a feeding point.

[0051] Wherein, Figure 4 can also be regarded as a top view seen from the side of the planar antenna radiator 5 close to the metal sheet 4.

[0052] Please refer to Figure 5 together, which is another schematic diagram of the planar antenna radiator 5 of the wearable device 100 in some embodiments of the present application. Wherein, Figure 5Can be Figure 4 An equivalent schematic diagram of a cross-section obtained by intercepting the planar antenna radiator 5 along a cross-section passing through the feeding area Q2 parallel to the second side B2, or a side view equivalent schematic diagram viewed from one side of the second side B2 of the planar antenna radiator 5.

[0053] Among them, as described above, the grounding area Q1 is arranged at a position close to one of the first sides B1, and the feeding area Q2 is generally arranged between the grounding area Q1 and the other first side B1. Therefore, viewed from one side of the second side B2 of the planar antenna radiator 5, as Figure 3 shown, the grounding area Q1 is arranged at a position close to one of the first sides B1 to be grounded, the feeding area Q2 is generally arranged between the grounding area Q1 and the other first side B1, and the other first side B1 is open-circuited, thus forming an IFA antenna. In addition, the planar antenna radiator 5 is a flat plate, which is substantially parallel to the aforementioned metal sheet 4. Therefore, as a whole, a PIFA antenna, that is, a planar inverted F antenna, is formed. In some embodiments, the planar antenna radiator 5 can be a metal plate or a metal sheet.

[0054] In some embodiments, the equivalent electrical length of the second side B2 of the planar antenna radiator 5 is λ / 4, where λ is the wavelength corresponding to the preset frequency band.

[0055] That is, in some embodiments, the current generated by the planar antenna radiator 5 under the excitation of the feed source 6 generally flows from the first side B1 close to the grounding area Q1 to the other first side B1 that is open-circuited. Therefore, the equivalent electrical length between the two opposite first sides B1 is nλ + λ / 2, which meets the resonance requirements of the preset frequency band. Thus, the planar antenna radiator 5 can support the transceiver of electromagnetic wave signals in the preset frequency band. And since the distance length between the two first sides B1 is equal to the length of the second side B2. Therefore, the equivalent electrical length between the two opposite first sides B1 is also approximately equal to the equivalent electrical length of the second side B2. Therefore, when the equivalent electrical length of the second side B2 of the planar antenna radiator 5 is λ / 4, the resonance requirements of the preset frequency band are met. Thus, the planar antenna radiator 5 can support the transceiver of electromagnetic wave signals in the preset frequency band.

[0056] Among them, in some embodiments of the present application, the equivalent electrical length of the second side B2 can be the equivalent electrical length of the second side B2 itself. For example, it can be approximately equal to the length of the second side B2. In some embodiments, when the planar antenna radiator 5 is further connected with a matching unit for realizing matching adjustment, the equivalent electrical length of the second side B2 can also be the equivalent electrical length equivalent with the cooperation of the connected matching unit.

[0057] Thus, the planar antenna radiator 5 can support the transmission and reception of electromagnetic wave signals in the preset frequency band. When the wearable device 100 is worn on a human body, the planar antenna radiator 5 will be close to the human body and roughly parallel to the surface of the human body. Therefore, since the planar antenna radiator generates a corresponding electric field when operating in the first frequency band, the electric field direction of the electric field includes an electric field direction that is perpendicular to the planar antenna radiator and points to the side of the planar antenna radiator 5 that is away from the metal sheet 4. Therefore, the electric field direction pointing to the side of the planar antenna radiator 5 that is away from the metal 4 is roughly perpendicular to the human body. The electric field with the electric field direction pointing to the human body can effectively stimulate the human body to radiate electromagnetic wave signals in the preset frequency band, thereby effectively improving the radiation performance of the preset frequency band.

[0058] Among them, Figure 5 As shown, the planar antenna radiator 5 can be specifically a rectangle, the first side B1 is a short side, and the second side B2 is a long side, that is, the first side B1 close to and parallel to the grounding area Q1 is a short side. Therefore, only the electrical length of the second side B2 needs to meet λ / 4, and the first side B1 can be made shorter, which is conducive to reducing the overall size of the planar antenna radiator 5 and reducing the space occupied by the wearable device 100.

[0059] Please also read Figure 6 and Figure 7 ,in, Figure 6 is a schematic diagram of current distribution of the planar antenna radiator 5 of the wearable device 100 in some embodiments of the present application, Figure 7 Schematic diagram of the electric field distribution of the planar antenna radiator 5 of the wearable device 100 in some embodiments of the present application. Figure 6 and Figure 7 The partial structure of the wearable device 100 viewed from the side of the planar antenna radiator 5 is also illustrated.

[0060] Among them, Figure 6 As shown, as mentioned above, the planar antenna radiator 5 generates a current i1 flowing from the first side B1 close to the ground area Q1 to the other first side B1 that is open under the excitation of the feed source 6, that is, the current i1 is conducted along the extension direction of the second side B2 of the planar antenna radiator 5. Figure 6As shown, the current i1 is mainly distributed in the region near the second side B2 of the planar antenna radiator 5, that is, the current i1 generated by the planar antenna radiator 5 under the excitation of the feed source 6 mainly conducts along the second side B2, and the direction of the current i1 is from the first side B1 close to the grounding region Q1 towards the other open first side B1.

[0061] As Figure 7 shown, and as described above, the planar antenna radiator 5 will also generate an electric field E1 under the excitation of the feed source 6. As Figure 7 shown, the electric field direction of the electric field E1 is perpendicular to the plane of the planar antenna radiator 5 and includes the electric field direction pointing to the side of the planar antenna radiator 5 away from the metal sheet 4.

[0062] Among them, due to the characteristics of the planar antenna radiator 5 and the above current distribution characteristics, an electric field perpendicular to the plane of the planar antenna radiator 5 will be excited on the planar antenna radiator 5. In some embodiments, the electric field direction of the electric field E1 generated by the planar antenna radiator 5 under the excitation of the feed source 6 will simultaneously include the electric field direction pointing to the side of the planar antenna radiator 5 away from the metal sheet 4 and the electric field direction pointing to the side of the planar antenna radiator 5 towards the metal sheet 4. Among them, due to the function of the metal sheet 4, the electric field direction of the electric field generated by the planar antenna radiator 5 pointing to the side of the planar antenna radiator 5 towards the metal sheet 4 will be absorbed or reflected by the metal sheet 4 and be constrained between the planar antenna radiator 5 and the metal sheet 4. Among them, as described above, the electric field E1 generated by the planar antenna radiator 5 under the excitation of the feed source 6 for exciting the human body part is mainly the electric field with the electric field direction pointing to the side of the planar antenna radiator 5 away from the metal sheet 4.

[0063] Please refer to Figure 8 together, which is a simple schematic diagram of the electric field distribution after the wearable device 100 is worn on the human body part. Among them, as described above, the planar antenna radiator 5 will generate an electric field E1 perpendicular to the plane of the planar antenna radiator 5 and pointing to the side of the planar antenna radiator 5 away from the metal sheet 4 under the excitation of the feed source 6. When the wearable device 100 is worn on the human body part 200, the side of the planar antenna radiator 5 away from the metal sheet 4 is the side close to the human body part 200. Thus, as Figure 8As shown, when the wearable device 100 is worn on the human body part 200, the direction of the electric field E1 generated by the planar antenna radiator 5 points from the wearable device 100 to the human body part 200. The electric field E1 can effectively excite the human body part to radiate electromagnetic wave signals in the preset frequency band, thereby effectively improving the radiation performance in the preset frequency band.

[0064] Please refer to Figure 9 , which is a schematic diagram of the simple structure and current distribution of a reference wearable device 100'. Among them, Figure 9 shows that the reference wearable device 100' includes a metal frame 101' and a main board 102'. Among them, the reference wearable device 100' also includes a metal watch face (not shown in the figure). Among them, in the reference wearable device 100', the coupling between the metal frame 101' and the metal watch face is mainly utilized to support corresponding frequency bands, such as the preset frequency band.

[0065] As Figure 9 shown, when the reference wearable device 100' operates in the corresponding frequency band, it will excite the main board 102' to generate a current i1' flowing along the edge. In addition, it will also excite the metal frame 101' surrounding the main board 102' to generate a current i2' with a direction opposite to that of the current i1' on the main board 102'. Since the current i1' and the current i2' are respectively concentrated on the edge of the main board 102' and the metal frame 101', an electric field will be generated between the main board 102' and the metal frame 101'.

[0066] Please refer to Figure 10 , which is a simple schematic diagram of the electric field distribution after the reference wearable device 100' is worn on the human body part 200. Among them, as described above, since the current i1' and the current i2' are respectively concentrated on the edge of the main board 102' and the metal frame 101', thus as Figure 10 shown, an electric field E1 will be generated between the main board 102' and the metal frame 101', such as the electric field E1' pointing from the main board 102' to the metal frame 101' as Figure 10 shown. Thus, when the reference wearable device 100' is worn on the human body part 200, the direction of the electric field E1' is parallel to the surface of the human body part 200 and is easily absorbed by the human body part 200, resulting in a decrease in the antenna radiation performance of the reference wearable device 100'.

[0067] Please refer to Figure 11 , which is a schematic diagram of the radiation efficiency and total system efficiency curves of the reference wearable device 100' in different states. Among them, Figure 11 can beFigure 9 Schematic diagram of the radiation efficiency and total system efficiency curves obtained by simulating the operation of the reference wearable device 100' at the preset frequency band in different wearing states.

[0068] Among them, Figure 11 It shows the radiation efficiency curve Sr1' and the total system efficiency curve St1' obtained by simulating the operation of the reference wearable device 100' at the preset frequency band in the non-worn state, that is, the free space state, and the radiation efficiency curve Sr2' and the total system efficiency curve St2' obtained by simulating the operation of the reference wearable device 100' at the preset frequency band in the worn state.

[0069] Among them, Figure 11 Taking the preset frequency band as the GPS L1 frequency band as an example, the frequency range of the GPS L1 frequency band is 1559 MHz to 1610 MHz, and the resonant frequency is approximately 1.6 GHz, that is, 1600 MHz.

[0070] From Figure 11 It can be seen that when the reference wearable device 100' is in the non-worn state, at the resonant frequency of 1.6 GHz in the GPS L1 frequency band, the radiation efficiency of the reference wearable device 100' is approximately -4.4 dB, and the total system efficiency is approximately -5.5 dB. When the reference wearable device 100' is in the worn state, at the resonant frequency of 1.6 GHz in the GPS L1 frequency band, the radiation efficiency of the reference wearable device 100' is approximately -11.57 dB, and the total system efficiency is approximately -12 dB. The radiation efficiency of the reference wearable device 100' in free space drops by nearly 7.2 dB compared to when the reference wearable device 100' is in the worn state.

[0071] Therefore, after the reference wearable device 100' is worn, the antenna radiation performance of the reference wearable device 100' has significantly decreased.

[0072] Among them, Figure 11 Only taking the preset frequency band as the GPS L1 frequency band as an example, obviously, the preset frequency band can be other frequency bands, for example, it can also include other GPS frequency bands, such as the GPS L5 frequency band, or it can also be other frequency bands such as the Bluetooth frequency band, the medium and high frequency band, and the high frequency band such as N78.

[0073] Please refer to Figure 12 , which is a schematic diagram of the radiation efficiency and total system efficiency curves of the wearable device 100 in some embodiments of the present application in different states. Among them, Figure 12It is a schematic diagram of the radiation efficiency and system total efficiency curves obtained by simulating the operation of the wearable device 100 of the present application at the preset frequency band in different wearing states.

[0074] Among them, Figure 12 It shows the radiation efficiency curve Sr1 and system total efficiency curve St1 obtained by simulating the operation of the wearable device 100 in the non-worn state, that is, the free space state, at the preset frequency band, and the radiation efficiency curve Sr2 and system total efficiency curve St2 obtained by simulating the operation of the wearable device 100 in the worn state at the preset frequency band.

[0075] Among them, Figure 12 Taking the preset frequency band as the GPS L1 frequency band as an example, the frequency range of the GPS L1 frequency band is 1559 MHz to 1610 MHz, and the resonance frequency is approximately 1.6 GHz, that is, 1600 MHz.

[0076] Among them, Figure 12 It shows the radiation efficiency curve Sr1 and system total efficiency curve St1 obtained by simulating the operation of the wearable device 100 in the non-worn state, that is, the free space state, at the preset frequency band, and the radiation efficiency curve Sr2 and system total efficiency curve St2 obtained by simulating the operation of the wearable device 100 in the worn state at the preset frequency band.

[0077] From Figure 12 It can be seen that when the wearable device 100 is in the non-worn state, at the resonance frequency of 1.6 GHz in the GPS L1 frequency band, the radiation efficiency of the wearable device 100 is approximately -13.77 dB, and the system total efficiency is approximately -14.9 dB. When the wearable device 100 is in the worn state, at the resonance frequency of 1.6 GHz in the GPS L1 frequency band, the radiation efficiency of the wearable device 100 is approximately -7.4 dB, and the system total efficiency is also approximately -7.4 dB. The radiation efficiency of the wearable device 100 in free space drops by nearly 7.2 dB compared to the wearable device 100' in the worn state.

[0078] It can be seen that when the wearable device 100 of the present application is not worn, the radiation efficiency and the total system efficiency in the preset frequency band, such as the GPS L1 frequency band, are not high. However, when the wearable device 100 is worn, the radiation efficiency and the total system efficiency in the preset frequency band are significantly improved to -7.4dB, and the antenna radiation performance is good. Since the use scenario of wearable devices is usually when they are worn, the radiation efficiency and the total system efficiency in the preset frequency band of the wearable device 100 of the present application are significantly improved when they are worn, which meets and improves the antenna radiation performance of the wearable device 100 under normal use.

[0079] Please also read Figure 13 and Figure 14 , Figure 13 This is another side view of the wearable device 100 in some embodiments of the present application. Figure 14 Schematic diagram of the internal structure of the wearable device 100 with the back cover 7 removed, viewed from the back side.

[0080] Among them, Figure 13 as well as Figure 14 As shown, the wearable device 100 further includes a back cover 7 and a frame 8, and the back cover 7, the frame 8 and the display screen 1 cooperate to form a receiving space S1. Figure 13 and Figure 14 As shown, the main board 2, battery 3, metal sheet 4, planar antenna radiator 5, and feed source 6 are arranged in the accommodation space S1, and the planar antenna radiator 5 is arranged adjacent to the back cover 7. That is, the planar antenna radiator 5 is closer to the back cover 7 than the main board 2, battery 3, metal sheet 4, etc.

[0081] That is, in some embodiments, the wearable device 100 further includes a back cover 7 and a frame 8, and the back cover 7, the frame 8 and the display screen 1 enclose a shell of the wearable device 100, thereby defining and forming a receiving space S1.

[0082] In some embodiments, the planar antenna radiator 5 is disposed on the inner surface 71 of the back cover 7, or the planar antenna radiator 5 is disposed on the side of the metal sheet 4 away from the battery 3 through an insulating member and is spaced from the metal sheet 4 by the insulating member.

[0083] That is, in some embodiments, the planar antenna radiator 5 may be disposed on the inner surface 71 of the rear cover 7 so as to be fixed in the wearable device 100 and spaced apart from the metal sheet 4. Alternatively, in some embodiments, the planar antenna radiator 5 is disposed on a side of the metal sheet 4 facing away from the battery 3 through an insulating member, fixed in the wearable device 100, and spaced apart from the metal sheet 4 through the insulating member.

[0084] Among them, Figure 13 taking the planar antenna radiator 5 disposed on the inner surface 71 of the rear cover 7 as an example is schematically shown.

[0085] Among them, when the planar antenna radiator 5 is disposed on the inner surface 71 of the rear cover 7, the planar antenna radiator 5 can be fixed on the inner surface 71 of the rear cover 7 by means of adhesion, clamping, etc. In some embodiments, the planar antenna radiator 5 can also be formed on the inner surface 71 of the rear cover 7 by means of laser forming, etc.

[0086] Please refer to Figure 15 , which is another side view of the wearable device 100 in some embodiments of the present application. Among them, Figure 15 The difference from Figure 13 is that the planar antenna radiator 5 is disposed on a side of the metal sheet 4 facing away from the battery 3 through an insulating member 45, fixed in the wearable device 100, and spaced apart from the metal sheet 4 through the insulating member 45.

[0087] Among them, as Figure 15 shown, when the planar antenna radiator 5 is disposed on a side of the metal sheet 4 facing away from the battery 3 through the insulating member 45, there may be a gap between a side of the planar antenna radiator 5 facing away from the metal sheet 4 and the rear cover 7, so as to facilitate disassembly and assembly of the wearable device 100 from the rear cover 7.

[0088] Among them, in some embodiments, when the planar antenna radiator 5 is disposed on a side of the metal sheet 4 facing away from the battery 3 through the insulating member 45, the insulating member 45 may be an insulating substrate, and the insulating substrate is fixedly connected to the metal sheet 4 and the planar antenna radiator 5 respectively by means of adhesion, clamping, etc., so that the planar antenna radiator 5 is fixed to the insulating substrate and fixed to the metal sheet 4 through the insulating substrate.

[0089] In some embodiments, the insulating member 45 may also be an insulating adhesive layer, and the planar antenna radiator 5 is adhered to a surface of the metal sheet 4 facing away from the battery 3 through the insulating member 45.

[0090] Among them, in the present application, the display screen 1, the main board 2, and the battery 3 are stacked in sequence, and the metal sheet 4 is stacked on the side of the battery 3 facing away from the main board 2, just to illustrate that the mutual positional relationship among the display screen 1, the main board 2, the battery 3, and the metal sheet 4 is arranged in sequence. Any two adjacent components among the display screen 1, the main board 2, the battery 3, and the metal sheet 4 may be in direct contact, or may also include other structures. For example, an adhesive layer may also be included between the battery 3 and the metal sheet 4. Also, for example, in some embodiments, a middle frame is further included between the display screen 1 and the main board 2, and the middle frame is used to carry the display screen 1 and the main board 2, that is, the display screen 1 and the main board 2 can be respectively carried on both sides of the middle frame.

[0091] In some embodiments, the metal sheet 4 is grounded by being connected to the main board ground on the main board 2. In some embodiments, when a middle frame is further included between the display screen 1 and the main board 2, the middle frame can be used as the ground of the whole machine, the middle frame is connected to the main board ground of the main board 2, and the metal sheet 4 can also be directly connected to the middle frame and grounded.

[0092] In some embodiments, the rear cover 7 is made of an insulating material. That is, in some embodiments, the rear cover 7 is made of an insulating material, so that when the wearable device 100 is worn on a human body part, it does not affect the electric field generated by the planar antenna radiator 5 from being transmitted to the human body part.

[0093] In some embodiments, the rear cover 7 can be made of insulating materials such as glass materials, ceramic materials, resin materials, plastic materials, etc.

[0094] In some embodiments, the frame 8 can be made of a metal material or can also be made of an insulating material. Among them, when the frame 8 is made of an insulating material, the rear cover 7 and the frame 8 can be an integrally formed structure.

[0095] In some embodiments, as Figure 1 and Figure 13 、 Figure 15 shown in the figures such as, the grounding area Q1 is electrically connected to the metal sheet 4 through a first electrical connector J1.

[0096] That is, in some embodiments, the grounding area Q1 is electrically connected to the metal sheet 4 through the corresponding first electrical connector J1, so as to realize the electrical connection between the grounding area Q1 and the metal sheet 4.

[0097] In some embodiments, the first electrical connector J1 is a flexible printed circuit board (FPC, Flexible printed circuit board), a transmission wire, or a conductive elastic sheet.

[0098] Among them, when the planar antenna radiator 5 is fixed to the metal sheet 4 through the insulating member 45, the first electrical connector J1 can extend from the side of the insulating member 45 to electrically connect the metal sheet 4 and the planar antenna radiator 5, or the first electrical connector J1 can also pass through a through hole or other structures provided on the insulating member 45 to electrically connect the metal sheet 4 and the planar antenna radiator 5. Among them, Figure 15 Taking the example that the first electrical connector J1 can also pass through a through hole or other structures provided on the insulating member 45 to electrically connect the metal sheet 4 and the planar antenna radiator 5, therefore, the first electrical connector J1 is Figure 15 blocked by the insulating member 45 and is not visible.

[0099] In some embodiments, such as Figure 1 and Figure 13 , Figure 15 as shown in the figures, the length of the grounding region Q1 is substantially the same as the length of the first side B1, and the first electrical connector J1 also extends along the first side B1 to electrically connect the entire grounding region Q1 and the corresponding region of the metal sheet 4. Among them, the first electrical connector J1 can be sheet-shaped / plate-shaped, and the size and shape of the end of the first electrical connector J1 connected to the grounding region Q1 can be adapted to the size and shape of the grounding region Q1.

[0100] Among them, the two ends of the first electrical connector J1 can be respectively connected to the grounding region Q1 and the metal sheet 4 by welding, abutting or other means to achieve electrical connection.

[0101] In some embodiments, such as Figure 1 and Figure 13 , Figure 15 as shown in the figures, the feed source 6 is electrically connected to the feeding region Q2 through the second electrical connector J2.

[0102] That is, in some embodiments, the feed source 6 is electrically connected to the feeding region Q2 through the corresponding second electrical connector J2 to achieve the electrical connection between the feed source 6 and the feeding region Q2.

[0103] In some embodiments, the second electrical connector J2 can also be a flexible circuit board, a transmission wire or a conductive elastic sheet.

[0104] In some embodiments, such as Figure 1 and Figure 13 , Figure 15 as shown in the figures, the feed source 6 is disposed on the main board 2, one end of the second electrical connector J2 is electrically connected to the feed source 6, and the other end extends through the battery 3 and the metal sheet 4 and then is electrically connected to the feeding region Q2.

[0105] In some embodiments, the feed source 6 is disposed on the surface of the main board 2 facing the battery 3 and outside the area of the main board 2 corresponding to the battery 3. Thus, through the second electrical connector J2 extending through the battery 3 and the metal sheet 4, the feed source 6 and the feeding area Q2 of the planar antenna radiator 5 can be electrically connected.

[0106] In some embodiments, the other end of the second electrical connector J2 can be electrically connected to the feeding area Q2 by means such as welding or abutting. When one end of the second electrical connector J2 is directly connected to the feed source 6, the connection between the end of the second electrical connector J2 and the feed source 6 can also be electrically connected by means such as welding or abutting.

[0107] Please refer to Figure 16 , which is a schematic internal structure diagram of the wearable device 100 without the back cover 7 and the frame 8 as viewed from the back side in some embodiments of the present application.

[0108] Among them, as Figure 1 , Figure 13 and Figure 16 described, the size of the planar antenna radiator 5 is smaller than that of the metal sheet 4 and the battery 3, and the sizes of the metal sheet 4 and the battery 3 are smaller than that of the main board 2. And in some embodiments, the projection of the planar antenna radiator 5 on the metal sheet 4 is located within the metal sheet 4. Therefore, in order to electrically connect the feed source 6 on the main board 2 to the feeding area Q2 on the planar antenna radiator 5, the second electrical connector J2 is a bent structure.

[0109] As Figure 1 , Figure 13 and Figure 16 shown, the second electrical connector J2 includes a first connecting portion J21 and a second connecting portion J22 that are connected to each other. Among them, the first connecting portion J21 extends from the main board 2 along the stacking direction of the display screen 1, the main board 2, the battery 3, and the metal sheet 4 through the display screen 1, the main board 2, the battery 3, and the metal sheet 4 until it reaches a position substantially flush with the planar antenna radiator 5, and the second connecting portion J22 extends along a direction substantially parallel to the plane where the planar antenna radiator 5 is located and extends to the feeding area Q2 of the planar antenna radiator 5 to be electrically connected to the feeding area Q2 of the planar antenna radiator 5.

[0110] In some embodiments, as Figure 16As shown, the wearable device 100 further includes a matching unit M1, which is connected between the feed 6 and the second electrical connector J2 for impedance matching. That is, in some embodiments, the wearable device 100 further includes the matching unit M1. The feed 6 is electrically connected to the second electrical connector J2 through the matching unit M1, and the matching unit M1 is electrically connected to the feeding area Q2 of the planar antenna radiator 5 through the second electrical connector J2. As mentioned above, in some embodiments, when the planar antenna radiator 5 is also connected with a matching unit M1 for matching adjustment, the equivalent electrical length of the second side B2 can be the equivalent electrical length equivalent with the cooperation of the matching unit M1.

[0111] In some embodiments, impedance matching is achieved by adding the matching unit M1, which can resonate better in the preset frequency band.

[0112] In some embodiments, as Figure 1 and Figure 16 shown in the figures, the wearable device 100 further includes a conductive elastic sheet T1 disposed on the main board 2. The conductive elastic sheet T1 is electrically connected to the feed 6, and both ends of the second electrical connector J2 are respectively electrically connected to the conductive elastic sheet T1 and the feeding area Q2 of the planar antenna radiator 5, so as to realize the electrical connection between the feed 6 and the feeding area Q2. Among them, by adding the electrical connection between the conductive elastic sheet T1 and the second electrical connector J2, it is convenient to connect by welding or the like to increase the connection stability, and the feed 6 will not be damaged. The conductive elastic sheet T1 and the feed 6 also located on the main board 2 can be electrically connected through the wiring on the main board 2, and the connection on the same main board 2 also ensures the connection stability.

[0113] Among them, when the wearable device 100 further includes the matching unit M1, the matching unit M1 is also disposed on the main board 2. The conductive elastic sheet T1 is electrically connected to the feed 6 through the matching unit M1, that is, the matching unit M1 is connected between the feed 6 and the conductive elastic sheet T1.

[0114] Among them, other functional devices such as a processor, a memory, etc. are also installed on the main board 2. Since they are not related to the improvement of the present invention, they will not be elaborated.

[0115] Please refer to Figure 17 , which is another side view of the wearable device 100 in some embodiments of the present application. Among them, as Figure 17 shown, the wearable device 100 further includes a sub-board (sub-circuit board) 9, and the planar antenna radiator 5 is a metal layer in the sub-board 9.

[0116] That is, in some embodiments, the wearable device 100 further includes a secondary board 9, and the planar antenna radiator 5 can be a metal layer in the secondary board 9. Thus, by multiplexing the metal layer in the secondary board 9 as the planar antenna radiator 5, there is no need to separately provide the planar antenna radiator 5, saving cost and space, which is beneficial to the miniaturization of the wearable device 100.

[0117] Among them, as Figure 17 shown, a functional device 91 is also installed on the secondary board 9 to implement corresponding functions. For example, the functional device 91 can be a memory, a sensor, etc.

[0118] In some embodiments, the planar antenna radiator 5 can be all or part of the area of the metal layer in the secondary board 9.

[0119] That is, in some embodiments, the planar antenna radiator 5 can specifically be the entire metal layer in the secondary board 9, or a partial area isolated from the metal layer in the secondary board 9 by a gap.

[0120] Thus, in some embodiments, the size of the metal layer of the secondary board 9 can meet the size requirements of a preset frequency band. Thus, the entire metal layer in the secondary board 9 can be used as the planar antenna radiator 5. Or, the planar antenna radiator 5 can also be a partial area isolated from the metal layer of the secondary board 9 by a gap. Thus, an area with a corresponding size can be isolated more accurately according to 1 / 4 of the wavelength corresponding to the preset frequency band. Or, as described above, when the wearable device 100 further includes the matching unit M1, an area with a corresponding size is isolated according to the planar antenna radiator 5 satisfying an equivalent electrical length of λ / 4 under the matching adjustment of the matching unit M1. Or, when the entire metal layer in the secondary board 9 is used as the planar antenna radiator 5, regardless of whether the size of the entire metal layer meets 1 / 4 of the wavelength corresponding to the preset frequency band, the matching unit M1 can be used for matching adjustment, and finally the planar antenna radiator 5 satisfies an equivalent electrical length of λ / 4 under the matching adjustment of the matching unit M1.

[0121] In some embodiments, when the planar antenna radiator 5 can be all or part of the area of the metal layer in the secondary board 9, and the metal layer is a non-surface layer of the secondary board 9, the aforementioned first electrical connector J1 and second electrical connector J2 can pass through other layers of the secondary board 9 and be electrically connected to the metal layer serving as the planar antenna radiator 5.

[0122] Among them, in some embodiments, as Figure 17As shown, the auxiliary board 9 can be carried on the inner surface 71 of the rear cover 7, or the auxiliary board 9 can also be disposed on the side of the metal sheet 4 away from the battery 3 through an insulating member.

[0123] For example, in some embodiments, the auxiliary board 9 can be disposed on the inner surface 71 of the rear cover 7 so as to be fixed in the wearable device 100. Alternatively, in some embodiments, the auxiliary board 9 is disposed on the side of the metal sheet 4 away from the battery 3 through an insulating member, and is fixed in the wearable device 100, and at least through the insulating member, the metal layer serving as the planar antenna radiator 5 is spaced apart from the metal sheet 4.

[0124] Wherein, Figure 13 The case where the auxiliary board 9 is disposed on the inner surface 71 of the rear cover 7 is schematically shown as an example.

[0125] Wherein, when the auxiliary board 9 is disposed on the inner surface 71 of the rear cover 7, the auxiliary board 9 can be fixed on the inner surface 71 of the rear cover 7 by means of adhesion, clamping, etc.

[0126] In some embodiments, when the auxiliary board 9 is disposed on the side of the metal sheet 4 away from the battery 3 through an insulating member, the insulating member can be an insulating substrate, and the insulating substrate is fixedly connected to the metal sheet 4 and the auxiliary board 9 respectively by means of adhesion, clamping, etc., so that the auxiliary board 9 is fixed to the insulating substrate and is fixed to the metal sheet 4 through the insulating substrate.

[0127] In some embodiments, the insulating member can also be an insulating adhesive layer, and the auxiliary board 9 is bonded to the surface of the metal sheet 4 away from the battery 3 through the insulating member.

[0128] In some embodiments, the orthographic projection of the battery 3 on the metal sheet 4 is located within the metal sheet 4. That is, in some embodiments, the metal sheet 4 completely covers the surface of the battery 3 away from the main board 2. Thus, by completely covering the battery 3 with the metal sheet 4, the absorption of the antenna near-field energy by the battery 3 can be reduced or avoided, and the radiation performance of the electromagnetic wave signal in the preset frequency band can be prevented from being affected. As described above, due to the function of the metal sheet 4, the electric field direction generated by the planar antenna radiator 5 pointing to the side of the planar antenna radiator 5 facing the metal sheet 4 will be blocked by the metal sheet 4 and be constrained between the planar antenna radiator 5 and the metal sheet 4. And the electric field energy generated by the planar antenna radiator 5 is the antenna near-field energy. Thus, by means of the metal sheet 4, the absorption of the antenna near-field energy by the battery 3 can be reduced or avoided, and the radiation performance of the electromagnetic wave signal in the preset frequency band can be prevented from being affected.

[0129] In some embodiments, the orthographic projection of the battery 3 on the metal sheet 4 may completely coincide with the metal sheet 4, that is, the shape and size of the surface with the largest area of the battery 3 are equal to those of the surface with the largest area of the metal sheet 4, thereby reducing the space occupied by the metal sheet 4 in the wearable device 100.

[0130] In some embodiments, the surface with the largest area of the battery 3 may also be smaller than the surface with the largest area of the metal sheet 4. The region of the metal sheet 4 near the edge extends to the side of the battery 3 and wraps at least part of the side region of the battery 3, thereby further enhancing the isolation between the battery 3 and the planar antenna radiator 5 and further reducing the absorption of the antenna near-field energy by the battery 3.

[0131] In some embodiments, as described above, the preset frequency band may be the GPS frequency band, such as the GPS L1 frequency band, the GPS L5 frequency band, etc., so that the wearable device 100 can provide a GPS positioning function. As described above, the preset frequency band may also be the Bluetooth frequency band, or the 4G frequency band or the 5G frequency band such as N78, so that the wearable device 100 can provide a Bluetooth communication function or a cellular network communication function. The preset frequency band may also be any other frequency band or may include multiple frequency bands.

[0132] Please refer to Figure 18 , which is the antenna pattern obtained by simulation testing when the wearable device 100 in some embodiments of the present application is in a worn state.

[0133] Among them, Figure 18 The middle one is the antenna pattern obtained by simulation testing with the wearable device 100 worn on the human arm, and taking the left arm as an example. Among them, Figure 18 The darkest part in the antenna pattern shown in the middle is the antenna radiation direction with relatively large radiation energy. Figure 18 In the middle, the extension direction of the human arm is the x-axis direction, and the direction pointing to the palm is the positive x-axis direction. In addition, the direction parallel to the surface of the wearable device 100 and perpendicular to the x-axis direction is the y-axis direction, and the side away from the human body is the positive y-axis direction. Thus, from Figure 18 it can be seen that the three directions of the positive x-axis direction, the negative x-axis direction, and the negative y-axis direction are the antenna radiation directions R1 with relatively large radiation energy.

[0134] When the user wearing the wearable device 100 walks, the arm generally hangs down. Thus, the negative x-axis direction will face upward. Therefore, when the preset frequency band is the GPS frequency band, the requirement that the antenna radiation direction faces upward towards the GPS satellites located above is satisfied. When the user wearing the wearable device 100 is sitting, generally the negative y-axis direction or the positive x-axis direction will tend to face upward. Thus, it still ensures that at least one antenna radiation direction R1 with relatively large radiation energy generally faces upward, and the quality of GPS communication can be ensured.

[0135] In this application, the schematic diagrams of the radiation efficiency and the total system efficiency curves obtained by simulating and testing the wearable device 100, as well as the antenna pattern, etc., can be obtained by simulating and testing the wearable device 100 in any of the foregoing embodiments.

[0136] The wearable device 100 can be a wearable device such as a watch, a bracelet, and glasses with communication functions.

[0137] The wearable device 100 may further include other structures, which are not described herein in detail because they are not related to the improvements of this application.

[0138] In the wearable device 100 of this application, a planar antenna radiator 5 is adopted. Since the display screen 1, the main board 2, and the battery 3 are stacked in sequence, and the planar antenna radiator 5 is disposed on the side of the metal sheet 4 away from the battery 3, the planar antenna radiator 5 is located on the side of the wearable device 100 away from the display screen 1, that is, generally on the side of the back of the wearable device 100. Since an electric field is generated when the planar antenna radiator 5 operates in the preset frequency band, the electric field direction of the electric field includes an electric field direction perpendicular to the planar antenna radiator 5 and pointing to the side of the planar antenna radiator 5 away from the metal sheet 4. When the wearable device 100 is worn on the human body, at least part of the electric field direction in the electric field generated by the planar antenna radiator will point to the human body part. Therefore, at least part of the electric field with the electric field direction pointing to the human body part can stimulate the human body part to radiate, thereby effectively improving the radiation performance.

[0139] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0140] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered by the protection scope of the present application; without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A wearable device, characterized in that, Comprising: A display screen, a main board, and a battery stacked in sequence; A metal sheet stacked on a side of the battery facing away from the main board for grounding; A planar antenna radiator disposed on a side of the metal sheet facing away from the battery and spaced and parallel to the metal sheet. Wherein, the planar antenna radiator includes a grounding area and a feeding area, and the grounding area is electrically connected to the metal sheet; A feeder electrically connected to the feeding area of the planar antenna radiator for exciting the planar antenna radiator to operate in a preset frequency band. Wherein, when the planar antenna radiator operates in the preset frequency band, a corresponding electric field is generated, and the electric field direction of the electric field includes an electric field direction perpendicular to the planar antenna radiator and pointing to a side of the planar antenna radiator facing away from the metal sheet.

2. The wearable device according to claim 1, characterized in that, The planar antenna radiator is a PIFA antenna, the planar antenna radiator is square, including two opposite first sides and two opposite second sides. The grounding area is disposed at a position close to one of the first sides, and the feeding area is generally disposed between the grounding area and the other first side.

3. The wearable device according to claim 2, characterized in that, The electrical length of the second side of the planar antenna radiator is λ / 4, where λ is the wavelength corresponding to the preset frequency band.

4. The wearable device according to claim 1, characterized in that, The wearable device further includes a rear cover and a frame. The rear cover and the frame cooperate with the display screen to form a receiving space. The main board, the battery, the metal sheet, the planar antenna radiator, and the feeder are disposed in the receiving space, and the planar antenna radiator is disposed adjacent to the rear cover.

5. The wearable device according to claim 4, characterized in that, The planar antenna radiator is disposed on the inner surface of the rear cover, or the planar antenna radiator is disposed on a side of the metal sheet facing away from the battery through an insulating member and spaced from the metal sheet through the insulating member.

6. The wearable device according to claim 4, characterized in that, The rear cover is made of an insulating material.

7. The wearable device according to claim 1, characterized in that, The grounding area is electrically connected to the metal sheet through a first electrical connector.

8. The wearable device according to claim 7, characterized in that, The first electrical connector is a flexible circuit board, a transmission wire, or a conductive elastic sheet.

9. The wearable device according to claim 1, characterized in that, The feeder is electrically connected to the feeding area through a second electrical connector.

10. The wearable device according to claim 9, characterized in that, The second electrical connector is a flexible circuit board, a transmission wire, or a conductive elastic sheet.

11. For the wearable device according to claim 9, the feed is arranged on the main board, one end of the second electrical connector is electrically connected to the feed, and the other end extends through the battery and the metal sheet and then is electrically connected to the feeding area.

12. The wearable device according to claim 9, characterized in that, The wearable device further includes a matching unit connected between the feeder and the second electrical connector for impedance matching.

13. The wearable device according to claim 1, characterized in that, The wearable device further includes a secondary board, and the planar antenna radiator is a metal layer in the secondary board.

14. The wearable device according to claim 13, characterized in that, The planar antenna radiator is all or part of the area of the metal layer in the secondary board.

15. The wearable device according to claim 13, characterized in that, The wearable device includes a rear cover. The secondary board is carried on the inner surface of the rear cover, or the secondary board is disposed on a side of the metal sheet facing away from the battery through an insulating member.

16. The wearable device according to claim 1, characterized in that, The orthographic projection of the battery on the metal sheet is located within the metal sheet.

17. The wearable device according to any one of claims 1-16, characterized in that, The preset frequency band is the GPS frequency band.

18. The wearable device according to any one of claims 1-16, characterized in that The wearable device is a watch, a bracelet, or glasses with communication functions.

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