Wireless communication device

Abstract

The utility model provides wireless communication equipment which comprises an equipment body, a bin cover and an antenna assembly, the equipment body is provided with a metal shell, the metal shell is provided with an inner cavity, a mainboard is arranged in the inner cavity, the surface of the metal shell is provided with a battery bin suitable for containing a battery, the inner cavity is provided with an opening, and the opening is located in the battery bin; the bin cover is made of a low-dielectric-constant material, and the bin cover is detachably arranged on the metal shell so as to open and close the battery bin; the antenna assembly comprises a feed part and a radiator, the feed part is arranged on the side, facing the inner cavity, of the opening, the feed part is electrically connected with the mainboard, the radiator is arranged on the bin cover, and the feed part is in coupled connection with the radiator. The wireless communication equipment provided by the utility model has the advantage of relatively high antenna communication efficiency.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of intelligent lock, more particularly, relates to a wireless communication device. BACKGROUND

[0002] The wireless communication device such as intelligent door lock and wireless doorbell contains high conductivity structures such as driving member, battery, loudspeaker and mainboard PCB inside, and the layout space left for the antenna is very limited and the working environment of the antenna is complex, which is affected by the high conductivity structures and metal shell inside the door lock, and the antenna radiation performance of the wireless communication device in the related technology is poor. CONTENT OF THE UTILITY MODEL

[0003] The purpose of the embodiment of the application is to provide a wireless communication device to solve the technical problem of poor antenna radiation performance of the wireless communication device in the related technology.

[0004] The wireless communication device provided by the embodiment of the application comprises a device main body, the device main body is provided with a metal shell, the metal shell is provided with a battery compartment suitable for accommodating a battery, the metal shell has an inner cavity and the inner cavity has an opening, and the opening is located in the battery compartment; a compartment cover, the dielectric constant of the material of the compartment cover is less than or equal to 3, the compartment cover is arranged at the opening of the battery compartment and can be detachably connected with the metal shell; an antenna assembly, the antenna assembly comprises a feed part and a radiator, the feed part is arranged on the side of the opening facing the inner cavity, and the radiator is arranged on the compartment cover, and the feed part is coupled with the radiator.

[0005] The wireless communication device provided by the embodiment of the application has the advantages that compared with the prior art, the metal shell of the wireless communication device provided by the embodiment of the application is provided with an opening in the battery compartment, the feed part at the opening is coupled with the radiator arranged in the compartment cover of the battery compartment for feed, and through the coupling feed mode of the feed part and the radiator, the compartment cover can be detached from the device main body without affecting the compartment cover, and the metal shell can also avoid shielding the electromagnetic waves emitted or received by the radiator, so that the wireless communication device provided by the embodiment of the application has the advantage of high antenna communication efficiency.

[0006] Optionally, the feed part comprises a feed branch and a grounding part, the inside of the grounding part is provided with a gap, the grounding part is located between the radiator and the feed branch, and the gap is located between the radiator and the feed branch, so that the feed branch couples with the radiator through the gap.

[0007] Optionally, the feed branch extends along a first direction, the slot comprises a first slot extending along the first direction and a second slot extending along a second direction, the second direction being orthogonal to the first direction, the first slot coincides with at least part of the feed branch along a third direction in the projection of the radiator, the third direction being orthogonal to the first direction and the third direction being orthogonal to the second direction.

[0008] Optionally, a projection of the second slot on the radiator along the third direction is located at an end of the radiator along the first direction.

[0009] Optionally, the second slot has a first end and a second end in the second direction, the radiator is located between the first end and the second end.

[0010] Optionally, the radiator comprises a first patch and a second patch, the first patch is located at one side of the second patch along the first direction, the feed part is coupled to an end of the first patch away from the second patch.

[0011] Optionally, a dimension of the first patch along the first direction is a half wavelength of an electrical signal in the feed part, a dimension of the second patch along the first direction is a half wavelength of the electrical signal in the feed part, and a half-wave device is arranged between the first patch and the second patch to make the electrical signal conducted from the first patch to the second patch have the same phase as the electrical signal conducted from the feed part to the first patch.

[0012] Optionally, a battery is detachably arranged in the battery compartment, and a projection of the battery on the cover is arranged staggered with a projection of the opening on the cover.

[0013] Optionally, the wireless communication device further comprises a cover plate, a dielectric constant of a material of the cover plate is less than or equal to 3, a projection of the opening on a third direction is located inside a projection of the cover plate on the third direction, and the cover plate is arranged on a side of the opening facing the cover and detachably connected with the metal shell.

[0014] Optionally, the wireless communication device is a wireless door lock or a wireless doorbell. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0016] Figure 1 An exploded structural schematic diagram of a wireless communication device provided by an embodiment of the present application;

[0017] Figure 2 An exploded structural schematic diagram of a wireless communication device provided by an embodiment of the present application; Figure 1 A sectional view schematic diagram of A-A in the above;

[0018] Figure 3 A sectional view schematic diagram of B in the above; Figure 2 A sectional view schematic diagram of B in the above;

[0019] Figure 4 A schematic diagram of a battery and an opening of a wireless communication device provided by an embodiment of the present application;

[0020] Figure 5 A schematic diagram of an antenna assembly of a wireless communication device provided by an embodiment of the present application;

[0021] Figure 6 A schematic diagram of a feeding portion wiring of a wireless communication device provided by an embodiment of the present application;

[0022] Figure 7 A standing wave schematic diagram of an antenna assembly of a wireless communication device provided by an embodiment of the present application;

[0023] Figure 8 A radiation pattern of an antenna assembly of a wireless communication device provided by an embodiment of the present application;

[0024] Figure 9 A schematic diagram of an antenna assembly of a wireless communication device provided by another embodiment of the present application;

[0025] Figure 10 A radiation pattern of an antenna assembly of a wireless communication device provided by another embodiment of the present application.

[0026] In the drawings, various reference numerals are used to refer to the same or similar items throughout the drawings.

[0027] 100, a wireless communication device;

[0028] 10, a device main body; 11, a metal shell; 101, a front shell; 102, a rear shell; 111, a battery compartment; 112, an opening; 12, a main board; 13, a motor; 14, a lock core;

[0029] 20, a compartment cover;

[0030] 30, an antenna assembly; 31, a radiator; 311, a first patch; 312, a second patch; 313, a half-wave device; 32, a feeding portion; 321, a feeding branch; 322, a grounding portion; 323, a dielectric substrate; 324, a slot; 3241, a first slot; 3242, a second slot; 325, a wire; 33, a cover plate;

[0031] 40. The battery. DETAILED DESCRIPTION

[0032] In order to make the technical problems to be solved, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0033] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0034] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0035] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0036] The wireless communication device 100 provided by the present application can be any one of a smart door lock, a wireless doorbell and the like.

[0037] Please refer to Figures 1 to 5 , the wireless communication device 100 provided by the embodiment of the present application will be described.

[0038] The wireless communication device 100 provided by the embodiment of the present application comprises a device main body 10, a bin cover 20 and an antenna assembly 30.

[0039] It should be noted that the first direction in the following is the z direction shown in Figures 1 to 5 , the second direction in the following is the y direction shown in Figures 1 to 5 , and the third direction in the following is the x direction shown in Figures 1 to 5 .

[0040] The device body 10 is provided with a metal shell 11 having an inner cavity, wherein a main board 12 is arranged in the inner cavity. The surface of the metal shell 11 is provided with a battery compartment 111 adapted to accommodate a battery 40. The metal shell 11 has an opening 112 located in the battery compartment 111.

[0041] As shown in Figure 1 , the main board 12 is electrically connected with the antenna assembly 30, so that the main board 12 can transmit or receive electric signals through the antenna assembly 30. The opening 112 is arranged on one side of the metal shell 11 along the third direction x and penetrates the metal shell 11. The electric signals generated by the main board 12 can be conducted from the opening 112 to the metal shell 11, so as to avoid the shielding of the metal shell 11 to the wireless communication electric signals generated by the main board 12.

[0042] The metal shell 11 has a recessed portion on one side along the third direction x, and the battery compartment 111 is formed in the recessed portion. The device body 10 further comprises a power supply assembly. In some embodiments, one or more batteries 40 are detachably arranged in the battery compartment 111. At least part of the power supply assembly extends into the battery compartment 111 and is adapted to be connected with the battery 40 in the battery compartment 111. The opening 112 is arranged in the battery compartment 111.

[0043] The compartment cover 20 is made of a material with low dielectric constant. The compartment cover 20 is detachably arranged on the metal shell 11 to open and close the battery compartment 111.

[0044] As shown in Figure 1 and Figure 2 , the compartment cover 20 is located on one side of the battery compartment 111 along the third direction x. The compartment cover 20 extends along the yOz plane in the drawing and is detachably arranged at the opening of the battery compartment 111 along the third direction x. The compartment cover 20 can be made of polytetrafluoroethylene, polypropylene, polystyrene or other materials with a dielectric constant less than or equal to 3. When the compartment cover 20 is assembled at the opening of the battery compartment 111, on the one hand, the battery compartment 111 can be closed by the compartment cover 20, and on the other hand, the electromagnetic waves inside the battery compartment 111 can be radiated to the outside of the compartment cover 20 through the compartment cover 20.

[0045] The antenna assembly 30 comprises a feeding portion 32 and a radiator 31. The feeding portion 32 is arranged on the side of the opening 112 facing the inner cavity, and the radiator 31 is arranged on the compartment cover 20. The feeding portion 32 is coupled with the radiator 31.

[0046] As shown in Figure 3 , the feeding portion 32 and the radiator 31 are both conductor materials through which electric signals can be transmitted. The feeding portion 32 is arranged on the inner side of the opening 112 and can be electrically connected with the main board 12, so that the main board 12 inputs electric signals into the feeding portion 32. The radiator 31 is arranged on the compartment cover 20 and extends along the yOz plane in the drawing. Figures 1 to 5The radiator 31 and the feeding portion 32 are arranged along a third direction x, and the feeding portion 32 is coupled to the radiator 31 when the cover 20 is assembled at the opening of the battery compartment 111, so that an electrical signal in the mainboard 12 is input into the radiator 31 through the feeding portion 32 in a coupled feeding mode, and the radiator 31 is excited to generate electromagnetic waves, and the electromagnetic waves generated by the radiator 31 can be radiated outward through the cover 20, so that the wireless communication function of the mainboard 12 is realized through the antenna assembly 30.

[0047] The wireless communication device 100 provided by the embodiments of the present application has the beneficial effect that, compared with the prior art, the metal shell 11 of the wireless communication device 100 provided by the embodiments of the present application is provided with the opening 112 in the battery compartment 111, the feeding portion 32 at the opening 112 is coupled to the radiator 31 arranged in the cover 20 of the battery compartment 111, and the coupled feeding mode of the feeding portion 32 and the radiator 31 can avoid the shielding of the electromagnetic waves emitted or received by the radiator 31 by the metal shell 11 without affecting the disassembly of the cover 20 from the device main body 10, so that the wireless communication device 100 provided by the embodiments of the present application has the advantage of high antenna communication efficiency.

[0048] In some embodiments provided by the present application, as shown in Figure 1 and Figure 2 The metal shell 11 includes a front shell 101 and a rear shell 102, the front shell 101 and the rear shell 102 are arranged opposite along the third direction x, the rear shell 102 is provided with a handle, the front shell 101 and the rear shell 102 are spliced to form the metal shell 11, the front shell 101 and the rear shell 102 are both metal materials, an inner cavity of the metal shell 11 is formed between the front shell 101 and the rear shell 102, and the battery compartment 111 is arranged on a side of the rear shell 102 away from the front shell 101.

[0049] In some embodiments provided by the present application, the feeding portion 32 includes a feeding branch 321 and a grounding portion 322, the inside of the grounding portion 322 is provided with a gap 324, the grounding portion 322 is located between the radiator 31 and the feeding branch 321, and the gap 324 is located between the radiator 31 and the feeding branch 321, so that the feeding branch 321 couples to the radiator 31 through the gap 324.

[0050] As shown in Figure 3 and Figure 5 The feeding branch 321 and the grounding portion 322 are both conductor materials, the grounding portion 322 is located in the opening 112, the feeding portion 32 is located on a side of the opening 112 facing the inner cavity, and the grounding portion 322 and the feeding portion 32 are arranged apart along the third direction x, the feeding portion 32 includes a dielectric substrate 323, the dielectric substrate 323 is arranged along the third direction x, and the feeding branch 321 is arranged on a side of the dielectric substrate 323 facing the opening 112. Figure 3 Figure 5 ​The medium substrate 323 extends along a yOz plane, and includes a first surface and a second surface which are spaced apart and parallel to each other, the first surface is located on a side of the medium substrate 323 facing the radiator 31, and the second surface is located on a side of the medium substrate 323 away from the radiator 31, the grounding part 322 is arranged on the first surface, and the feeding branch 321 is arranged on the second surface.

[0051] The gap 324 is arranged in the grounding part 322, so that the feeding branch 321 and the radiator 31 are coupled through the gap, and the gap coupling feeding technology can realize wideband performance and is suitable for communication requirements of different frequency bands. By adjusting the size and position of the gap 324, the matching of the antenna standing wave ratio and the bandwidth of different frequency bands can be realized, so as to meet the requirements of various communication standards.

[0052] In some embodiments provided in the present application, the feeding branch 321 extends along a first direction z, the gap 324 includes a first gap 3241 extending along the first direction z and a second gap 3242 extending along a second direction y, the second direction y is orthogonal to the first direction z, and at least part of the projection of the feeding branch 321 in a third direction x coincides with the projection of the first gap 3241 in the third direction x, the third direction x is orthogonal to the first direction z and the third direction x is orthogonal to the second direction y.

[0053] As shown in Figure 6 , one end of the feeding branch 321 along the first direction z is electrically connected to the main board 12, the feeding branch 321 and the first gap 3241 are arranged in overlap along the third direction x, and the second gap 3242 and the first gap 3241 combine to form a T-shaped gap 324, so that a T-shaped gap coupling feeding structure is formed between the feeding branch 321 and the radiator 31.

[0054] Therefore, by forming the T-shaped gap coupling feeding structure between the feeding branch 321 and the radiator 31, the T-shaped gap coupling feeding structure adjusts the input impedance of the antenna assembly 30, and it is easy to realize the impedance matching between the radiator 31 and the feeding branch 321, so as to optimize the standing wave of the antenna assembly 30, as shown in Figure 7 , the Smith chart of the antenna assembly 30 in the 2.4-2.5GHz frequency band converges, which is convenient for adjusting the standing wave by using a matching network to minimize reflection and improve the transmission efficiency of the signal, so that the standing wave of the antenna assembly 30 in the 2.4-2.5GHz frequency band is less than-10dB.

[0055] Therefore, by forming the T-shaped gap coupling feeding structure between the feeding branch 321 and the radiator 31, the radiation efficiency of the antenna assembly 30 is improved, and thus the wireless communication device 100 provided in the present application has the advantage of high communication efficiency.

[0056] In some embodiments provided by the present application, the projection of the second gap 3242 on the radiator 31 along the third direction x is located at the end of the radiator 31 along the first direction z.

[0057] As shown in Figure 5 , the second gap 3242 and the first gap 3241 are both arranged at the end of the radiator 31 along the second direction y, so that the feed part 32 generates TM01 mode resonance in the radiator 31, that is, the current in the radiator 31 conducts along the second direction y, and the radiation pattern of the antenna assembly 30 is as shown in 01 , the solid line in Figure 8 , Figure 8 is the radiation pattern of the antenna assembly 30 in the xOy plane near the frequency point of 2.45 GHz, Figure 8 , the dashed line in Figure 8 is the radiation pattern of the antenna assembly 30 in the xOz plane near the frequency point of 2.45 GHz, and it can be concluded from

[0058] , that the maximum gain of the antenna assembly 30 reaches 5.1 dBi and has a high front-to-back ratio.

[0059] In some embodiments provided by the present application, the radiator 31 includes a first patch 311 and a second patch 312, the first patch 311 is located on one side of the second patch 312 along the first direction z, and the feed part 32 is coupled to the end of the first patch 311 away from the second patch 312.

[0060] As shown in Figure 9 , the first patch 311 and the second patch 312 combine to form a binary array arranged along the first direction z, and the feed part 32 is coupled to the first patch 311 to input an electrical signal from the end of the first patch 311 away from the second patch 312 into the first patch 311, the electrical signal conducts in the first patch 311 along the first direction z towards the second patch 312, and is transmitted from the end of the second patch 312 along the first direction z, thereby generating TM01 mode resonance in both the first patch 311 and the second patch 312. 01

[0061] In some embodiments provided by the present application, the size of the first patch 311 along the first direction z is half the wavelength of the electrical signal in the feed part 32, the size of the second patch 312 along the first direction z is half the wavelength of the electrical signal in the feed part 32, and a half-wave device 313 is arranged between the first patch 311 and the second patch 312 to make the phase of the electrical signal conducted from the first patch 311 to the second patch 312 the same as that of the electrical signal conducted from the feed part 32 to the first patch 311.

[0062] ​Thus, the feeding portion 32 inputs an electrical signal from the end of the first patch 311 along the first direction z, the electrical signal is conducted from the end of the first patch 311 along the first direction z away from the second patch 312 to the end of the first patch 311 along the first direction z close to the second patch 312, the path length of the electrical signal conducted in the first patch 311 is half of the wavelength of the electrical signal, the electrical signal at the end of the first patch 311 close to the second patch 312 is input to the end of the second patch 312 close to the first patch 311 through the half-wave device 313, and the path length of the electrical signal in the half-wave device 313 is half of the wavelength of the electrical signal, so that the electrical signal input by the feeding portion 32 to the first patch 311 has the same phase as the electrical signal input by the first patch 311 to the second patch 312, and the first patch 311 and the second patch 312 radiate in the same direction to increase the gain of the wireless communication device 100 provided in the present application, as shown in Figure 10 The maximum gain of the antenna assembly 30 of the wireless communication device 100 reaches 6.7dBi.

[0063] In some embodiments provided in the present application, the second gap 3242 has a first end and a second end along the second direction y, and the radiator 31 is located between the first end and the second end.

[0064] As shown in Figure 5 and Figure 6 , the radiator 31 is completely located between the first end and the second end, so that the current intensity in the radiator 31 is uniformly distributed along the second direction y, on the one hand, the electromagnetic wave can be radiated more effectively, thereby improving the radiation efficiency of the antenna assembly 30. This means that under the same input power, the antenna assembly 30 can produce a stronger radiation field, thereby improving the communication quality or signal coverage range of the wireless communication device 100 provided in the present application; on the other hand, uneven distribution of current in the radiator 31 can cause energy loss inside the radiator 31, such as local overheating, resistance loss, etc. Uniform distribution of current in the radiator 31 helps to reduce these energy losses, so that the antenna can work more efficiently, further improving the communication quality of the wireless communication device 100 provided in the present application.

[0065] In some embodiments provided in the present application, the battery 40 is detachably arranged in the battery compartment 111, and the orthographic projection of the battery 40 on the cover 20 is arranged staggered with the orthographic projection of the opening 112 on the cover 20.

[0066] As shown in Figure 4 , the battery 40 is arranged staggered with the opening 112 along the first direction z, so that the feeding portion 32 is arranged staggered with the battery 40 along the first direction z, on the one hand, to avoid the battery 40 affecting the coupling connection efficiency between the feeding portion 32 and the radiator 31, and on the other hand, to avoid the feeding portion 32 generating eddy current loss inside the battery 40, thereby reducing the influence between the antenna assembly 30 and the battery 40.

[0067] In some embodiments provided in this application, the wireless communication device 100 further includes a cover plate 33, the orthographic projection of the opening 112 in a third direction x is located inside the orthographic projection of the cover plate 33 in the third direction x, and the cover plate 33 is detachably disposed on the side of the opening 112 facing the compartment cover 20.

[0068] like Figure 1 As shown, the orthographic projection of the opening 112 in the third direction x is located inside the orthographic projection of the cover plate 33 in the third direction x. The cover plate 33 is detachably disposed on the side of the opening 112 facing the cover 20. The cover plate 33 is detachably connected to the metal housing 11 to close the opening 112. The material of the cover plate 33 is one or more of the following materials with a dielectric constant of less than or equal to 3, such as polytetrafluoroethylene, polypropylene, and polystyrene.

[0069] Therefore, on the one hand, the power supply section 32 inside the opening 112 can be protected by the cover plate 33, and on the other hand, the cover plate 33 is made of a material with a low dielectric constant, which reduces the impact of the cover plate 33 on the coupling connection efficiency between the power supply section 32 and the radiator 31, thereby improving the communication efficiency of the wireless communication device 100 provided in this application.

[0070] In some embodiments provided in this application, such as Figure 1 As shown, the wireless communication device 100 can be a smart door lock. The main body 10 of the device includes a lock cylinder 14 and a motor 13 housed in a metal casing 11. The motor 13 is electrically connected to the main board 12 and the lock cylinder 14, so that the main board 12 can control the opening and closing of the lock cylinder 14 through the motor 13.

[0071] Therefore, on the one hand, the smart door lock adopts a metal shell 11, which has high security and appearance. On the other hand, since the smart door lock uses the radiator 31 provided in this application located inside the cover 20, and the radiator 31 is coupled and connected to the power supply unit 32, the smart door lock has high communication efficiency.

[0072] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A wireless communication device, comprising: The application relates to a wireless communication device, comprising: a device body provided with a metal shell having an inner cavity, a mainboard arranged in the inner cavity, a battery compartment on the surface of the metal shell for accommodating a battery, and an opening in the inner cavity and located in the battery compartment; a cover made of a material with a dielectric constant less than or equal to 3, arranged at the opening of the battery compartment and detachably connected with the metal shell; an antenna assembly comprising a feeding portion and a radiating body, the feeding portion being arranged on the side of the opening facing the inner cavity and electrically connected with the mainboard, and the radiating body being arranged on the cover and coupled with the feeding portion.

2. The wireless communication device of claim 1, wherein: The feeding portion comprises a feeding branch and a grounding portion, the inner part of the grounding portion is provided with a gap, the grounding portion is located between the radiating body and the feeding branch, and the gap is located between the radiating body and the feeding branch, so that the feeding branch couples with the radiating body through the gap.

3. The wireless communication device of claim 2, wherein: The feeding branch extends along a first direction, the gap comprises a first gap extending along the first direction and a second gap extending along a second direction, the second direction is orthogonal to the first direction, the first gap overlaps at least part of the projection of the feeding branch on the radiating body along a third direction, the third direction is orthogonal to the first direction and the second direction.

4. The wireless communication device of claim 3, wherein: The projection of the second gap on the radiating body along the third direction is located at the end of the radiating body along the first direction.

5. The wireless communication device of claim 3, wherein: The second gap has a first end and a second end in the second direction, and the radiating body is located between the first end and the second end.

6. The wireless communication device of claim 3, wherein: The radiating body comprises a first patch and a second patch, the first patch is located on the side of the second patch along the first direction, and the feeding portion is coupled with the end of the first patch away from the second patch.

7. The wireless communication device of claim 6, wherein: The size of the first patch in the first direction is half the wavelength of the electrical signal in the feeding portion, the size of the second patch in the first direction is half the wavelength of the electrical signal in the feeding portion, and a half-wave device is arranged between the first patch and the second patch, so that the electrical signal conducted from the first patch to the second patch has the same phase as the electrical signal conducted from the feeding portion to the first patch.

8. The wireless communication device of claim 1, wherein: A battery is detachably arranged in the battery compartment, and the projection of the battery on the cover is staggered with the projection of the opening on the cover.

9. The wireless communication device of claim 1, wherein: The wireless communication device further comprises a cover plate made of a material with a dielectric constant less than or equal to 3, the projection of the opening on the cover plate in the third direction is located on the inner side of the projection of the cover plate on the third direction, and the cover plate is arranged on the side of the opening facing the cover and detachably connected with the metal shell.

10. The wireless communication device of any one of claims 1-9, wherein: The wireless communication device is a wireless door lock or a wireless doorbell.

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