Antenna structure and digital key

Abstract

The utility model provides an antenna structure and a digital key. The antenna structure comprises a dielectric plate, a UWB transmitting antenna, a first metal grounding plate, a BLE antenna, a quarter wavelength director and a second metal grounding plate. The UWB transmitting antenna and the first metal grounding plate are arranged on the upper surface of the dielectric plate, and the BLE antenna, the quarter-wavelength director and the second metal grounding plate are arranged on the lower surface of the dielectric plate; the UWB transmitting antenna is of an elliptical planar monopole structure, the BLE antenna is of a planar inverted F-shaped structure, the BLE antenna and the quarter-wavelength director are connected with the second metal grounding plate, and the BLE antenna and the quarter-wavelength director are arranged on the two sides of the UWB transmitting antenna respectively. According to the utility model, the performance of the antenna under various environmental conditions can be enhanced, so that the radiation intensity of the antenna in each direction is more uniform.

Description

Technical Field

[0001] The utility model relates to the technical field of wireless communication, and particularly relates to an antenna structure and a digital key. Background Art

[0002] In the current digital key system, especially in the system based on Bluetooth Low Energy (BLE) and Ultra-Wideband (UWB) technologies, antenna design is a key factor to ensure efficient, reliable and omnidirectional communication. However, the existing antenna designs often face various technical problems. First, the coupling problem of the antenna may cause signal interference and energy loss, thus affecting the unlocking and locking performance of the digital key, especially in the case of long distance or complex environmental conditions. Second, the irregular grounding design may lead to the non-uniformity of the antenna radiation pattern, generating directional blind spots, which may cause unstable unlocking and locking operations in actual use. Finally, due to the device size limitation and environmental impact, the antenna performance may be significantly degraded, affecting the signal coverage and ranging accuracy.

[0003] It should be noted that the information disclosed in the background art part of the present utility model is only intended to deepen the understanding of the general background art of the present utility model, and should not be regarded as an admission or any form of implication that this information constitutes the prior art known to those skilled in the art. Summary of the Utility Model

[0004] The purpose of the present utility model is to provide an antenna structure and a digital key, which can effectively enhance the performance of the antenna under various environmental conditions and make the radiation intensity of the antenna more uniform in all directions.

[0005] To achieve the above object, the present utility model provides an antenna structure, which includes a dielectric board, a UWB transmitting antenna, a first metal ground board, a BLE antenna, a quarter-wavelength director and a second metal ground board; the UWB transmitting antenna and the first metal ground board are both arranged on the upper surface of the dielectric board, and the BLE antenna, the quarter-wavelength director and the second metal ground board are all arranged on the lower surface of the dielectric board; the UWB transmitting antenna is an elliptical planar monopole structure, the BLE antenna is a planar inverted-F structure, the BLE antenna and the quarter-wavelength director are both connected to the second metal ground board, and the BLE antenna and the quarter-wavelength director are respectively arranged on both sides of the UWB transmitting antenna.

[0006] Optionally, the UWB transmitting antenna is located at the first end of the upper surface of the dielectric plate, the first metal ground plane extends to the second end of the upper surface of the dielectric plate, the BLE antenna and the quarter-wavelength director are located at the first end of the lower surface of the dielectric plate, and the second metal ground plane extends to the second end of the lower surface of the dielectric plate; the first end of the first metal ground plane is arranged to avoid the UWB transmitting antenna, so as to form a first windowing area around the UWB transmitting antenna at the first end of the upper surface of the dielectric plate, the first end of the second metal ground plane is arranged to avoid the BLE antenna, so as to form a second windowing area around the BLE antenna at the first end of the lower surface of the dielectric plate, and the first windowing area and the second windowing area are arranged in an up-and-down corresponding manner along the thickness direction of the dielectric plate to jointly form a first clearance area around the UWB transmitting antenna and the BLE antenna.

[0007] Optionally, the antenna structure further includes a first UWB receiving antenna and a second UWB receiving antenna, the first UWB receiving antenna is arranged on the upper surface of the dielectric plate, and the second UWB receiving antenna is arranged on the lower surface of the dielectric plate.

[0008] Optionally, the first UWB receiving antenna is arranged on the first side of the upper surface of the dielectric plate, and the second UWB receiving antenna is arranged on the second side of the lower surface of the dielectric plate.

[0009] Optionally, the first side of the first metal ground plane has a first notch recessed towards the direction of its second side for forming a second clearance area around the first UWB receiving antenna; the second side of the second metal ground plane has a second notch recessed towards the direction of its first side for forming a third clearance area around the second UWB receiving antenna.

[0010] Optionally, the opening side of the first notch has a first flared portion, and the inner diameter of the side of the first flared portion away from the first UWB receiving antenna is larger than the inner diameter of the side close to the first UWB receiving antenna; the opening side of the second notch has a second flared portion, and the inner diameter of the side of the second flared portion away from the second UWB receiving antenna is larger than the inner diameter of the side close to the second UWB receiving antenna.

[0011] Optionally, the second side of the first metal ground plate has a third notch recessed toward the direction where its first side is located. The third notch and the second notch are arranged vertically corresponding to each other along the thickness direction of the dielectric plate to jointly form the third clearance area. The first side of the second metal ground plate has a fourth notch recessed toward the direction where its second side is located. The fourth notch and the first notch are arranged vertically corresponding to each other along the thickness direction of the dielectric plate to jointly form the second clearance area.

[0012] Optionally, the opening side of the third notch has a third flared portion, and the inner diameter of the side of the third flared portion away from the second UWB receiving antenna is greater than the inner diameter of the side close to the second UWB receiving antenna. The opening side of the fourth notch has a fourth flared portion, and the inner diameter of the side of the fourth flared portion away from the first UWB receiving antenna is greater than the inner diameter of the side close to the first UWB receiving antenna.

[0013] Optionally, both corners on both sides of the end of the first metal ground plate close to the UWB transmitting antenna protrude toward the position where the UWB transmitting antenna is located to form a first protruding portion. Both corners on both sides of the end of the second metal ground plate close to the BLE antenna protrude toward the position where the BLE antenna is located to form a second protruding portion.

[0014] To achieve the above object, the present utility model further provides a digital key, and the digital key includes the antenna structure described in any one of the above.

[0015] Compared with the prior art, the antenna structure and the digital key provided by the present utility model have the following beneficial effects:

[0016] Since the UWB transmitting antenna operates in the frequency bands of CH9 (7.75 GHz to 8.25 GHz) and CH5 (6.25 GHz to 6.75 GHz), and the BLE antenna operating at 2.45 GHz has its second resonance frequency (actually slightly greater than 5 GHz) intersecting with the operating frequency bands of the UWB transmitting antenna. Therefore, the antenna structure provided by the present utility model integrates the UWB transmitting antenna with a small elliptical planar monopole structure and the BLE antenna with a planar inverted-F structure, so that the BLE antenna can, while meeting the requirements of Bluetooth broadband, realize the function of an auxiliary director for the UWB transmitting antenna, thereby enhancing the omnidirectional radiation performance of the UWB transmitting antenna in the CH9 and CH5 frequency bands. At the same time, by setting a quarter-wavelength director, the radiation performance and directivity of the UWB transmitting antenna and the BLE antenna can be further enhanced. Thus, it can be seen that the antenna structure provided by the present utility model can effectively enhance the performance of the UWB transmitting antenna and the BLE antenna under various environmental conditions, making the radiation intensity of the UWB transmitting antenna and the BLE antenna more uniform in all directions. When the antenna structure provided by the present utility model is applied to a digital key, it can not only effectively improve the sensitivity of the all-round unlocking of the digital key, but also take into account the Bluetooth function and the radar function, significantly enhancing the performance and practicality of the digital key.

[0017] Furthermore, by setting the UWB transmitting antenna and the BLE antenna of the antenna structure provided by the present utility model to share the same clearance area, the antenna layout can be made more compact. On the premise of maintaining a high level of performance of the UWB transmitting antenna and the BLE antenna, it helps to reduce the size of the antenna structure, lower the production cost, and thus is conducive to the miniaturization of the device applying the antenna structure provided by the present utility model, reducing the complexity of manufacturing and maintaining the device.

[0018] Furthermore, by setting first protrusions at the two side corners of the end of the first metal ground plane close to the UWB transmitting antenna, and second protrusions at the two side corners of the end of the second metal ground plane close to the BLE antenna, the isolation degree between the UWB transmitting antenna and the first UWB receiving antenna, and between the UWB transmitting antenna and the second UWB receiving antenna can be at least -20 dB, thereby effectively ensuring the accuracy and interference-free of the radar function of the antenna structure provided by the present utility model and meeting the strict requirements of the radar function.

[0019] Since the digital key provided by the present utility model has the antenna structure provided by the present utility model, the digital key provided by the present utility model has at least all the beneficial effects of the antenna structure provided by the present utility model. For specific details, reference can be made to the relevant descriptions of the beneficial effects of the antenna structure provided by the present utility model in the above text, so they will not be elaborated here one by one. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. 6 is a front structural schematic diagram of the antenna structure provided by an embodiment of the present utility model;

[0021] Figure 2 FIG. 10 is a back structural schematic diagram of the antenna structure provided by an embodiment of the present utility model;

[0022] Figure 3 FIG. 14 is an S-parameter schematic diagram of each antenna in the antenna structure provided by an embodiment of the present utility model;

[0023] Figure 4a FIG. 18 is a 3D radiation pattern of the UWB transmitting antenna at 6.5 GHz in the antenna structure integrating only the UWB antenna;

[0024] Figure 4b FIG. 22 is a 3D radiation pattern of the UWB transmitting antenna at 6.5 GHz in the antenna structure integrating the UWB antenna and the BLE antenna;

[0025] Figure 4c FIG. 26 is a 3D radiation pattern of the UWB transmitting antenna at 6.5 GHz in the antenna structure integrating the UWB antenna, the BLE antenna and the quarter-wavelength director;

[0026] Figure 5a FIG. 30 is a 2D radiation pattern in the YOZ plane at 6.5 GHz of the UWB transmitting antenna in the antenna structure integrating only the UWB antenna, the antenna structure integrating the UWB antenna and the BLE antenna, and the antenna structure integrating the UWB antenna, the BLE antenna and the quarter-wavelength director;

[0027] Figure 5b FIG. 34 is a 2D radiation pattern in the XOZ plane at 6.5 GHz of the UWB transmitting antenna in the antenna structure integrating only the UWB antenna, the antenna structure integrating the UWB antenna and the BLE antenna, and the antenna structure integrating the UWB antenna, the BLE antenna and the quarter-wavelength director;

[0028] Figure 5c FIG. 38 is a 2D radiation pattern in the XOY plane at 6.5 GHz of the UWB transmitting antenna in the antenna structure integrating only the UWB antenna, the antenna structure integrating the UWB antenna and the BLE antenna, and the antenna structure integrating the UWB antenna, the BLE antenna and the quarter-wavelength director;

[0029] Figure 6a The 3D radiation pattern of the UWB transmitting antenna in the antenna structure with only the UWB antenna integrated at 8 GHz;

[0030] Figure 6b The 3D radiation pattern of the UWB transmitting antenna in the antenna structure integrating the UWB antenna and the BLE antenna at 8 GHz;

[0031] Figure 6c The 3D radiation pattern of the UWB transmitting antenna in the antenna structure integrating the UWB antenna, the BLE antenna and the quarter - wavelength director at 8 GHz;

[0032] Figure 7a The 2D radiation pattern of the UWB transmitting antenna in the YOZ plane at 8 GHz in the antenna structure with only the UWB antenna integrated, the antenna structure integrating the UWB antenna and the BLE antenna, and the antenna structure integrating the UWB antenna, the BLE antenna and the quarter - wavelength director;

[0033] Figure 7b The 2D radiation pattern of the UWB transmitting antenna in the XOZ plane at 8 GHz in the antenna structure with only the UWB antenna integrated, the antenna structure integrating the UWB antenna and the BLE antenna, and the antenna structure integrating the UWB antenna, the BLE antenna and the quarter - wavelength director;

[0034] Figure 7c The 2D radiation pattern of the UWB transmitting antenna in the XOY plane at 8 GHz in the antenna structure with only the UWB antenna integrated, the antenna structure integrating the UWB antenna and the BLE antenna, and the antenna structure integrating the UWB antenna, the BLE antenna and the quarter - wavelength director;

[0035] Figure 8a The 3D radiation pattern of the BLE antenna in the antenna structure integrating the UWB antenna and the BLE antenna at 2.45 GHz;

[0036] Figure 8b The 3D radiation pattern of the BLE antenna in the antenna structure integrating the UWB antenna, the BLE antenna and the quarter - wavelength director at 2.45 GHz;

[0037] Figure 9a The 2D radiation pattern of the BLE antenna in the YOZ plane at 2.45 GHz in the antenna structure integrating the UWB antenna and the BLE antenna;

[0038] Figure 9bThe 2D radiation pattern of the BLE antenna in the XOZ plane at 2.45 GHz for the antenna structure integrating the UWB antenna and the BLE antenna;

[0039] Figure 9c The 2D radiation pattern of the BLE antenna in the XOY plane at 2.45 GHz for the antenna structure integrating the UWB antenna and the BLE antenna.

[0040] Among them, the reference numerals are as follows:

[0041] Dielectric plate - 100; First windowing area - 110; Second windowing area - 120; First clearance area - 130;

[0042] UWB transmitting antenna - 200;

[0043] First metal ground plane - 300; First notch - 310; First flared portion - 311; Second clearance area - 320; Third notch - 330; Third flared portion - 331; First protrusion - 340;

[0044] BLE antenna - 400;

[0045] Quarter - wavelength director - 500;

[0046] Second metal ground plane - 600; Second notch - 610; Second flared portion - 611; Third clearance area - 620; Fourth notch - 630; Fourth flared portion - 631; Second protrusion - 640;

[0047] First UWB receiving antenna - 700;

[0048] Second UWB receiving antenna - 800. Detailed implementation manner

[0049] The following further elaborates on the antenna structure and digital key proposed by the present utility model in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present utility model will be clearer. It should be noted that the accompanying drawings are in a very simplified form and use non-precise scales, only for the purpose of conveniently and clearly assisting in explaining the embodiments of the present utility model. In order to make the purpose, features, and advantages of the present utility model more obvious and understandable, please refer to the accompanying drawings. It should be noted that the structures, scales, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present utility model. Any modification of the structure, change in the proportional relationship, or adjustment of the size, in the case of being the same or similar to the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed by the present utility model. The specific design features of the present utility model disclosed herein, such as specific dimensions, directions, positions, and shapes, will be partially determined by the specific application and usage environment. Also, in the embodiments described below, sometimes the same reference numerals are used commonly between different drawings to represent the same parts or parts with the same functions, and the repeated description thereof is omitted. In this specification, similar reference numerals and letters are used to represent similar items. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings. Additionally, if the methods described herein include a series of steps, and the order of these steps presented herein is not necessarily the only order in which these steps can be executed, and some of the described steps can be omitted and / or some other steps not described herein can be added to the method.

[0050] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, it should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Also, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the said element. The singular forms "a", "an" and "the" include plural objects, the term "or" is generally used in the sense of "and / or", the term "several" is generally used in the sense of "at least one", the term "at least two" is generally used in the sense of "two or more", and the term "multiple" is generally used in the sense of "at least two".

[0051] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In the description of the present utility model, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to", "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. Additionally, in the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above and over", and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below and under", and "under the bottom of" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0052] The core idea of the present utility model is to provide an antenna structure and a digital key, which can effectively enhance the performance of the antenna under various environmental conditions and make the radiation intensity of the antenna more uniform in all directions. It should be noted that, as can be understood by those skilled in the art, the antenna structure provided by the present utility model can be applied not only to digital keys but also to other devices using antenna technology other than digital keys.

[0053] To achieve the above idea, the present utility model provides an antenna structure. Please refer to Figure 1 and Figure 2 , where Figure 1 is the front structural schematic diagram of the antenna structure provided by an embodiment of the present utility model; Figure 2 is the back structural schematic diagram of the antenna structure provided by an embodiment of the present utility model. As Figure 1 and Figure 2As shown in the figure, the antenna structure provided by the present utility model includes a dielectric plate 100, a UWB transmitting antenna 200, a first metal ground plate 300, a BLE antenna 400, a quarter-wavelength director 500, and a second metal ground plate 600; the UWB transmitting antenna 200 and the first metal ground plate 300 are both disposed on the upper surface of the dielectric plate 100, and the BLE antenna 400, the quarter-wavelength director 500, and the second metal ground plate 600 are all disposed on the lower surface of the dielectric plate 100; the UWB transmitting antenna 200 is an elliptical planar monopole structure, the BLE antenna 400 is a planar inverted-F structure, the BLE antenna 400 and the quarter-wavelength director 500 are both connected to the second metal ground plate 600, and the BLE antenna 400 and the quarter-wavelength director 500 are respectively disposed on both sides of the UWB transmitting antenna 200.

[0054] Since the UWB transmitting antenna 200 operates in the frequency bands of CH9 (7.75 GHz to 8.25 GHz) and CH5 (6.25 GHz to 6.75 GHz), and the BLE antenna 400 operating at 2.45 GHz has its second resonance frequency (actually slightly greater than 5 GHz) intersecting with the operating frequency bands of the UWB transmitting antenna 200 (please refer to Figure 3 , which is the S-parameter schematic diagram of each antenna in the antenna structure provided by an embodiment of the present utility model), therefore, the antenna structure provided by the present utility model can integrate the UWB transmitting antenna 200 with a small elliptical planar monopole structure and the BLE antenna 400 with a planar inverted-F structure, so that the BLE antenna 400 can realize the function of the auxiliary director of the UWB transmitting antenna 200 while meeting the requirements of the Bluetooth broadband, thereby enhancing the omnidirectional radiation performance of the UWB transmitting antenna 200 in the CH9 and CH5 frequency bands. At the same time, by setting the quarter-wavelength director 500, the radiation performance and directivity of the UWB transmitting antenna 200 and the BLE antenna 400 can be further enhanced. Thus, it can be seen that the antenna structure provided by the present utility model can effectively enhance the performance of the UWB transmitting antenna 200 and the BLE antenna 400 under various environmental conditions, making the radiation intensity of the UWB transmitting antenna 200 and the BLE antenna 400 more uniform in all directions. When the antenna structure provided by the present utility model is applied to a digital key, it can not only effectively improve the sensitivity of the all-round unlocking of the digital key, but also take into account the Bluetooth function and the radar function, significantly improving the performance and practicality of the digital key.

[0055] It should be noted that, as can be understood by those skilled in the art, both the UWB transmitting antenna 200 and the BLE antenna 400 have a feeding structure for connecting the feeding wires on the PCB board.

[0056] Please continue to refer to Figure 1 and Figure 2 as shown in Figure 1 and Figure 2 In some exemplary embodiments, the UWB transmitting antenna 200 is located at the first end of the upper surface of the dielectric board 100, the first metal ground plane 300 extends to the second end of the upper surface of the dielectric board 100, the BLE antenna 400 and the quarter-wavelength director 500 are located at the first end of the lower surface of the dielectric board 100, and the second metal ground plane 600 extends to the second end of the lower surface of the dielectric board 100; the first end of the first metal ground plane 300 is arranged to avoid the UWB transmitting antenna 200, so as to form a first windowing area 110 surrounding the UWB transmitting antenna 200 at the first end of the upper surface of the dielectric board 100, the first end of the second metal ground plane 600 is arranged to avoid the BLE antenna 400, so as to form a second windowing area 120 surrounding the BLE antenna 400 at the first end of the lower surface of the dielectric board 100, and the first windowing area 110 and the second windowing area 120 are arranged in an up-down corresponding manner along the thickness direction of the dielectric board 100 to jointly form a first clearance area 130 surrounding the UWB transmitting antenna 200 and the BLE antenna 400. Thus, by arranging the first windowing area 110 surrounding the UWB transmitting antenna 200 and the second windowing area 120 surrounding the BLE antenna 400 in an up-down corresponding manner along the thickness direction of the dielectric board 100, it is possible to enable the UWB transmitting antenna 200 and the BLE antenna 400 to share the same clearance area (i.e., the first clearance area 130), and further make the antenna layout more compact. On the premise of maintaining high-level performance of the UWB transmitting antenna 200 and the BLE antenna 400, it helps to reduce the size of the antenna structure, lower the production cost, and thus is conducive to realizing the miniaturization of the device applying the antenna structure provided by the present utility model and reducing the complexity of manufacturing and maintaining the device.

[0057] Please continue to refer to Figure 1 and Figure 2 as shown in Figure 1 and Figure 2 In some exemplary embodiments, the UWB transmitting antenna 200 is located in the middle area of the first end of the upper surface of the dielectric board 100. Thus, by arranging the UWB transmitting antenna 200 in the middle area of the first end of the upper surface of the dielectric board 100, it is more convenient to arrange the BLE antenna 400 and the quarter-wavelength director 500 on both sides of the UWB transmitting antenna 200.

[0058] Please continue to refer to Figure 1 and Figure 2 as shown in​Figure 1 and Figure 2 As shown in Figure 2 , in some exemplary embodiments, the antenna structure provided by the present utility model further includes a first UWB receiving antenna 700 and a second UWB receiving antenna 800. The first UWB receiving antenna 700 is disposed on the upper surface of the dielectric plate 100, and the second UWB receiving antenna 800 is disposed on the lower surface of the dielectric plate 100. Thus, by disposing the first UWB receiving antenna 700 on the upper surface of the dielectric plate 100 and the second UWB receiving antenna 800 on the lower surface of the dielectric plate 100, the first UWB receiving antenna 700 and the second UWB receiving antenna 800 can utilize the pattern diversity technique to further improve the receiving performance of the antenna structure provided by the present utility model, ensuring that the antenna structure provided by the present utility model has an omnidirectional signal receiving ability. It should be noted that, as can be understood by those skilled in the art, the first UWB receiving antenna 700 and the second UWB receiving antenna 800 also each have a feeding structure for connecting the feeding wire on the PCB board.

[0059] Please continue to refer to Figure 1 and Figure 2 , as Figure 1 and Figure 2 As shown in Figure 1 and Figure 2 , in some exemplary embodiments, the first UWB receiving antenna 700 is disposed on the first side of the upper surface of the dielectric plate 100, and the second UWB receiving antenna 800 is disposed on the second side of the lower surface of the dielectric plate 100. Thus, by disposing the first UWB receiving antenna 700 and the second UWB receiving antenna 800 on different sides of the dielectric plate 100, the receiving performance of the antenna structure provided by the present utility model can be further improved, ensuring that the antenna structure provided by the present utility model has an omnidirectional signal receiving ability.

[0060] Please continue to refer to Figure 1 and Figure 2 , as Figure 1 and Figure 2As shown, in some exemplary embodiments, a first notch 310 is formed in a first side of the first metal ground plane 300 and recessed toward a direction of a second side thereof, so as to form a second clearance area 320 around the first UWB receiving antenna 700; a second notch 610 is formed in a second side of the second metal ground plane 600 and recessed toward a direction of a first side thereof, so as to form a third clearance area 620 around the second UWB receiving antenna 800. Thus, by providing the first notch 310 in the first side of the first metal ground plane 300 to form the second clearance area 320 around the first UWB receiving antenna 700, not only can the layout of the antenna structure provided by the present invention be further made more compact, but also the isolation degree between the UWB transmitting antenna 200 and the first UWB receiving antenna 700 can be effectively ensured, thereby solving the coupling problem between the UWB transmitting antenna 200 and the first UWB receiving antenna 700. By providing the second notch 610 in the second side of the second metal ground plane 600 to form the third clearance area 620 around the second UWB receiving antenna 800, not only can the layout of the antenna structure provided by the present invention be further made more compact, but also the isolation degree between the UWB transmitting antenna 200 and the second UWB receiving antenna 800 can be effectively ensured, thereby solving the coupling problem between the UWB transmitting antenna 200 and the second UWB receiving antenna 800.

[0061] Please continue to refer to Figure 1 and Figure 2 , as Figure 1 and Figure 2As shown, in some exemplary embodiments, the opening side of the first notch 310 has a first flared portion 311, and the inner diameter of the side of the first flared portion 311 away from the first UWB receiving antenna 700 is greater than the inner diameter of the side close to the first UWB receiving antenna 700; the opening side of the second notch 610 has a second flared portion 611, and the inner diameter of the side of the second flared portion 611 away from the second UWB receiving antenna 800 is greater than the inner diameter of the side close to the second UWB receiving antenna 800. Thus, by providing the first flared portion 311 on the opening side of the first notch 310 of the first metal ground plane 300, the area of the second clearance area 320 provided around the first UWB receiving antenna 700 can be increased, so that the radiation area of the first UWB receiving antenna 700 can be increased, and the signal receiving performance of the first UWB receiving antenna 700 can be further improved. By providing the second flared portion 611 on the opening side of the second notch 610 of the second metal ground plane, the area of the third clearance area 620 provided around the second UWB receiving antenna 800 can be increased, so that the radiation area of the second UWB receiving antenna 800 can be increased, and the signal receiving performance of the second UWB receiving antenna 800 can be further improved.

[0062] Please continue to refer to Figure 1 and Figure 2 , as Figure 1 and Figure 2 shown, in some exemplary embodiments, the second side of the first metal ground plane 300 has a third notch 330 recessed in the direction of its first side, and the third notch 330 and the second notch 610 are arranged vertically corresponding to each other along the thickness direction of the dielectric plate 100 to jointly form the third clearance area 620; the first side of the second metal ground plane 600 has a fourth notch 630 recessed in the direction of its second side, and the fourth notch 630 and the first notch 310 are arranged vertically corresponding to each other along the thickness direction of the dielectric plate 100 to jointly form the second clearance area 320. Thus, by providing the third notch 330 corresponding to the second notch 610 on the second side of the first metal ground plane 300 to jointly form the third clearance area 620, the radiation area of the second UWB receiving antenna 800 can be further increased, and the signal receiving performance of the second UWB receiving antenna 800 can be further improved; by providing the fourth notch 630 corresponding to the first notch 310 on the first side of the second metal ground plane 600 to jointly form the second clearance area 320, the radiation area of the second UWB receiving antenna 800 can be further increased, and the signal receiving performance of the second UWB receiving antenna 800 can be further improved.

[0063] Please continue to refer to Figure 1and Figure 2 , such as Figure 1 and Figure 2 shown, in some exemplary embodiments, the opening side of the third notch 330 has a third flared portion 331, and the inner diameter of the side of the third flared portion 331 away from the second UWB receiving antenna 800 is greater than the inner diameter of the side close to the second UWB receiving antenna 800; the opening side of the fourth notch 630 has a fourth flared portion 631, and the inner diameter of the side of the fourth flared portion 631 away from the first UWB receiving antenna 700 is greater than the inner diameter of the side close to the first UWB receiving antenna 700. Thus, by providing the third flared portion 331 on the opening side of the third notch 330 of the first metal ground plane 300, the radiation area of the second UWB receiving antenna 800 can be further increased, thereby further improving the signal reception performance of the second UWB receiving antenna 800; by providing the fourth flared portion 631 on the opening side of the fourth notch 630 of the second metal ground plane 600, the radiation area of the first UWB receiving antenna 700 can be further increased, thereby further improving the signal reception performance of the first UWB receiving antenna 700.

[0064] Please continue to refer to Figure 1 and Figure 2 , such as Figure 1 and Figure 2As shown, in some exemplary embodiments, both sides of the end of the first metal ground plane 300 close to the UWB transmitting antenna 200 protrude towards the position where the UWB transmitting antenna 200 is located to form a first protruding portion 340; both sides of the end of the second metal ground plane 600 close to the BLE antenna 400 protrude towards the position where the BLE antenna 400 is located to form a second protruding portion 640. Thus, by providing the first protruding portion 340 that protrudes towards the position where the UWB transmitting antenna 200 is located at both sides of the end of the first metal ground plane 300 close to the UWB transmitting antenna 200, the isolation between the UWB transmitting antenna 200 and the first UWB receiving antenna 700 can be at least -20 dB, thereby effectively solving the coupling problem between the UWB transmitting antenna 200 and the first UWB receiving antenna 700; by providing the first protruding portion 340 that protrudes towards the position where the UWB transmitting antenna 200 is located at both sides of the end of the second metal ground plane 600 close to the UWB transmitting antenna 200, the isolation between the UWB transmitting antenna 200 and the second UWB receiving antenna 800 can be at least -20 dB, thereby effectively solving the coupling problem between the UWB transmitting antenna 200 and the second UWB receiving antenna 800. Furthermore, the accuracy and interference-free performance of the radar function of the antenna structure provided by the present utility model can be effectively ensured, meeting the strict requirements of the radar function.

[0065] Please continue to refer to Figure 1 and Figure 2 , as Figure 1 and Figure 2 shown, in some exemplary embodiments, the first protruding portion 340 and the second protruding portion 640 are wedge-shaped. Thus, this setting can facilitate the design and optimization of the first metal ground plane 300 and the second metal ground plane 600.

[0066] The inventor verified the performance of the antenna structure provided by the present utility model through the electromagnetic simulation software Ansys HFSS. The specific verification results are as Figures 4a to 9c shown, where Figure 4a is the 3D radiation pattern of the UWB transmitting antenna 200 in the antenna structure integrating only the UWB antenna at 6.5 GHz; Figure 4b is the 3D radiation pattern of the UWB transmitting antenna 200 in the antenna structure integrating the UWB antenna and the BLE antenna 400 at 6.5 GHz; Figure 4c is the 3D radiation pattern of the UWB transmitting antenna 200 in the antenna structure integrating the UWB antenna, the BLE antenna 400, and the quarter-wavelength director 500 at 6.5 GHz;Figure 5a The 2D radiation pattern of the UWB transmitting antenna 200 in the YOZ plane at 6.5 GHz for the antenna structure integrating only the UWB antenna, the antenna structure integrating the UWB antenna and the BLE antenna 400, and the antenna structure integrating the UWB antenna, the BLE antenna 400 and the quarter-wavelength director 500; Figure 5b The 2D radiation pattern of the UWB transmitting antenna 200 in the XOZ plane at 6.5 GHz for the antenna structure integrating only the UWB antenna, the antenna structure integrating the UWB antenna and the BLE antenna 400, and the antenna structure integrating the UWB antenna, the BLE antenna 400 and the quarter-wavelength director 500; Figure 5c The 2D radiation pattern of the UWB transmitting antenna 200 in the XOY plane at 6.5 GHz for the antenna structure integrating only the UWB antenna, the antenna structure integrating the UWB antenna and the BLE antenna 400, and the antenna structure integrating the UWB antenna, the BLE antenna 400 and the quarter-wavelength director 500. Figure 6a The 3D radiation pattern of the UWB transmitting antenna 200 at 8 GHz for the antenna structure integrating only the UWB antenna; Figure 6b The 3D radiation pattern of the UWB transmitting antenna 200 at 8 GHz for the antenna structure integrating the UWB antenna and the BLE antenna 400; Figure 6c The 3D radiation pattern of the UWB transmitting antenna 200 at 8 GHz for the antenna structure integrating the UWB antenna, the BLE antenna 400 and the quarter-wavelength director 500; Figure 7a The 2D radiation pattern of the UWB transmitting antenna 200 in the YOZ plane at 8 GHz for the antenna structure integrating only the UWB antenna, the antenna structure integrating the UWB antenna and the BLE antenna 400, and the antenna structure integrating the UWB antenna, the BLE antenna 400 and the quarter-wavelength director 500; Figure 7b The 2D radiation pattern of the UWB transmitting antenna 200 in the XOZ plane at 8 GHz for the antenna structure integrating only the UWB antenna, the antenna structure integrating the UWB antenna and the BLE antenna 400, and the antenna structure integrating the UWB antenna, the BLE antenna 400 and the quarter-wavelength director 500; Figure 7c The 2D radiation pattern of the UWB transmitting antenna 200 in the XOY plane at 8 GHz for the antenna structure integrating only the UWB antenna, the antenna structure integrating the UWB antenna and the BLE antenna 400, and the antenna structure integrating the UWB antenna, the BLE antenna 400 and the quarter-wavelength director 500.

[0067] Figure 8aThe 3D radiation pattern of the BLE antenna 400 in the antenna structure integrating the UWB antenna and the BLE antenna 400 at 2.45 GHz; Figure 8b The 3D radiation pattern of the BLE antenna 400 in the antenna structure integrating the UWB antenna, the BLE antenna 400 and the quarter-wavelength director 500 at 2.45 GHz. Figure 9a The 2D radiation pattern of the BLE antenna 400 in the YOZ plane of the antenna structure integrating the UWB antenna and the BLE antenna 400 at 2.45 GHz; Figure 9b The 2D radiation pattern of the BLE antenna 400 in the XOZ plane of the antenna structure integrating the UWB antenna and the BLE antenna 400 at 2.45 GHz; Figure 9c The 2D radiation pattern of the BLE antenna 400 in the XOY plane of the antenna structure integrating the UWB antenna and the BLE antenna 400 at 2.45 GHz.

[0068] It can be seen from Figures 4a to 7c that: The addition of the quarter-wavelength director 500 can greatly improve the omnidirectionality of the radiation pattern of the UWB transmitting antenna 200 in the two frequency bands of CH5 (6.25 GHz to 6.75 GHz) and CH9 (7.75 GHz to 8.25 GHz), especially in the ±y-axis direction, and the problem of the depression of the radiation pattern is effectively improved. In addition, the addition of the quarter-wavelength director 500 also improves the problem of the asymmetry of the radiation pattern of the UWB transmitting antenna 200 in the ±x-axis caused by the common clearance with the BLE antenna 400. In summary, by setting the quarter-wavelength director 500, the radiation intensity of the UWB transmitting antenna 200 in all directions can be made more uniform, especially in the lobe directions of the back and front of the antenna, and the non-uniformity of the radiation intensity is significantly reduced, which greatly improves the reliability of omnidirectional unlocking.

[0069] Furthermore, due to the structural defects of the PIFA antenna (Planar Inverted-F Antenna), the pattern of the BLE antenna 400 designed based on it has obvious defects at the feeding point. After adding the quarter-wavelength director 500, the problem of the obvious defects of the pattern of the BLE antenna 400 at the feeding point can be effectively improved. In summary, by setting the quarter-wavelength director 500, the omnidirectional radiation performance of the BLE antenna 400 at the center frequency of 2.45 GHz can be significantly improved, so that in Bluetooth communication, the signal coverage range is more uniform, and thus the Bluetooth function of the digital key can be improved.

[0070] To achieve the above idea, the present utility model further provides a digital key, and the digital key includes the antenna structure provided by the present utility model. Since the digital key provided by the present utility model has the antenna structure provided by the present utility model, the digital key provided by the present utility model has at least all the beneficial effects of the antenna structure provided by the present utility model. For specific details, reference can be made to the relevant descriptions of the beneficial effects of the antenna structure provided by the present utility model in the above text, so they will not be elaborated here one by one.

[0071] In summary, compared with the prior art, the antenna structure and digital key provided by the present utility model have the following beneficial effects:

[0072] Since the UWB transmitting antenna 200 operates in the frequency bands of CH9 (7.75 GHz to 8.25 GHz) and CH5 (6.25 GHz to 6.75 GHz), and for the BLE antenna 400 operating at 2.45 GHz, the second resonant frequency (actually slightly greater than 5 GHz) intersects with the operating frequency bands of the UWB transmitting antenna 200. Therefore, by integrally arranging the small elliptical planar monopole structure UWB transmitting antenna 200 and the planar inverted F-shaped BLE antenna 400 in the present utility model, the BLE antenna 400 can achieve the function of the auxiliary director of the UWB transmitting antenna 200 while meeting the requirements of Bluetooth broadband, thereby enhancing the omnidirectional radiation performance of the UWB transmitting antenna 200 in the CH9 and CH5 frequency bands. At the same time, by setting the quarter-wavelength director 500, the radiation performance and directivity of the UWB transmitting antenna 200 and the BLE antenna 400 can be further enhanced. It can be seen that the present utility model can effectively enhance the performance of the UWB transmitting antenna 200 and the BLE antenna 400 under various environmental conditions, making the radiation intensity of the UWB transmitting antenna 200 and the BLE antenna 400 more uniform in all directions. This can not only effectively improve the sensitivity of the digital key for all-round unlocking, but also take into account the Bluetooth function and the radar function, significantly enhancing the performance and practicality of the digital key.

[0073] Furthermore, in the present utility model, the first window area 110 arranged around the UWB transmitting antenna 200 and the second window area 120 arranged around the BLE antenna 400 are arranged to be vertically corresponding in the thickness direction of the dielectric plate 100, so that the UWB transmitting antenna 200 and the BLE antenna 400 can share the same clearance area. Furthermore, the antenna layout can be made more compact. On the premise of maintaining the high-level performance of the UWB transmitting antenna 200 and the BLE antenna 400, it helps to reduce the size of the antenna structure, lower the production cost, and thus is beneficial to the miniaturization of the device applying the present utility model and reduce the complexity of the manufacturing and maintenance of the device.

[0074] Furthermore, in the present utility model, by providing first protruding portions 340 at both corners on one end of the first metal ground plate 300 close to the UWB transmitting antenna 200, and second protruding portions 640 at both corners on one end of the second metal ground plate 600 close to the BLE antenna 400, the isolation between the UWB transmitting antenna 200 and the first UWB receiving antenna 700, and between the UWB transmitting antenna 200 and the second UWB receiving antenna 800 can be at least -20 dB. Thus, the coupling problem between the UWB transmitting antenna 200 and the first UWB receiving antenna 700, as well as the second UWB receiving antenna 800, can be effectively solved. Furthermore, the accuracy and interference-free performance of the radar function of the antenna structure provided by the present utility model can be effectively ensured, meeting the strict requirements of the radar function.

[0075] It should be noted that in the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0076] It should also be noted that the above description is only a description of the preferred embodiments of the present utility model, and does not impose any limitation on the scope of the present utility model. Any changes and modifications made by those of ordinary skill in the art of the present utility model based on the above disclosure fall within the protection scope of the present utility model. Obviously, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations are within the scope of the present utility model and its equivalent technologies, the present utility model also intends to include these modifications and variations.

Claims

1. An antenna structure, characterized in that: It includes a dielectric plate, a UWB transmitting antenna, a first metal ground plate, a BLE antenna, a quarter-wavelength director, and a second metal ground plate; The UWB transmitting antenna and the first metal ground plate are both arranged on the upper surface of the dielectric plate, and the BLE antenna, the quarter-wavelength director and the second metal ground plate are all arranged on the lower surface of the dielectric plate; The UWB transmitting antenna is an elliptical planar monopole structure, the BLE antenna is a planar inverted F-shaped structure, the BLE antenna and the quarter-wavelength director are both connected to the second metal ground plate, and the BLE antenna and the quarter-wavelength director are arranged on both sides of the UWB transmitting antenna.

2. The antenna structure according to claim 1, characterized in that: The UWB transmitting antenna is located at a first end of the upper surface of the dielectric plate, the first metal ground plate extends to a second end of the upper surface of the dielectric plate, the BLE antenna and the quarter-wavelength director are located at a first end of the lower surface of the dielectric plate, and the second metal ground plate extends to a second end of the lower surface of the dielectric plate; The first end of the first metal ground plate is arranged to avoid the UWB transmitting antenna to form a first window area around the UWB transmitting antenna at the first end of the upper surface of the dielectric plate. The first end of the second metal ground plate is arranged to avoid the BLE antenna to form a second window area around the BLE antenna at the first end of the lower surface of the dielectric plate. The first window area and the second window area are correspondingly arranged in the upper and lower directions along the thickness direction of the dielectric plate to jointly form a first clearance area around the UWB transmitting antenna and the BLE antenna.

3. The antenna structure according to claim 1, characterized in that: It also includes a first UWB receiving antenna and a second UWB receiving antenna. The first UWB receiving antenna is arranged on the upper surface of the dielectric plate, and the second UWB receiving antenna is arranged on the lower surface of the dielectric plate.

4. The antenna structure according to claim 3, characterized in that: The first UWB receiving antenna is disposed on a first side of the upper surface of the dielectric plate, and the second UWB receiving antenna is disposed on a second side of the lower surface of the dielectric plate.

5. The antenna structure according to claim 4, characterized in that: The first side of the first metal ground plate has a first notch recessed in the direction of its second side, so as to form a second clearance area arranged around the first UWB receiving antenna; the second side of the second metal ground plate has a second notch recessed in the direction of its first side, so as to form a third clearance area arranged around the second UWB receiving antenna.

6. The antenna structure according to claim 5, characterized in that: The opening side of the first notch has a first flared portion, and the inner diameter of the first flared portion on a side away from the first UWB receiving antenna is larger than the inner diameter of the side close to the first UWB receiving antenna; The opening side of the second notch has a second flared portion, and the inner diameter of the second flared portion at a side away from the second UWB receiving antenna is larger than the inner diameter of the side close to the second UWB receiving antenna.

7. The antenna structure according to claim 5, characterized in that: The second side of the first metal grounding plate has a third recessed recessed in the direction of the first side thereof, and the third recess and the second recess are correspondingly arranged in the upper and lower directions along the thickness direction of the dielectric plate to jointly form the third clearance area; the first side of the second metal grounding plate has a fourth recessed recessed in the direction of the second side thereof, and the fourth recess and the first recess are correspondingly arranged in the upper and lower directions along the thickness direction of the dielectric plate to jointly form the two clearance areas.

8. The antenna structure according to claim 7, characterized in that: The opening side of the third notch has a third flared portion, and the inner diameter of the side of the third flared portion away from the second UWB receiving antenna is larger than the inner diameter of the side close to the second UWB receiving antenna; The opening side of the fourth recess has a fourth flared portion, and an inner diameter of a side of the fourth flared portion away from the first UWB receiving antenna is larger than an inner diameter of a side of the fourth flared portion close to the first UWB receiving antenna.

9. The antenna structure according to claim 3, characterized in that: The two side corners of the first metal ground plate at one end close to the UWB transmitting antenna are protruded toward the location of the UWB transmitting antenna to form a first protrusion; the two side corners of the second metal ground plate at one end close to the BLE antenna are protruded toward the location of the BLE antenna to form a second protrusion.

10. A digital key, characterized in that: The invention comprises the antenna structure according to any one of claims 1 to 9.

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