Loop antenna electronic key device

Abstract

The utility model relates to a loop antenna electronic key device, which comprises a loop antenna module and a packaging body, the loop antenna module comprises an integrated multi-antenna unit, a control unit and a flexible substrate, and the integrated multi-antenna unit comprises a UWB antenna main body, a WLC antenna main body and a BLE antenna main body. The integrated multi-antenna unit and the control unit are pressed on the flexible substrate, the annular antenna module is packaged by the packaging body, and the whole device is of an annular structure. Compared with the prior art, the device has the advantages of compact structure, convenience in use and the like.

Description

Technical Field

[0001] The utility model relates to a wireless communication antenna device, in particular to a ring antenna electronic key device. Background Art

[0002] As consumers demand more convenience, security, and personalized experiences, traditional physical keys are no longer able to meet these demands. Digital key technology, with its unique advantages, is revolutionizing vehicle unlocking, starting, and personalization. Smartphone car key functionality combines a car's keyless entry system with smartphone communication technology, enabling users to control vehicle lock, unlock, start, and other functions using their phone.

[0003] Conventional smart car keys typically rely on electronic devices and apps. If the phone dies or the app experiences a problem, the user will be unable to use the vehicle normally. Furthermore, smart car keys can have compatibility issues with different models or devices, limiting their use. Some advanced smart car key features come with high costs, increasing the purchase price of the vehicle. Furthermore, with technological advancements, the functions and operations of smart car keys are becoming increasingly complex, making them more difficult for users to use. Smart car keys also require batteries, which have a limited lifespan and require regular replacement or recharging. Utility Model Content

[0004] The purpose of the present invention is to provide a ring antenna electronic key device in order to overcome the defects of the prior art such as complicated operation, inability to use independently and cumbersome charging.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] The utility model provides a ring antenna electronic key device, which is characterized in that it includes a ring antenna module and a packaging body. The ring antenna module includes an integrated multi-antenna unit, a control unit and a flexible substrate. The integrated multi-antenna unit includes a UWB antenna body, a WLC antenna body and a BLE antenna body. The integrated multi-antenna unit and the control unit are pressed on the flexible substrate. The packaging body encapsulates the ring antenna module, and the device as a whole has a ring structure.

[0007] Furthermore, an annular mounting area is provided in the middle of the outer ring surface of the package body, the flexible substrate is distributed in the annular mounting area, the UWB antenna body, the control unit and the BLE antenna body are installed on the flexible substrate and are located outside the annular mounting area; the WLC antenna body is located inside the annular mounting area and is arranged alternately with the UWB antenna body, the control unit and the BLE antenna body.

[0008] Furthermore, the UWB antenna body is provided with a UWB antenna feed point and a UWB antenna gap composed of magnetic material and a flexible substrate. The magnetic material constitutes an L-shaped matching circuit. Solder points are provided at both ends of the L-shaped matching circuit. The first end solder point is connected to the UWB antenna feed point and has a solder point. The second end solder point is connected to a branch or grounded.

[0009] Furthermore, the WLC antenna body has NFC near-field communication function and wireless charging function.

[0010] Furthermore, the WLC antenna body includes a WLC circuit, a WLC magnetic sheet and a WLC antenna via. The WLC circuit is arranged on the inner side of the WLC magnetic sheet. The WLC circuit includes an outer ring of the WLC circuit and an inner ring of the WLC circuit that are connected to each other. One end of the inner ring of the WLC circuit is an NFC antenna via. The end of the outer ring of the WLC circuit is provided with WLC interface 1 and WLC interface 2.

[0011] Furthermore, the control unit includes a microcontroller and a battery.

[0012] Furthermore, the loop antenna module also includes a motion sensor.

[0013] Furthermore, the package material is a composite material with microwave properties, and the composite material has a specific dielectric constant.

[0014] Furthermore, the ring antenna module is pressed into a ring shape by precision vacuum pressing and curing molding.

[0015] Furthermore, the packaging body includes an outer shell and an inner shell, and the loop antenna module and the flexible substrate are packaged between the outer shell and the inner shell after being pressed.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] 1. The utility model forms a composite substrate by precisely vacuum pressing and curing the antenna bodies of the UWB antenna, WLC antenna, and BLE antenna to form an antenna body with a flat antenna structure, which is then encapsulated in a housing to form a finger ring antenna electronic key device. The device integrates near-field communication functions, wireless charging functions, ultra-wideband technology, and Bluetooth functions. The device is compact and can perform multi-point feeding of the UWB / WLC / WLC chip antenna on the metal surface of the ring, enabling interaction with smart terminals such as mobile phones, televisions, and cars.

[0018] 2. Miniaturized antenna modules increase bandwidth and optimize the antenna pattern of each antenna, while also improving efficiency and reducing manufacturing costs. The WLC antenna body is designed with a long, narrow, flat, and helical structure, reducing the actual antenna area on the circuit board (including the antenna body and the required clearance). BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the ring antenna electronic key device

[0020] Figure 2 A partial diagram of the WLC antenna

[0021] Figure 3 Schematic diagram of the loop antenna module

[0022] In the figure, 1. Ring antenna module, 111. UWB antenna feed point, 112. UWB antenna slot, 113. UWB antenna first GND, 114. UWB antenna second GND, 121. WLC line, 1211. WLC line outer ring, 1212. WLC line inner ring, 1213. WLC interface 1, 1214. WLC interface 2, 122. WLC magnetic sheet, 123. WLC antenna via, 131. BLE antenna feed point, 1311. BLE antenna feed point 1, 1312. BLE antenna feed point 2, 132. BLE antenna GND, 14. Control unit, 15. Flexible substrate, 161. Motion sensor 1, 162. Motion sensor 2, 21. Outer shell, 22. Inner shell. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0024] This embodiment provides a ring antenna module 1 that can be easily processed into different sizes. When wearing the ring device, the user only needs to place a finger close to a specific area of ​​the vehicle to communicate and sense regardless of the direction, thereby realizing functions such as unlocking and starting the vehicle.

[0025] This embodiment provides an integrated miniaturized multi-antenna, wherein a plurality of magnetic sheets and antennas spaced apart from each other are bonded to the surface of the flexible substrate 15 and form a radiation pattern thereon, thereby preventing the deterioration of antenna characteristics due to annular deformation of the flexible substrate 15.

[0026] like Figure 1As shown, in this embodiment, the ring antenna module 1 of the ring antenna electronic key device is pressed and encapsulated within a housing. The outer housing 21 is made of metal, and the inner housing 22 is made of resin or ceramic. The UWB antenna, BLE antenna, and WLC antenna are arranged in a circular pattern on the flexible substrate 15, which is an FCCL soft board. On the UWB antenna chip, the UWB antenna feed point 111, UWB antenna slot 112, and UWB antenna GND are arranged sequentially. On the BLE antenna chip, BLE antenna feed point 1 1311 and BLE antenna feed point 2 1312 are arranged close together.

[0027] The loop antenna module 1 comprises a flexible substrate (FPCB or MPI material) and a magnetic shield (ferrite, absorber material, or nanocrystal). The shield forms a radiation pattern on the substrate. A terminal portion is formed at one end of the substrate and connected to one end of the radiation pattern. Multiple terminals or contact points are also formed on the substrate and connected to the other end of the radiation pattern. The loop antenna module 1 is bent into a flat or three-dimensional antenna structure. Each layer of the composite substrate is precisely vacuum-bonded and cured, effectively enhancing the antenna module's performance and reducing its manufacturing cost.

[0028] The base and magnetic shield of the loop antenna module 1 together form the antenna body, which includes a UWB antenna body, a WLC (NFC) antenna body, and a BLE antenna body. This antenna module features a specific circuit design. The package encapsulates each antenna body. The package is made of a composite material with microwave properties. Therefore, the package's dimensions and material can be designed to achieve a specific dielectric constant.

[0029] UWB stands for ultra-wideband technology. The UWB antenna circuit is based on a ring structure and is designed on a flexible printed circuit board. The circuit includes an input pad and an output pad, separated by an L-shaped matching circuit. Feed input is connected to the input pad, which then connects to the L-shaped matching circuit. The output pad is connected in series to a branch circuit or ground through the matching circuit. This design adjustment method aims to achieve better matching to the desired frequency band (7.872 GHz) through slot coupling, making this miniaturized antenna module versatile and convenient.

[0030] In this embodiment, the WLC part takes into account both NFC and wireless charging functions, including a material with high magnetic permeability, which can keep NFC in a stable magnetic field environment to avoid interference from surrounding metal, thereby improving the performance and stability of the antenna. It can enhance the antenna's magnetic field stability, signal transmission efficiency, receiving sensitivity, anti-interference ability, and degree of miniaturization and integration, thereby improving the overall performance and reliability of the smart car key. Figure 2As shown, the WLC interface 1 1213 and the WLC interface 2 1214 of the WLC antenna are arranged near the tail end of the NFC antenna included in the WLC antenna. The WLC circuit 121 includes a WLC circuit outer ring 1211 and a WLC circuit inner ring 1212, which are surrounded in a long rectangle. The circuit extends out from one side of the rectangle, and the extension is the NFC antenna via.

[0031] like Figure 3 As shown, the present invention forms an antenna module body with a flat antenna structure by precisely vacuum laminating and curing a composite substrate. The antenna module body also includes a control unit 14 and a motion sensor. The control unit 14 is located in the center of the flexible substrate 15 and includes a microcontroller and a battery. Motion sensor 161 and motion sensor 2 are located at opposite ends of the flexible substrate 15. The UWB antenna first GND 113, UWB antenna feed point 111, UWB antenna slot 112, and UWB antenna second GND 114 are sequentially arranged on the flexible substrate 15 between motion sensor 161 and the control unit 14. Furthermore, the BLE antenna feed point 131 and BLE antenna GND 132 are sequentially arranged on the flexible substrate 15 between the control unit 14 and motion sensor 2 162. The BLE antenna feed point 131 includes BLE antenna feed point 1311 and BLE antenna feed point 2 1312. The precision components, FPCB, and magnetic materials (ferrite) are folded to form the antenna body with a three-dimensional antenna structure. In another aspect, the packaging process used to enclose the antenna module differs from existing technologies. The packaging of the present invention comprises a specially formulated composite material, thereby simplifying the manufacturing process and reducing costs. Furthermore, the choice of specially formulated composite materials is diverse, and the parameters of the composite substrate can be varied to achieve the desired dielectric constant, which meets the required properties, minimizes size, and enhances the performance of the miniaturized antenna module.

[0032] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A ring antenna electronic key device, characterized in that: The invention comprises a ring antenna module (1) and a packaging body, wherein the ring antenna module (1) comprises an integrated multi-antenna unit, a control unit (14) and a flexible substrate (15), wherein the integrated multi-antenna unit comprises a UWB antenna body, a WLC antenna body and a BLE antenna body, wherein the integrated multi-antenna unit and the control unit (14) are pressed onto the flexible substrate (15), and the packaging body encapsulates the ring antenna module, and the device as a whole has a ring structure.

2. The ring antenna electronic key device according to claim 1, characterized in that: An annular mounting area is provided in the middle of the outer annular surface of the package body, the flexible substrate (15) is distributed in the annular mounting area, the UWB antenna body, the control unit (14) and the BLE antenna body are mounted on the flexible substrate (15) and are located outside the annular mounting area; the WLC antenna body is located inside the annular mounting area and is staggered with the UWB antenna body, the control unit (14) and the BLE antenna body.

3. The ring antenna electronic key device according to claim 1, characterized in that: The UWB antenna body is provided with a UWB antenna feed point (111) and a UWB antenna slot (112) composed of a magnetic material and a flexible substrate (15); the magnetic material forms an L-shaped matching circuit; solder joints are provided at both ends of the L-shaped matching circuit; the first solder joint is connected to the UWB antenna feed point (111) and is provided with a solder joint; and the second solder joint is connected to a branch circuit or is grounded.

4. The ring antenna electronic key device according to claim 1, characterized in that: The WLC antenna body has NFC near-field communication function and wireless charging function.

5. The ring antenna electronic key device according to claim 4, characterized in that: The WLC antenna body comprises a WLC circuit (121), a WLC magnetic sheet (122) and a WLC antenna via (123); the WLC circuit (121) is arranged inside the WLC magnetic sheet (122); the WLC circuit (121) comprises a WLC circuit outer ring (1211) and a WLC circuit inner ring (1212) connected to each other; one end of the WLC circuit inner ring (1212) is an NFC antenna via; and the end of the WLC circuit outer ring (1211) is provided with a WLC interface 1 (1213) and a WLC interface 2 (1214).

6. The ring antenna electronic key device according to claim 1, characterized in that: The control unit (14) includes a microcontroller and a battery.

7. The ring antenna electronic key device according to claim 1, characterized in that: The loop antenna module (1) also includes a motion sensor.

8. The loop antenna electronic key device according to claim 1, characterized in that: The ring antenna module (1) is pressed into a ring shape by precise vacuum pressing and curing molding.

9. The loop antenna electronic key device according to claim 1, characterized in that: The packaging body comprises an outer shell (21) and an inner shell (22); the loop antenna module and the flexible substrate are packaged between the outer shell (21) and the inner shell (22) after being pressed.

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