An antenna layout structure for a smart door lock

Abstract

The utility model discloses an antenna layout structure for intelligent door lock, including PCB board, MCU, BLE module and UWB module are integrated on the PCB board, BLE module, UWB module are connected with MCU signal respectively, BLE module is connected with BLE antenna unit, UWB module is connected with UWB array antenna unit A, UWB array antenna unit B and UWB array antenna unit C respectively, UWB array antenna unit A, UWB array antenna unit B and UWB array antenna unit C constitute the UWB array antenna of the central line is isosceles right triangle, and UWB array antenna and BLE antenna unit are diagonally distributed on the PCB board, the utility model discloses an antenna layout structure for intelligent door lock, and the structure design is reasonable, combines the safe convenient of UWB and the low power consumption advantage of BLE, and three unit UWB array antenna of triangular arrangement can realize accurate space perception, improves the identification rate in and outside the door.

Description

Technical Field

[0001] This utility model relates to the field of antenna technology for smart door locks, and specifically to an antenna layout structure for smart door locks, and particularly to a BLE+UWB multi-antenna array layout structure for smart door locks. Background Technology

[0002] UWB smart locks have moved beyond the proof-of-concept stage and entered the commercialization and ecosystem development phase. Their high security and seamless convenience are significant advantages, and core security mechanisms (such as anti-relay attacks) are mature and reliable. The current market situation is that the technology itself is ready, awaiting cost reductions and further ecosystem unification, allowing for rapid adoption from high-end flagship products to the mass market. For users seeking ultimate security and quality of life, smart locks equipped with mature UWB technology are already a very reliable choice.

[0003] Currently, the common layouts for UWB door locks on the market mostly use one or two omnidirectional antennas, or two directional antennas. While a single omnidirectional antenna can measure distance, it cannot accurately determine whether a person is indoors or outdoors and requires complex algorithms. A two-directional antenna solution, with one facing indoors and the other outdoors, cannot measure angles and is unsuitable for future smart home scenarios. To achieve accurate spatial perception (especially distinguishing between inside and outside the door), high-end door locks generally use two or more UWB antennas, achieving centimeter-level positioning through time difference of arrival or angle of arrival estimation algorithms. However, this is too costly, hindering its further widespread application. For ordinary consumers, BLE+UWB may be a more realistic, economical, and better-performing option under current technological conditions, perfectly combining the security and convenience of UWB with the low power consumption and ecosystem advantages of BLE.

[0004] Therefore, developing a BLE+UWB multi-antenna array layout structure for smart door locks that requires no complex algorithms, is low-cost, and has high positioning accuracy is of great practical significance. Utility Model Content

[0005] Due to the aforementioned defects in existing technologies, this utility model provides a BLE+UWB multi-antenna array layout structure for smart door locks that requires no complex algorithms, is low in cost, and has high positioning accuracy. This improves the probability of identification between inside and outside the door, thus solving the problems of existing door lock antenna layout structures requiring complex algorithms, being too costly, and being unsuitable for future intelligent scenarios.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An antenna layout structure for a smart door lock, including a PCB board;

[0008] The PCB board integrates an MCU, a BLE module, and a UWB module.

[0009] The BLE module and UWB module are respectively connected to the MCU signal, the BLE module is connected to the BLE antenna unit, and the UWB module is respectively connected to UWB array antenna unit A, UWB array antenna unit B and UWB array antenna unit C.

[0010] The UWB array antenna unit A, UWB array antenna unit B, and UWB array antenna unit C form a UWB array antenna, and the center line connecting UWB array antenna unit A, UWB array antenna unit B, and UWB array antenna unit C is an isosceles right triangle. The UWB array antenna and the BLE antenna unit are diagonally distributed on the PCB board. This distribution can reduce the coupling effect of low-frequency BLE on high-frequency UWB antenna and improve isolation.

[0011] The operating logic of the antenna layout structure for the above smart door lock is as follows:

[0012] Wake-up: When a user approaches the door lock with their mobile phone (within a range of about 5 to 10 meters), the door lock's UWB module is woken up and begins broadcasting;

[0013] Start ranging and positioning: Bidirectional ranging between the mobile phone and the door lock begins, and the system continues to calculate: (using only antenna unit A);

[0014] Real-time distance: When a user approaches the door within approximately 2 meters, they enter the lockable range;

[0015] Motion trajectory: Further, by analyzing the motion trajectory, it can be determined whether the user is continuously approaching the door lock (at this time, two horizontal antennas can be used to measure the trajectory, providing one-dimensional information);

[0016] Spatial location: Further clarify whether the user is outside the door (determined through multi-antenna technology; horizontal + vertical measurements can determine spatial location, resulting in two-dimensional spatial location);

[0017] Authentication and Execution: The door lock automatically unlocks when all conditions (distance, direction, identity) meet the preset security policy.

[0018] Feedback: Provide clear feedback to the user through sound, light, or the sound of a motor turning.

[0019] All three UWB array antennas face outwards from the door. Once the user enters the room, the three UWB array antennas do not work; they only start working 2 meters outside the door, which does not significantly increase the power consumption of the device.

[0020] The antenna layout structure of this utility model for smart door locks is rationally designed. BLE is responsible for initial device discovery, broadcasting, and long-distance low-power connection. Before UWB completes accurate ranging, BLE first establishes a connection and wakes up the UWB module, thereby saving overall power consumption. This perfectly combines the security and convenience of UWB with the low power consumption and ecological advantages of BLE. The three-unit UWB array antenna arranged in a triangle can achieve accurate spatial perception and improve the recognition rate inside and outside the door, which has great application prospects.

[0021] As a preferred technical solution:

[0022] As described above, in an antenna layout structure for a smart door lock, the BLE antenna element is an inverted-F antenna that radiates omnidirectionally and is responsible for initial device discovery, broadcasting, and long-distance low-power connection.

[0023] In the antenna layout structure for a smart door lock described above, the BLE antenna element is surrounded by a non-copper-paved clearance area, which is more than 5mm away from the reference ground.

[0024] In the antenna layout structure for a smart door lock described above, the UWB array antenna unit A is located at one corner of the PCB board;

[0025] The UWB array antenna element B and UWB array antenna element C are located on both sides of the UWB array antenna element A, respectively.

[0026] The center-to-center distance between the UWB array antenna element B, UWB array antenna element C and UWB array antenna element A is half the antenna wavelength (specifically 17mm).

[0027] In the antenna layout structure for a smart door lock described above, the UWB array antenna unit A, UWB array antenna unit B, and UWB array antenna unit C are circularly polarized microstrip antennas.

[0028] In the antenna layout structure for a smart door lock described above, the UWB array antenna unit A is connected to the UWB module via a radio frequency signal line;

[0029] The UWB array antenna unit B and UWB array antenna unit C are connected to the UWB module via another radio frequency signal line, and the other radio frequency signal line is equipped with a switch for switching the connection unit.

[0030] As described above, in the antenna layout structure for a smart door lock, the UWB array antenna unit A has a ranging function;

[0031] The UWB array antenna unit A and UWB array antenna unit B work together to measure the horizontal azimuth angle, and the UWB array antenna unit B and UWB array antenna unit C work together to measure the spatial pitch angle. When a person stands outside the door, this array combination can accurately sense the spatial position and greatly improve the indoor and outdoor discrimination rate.

[0032] The above technical solution is only one feasible technical solution of this utility model. The protection scope of this utility model is not limited to this. Those skilled in the art can reasonably adjust the specific design according to actual needs.

[0033] The above-mentioned utility model has the following advantages or beneficial effects:

[0034] The antenna layout structure of this utility model for smart door locks is rationally designed. BLE is responsible for initial device discovery, broadcasting, and long-distance low-power connection. Before UWB completes accurate ranging, BLE first establishes a connection and wakes up the UWB module, thereby saving overall power consumption. This perfectly combines the security and convenience of UWB with the low power consumption and ecological advantages of BLE. The three-unit UWB array antenna arranged in a triangle can achieve accurate spatial perception and improve the recognition rate inside and outside the door, which has great application prospects. Attached Figure Description

[0035] The present invention, its features, shape, and advantages will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference numerals denote like parts throughout the drawings. The drawings are not drawn to scale; the focus is on illustrating the gist of the invention.

[0036] Figure 1 This is a schematic diagram showing the connection of each component in the antenna layout structure of the smart door lock of this utility model.

[0037] Figure 2 This is a schematic diagram of the antenna layout structure for the smart door lock of this utility model;

[0038] Among them, 1-BLE module, 2-MCU, 3-UWB module, 4-switch, 5-UWB array antenna unit A, 6-UWB array antenna unit B, 7-UWB array antenna unit C, and 8-BLE antenna unit. Detailed Implementation

[0039] The structure of this utility model will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the utility model.

[0040] Example 1

[0041] An antenna layout structure for a smart door lock, such as Figures 1-2 As shown, this includes the PCB board;

[0042] The PCB board integrates MCU 2, BLE module 1, and UWB module 3;

[0043] BLE module 1 and UWB module 3 are respectively connected to MCU 2. BLE module 1 is connected to BLE antenna unit 8. There is a clear area without copper plating around BLE antenna unit 8. BLE antenna unit 8 is an inverted F antenna. UWB module 3 is connected to UWB array antenna unit A 5, UWB array antenna unit B 6 and UWB array antenna unit C 7 respectively.

[0044] UWB array antenna elements A5, B6, and C7 form a UWB array antenna. The center line connecting UWB array antenna elements A5, B6, and C7 forms an isosceles right triangle. UWB array antenna element A5 is located at one corner of the PCB board, while UWB array antenna elements B6 and C7 are located on either side of UWB array antenna element A5. The center-to-center distance between UWB array antenna elements B6, C7, and A5 is half the antenna wavelength (specifically 17mm). All three elements are circularly polarized microstrip antennas. UWB array antenna element A5 is connected to UWB module 3 via a single RF signal line. 7 is connected to UWB module 3 via another RF signal line, and the other RF signal line is equipped with a switch 4 for switching connection units. UWB array antenna unit A 5 has a ranging function. UWB array antenna unit A 5 and UWB array antenna unit B 6 can measure the horizontal azimuth angle. UWB array antenna unit B 6 and UWB array antenna unit C 7 can measure the spatial pitch angle. When a person stands outside the door, this array combination can accurately sense the spatial position and greatly improve the indoor and outdoor discrimination rate. UWB array antenna and BLE antenna unit 8 are diagonally distributed on the PCB board.

[0045] Verification has shown that the antenna layout structure of this utility model for smart door locks is reasonably designed. BLE is responsible for initial device discovery, broadcasting, and long-distance low-power connection. Before UWB completes accurate ranging, BLE establishes a connection and wakes up the UWB module, thereby saving overall power consumption. This perfectly combines the security and convenience of UWB with the low power consumption and ecological advantages of BLE. The three-unit UWB array antenna arranged in a triangle can achieve accurate spatial perception, improve the recognition rate inside and outside the door, and has great application prospects.

[0046] Those skilled in the art should understand that variations can be implemented by combining existing technology with the above embodiments, which will not be elaborated here. Such variations do not affect the substantive content of this utility model, and will not be elaborated here.

[0047] The preferred embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above. Devices and structures not described in detail herein should be understood as being implemented in a conventional manner within the art. Any person skilled in the art can make many possible variations and modifications to the technical solutions of this utility model using the disclosed methods and techniques, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of this utility model. This does not affect the essential content of this utility model. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model, without departing from the content of the technical solution of this utility model, still fall within the protection scope of the technical solution of this utility model.

Claims

1. An antenna layout structure for a smart door lock, characterized in that: Including PCB boards; The PCB board integrates an MCU, a BLE module, and a UWB module. The BLE module and UWB module are respectively connected to the MCU signal, the BLE module is connected to the BLE antenna unit, and the UWB module is respectively connected to UWB array antenna unit A, UWB array antenna unit B and UWB array antenna unit C. The UWB array antenna unit A, UWB array antenna unit B, and UWB array antenna unit C form a UWB array antenna, and the center line connecting the UWB array antenna unit A, UWB array antenna unit B, and UWB array antenna unit C is an isosceles right triangle. The UWB array antenna and the BLE antenna unit are diagonally distributed on the PCB board.

2. The antenna layout structure for a smart door lock according to claim 1, characterized in that, The BLE antenna element is an inverted F antenna.

3. The antenna layout structure for a smart door lock according to claim 1, characterized in that, The BLE antenna element is surrounded by a non-copper-paved clearance area.

4. The antenna layout structure for a smart door lock according to claim 1, characterized in that, The UWB array antenna unit A is located in one corner of the PCB board; The UWB array antenna element B and UWB array antenna element C are located on both sides of the UWB array antenna element A, respectively. The center-to-center distance between the UWB array antenna elements B, C, and A is half the antenna wavelength.

5. The antenna layout structure for a smart door lock according to claim 4, characterized in that, The UWB array antenna unit A, UWB array antenna unit B, and UWB array antenna unit C are circularly polarized microstrip antennas.

6. The antenna layout structure for a smart door lock according to claim 4, characterized in that, The UWB array antenna unit A is connected to the UWB module via a radio frequency signal line; The UWB array antenna unit B and UWB array antenna unit C are connected to the UWB module via another radio frequency signal line, and the other radio frequency signal line is equipped with a switch for switching the connection unit.

7. The antenna layout structure for a smart door lock according to claim 6, characterized in that, The UWB array antenna element A has ranging capabilities.

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