Antenna Diversity for Wireless Locks Resolving Multi-Path Interference
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Solution Overview
Problem
Existing electronic lock systems face issues with multi-path interference in indoor environments, leading to unpredictable communication ranges and frequent failures due to signal distortion, which necessitates redundant hardwiring and increased interface devices in large facilities.
Innovation Solution
The implementation of an electronic door lock system with multiple antennas and a controller that determines signal strength and automatically switches to the best antenna for reception, utilizing antenna diversity to minimize multi-path interference and maintain reliable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If wireless communication is used between interface devices and electronic locks, then installation complexity is reduced and hardwiring costs are eliminated, but communication reliability deteriorates due to multi-path interference and signal distortion
Solution Approach 1:
The electronic lock device is segmented to include multiple antennas (first antenna and second antenna) instead of a single antenna. This segmentation allows the system to receive signals through multiple independent paths, reducing the impact of multi-path interference and improving communication reliability in wireless environments.
Solution Approach 2:
The system dynamically changes the reception parameter by switching between different antennas based on signal strength measurements. The controller monitors signal quality and switches to an alternative antenna when signal distortion is detected, thereby adapting to changing wireless conditions and maintaining reliable communication.
2Area of stationary object
If the number of interface devices is increased to accommodate large facilities, then coverage is improved, but system complexity and cost increase due to more hardwired connections to central controllers
Solution Approach 1:
Each electronic lock is equipped with multiple antennas that can serve different reception functions, making the lock device itself more capable of handling various signal conditions. This reduces the need for additional interface devices and hardwired connections, as each lock can independently maintain reliable wireless communication across different locations.
3Reliability
If interface devices are relocated closer to electronic locks to overcome signal distortion, then communication reliability is improved, but installation flexibility is reduced and the number of interface devices must be increased
Solution Approach 1:
The electronic lock incorporates dynamic antenna switching capability, allowing it to adapt to changing signal conditions in real-time. The controller continuously monitors signal strength and switches between antennas dynamically, enabling the system to maintain reliable communication without requiring fixed installation positions or proximity between interface devices and locks.
4Device complexity
If a single antenna is used in electronic locks, then device complexity is reduced, but communication reliability deteriorates due to multi-path interference and unpredictable working range
Solution Approach 1:
The antenna system is segmented into multiple independent antennas within the electronic lock. This segmentation provides diverse reception paths for wireless signals, reducing the effects of multi-path interference and expanding the predictable working range without significantly increasing overall device complexity.
Solution Approach 2:
The controller implements feedback by monitoring signal strength from multiple antennas and automatically switching to the antenna with the strongest signal. This feedback mechanism ensures optimal reception and maintains reliable communication while managing the complexity of the multi-antenna system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances communication reliability and range, reduces the need for redundant hardware, and conserves battery life by minimizing power consumption, while adapting to dynamic environments and reducing service calls.
Implementation Method 1
The electronic signals traveling along multiple paths will be out of phase with other received signals and cause the multi-path distortion
Implementation Method 2
receiving a first wireless signal at a first antenna of the electronic door lock and receiving a second wireless signal at a second antenna of the electronic door lock
Data Source
AI summary
An electronic lock system including an access control device configured to provide system instructions, an interface module electrically coupled to the access control device and configured to transmit RF signals in response to system instructions received from the access control device, and a plurality of wireless electronic door locks each configured to wirelessly communicate with the interface module. Each of the wireless electronic door locks includes a controller and a wireless receiver operatively connected to the controller, the wireless receiver including a first antenna defined as a circuit board trace and a second antenna, spaced from the first antenna and defined as a circuit board trace. Each of the first antenna and the second antenna include one of a monopole antenna and a fractal antenna. The controller is configured to switch between the first antenna and the second antenna to receive a wireless signal having a greater signal strength.