UWB Reader Antenna Layout for Secure Access Intent Detection
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Solution Overview
Problem
Existing physical access control systems (PACS) face challenges in accurately determining user intent to access secure areas, particularly due to limitations in range and accuracy of wireless communication technologies like BLE, which can lead to unauthorized access when users are merely passing by.
Innovation Solution
The implementation of an ultra-wide band (UWB) antenna configuration in PACS readers, which includes two UWB antennas arranged at non-zero or non-parallel angles relative to the mounting plane, and a material with specific permittivity to slow down electromagnetic waves, allowing for accurate localization and intent determination based on the angle of incidence and outside/inside determinations of the credential device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If BLE wireless communication is used for access control, then ease of operation is improved, but measurement precision deteriorates leading to unauthorized access
Solution Approach 1:
The system segments the wireless communication function into two different technologies: BLE for initial connection and credential exchange, and UWB for precise distance measurement and intent determination. This segmentation allows each technology to perform its optimal function while overcoming individual limitations.
Solution Approach 2:
The system uses a composite communication approach combining BLE and UWB technologies. BLE handles authentication and data exchange while UWB provides accurate ranging, creating a composite system that leverages the strengths of both technologies to resolve the precision-ease contradiction.
2Measurement precision
If UWB antenna separation is increased to improve localization accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent changes the physical parameter of antenna separation distance to optimize localization accuracy. By spacing antennas at least half a wavelength apart, the system achieves sufficient angular resolution for intent determination without requiring overly complex antenna arrays.
Solution Approach 2:
The system transitions from a single-antenna configuration to a multi-antenna spatial arrangement, using the dimensional aspect of antenna positioning to achieve angular information. This spatial dimensionality enables the system to determine user intent through angle of arrival measurements.
3Measurement precision
If material with high permittivity is used to slow electromagnetic waves, then measurement precision is improved through better wave control, but manufacturing precision requirements increase
Solution Approach 1:
The system changes the electromagnetic parameter of the substrate material by selecting materials with specific permittivity values (4-10). This parameter change allows control over electromagnetic wave propagation speed and wavelength, improving localization precision while the thickness range (0.5-5mm) balances performance with manufacturability.
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 solution enhances the accuracy of user intent determination to tens of centimeters, providing both range and direction information of the credential device, thereby reducing unauthorized access and improving the user experience by allowing seamless access control.
Implementation Method 1
a material can be provided between the first and second antennas. The material can have a thickness that defines a distance between the first and second antennas of less than a half wavelength of the UWB signal through air (λA/2), the material configured to slow down electromagnetic waves passing therethrough
Data Source
AI summary
The present disclosure relates to a reader, such as a reader for a physical access control system. The reader can include first and second antennas, each designed or configured for receiving ultra-wide band (UWB) signals. The reader can also include a mounting plane configured for mounting the reader to a surface. An axis aligning the first and second antennas can be arranged substantially perpendicular relative the mounting plane. A material can be provided between the first and second antennas. The material can have a thickness that defines a distance between the first and second antennas of less than a half wavelength of the UWB signal through air (λA/2), the material configured to slow down electromagnetic waves passing therethrough such that the thickness of the material provides an effective separation distance of the first and second antennas of at least a half wavelength of the UWB signal through air (λA/2).