RF Patch Antenna Back Lobe Suppression for Access Control
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Solution Overview
Problem
Current access systems for secured areas, such as hotel rooms and buildings, face challenges in providing seamless and secure entry using mobile devices, as they often require specialized transceivers and lack sufficient security, leading to vulnerabilities in unauthorized access.
Innovation Solution
A wireless access system utilizing radio frequency patch antennas with shaped radiation patterns and access nodes that communicate with mobile devices via Bluetooth or other short-range wireless standards, enabling secure and frictionless access by periodically changing access codes and using proximity verification, while minimizing back lobe radiation to differentiate between inside and outside positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If directional antennas with back lobes are used for wireless access, then signal coverage is improved, but the ability to differentiate between inside and outside positions deteriorates
Solution Approach 1:
The patent extracts and eliminates the back lobe radiation component from the antenna system. By using a planar antenna array with specific element configurations and signal processing techniques, the system removes the harmful back lobe signals that cause position differentiation failures, while preserving the main lobe coverage for legitimate access.
Solution Approach 2:
The patent introduces asymmetry in the antenna radiation pattern by deliberately shaping the beam to have strong forward directionality and suppressed backward radiation. This asymmetric pattern allows the system to distinguish between devices inside the structure (strong signal) and devices outside (weak or no signal), resolving the position differentiation problem.
2Reliability
If access codes are changed frequently to improve security, then security vulnerabilities are reduced, but system complexity increases
Solution Approach 1:
The patent implements periodic action by automatically changing access codes at predetermined time intervals without user intervention. The system handles code generation, distribution, and synchronization automatically, reducing security vulnerabilities while avoiding the complexity burden on users through automated periodic updates.
Solution Approach 2:
The patent uses feedback mechanisms where the system automatically monitors usage patterns, time intervals, and device communications to dynamically adjust code change frequencies. This feedback loop optimizes security levels while managing system complexity through intelligent, adaptive control rather than fixed complex protocols.
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
The system provides secure, efficient, and seamless access to restricted areas, reducing the need for specialized hardware and minimizing vulnerabilities, allowing users to enter rooms or areas without additional steps, while maintaining high security standards.
Implementation Method 1
radio frequency patch antenna design and radiation pattern shaping to be used for receiving a request for access
Data Source
AI summary
A wireless device system employs short-range wireless communication to require the proximity of a user device to a defined area prior to communicating a request or notification to the wireless user device. The system authenticates a request and the proximity of the user to or within the defined area prior to transmitting a command, request, or notification to the user or a third party. Additionally, the system uses an access node configured to shape the radiation pattern of short-range wireless communications to better determine the position of a user proximate in or around a defined area.