Carrier Wave Control for RFID Switch Wear Reduction
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Solution Overview
Problem
Conventional wireless communication devices using phase-inverted loop antennas often fail to establish reliable communication with wireless tags moving at low speeds due to inadequate power-on-reset functions and shortened switch lifetimes from frequent phase inversion operations.
Innovation Solution
A wireless communication device with a carrier wave control unit that periodically controls the carrier wave to a temporary OFF state or lower power level, ensuring proper power-on-reset functions and reducing switch wear by optimizing antenna usage and power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phase inversion is performed frequently to minimize non-detectible regions, then communication coverage is improved, but switch lifetime is shortened due to excessive contact point wear
Solution Approach 1:
The patent extracts the phase inversion function from the mechanical switch and implements it through electronic signal processing. The carrier wave phase is inverted by controlling the signal output without physically switching connections, thereby eliminating wear on contact points while maintaining the ability to minimize non-detectible regions.
Solution Approach 2:
The patent replaces the mechanical relay switch with an electronic control system that generates and modulates carrier waves. The phase inversion is achieved through electronic signal manipulation rather than mechanical contact switching, substituting a wear-free electronic system for a wear-prone mechanical system.
2Use of energy by moving object
If carrier wave power is continuously high to ensure power delivery to low-speed wireless tags, then power delivery is improved, but power-on-reset function fails to operate properly
Solution Approach 1:
The patent implements periodic interruption of the carrier wave transmission. By temporarily stopping the carrier wave at regular intervals, the system allows the wireless tag's power-on-reset function to execute properly while still delivering sufficient power during the active transmission periods. This periodic on-off pattern resolves the conflict between continuous power delivery and proper reset function operation.
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 solution enhances communication reliability and extends switch lifespan by ensuring effective power delivery to wireless tags regardless of their speed and reducing switch wear, thereby establishing stable connections and prolonging device lifespan.
Implementation Method 1
a carrier wave transmitting unit configured to transmit via the antenna a carrier wave to a communication object located in a communication ready area
Data Source
AI summary
A reader/writer of a wireless communication device transmits a carrier signal from an antenna, and if there is not response from an IC card within a preset time after transmitting the polling command, the carrier signal is temporarily controlled to an OFF state.