Resonance Frequency Adjustment for Non-Contact Wireless Antennas
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Solution Overview
Problem
Variations in component assembly precision and electronic component characteristics in non-contact wireless communication devices lead to fluctuations in resonance frequency, resulting in service unavailable areas despite compliance with communication standards.
Innovation Solution
A non-contact wireless communication apparatus with a resonance capacitor connected in parallel to the antenna, a resonance frequency adjustment unit, a capacitance change control unit, and an on/off control unit, which adjusts the resonance frequency by changing capacitance and controlling the on/off operation to maintain a predetermined frequency, thereby absorbing variations and preventing service unavailable areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the resonance frequency is managed within a narrow range to prevent service unavailable areas, then communication reliability is improved, but manufacturing difficulty increases due to variations in component assembly precision and electronic component characteristics
Solution Approach 1:
The patent applies dynamics by making the resonance frequency adjustable through a variable capacitor that can change capacitance values. The resonance frequency is no longer fixed but can be dynamically adjusted to compensate for manufacturing variations, allowing the system to adapt to different component characteristics while maintaining communication reliability.
Solution Approach 2:
The patent changes the capacitance parameter of the resonance capacitor to adjust the resonance frequency. By varying the capacitance value, the system can shift the resonance frequency to compensate for variations in component assembly and electronic component characteristics, thereby maintaining reliable communication without requiring narrow frequency management during manufacturing.
2Reliability
If the resonance frequency is adjusted to compensate for component variations, then service unavailable areas are eliminated, but device complexity increases due to additional adjustment mechanisms
Solution Approach 1:
The variable capacitor serves multiple functions: it acts as the resonance capacitor for the RFID antenna and simultaneously provides frequency adjustment capability. This multi-functionality eliminates the need for separate frequency adjustment components, reducing device complexity while maintaining service availability.
Solution Approach 2:
The system performs self-adjustment of the resonance frequency through the variable capacitor that can be controlled by the device's own control circuitry. This self-service capability allows the device to automatically compensate for component variations without requiring external calibration equipment or complex adjustment mechanisms.
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 effectively extends the management range of resonance frequency, allowing for easy adjustment and maintaining good communication characteristics, facilitating device manufacturing by ensuring consistent resonance frequencies across devices.
Implementation Method 1
a resonance capacitor (41) connected in parallel to the non-contact wireless communication antenna (11) and for obtaining a predetermined resonance frequency with the non-contact wireless communication antenna (11)
Implementation Method 2
receives a power supply from an external device by inductive coupling in a non-contact manner
Implementation Method 3
The resonance frequency adjustment unit changes a resonance capacitance of the resonance capacitor to adjust the resonance frequency
Data Source
AI summary
A non-contact wireless communication apparatus and a mobile terminal apparatus are provided. The non-contact wireless communication apparatus includes a non-contact wireless communication antenna, a resonance capacitor, connected in parallel with the non-contact wireless communication antenna, for obtaining a predetermined resonance frequency with the non-contact wireless communication antenna, a resonance frequency adjustment unit for changing a resonance capacitance of the resonance capacitor to adjust the resonance frequency, a capacitance change amount control unit for controlling a change in resonance capacitance of the resonance capacitor in the resonance frequency adjustment unit, a resonance frequency shift unit for shifting the resonance frequency of the non-contact wireless communication antenna, and on/off control unit for performing on/off control of the resonance frequency shift unit in accordance with the amount of change in resonance capacitance of the resonance capacitor by the capacitance variation control unit.