Capacitive Loop Antenna for Wideband RFID Signal Processing
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Solution Overview
Problem
Existing transmission/reception devices for wireless communication media like RFID tags and contactless smart cards face challenges in achieving a wide frequency range without significant power loss and signal interference, as prior solutions involving resistors in the signal path lead to increased power consumption and signal processing issues.
Innovation Solution
A transmission/reception antenna design featuring a dielectric base board with an excitation loop antenna and a transmission/reception loop antenna in close proximity, connected by a resonance capacitor and a coupling capacitor, which enables magnetic induction and amplification of signals, expanding the frequency range while minimizing power consumption by avoiding resistors in the signal path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If resistors are provided in the transmission/reception signal path to expand frequency range, then the frequency range is widened, but power loss increases and power consumption becomes great
Solution Approach 1:
The invention removes resistors from the transmission/reception signal path entirely. Instead of using resistors to expand frequency range, the patent employs a capacitor-connected loop antenna structure that achieves wide frequency coverage without the power loss associated with resistive elements.
Solution Approach 2:
The invention changes the approach from resistive frequency tuning to capacitive-reactive frequency control. By using a capacitor connected to the loop antenna and adjusting its parameters, the system achieves wide frequency range without the energy dissipation inherent in resistive solutions.
2Power
If transmission signal intensity is increased to improve transmission, then transmission performance is improved, but the transmission signal prevents processing of normal reception signal
Solution Approach 1:
The invention separates the transmission and reception signal paths using directional coupling. The loop antenna structure with capacitor connection creates distinct signal paths that allow high-power transmission signals to be isolated from the sensitive reception processing circuitry, enabling both functions to operate simultaneously without interference.
Solution Approach 2:
The capacitor-connected loop antenna acts as an intermediary that couples transmission and reception functions while providing signal isolation. This intermediate structure allows energy transfer for transmission while preventing the high-intensity transmission signal from directly interfering with the reception processing unit.
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 allows for a wide frequency range with reduced power consumption and minimizes signal interference, enabling proper reception signal processing without increasing transmission power, thus enhancing communication performance.
Implementation Method 1
the transmission signal is transmitted from the excitation loop antenna to the transmission/reception loop antenna by magnetic induction
Implementation Method 2
a resonance capacitor connected between two ends of the transmission/reception loop antenna
Data Source
AI summary
A transmission/reception antenna and a transmission/reception device using the antenna wherein the antenna includes a dielectric base board, an excitation loop antenna provided on the dielectric base board, a transmission/reception loop antenna provided on the dielectric base board in close proximity of but not in contact with the excitation loop antenna, and a resonance capacitor connected between two ends of the transmission/reception loop antenna. A coupling capacitor is connected to one of the two ends of the transmission/reception loop antenna. The excitation loop antenna is connected to a transmitter, and the transmission/reception loop antenna is connected to the receptor via the coupling capacitor. Thereby, the frequency property may be expanded without increasing the power consumption, and the reception processing unit is enabled to properly process the reception signal.