Characterization of Passive Circuit Element Using Resonant Circuit Technique for Wireless Communication Applications

This article discusses a method for non-contact measurement of passive components-resistors, inductors, and capacitors-under DC biasing conditions. It utilizes resonant circuits to selectively identify high-frequency components. By varying one component (inductance, capacitance, or resistance), the resonant frequency changes, which is derived from the relationship between coil characterization and the frequency of the generated sinusoidal wave. The measurement involves sending an input signal through one inductive coupling and receiving it through another. This technique allows for monitoring the maximum operating frequency, voltage, and passive element values, ensuring optimal energy and power transfer. Simulation results demonstrated an efficacy of over <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mathbf{9 2 \%}$</tex> for the compensation circuit, with a total harmonic distortion of only 0.20 %, making it suitable for inductive wireless transmission applications. To validate the technique, simulations were conducted at various power levels, confirming its effectiveness in achieving optimal energy and power transfer. The results align with traditional measurement methods, indicating reliability. This approach could have practical applications, such as in inductive pressure sensors, where changes in resonant frequency are useful.