LC dual-parameter coplanar coil decoupling method based on reverse adjacent coil structure design

Abstract

In LC multi-parameter sensors, coil mutual inductance induces crosstalk, causing resonant shifts and signal interference. This study proposes a reverse adjacent coil structure that generates opposing magnetic fields to suppress mutual inductance and reduce crosstalk. A theoretical coplanar inductance model was established, with a derived mutual inductance formula and applicable conditions. Coplanar inductor behavior was analyzed via HFSS simulations, and two LC circuits were constructed to examine dual-resonant interactions. Experiments validated the model by varying two capacitor values and fabricating capacitive sensors. This passive method preserves signal independence and accuracy while reducing complexity. It is well-suited for thin-film wireless sensing, enabling precise and reliable synchronous measurements.