Near-field wireless sensing of single and multiple open-ended micro coils

Abstract

Abstract. In this work we present near-field wireless sensing of single and multiple open-ended micro coils using an electrically small loop antenna. Wirelessly characterized parameters of open-ended micro coils include its resonance frequency, quality factor and inductance. Moreover a wireless frequency-dependent analytical model was developed. Micro coil inductance was extracted from the wirelessly measured signal using a constraint-based least-squares approach. Wireless measurements and analytical fit of micro coils are in strong agreement which validates the analytical model. Finite element method (FEM) simulations of the coupled system were done in COMSOL Multiphysics.

Multicarrier airborne ultrasound transmission with piezoelectric transducers

“…The manufacturer matches the transducer pair to achieve high power throughput; therefore, the parallel resonance of the receiver transducer (Ma40s4r) is close to the series resonance of the sender transducer (Ma40s4s). There are several ways reported frequently in literature for calculating the series and parallel resonances of the coupled resonators using the frequency dependent impedance response [19]. For this research work, we used the impedance minimum and maximum for computing the series and parallel resonant frequencies respectively.…”