부산대학교 도서관

Microwave resonators are used to measure the dielectric constant of material when feeding the microwave cavity with RF signals. Usually, the readout system is based on complex frequency-domain instrumentation or RF receivers. This paper shows how to realize a low-complexity system for measuring in the time-domain the RF signals needed to estimate the impedance of a microwave resonator. It is based on the conversion of the resonator output signal using a high-speed analog comparator. It uses the comparator binary output to estimate the full-resolution signal carrying information about the resonator frequency response function. Experimental results based on a third-harmonic resonator validate the made assumptions.