Autonomous RF Cavity Filter Tuning

Abstract

The growth and progress in the radar systems, electronic warfare, and telecommunication industry emerges a big demand for microwave filters. Cavity filters are conventionally used in transmitters and receivers to allow the desired signals in passband while rejecting the harmonics and spurious signal out of the band. The idea behind a cavity filter is that each resonator, which is mounted perpendicular to the length of the cavity block with designed spacing and centered to the width of the cavity, is tuned to the center frequency of the band pass filter by using its resonator and distributed capacitance.