Advanced Cavity Filter Tuning Methodology Using Photoconductive Polymers

点击翻译按钮获取中文摘要

Coaxial cavity filters, for RF front-ends operating in the 108-138 MHz band, selectively suppress interferingsignals and sideband noise of co-located transmitters on closely spaced receivers thus, protecting thecommunications from interference, false information, or noise. Commercially available devices aremechanically tuned. This project introduces a new electrical-based auto-tuned coaxial filter, which enables anefficient and automatic filtering functionality. The aim is to take advantage of deployed photoconductivepolymers that change their properties within the cavity filter in the presence of light; hence, switching theirstatus from dielectrics to good conductors. The designed high-Q prototype should meet desired specificationssuch as a temperature variation handling from -10 to +60 oC and an insertion loss less than 3 dB.