Advanced Cavity Filter Tuning Methodology Using Photoconductive Polymers

同轴腔体过滤器用于108-138 MHz频段的射频前端，选择性地抑制近距离接收器上同一位置发射机的干扰信号和边带噪声，从而保护通信免受干扰、虚假信息或噪声。商业上可以买到的设备都是机械调谐的。本项目介绍了一种新的基于电气的自动调谐同轴滤波器，它可以实现高效和自动的过滤功能。其目的是利用部署的光导聚合物，在光存在的情况下改变其在腔滤光器中的性质，从而将其状态从介电转换为良导体。所设计的高Q样机应满足预期的技术指标，如-10到+60oC的温度变化处理和小于3db的插入损耗。

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.