A varactor-tuned RF filter

An electronically tunable filter at 1 GHz is presented in this paper. The f ilter uses a suspended substrate design and commercially available varactor s for filter tuning. The filter has a 60% tuning range from 700 MHz to 1.33 GHz with a Low insertion loss (better than 3 dB from 1 to 1.33 GHz). This paper discusses the effects of the varactor series resistance and the elect rical length of the distributed resonator on the overall resonator quality factor and filter insertion loss. The input third-order intermodulation pro duct intercept point was measured to be better than 17 dBm across the entir e tuning range.