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An electronically tunable filter at 1 GHz is presented. Thefilter uses a suspended substrate design and commercially available varactorsfor filter tuning. The filter has a 60% tuning range from 700 MHz to1.33 GHz with a low insertion loss (better than 3 dB from 1-1.33 GHz). Thispaper discusses the effects of the varactor series resistance and the electricallength of the distributed resonator on the overall resonator quality factorand filter insertion loss. The IIP3 (input 3rd order intermodulati
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