Electronically Tunable High-Power Filter for Interference Reduction in Air Force Communication Systems.

Abstract : A novel, high-Q, high-power VHF/UHF bandpass filter is described that is electronically tuned according to a binary logic. A high-Q, TEM-line resonator is distributively loaded with N independent capacitive irises, such that the opening and closing of switches within each iris makes its capacitance two-valued. Mathematical modeling and design relations were developed and a working, 512-channel (9 iris) bandpass filter was completed for the range 194 to 359MHz.