BANDPASS ALL-PASS RETUNABLE SHF FILTER Russian patent published in 2009 - IPC H01P1/203 

FIELD: radio engineering.

SUBSTANCE: proposed device comprises two transmission lines (TL) with identical wave resistances, one intended for SHF signal input and the other one intended for SHF signal output, and at least one resonance component (RC) with solid-state device to receive constant control voltage. Every RC comprises second solid-state device and TL three sections. First section features length equal to wavelength 1/8th and less, and wave resistance equal to that of TL at input. Second and third sections feature length equal to 1/4^th of wavelength. Solid-stare devices represent filed transistors with Schottky barrier. Proposed device comprises also TL section with length equal to 1/8^th of wavelength and less, and wave length equal to TL wave length at input. First TL section is connected with TL ends at input and output, or in cascade with the help of aforesaid TL section, while second and third T: sections are connected to first section and drains of first and second field transistors with Schottky barrier. Note that gates of aforesaid transistors are interconnected and connected to constant control voltage source, while their drains are connected to the ground.

EFFECT: expanded performances, lower losses.

3 dwg