BAND-PASS TUNABLE FILTER Russian patent published in 1994 - IPC

FIELD: radio engineering. SUBSTANCE: band-pass filter with electric tuning of frequency has resonance element based on ferrite and produced in the form of two rectangular metal-plated plates placed between screening surfaces of symmetric strip line, electromagnetic control system. It is supplemented with two rectangular dielectric plates, each coupled with butt to proper ferrite plate. Outer and inner surfaces of dielectric plates as well as outer and face surfaces of ferrite plates are metal-plated completely. Strips forming with inner metal plating of dielectric plates symmetric stepped conductor are applied to inner surfaces of ferrite plates. Wide part of conductor is capacitance and narrow part is inductance of resonance element. Input and output strips connection to transmission line are coupled in parallel to side edges of resonance element. EFFECT: improved operational characteristics. 4 dwg