STRIPLINE FILTER Russian patent published in 2005 - IPC

FIELD: microwave engineering.

SUBSTANCE: proposed stripline filter that incorporates provision for its tuning with respect to signal level, varying operating frequency band of filter, and gradually adjusting filter characteristics has insulating substrate one of whose sides carries conducting screen and other one, isolating capacitors, input and output arms with series-interconnected sections of strip lines inserted in-between through isolating capacitors, and open stubs connected to junction points of strip line sections. At least two stubs and active elements whose leads are coupled with stubs are connected to same section. Isolating capacitors are connected in series with stubs, electric length of stubs together with their series-connected isolating capacitors being shorter than that of strip line half-wave section and geometric length of stubs being shorter than that of strip line quarter-wavelength section. Stubs may be made in the form of strip line sections whose width is different both through stub length and between adjacent stubs. Active element may be in the form of p-i-n diode or microwave transistor. Active element leads are connected to stubs.

EFFECT: facilitated manufacture and adjustment of filter characteristics, reduced filter size.

7 cl, 3 dwg