MICROSTRIP FILTER Russian patent published in 2005 - IPC

FIELD: microwave engineering.

SUBSTANCE: proposed microstrip 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 microstrip lines inserted in-between through isolating capacitors, and open stubs connected to junction points of microstrip line sections. At least two stubs and active elements whose leads are coupled with stubs are connected to same section. Stubs may be made in the form of microstrip line sections whose width is different both through stub length and between adjacent stubs. Leads of active elements may be connected to stubs at distance equal in electric length from junction section for leads relevant to same active element and different for those relevant to different active elements. Electric length of isolating capacitor between adjacent stubs may be equal to that of even number of quarter-wavelength sections of microstrip line.

EFFECT: facilitated manufacture and adjustment of filter characteristics.

6 cl, 3 dwg