NARROW-BAND TUNABLE LC-FILTER Russian patent published in 2012 - IPC H03H7/01 

FIELD: physics.

SUBSTANCE: narrow-band tunable LC-filter comprises first to fourth inductance coils, first to third capacitors, first to eighth electronic switches, two groups of double-winding transformers, M capacitive sections of an identical structure, each having fourth to sixth capacitors, ninth and tenth electronic switches.

EFFECT: wider range of tuning the filter and improved squareness ratio of its amplitude-frequency characteristic for fixed load equivalents and one discrete variable capacitor.

3 cl, 3 dwg