TUNABLE BAND-PASS LC-FILTER Russian patent published in 2014 - IPC H03H9/46 H03H7/12 

FIELD: radio engineering, communication.

SUBSTANCE: tunable band-pass LC-filter comprises a low-pass filter which consists of first, second and third inductance coils, a first capacitor, a band-pass circuit consisting of a fourth inductance coil, a fifth inductance coil, a sixth inductance coil, a second capacitor which is connected to the output of the band-pass circuit, as well as a seventh and eight inductance coil, first and second varicaps, wherein the seventh inductance coil is connected by one terminal to the input potential terminal, and by the second terminal to a common bus, the eight inductance coil is connected to the output of a low-pass filter, the second terminal of which is connected to the output potential terminal of the device, the first varicap is connected in parallel to the first capacitor, the second varicap is connected in parallel to the second capacitor.

EFFECT: high selectivity and broader functional capabilities by enabling frequency tuning.

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