HIGHLY SELECTIVE TUNABLE LC BANDPASS FILTER Russian patent published in 2014 - IPC H03H9/00 

FIELD: radio engineering, communication.

SUBSTANCE: highly selective tunable LC bandpass filter has in the longitudinal branch a first capacitor connected to a first inductance coil, second and third inductance coils, a second capacitor and a third inductance coil, fourth, fifth, sixth, seventh and eighth inductance coils, first, second and third signal lines, first and second groups of capacitors; the first signal line is connected to the first group of capacitors; the second lead of each of said capacitors is connected through a corresponding electronic switch to a second signal line; the first leads of the second group of capacitors are connected to a common bus; the second lead of each of said capacitors is connected through a corresponding electronic switch to a third signal line.

EFFECT: improved electrical parameters of the filter: high squareness ratio of the amplitude-frequency characteristic and attenuation in the stop band, broader functional capabilities by enabling filter tuning.

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