NARROW-BAND FILTER Russian patent published in 2011 - IPC H01P1/00 

FIELD: physics.

SUBSTANCE: narrow-band filter has two oscillatory circuits and a coupling capacitor. In the first oscillatory circuit, the first lead of the first inductance coil is connected to the common housing, and the second lead of the first inductance coil is connected to the input of the filter, the first lead of the second inductance coil is connected to the input of the filter, and the second lead of the second inductance coil is connected to the first lead of the capacitor, whose second lead is connected to the common housing. In the second oscillatory circuit, the first lead of the inductance coil is connected to the output of the filter and the second lead of the inductance coil is connected to the first lead of the first capacitor of the second oscillatory circuit, whose second lead is connected to the common housing. The first lead of the second capacitor of the second oscillatory circuit is connected to the output of the filter, whose second lead is connected to the common housing. The coupling capacitor of the oscillatory circuits is connected between the input and the output of the filter.

EFFECT: high slope gradient of the filter frequency response.

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