PIEZOELECTRIC BAND FILTER Russian patent published in 2012 - IPC H03H9/54 H01L41/107 

FIELD: electricity.

SUBSTANCE: filter comprises two piezoelectric resonators, four capacitors, two inductance coils. The first outputs of the first and second capacitors are connected to each other and connected to the first output of the first piezoelectric resonator, the second output of which is connected to the common bus. The second piezoelectric resonator with its outputs is connected to the second outputs of the first and second capacitors. The third capacitor and the first inductance coil, the second output of which is the input potential terminal of the filter are connected to the second output of the first capacitor. The fourth capacitor and the second inductance coil, the second output of which is the output potential terminal of the filter are connected to the second output of the second capacitor. The second outputs of the third and fourth capacitors are connected to the common bus.

EFFECT: invention provides for a symmetrical amplitude-frequency characteristic of the filter and expanded bandwidth.

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