PIEZOELECTRIC FILTER Russian patent published in 2009 - IPC H03H7/01 H03H9/54 

FIELD: radio engineering.

SUBSTANCE: filter includes input differential transformer to each output of differential winding of which the first output of piezoelectric resonator is connected, second outputs of piezoelectric resonators are connected in pairs and connected to potential output of two-terminal circuit containing in-parallel connected inductance coil and capacitor, output differential transformer, by which to each output of differential winding there connected is the first output of piezoelectric resonator, second outputs of piezoelectric resonators are joint in pairs and connected to potential output of two-terminal circuit, middle outputs of differential windings and low potential output of two-terminal circuit are connected to common bus, in addition, it contains M pairs of input piezoelectric resonators, M two-terminal circuits and M pairs of output piezoelectric resonators; at that, first outputs of piezoelectric resonators of each input pair are connected to outputs of differential winding of input transformer, and second ones are connected in pairs and connected to potential output of additional two-terminal circuit accordingly, the first outputs of piezoelectric resonators of each output pair are connected to outputs of differential winding of output transformer, the second outputs are connected in pairs and connected to potential output of additional two-terminal circuit accordingly.

EFFECT: enlarging functional capabilities.

1 dwg