BROADBAND PIEZO ELECTRIC FILTER WITH COMPLEX LOADS Russian patent published in 2008 - IPC H03H9/54 

FIELD: physics, radio.

SUBSTANCE: invention concerns radio electronics and can be applied in signal frequency selection. The objective is achieved by the use of broadband piezo electric filters with complex loads, which include piezo electric resonator with connected parallel inductance coil and condenser. First piezo resonator output is connected to second inductance coil and second condenser, with second outputs of both connected to the common bus. Second piezo resonator output is connected to third conductance coil and third condenser, with second outputs of both connected to the common bus. Fourth, fifth, sixth and seventh condensers are added, so that fourth condenser is installed between first piezo resonator output and potential input terminal of filter, fifth condenser is installed between potential input terminal of filter and the common bus, sixth condenser is installed between second piezo resonator output and potential output terminal of filter, and seventh condenser is installed between potential output terminal of filter and the common bus.

EFFECT: improved filter properties in stop band and pass band in various operation conditions.

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