BROAD BAND PIEZOELECTRIC FILTER Russian patent published in 2008 - IPC H03H9/54 

FIELD: radio electronics.

SUBSTANCE: invention pertains to radio electronics and can be used for frequency selection of signals. The broad band piezoelectric filter has a piezoelectric resonator with a capacitor connected to it in parallel. A second capacitor is connected to the first terminal of the piezoelectric resonator, the second terminal of which is connected to the common bus. A third capacitor is connected the second terminal of the piezoelectric resonator, the second terminal of which is connected to the common bus. The circuit of the filter has an extra fourth and fifth capacitor and a first and second inductor coil. The fourth capacitor and the first inductor coil are connected between the first terminal of the piezoelectric resonator and the input potential terminal of the filter. The fifth capacitor and the second inductor coil are connected between the second terminal of the piezoelectric resonator and the output potential terminal of the filter.

EFFECT: wider band pass and matching with the loads, with a wide range of values.

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