MONOLITHIC QUARTZ FILTER Russian patent published in 2008 - IPC H03H9/22 H03H9/54 

FIELD: electrical engineering.

SUBSTANCE: invention is related to piezo-equipment and may be used for production of monolithic filters. Monolithic quartz filter contains quartz piezoelectric cell with inverted mesa structure of AT-cut (yx1/+35°), two electrodes that are installed symmetrically in respect to each other on one of the sides of piezoelectric cell and electrodes on the opposite side. Electrodes of point resonators are installed on the first working side of piezoelectric cell, arranged in the form of ellipses, the axles of which are oriented in respect to crystallographic axes of crystalline element. Small diameters of ellipses are installed along crystallographic axis ZZ', on the opposite side of piezoelectric cell the second pair of electrodes is installed, arranged symmetrically to the first one.

EFFECT: obtaining of required bandlimitedness, increase of energy capture level in sub-electronic field of point resonators, improvement of sorted signal quality at the account of galvanic isolation of signal source and receiver, reduction of phase noises.

2 dwg