MONOLITHIC CRYSTAL FILTER Russian patent published in 1997 - IPC

FIELD: radio electronics; development of signal frequency selecting devices. SUBSTANCE: filter has piezoelectric plate 1 of lanthanum-helium silicate, two pairs of overlapping exciting electrodes 2,3 and 4,5, and leads 6. Higher frequencies are increased by selecting length L_x and area S of exciting electrodes from equations , where H is thickness of piezoelectric plate. Side passband level is reduced by turning piezoelectric plate about normal to main edge within 15 deg. EFFECT: extended frequency range towards higher frequencies. 3 cl, 4 dwg