SURFACE ACOUSTIC-WAVE DEVICE Russian patent published in 2004 - IPC

FIELD: radio electronics; acoustoelectronic acoustic-surface-wave frequency selectors.

SUBSTANCE: device has two input and two output terminals and piezoelectric acoustic duct carrying on its working edge first and second interdigital electrode sets whose single-phase electrodes are interconnected by means of first, second, and common power buses. Device also has additional interdigital transducer whose first bus is electrically connected to first input and first output terminals and its second bus is connected to common power bus. Second input and second output terminals are connected to first and second power buses. Electrode number for additional interdigital transducer, period and aperture for first and second interdigital transducers are chosen to ensure that inductive reactances of additional interdigital transducer and capacitive reactances of first and second interdigital transducers will provide for matching input and output impedances. Such layout structure will enable reduction of insertion loss to a level of 1 - 2 dB.

EFFECT: reduced insertion loss without increasing size of device.

1 cl, 2 dwg