SURFACE-ACOUSTIC-WAVE REJECTION FILTER Russian patent published in 2002 - IPC

Abstract RU 2195071 C1

FIELD: radio electronics; surface-acoustic-wave devices for frequency selection. SUBSTANCE: equidistant interdigital transducer is mounted on working surface of piezoelectric acoustic duct. Inductance coil is connected in parallel with interdigital transducer, its center tap being electrically connected to one of capacitor plates and inductance coil leads, to first input and output terminals. Other capacitor plate is connected to other input and output terminals. Additional resistor is connected in series or in parallel with capacitor. Antipodal electrodes are overlapped in two equal- aperture sections of interdigital transducer with different coefficients of metallization and additional resistor value is chosen to ensure voltage correction across device. EFFECT: enhanced rejection percentage and band. 2 dwg

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RU 2 195 071 C1

Authors

Bagdasarjan N.A.

Bagdasarjan A.S.

Kondrat'Ev S.N.

Semenov V.V.

Averkin S.V.

Dates

2002-12-20—Published

2002-04-12—Filed