Reduced passband ladder type SAW impedance element filters on strong piezoelectric substrates

Author

Plessky, V.P. ; Kondratiev, S.N. ; Lambert, C.

Author_Institution

Micronas Semicond. SA, Bevaix, Switzerland

Volume

1

fYear

1996

fDate

3-6 Nov 1996

Firstpage

11

Abstract

Two ways of reducing coupling coefficient for 36-LiTaO₃ substrates are discussed: (1) a transducer with dummy electrodes and (2) an SiO₂ sublayer between the electrodes and the substrate. A theoretical coupling of modes (COM) model is used to find conditions for a twofold decrease of coupling. Experiments are made with test resonator-type structures for extraction of COM parameters and the obtained data are used for SAW duplexer design

Keywords

coupled mode analysis; ladder filters; lithium compounds; surface acoustic wave resonator filters; surface acoustic wave transducers; ultrasonic velocity; 36-LiTaO₃ substrates; LiTaO₃; SAW duplexer design; SAW propagation parameters; SiO₂; SiO₂ sublayer; coupling coefficient reduction; coupling of modes model; dummy electrodes; leaky SAW velocity; leaky wave substrate; reduced passband ladder type SAW impedance element filters; strong piezoelectric substrates; test resonator-type structures; transducer; twofold coupling decrease; Capacitance; Electrodes; Fingers; Impedance; Passband; Resonance; Resonator filters; Substrates; Surface acoustic waves; Transducers;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1996. Proceedings., 1996 IEEE

Conference_Location

San Antonio, TX

ISSN

1051-0117

Print_ISBN

0-7803-3615-1

Type

conf

DOI

10.1109/ULTSYM.1996.583770

Filename

583770