Title :
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
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;
Conference_Titel :
Ultrasonics Symposium, 1996. Proceedings., 1996 IEEE
Conference_Location :
San Antonio, TX
Print_ISBN :
0-7803-3615-1
DOI :
10.1109/ULTSYM.1996.583770
