Wideband low loss SAW filters for telecommunication and mobile radio applications

Author

Ivanov, P.G. ; Makarov, V.M. ; Orlov, V.S. ; Shvetts, V.B.

Author_Institution

Moscow Radiocommun. Res. Inst., Russia

Volume

1

fYear

1996

fDate

3-6 Nov 1996

Firstpage

61

Abstract

The possibility of utilizing cuts of LiNbO₃ with high piezoelectric coupling for leaky waves-41°-YX and 49°-YX-in wideband SAW filters, has been demonstrated. The equivalent circuit model was modified for longitudinally coupled resonator filters and some second-order effects have been taken into account to improve the accuracy of filter simulation. Thick Al electrodes are used to increase the effective electromechanical coupling. Spurious SAW signals are suppressed by the frequency shift between filter cascades. Low-loss (2-3 dB) two-cascade filters with bandwidths 6-7% and high sidelobe suppression (60 dB), more typical for three-cascade filters, were designed and manufactured

Keywords

equivalent circuits; land mobile radio; lithium compounds; surface acoustic wave resonator filters; 2 to 3 dB; Al; Al electrode; LiNbO₃; electromechanical coupling; equivalent circuit model; leaky wave; longitudinally coupled resonator filter; mobile radio; piezoelectric coupling; second-order effect; sidelobe suppression; simulation; telecommunication; two-cascade filter; wideband low loss SAW filter; Bandwidth; Circuit simulation; Coupling circuits; Electrodes; Equivalent circuits; Frequency; Resonator filters; SAW filters; Surface acoustic waves; Wideband;

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.1996.583793

Filename

583793