High performance balanced type SAW filters in the range of 900 MHz and 1.9 GHz

Author

Endoh, G. ; Ueda, M. ; Kawachi, O. ; Fujiwara, Y.

Author_Institution

Fujitsu Labs. Ltd., Kawasaki, Japan

Volume

1

fYear

1997

fDate

5-8 Oct 1997

Firstpage

41

Abstract

This paper describes balanced SAW filters with low insertion loss and high stopband rejection, which are applicable to 900 MHz and 1.9 GHz range portable telephone. The longitudinal coupled type double mode SAW design is suitable for balanced filter design. The 42 degree Y-X LiTaO ₃ substrate is chosen to get low insertion loss and high Q factor performances. The design and evaluation method are studied and the effect of phase difference between balanced terminal signals is shown. The new filter design makes it possible to convert input/output impedance in order to match to an IC impedance

Keywords

Q-factor; UHF filters; cellular radio; lithium compounds; losses; surface acoustic wave filters; 900 MHz to 1.9 GHz; IC impedance; LiTaO₃; LiTaO₃ substrate; balanced SAW filters; balanced filter design; balanced terminal signals; filter design; high Q factor; high performance balanced type SAW filters; high stopband rejection; input/output impedance; longitudinal coupled type double mode SAW design; low insertion loss; phase difference; portable telephone; Circuits; GSM; Impedance; Insertion loss; Personal communication networks; Q factor; SAW filters; Signal design; Surface acoustic waves; Ultrasonic variables measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1997. Proceedings., 1997 IEEE

Conference_Location

Toronto, Ont.

ISSN

1051-0117

Print_ISBN

0-7803-4153-8

Type

conf

DOI

10.1109/ULTSYM.1997.662976

Filename

662976