Theoretical and experimental results of arbitrary bandwidth ladder type SAW filters with super high coupling substrates and 1dB insertion loss filters with new unidirectional interdigital transducers at 2GHz-range

Author

Yamanouchi, Kazuhiko ; Satoh, Y. ; Kawasaki, Daichi

Author_Institution

Tohoku Inst. of Technol., Sendai, Japan

fYear

2005

fDate

12-17 June 2005

Abstract

We show ladder type SAW resonator filters using high coupling SiO₂/5°Y-X LiNbO₃ with zero temperature coefficients of frequency (TCF). The experimental results showed below 1.6dB insertion loss with a wide band and zero TCF at 2GHz-range. Also we show the arbitrary band width of ladder type filters using new configuration of IDTs and reflectors on high coupling substrates. We also proposed a single phase unidirectional transducer (UDT) with about λ/4 electrode width of the best transducer efficiency. The UDTs are obtained by IDT on the very thin dielectric grating with λ/8 shifts. In this paper, we describe the experimental results of wide band and very low loss UDT filters with below 1dB insertion loss at 2GHz-range.

Keywords

UHF filters; interdigital transducers; ladder filters; lithium compounds; niobium compounds; silicon compounds; surface acoustic wave resonator filters; 1 dB; 2 GHz; SAW resonator filters; SiO₂-LiNbO₃; UDT filters; arbitrary bandwidth SAW filters; ladder type SAW filters; low insertion loss filter; single phase unidirectional interdigital transducers; super high coupling substrates; surface acoustic wave filters; thin dielectric gratings; wideband filters; zero temperature coefficients of frequency; Bandwidth; Dielectric substrates; Frequency; Insertion loss; Resonator filters; SAW filters; Surface acoustic waves; Temperature; Transducers; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 2005 IEEE MTT-S International

ISSN

01490-645X

Print_ISBN

0-7803-8845-3

Type

conf

DOI

10.1109/MWSYM.2005.1516619

Filename

1516619