Title :
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
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;
Conference_Titel :
Microwave Symposium Digest, 2005 IEEE MTT-S International
Print_ISBN :
0-7803-8845-3
DOI :
10.1109/MWSYM.2005.1516619
