Title :
P5I-2 Lower-Loss Filters on Langasite
Author :
Makarov, V.M. ; Ivanov, P.G. ; Dai, J.
Author_Institution :
Moscow Eng.-Phys. Inst., Moscow
Abstract :
The advantages of langasite as a substrate material for SAW filters are not realized entirely till now because of the natural unidirectivity of most cuts available for practical applications. This paper presents new results that allow the utilization of langasite for SAW filters. The mathematic model, SPUDT cell structures and design method were developed for naturally unidirectional orientations. This approach allows designs of slanted and RSPUDT filters on yxlt/48.5726.6deg langasite with 7 dB - 10 dB insertion losses and bandwidths 1% - 3%.
Keywords :
gallium compounds; lanthanum compounds; substrates; surface acoustic wave filters; surface acoustic wave transducers; La3Ga5SiO14; RSPUDT filters; SAW filters; insertion losses; langasite; loss 7 dB to 10 dB; low-loss filters; single phase unidirectional transducers; slanted filters; substrate material; unidirectional orientation; Acoustic transducers; Circuit simulation; Equivalent circuits; Fingers; Optical films; Reflection; Resonator filters; SAW filters; Transformers; Ultrasonic transducers;
Conference_Titel :
Ultrasonics Symposium, 2007. IEEE
Conference_Location :
New York, NY
Print_ISBN :
978-1-4244-1384-3
Electronic_ISBN :
1051-0117
DOI :
10.1109/ULTSYM.2007.593
