Title :
Low-Loss, Narrow-Band SAW Filters on Leaky Substrates
Author :
Meltaus, Johanna ; Holmgren, Olli ; Kokkonen, Kimmo ; Hong, Seong Su ; Plessky, Victor P.
Author_Institution :
Helsinki Univ. of Technol., Espoo
Abstract :
Surface acoustic wave filters operating at 1.6 GHz (GPS range) on 42deg-LiTaO3 are presented. The design is based on strong localized acoustical resonances appearing in gaps between long interdigital transducers. Realized low-loss filter has a fractional bandwidth of ~2% with a low insertion loss (~1 dB in the passband) and high rejection levels. We present also a switchable variant with response corresponding to that of two filter tracks connected electrically in series.
Keywords :
UHF filters; band-pass filters; lithium compounds; surface acoustic wave filters; LiTaO3; band-pass filters; frequency 1.6 GHz; interdigital transducers; leaky substrates; localized acoustical resonances; narrowband SAW filters; surface acoustic wave filters; Acoustic transducers; Acoustic waves; Band pass filters; Bandwidth; Global Positioning System; Insertion loss; Narrowband; Resonance; SAW filters; Surface acoustic waves; Surface acoustic waves; bandpass filters; surface acoustic wave filters;
Conference_Titel :
Microwave Symposium, 2007. IEEE/MTT-S International
Conference_Location :
Honolulu, HI
Print_ISBN :
1-4244-0688-9
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2007.380117
