Title :
SAW filter based on parallel-connected CRFs with offset frequencies
Author :
Meltaus, J. ; Plessky, V.P. ; Gortchakov, A. ; Härmä, S. ; Salomaa, M.M.
Author_Institution :
Mater. Phys. Lab., Helsinki Univ. of Technol., Finland
Abstract :
We present designs for two-track devices, based on the coupled resonator filter (CRF) concept, having either two or three transducers. The tracks are connected in parallel, imposing a frequency shift between them. Examples of this approach are demonstrated in different frequency ranges, both on quartz and - for the first time - on 42°-LiTaO3. We also introduce a parallel-track design with distributed gaps. The device can also operate as a single-to-balanced (BALUN) transformer.
Keywords :
baluns; lithium compounds; resonator filters; silicon compounds; surface acoustic wave filters; transducers; LiTaO3; SAW filter; SiO2; balun transformer; coupled resonator filter; offset frequencies; parallel-connected CRF; parallel-track design; quartz; single-to-balanced transformer; transducer; Apertures; Bandwidth; Frequency; Insertion loss; Laboratories; Passband; Physics; Resonator filters; SAW filters; Transducers;
Conference_Titel :
Ultrasonics, 2003 IEEE Symposium on
Print_ISBN :
0-7803-7922-5
DOI :
10.1109/ULTSYM.2003.1293327
