Title :
Wideband three-transducer SAW filters using unidirectional IDTs on U-shaped MSCs with insertion loss of 1 dB
Author :
Doberstein, S. ; Malyukhov, V. ; Razgonyaev, V.
Author_Institution :
ONIIP, Omsk, Russia
Abstract :
This paper presents wideband three-transducer SAW filters using unidirectional IDTs on U-shaped MSCs. In the filters a self-matching effect is used when a static capacitance of an IDT is compensated by an acoustic radiation susceptance. 30-70 MHz filters on 128° YX, 64° YX, 41° YX LiNbO3 have shown an insertion loss of 1 dB, 3-dB fractional bandwidth of 3.5-10% with low ripple of 0.1 dB, stopband attenuation of 10-15 dB. 165, 169 MHz SAW filters for the front-end stages of mobile transceivers have shown an insertion loss of 1-1.8 dB, 3-dB bandwidth of 5.7-11 MHz with a ripple of 0.2 dB, stopband attenuation of 12-40 dB. The filters did not require matching networks, were mounted in the SMD packages (5×5×1.8 mm).
Keywords :
interdigital transducers; surface acoustic wave filters; surface acoustic wave transducers; 1 dB; 1 to 1.8 dB; 165 MHz; 169 MHz; 30 to 70 MHz; 5.7 to 11 MHz; LiNbO3; LiNbO3 substrate; SMD package; U-shaped MSC; acoustic radiation susceptance; fractional bandwidth; insertion loss; mobile transceiver front-end; ripple; self-matching; static capacitance; stopband attenuation; three-transducer SAW filter; unidirectional IDT; Attenuation; Bandwidth; Electrodes; Insertion loss; Matched filters; Propagation losses; SAW filters; Surface acoustic waves; Transducers; Wideband;
Conference_Titel :
Ultrasonics Symposium, 1999. Proceedings. 1999 IEEE
Conference_Location :
Caesars Tahoe, NV
Print_ISBN :
0-7803-5722-1
DOI :
10.1109/ULTSYM.1999.849352
