Title :
Wideband low loss SAW filters for telecommunication and mobile radio applications
Author :
Ivanov, P.G. ; Makarov, V.M. ; Orlov, V.S. ; Shvetts, V.B.
Author_Institution :
Moscow Radiocommun. Res. Inst., Russia
Abstract :
The possibility of utilizing cuts of LiNbO3 with high piezoelectric coupling for leaky waves-41°-YX and 49°-YX-in wideband SAW filters, has been demonstrated. The equivalent circuit model was modified for longitudinally coupled resonator filters and some second-order effects have been taken into account to improve the accuracy of filter simulation. Thick Al electrodes are used to increase the effective electromechanical coupling. Spurious SAW signals are suppressed by the frequency shift between filter cascades. Low-loss (2-3 dB) two-cascade filters with bandwidths 6-7% and high sidelobe suppression (60 dB), more typical for three-cascade filters, were designed and manufactured
Keywords :
equivalent circuits; land mobile radio; lithium compounds; surface acoustic wave resonator filters; 2 to 3 dB; Al; Al electrode; LiNbO3; electromechanical coupling; equivalent circuit model; leaky wave; longitudinally coupled resonator filter; mobile radio; piezoelectric coupling; second-order effect; sidelobe suppression; simulation; telecommunication; two-cascade filter; wideband low loss SAW filter; Bandwidth; Circuit simulation; Coupling circuits; Electrodes; Equivalent circuits; Frequency; Resonator filters; SAW filters; Surface acoustic waves; Wideband;
Conference_Titel :
Ultrasonics Symposium, 1996. Proceedings., 1996 IEEE
Conference_Location :
San Antonio, TX
Print_ISBN :
0-7803-3615-1
DOI :
10.1109/ULTSYM.1996.583793
