Abstract
This paper describes a super high electromechanical coupling SAW propagating on potassium ruobate (KNbO 3 ) substrate and its applications for low-loss, wide band and temperature stable SAW filters. KNbO 3 has large piezoelectric constants. We obtained the electromechanical coupling coefficient (K 2 ) of 0.53 for SAW in Y-cut X-propagating substrate theoretically and experimentally. It is about 10 times as large as that in LiNbO 3 . Moreover, we obtained a zero temperature characteristics around room temperature in rotated Y cut substrate. Experimental results of wide band SAW filters show low loss and temperature stable characteristics. The bandwidth is about 20% and insertion losses are less than 2∼6 dB.
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