High-Q SAW grating resonators with tunabilities approaching 1% are possible on certain ferroelectric-ferroelastic crystals such as Gd2(MoO4)3. The resonant frequency is tuned by electronically varying the width of a small domain with different acoustic velocity within the resonator cavity. Experimental results at ∼92.6 MHz are presented.
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Coldren et al. (1978) studied this question.
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