| 摘 要： | Based on Chen-Haus′theory,an experimental research on the reflection of SAW from ashort-circuited Au-grating on YZ LiNbO_3 and a short-circuited Al-recessed groove grating on ST-Xquartz is first presented in this paper where an anomalous reflection phenomena existing in two gratings areconfirmed.In addition,a residual reflection which couldn′t be completely cancelled by means of changingstrip-thickness is pointed out for a short-circuited Au-grating on YZ LiNbO_3 both experimentally andtheoretically through extending Chen-Haus′theory to anisotropic crystals.Finally.two kinds of IDT composed of single electrodes:Au-electrode on YZ LiNbO_3 and Al-recessed-groove-electrode on ST-X quartz,are proposed for high internal reflection suppression.The experimental results of bandpass filters constructed with the IDTs mentioned above show a great im-provement in passband distortion and a potential usefulness of new structure in high frequency range.
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