摘要
Based on Chen-Haus ' theory~[1] , an experimental research on the reflection of SAW from a short-circuited Au -grating on YZ LiNbO3 and a short-circuited Al- recessed groove grating on ST-X quartz is first presented in this paper where an anomalous reflection phenomena existing in two gratings are confirmed. In addition, a residual reflection which couldn 't be completely cancelled by means of changing strip-thickness is pointed out for a short-circuited Au-grating on YZ LiNbO3 both experimentally and theoretically through extending Chen-Haus 'theory to anisotropic crystals.Finally, two kinds of IDT composed of single electrodes: Au-electrode on YZ LiNbO3 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 improvement in passband distortion and a potential usefulness of new structure in high frequency range.
Based on Chen-Haus ' theory~[1] , an experimental research on the reflection of SAW from a short-circuited Au -grating on YZ LiNbO3 and a short-circuited Al- recessed groove grating on ST-X quartz is first presented in this paper where an anomalous reflection phenomena existing in two gratings are confirmed. In addition, a residual reflection which couldn 't be completely cancelled by means of changing strip-thickness is pointed out for a short-circuited Au-grating on YZ LiNbO3 both experimentally and theoretically through extending Chen-Haus 'theory to anisotropic crystals.Finally, two kinds of IDT composed of single electrodes: Au-electrode on YZ LiNbO3 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 improvement in passband distortion and a potential usefulness of new structure in high frequency range.
