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This paper describes how the characteristics of shear-horizontal type piezoelectric boundary acoustic waves (PBAWs) change with combination of different overlay and metal grating materials. It is shown that PBAWs are supported in various structures provided that highly piezoelectric material(s) are employed as structural member(s). For verification, numerical simulation of different material combinations...
This paper describes how the propagation characteristics of shear-horizontal (SH) type piezoelectric boundary acoustic waves (PBAWs) change with overlay and metallic grating materials. We theoretically investigated the PBAW characteristics for various combinations of the overlay and metallic grating materials, and attempted to validate the qualitative prediction previously discussed and find the possible...
This paper describes the development of extremely wideband and very low-loss RF SAW filters of ladder type for future communication systems. Because of its large electromechanical coupling factor for SH-type SAWs, a Cu-grating/15degYX-LiNbO3 structure was employed as a substrate. At first, four-stage ladder type filter was designed and fabricated, where width/length weighted dummy electrodes were...
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