Experimental results for quartz ST 300° versus quartz ST 25°

This work presents experimental results comparing quartz ST 300° Natural Single Phase Unidirectional Transducer (NSPUDT) orientation (Euler angles: 0° 132.75° 300°) with quartz ST 25° NSPUDT orientation (Euler angles: 0° 132.75° 25°). The well-known quartz ST 25° is a largely used Surface Acoustic Wave (SAW) orientation for low loss, high performance consumer and communication SAW filters, required in modern wireless communication, and remote control equipment. A method of searching for NSPUDT orientations, devised by one of the authors in a previous publication, suggested that quartz ST 300° should have better directivity behavior, thus improved NSPUDT performance. The experimental results herein reported verify that the quartz ST 300° presents much higher directivity with respect to the 25° orientation, thus confirming with remarkable agreement previous theoretical predictions done by one of the authors