Experimental results for quartz ST 300/spl deg/ versus quartz ST 25/spl deg/

This work presents experimental results comparing quartz ST 300/spl deg/ Natural Single Phase Unidirectional Transducer (NSPUDT) orientation (Euler angles: 0/spl deg/ 132.75/spl deg/ 300/spl deg/) with quartz ST 25/spl deg/ NSPUDT orientation (Euler angles: 0/spl deg/ 132.75/spl deg/ 25/spl deg/). The well-known quartz ST 25/spl deg/ 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/spl deg/ should have better directivity behavior, thus improved NSPUDT performance. The experimental results herein reported verify that the quartz ST 300/spl deg/ presents much higher directivity with respect to the 25/spl deg/ orientation, thus confirming with remarkable agreement previous theoretical predictions done by one of the authors.