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A new RFID tag system has been designed by utilizing a reflective surface acoustic wave (SAW) delay line. A shear horizontal mode SAW (SH-SAW) has the unique characteristic of complete reflection at an edge normal to the direction of propagation. This characteristic makes it possible to construct a reflective delay line. The reflective delay line can be used to construct passive sensors that measure...
The propagation characteristics of a surface acoustic wave (SAW) that travels along the surface of a solid object can vary significantly depending on the surrounding environment. SAW devices are employed in sensors that measure many different kinds of environments and their changes. This paper discusses a SAW sensor used to measure the concentration of methanol, a fuel required by methanol fuel cells...
A new liquid sensor probe has been designed by using SH-SAW device. Shear horizontal mode surface acoustic wave (SH-SAW) has a unique characteristic of complete reflection at the free edges of the substrate. The SH-SAW are excited on a 36° YX LiTaO 3 and the right angle edge of the substrate has been used to reflect the SAW. Multi-channel reflecting SAW delay lines were constructed on the...
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