A passive surface acoustic wave (SAW) pressure sensor was developed for real-time\npressure monitoring in downhole application. The passive pressure sensor consists of a SAW\nresonator, which is attached to a circular metal diaphragm used as a pressure transducer. While the\nmembrane deflects as a function of pressure applied, the frequency response changes due to the\nvariation of the SAWpropagation parameters. The sensitivity and linearity of the SAWpressure sensor\nwere measured to be 8.3 kHz/bar and 0.999, respectively. The experimental results were validated\nwith a hybrid analyticalââ?¬â??numerical analysis. The good results combined with the robust design and\npackaging for harsh environment demonstrated it to be a promising sensor for industrial applications.
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