Abstract
AbstractA microwave pressure sensor based on variations in the transmission zero of a microstrip circuit is proposed in this article. The structure of the sensor is consisting of a microstrip line connected in parallel to a single stub, which the stub is terminated in a reactive load. When the length of stub is around quarter‐wavelength, the frequency of the transmission zero of microstrip line can be controlled by the reactance value. Therefore, by using a simple parallel plate capacitor as a transducer in which its capacitance is changed by the pressure, a microwave pressure sensor is realized. A prototype pressure sensor by using a circular‐shape parallel plate capacitor is designed and fabricated that the measurement results show a good linear variation of transmission zero with pressure with sensitivity of −0.57 MHz/kPa when the pressure changes from 0 to 466 kPa.
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