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Multi-Transit Echo Suppression For Passive Wireless Surface Acoustic Wave Sensors Using 3rd Harmonic Unidirectional Transducers And Walsh-Hadamard-Like Reflectors, Luis Manuel Rodriguez Cordoves

Electronic Theses and Dissertations

A passive wireless surface acoustic wave sensor of a delay-line type is composed of an antenna, a transducer that converts the EM signal into a surface acoustic wave, and a set of acoustic reflectors that reflect the incoming signal back out through the antenna. A cavity forms between the transducer and the reflectors, trapping energy and causing multiple unwanted echoes. The work in this dissertation aims to reduce the unwanted echoes so that only the main transit signal is left--the signal of interest with sensor information. The contributions of this dissertation include reflective delay-line device response in the form of …