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    Passive Environmental Sensing

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    8564435.pdf (435.5Kb)
    Date
    10/22/2013
    Author
    Durgin, Gregory David
    Peterson, Andrew F.
    Hason, Azhar
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    Abstract
    Various sensors, systems, and methods for monitoring environmental conditions are provided. In one embodiment, among others, a passive sensor includes an antenna; a modulating circuit coupled to the antenna by a microstrip transmission line, the modulating circuit capable of modulating a backscattered signal; a sensing material disposed between the microstrip transmission line and a ground plane of the passive sensor, where an electrical property of at least a portion of the sensing material varies with the environmental condition; and where the modulated backscattered signal includes at least one of phase and amplitude information corresponding to the electrical property of the portion of the sensing material.
    URI
    http://hdl.handle.net/1853/56819
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