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Analysis of a passive radio frequency excited acoustic transducer
Lejun Hu1, Charles Thompson1, Grace Remillard1
1Electrical and Computer Engineering Department, University of Massachusetts Lowell, Lowell, Massachusetts 01854, USA.
Abstract:
In this work, the physical processes that govern the operation of a passive acoustic transducer are analyzed and modeled. The wireless battery-free transducer derives its power from an externally applied electromagnetic field generated by a radio transmitter. The audio signal is encoded in the backscattered electromagnetic field. Electro-mechano-acoustical analogies are developed and presented. Power generation, sound transduction, and radio frequency backscatter transmission of the audio signal are analyzed. The resonant frequency of the passive acoustic transducer derived from this analysis is comparable to those reported in the literature.
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