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This paper presents an analytical analysis and study of the propagation of Radio Frequency (RF) energy in muscle tissue. The workings of passive UHF RFID tag backscatter are studied. Backscatter field strength propagation models are used to describe the skin effect on muscle tissues. Energy dissipation and field intensities are studied for humans and larger vertebrates using a modified Friis propagation model for passive tag backscatter. An analytical evaluation is conducted for the electric field in muscle tissues for near-field distances.
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