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This communication addresses power issues at physical layer in Body Area Networks. Friis equation is discussed by taking into account body path loss and antenna efficiency from frequency ranging from 400 MHz to 60 GHz. Then power balance is presented for fixed antenna dimensions and varying frequency in order to establish a balance.
The propagation of 60 GHz electromagnetic waves around a human body is studied. The body is treated as a circular cylinder. Analytic formulations based on creeping wave theory for both vertical and horizontal polarizations are given. Measurements conducted on a brass cylinder confirmed theoretical results.
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