Antennas and propagation for on-body communication systems

Studies on the narrowband characterization of the on-body propagation channel show variations of up to 40dB in link loss for different antenna position and body posture. Channels on the body trunk show small variance of the path gain probability density function, whilst those involving the arms or legs a much greater variance. For most cases the monopole antenna located with the ground plane parallel to the body surface give least loss. For ultra wideband channels, path delay is highest for non line of sight links around the body and delay spreads are generally less than 10nsec. Link modeling using a free space assumption gives results within 10dB, but for more accurate modeling full body modeling is required and an example is given using locally distorted non-orthogonal FD-TD.

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