Effect of body motion on propagation path gain at 60 GHz

Propagation between two antennas on a human body in millimeter-wave frequency band have been investigated empirically. Propagation characteristics of a number of on-body propagation channels were studied with two types of antennas: quarter-wavelength monopoles and rectangular horns, the first being representative of low-gain omnidirectional antennas and the latter being the high-gain directional antenna. The channel characteristics for the two types of the antennas were compared. The path gain of the links with the horn antennas was found to be higher the that for monopoles. However, the variability of the path gain was also much greater for some channels. The path gain variation with time was described by a two-scale statistical model in which short-term fading was found to follow approximately Cauchy-Lorentz probability distribution.