The millimetre-wave band provides a few important advantages for body-centric communications. First of all, efficient high-gain antennas can be made sufficiently small to fit in small portable devices which can be worn on the body. Secondly, much more license-free bandwidth is available in this frequency band and, therefore, data transfers can be much faster. This allows for quick transfer of video streams and large data files between body-worn devices (e.g. a portable video player or smart phone and a head mounted display). Finally, since millimetre waves attenuate quickly with distance compared to the other, lower, frequencies employed by wireless body-area networks (WBAN), they produce less interference to the other WBANs in the vicinity and provide better security of the communication links by significantly reducing the chances of malicious eavesdropping. This feature of millimetre-wave links is of utmost importance for WBANs used by military and security forces. It also allows for a largely reduced probability of a WBAN, and hence the soldier wearing it, being detected by enemy forces and offers some other advantages in military applications [1].
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