Guest Editorial for the Special Issue on Antennas and Propagation on Body-Centric Wireless Communications

The topic of body centric communications can be divided into three domains: (1) Communications from the body surface to a nearby base station; (2) both antennas are on the body surface; and (3) at least one antenna may be in a medical implant within the body. These three domains have been called off-body, on-body and in-body, respectively. The classification serves to highlight some of the technical challenges. They may also be encountered by the reader in some of the papers in this Special Issue. However the papers in the Issue have not been arranged in this way but rather in terms of the main topic, namely antennas and propagation.