In the last few years, the research on body-centric wireless communications (BCWCs) is becoming very hot, because of numerous applications, such as, E-health systems, security agencies, and personal entertainment [1–2]. Especially, many researchers considered E-health systems as the biggest potential application with all kinds of wireless devices. The well-known requirements for wearable antennas in body-centric wireless communications area are compact size, light weight, low-profile, and lower specific absorption rate (SAR). Planar inverted-F antennas in [3–4] are good candidates for BCWCs, because the radiation toward the human body is reduced by using the large ground plane. However, their volume is still larger than our proposed antenna.
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