International Symposium on Antennas and Propagation
Wristwatch-Type UWB Antenna for Wireless Body Area Network
Takuya Seki, Kazuyuki Saito, Masaharu Takahashi, Koichi Ito,
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In this paper, a wristwatch-type UWB antenna placed on an arm is proposed. The proposed antenna targets to operate in the band of 7.25 to 10.25 GHz . This band is approved as upper band of UWB in Japan, and it is not necessary to consider the detect and avoid (DAA) mechanism. This antenna is designed to propagate towards the tip of the arm for the communication with an external device located in its direction. Additionally, co-polarization of wearable antenna is vertical, because the vertical electric component to the arm is advanced to propagate along the surface of the arm . The planar monopole antenna, which radiates a vertical electric field, is suitable as a wearable antenna. However, the structure is large to be applied in practice. Wearable devices are required to be a miniature. Since the proposed antenna is small enough, it can be embedded in the wristwatch. In this paper, the characteristics of the proposed antenna are investigated when the antenna is placed on the arm. The voltage standing wave ratio (VSWR), the electric field distribution in near-field, and the radiation pattern in far-field of the antenna are calculated and measured.