A compact-size rectangular slot antenna required for ultra-wide band body centric applications is presented. The antenna design is based on etching a rectangular slot on a circular radiator. The antenna is optimized using a surrogate assistance differential evolution algorithm to produce the largest bandwidth in free space and close to the human body. Analysis of the proposed antenna was carried out and its performance assess in terms of bandwidth, gain, efficiency, and radiation pattern.

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... s investigated shows that the rectangular slot antenna maintains its bandwidth when placed in closed contact with the human body. The very close agreement between the simulated and measured results both in free space and on body indicates that the antenna is immune to variation in the human tissues and also robust to fabrication tolerances.