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New approach for the design of UWB monopoles with directive radiation for BAN applications

Abstract:

One of the most relevant challenges of next generation in-body devices consist in enhancing the medical applications of wireless networks qualitatively. The quality and the performance of the telecommunications in BAN systems are next challenge presented for the new generation of recharges. High data rate and high power systems are not allowed around the body for many reasons, therefore the UWB systems are considered for BAN devices. The antenna matching ensures a good communication within the UWB devices, and if combined with a good penetrating ration through the human tissue, then the perfect device for BAN will be created. In this paper, a compact UWB monopole antenna with a reflector and a shorting wall is introduced and studied for BAN. According to the simulated results, the antenna design enhances the impedance matching (S11), the radiation pattern and optimizes the penetration ratio into the boy, taking into account the dielectric properties of human tissues. Simulations have been performed placing the antenna in the vicinity of a human body model at different distances. 20 mm has been found to be the optimum distance to obtain a good trade-off between antenna matching and near field penetration. The optimized UWB antenna exhibits a matching band of more than 10 GHz, with unidirectional radiation pattern and a good penetration ratio through the body.