Cost-effective design optimization of a wearable wideband microwave antenna

In this paper the problem of design optimization of a microwave wearable antenna is investigated. Reference is made to a specific antenna design that is wideband vee antenna which is characterized by 6 geometrical parameters. Those parameters were automatically adjusted with an evolution strategy based algorithm to obtain the impedance matching of antenna located in the proximity of the human body. Antenna was designed to operate in the ISM band that covers the frequency range of 2.4-2.5 GHz. The optimization procedure used finite difference time domain method based full wave simulator with a simplified human body model. In the optimization procedure small movements of antenna towards the human body that are likely to happen in real applications were considered. This is an important factor in wearable antenna design. The optimization procedure allowed obtaining the good impedance matching even if antenna is located close to the human body.