A CPW-fed wearable antenna at ISM band for biomedical and WBAN applications

In this paper, a Mercedes-Benz logo antenna with a metal plate located at an optimized distance from the proposed antenna is introduced as a wearable antenna to operate in the industrial, scientific, and medical band with center frequency of 2.45 GHz. The metal plate is integrated with the antenna as an isolator and a reflector to improve the radiation performance of the proposed design, reduce the back radiation and reduce the specific absorption rate, when loaded on the human body. The front-to-back ratio improves by 18.2 dB, by adding a metal plate to the structure. The proposed antenna with coplanar waveguide-fed with dimensions of 35 mm x 35 mm x 0.508 mm is printed on a Rogers 4003C substrate, and has an impedance bandwidth from 2.20 to 2.56 GHz, the gain of 7.3 dBi at 2.45 GHz, and SAR levels is less than the criteria set by the FCC and ICNIRP. Nowadays, attention to health as product quality assurance factor along with other technical specifications is the requirements of industrial productions, especially in competition with superior brands. Based on comparisons made with similar works, the proposed wearable antenna structure can be used for wireless body area network.