A dual-band printed antenna with metal back-cover for WBAN applications

A dual-band printed antenna with metal back-cover for WBAN applications is proposed. A FR4 substrate with T-shaped coupled feed structure is placed under the metal back-cover. At first, a slot antenna operating at 2.45 GHz is designed on the metal back-cover. In order to enhance the bandwidth in 2.45 GHz ISM band, two parasitic elements connected to the ground is added nearby the feed structure. They enable the metal back-cover to operate as a patch antenna by exciting TM
₁₁
mode. Another parasitic element is used to cover 5.8 GHz ISM band. The radiation patterns of the proposed antenna on the phantom are directed toward outside to communicate with external devices.