Thin Internal GSM/DCS Patch Antenna for Mobile Phones

A thin internal patch antenna with an air-layer substrate thickness of 4 mm only for GSM/DCS operation has been proposed. The enhanced bandwidths of the antenna are obtained by adding a widened end portion to the longer resonant path and a tapered end portion to the shorter resonant path, which are expected to result in more smooth surface current distributions in the end portion of the antenna's two resonant paths, thereby leading to bandwidth enhancement. With its thin profile, the antenna is very promising for thin mobile phone applications