Dual frequency band and polarization reconfigurable antenna for mobile devices

This paper presents the design of a compact planar inverted-F antenna (PIFA) with reconfigurable dual resonance frequency of 800 MHz and 1.4 GHz, and switchable horizontal and vertical polarization for mobile devices. PIN diodes are used to electronically control the antenna's electrical path width so as to achieve the desired resonance frequencies. The narrower the electrical path, the higher the resonance frequency. The antenna comprises a coupled parasitic shorted strip and feeding strip. By controlling the ON/OFF states of two PIN diodes, four operation modes from two frequencies and two polarizations can be achieved. The proposed antenna has a gain of 3.7 dBi, efficiency of up to 92%, and a reflection coefficient of less than −10 dB over the resonant bands for both horizontal and vertical polarizations.