Dual Feed Pattern Reconfigurable Antenna for Wireless Applications

In this paper, a novel dual band dual feed multiple input multiple output reconfigurable antenna is designed. On-plane printing methodology is focused in designing the antenna. To implement the design, a circular Defected Ground Structure (DGS) with concentric split ring is employed beneath the signal plane and the reconfiguration is attained without using any switching elements. The signal plane comprises of octagonal ring pattern with orthogonal dual feed arrangement. The antenna prototype has the dimension of 0.66λ × 0.66λ, where the octagonal ring is of 0.34λ. An impedance of 50 Ω is maintained in designing the prototype. The dual band has been achieved by the periodic property of split ring employed within the circular DGS in the ground plane. Alternate shorting of ports has been performed to attain the reconfiguration. The prototype is designed to be utilized in public safety and aeronautical radio navigation under US standards at 0.816 and 1.072 GHz with reflection coefficients of − 17 and − 21 dB respectively. The patterns have been reconfigured by terminating one of the ports with 50 Ω impedance termination. This resulted in change of beam directions, attaining pattern reconfiguration.