Tri-band MIMO antenna for WLAN, WIMAX and defence system & radio astronomy applications

Abstract

In this paper, an efficacious and impermeable undeviating MIMO consisting of 70 × 50 × 0.4 mm3 is used for WLAN, defence system & radio astronomy and WiMAX applications. In place of the technique of parasitic elements to abandon the reactive coupling connection between the antennas we have used an alternate technique where a neutralizing line is connected between the two symmetrical radiating elements. In this technique four small slits of small size are etched on to the ground plane to reduce isolation (mutual coupling) between the antennas. This has resulted in the proposed antenna producing a good bandwidth at the three resonant frequencies of (3.2–3.7 GHz) for Wireless LAN, (5.1–5.6 GHz) WiMAX and (6.7– 7.5 GHz) defence system & radio astronomy applications with |S11|< -10 dB and mutual coupling |S12|< -20 dB for the entire operating band. The simulation results and measured results demonstrate that tri-band MIMO antenna is more acceptable for the design in portable device applications.