volume | PIER Journals

Abstract

This paper presents a compact 39 × 39 mm² quad-port ultra-wideband (UWB) MIMO antenna with dual band-notches and enhanced inter-element isolation. Four orthogonally arranged microstrip-fed circular radiators are employed to reduce mutual coupling, while two U-shaped slots etched on each radiator suppress interference from the C-band (3.1-4.3 GHz) and Wireless LAN (5.2-5.6 GHz) bands. We investigate the antenna using Characteristic Mode Analysis through modal significance and modal current distributions. The proposed diversity antenna is evaluated using envelope correlation coefficient, diversity gain, total active reflection coefficient, channel capacity loss, multiplexing efficiency, and simulated group delay. The antenna achieves an impedance spectrum covering 2.9-10.6 GHz, radiation efficiency of 90%, gain of 5.2 dBi, ECC < 0.02, and isolation of -20 dB. The results demonstrate that the proposed antenna provides an effective combination of small size and high isolation, making it viable for UWB applications.

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Dr. Sunitha Mandava

Dr. Thotakura Sushma

Dr. Rajesh Gogineni

Dr. Chunduri Kiran Kumar

Dr. Ramesh Babu Sadineni

Dr. Veeravalli Ramakoteswara Rao