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Abstract

In this paper, an elliptical monopole antenna is operated in fundamental mode by reducing the electromagnetic coupling (EMC) between higher-order modes. The electromagnetic coupling is decreased by decreasing the width of the radiating element and ground-plane dimensions, and increasing the gap between the radiating element and ground plane. The ellipse is sliced from the top, as there is little surface current on the top portion of a monopole. The symmetrical portion of this sliced elliptical monopole is selectively etched with little effect on impedance variation. Dual-band characteristics are obtained over 2.3-2.7 GHz (Wi-Fi and Bluetooth bands) and 5.4-5.9 GHz (WLAN band), as well as over 2.3-2.7 GHz (Wi-Fi and Bluetooth bands) and 5.13-5.71 GHz (WLAN band), depending on the etching amount. A rectangular strip is added to the etched monopole to operate over 2.3-2.7 GHz (Wi-Fi, Bluetooth bands) and 3.3-3.9 GHz (5G band). To enhance the gain of a compact dual-band antenna, a reflecting metamaterial surface consisting of an array of square patches is designed and placed below the structure. A high-gain dual-band MIMO antenna is designed by placing four elements orthogonally above the centre of four edges of the metamaterial surface. S₁₁ < -10 dB, isolation > 18 dB and 22 dB, and antenna gain of 7.5 dBi and 7.4 dBi are obtained over 2.35-2.7 GHz and 3.3-3.6 GHz, respectively. The structure is fabricated. The measurement results validate the simulation ones.

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Mr. Nilesh Lakade

Prof. Shankar D. Nawale

Professor Anjali Rochkari

Dr. Mahadu Trimukhe

Prof. Rajiv Kumar Gupta