Dual and wideband 6-port MIMO antenna for WiFi, LTE and carrier aggregation systems applications

Abstract

This article describes a novel dual-band 6-port MIMO antenna for WiFi, LTE, and carrier aggregation system applications. The proposed antenna consists of a defected annular ring, slots, an array structure, a neutralization block, and a novel isolation structure (GP-3) for enhancement of bandwidth, coupling, isolation, gain, and efficiency. After systematic investigation of the reference antenna (A-0; 0.65λ0×0.48λ0mm2) at the design frequency of 2.4 GHz, an optimized antenna (A-4) with ground plane GP-3 is selected among the antennas (A-1 to A-4). The proposed antenna resonates in dual-band, with a lower band (1.6–2.45 GHz (simulated), 1.57–2.39 GHz (measured)) due to ports P5 and P6, and a higher band (2.3–2.6 GHz (simulated), 2.3–2.58 GHz (measured)) due to ports P1, P2, P3 and P4. A peak realized gain of 2.2 dB and 3.34 dB at resonance frequencies of 1.7 GHz and 2.45 GHz is obtained, respectively. The proposed antenna exhibits a maximum isolation and total efficiency of 45.6 dB and 88%, respectively. Simulated results by means of HFSS version 18 are validated with experimental results of the proposed work.