Abstract
A wideband dual-polarized MIMO antenna array having small size and stable radiation performance for base station applications is introduced. The antenna element, which is formed by four folded dipole antennas arranged in a small square aperture, is introduced to obtain excellent impedance matching and steady radiation pattern within a broad bandwidth of 36.7% (0.69-1 GHz) with low profile. Based on the high-performance element, a compact broadband dual-polarized MIMO array for mobile communications is then designed. To stabilize the radiation pattern of the MIMO array, a new method of element-shared scheme and 90° phase compensation are introduced to design the MIMO array to obtain stable half power beamwidth (HPBW) of around 64° for desired 120° sector coverage of cellular mobile communications. A special feed network with good performance is designed to excite the MIMO array. The MIMO array introduces a broad bandwidth of 43.7% (0.68-1.06 GHz) for reflection coefficient < -15 dB, as well as good isolation of more than 25 dB between all the ports. Steady radiation pattern with HPBW of 64±7° as well as low sidelobe level of below -15 dB are observed, which is desirable for modern mobile communications.
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