volume | PIER Journals

Abstract

A dual-band dual-polarized dipole antenna with an artificial magnetic conductor (AMC) reflector is proposed, which can be applied in 5G base stations. The antenna consists of a pair of ±45° crossed dipoles and a wideband AMC reflector. By adopting arrow-shaped dipoles and introducing slots, dual-band characteristic is achieved. The AMC is designed to operate with 90° reflection-phase bandwidth of 2.1-3.9 GHz (30%). Compared with using traditional reflector, the profile height can be reduced from 0.25λ₀ to 0.11λ₀ (where λ₀ is the free-space wavelength at 2.6 GHz). The measurement results show that the impedance bandwidth with |S₁₁| < -14 dB is about 15.5% (2.44-2.85 GHz) and 18.6% (3.17-3.82 GHz), covering the Sub-6 GHz bands. The average gain is 8.5 dBi in the lower band and 8.2 dBi in the upper band. At 2.6 GHz and 3.45 GHz, the half-power beamwidth of the antenna is 77° and 80°, respectively. In the two bands, the port isolation of the antenna is more than 28 dB, and the cross-polarization level is less than -20 dB.

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Professor Shiqiang Fu

Dr. Xuehao Zhao

Dr. Chanjuan Li

Dr. Zhongbao Wang