volume | PIER Journals

2019-01-30

Design of Compact, Wideband Dual-Polarized Multi-Dipole Antenna for 2G/3G/LTE Base Station Applications

Zhaoyang Tang,

Dr. Zhaoyang Tang

Xidian University

China

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Yapeng Li,

Dr. Yapeng Li

Xidian University

China

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Zhipeng Zhao,

Dr. Zhipeng Zhao

Xidian University

China

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Ying-Zeng Yin

Professor Ying-Zeng Yin

Xidian University

China

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Progress In Electromagnetics Research C, Vol. 90, 41-49, 2019

doi:10.2528/PIERC18121902

Abstract

In this paper, awideband dual-polarized multi-dipole antennawith a compact radiator size is developedfor 2G/3G/LTE base station applications. The original antenna is composed of a pair of crossed square loop dipoles (SLDs) and two big Y-shaped feeding lines. Thanks to the adopted capacitive coupling, a wide impedance bandwidth is obtained with dual resonant modesin the low and middle frequency bands. Owing to the circular chamfersin thecrossed SLDs, the dual resonant modes are away from each other. Thus, a compact radiator size is implemented, and it is about 0.382λ₀×0.382λ₀ (λ₀ is the wavelength at center frequency of operation). To further widen the operating bandwidth of the antenna, a pair of crossed rectangular loop dipoles (RLDs) and four small Y-shaped feeding lines are introduced to generate a new resonant mode at high frequency. As a result, the impedance bandwidth of the proposed antenna is enhanced.Based on the optimized dimensions of the simulated antenna model, a prototype is developed, fabricated and tested. Measured results show that the proposed antenna has a relative impedance bandwidth of 53.9% from 1.68 to 2.92 GHz at two ports for VSWR<1.5. Within the operating impedance bandwidth, the measured port-to-port isolation is better than 30 dB. In addition, a stable gain of 8.2±0.5 dBi and a stable radiation pattern with 66°±4° half-power beamwidth (HPBW) in the horizontal plane are achieved across the whole bandwidth of operationfor dual polarizations. Finally, the proposed antenna is suitable for base station applications.

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Zhaoyang Tang, Yapeng Li, Zhipeng Zhao, and Ying-Zeng Yin, "Design of Compact, Wideband Dual-Polarized Multi-Dipole Antenna for 2G/3G/LTE Base Station Applications," Progress In Electromagnetics Research C, Vol. 90, 41-49, 2019.
doi:10.2528/PIERC18121902

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