A Compact, Dual-Polarized Multiband Array for 2G/3G/4G Base Stations

• Published in: IEEE transactions on antennas and propagation Vol. 67; no. 4; pp. 2298 - 2304
• Main Authors: Wu, Rui, Chu, Qing-Xin
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.04.2019; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: 2G/3G/4G; Antenna arrays; Antenna measurements; Apertures; Arrays; Baffles; Bandwidth; base station antenna; Base stations; Broadband; Chamfering; Dipoles; Dual polarization (waves); dual-polarized antenna; Frequencies; Gain; Impedance; LTE700/GSM850/GSM900; Miniaturization; multiarray; Reflectors; Spectrum allocation
• ISSN: 0018-926X; 1558-2221
• DOI: 10.1109/TAP.2019.2902652

A compact, dual-polarized multiband array is proposed and developed for 2G/3G/4G base station applications. The antenna is formed by two-element lower band array, five-element higher band array, bowl-shaped reflectors, bended baffles, and rectangular baffles, which are coexisting over one reflector. Miniaturized higher band element covering 2G/3G/4G bands and new square-shaped aperture lower band element covering LTE700/GSM850/GSM900 have been proposed. The higher band elements are placed upon the bowl-shaped reflector and composed of two pairs of loop dipoles with chamfers and vertical stubs for miniaturization. The bowl-shaped reflector is of great significance to the stable beamwidth, while the rectangular and bended baffles are designed further to improve the beamwidth. Moreover, the five-element higher band array is designed with electric downtilt from 0° to 10°. The measured results determined by VSWR <;1.7 are with the whole broadband coverage from 0.698 to 0.96 and 1.7 to 2.7 GHz, which can cover the whole 2G/3G/4G bands. Furthermore, the stable half-power beamwidth of 65.9 ± 4.3° at the horizontal plane (H-plane) as well as stable gain and enhanced cross-polarization discrimination (XPD) are achieved within both higher and lower frequency bands.