Low Scattering Element-Based Aperture-Shared Array for Multiband Base Stations

• Published in: IEEE transactions on antennas and propagation Vol. 69; no. 12; pp. 8315 - 8324
• Main Authors: Yang, Sheng Jie, Yang, Yang, Zhang, Xiu Yin
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.12.2021; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antenna arrays; Antenna radiation patterns; Antennas; Aperture-shared array; Apertures; base station antenna; cross-band scattering; Dipole antennas; Dual polarization (waves); dual-band array; Loaded antennas; pattern distortion; Radiation; Radiators; Scattering; Transmitting antennas
• ISSN: 0018-926X; 1558-2221
• DOI: 10.1109/TAP.2021.3083760

This article presents a dual-wideband dual-polarized aperture-shared antenna array with low blockage effect between cross-band elements, including a low-band (LB) element with a <inline-formula> <tex-math notation="LaTeX">4 \times 4 </tex-math></inline-formula> high-band (HB) antenna array underneath. The radiator of the proposed LB element consists of four slim loops with loaded periodic split-ring resonators (SRRs) for achieving low scattering property in the high band. As a result, the blockage effect of the LB element on the HB antenna array is nearly indistinct. The radiation performance, as well as the S-parameters of the HB elements in the dual-band array, is almost the same as the isolated case. For demonstration, the dual-band aperture-shared antenna array, operating in the LB of 0.69-0.96 GHz (32.7%) and the HB of 3.3-4.2 GHz (24%), is fabricated and measured. Besides, the isolated LB antenna and HB array are designed for comparison. Compared with the isolated case, the measured peak gain variation of a <inline-formula> <tex-math notation="LaTeX">1 \times 4 </tex-math></inline-formula> HB array in one column is lower than 0.7 dB after adding the proposed LB element. In addition, the radiation pattern variation within 3 dB beam coverage is less than 1.5 dB. Therefore, the proposed dual-band aperture-shared array is very suitable for tackling the integration of 5G and 4G/3G/2G base station antennas.