Aperture-Shared Dual-Band Antennas With Partially Reflecting Surfaces for Base-Station Applications

作者：Qin, Yue; Li, Ronglin; Xue, Quan; Zhang, Xiuyin; Cui, Yuehui^*

来源：IEEE Transactions on Antennas and Propagation, 2022, 70(5): 3195-3207.

DOI：10.1109/TAP.2021.3137448

• Base station
• broadband antenna
• dual-band antenna
• partially reflecting surface (PRS)

(A) new approach is proposed to develop aperture-shared dual-hand antennas using partially reflecting surfaces (PRSs). A fully aperture-shared dual-hand antenna consisting of a low-band antenna (LBA) and a high-band antenna (HBA) right below the LBA is first investigated. The aperture sharing has little influence on the LBA but causes a severe shielding effect on the HBA. To alleviate the shielding effect, a low-pass PRS is inserted between the LBA and HBA, forming an air-filled quasi-Fabry-Perot cavity, which can make compensation for the radiation from the HBA but with little influence on the LBA. The second PRS is introduced above the LBA to enhance the bandwidth (BW) for HBA. It is shown that the fully aperture-shared dual-band antenna achieves an impedance BW (vertical bar S11 vertical bar < -15 dB) of similar to 43.7% (0.68-1.07 GHz) for the LBA and similar to 45% (1.7-2.7 GHz) for the HBA with an average gain of similar to 8 dBi and stable radiation patterns. Based on the PRSs, an aperture-shared dual-band antenna subarray is finally developed for base-station applications, which covers the frequency bands of 0.68-0.96 and 1.7-2.7 GHz for 2G/3G/4G mobile communications.