Front-to-back ratio improvement of a compact base-station antenna for 5G NR applications

作者：Li, Ronglin; Huang, Yuanyun; Du, Jiaying; Cui, Yuehui^*

来源：MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, 2024, 66(2): e34063.

DOI：10.1002/mop.34063

• 5G NR base station
• compact antenna
• dual-polarized antenna
• front-to-back ratio

The front-to-back ratio (FBR) of a compact dual-polarized antenna is improved for 5G new radio (NR) base-station applications. A rim made of partially reflective surfaces is introduced to improve the FBR. A meta-surface and a parasitic element are employed to lower the antenna height. The dual-polarized base-station antenna with improved FBR features a compact size of 0.64 lambda(L) x 0.64 lambda(L) x 0.11 lambda(L), where lambda(L) is the wavelength in free space at the lowest operating frequency. The FBR achieved over the 5G NR n28/n82/n83 bands (0.69-0.96 GHz) for return loss >15 dB is higher than 26 dB. The antenna gain is higher than 7 dBi and the isolation is higher than 30 dB.