Cross-Band Interaction Mitigation in Dual-Band Antenna Arrays for 4G/5G and Beyond

摘要

Collocating antennas for different purposes on a single communication platform is a big trend as it can improve space efficiency. However, strong interferences happen among the antennas working at different bands due to the close proximity, leading to deteriorated antenna performance. This paper proposes a simple yet effective method to alleviate this issue by developing low-scattering array topology without increasing array size. The proposed method is used on a typical 3G/4G dual-band dual-polarized base station antenna array as an example to illustrate its effectiveness. By relocating the positions of the antennas in such array, the antenna performance can be substantially enhanced. Although this technique cannot eliminate the interferences solely, it can be used as a supplementary with other techniques to achieve optimal performance. At last, the proposed array topology is used together with a low-scattering spiral antenna designed for cross-band scattering mitigation, which leads to an outstanding array performance with a compact size.