Spherical Antenna Arrays for Future Communications: Principles, Applications, and Research Directions

TL;DR

This paper discusses spherical antenna arrays (SAAs) as a promising solution for 6G communications, highlighting their advantages, applications, and research challenges compared to traditional array types.

Contribution

It analyzes the limitations of traditional arrays, summarizes SAA structures, and verifies their superiority through a case study, outlining future research directions.

Findings

SAAs offer better 3D coverage and angular resolution than ULAs and UPAs.

Case study confirms the advantages of SAAs in practical scenarios.

Key technical challenges for SAAs are identified for future research.

Abstract

With the development of 6G technologies, traditional uniform linear arrays (ULAs) and uniform planar arrays (UPAs) can hardly meet the demands of three-dimensional (3D) full-space coverage and high angular resolution. Spherical antenna arrays (SAAs), with elements uniformly distributed on a spherical surface, provide an effective solution. This article analyzes the issues of traditional arrays, summarizes the advantages and typical structures of SAAs, discusses their potential application scenarios, and verifies their superiority over UPAs via a case study. Finally, key technical challenges and corresponding research directions of SAAs are identified, providing a reference for their research and application in future wireless communications.