基于超表面的天线多波束偏转技术研究北大核心CSCD

5G移动通信对天线提出了多极化、多频段、多波束等更高的技术需求。超表面具有很强的电磁调控能力,利用这一特性可以实现天线多波束偏转。本文首先提出新型的基于行波激励网络的双波束偏转方法,利用超表面实现定向波束可控,设计了单频低副瓣高增益的双波束超表面天线。其次,提出基于多相位自由度理论的双频行波激励网络,结合双频超表面,设计了双频双波束偏转角可独立控制的超表面天线。在此基础上,提出基于正相位响应理论的稳定波束偏转角的方法,设计了具有稳定波束的±45°双极化超表面天线。与传统多波束方法相比,本方法省略了复杂的波束形成网络,设计简单、结构紧凑,而且能够实现双频、双极化等特性,可为新一代移动通信天线的研制提供技术思路。

Researches on Multi-beam Antennas Based on Metasurface

5G mobile communication has proposed higher requirements for antennas such as multi-polarization, multifrequency band and multi-beam features. Based on metasurface structures with good ability of controlling electromagnetic wave, multi-beam antennas have been studied in this paper. A novel dual-steerable-beam method based on traveling-wave excitation is firstly proposed and a single frequency dual-beam metasurface antenna with low sidelobe and high gain is designed. A dual-band traveling-wave network based on multi-phase adjustment is proposed. Combined with dual-band metasurface structures, a dual-band dual-beam metasurface antenna is designed, in which the beam angles of two bands can be independently controlled. On this basis, a method of stabilizing beam based on positive phase response theory is proposed, and a ±45° dual-polarized metasurface antenna with stable beam is designed. Compared with the conventional multi-beam antennas, above antennas feature simple and compact structure due to avoiding complex beam-forming networks, and can realize dual-band and dual-polarization property. These methods provide technical solutions for new generation mobile communication antennas.