A survey of active quasi-circulators

• 作者: Bingjun Tang Li Geng
• 来源期刊: 半导体学报（英文版）
• 年，卷（期）: 2020,（11）
• 所属期刊栏目: REVIEWS
• 页码范围: 65-74
• 页数: 10页
• 语种: 英文
• DOI: 10.1088/1674-4926/41/11/111406

摘要

With the development of multi-band wireless communication and the increasing data transmission rate,the circulator as an antenna interface must be able to work in multiple frequency bands and provides large bandwidth.It presents a high challenge to the design of circulators,especially the active quasi-circulators.In this survey,we review the representative active quasi-circulators and summarize three different techniques and the corresponding structures to show an incremental improvement of the isolation and bandwidth of the active quasi-circulators.In addition,we also compare the performance of several state-of-art active circulators,and analyze their advantages and disadvantages.Finally,we conclude the future trend of the active quasi-circulators.