A survey of active quasi-circulators. (November 2020)

• Record Type: Journal Article
• Authors: Tang, Bingjun; Geng, Li
• Is Part Of: Journal of semiconductors. Volume 41:Number 11(2020)
• Publication Date: 2020-11
• Subjects: active quasi-circulator -- multiband -- bandwidth -- isolation -- linearity -- insertion loss; Semiconductors -- Periodicals; 621.38152
• DOI: 10.1088/1674-4926/41/11/111406
• Languages: English
• ISSNs: 1674-4926

Abstract

Abstract: 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.