The Challenge of Active Circulators

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

4 Scopus Citations
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Original languageEnglish
Article number8726438
Pages (from-to)55-66
Journal / PublicationIEEE Microwave Magazine
Volume20
Issue number7
Online published4 Jun 2019
Publication statusPublished - Jul 2019

Abstract

Ferrites are the traditional materials used in conventional passive circulators [1]-[3]. One of the first ferrite microwave circulators was the Faraday rotation circulator, which is based on Faraday rotation, the phenomenon that occurs when microwaves of a specific polarization are incident upon a ferrite material subjected to a magnetic field parallel to the direction of propagation. These circulators were later replaced by resonance isolators and differential phase shift circulators, which have higher power-handling characteristics and are simpler to construct. In 1964, the lumped-element circulator [4] was brought to the attention of the microwave industry. The lumped-element Y circulator uses ferrite and has a mesh mechanism in place of the ordinary strip-line circulators center conductor. Ferrites are too expensive and bulky for practical use in integrated circuits.

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Full text of this publication does not contain sufficient affiliation information. With consent from the author(s) concerned, the Research Unit(s) information for this record is based on the existing academic department affiliation of the author(s).

Citation Format(s)

The Challenge of Active Circulators. / Mung, Steve W.Y.; Chan, Wing Shing.

In: IEEE Microwave Magazine, Vol. 20, No. 7, 8726438, 07.2019, p. 55-66.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal