The Challenge of Active Circulators
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal
Related Research Unit(s)
|Journal / Publication||IEEE Microwave Magazine|
|Online published||4 Jun 2019|
|Publication status||Published - Jul 2019|
|Link to Scopus||https://www.scopus.com/record/display.uri?eid=2-s2.0-85067072143&origin=recordpage|
Ferrites are the traditional materials used in conventional passive circulators -. 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  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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