Helszajn, Joseph, Sharp, John and Mackay, Mark (2008) Split frequencies and susceptances of the three port junction circulator from an experimental determination of the complex gyrator circuit. IEEE Transactions on Microwave Theory and Techniques, 56 (10). pp. 2213-2220. ISSN 0018-9480

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Abstract/Description

The adjustment of the classic three port circulator involves an in-phase eigen-network and a pair of split counter-rotating ones. The purpose of this paper is to use some recent relationships to experimentally extract the split susceptances of the counter-rotating immittances and the susceptance slope parameter of the junction by having recourse to a 1-port measurement of its complex gyrator circuit. This is done under the assumption that the in-phase eigen-network of the junction may be idealized by an electric wall. The split frequencies of the counter-rotating eigen-networks of the circulator may also be deduced from this characterization and are in good agreement, under the same assumption, with those derived from 1-port measurements on a terminated circulator. The latter arrangement does not, however, allow the split susceptances of the counter-rotating eigen-networks to be deduced.

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