Split frequencies and susceptances of the three port junction circulator from an experimental determination of the complex gyrator circuit

Helszajn, Joseph; Sharp, John; Mackay, Mark

Abstract

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.

Citation

Helszajn, J., Sharp, J., & Mackay, M. (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, 2213-2220. https://doi.org/10.1109/TMTT.2008.2003136

• Journal Article Type: Article
• Publication Date: 2008-10
• Deposit Date: May 24, 2012
• Publicly Available Date: May 24, 2012
• Print ISSN: 0018-9480
• Electronic ISSN: 1557-9670
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 56
• Pages: 2213-2220
• DOI: https://doi.org/10.1109/TMTT.2008.2003136
• Keywords: Circulators; non-reciprocal devices; eigenvalues; characterization; complex gyrator
• Public URL: http://researchrepository.napier.ac.uk/id/eprint/5327
• Publisher URL: http://dx.doi.org/10.1109/TMTT.2008.2003136