Fringing effects in re-entrant and Inverted re-entrant turnstile waveguide junctions using cylindrical resonators.

Helszajn, Joseph and Sharp, John (2011) Fringing effects in re-entrant and Inverted re-entrant turnstile waveguide junctions using cylindrical resonators. IET Microwave Antennas and Propagation, 5 (9). pp. 1109-1115. ISSN 1751-8725

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One waveguide network is a 5-port turnstile junction consisting of three H-plane waveguides with a circular quarter wave long resonator on its axis, open circuited at one end and short circuited at the other. It is readily converted to a turnstile 3-port circulator by replacing the dielectric resonator by a gyromagnetic one and closing 2 of the 5 ports. Another network that may be reduced to a 3-port circulator is a 7 port turnstile junction containing a pair of similar coupled resonators or a half wave long arrangement open circuited at each end. The introduction of suitable symmetry planes in the latter two geometries suggests that all three have, in the absence of any fringing effects, the same centre frequency. In practice, however, this is not so. This paper employs an FE process to investigate this assumption in the cases of re-entrant and inverted re-entrant resonators. One conclusion of this work is that a FE or similar numerical tool is mandatory for the adjustment of such a degree-2 circuit.

Item Type: Article
Print ISSN: 1751-8725
Electronic ISSN: 1751-8733
Additional Information: This paper is a postprint of a paper submitted to and accepted for publication in IET Microwave Antennas and Propagation and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library
Uncontrolled Keywords: waveguide network; five-port turnstile junction; H-plane waveguides; turnstile threeport circulator; re-entrant and inverted re-entrant resonators;
University Divisions/Research Centres: Faculty of Engineering, Computing and Creative Industries > School of Engineering and the Built Environment
Dewey Decimal Subjects: 600 Technology > 620 Engineering > 621 Electronic & mechanical engineering > 621.3 Electrical & electronic engineering
Library of Congress Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Item ID: 5324
Depositing User: Prof. John Sharp
Date Deposited: 24 May 2012 14:17
Last Modified: 13 Jan 2014 09:59

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