WR75 junction circulator using 90° and 180° ridge UEs

Author

Helszajn, J. ; Tsounis, B. ; Caplin, M.

Author_Institution

Apollo Microwaves Ltd, Pointe Claire, Que., Canada

Volume

149

Issue

2

fYear

2002

fDate

4/1/2002 12:00:00 AM

Firstpage

129

Lastpage

137

Abstract

The gain-bandwidth product of a practical junction circulator is fixed by the quality factor of its junction and the topology of its matching circuit. One difficulty with the design of a large mean power circulator or a millimetre one is that its quality factor may not be compatible with the use of 30° and 90° unit elements (UEs). A method of overcoming these difficulties is to employ a 180° UE at each so-called characteristic plane of the junction. The purpose of the paper is to describe one arrangement in a WR75 waveguide. The device has a return loss of 20 dB and an insertion loss of 0.17 dB over a 16% frequency band. The quality factor of its complex gyrator circuit is 4.0

Keywords

Q-factor; impedance matching; microwave circulators; millimetre wave circulators; network topology; waveguide couplers; waveguide theory; 0.17 dB; 20 dB; WR75 junction circulator; WR75 waveguide; characteristic plane; complex gyrator circuit; degree-2 network topologies; gain-bandwidth product; gyromagnetic planar resonator; high power waveguide circulator; insertion loss; large mean power circulator; magnetic circuit; matching circuit; millimetre power circulator; nonoptimum quarter-wave transformer; quality factor; return loss; topology; unit elements;

fLanguage

English

Journal_Title

Microwaves, Antennas and Propagation, IEE Proceedings

Publisher

iet

ISSN

1350-2417

Type

jour

DOI

10.1049/ip-map:20020229

Filename

1019780