Title :
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
fDate :
4/1/2002 12:00:00 AM
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;
Journal_Title :
Microwaves, Antennas and Propagation, IEE Proceedings
DOI :
10.1049/ip-map:20020229
