H - Electricity – 03 – H
Patent
H - Electricity
03
H
333/2
H03H 7/00 (2006.01)
Patent
CA 1057829
WAVEGUIDE CIRCULATOR HAVING SINGLE GYROMAGNETIC ELEMENT ABSTRACT A three-port waveguide circulator has three waveguide arms meeting at a common junction. A gyromagnetic element is centrally situated at the junction and is subjected to the influence of a magnetic field during operation of the circulator. An appreciable saving in gyromagnetic material is effected by making the gyromagnetic element approximately one quarter wavelength long along its axis in the ferrite medium at the center frequency of the band and mounting that element upon a pedestal that rises from a transformer plate. Both the transformer plate and the pedestal effect a narrowing in the height of the waveguide. One face of the gyromagnetic element is short circuited by the pedestal whereas the opposite face is open-circuited by a dielectric gap between it and the waveguide wall. To permit the thickness of the gap to be adjusted the pedestal or a portion of the waveguide wall directly opposite the gyromagnetic element can be made movable. To tune the in-phase mode without appreciably affecting the counter-rotating modes, a thin tuning post is provided that extends into the dielectric gap from the waveguide wall opposite the open- circuited face of the gyromagnetic element.
210732
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