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An FE adjustment of a waveguide turnstile junction circulator using a three quarter wavelength gyromagnetic resonator.

Helszajn, Joseph; Sharp, John


Joseph Helszajn

John Sharp


One difficulty with the design of millimetre waveguide junction circulators using quarter-wave long gyromagnetic resonators, beside that of fabrication, is the inability to realize the required gyrotropy using existing ferrite materials. This shortcoming fundamentally restricts not only the gain bandwidth product of a degree-2 circulator but also produces complex gyrator circuits which are incompatible with those using single quarter wave long resonators. There is no way to alleviate the former difficulty but one way to partly deal with the latter is to have recourse to a three-quarter wave long gyromagnetic resonator in a re-entrant cavity. The purpose of this paper is to adjust the first circulation condition of one device in WR15 waveguide using a 3 dimensional commercial F.E. solver and adjust the second one experimentally.

Working Paper Type Working Paper
Publication Date 2012-04
Deposit Date May 24, 2012
Publicly Available Date May 24, 2012
Publisher Institution of Engineering and Technology (IET)
Keywords Waveguide Turnstile Junction Circulator; quarter-wave long gyromagnetic resonators; gyrotropy;
Public URL
Contract Date May 24, 2012