SYNTHESIS OF QUARTER-WAVE COUPLED JUNCTION CIRCULATORS USING MODERATELY MAGNETIZED DISC RESONATORS WITH COMMENSURATE EIGEN-NETWORKS

A classic solution met in the theory of a junction circulator using a disc gyromagnetic resonator is the so-called tracking one for which th e complex gyrator circuit displays a nearly frequency-independent gyra tor conductance and a nearly constant susceptance-slope parameter over nearly an octave band. It is characterised by a tensor permeability w ith an off diagonal element kappa, 0.50 less than or equal to kappa le ss than or equal to 1.0, a unique coupling angle, an in-phase eigennet work with an ideal electric wall at the terminals of the junction, and counterrotating ones with split conjugate reactances at the same term inals, Another useful solution is the so-called weakly magnetised one for which the gyrotropy is bracketed by 0 less than or equal to kappa less than or equal to 0.30 but for which the solution is independent o f the coupling angle. The paper investigates the complex gyrator circu it of this sort of circulator in the intermediate gyromagnetic interva l defined by 0.30 less than or equal to kappa less than or equal to 0. 50. Each gyromagnetic interval is associated with a unique complex gyr ator circuit with a distinct value of gain-bandwidth product or qualit y factor. A practical example of such a synthesis is included.