Complex gyrator circuit of a waveguide junction circulator using an Okada resonator

Conventional waveguide junction circulators usually consist of either a sin gle or a pair of coupled quarter-wave long gyromagnetic resonators in a tur nstile arrangement, or a planar post one in contact with the top and bottom walls of the junction of three H-plane waveguides. Another geometry that h as much to commend it is that obtained by suppressing the axial resonance i n the geometry, using either the single or the pair of coupled quarter-wave long resonators. The complex gyrator circuit of a junction circulator usin g such a weakly magnetised resonator is approximately developed in terms of effective constitutive parameters and is experimentally verified. The cons truction of a quarter-wave coupled device is separately described. Circulat ors using such resonators have been tested at 6000W-CW at S-band, 1500W-CW at X-band and 400W-CW at J-band.