SYNTHESIS OF OCTAVE-BAND QUARTER-WAVE COUPLED SEMI-TRACKING STRIPLINEJUNCTION CIRCULATORS

The complex gyrator circuit of stripline circulators using tracking ju nctions which satisfy the physical and magnetic variables of the Wu an d Rosenbaum boundary conditions, is a nearly frequency independent oct ave-band resistive network, Such a junction may exhibit two minimas in its reflection coefficient when matched by a two section impedance tr ansformer, However, a third minima may be realised by utilizing a comp lex rather than a real gyrator circuit. This paper summarises this cla ss of semi-tracking solution in a simple way as a preamble to the desi gn of a degree-3 quarter wave coupled circulator, The overall frequenc y behaviour of this class of junction has been separately evaluated by combining the electromagnetic and network problems (in conjunction wi th a two step impedance matching network).