Four-port circulator using reduced ground plane ferrite coupled line junction

In this paper the investigations of four-port circulator using longitudinally magnetized ferrite coupled line section are presented. The device is designed by cascading ferrite section with magic-T junction ensuring its even and odd mode excitation. The scattering parameters of ferrite coupled line junction are calculated using own software and verified with the use of commercial software. The even and odd excitation of ferrite section is realized from multilayer magic-T junction designed using commercial software. The simulation results were obtained by cascading S-matrices of the ferrite and magic-T junctions. The results were verified by the measurement of the manufactured prototype. The measured results clearly show nonreciprocal behavior of the designed four-port circulator.