This paper describes an alternative configuration of a four-port circulator realized in a
microstrip ferrite coupled line technology. The proposed fully planar device employs two
three-port circulators consisting of a ferrite coupled line junction and T junction. Both
circulators are connected through the same arm, hence, the problem of anti-parallel
magnetization met in this type of circulators is avoided without the increase of the device
width. The simulated and experimental results check feasibility of such device. The …