INTEGRATED DC RF DESIGN THEORY FOR FERRITE CIRCULATORS/

An integrated design approach is described, in which the dc and rf asp ects of circulator design are both addressed for a realistic physical model of the microwave ferrite. The microwave ferrite disc is concepti onally subdivided into a center puck and a sequence of rings, each of which may have a different magnetization. The dipole interaction betwe en the rings is taken into account by means of a dipolar interaction m atrix, which is a generalization of the conventional demagnetizing fac tor. The rf behavior of the ferrite (including off-resonance loss and ''low-field loss'') is characterized by appropriate theoretical expres sions derived on the same physical basis as the equations that charact erize the de behavior. (C) 1997 American Institute of Physics.