FABRICATION OF VERY WEAKLY AND WEAKLY MAGNETIZED MICROSTRIP CIRCULATORS

The synthesis of practical microstrip circulators in terms of a microw ave specification remains in practice a difficult problem. If a very w eakly magnetized model is adopted for its gyrator circuit, this task s hould in principle be (once the quality factor of the resonator is sti pulated) a simple endeavor provided the substrate thickness can be var ied. If it is not possible to do so, it is necessary to either alter t he resonator shape or the minimum ripple level of the microwave specif ication or vary both quantities. This paper demonstrates that the very weakly magnetized model of a junction circulator using either a side or an end-coupled triangular resonator is more restricted than may be at first supposed. A weakly magnetized solution for the design of such junction circulators which bridges the interval between the very weak ly and the moderately magnetized regimes is the main contribution of t his paper.