Equivalent representation of multiwire transmission-line transformers and its applications to the design of hybrid networks

Aflshct-Lumped-element type equivalent representations of general multiwire transmission-line transformer3 containing ferrite torroids are presented. They are based on the physical model with cousideration of the mutual inductive couplings between all conductor segments of the winding wires. The concept of the mode of propagation is not used for the derivation of this representation. Signlficaut features of their Zn-port equivalent circuits are that they give transfer c%arwWWcs almost for all frequencies under any terminal conditions. So they are useful to the analysis aud the design of many kinds of the transformer circuits. As the applications, the design for hybrid networks cousistbqg of a trifilar wimling tramformer and Balun areexplained. Experimental results area heomparedwfth theory.