Analysis and Design of Five Port Circular Disc Structures for Six-Port Analyzers

This paper presents a method for designing a five-port disc microstrip circuit suitable for the six-port network analyzers. The method is based on the planar circuit approach in which the two-dimensional Green´s function of a circular segment is used. It is found that a bandwidth of about 44% can be obtained (for |S/sub 11/| less than 0.2).