Multiple-Port Power Dividers/Combiners Circuits Using Circular Microstrip Disc Configuration

A generalized method for evaluating the S-parameters of a multiport center-fed circular microstrip disc power divider/combiner circuit is presented. The method is based on the planar circuit approach in which the two-dimensional Green´s function of a circular segment is used. Various symmetrical power divider/combiner circuits are designed and tested. The effect of introducing shorted posts between the circumferential ports on the reduction of radiation losses is discussed. Experimental results verifying the design methodology and the optimization procedure are given.