Optimum design of Yagi array of loops

The purpose of this study is to determine the optimum structure of a Yagi array of circular loops subject to constraints on directivity, bandwidth, or the size of the array. It is shown that an array configuration is completely determined when any two of these constraints are specified. It is also shown that the optimized Yagi array of loops may have either a directional beam in the endfire direction or a conical-shell beam.