Far-field Modeling for Non-planar Array Based on Spherical Wave Expansion

A simple method for modeling the circular array and calculating its radiation pattern from a unit antenna's spherical near-field data is presented. This method utilizes near-field data to calculate the transformation coefficient of spherical wave expansion (SWE) and thus performs a near-field to far-field transformation to obtain the radiation field. Then, the circular-ring antenna array's radiation field is obtained by using a modified array factor. Comparison between full-wave simulations and presented method demonstrates the accuracy and efficiency of our method.