Planar Near-Field Antenna Measurements Using Nonideal Measurement Locations¤

— The standard planar near-…eld to far-…eld transformation method requires data points on a planerectangular lattice. In this paper we introduce a transformation algorithm in which measurements are neither required to lie on a regular grid nor are strictly con…ned to a plane. Computational complexity is O (N logN), where N is number of data points. (Actual calculation times depend on the numerical precision speci…ed and on the condition number of the problem.) This algorithm allows e¢cient processing of near-…eld data with known probe position errors. Also, the algorithm is applicable for other measurement approaches, such as plane-polar scanning, where data are collected on a nonrectangular grid. Keywords: near-…eld antenna measurements; planar scanning; plane-polar scanning; probe position errors