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Summary: IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 1
Near-Field Antenna Measurements Using Nonideal
Measurement Locations
Ronald C. Wittmann, Bradley K. Alpert, and Michael H. Francis
Abstract| We introduce a near- eld to far- eld transfor-
mationalgorithmthat relaxes the usual restrictionthat data
points be located on a plane-rectangular grid. Computa-
tional complexity is ON logN, where N is the number of
data points. This algorithm allows e cient processing of
near- eld data with known probe position errors. Also, the
algorithm is applicable to other measurement approaches,
such as plane-polar scanning, where data are collected in-
tentionally on a nonrectangular grid.
I. Introduction
WE introduce a near- eld to far- eld transformation
method that relaxes the usual restriction that data
points be located on a plane-rectangular grid.1 It is not
always practical or desirable to make uniformly spaced
measurements; for example, the maintenance of position-
ing tolerances becomes more di cult as frequency is in-
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