Correction of near-field antenna measurements made with an arbitrary but known measuring antenna

Plane-wave scattering-matrix theory of antennas and antenna-antenna interactions

“…(1.6-28) This equation shows that h(Jt)l'^(not /i, itself) is essentially equivalent to sJ(K). Both (28) and (27a) require that hlkyk = 0.…”

Planar Near-Field Measurement Techniques on High Performance Arrays. Part 1. Error Analysis for Nonscanning Beam Patterns

“…The far-field errors introduced by the computations (approximation 2) are so much smaller than the combined errors in the farfield caused by a finite scan area, positioning, instrumentation, and multiple reflections (approximations [1][2][3][4] that they are of little consequence. With the help of the sampling theorem.…”

“…In particular, if the probe were a perfect dipole, the output of the probe would be proportional to the electric field at the dipole in the direction of the dipole moment. The expression for S'loOO (defined with respect MO the reference plane z"0, and the transverse part of the propagation vector denoted by X) then becomes [3] s lo (i0…”

“…Table 3 In order to determine the far-field of the test antenna by "deconvoluting" the measured near-field data (without knowing the detailed scattering properties of the probe or test antenna), the multiple reflections must be neglected. That is, the second and higher order terms in the infinite series just described are assumed negligible when applying the planar near-field scanning techniques [3], Multiple reflections can be reduced by decreasing the size of the probe antenna, by increasing the distance between the probe and test antenna, and by appropriately covering the scanning range with efficient absorber material. These measures will not, however, 14 eliminate the multiple reflections entirely.…”

A Study of the Measurement of G/T Using Cassiopeia A

“…The extrapolation method is based upon the plane-wave scattering matrix analysis developed by Kerns [60][61][62], and is covered in detail in his publications [56][57][58][59].…”