Complete Analysis of Spherical Higher Order Mode Excitation in Antenna Measurement Probe
Classical probe corrected Spherical Near Field (SNF) measurement assumes a |μ| = 1 probe. This requirement is needed to fully compensate the effect of the probe during the NF/FF transformation. If the probe has an higher order mode content, a residual error will affect the measured pattern (probe modal truncation). This requirement leads to challenging probe designs especially if the required bandwidth is wide and/or there is a limitation on the acceptable dimension. As a consequence, in many practical cases, higher order spherical modes could be radiated.
In this paper, the source of higher order spherical modes of the MVI SP1100 probe is investigated using MV-INSIGHT software which reconstructs equivalent currents starting from the measured NF. The equivalent currents associated to higher order modes have been computed on a conformal geometry encompassing the probe. In this way, the origin of such higher order modes has been deduced.
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