Broadband Far-Field Estimation of a Spherical Dipole Using Near-Field Scanning Data Up to 1 GHz

In this publication, the results of a broadband far-field transformation of close-range near-field scanning data are presented. The device-under-test (DUT) for verification is a spherical dipole antenna with an embedded comb generator to create broadband electromagnetic emissions. First, the DUT is simulated to obtain reference data for the basic near- and far-field behavior. Then, the near-field Huygens-Box data of the DUT are captured and imported into a simulation tool. Using the Huygens-Box data the far-field pattern of the DUT is calculated and examined. The dipole-shaped radiation pattern is verified and the distance to the baseplate of the near-field scanner is investigated. Finally, the far-field transformation is compared with far-field measurement data from an anechoic chamber to validate the principle.