Spherical near-field far-field transformation with infinite ground plane at arbitrary height z

In measurement scenarios with ground planes the boundary condition has to be included appropriately in the near-field to far-field transformation. For spherical near-field antenna measurements, techniques exist to include a ground plane in the xy-plane (z = 0m). In this paper, we will describe a transformation procedure including a translation of the transformation origin, so that the ground plane can be at any height ζ to overcome that limitation of existing techniques. The procedure is demonstrated by a simulation and measurement example.

[1]  Bradley K. Alpert,et al.  Near-field antenna measurements using nonideal measurement locations , 1997 .

[2]  Clive Parini,et al.  Spherical near-field antenna measurements , 2014, Theory and Practice of Modern Antenna Range Measurements, 2nd Expanded Edition, Volume 2.

[3]  E. D. Giampaolo.  A NUMERICAL FILTER TO REMOVE THE FIELD SCATTERED BY THE EDGES OF A FINITE GROUND PLANE FROM MEASURED DATA , 2008 .

[4]  Dirk Heberling,et al.  Investigation of different matrix solver for spherical near-field to far-field transformation , 2015, 2015 9th European Conference on Antennas and Propagation (EuCAP).

[5]  F. Saccardi,et al.  Spherical Near Field offset measurements using downsampled acquisition and advanced NF/FF transformation algorithm , 2016, 2016 10th European Conference on Antennas and Propagation (EuCAP).