Examination of the Effectiveness of Far-field Mathematical Absorber Reflection Suppression in a CATR Through Electromagnetic Simulation
IET Microwaves Antennas and Propagation
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For more than a decade now, a measurement and post‐processing technique involving modal filtering, named Mathematical Absorber Reflection Suppression (MARS), has been used very successfully to identify and subsequently extract range reflections in spherical, cylindrical and planar near‐field antenna test systems and far‐field and compact antenna test ranges. Much of the early work concentrated on verification through experimental testing however some additional validation was performed using computational electromagnetic simulations. These considered first far‐field and subsequently near‐field cases. The recent development of an accurate, flexible electromagnetic simulation tool that enables the simulation of “measured” far‐field pattern data as obtained from using a compact antenna test range (CATR) has, for the first time, permitted the careful verification of the far‐field MARS technique for a specified AUT and CATR combination. This paper presents simulated “measured” far‐field antenna pattern data in the presence of a large scatterer and then verifies the successful extraction of the scattering artefacts. In addition to considering range reflections, feed spill‐over is also treated. Results are presented and discussed.