Hybrid multilevel plane wave based near-field far-field transformation utilising combined near- and far-field translations

摘要

The radiation of large antennas and those operating at low frequencies can bedetermined efficiently by near-field measurement techniques and a subsequentnear-field far-field transformation. Various approaches and algorithms havebeen researched but for electrically large antennas and irregular measurementcontours advanced algorithms with low computation complexity are required. Inthis paper an algorithm employing plane waves as equivalent sources andutilising efficient diagonal translation operators is presented. Theefficiency is further enhanced using simple far-field translations incombination with the expensive near-field translations. In this way a lowcomplexity near-field transformation is achieved, which works for arbitrarysample point distributions and incorporates a full probe correction withoutincreasing the complexity.