The characterisation of antenna radiation patterns by measurements in thenear-field and a following near-field far-field transformation requireaccurate amplitude and phase data. Especially at higher frequencies phasemeasurements are demanding in terms of instrumentation and measurementaccuracy. Phaseless techniques which require amplitude only data on one ormore measurement surfaces are therefore of special interest. In this paper aphaseless spherical algorithm based on spherical modal expansion ispresented. The algorithm works with amplitude only near-field data measuredon two spheres of different radii and is therefore not restricted to certaintypes of antennas as for planar measurements for example. Simulated as wellas measured results of low and medium gain antennas are shown.
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