A method to reduce truncation errors in near-field antenna measurements is presented. The method is based on the Gerchberg-\r\nPapoulis iterative algorithm used to extrapolate band-limited functions and it is able to extend the valid region of the calculated\r\nfar-field pattern up to the whole forward hemisphere. The extension of the valid region is achieved by the iterative application of a\r\ntransformation between two different domains. After each transformation, a filtering process that is based on known information\r\nat each domain is applied. The first domain is the spectral domain in which the plane wave spectrum (PWS) is reliable only within\r\na known region. The second domain is the field distribution over the antenna under test (AUT) plane in which the desired field\r\nis assumed to be concentrated on the antenna aperture. The method can be applied to any scanning geometry, but in this paper,\r\nonly the planar, cylindrical, and partial spherical near-field measurements are considered. Several simulation and measurement\r\nexamples are presented to verify the effectiveness of the method.
Loading....