Title :
Combined plane wave — Point source near-field far-field transformation for short measurement distances
Author :
Schmidt, Carsten H. ; Schobert, Dennis T. ; Eibert, Thomas F.
Author_Institution :
Lehrstuhl fur Hochfrequenztech., Tech. Univ. Munchen, Munich, Germany
Abstract :
The radiation behavior of an antenna can be characterized by a measurement in its radiating near field followed by a near-field far-field transformation. Many transformation algorithms utilize source expansions employing higher order Hankel functions. These Hankel functions are known to become singular for small arguments corresponding to short measurement distances or to a low frequency of the respective antenna excitation. In this paper a point source modeling approach is discussed which relates the measured field samples by direct evaluation of the Green´s function. In this way the formulation remains stable even for very close measurements. In order to reduce the computational effort of the technique for larger problems it is combined with the plane wave based near-field far-field transformation algorithm, which handles those measurement points with sufficient separation from the antenna under test.
Keywords :
Green´s function methods; antenna testing; antenna theory; computational electromagnetics; distance measurement; electromagnetic field theory; Green´s function; antenna excitation; antenna radiation behavior; antenna under test; combined plane wave-point source near-field far-field transformation algorithm; higher order Hankel functions; measurement points; point source modeling approach; short measurement distances; source expansions; Acceleration; Antenna measurements; Computational modeling; Dipole antennas; Horn antennas; Probes;
Conference_Titel :
Antennas and Propagation (EUCAP), 2012 6th European Conference on
Conference_Location :
Prague
Print_ISBN :
978-1-4577-0918-0
Electronic_ISBN :
978-1-4577-0919-7
DOI :
10.1109/EuCAP.2012.6205954