US 12,467,963 B2
Method of evaluating an electromagnetic field
Benoit Derat, Munich (DE); Mert Celik, Munich (DE); Winfried Simon, Kamp-Lintfort (DE); and David Schaefer, Kamp-Lintfort (DE)
Assigned to Rohde & Schwarz GmbH & Co. KG, Munich (DE); and IMST GmbH, Kamp-Lintfort (DE)
Filed by Rohde & Schwarz GmbH & Co. KG, Munich (DE); and IMST GmbH, Kamp-Lintfort (DE)
Filed on Aug. 2, 2023, as Appl. No. 18/364,218.
Prior Publication US 2025/0044334 A1, Feb. 6, 2025
Int. Cl. G01R 29/08 (2006.01); G01R 29/10 (2006.01)
CPC G01R 29/0892 (2013.01) [G01R 29/10 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method of evaluating an electromagnetic field of a device under test, wherein the method comprises:
providing a device under test that radiates an electromagnetic field,
performing a measurement of the device under test in order to obtain measurement data, wherein at least two components of the electromagnetic field of the device under test are measured with regard to their magnitude and phase over a measurement surface,
determining an equivalent source of the device under test based on the measurement data, wherein the equivalent source has a source surface that is different than the measurement surface,
providing a model that comprises the equivalent source determined and at least one modeled scatterer, wherein the equivalent source determined is used as an excitation source,
creating a monitoring surface that encompasses the equivalent source with its source surface, but does not encompass the at least one modeled scatterer or cross the at least one modeled scatterer,
calculating an electromagnetic field of the equivalent source over the monitoring surface,
evaluating a total radiated power based on the electromagnetic field of the equivalent source calculated over the monitoring surface in presence of the at least one modeled scatterer, and
determining at least one normalization factor based on the total radiated power determined and the measurement data.