Surface Current Determination from Localized Measurements
Final rept. 1 Jan 1997-31 DEc 1999
GEORGIA TECH RESEARCH INST ATLANTA
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This report describes the results of a research program aimed at developing and demonstrating a technique for determining surface currents from a series of electromagnetic field measurements. Two back-propagation techniques were developed and validated through numerical simulations and measurements on laboratory-scale, conducting objects. The first technique is a planar spectral decomposition approach that utilizes magnetic field measurements on a plane in front of the body, and the second i a local back-propagation technique that operates using magnetic field measurements at a much smaller number of sample points. The back-propagation techniques were demonstrated through measurements on a series of laboratory-scale targets, including solid metallic plates, metallic plates with slots, and more complex objects, such as a scale-model ship and a frequency selective surface. The back-propagated results were compared to predictions of the surface current obtained using a finite difference time domain numerical code. The predicted and experimental results are in agreement, validating the back- propagation approaches for these targets. This report contains a description and analysis of the back-propagation techniques, details of the measurements, and representative results.
- Radiofrequency Wave Propagation