Accession Number : AD0657356

Title :   RESEARCH INTO THE SCATTERING OF ELECTROMAGNETIC ENERGY FROM HIGHLY CONDUCTING BODIES.

Descriptive Note : Final rept. 1 Mar 64-28 Feb 67,

Corporate Author : OHIO STATE UNIV COLUMBUS ELECTROSCIENCE LAB

Personal Author(s) : Kennaugh,E. M. ; Moffatt,D. L. ; Schafer,R. C.

Report Date : 24 MAY 1967

Pagination or Media Count : 56

Abstract : The report summarizes research during the period March 1, 1964, to March 1, 1967, under Contract AF 19(628)-4002, on the subject: Scattering of Electromagnetic Energy from Highly Conducting Bodies. The purpose of this research is to improve theoretical methods for the analysis of scattering problems involving arbitrary transient electromagnetic fields and to apply such methods to specific scattering shapes. The report is contained in three sections. In Section I, the transient response of finite bodies at great distances is discussed. An incident plane electromagnetic wave of impulse, step, or ramp function time-dependence is incident upon an object, and the time-dependent waveforms scattered in various directions are of interest. The approximation of these waveforms by several methods is considered, as well as the interpretation and further uses of the waveforms, when determined. Section II is concerned with the near-zone behavior of the transient electromagnetic fields for the same forms of plane wave illumination. Theoretical techniques for approximating the waveforms associated with particular components of the electromagnetic field on the surface of a conducting scatterer are investigated and compared with exact or numerical solutions in specific cases. Section III discusses experimental techniques for investigating the scattering of transient plane waves by objects. In particular, the use of continuous-wave reflection-measuring systems at a number of harmonically related frequencies to estimate the ramp response waveform of simple objects is considered. (Author)

Descriptors :   (*ELECTROMAGNETIC RADIATION, *SCATTERING), THEORY, ELECTROMAGNETIC FIELDS, ILLUMINATION, RESPONSE, TRANSIENTS, REFLECTION, MEASUREMENT, APPROXIMATION(MATHEMATICS), FREQUENCY

Subject Categories : Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE