Electromagnetic Scattering from Impedance Strips and Impedance-Loaded Conducting Strips.
Heaton, Marck C.
MetadataShow full item record
This paper investigates the scattering from impedance strips and impedance-loaded conducting strips. The UTd diffraction coefficient for an edge in a conductor is heuristically modified for impedance edges and junctions. Essentially, this is done by scaling the UTD diffraction coefficients according to changes in the geometrical optics field. The new diffraction coefficients are then used to investigate the scattering from impedance strips and impedance- loaded conducting strips. Both uniform and tapered impedances are considered. Results are compared to moment method and physical optics predictions and to measured data. The scattering pattern of a uniform impedance strip was seen to behave as that for a conducting strip, but at a lower level. However, tapering the impedance was seen to significantly decrease the sidelobe levels relative to the main lobe. Also, applying an impedance load to a conducting strip reduced the sidelobe levels. This was most pronounced for loads of tapered impedance. the modified UTD approach accurately predicted the sidelobe levels and locations for the simple impedance strips, and worked fairly well for the impedance-loaded conducting strips. The predictions for all geometries were better near broadside incidence than near edge-on.
Approved for public release; distribution unlimited.
Showing items related by title, author, creator and subject.
5th Annual Review of Progress in Applied Computational Electromagnetics at the Naval Postgraduate School, Monterey, CA, March 20-24, 1989, Conference Proceedings Unknown author (Monterey, California. Naval Postgraduate School, 1989-03);Contents: General Purpose Electromagnetic Codes; Comparison of Antenna and Scattering Patterns by the NEC and ESP Codes; Junction: A Computer Code for the Computation of Radiation and Scattering by Arbitrary Conducting ...
Radiation hazard evaluation for a high power mobile electromagnetic radiation weapon using the numerical electromagnetic code Koh, W. J. (Monterey, California: U.S. Naval Postgraduate School, 1987-03); NPS 62-87-008It is well known that classical ECM techniques against an incoming active missile attack is effective only at distances where the jamming signal to missile return signal ratio is high. There is no guarantee that it will ...
Bedard, Raynald (Monterey, California: U.S. Naval Postgraduate School, 1987);a method for determining the free-field open circuit voltage sensitivity of a reversible underwater electroacoustic transducer from the difference in its input electrical impedance when loaded by water and air was investigated ...