Title :
Non-principal plane scattering from perfectly conducting, flat, rectangular plates
Author :
Polka, L.A. ; Balanis, C.A.
Author_Institution :
Dept. of Electr. & Comput. Eng., Arizona State Univ., Tempe, AZ, USA
Abstract :
GTD (geometrical theory of diffraction) and PO/PTD (physical optics/physical theory of diffraction) equivalent currents are used to predict the far-field monostatic scattering from perfectly conducting, flat, rectangular plates in nonprincipal planes. To determine the accuracy of the GTD and PO/PTD equivalent currents, computations were made for a square plate with a width of 5.73 lambda . The equivalent current results are compared to moment-method (MM) computations and experimental measurements performed in an anechoic chamber. The GTD and PO/PTD equivalent currents results agree for angles away from grazing and near-grazing. For monostatic predictions, the GTD currents are as accurate as the PO/PTD equivalent currents; however, in bistatic calculations, the GTD currents contain infinite discontinuities which the PO/PTD currents avoid. The equivalent current predictions agree well with MM and experimental results for observation angles up to 45 degrees from normal incidence.<>
Keywords :
electromagnetic wave diffraction; electromagnetic wave scattering; radar cross-sections; GTD; PO/PTD; anechoic chamber; equivalent currents; far-field monostatic scattering; far-grazing angles; geometrical theory of diffraction; infinite discontinuities; moment-method; near-grazing; nonprincipal planes; normal incidence; observation angles; perfectly conducting flat rectangular plates; physical optics/physical theory of diffraction; radar cross-sections; square plate; Apertures; Current measurement; Geometry; Moment methods; Performance evaluation; Physical theory of diffraction; Polarization; Predictive models; Radar scattering; Strips;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1989. AP-S. Digest
Conference_Location :
San Jose, CA, USA
DOI :
10.1109/APS.1989.134944