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Nonprincipal plane scattering of flat plates and pattern control of horn antennas
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Polka, Lesley A. Balanis, Constantine A. Liu, Kefeng |
| Copyright Year | 1989 |
| Description | Using the geometrical theory of diffraction, the traditional method of high frequency scattering analysis, the prediction of the radar cross section of a perfectly conducting, flat, rectangular plate is limited to principal planes. Part A of this report predicts the radar cross section in nonprincipal planes using the method of equivalent currents. This technique is based on an asymptotic end-point reduction of the surface radiation integrals for an infinite wedge and enables nonprincipal plane prediction. The predicted radar cross sections for both horizontal and vertical polarizations are compared to moment method results and experimental data from Arizona State University's anechoic chamber. In part B, a variational calculus approach to the pattern control of the horn antenna is outlined. The approach starts with the optimization of the aperture field distribution so that the control of the radiation pattern in a range of directions can be realized. A control functional is thus formulated. Next, a spectral analysis method is introduced to solve for the eigenfunctions from the extremal condition of the formulated functional. Solutions to the optimized aperture field distribution are then obtained. |
| File Size | 1184648 |
| Page Count | 49 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19890006725 |
| Archival Resource Key | ark:/13960/t86h9g21m |
| Language | English |
| Publisher Date | 1989-02-01 |
| Access Restriction | Open |
| Subject Keyword | Communications And Radar Anechoic Chambers Flat Plates Horn Antennas Radar Cross Sections Eigenvalues Apertures Surface Properties Radar Scattering High Frequencies Wedges Spectral Methods Antenna Radiation Patterns Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
