TY - JOUR
T1 - Dihedral Corner Reflector Backscatter Using Higher Order Reflections and Diffractions
AU - Griesser, Timothy
AU - Balanis, Constantine
N1 - Funding Information:
Manuscript received March 21, 1986: revised May 15, 1987. This work was supported by the NASA Langley Research Center under Grant NAG-I-562 and by the Office of Naval Research through the ONR Graduate Fellowship Program. The authors arew ith the Department of Electrical and Computer Engineering. Arizona State University. Tempe. AZ 85287. IEEE Log Number 8716777.
PY - 1987/11
Y1 - 1987/11
N2 - The uniform theory of diffraction (UTD) plus an imposed edge diffraction extension is used to predict the backscatter cross sections of dihedral corner reflectors which have right, obtuse, and acute included angles. UTD allows individual backscattering mechanisms of the dihedral corner reflectors to be identified and provides good agreement with experimental cross section measurements in the azimuthal plane. Multiply reflected and diffracted fields of up to third order are included in the analysis for both horizontal and vertical polarizations. The coefficients of the uniform theory of diffraction revert to Keller’s original geometrical theory of diffraction (GTD) in far-field cross section analyses, but finite cross sections can be obtained everywhere by considering mutual cancellation of diffractions from parallel edges. Analytic calculations are performed using UTD coefficients; hence accuracy required in angular measurements is more critical as the distance increases. In particular, the common “far-field” approximation that all rays to the observation point are parallel is too gross of an approximation for the angular parameters in the UTD coefficients in the far field.
AB - The uniform theory of diffraction (UTD) plus an imposed edge diffraction extension is used to predict the backscatter cross sections of dihedral corner reflectors which have right, obtuse, and acute included angles. UTD allows individual backscattering mechanisms of the dihedral corner reflectors to be identified and provides good agreement with experimental cross section measurements in the azimuthal plane. Multiply reflected and diffracted fields of up to third order are included in the analysis for both horizontal and vertical polarizations. The coefficients of the uniform theory of diffraction revert to Keller’s original geometrical theory of diffraction (GTD) in far-field cross section analyses, but finite cross sections can be obtained everywhere by considering mutual cancellation of diffractions from parallel edges. Analytic calculations are performed using UTD coefficients; hence accuracy required in angular measurements is more critical as the distance increases. In particular, the common “far-field” approximation that all rays to the observation point are parallel is too gross of an approximation for the angular parameters in the UTD coefficients in the far field.
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U2 - 10.1109/TAP.1987.1144010
DO - 10.1109/TAP.1987.1144010
M3 - Article
AN - SCOPUS:0023670446
SN - 0018-926X
VL - 35
SP - 1235
EP - 1247
JO - IEEE Transactions on Antennas and Propagation
JF - IEEE Transactions on Antennas and Propagation
IS - 11
ER -