TY - JOUR
T1 - Higher order diffractions from a circular disk
AU - Marsland, Diane P.
AU - Balanis, Constantine
AU - Brumley, Stephen A.
N1 - Funding Information:
Manuscript received August 11, 1986; revised May 7, 1987. This work was supported by the Government Electronics Group of Motorola, Inc., under Contract XXP729 andb y NASA Langley ResearchC enter Grant NAG-1-562. D. P. Marsland was with the Department of Electrical and Computer Engineering, College of Engineering and Applied Sciences, Arizona State University, Tempe, AZ. She is now with SFU International, Menlo Park, CA 94025. C. A. Balanis is with the Department of Electrical and Computer Engineering, College of Engineering and Applied Sciences, Arizona State University, Tempe, AZ 85287. S. A. Brumley is with the Government Electronics Group, Motorola, Inc., Scottsdale, AZ 85252. IEEE Log Number 8717290.
PY - 1987/12
Y1 - 1987/12
N2 - The backscattering from a circular disk is analyzed using the geometrical theory of diffraction (GTD). First-, second-, and third-order diffractions are included in the hard polarization analysis, while first-, second-, and second-order slope diffractions are included for soft polarization. Improvements in the prediction of the monostatic radar cross section (RCS) over previous works are noted. For hard polarization, an excellent agreement is exhibited between experimental and theoretical results, while a very good agreement is noted for soft polarization. To further improve the soft polarization results for wide angles, a model for the creeping wave or circulating current on the edge of the disk is obtained and used to find an additional component of the backscattered field. The addition of this component significantly improves the results for wide angles, leading to excellent agreement for soft polarization also. An axial caustic correction method using equivalent currents is also included in the analysis.
AB - The backscattering from a circular disk is analyzed using the geometrical theory of diffraction (GTD). First-, second-, and third-order diffractions are included in the hard polarization analysis, while first-, second-, and second-order slope diffractions are included for soft polarization. Improvements in the prediction of the monostatic radar cross section (RCS) over previous works are noted. For hard polarization, an excellent agreement is exhibited between experimental and theoretical results, while a very good agreement is noted for soft polarization. To further improve the soft polarization results for wide angles, a model for the creeping wave or circulating current on the edge of the disk is obtained and used to find an additional component of the backscattered field. The addition of this component significantly improves the results for wide angles, leading to excellent agreement for soft polarization also. An axial caustic correction method using equivalent currents is also included in the analysis.
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U2 - 10.1109/TAP.1987.1144034
DO - 10.1109/TAP.1987.1144034
M3 - Article
AN - SCOPUS:0023603047
SN - 0018-926X
VL - 35
SP - 1436
EP - 1444
JO - IEEE Transactions on Antennas and Propagation
JF - IEEE Transactions on Antennas and Propagation
IS - 12
ER -