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IEEE Transactions on Antennas and Propagation
Volume 46 Number 8, August 1998

Fast RCS Computation over a Frequency Band Using Method of Moments in Conjunction with Asymptotic Waveform Evaluation Technique

Page 1229.

Abstract:

The method of moments (MoM) in conjunction with the asymptotic waveform evaluation (AWE) technique is applied to obtain the radar cross section (RCS) of an arbitrarily shaped three-dimensional (3-D) perfect electric conductor (PEC) body over a frequency band. The electric field integral equation (EFIE) is solved using MoM to obtain the equivalent surface current on the PEC body. In the AWE technique, the equivalent surface current is expanded in a Taylor's series around a frequency in the desired frequency band. The Taylor series coefficients are then matched via the Pade approximation to a rational function. Using the rational function, the surface current is obtained at any frequency within the frequency range, which is in turn used to calculate the RCS of the 3-D PEC body. A rational function approximation is also obtained using the model-based parameter estimation (MBPE) method and compared with the Pade approximation. Numerical results for a square plate, a cube, and a sphere are presented over a frequency bandwidth. Good agreement between the AWE and the exact solution over the bandwidth is observed.

References

1. E. K. Miller, L. Medgysi-Mitschang, and E. H. Newman, Eds., Computational Electromagnetics: Frequency Domain Method Of Moments.New York: IEEE Press, 1992.
2. E. H. Newman, "Generation of wide-band data from the method of moments by interpolating the impedance matrix," IEEE Trans. Antennas Propagat., vol. 36, pp. 1820-1824, Dec. 1988.
3. G. J. Burke, E. K. Miller, S. Chakrabarthi, and K. Demarest, "Using model-based parameter estimation to increase the efficiency of computing electromagnetic transfer functions," IEEE Trans. Magn., vol. 25, pp. 2807-2809, July 1989.
4. L. T. Pillage and R. A. Rohrer, "Asymptotic waveform evaluation for timing analysis," IEEE Trans. Comput.-Aided Design, pp. 352-366, Apr. 1990.
5. T. K. Tang, M. S. Nakhla, and R. Griffith, "Analysis of lossy multiconductor transmission lines using the asymptotic waveform evaluation technique," IEEE Trans. Microwave Theory and Techniques, vol. 39, pp. 2107-2116, Dec. 1991.
6. D. Sun, J. Manges, X. Yuan, and Z. Cendes, "Spurious modes in finite element method," IEEE Antennas Propagat. Mag., vol. 37, pp. 12-24, Oct. 1995.
7. J. Gong and J. L. Volakis, "AWE implementation for electromagnetic FEM analysis," Electron. Lett., vol. 32, pp. 2216-2217, Nov. 1996.
8. C. R. Cockrell and F. B. Beck, "Asymptotic waveform evaluation (AWE) technique for frequency domain electromagnetic analysis," NASA Tech. Memo 110292, Nov. 1996.
9. C. J. Reddy and M. D. Deshpande, "Application of AWE for RCS frequency response calculations using method of moments," NASA Contractor Rep. 4758, Oct. 1996.
10. S. V. Polstyanko, R. Dyczij-Edlinger, and J. F. Lee, "Fast frequency sweep technique for the efficient analysis of dielectric waveguides," IEEE Trans. Microwave Theory Tech., vol. 45, pp. 1118-1126, July 1997.
11. E. K. Miller and G. J. Burke, "Using model based parameter estimation to increase the physical interpretability and numerical efficiency of computational electromagnetics," Comput. Phys. Commun., vol. 68, pp. 43-75, 1991.
12. S. M. Rao, D. R. Wilton, and A. W. Glisson, "Electromagnetic scattering by surfaces of arbitrary shape," IEEE Trans. Antennas Propagat., vol. AP-30, pp. 409-418, May 1982.
13. E. Chiprout and M. S. Nakhla, Asymptotic Waveform Evaluation.Norwell, MA: Kluwer, 1994.