Fast RCS computation over a frequency band using method of moments in conjunction with asymptotic waveform evaluation technique

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 the 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.

[1]  C. Cockrell,et al.  Asymptotic Waveform Evaluation (AWE) Technique for Frequency Domain Electromagnetic Analysis , 1996 .

[2]  E. K. Miller,et al.  Using model-based parameter estimation to increase the efficiency of computing electromagnetic transfer functions , 1989 .

[3]  D. Wilton,et al.  Electromagnetic scattering by surfaces of arbitrary shape , 1980 .

[4]  Z. Cendes,et al.  Spurious modes in finite-element methods , 1995 .

[5]  Michel Nakhla,et al.  Asymptotic waveform Evaluation , 1994 .

[6]  T. K. Tang,et al.  Analysis of lossy multiconductor transmission lines using the asymptotic waveform evaluation technique , 1991 .

[7]  Jin-Fa Lee,et al.  Fast frequency sweep technique for the efficient analysis of dielectric waveguides , 1997 .

[8]  Lawrence T. Pileggi,et al.  Asymptotic waveform evaluation for timing analysis , 1990, IEEE Trans. Comput. Aided Des. Integr. Circuits Syst..

[9]  E. K. Miller,et al.  Using model-based parameter estimation to increase the physical interpretability and numerical efficiency of computational electromagnetics , 1991 .

[10]  John L. Volakis,et al.  AWE implementation for electromagnetic FEM analysis , 1996 .

[11]  E. K. Miller,et al.  Computational electromagnetics : frequency-domain method of moments , 1992 .

[12]  M. Deshpande,et al.  Application of AWE for RCS Frequency Response Calculations Using Method of Moments , 1996 .

[13]  E. H. Newman,et al.  Generation of wide-band data from the method of moments by interpolating the impedance matrix (EM problems) , 1988 .