Simultaneous Computation of Wide-Angle and Wide-Band Base on Asymptotic Waveform Evaluation

The radar cross section (RCS)of a target is dependent on frequency as well as observation angle. the asymptotic waveform evaluation (AWE) technique is applied to predict the mono-static RCS of an arbitrarily shaped two-dimensional cylinder in both frequency and angular domains. the method of moments was used to solve the electric field integral equation, and the surface electric current density for a single angle and frequency was obtained. In the AWE technique, the surface current on the perfect electric conductor is expanded in a rational function via the Padé approximation. Using the function, the electric current distribution can be obtained at any angle and frequency within given angle and frequency range, which is used to compute the wide-angle and wide-band RCS. The numerical results are in good agreement with the results obtained by the method of moments at each frequency.