Simultaneous extrapolation of RCS in both angular and frequency domains based on AWE technique

Abstract

AbstractThe radar cross section (RCS) of a target is dependent on frequency as well as angle. The method of moments (MoM) in conjunction with the asymptotic waveform evaluation (AWE) technique is applied to predict the monostatic RCS of an arbitrarily shaped two‐dimensional cylinder in both the frequency and angular domains simultaneously. The electric‐field integral equation (EFIE) of the cylinder is solved using the MoM to obtain the equivalent current on the cylinder. In the AWE technique, the equivalent current at a given frequency and angle is expanded in the desired frequency and angle band in a binomial Taylor's series. The binomial Taylor's series coefficients are then matched via the Pade approximation to a rational function. Using the rational function, the current is obtained at any frequency and angle within the interesting frequency and angular range, which is in turn used to calculate the RCS of the cylinder. The use of this method for extrapolation of the RCS has at least two significant advantages: one being the obtained RCS analytical formulas, and the other being a significant decrease in the amount of time required for modeling problems with large computational domains. © 2002 John Wiley & Sons, Inc. Microwave Opt Technol Lett 32: 290–293, 2002.