Fast and accurate frequency-sweep calculations using asymptotic waveform evaluation and the combined-field integral equation

The method of asymptotic waveform evaluation (AWE) is applied to the combin ed-field integral equation (CFIE) to achieve fast and accurate frequency-sw eep calculations of electromagnetic scattering and radiation by three-dimen sional conducting and dielectric objects. The employment of the CFIE elimin ates the interior resonance problem suffered by both the electric-field int egral equation and the magnetic-field integral equation. It is shown that t he use of AWE can speed up the calculation by more than an order of magnitu de. It is also shown that when combined with the complex frequency hopping technique, the AWE method can produce an accurate solution within a prespec ified frequency band. Numerical examples are presented to demonstrate the p erformance of the proposed method.