Krylov model-order reduction expansions for electromagnetic wave fields in strongly resonating structures

In this paper we demonstrate the effectiveness of Krylov subspace model-order reduction techniques to simulate wave field propagation in strongly resonating structures. By utilizing an optimal complex-scaling method that simulates the extension to infinity, we show that Krylov reduction allows for effective wave field computations and dominant open resonant modes can be obtained at negligible additional costs as well. A number of numerical examples illustrate the performance of the proposed Krylov reduced-order modeling technique.