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- ItemShifted linear systems in electromagnetics : part 1: Systems with intentical right-hand sides(Berlin : Weierstraß-Institut für Angewandte Analysis und Stochastik, 2009) Schlundt, Rainer; Schmückle, Franz-Josef; Heinrich, WolfgangWe consider the solution of multiply shifted linear systems for a single right-hand side. The coefficient matrix is symmetric, complex, and indefinite. The matrix is shifted by different multiples of the identity. Such problems arise in a number of applications, including the electromagnetic simulation in the development of microwave and mm-wave circuits and modules. The properties of microwave circuits can be described in terms of their scattering matrix which is extracted from the orthogonal decomposition of the electric field. We discretize the Maxwell's equations with orthogonal grids using the Finite Integration Technique (FIT). Some Krylov subspace methods have been used to solve multiply shifted systems for about the cost of solving just one system. We use the QMR method based on coupled two-term recurrences with polynomial preconditioning.