FAST FREQUENCY SWEEP TECHNIQUE FOR THE EFFICIENT ANALYSIS OF DIELECTRIC WAVE-GUIDES

This paper describes a new approach to spectral response computations of an arbitrary tao-dimensional (2-D) waveguide. This technique is bas ed on the tangential-vector finite-element method (TVFEM) in conjuncti on with the asymptotic waveform evaluation (AWE) technique, The former is used to obtain modes characteristics for a central frequency, wher eas the latter employs an efficient algorithm to compute frequency mom ents for each mode. These moments are then matched via Fade approximat ion to a reduced-order rational polynomial, which can be used to inter polate each mode over a frequency band with a high degree of accuracy, Furthermore, the moments computations and subsequent interpolation fo r a given set of frequency points can be done much more rapidly than j ust simple simulations for each frequency point.