Tensor Product Derivative Matching for Wave Propagation in Inhomogeneous Media

We propose a tensor product derivative matching (TPDM) method to restore the accuracy of high-order finite difference time-domain (FDTD) schemes of computational electromagnetics (CEM) Figure 4 Measurement results of reverse-transmission gain and outputreturn loss for GaInP/GaAs HBT wideband amplifiers with and without emitter peaking Figure 5 Measured ZT and Z21 of GaInP/GaAs HBT wideband amplifiers with and without emitter peaking Figure 6 Measured noise figures and power performances of GaInP/ GaAs HBT wideband amplifiers with and without emitter peaking MICROWAVE AND OPTICAL TECHNOLOGY LETTERS / Vol. 43, No. 1, October 5 2004 69 with material interfaces in two spatial dimensions (2D). By making use of fictitious points, the TPDM method locally enforces the physical-jump conditions at material interfaces in a preprocessing stage to arbitrarily high orders of accuracy in principle, based on a structured grid. The proposed method encompasses a variety of schemes of different orders in a single code. In fact, numerical orders from 2 to near 16 are confirmed in the present study. To the best of our knowledge, such high orders have not been reported in the literature for CEM problems involving material interfaces. The limitation and applicability of the present scheme are also analyzed in detail. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 43: 69–77, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop. 20378