Spatial domain Green's functions for planar multilayered structures



This paper presents a robust approach for calculating spatial-domain Green's functions on the interface or close to the interface of planar multilayered microstrip structures with lossless or lossy dielectric materials for a wide range of frequencies and layer thicknesses. We compute the mixed potential Green's functions for distance ρ for 200 points from 0.1 to 10 wavelengths. The CPU is less than 30 s for each frequency on a Pentium-IV 2.4-GHz PC. In the case of moderate layer thickness, the fast Fourier transform (FFT) method is introduced to the half-space extraction method in order to calculate all ρ values of the different radial source-to-field separations simultaneously. For thin layers, the results are computed by the contributions of the vertical-branch cut and the addition of a surface-wave pole. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 44: 86–91, 2005; Published online in Wiley InterScience ( DOI 10.1002/mop.20555