RADIATION-PATTERNS OF LINE SOURCES MOUNTED IN A MULTI-DIELECTRIC SUBSTRATE MEDIUM

The far-field of line sources lying between the slabs of a multi-diele ctric substrate are presented. Such a configuration is usual in the te chnology of microstrips as well as in remote sensing. The electric fie ld in the 2-D wave equation is expressed as a Fourier integral of the potential V(y,h). The coefficients of the solution are found from the boundary conditions at the interfaces of the substrate. The main concl usion is the similarity between the patterns from a line source and a complex array of sources in free space. The ray optical techniques due to multi-reflection and refraction fail for more than three substrate s, while our procedure can be applied for any set of lossless or lossy substrates.