An electromagnetically coupled CPW fed patch antenna element

The numerical analysis of a slot antenna with a coplanar feed line is presented. A spectral domain technique with method of moments solution including the exact Green's functions for multiple substrate layers is applied to the integral equation. Appropriate subdomain functions are introduced. Quadrature is done either in the spectral domain or in the spatial domain. For the spatial domain integration a special interpolation technique has been developed. Numerical results and measurements are presented and compared.