Steady-state scattering from microstrip dipole and patch antennas evaluated by the singularity expansion method

The singularity expansion method (SEM) is used to study plane-wave scattering from microstrip antennas embedded in multilayered media. Patches and dipoles are considered for this investigation. The scattered fields of microstrip antennas are found by exploiting a singularity expansion of the antenna current, leading to coupling coefficients which quantify the coupling between the antenna current and the impressed radiation. Scattering from a microstrip dipole is shown, where the SEM is compared to the MoM (method of moments) solution. The SEM solution is found to be in good agreement with the MoM solution, and is obtained analytically once the dipole´s eigenmodes are found.<>