A new approach for microstrip active antennas using modal F.F.T-algorithm

A full-wave fast wave concept iterative technique is developed to analyze single and stacked microstrip active antennas with arbitrary shape. The wave concept is developed to express the boundary conditions on the radiating surfaces in term of the waves, which are solved using the iterative technique. With the help of the modal FFT-algorithm an efficient code is developed which allows a rapid and accurate characterization of arbitrary shaped antennas embedded in single and multilayered dielectric without the trial functions usually used in the conventional integral method. The time saving factor is about 20 compared to the conventional numerical integral methods. Field distribution and input admittance are derived.