Application of characteristic modes to the analysis of scattering from microstrip antennas

In this work, Characteristic Modes in conjunction with Spectral Domain Mome nt Method are used for the efficient analysis of the scattering from arrays of arbitrarily shaped microstrip patches. In the following the Theory of C haracteristic Modes for a general arrays of patches is presented. The metho d is tested by considering simple structure composed by two patches only bu t it can be extended to larger arrays. Computed results are found to be in excellent agreement with results obtained by standard MoM with subdomain ba sis functions. Since a small number of characteristic modes are necessary t o yield a good approximation of the induced current on patches, the propose d method dramatically reduce the number of unknowns and the corresponding c omputational effort in the MoM solution of the problem. For this reason it allows the analysis of larger arrays with direct inversion methods.