Estimation of Characteristics for the Reflective Rectangular Slot Element Using MoM with One Basis Function

Estimation of the reflected field phase, admittance and unknown basis functions coefficients are presented for the case of the single-layer rectangular slot element in unit cell. The analysis is based on a solution of an integral-equation system with the Method of Moments in spectral domain. Only one basis function is used for the analysis. It is shown that this approach provides satisfactory accuracy for the development of the slot reflectarray antennas. Characteristics of the unit cell and reflectarray antennas obtained by proposed approach and full-wave simulations are presented.