Analysis of UWB Antenna with the MoM Based on RWG-SWG Hybrid Basis Function.

In view of the insufficient theoretical analysis of UWB antenna by the method of moments (MoM), the detailed process of analyzing UWB antenna by the MoM is presented comprehensively. UWB antenna can be divided into triangle and tetrahedron subdivisions. The surface current distribution is represented by triangle basis function, and the electric displacement vector is represented by tetrahedron basis function. The impedance matrix is divided into four parts: conductor-to-conductor, conductor-to-dielectric, dielectric-to-conductor and dielectric-to-dielectric. The boundary conditions between conductor and dielectric are considered. The formulas for calculating the impedance and current coefficients are obtained. The above algorithm is used to calculate S11 of UWB antenna. The simulated results with FEKO agree well with the results calculated with program, which shows that the algorithm is correct and effective. The realization of this algorithm lays a solid theoretical foundation and provides a good guidance for the optimization and design of UWB antenna.