A Resonance-Free Magnetic Field Integral Equation with Improved Accuracy

The surface integral equations are widely used in the method of moments (MOM) for electromagnetic simulations, and the electric field integral equation (EFIE) and magnetic field integral equation (MFIE), and combined field integral equation (CFIE) of MOM are often applied to solving the scattering and radiation problems of perfectly electrically conducting (PEC) objects. However, EFIE, MFIE and CFIE suffer from a series of problems which may vastly reduce the efficiency and accuracy of MOM. First, EFIE and MFIE do not have a unique solution at the internal resonant frequencies of a closed structure, which results in the problem of internal resonances [1] . CFIE which combines EFIE and MFIE, is the most attractive approach to handle with this issue. Unfortunately, this combination makes CFIE affected by the following problems of EFIE. Second, EFIE suffers from the problem of the low-frequency breakdown [2] and dense-discretization breakdown [3] , and it means CFIE is also influenced by this problem. Third, EFIE, MFIE and CFIE have the low-frequency inaccuracy problem for some applications such as the far-field computation [4] , [5] . Finally, the result of MFIE is usually more inaccurate than that of EFIE [6] .