Abstract
The Finite Difference Time Domain (FDTD) method has been broadly applied to solve a variety of electromagnetic problems and phenomena [1, 2]. Though one of major advantages of the FDTD algorithm is easily handling complex environment electromagnetic problems, we have to modify the FDTD update equations when it is employed to a simple circuit element such as a resistor, a capacitor or an inductor. Consequently, this modification will degrade the FDTD performance and flexibility. In the conventional FDTD approach, a circuit element is introduced into the FDTD simulation via a current that flows through the circuit element since only a current can be enforced to generate electromagnetic field in Maxwell's equations. The implementation of a resistor and capacitor is much simpler than an inductor due to the requirement of the field convolution operation for an inductor. The literature [1-4] has expressed a resistor and a capacitor as the conductivity and permittivity, respectively, even if they do not explicitly mention this corresponding relationship. In contrast to the resistor and capacitor, the inductor is more involved since it requires a time convolution in the updating equations.