Formulations for Modeling Voltage Sources with RLC Impedances in the FDTD Method
Keywords:
Finite-difference time-domain method, impedance modeling, source modelingAbstract
Voltage sources are modeled with constant resistive internal impedances when simulated in the finite-difference time-domain (FDTD) method in most of the applications. However, some applications, such as an RFID tag antenna in radiation mode, require modeling of voltage sources with frequency dependent complex impedances. If the frequency dependent behavior of the complex impedance of a voltage source follows that of an RLC circuit, the voltage source can be modeled with an RLC internal impedance in the FDTD method for wide-band simulations. This paper presents FDTD formulations to model a voltage source with an RLC impedance for the cases where the RLC circuit is a series or a parallel connected RL, RC, or an RLC configuration.
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