Abstract
Parasitic capacitances in a printed circuit boards (PCB) or very high frequency transmission lines causes signal delay, transmission losses and RF electromagnetic field radiation. But it is difficult to identify parasitic capacitance in a PCB or devices. This paper proposes an approach to identify parasitic capacitance distribution in a micro strip line (MSL). At first, this paper describes that current distributions in cross section are calculated from difference between two points of measured magnetic fields for transmission direction. Magnetic fields are simulated by means of the finite difference time domain (FDTD) method. Comparison capacitance in a MSL obtained from identified current distribution with by conventional experimental approach is demonstrated that the presented approach is capable of identifying currents caused by parasitic capacitances on PCB circuits.
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