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This paper presents a novel modeling technique for traces that cross a defected ground structure. A simple and accurate equivalent circuit model provides clear insight into the coupling mechanism between a microstrip line and a slot or split. The circuit models consist of a transformer as the coupling mechanism and LC resonators as the ground with a slot or split structure. Resistors, capacitors, and inductors are added to the model to increase accuracy and equivalence at high frequency. Simulated and measured S-parameters are presented for defected ground structures. The accuracy and validity of the proposed equivalent circuit model is verified by evaluation of the S-parameter characteristics of the defected ground structures and comparison with measured results.

In this paper, conducted emission from the LDC(Low-Side DC/DC Converter) of a HEV/EV was analyzed using high-frequency circuit modeling in system-level approach. The conducted emission by PWM process(100 kHz; Switching Frequency) can cause RFI(Radio-Frequency Interference) problems in the AM/FM frequency range. In order to mitigate this conducted emission, a high-frequency equivalent circuit model is proposed by analyzing the fundamental circuits, parasitic components in their parts and connections and non-linear characteristics of MOSFETs, high-power capacitors, inverters, motors, high-power cables, and bus bars which are composed of the LDC. Using these circuit models, results of both simulation and measurement were compared and similarities between them were verified. We are looking forward that this approach can be effectively used in the EMC design of HEV/EV.

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= Angle between {i} th and {i+1} th X-axis along {i} th Z-axis (i =1 ~ 6), rad = Link offset between {i} th and {i+1} th X-axis along {i} th Z-axis (i =1 ~ 6), mm = Angle between {i} th and {i+1} th Z-axis along {i} th X-axis (i =1 ~ 6), rad = Link offset between {i} th and {i+1} th Z-axis along {i} th X-axis (i =1 ~ 6), mm = Coordinate system with respect to {i} th joint (i = 0 ~ 6, t), t stands for a tool's coordinate system = radial distance between circular path's center and a measured point.