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Hybrid electric vehicles require careful dealing with EMC because in HEV's analog and digital circuitry coexist in the vehicle's enclosed environment. These lead to a requirement of advanced methods for the increased requirements for electromagnetic compatibility and analysis and reduction of EMI [1]. There are many methods to increase EMI resistance of a hybrid car's electronics systems implemented printed circuit board, several of which will be reviewed in the current paper. In this review paper, we explain conducted and radiated emission avoidance methods using isolation amongst several subsystems. Within the harsh EM environment of a modern hybrid car, isolation between systems of differing frequencies is an effective method for reducing EMI/EMC issues. These techniques include usage of filters to hinder conducted emissions and shielding to stop radiated emissions.

In automotive industry, to deal with EMI problems, an efficient and proper screening attenuation measurement method is needed to make high performance and low cost shielded electrical wiring harness. Previously a screening attenuation measurement method titled PHSA (Power Harness screening attenuation) method [ 1 ] was proposed to measure screening attenuation in shielded power cable, which evaluates the shielding performance that prevents radiation from inner core to outside environment. The method was used to practically check the effects on performance of cable shield (shield effectiveness) due to different combinations of length and braid density against radiated noise. But the measurement time for actually performing experimental tests limits measurable combinations to evaluate the shielding performance of the wiring harness.