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Calculation technique to obtain radiated electric far-field from assembled device: chassis with PCB has been investigated. Circuit model including ground and power planes are created in PSPICE in order to calculate frequency spectrum of the current flowing through the screw at different location. Next, simplified 3D chassis model are created with simplified PCB model which does not have any traces...
Correlation between radiated emission from chassis with PCB and the junction current which is the current flowing through screws connecting PCB GND to chassis GND was investigated, and new technique to reduce the junction current was proposed. The measurement results of the junction current frequency spectra showed strong correlation with the emission from chassis with PCB. Also investigation using...
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