Investigation of Radiated Emissions from GPS Based Vehicle Tracking System Board and it's comparison with different EMI /EMC Standards and Remedies to reduce the Radiations

Jog, Shreenivas R.; Sutaone, M. S.; V. Badawe, V.
April 2012
International Journal of Computer & Electrical Engineering;Apr2012, Vol. 4 Issue 2, p127
Academic Journal
In this research proposal, the Radiated Emissions from GPS based Vehicle Tracking System board (GPRS Based) have been investigated by using Agilent make Spectrum Analyser E4411-B, close-field EMI Probes 11940A and 11941A. Observations for Radiated Emissions are presented here as E-Field Strength, H-Field Strength and S-Power Density. Several techniques / methods to reduce radiation problems are studied and discussed. The ruggedised EMI enclosures using Aluminum, Silver filled conductive gaskets and Copper foil with conductive adhesives have been designed for GPS VTS (GPRS based) board. By implementation of EMI enclosure, the radiated emission reduced by around 20dB. The GPS VTS board with enclosure has been tested in the national EMI laboratory. These levels have been compared with EMI/EMC (Electromagnetic Interference/Electromagnetic Compatibility) standards like MIL-STD-461E and CISPR. The measured radiation level in frequency band 30MHz to 2.5GHZ has been restricted to around 25 dB μV/m in horizontal and vertical directions. The Radiated Emission level in frequency band 150 KHz to 30 MHz has been found to be just at the border of MIL-461E. This level can be reduced by using Magnetic material like MuFerro 6800 sheet in enclosure. The designed enclosure meets compatibility requirements for Radiated Emission as per MIL-STD-461E, CISPR standard and radiation reduced to safer level for human being.


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