This paper describes a new method to control the unlimited use of indoor GSM-devices in vehicles, such as buses and coaches. It permits to develop and to integrate electronic sub-assemblies (ESA) in vehicles. For this purpose a strategy and associated formulas calculating the field strength of cumulative GSM-usage and the shielding effectiveness (if necessary) were developed. This strategy can be summarised as make use of an ESA with a sufficient radiated immunity level and provide a sufficient distance between the susceptible ESA and associated cables and the GSM's. Based on the actual (tested) compliance level for radiated immunity (with AM modulation) of an ESA, the maximum power-level of the mobile phone(s), the gain of the GSM-antenna, the number of GSM's operating in the same time slot, the Q-factor originated by resonance-effects and the influence of the GSM-modulation, the necessary shielding effectiveness can be calculated if the compliance level of the ESA is insufficient. The formula was validated on a real case study: an ESA with a known (low) compliance level integrated in a vehicle. Shielding materials were selected and implemented on a mock-up of a compartment of the vehicle. The theoretical requested shielding-effectiveness for both ESA and connection wires was achieved.
Modelling of radiated immunity for indoor GSM-applications in vehicles
2004
5 Seiten, 9 Bilder, 6 Quellen
Aufsatz (Konferenz)
Englisch
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