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Modelling and prediction of EMI coupling through antennas mounted on a cylindrical body

In particular, military aircraft have radar and communication equipment placed on them for different control actions. A typical airborne early warning system normally has a large number of intentional emitters and receptors. Electromagnetic interference can easily be coupled through various antennas used for these purpose. In this paper an aircraft fuselage is modelled as a cylindrical body and the undesired EMI couplings are mathematically calculated and the results are then presented graphically. An algorithm is developed to predict the fundamental, third harmonic and fifth harmonic interference situations. The diffraction introduced by the curved nature of the cylindrical aircraft is considered. A few remedial measures are also suggested.