Model based estimation of spectral components of EMI from antenna, transmitter and susceptibility of receiver

For the computation of the interference, evaluation of the transfer function of the channel from the source to the susceptor is required. For this, details of the signal spectrum of the source are needed. In case of a given device, a subsystem or the system its output spectrum is known apriori. However while carrying out the EMI analysis simple equations are available for computing the harmonics, the intermodulation and spurious outputs of the active devices be they be transmitter, receiver, oscillator or event the emissions from an antenna. These equations are good enough for the approximate results expected from manual computing. These are not adequate for a detailed analysis specifically with a data processing equipment. This paper brings out analysis and closed from solutions for modeling of the harmonics, the intermodulation components, and the spurious outputs from the active devices. The developed models can also be used for modeling the receiver transfer function over a wide range of frequencies covering the fundamental, sub-harmonics, harmonics and spurious.