Numerical modeling of EMI/EMC problems has become more popularover the past few years, due to the commercial availability of modelingsoftware and the drive to reduce product development cycle times. Thispaper introduces a technique for using applying numeric modeling toimmunity problems. Modeling can be used to simulate the effects ofradiated immunity as well as radiated emissions. Second, modelseliminate the `try-it-and-see' approach to immunity problems of guessingat the source of an immunity mechanism and experimentally trying manypossible solutions until an effective remedy is found. With modeling,solutions are not considered until the central mechanism of the problemis adequately understood. Once an adequate model is developed inspectionof the RF current flows at the frequencies of primary interest isparticularly instructive in this regard. Then using well knownelectromagnetic effects (such as reciprocity), modeling can be made muchsimpler, and effectively extend the usefulness of existing modelingtools
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