Decomposition of radiating structures to directly predict asymmetric-mode radiation

This dissertation considers the effects that adding asymmetric elements to a symmetric transmission line have on the radiated emissions of that structure. It is shown that aymmetries in a radiating body create asymmetric currents which may be the dominant form of radiation. These asymmetric currents can be associated with common-mode or antenna-mode currents frequently discussed in the field of EMC (ElectroMagnetic Compatibility). A method is shown herein to decompose a structure into the union of symmetric and asymmetric models. This decomposition clearly illustrates the contributions of each component of the total model to the total radiated emissions of the structure. It also provides considerable insight into methods of reducing the radiated emissions of the structure. As a result of obtaining the asymmetric model, asymmetric currents can be easily approximated. The approximations also help to reduce computing time and memory size, enabling large complicated systems to be modeled.