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Application
The release of FEKO 5.2 introduces the possibility to compute field coupling into cables directly in FEKO for simple cabling scenarios without having to use additional tools. It is intended to provide the user a first approach of dealing with the problem of irradiation of cables excited by an external field, e.g. a plane wave, but also any other sources of radiation modelled in FEKO. Up to now only wires (i.e. simple wires without any shielding) could be modelled, but with the new technique "real" cables can be included in the simulation. This is achieved by relating the current on the cable's shield (caused by external radiation) to the voltage induced on the inner conductor by means of the cable's transfer impedance.

Technology
Cable coupling modelling technology is based on the application of Transmission Line Theory (TLT) with a resulting formulation able to compute the coupled-in voltage at the termination impedances of a cable close to a conducting metallic ground. The fields around the cable may be computed with the Method of Moments (MoM), Physical Optics (PO), Multilevel Fast Multipole Method (MLFMM) or the Finite Element Method (FEM) and does not take the cable into account when computing the field distribution. The cable therefore does not affect the field distribution at all. In this fact lies the reason for the greatly reduced number of unknowns in comparison to a full MoM solution: The cable itself is not modelled as a geometric entity and therefore not meshed into geometric segments, making it unnecessary to introduce a very fine mesh underneath the cable on the ground plane.

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•Application Note: Simple Cable Coupling Analyses In FEKO