Articles
Human Exposure To RF And Microwave
February 17, 2010
•Application Note: Human Exposure To RF And Microwave
By EM Software & Systems - S.A. (Pty) Ltd.
There is a class of problems in the field of human exposure assessment to which the method of moments (MoM) is more suitable than the popular Finite Difference Time Domain (FDTD) technique. This include problems with large free space regions and / or curved metallic surfaces and wires. The advantages of an integral equation based technique such as the MoM is that the discretisation is done in terms of surfaces and not volumes, and therefore free space regions need not be discretised. The MoM is also more suitable to accrately model curved metallic surfaces and wires. No special boundary condition needs to be applied. The metallic sturctures are modelled as triangular patches and wires as line segments. The currents on these are calculated with the MoM sulutin.
For treatment of dielectric (lossy or lossless) objects the surface of multiple closed dielectric regions needs to be discretised, using again, triangular elements. Applying the Surface Equiqalence Principle (SEP), the equivalent electric and magnetic currents are calculated with the MoM. Metallic surfaces, wires and dielectric objects can be combined in one solution with these elements either inside, on the boundary, or external to any dielectric region.
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