Modeling leakage through finite apertures with TLM

It is well known that the shielding effectiveness of a metal barrier is totally determined by any apertures cut in it. What is not completely clear from previous experimental and theoretical work is the relationship between the size of holes, their number, their shape, and the total shielding effectiveness as a function of frequency. The author derives empirical formulas for shielding effectiveness based on simulations of plane waves impinging on metal barriers with slots. He uses the 3-dimensional transmission line matrix method (TLM) along with absolute power flux transfer through the slot to compare various slot combinations. He also compares patterns and far field behavior using the method of equivalent magnetic currents.<
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