Clarification of basic concepts for electromagnetic interference shielding effectiveness

There exists serious miscomprehension in the open literature about electromagnetic interference shielding effectiveness (EMI SE) as a critical index to evaluate performance, which is misleading graduates and newcomers embarking on field of materials. EMI SE defined sum three terms including reflection loss, absorption loss multiple classical Schelkunoff theory, while it decomposed into two named practice, called Calculation theory here. In this paper, we elucidate widely-seen misconceptions connected with via theoretical derivation instance analysis. Firstly, are often mistakenly regarded approximation same names when negligible. Secondly, insufficient unreasonable determine absorption-dominant performance case that higher than since cannot represent actual levels reflected absorbed power. Power coefficients recommended compare contribution performance. Thirdly, effect included definitions reflections property clarified against commonly wrong understandings. These clarifications offer correct comprehension mechanism assessment total shielding.