Shielding Effectiveness of Materials Under the Excitation of High-Power Microwave

Abstract

Shielding effectiveness (SE) is one of the most important parameters of electromagnetic shielding materials. Accurate characterization and calculation of SE are crucial for the proper use of shielding materials. However, under the excitation of high-power microwave, the characterization of SE and evolution of the electromagnetic shielding property of shielding materials have not yet been concluded. In this article, we performed a systematic study on the SE of materials under the excitation of high-power microwave. The results show that the difference of SE obtained by the calculation of peak value reduction (SE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">PR</sub> ), energy reduction (SE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">WR</sub> ), and frequency-domain information (SE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">FD</sub> ) based on Fourier transform is negligible. The SE of materials can, therefore, be simply characterized by using peak value reduction. Moreover, the repetition frequency and pulsewidth are verified to have a negligible effect on the shielding performance of materials. However, with the increment of power density of high-power microwave, the SE of materials increases and finally becomes saturated.