Wave Mechanics of Microwave Absorption Films: Part 3 - Multilayered Films

Abstract

In the field of microwave absorption, the quarter-wavelength theory (QWM) is commonly employed for films with multiplelayers. However, this study demonstrates the inadequacy of QWM as it is fundamentally flawed. The conventional results pertaining to films with or without a metal backing are typically applied to the central layers of multilayer films. Nevertheless, this approach is flawed, as it overlooks the presence of incident microwaves on both sides of the central layer, focusing solely on those in front of the film. To address this gap, our work introduces a novel theoretical framework for multilayer films, filling the void in existing literature. This research introduces a new, robust physical approach to understanding Multilayered films.

The wave mechanics for microwave absorption film-Part 1: A short review

“…The fundamental formulae important to the subject are summarized in section 2.1 for convenience even they should be familiar to material researchers and a brief review of the conclusions already published is presented in section 2.2 to show that published data are not consistent with the mainstream theory. In Part 2 [28], it is proved quantitatively with convincing evidence that microwave absorption of film is not the same as the absorption from the attenuation power of material via optical path and in Part 3 the theory for multilayer film is developed [29].…”

“…The results show that |s 11 (x 1 -)| reaches it maxima when d ≈ nλ/2 instead of (2n + 1)λ/4 predicted by the QWM[11, 13, 19]. It shows that the QWM cannot be used to design multilayer film[29].…”