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A physics investigation on impedance matching theory in microwave absorption film—Part I. Theory

Liu, Y. ORCID:, Drew, M. G. B. ORCID: and Liu, Y. ORCID: (2023) A physics investigation on impedance matching theory in microwave absorption film—Part I. Theory. Journal of Applied Physics, 134 (4). 045303. ISSN 1089-7550

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To link to this item DOI: 10.1063/5.0153608


The mechanism for microwave absorption in a film has previously been numerically verified from the theoretical formula for RL and attributed to angular and amplitude effects with a simple geometrical representation from energy conservation unique to the film. Starting from the case where |RL| = 0, using basic transmission-line theory and mathematics, it is confirmed theoretically here that the mechanism for absorption mechanism in a film, responsible for the minima of the reflection loss RL/dB, is best explained by wave cancelation theory rather than by impedance matching theory. This theoretical proof also reveals that the mechanisms for a film and material are different. The flaws of neglecting the phase effects of interfaces in a film in quarter-wavelength theory are also quantitatively discussed from transmission-line theory. Contrary to the theory held currently, the reported minima of RL/dB originate from phase effects in the film rather than from the resonance peaks for the intrinsic frequencies of a material.

Item Type:Article
Divisions:Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
ID Code:112858
Uncontrolled Keywords:General Physics and Astronomy
Publisher:AIP Publishing

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