Impedance-Matched Iron-Added Polymeric Composite Film Incorporated with Iron Nanowire for Electromagnetic Absorption Application
Yuh-Jing Chiou, Pei-Jung Chang, Pei-Ru Su, Sheng-Jung Tsou, Chung-Kwei Lin
TL;DR
This paper presents a new composite film with iron and iron nanowires for improving microwave absorption in radar applications.
Contribution
A novel impedance-matched polymeric composite film with iron nanowires for enhanced electromagnetic absorption is developed.
Findings
A 4:1 iron-PVA composite film showed a sheet resistance of 49 ± 9.7 Ω/sq with good iron dispersion.
Adding 1 wt.% Fe nanowires resulted in a 329.7 ± 45.3 Ω/sq sheet resistance and an impedance matching degree of 0.88 ± 0.12.
The composite film is suitable as a resistance sheet for Salisbury screen-type absorbers in RAS applications.
Abstract
Salisbury screen-type radar absorption structures (RASs) consisting of a resistance sheet, a spacer, and a conductive base provide an efficient method for microwave absorption. An impedance-matched resistance sheet allows microwaves to enter, whereas superior microwave absorbers enhance their performance further. In the present work, an impedance matching composite film was prepared by using polymer/iron/iron nanowires. By varying the polymer, poly (methyl methacrylate) (PMMA), poly (vinylidene fluoride) (PVDF), and poly (vinyl alcohol) (PVA), to iron powder ratios (1:1, 2:1, and 4:1), composite films were synthesized and examined by scanning electron microscopy, X-ray diffraction, and the four-point probe method to determine the materials’ characteristics. An impedance-matched composite film was prepared based on the selected composition with 1–10 wt.% iron nanowire additions.…
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Taxonomy
TopicsElectromagnetic wave absorption materials · Advanced Antenna and Metasurface Technologies · Metamaterials and Metasurfaces Applications