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http://dx.doi.org/10.26866/jees.2019.19.2.71

Design of Wideband Microwave Absorbers Using Reactive Salisbury Screens with Maximum Flat Reflection  

Kim, Gunyoung (Department of Electronics Engineering, Kyung Hee University)
Kim, Sanghoek (Department of Electronics Engineering, Kyung Hee University)
Lee, Bomson (Department of Electronics Engineering, Kyung Hee University)
Publication Information
Journal of electromagnetic engineering and science / v.19, no.2, 2019 , pp. 71-81 More about this Journal
Abstract
This paper presents a design methodology for wideband single-layered microwave absorbers with arbitrary absorption at the design center frequency using reactive Salisbury screens. The bandwidth of the absorber increases when the flatness of the reflection response at the design center frequency is maximized. Based on this observation, closed-form design formulas for wideband absorbers are derived. As they are scalable to any design frequency, wideband reactive screens can be systematically realized using two-dimensional periodic crossed-dipole structures patterned on a resistive sheet. Based on this method, a single-layered absorber with a 90% bandwidth improved to 124% of the design center frequency is presented. For the purpose of physical demonstration, an absorber with a design center frequency of 10 GHz is designed and fabricated using a silver nanowire resistive film with a surface resistance of 30 Ω/square. The measured absorption shows a good agreement with both the calculation and the electromagnetic simulation.
Keywords
Absorption Bandwidth; Design Equation; Microwave Absorber; Maximum Flatness; Reactive Salisbury Screen;
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