A compact wideband metamaterial absorber for Ku band applications
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A compact wideband metamaterial absorber for Ku band applications Chetan Barde1 · Arvind Choubey2 · Rashmi Sinha1 · Santosh Kumar Mahto3 · Prakash Ranjan2 Received: 1 April 2020 / Accepted: 12 August 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract A compact wideband metamaterial absorber (MA) for Ku band applications is presented in this paper. Ku band is a part of a microwave frequency spectrum ranging from 12 to 18 GHz. The proposed MA absorbs incident wave from 11.39 to 20.15 GHz with a bandwidth of 8.76 GHz which fully covers the Ku band. The proposed structure is compact having an overall dimension of 10 mm × 10 mm. The structure is fabricated on theFR4 substrate and the simulated result is carried using ANSYS HFSS 19.1. The absorption mechanism is illustrated by calculating effective electro magnetic (EM) parameters ( 𝜖eff & 𝜇eff ). Current distribution is also plotted in support of absorption mechanism. The structure is also examined at different angles ( 00–900 ) for the oblique and normal incident. The proposed MA is tested inside the Anechoic Chamber and it was found that simulated and measured result is close to each other with variation within the tolerance limit. At last comparison of the proposed MA is done with already reported MA. MA presented in this paper finds applications for satellite communication radar surveillance and other defense applications.
1 Introduction Metamaterial consists of an artificial periodic structure having EM properties commonly not found in nature occurring periodic structures [1]. Due to these extraordinary properties, metamaterial supports backward waves [2], inverse Snell’s law [3], negative index of refraction [4], etc. Considering the above unique EM properties, many metamaterial devices are gaining their impact over the conventional devices such as cloaking [5], superlens [6], metamaterial antenna [7], resonators [8], sensors [9], metamaterial absorbers [10], and so on. MA is one of the promising applications of artificial periodic structure (metamaterial) [11]. Hence, MA is replacing conventional absorber for radar cross section reduction, cavity resonance reduction, near field absorbers, reflection reduction, anechoic Chamber, thermal emitters, microwave Imaging, spectroscopic detection, phase
* Chetan Barde [email protected] 1
National Institute of Technology Jamshedpur, Jamshedpur, India
2
Indian Institute of Information Technology Bhagalpur, Bhagalpur, India
3
Indian Institute of Information Technology Ranchi, Ranchi, India
imaging of hazardous material, and solar energy harvesting, etc [12–15]. MA has been designed for various frequencies and is reported but they have absorption phenomenon for a particular frequency. To obtain resonance conditions for wide frequency wideband, MA is reported which are based on multilayer [16], multi resonant [17], and single layers [14]. Multilayer and multi resonant suffer from the thickness and large size. Single-layer wideband MA overcome all the above-mentioned
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