# Ultra-Wideband and Wide-Angle Microwave Metamaterial Absorber

^{1}

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## Abstract

**:**

## 1. Introduction

_{0}is placed over a metal surface at a distance equal to a quarter of the wavelength. The major disadvantage of this resonant structure is its narrow bandwidth operation. The Jaumann absorber [2], consisting of several resistive layers spaced approximately by a quarter wavelength, operates over a wider bandwidth. However, this technique greatly increases the thickness of the structure. In 2002, Engheta proposed to introduce metamaterials in the design of absorbers [3]. This approach has represented a technological breakthrough, as it allows reducing drastically the thickness, but only for a narrow bandwidth. This kind of absorber can be realized with the use of a high impedance surface (HIS) associated with a resistive material.

## 2. Materials and Methods

_{Load}, and the performance of the antenna was highlighted by the calculation of its radar cross-section (RCS). This multilayered antenna was also composed with a bed of nails, in order to improve the RCS at lowest frequency in TM polarization and a double layer WAIM. In the present paper, related to the design of the absorber, as the constraints are different, some simplifications have been proposed. Indeed, the metasurface has become resistive, enabling suppression of the bed of nails, and keeping only one WAIM layer. In the TL model of the absorber, the impedance, Z

_{Load}, is a parameter used to improve the absorption level of the global structure.

_{Load}impedance. This model is represented by the quadrupole, Qp, in Figure 2. This TL model leads to negligible calculation times and, thus, allows optimization of a large number of simultaneous parameters. By simulating this circuit with ADS [24], we can also benefit from the performance of the associated optimizer.

_{r}= 4.7, tan δ = 0.02), RO4003 (woven glass reinforced hydrocarbon/ceramics, ε

_{r}= 3.38 and tan δ = 0.0027) from Rogers, MY360 (woven glass PTFE, ε

_{r}= 2.33 and tan δ = 0.0011) from Neltec and Diclad 880 (fiberglass-reinforced PTFE-based composites, ε

_{r}= 2.2 and tan δ = 0.0009) from Rogers. The checkerboard is constituted by metallic patches etched on RO4003 material, and connected at their corners with resistor foil NiCr (100 ohms per square) from Ticer Technologies. The metasurface is composed with the same resistor foil NiCr (100 ohms per square) etched on the second RO4003 material. All layers are finally connected together with a FASTRISE glue layer (ε

_{r}= 2.7).

## 3. Results

## 4. Discussion

## 5. Conclusions

## Author Contributions

## Funding

## Conflicts of Interest

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**Figure 1.**(

**a**) Multilayer absorber description (unit cell); (

**b**) Unit cell of the checkerboard with interconnected resistors.

**Figure 2.**Transmission line (TL) model of the absorber corresponding to Figure 1a.

**Figure 5.**Comparison between the simulated and measured magnitudes of the reflection coefficient (dB) as a function of frequency at normal incidence.

**Figure 6.**Comparison between the simulated and measured magnitudes of the reflection coefficient (dB) as a function of frequency with two angles of incidence 40° and 60° for TE polarization.

**Figure 7.**Comparison between the simulated and measured magnitudes of the reflection coefficient (dB) as a function of frequency with two angles of incidence 40° and 60° for TM polarization.

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**MDPI and ACS Style**

Begaud, X.; Lepage, A.C.; Varault, S.; Soiron, M.; Barka, A.
Ultra-Wideband and Wide-Angle Microwave Metamaterial Absorber. *Materials* **2018**, *11*, 2045.
https://doi.org/10.3390/ma11102045

**AMA Style**

Begaud X, Lepage AC, Varault S, Soiron M, Barka A.
Ultra-Wideband and Wide-Angle Microwave Metamaterial Absorber. *Materials*. 2018; 11(10):2045.
https://doi.org/10.3390/ma11102045

**Chicago/Turabian Style**

Begaud, Xavier, Anne Claire Lepage, Stefan Varault, Michel Soiron, and André Barka.
2018. "Ultra-Wideband and Wide-Angle Microwave Metamaterial Absorber" *Materials* 11, no. 10: 2045.
https://doi.org/10.3390/ma11102045