A novel and simple six-band metamaterial absorber is proposed in the terahertz region, which is composed of an I-shaped absorber and circular ring with four gaps and a continuous metal ground plane separated by only 0.125 mm polyimide dielectric substrate. Initially, I-shaped resonator gives three bands at 0.4, 0.468 and 0.4928 THz with the absorptivity of 99.3%, 97.9% and 99.1%, respectively. The purpose of this paper is to improve the number of bands, for which the authors added the circular ring with four gaps, so the simulated metamaterial absorber exhibited six absorption peaks at 0.3392, 0.3528, 0.3968, 0.4676, 0.4768 and 0.492 THz, with the absorption rate of 91.4%, 94.2%, 94.9%, 90.3%, 77.5% and 97.4%, respectively. The surface current distribution and angle independence are explained for all the six frequencies which are used to analyze the absorption mechanism clearly. Structure maximum uses the squares and circles, so it will make the fabrication easy. The multiband absorbers obtained here have potential applications in many engineering technology, thermal radiation, material detection and imaging and optoelectronic areas.,This paper presents the design of the six-band metamaterial absorber which is from the I-shaped resonator and circular ring with four gaps and the metallic ground plane separated by the 0.125 polyimide dielectric substrate. The absorber exhibited six absorption peaks at 0.3392, 0.3528, 0.3968, 0.4676, 0.4768 and 0.492 THz, with the absorption rate of 91.4%, 94.2%, 94.9%, 90.3%, 77.5% and 97.4%, respectively. From the fabrication point of view, the proposed six-band metamaterial absorber has a very simple geometrical structure, and it is very easy to be fabricated.,The authors present a new and simple design of six-band absorber based on an I-shaped absorber and circular ring with four gaps and a metallic ground plane separated by a polyimide layer having the thickness of 0.125 mm. Six different resonance absorption peaks are found at 0.3392, 0.3528, 0.3968, 0.4676 , 0.4768 and 0.492 THz. Surface current distribution and angle independence plot have been studied to understand the absorption behavior of the designed terahertz metamaterial absorber.,The multiband absorbers obtained here have potential applications in many engineering technology, thermal radiation, material detection, security, sensors, imaging and optoelectronic areas.

中文翻译：

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改进的 I 形六波段近完美太赫兹超材料吸收器

在太赫兹区域提出了一种新颖且简单的六波段超材料吸收器，它由一个 I 形吸收器和具有四个间隙的圆环和一个仅由 0.125 mm 聚酰亚胺介电基板隔开的连续金属接地平面组成。最初，I 形谐振器提供 0.4、0.468 和 0.4928 THz 三个频段，吸收率分别为 99.3%、97.9% 和 99.1%。本文的目的是为了增加波段数，为此作者添加了四个间隙的圆环，因此模拟的超材料吸收体在 0.3392、0.3528、0.3968、0.4676、0.4768 和 0.492 THz 处表现出六个吸收峰，其中吸收率分别为 91.4%、94.2%、94.9%、90.3%、77.5% 和 97.4%。解释了所有六个频率的表面电流分布和角度无关性，用于清楚地分析吸收机制。结构最大使用正方形和圆形，因此它会使制造变得容易。在此获得的多波段吸收体在许多工程技术、热辐射、材料检测和成像以及光电领域都有潜在的应用。,本文介绍了由 I 形谐振腔和带有四个圆环的六波段超材料吸收体的设计。间隙和金属接地平面由 0.125 聚酰亚胺介电基板隔开。吸收体在0.3392、0.3528、0.3968、0.4676、0.4768和0.492 THz处出现6个吸收峰，吸收率分别为91.4%、94.2%、94.9%、90.3%、77.5%。从制造的角度来看，所提出的六波段超材料吸波器具有非常简单的几何结构，并且非常容易制造。,作者提出了一种基于 I 形的新的简单设计的六波段吸波器吸收器和具有四个间隙的圆环和由厚度为 0.125 毫米的聚酰亚胺层分隔的金属接地平面。在 0.3392、0.3528、0.3968、0.4676、0.4768 和 0.492 THz 处发现了六个不同的共振吸收峰。研究了表面电流分布和角度独立图以了解设计的太赫兹超材料吸收器的吸收行为。,此处获得的多波段吸收器在许多工程技术、热辐射、材料检测、安全、传感器、成像和光电领域具有潜在应用. 所提出的六波段超材料吸波器具有非常简单的几何结构，并且非常容易制造。,作者提出了一种基于 I 形吸波器和具有四个间隙的圆环的六波段吸波器的新设计。以及由厚度为0.125mm的聚酰亚胺层隔开的金属地平面。在 0.3392、0.3528、0.3968、0.4676、0.4768 和 0.492 THz 处发现了六个不同的共振吸收峰。研究了表面电流分布和角度独立图以了解设计的太赫兹超材料吸收器的吸收行为。,此处获得的多波段吸收器在许多工程技术、热辐射、材料检测、安全、传感器、成像和光电领域具有潜在应用. 所提出的六波段超材料吸波器具有非常简单的几何结构，并且非常容易制造。,作者提出了一种基于 I 形吸波器和带有四个间隙的圆环的六波段吸波器的新设计。以及由厚度为0.125mm的聚酰亚胺层隔开的金属地平面。在 0.3392、0.3528、0.3968、0.4676、0.4768 和 0.492 THz 处发现了六个不同的共振吸收峰。研究了表面电流分布和角度独立图以了解设计的太赫兹超材料吸收器的吸收行为。,此处获得的多波段吸收器在许多工程技术、热辐射、材料检测、安全、传感器、成像和光电领域具有潜在应用.