The recent emergence of electromagnetic (EM) metamaterial absorbers (MAs) with exceptionally high absorption rates has captured the interest of numerous researchers. This study introduces an innovative design for a dual-band microwave absorber, inspired by metamaterial concepts. A square ring resonator, a second ring resonator with splits at each of its four corners, and a third ring resonator created by joining two I-shaped pieces make up the unit cell, which has the dimensions . These resonators are realized on a metal-backed FR-4 substrate, a common dielectric material found in printed circuit boards. The primary objective of this absorber's configuration is to achieve remarkable absorption peaks at 1.55 GHz and 3.3 GHz, attaining absorption levels of 99.73% and 99.41%, respectively. Notably, the design is insensitive to polarization and exhibits a broad incidence angle of up to 60°. It maintains high absorption rates of 95% for the transverse electric mode and 94% for the transverse magnetic mode. In order to optimize the suggested design, parametric studies were carried out for unit cell design by varying the split gap, loss tangent, and various types of metal. The advanced design system (ADS) software was used to assess an equivalent circuit, and the results of the CST simulation were compared with the circuit, confirming good agreement. These attributes are well-suited for efficiently absorbing signals within specific frequency ranges, catering to the demands of applications such as Global Navigation Satellite Systems (GNSS) and the pioneering 5G frequency band. Simulation and measured results of the absorber closely align with the expected performance, affirming the efficacy of the design. In essence, this solution provides an effective means of absorbing electromagnetic waves in these defined frequency ranges, rendering it highly suitable for diverse wireless communication and navigation systems.

中文翻译：

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适用于 GNSS 和 5G 先锋频段的超材料吸收体：实现窄带宽、宽入射角和偏振不可知

最近出现的具有极高吸收率的电磁（EM）超材料吸收器（MA）引起了众多研究人员的兴趣。这项研究介绍了受超材料概念启发的双频段微波吸收器的创新设计。一个方形环形谐振器、一个在四个角上都有裂缝的第二个环形谐振器以及通过连接两个 I 形件创建的第三个环形谐振器组成了单位单元，其尺寸为 。这些谐振器在金属背衬 FR-4 基板上实现，这是印刷电路板中常见的介电材料。该吸收器配置的主要目标是在 1.55 GHz 和 3.3 GHz 处实现显着的吸收峰值，分别达到 99.73% 和 99.41% 的吸收水平。值得注意的是，该设计对偏振不敏感，并且具有高达 60° 的宽入射角。它对横向电模式保持 95% 的高吸收率，对横向磁模式保持 94% 的高吸收率。为了优化建议的设计，通过改变分裂间隙、损耗角正切和各种金属类型，对晶胞设计进行了参数研究。使用先进设计系统（ADS）软件评估等效电路，并将CST仿真的结果与电路进行比较，确认了良好的一致性。这些属性非常适合有效吸收特定频率范围内的信号，满足全球导航卫星系统 (GNSS) 和领先的 5G 频段等应用的需求。吸波器的仿真和测量结果与预期性能非常吻合，证实了设计的有效性。从本质上讲，该解决方案提供了一种吸收这些定义频率范围内的电磁波的有效方法，使其非常适合各种无线通信和导航系统。