In this paper, an ultra-thin microwave absorber with cross-resonator (CR) exhibiting a broad absorption bandwidth is designed and fabricated. Theoretical and experimental results show that the absorber has a wideband strong absorption in a frequency range from 2.2 to 6.8 GHz and from 2.2 to 5.4 GHz when incident electric field is y-and x-polarized, respectively. The equivalent L–C circuit and energy loss density clarify the mechanism underlying observed absorption. Moreover, the oblique incidence performance of the proposed absorber is also analyzed and shows that the broad bandwidth can be maintained as incident angle increases up to 30 degrees for y-polarized wave and 60 degrees for x-polarized wave, respectively. And when incident angle is fixed at 30 degrees the absorption bandwidth can be achieved from 2.1 to 7.5 GHz with azimuth angle of 90 degrees for x-polarized wave.

中文翻译：

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跨越 S 和 C 波段的宽带磁性聚合物复合吸收体的演示

在本文中，设计和制造了具有宽吸收带宽的具有交叉谐振器 (CR) 的超薄微波吸收器。理论和实验结果表明，当入射电场分别为 y 和 x 极化时，吸收体在 2.2 至 6.8 GHz 和 2.2 至 5.4 GHz 的频率范围内具有宽带强吸收。等效 L-C 电路和能量损失密度阐明了观察到的吸收的潜在机制。此外，还分析了所提出的吸收器的斜入射性能，并表明随着入射角对于 y 偏振波分别增加到 30 度和对于 x 偏振波增加到 60 度，可以保持宽带宽。当入射角固定在 30 度时，吸收带宽可以达到 2.1 到 7。