This article designs a miniaturized frequency selective absorber (FSR) based on X‐band. The FSR consists of a resistor sheet and a bandpass frequency selective surface (FSS). It has a wide low frequency absorption band and a low insertion loss wide high frequency transmission band. The resistor element is a hexagonal metal ring with lumped resistance. Each side of the ring is inserted with three cross metal branches. The branch is equivalent to the λ_h/4 short‐circuit branch. Three types of branches with different lengths can be used to achieve wide‐band transmission. The band‐pass FSS is a three‐layer structure, which is composed of two layers of circular metal patches and a layer of circular aperture. The band‐pass FSS must coincide with the transmission band of the resistor sheet. The resistor sheet is placed on the band‐pass FSS. At low frequencies, FSR functions as an absorber. The absorption bandwidth of 10 dB is 2.2 to 6.3 GHz. At high frequencies, the transmission band is almost transparent. At this time, the 1 dB transmission bandwidth is 8.1 to 12.1 GHz. FSR has good angular stability and polarization stability. A prototype of the structure was made and measured to verify the correctness of the design.

中文翻译：

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使用交叉带谐振器的具有X波段传输带的小型频率选择性吸收器

本文设计了一种基于X波段的小型化频率选择性吸收器（FSR）。FSR由一个电阻片和一个带通频率选择表面（FSS）组成。它具有宽的低频吸收带和低插入损耗的宽高频传输带。电阻器元件是具有集总电阻的六角形金属环。环的每一侧均插入三个交叉的金属分支。分支相当于λ _ħ/ 4短路分支。可以使用三种长度不同的分支来实现宽带传输。带通FSS是三层结构，由两层圆形金属贴片和一层圆形孔径组成。带通FSS必须与电阻片的传输带一致。电阻片放在带通FSS上。在低频时，FSR用作吸收器。10 dB的吸收带宽为2.2至6.3 GHz。在高频下，传输带几乎是透明的。此时，1 dB的传输带宽为8.1至12.1 GHz。FSR具有良好的角度稳定性和偏振稳定性。制作并测量了结构的原型，以验证设计的正确性。