Li Zhiming, Weng Xiaolong, Yi Xu, Li Kai, Duan Wei, Bi Mei
School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China.
School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu, 611731, China.
Sci Rep. 2024 May 27;14(1):12040. doi: 10.1038/s41598-024-62228-3.
This paper presents a frequency selective surface (FSS) with a wideband second-order bandpass response in the dual-band of microwave and millimeter wave. The overall structure consists of three layers of metal pattern and two layers of thin dielectric substrate. The top and bottom metal layers have capacitive patches with integrated curled Jerusalem cross slot resonators, while the intermediate metal layer has an inductive grid structure with cross-shaped slot resonators. The incorporated slot resonators play a pivotal role in achieving the desired transmission poles or zeros, which enable a wideband second-order filtering response in the dual-band and a quick roll-off at the passband edges, increasing the efficacy of electromagnetic shielding. To fully investigate the structure's frequency response, an equivalent circuit model of the structure is created, spanning the complete frequency range of 5-50 GHz. Physical samples are created and measured to confirm the suggested approach's efficacy. The passband center frequencies of the FSS are found at f = 19.42 GHz and f = 42.78 GHz, and the - 3 dB bandwidth is 4.34 GHz (17.25-21.59 GHz) and 8.54 GHz (38.51-47.05 GHz), respectively. The simulation results align well with the experimental data. The transmission response rapidly transitions from the passband to the stopband at the passband boundaries.
本文提出了一种在微波和毫米波双频段具有宽带二阶带通响应的频率选择表面（FSS）。整体结构由三层金属图案和两层薄介质基板组成。顶部和底部金属层具有集成卷曲耶路撒冷十字槽谐振器的电容贴片，而中间金属层具有带有十字形槽谐振器的电感栅格结构。所包含的槽谐振器在实现所需的传输极点或零点方面起着关键作用，这使得在双频段实现宽带二阶滤波响应，并在通带边缘实现快速滚降，提高了电磁屏蔽的效果。为了全面研究该结构的频率响应，创建了一个涵盖5 - 50 GHz完整频率范围的结构等效电路模型。制作并测量了物理样品，以确认所提方法的有效性。该FSS的通带中心频率分别为f = 19.42 GHz和f = 42.78 GHz，-3 dB带宽分别为4.34 GHz（17.25 - 21.59 GHz）和8.54 GHz（38.51 - 47.05 GHz）。仿真结果与实验数据吻合良好。在通带边界处，传输响应从通带迅速过渡到阻带。
