论文名称为“Wideband and Wide-Angle FSS using Loop Slotted Hybrid Quarter-Mode Substrate Integrated Cavity with Two Independently Controllable Poles”。针对基于基片集成波导（Substrate Integrated Waveguide, SIW）腔的频率选择表面（Frequency Selective Surface, FSS）带宽窄的问题，本文提出了一种基于四分之一模SIW（QMSIW）腔和环形缝隙复合结构的宽带宽角FSS。该周期单元由QMSIW腔以及两个环绕在腔周围位于腔体上下层的相同环形缝组成。两个谐振点和一个传输零点分别由QMSIW腔基模、缝隙模式以及二者耦合作用产生。该FSS通过精确调节双模配置，表现为宽传输通带和高传输效率等特性。此外，由于传输零点作用，工作通带右侧出现陡降特性。同样基于小型化单元，该FSS对大入射角度不敏感。得益于这种新颖的结构，一些靠近目标通带的高次模被抑制，使得两边寄生通带远离工作通带。为验证该设计的优势，本章对工作在中心频率10 GHz的该FSS完成了加工和测量。实验结果显示，在垂直入射情况下，相对1-/3-dB带宽为34%/49%，与仿真结果非常吻合，并且在60度入射下，相对3-dB带宽仍保持23%。工作主要完成人王洪斌、程钰间、陈志宁。

论文链接：https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=9107424

Abstract—A wideband and wide-angle frequency selective surface (FSS) is proposed in this work. The periodic element consists of a quarter-mode substrate integrated waveguide (QMSIW) cavity surrounded by two identical loop slots located on the top and bottom layers of the cavity. Two transmission poles and one transmission zero are caused by the fundamental mode in the QMSIW cavity, the slot mode and the coupling between them, respectively. By precisely tuning the dual-mode configuration, the proposed FSS shows a wide passband with a good transmission efficiency and a rapid roll-off at the high side of the operation band due to the transmission zero. With the QMSIW-based miniaturized elements, the FSS is also insensitive to a large angle of incidence. Thanks to the novel structure, several higher-order modes close to the target band are suppressed, making the parasitic passband far away from both sides of the designed band. To verify the advantages, a prototype operated at 10 GHz is fabricated and tested. The measured results show a wide passband performance with the 1-/3-dB relative bandwidths of 34%/49% for normal incidence, which agree well with the simulated results. Besides, the 3-dB bandwidth still remains 23% for the incident angle of 60°.

Index Terms—Frequency selective surface (FSS), quarter-mode substrate integrated waveguide (QMSIW), wideband, wide-angle.