| 摘要: |
| 针对宽带天线的隐身问题，提出了一种基于圆环交指结构的新型频率选择吸波体（Frequency Selective Rasorber，FSR）的设计方案。所设计的两个FSR的阻抗层相同，由圆环交指谐振结构与耶路撒冷十字金属线组成，并加载电阻。FSR1的无损带通层由金属缝隙方环构成，FSR2的带通层由金属贴片-金属孔径-金属贴片三层结构组成。仿真结果显示，两种FSR均具有双极化性质，并且FSR1角度稳定性可达45°，FSR2为35°。FSR2在垂直电磁波入射条件下，在2.52~10.07 GHz的反射系数低于-10 dB，在5.73~6.93 GHz的透射系数高于-3 dB，其中在6.29 GHz，透波窗口的最小插入损耗为-0.11 dB。FSR2在几乎相同的频带保持反射系数低于-10 dB，但是其透波带被拓展为5.6~7.2 GHz，同时透波带的矩形系数得到很大提升，具有更好的选择性。模型仿真结果与等效电路模型仿真结果基本一致。最终制作了两个FSR的实物模型，实验测试结果与仿真保持基本一致。 |
| 关键词: 频率选择吸波体 角度稳定性 高选择性宽通带 圆环交指谐振结构 |
| DOI：10.20079/j.issn.1001-893x.240801001 |
|
| 基金项目:军科委基础加强计划项目（2022-JCJQ-JJ-0230） |
|
| Design of a Novel Frequency Selective Rasorber Based on Circular Interdigital Resonant Structure |
| XU Yixuan,WU Weiwei,SHI Tongtong,YAN Yuchen,YAN Xiao |
| (State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and InformationSystem,National University of Defense Technology,Changsha 410005,China) |
| Abstract: |
| For the stealth issue of current broadband antennas,a novel design of a frequency selective rasorber (FSR) based on circular interdigital resonant structure is proposed.Both FSRs have the same lossy layer,composed of the circular interdigital resonant structure and Jerusalem cross metal lines,with resistors loaded.FSR1 lossless bandpass layer is made up of metal slit square rings,while the FSR2’s bandpass layer consists of a three-layer structure of metal patch-aperture-patch.Both types of FSRs have dual-polarization properties.FSR1 maintains a reflection coefficient below -10 dB from 2.52 GHz to 10.07 GHz under perpendicular electromagnetic wave incidence,with FSR1 achieving an angular stability of up to 45° and FSR2 up to 35°.The transmission coefficient is above -3 dB between 5.73 GHz and 6.93 GHz,with the minimum insertion loss at the transmission window being -0.11 dB at 6.29 GHz.FSR2 also maintains a reflection coefficient below -10 dB in nearly the same frequency band,but its passband extends from 5.6 GHz to 7.2 GHz,with significantly improved rectangularity coefficient in the passband,indicating better selectivity.The model simulation results are essentially consistent with the equivalent circuit model(ECM) simulation results.Eventually,physical models of both FSRs are produced,and the experimental test results are basically consistent with the simulations. |
| Key words: frequency selective rasorber angle-stable highly selective wide passband circular interdigital resonant structure |
