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A reflective-backing-free metamaterial absorber with broadband response

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Journal of Advanced Dielectrics 2017年第3期7卷 9-13页

作者： Cuilian Xu shaobo qu Jiafu Wang Mingbao Yan Yongqiang Pang Wenjie Wang Hua Ma Science College Air Force Engineering University Xi'an 710051P.R.China

In this paper,we propose a polarization-independent and broadband perfect infrared(IR)metamaterial absorber(MA)without reflective *** proposed absorber is a periodic meta-atom array consisting of metal-dielectric-multilayer truncated cones which can absorb 80%EM wave from 50.70 to 81.87 THz,while transmit 80%EM wave from 0 to 37.71 *** the decreasing of frequency,the transmissivity increases,which is close to 100%from 0 to 5 *** can broaden the absorption bandwidth of the MA by cascading multi-layers truncated ***,the proposed IR MA promises to be one desirable stealth material for radar-IR compatibility.

关键词： Metamaterial absorber reflective-backing-free infrared-radar stealth-compatible.

All-dielectric metamaterial frequency selective surface based on spatialarrangement ceramic resonators

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Journal of Advanced Dielectrics 2017年第2期7卷 13-16页

作者： Liyang Li Jun Wang Mingde Feng Hua Ma Jiafu Wang Hongliang Du shaobo qu Science College Air Force Engineering UniversityXi'an 710051 ShaanxiP.R.China

In this paper,we demonstrate a method of designing all-dielectric metamaterial frequency selective surface(FSS)with ceramic resonators in spatial *** with the traditional way,spatial arrangement provides a flexible way to handle the permutation and combination of different ceramic *** this method,the resonance response can be adjusted easily to achieve pass/stop band *** an example,a stop band spatial arrangement all-dielectric metamaterial FSS is *** working band is in 11.65–12.23 *** adjusting permittivity and geometrical parameters of ceramic resonators,we can easily modulate the resonances,band pass or band stop characteristic,as well as the working band.

关键词： All-dielectric metamaterial FSS ceramic resonators

All-dielectric metamaterial frequency selective surface

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Journal of Advanced Dielectrics 2017年第5期7卷 6-16页

作者： Jun Wang shaobo qu Liyang Li Jiafu Wang Mingde Feng Hua Ma Hongliang Du Zhuo Xu Science College Air Force Engineering University Xi'an 710051P.R.China Electronic Materials Research Laboratory Xi'an Jiaotong University Xi'an 710049P.R.China

Frequency selective surface(FSS)has been extensively studied due to its potential applications in radomes,antenna reflectors,high-impedance surfaces and ***,a new principle of designing FSS has been proposed and mainly studied in two *** the level of materials,dielectric materials instead of metallic patterns are capable of achieving more functional performance in FSS ***,FSSs made of dielectric materials can be used in different extreme environments,depending on their electrical,thermal or mechanical *** the level of design principle,the theory of metamaterial can be used to design FSS in a convenient and concise *** this review paper,we provide a brief summary about the recent progress in all-dielectric metamaterial frequency selective surface(ADM-FSS).The basic principle of designing ADM-FSS is *** significant tools,Mie theory and dielectric resonator(DR)theory are given which illustrate clearly how they are used in the FSS ***,several design cases including dielectric particle-based ADM-FSS and dielectric network-based ADM-FSS are introduced and *** a discussion of these two types of ADM-FSSs,we reviewed the existing fabrication techniques that are used in building the experiment ***,issues and challenges regarding the rapid fabrication techniques and further development aspects are discussed.

关键词： Frequency selective surface all-dielectric metamaterial dielectric materials Mie theory dielectric resonator theory

Completely spin-decoupled geometric phase of a metasurface

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Photonics Research 2023年第7期11卷 1162-1174页

作者： XINMIN FU JIE YANG JIAFU WANG YAJUAN HAN CHANG DING TIANSHUO QIU BINGYUE qu LEI LI YONGFENG LI shaobo qu Shaanxi Key Laboratory of Artificially-Structured Functional Materials and Devices Air Force Engineering UniversityXi’an 710051China School of Electronic and Information Engineering Xi’an Jiaotong UniversityXi’an 710049China

Metasurfaces have provided an unprecedented degree of freedom(DOF)in the manipulation of electromagnetic waves.A geometric phase can be readily obtained by rotating the meta-atoms of a ***,such geometric phases are usually spin-coupled,with the same magnitude but opposite signs for left-and right-handed circularly polarized(LCP and RCP)*** achieve independent control of LCP and RCP waves,it is crucial to obtain spin-decoupled geometric *** this paper,we propose to obtain completely spin-decoupled geometric phases by engineering the surface current paths on *** on the rotational Doppler effect,the rotation manner is first analyzed,and it is found that the generation of a geometric phase lies in the rotation of the surface current paths on *** the induced surface current paths under the LCP and RCP waves always start oppositely and are mirror-symmetrical with each other,it is natural that the geometric phases have the same magnitude and opposite signs when the meta-atoms are *** obtain spin-decoupled geometric phases,the induced surface current under one spin should be rotated by one angle while the current under the other spin is rotated by a different *** this way,LCP and RCP waves can acquire different geometric phase ***-of-principle prototypes were designed,fabricated,and *** the simulation and experiment results verify spin-decoupled geometric *** work provides a robust means to obtain a spindependent geometric phase and can be readily extended to higher frequency bands such as the terahertz,IR,and optical regimes.

关键词： geometric opposite surface

Leaky cavity modes in metasurfaces:a route to low-loss wideband anomalous dispersion

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Photonics Research 2023年第6期11卷 1085-1093页

作者： XIAOFENG WANG JIAFU WANG YAJUAN HAN MINGBAO YAN YONGFENG LI TONGHAO LIU HUA MA shaobo qu Shaanxi Key Laboratory of Artificially-Structured Functional Material and Devices Air Force Engineering UniversityXi’an 710051China

Metasurfaces have provided unprecedented degrees of freedom in manipulating electromagnetic waves upon *** this work,we first explore the condition of wide operating bandwidth in the view of reflective scheme,which indicates the necessity of anomalous *** this end,the leaky cavity modes(LCMs)in the metaatom are analyzed and can make effective permittivity inversely proportional to *** we employ the longitudinal Fabry-Perot(F-P)resonances and transverse plasmonic resonances to improve the LCMs *** is shown that the order of F-P resonance can be customized by the plasmonic modes,that is,the F-P cavity propagation phase should match the phase delay of surface currents excited on the *** nth order F-P resonance will multiply the permittivity by a factor of n,allowing larger phase accumulation with increasing frequencies and forming nonlinear phase distribution which can be applied in weak chromatic-aberration focusing *** a proof-of-concept,we demonstrate a planar weak chromatic-aberration focusing reflector with a thickness ofλ_(0)∕9 at 16.0-21.0 *** work paves a robust way to advanced functional materials with anomalous dispersion and can be extended to higher frequencies such as terahertz,infrared,and optical frequencies.

关键词： cavity anomalous dispersion

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综合物探技术在带压开采工作面中的应用

矿业安全与环保 2017年第5期44卷 81-85,92页

作者：屈少波中国矿业大学资源与地球科学学院江苏徐州221116 山西阳泉煤业(集团)有限责任公司五矿山西阳泉045209

阳泉煤业集团五矿8421工作面存在局部带压区,必须查清带压区隐伏灾害地质构造及其含水情况,为工作面安全回采提供保障。通过分析不同物探方法的特点和适用条件,采用无线电波透视法、矿井瞬变电磁法、并行直流电法3种物探方法,对该局部... 详细信息

阳泉煤业集团五矿8421工作面存在局部带压区,必须查清带压区隐伏灾害地质构造及其含水情况,为工作面安全回采提供保障。通过分析不同物探方法的特点和适用条件,采用无线电波透视法、矿井瞬变电磁法、并行直流电法3种物探方法,对该局部带压工作面进行了综合探测。多种地球物理探测方法相互印证和补充,并结合地质、水文地质条件分析,最终划分出3个底板相对富水区。经采掘验证,物探结果与实际情况相符。

关键词：综合物探带压开采富水区无线电波透视法矿井瞬变电磁法并行直流电法

基于质量数据融合及规则挖掘的离散制造过程监控方法

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计算机集成制造系统 2017年第9期23卷 1962-1971页

作者：璩晶磊李少波陈金坤中国科学院成都计算机应用研究所四川成都610041 贵州大学现代制造技术教育部重点实验室贵州贵阳550025 贵州大学计算机科学与技术学院贵州贵阳550025

为有效地从企业积累的制造过程质量数据中挖掘加工工序间的关联规则、实现制造过程的智能化监控,建立了基于质量数据融合和规则挖掘的离散制造过程监控模型。借鉴证据理论思想,提出一种基于模糊证据理论的多传感器质量数据融合算法,首... 详细信息

为有效地从企业积累的制造过程质量数据中挖掘加工工序间的关联规则、实现制造过程的智能化监控,建立了基于质量数据融合和规则挖掘的离散制造过程监控模型。借鉴证据理论思想,提出一种基于模糊证据理论的多传感器质量数据融合算法,首先将所有测量值构成的集合视为辨识框架,应用模糊数学原理引入隶属度函数,设计了多传感器之间互支持度计算的新方法,并借鉴信任分配思想将测量值转换为相应的证据,最终通过基于冲突分配的证据组合规则得到融合结果,实现制造过程质量数据的精确采集。设计了基于质量规则挖掘的离散制造过程分析方法,针对传统关联规则挖掘结果繁杂且有不符合实际加工顺序规则生成的情况,借鉴有监督学习思想,以实际工序顺序为约束,挖掘导致产品质量问题的关键因素,结合复杂事件处理技术对制造过程进行实时监控。通过实验结果验证了该监控方法的有效性和实用性。

关键词：关联规则,质量控制,数据融合,复杂事件处理离散制造过程监控模型

quasi-omnibearing retro-reflective metagrating protected by reciprocity

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Photonics Research 2022年第4期10卷 843-854页

作者： Yuxiang Jia Jiafu Wang Yajuan Han Ruichao Zhu Zhongtao Zhang Jie Yang Yueyu Meng Yongfeng Li shaobo qu Department of Basic Sciences Air Force Engineering UniversityXi’an 710051China Shaanxi Key Laboratory of Artificially-Structured Functional Materials and Devices Xi'an 710051China

Reciprocity is ubiquitous in antennas for receiving and radiating electromagnetic(EM) waves, i.e., if an antenna has good receiving performance at a given direction, it also has good radiation performance in that *** by this, we propose a method of designing a quasi-ominibearing retro-reflective metagrating(RRMG)protected by the reciprocity of antennas. Based on the second-order mode around 15.0 GHz of a short-circuited structured patch antenna(SPA), incident transverse magnetic waves can be received, channeled into the coaxial lines, reflected by the shortened end, and finally re-radiated into free space with a reversed wave vector. RRMGs are contrived consisting of this identical SPA, with a grating constant allowing ±2nd-, ±1st-, and zeroth-order diffractions. Oblique incidence, plus the tilted nulls of the re-radiation pattern, can eliminate -1st, zeroth,+1st, and +2nd orders, and only the -2nd order is left to achieve retro-reflections. Prototypes were fabricated and measured. Simulated and measured results show that the RRMGs maintain only -2nd-order diffraction for incident angles 32.2° ≤ θ_(i)quadrants, and that RRMGs can achieve quasi-omnibearing retro-reflections for θ_(i)= 50.0°. The use of higher-order diffraction brings more degrees of freedom in manipulating EM waves, and this strategy can be readily extended to millimeter waves, THz wave, or even optical regimes.

关键词： reflective antenna antennas

Miura origami based reconfigurable polarization converter for multifunctional control of electromagnetic waves

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Photonics Research 2024年第3期12卷 581-586页

作者： ZHIBIAO ZHU YONGFENG LI ZHE QIN LIXIN JIANG WENJIE WANG HONGYA CHEN JIAFU WANG YONGQIANG PANG shaobo qu Shaanxi Key Laboratory of Artificially-Structured Functional Materials and Devices Air Force Engineering UniversityXi’an 710051China School of Electronic Science and Engineering Xi’an Jiaotong UniversityXi’an 710049China

Polarization is one of the basic characteristics of electromagnetic(EM)waves,and its flexible control is very important in many practical *** present,most of the multifunction polarization metasurfaces are electrically tunable based on PIN and varactor diodes,which are easy to operate and have strong real-time ***,there are still some problems in them,such as few degrees of freedom of planar structure control,complex circuit,bulky sample,and high *** view of these shortcomings,this paper proposes a Miura origami based reconfigurable polarization conversion metasurface for multifunctional control of EM *** interaction between the electric dipoles is changed by adjusting the folding angleθ,thereby tuning the operating frequency of the polarization conversion and the polarization state of the reflected *** mechanical control method brings more degrees of freedom to manipulate EM *** the processed sample is with lightweight and low *** verify the performance of the proposed origami polarization converter,a Miura origami structure loaded with metal split rings is designed and *** operating frequency of the structure can be tuned in different folding *** addition,by controlling the folding angleθ,linear-to-linear and linear-to-circular polarization converters can be realized at different folding *** proposed Miura origami polarization conversion metasurface provides a new idea for reconfigurable linear polarization conversion and multifunctional devices.

关键词： polarization reconfigurable tuning