CN118099751A - A broadband multifunctional reconfigurable electromagnetic metasurface - Google Patents
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- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
- H01Q15/002—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective said selective devices being reconfigurable or tunable, e.g. using switches or diodes
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- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
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Abstract
Description
技术领域Technical Field
本发明属于电磁超材料技术领域，特别是一种宽频带多功能可重构电磁超表面。The present invention belongs to the technical field of electromagnetic metamaterials, and in particular to a broadband multifunctional reconfigurable electromagnetic metasurface.
背景技术Background technique
针对电磁超表面在电子侦察、无线通信、对抗干扰、空域隐身等场景下的功能应用，为实现电磁波在频域、空域、极化域、能量域的精细控制，提高独立设备性能和多装备综合工作能力，对电磁超表面提出了高集成、超宽带、低剖面、多功能等新的设计需求。传统超表面具有吸波、极化扭转、透波等独立功能，这类超表面工作带宽虽然较宽，但功能单一，集成度低，难以满足多功能与可重构设计需求。In view of the functional applications of electromagnetic metasurfaces in electronic reconnaissance, wireless communication, anti-interference, airspace stealth and other scenarios, in order to achieve fine control of electromagnetic waves in the frequency domain, airspace, polarization domain and energy domain, and improve the performance of independent equipment and the comprehensive working ability of multiple equipment, new design requirements such as high integration, ultra-wideband, low profile and multi-function are proposed for electromagnetic metasurfaces. Traditional metasurfaces have independent functions such as wave absorption, polarization twisting and wave transmission. Although the working bandwidth of such metasurfaces is relatively wide, they have single functions and low integration, making it difficult to meet the requirements of multi-function and reconfigurable design.
随着空间电磁环境的日益复杂以及实际工程应用的多样需求，具有多功能特性的电磁超表面以及超表面与天线相结合从而提升天线性能的研究具有十分重要的现实意义。尤其是有源超表面，通过加载外界激励的方式来改变工作频率或传输、反射特性，从而实现对电磁波的灵活调控，可以应用于天线的可重构设计中。另一方面，可重构超表面由于既能在特定频率接收或传输信号，又能够在一定的频段吸收或反射任何方向的来波而受到广泛关注。With the increasing complexity of the electromagnetic environment in space and the diverse needs of practical engineering applications, the research on electromagnetic metasurfaces with multifunctional characteristics and the combination of metasurfaces and antennas to improve antenna performance has very important practical significance. In particular, active metasurfaces can change the operating frequency or transmission and reflection characteristics by loading external excitations, thereby realizing flexible control of electromagnetic waves, which can be applied to the reconfigurable design of antennas. On the other hand, reconfigurable metasurfaces have attracted widespread attention because they can receive or transmit signals at specific frequencies and absorb or reflect incoming waves from any direction in a certain frequency band.
发明内容Summary of the invention
本发明的目的在于提供一种具有多种功能，实现对电磁波精细调控的宽频带多功能可重构电磁超表面，其能够采用印刷电路技术进行批量生产，而且具有体积小、性能稳定、制作成本低的优点。The purpose of the present invention is to provide a broadband multifunctional reconfigurable electromagnetic metasurface with multiple functions for achieving fine control of electromagnetic waves. The surface can be mass-produced using printed circuit technology and has the advantages of small size, stable performance and low production cost.
实现本发明目的的技术解决方案为：一种宽频带多功能可重构电磁超表面，包括上层极化扭转层、中层电阻损耗层以及下层可重构频率选择表面层；The technical solution to achieve the purpose of the present invention is: a broadband multifunctional reconfigurable electromagnetic metasurface, comprising an upper polarization twisting layer, a middle resistive loss layer, and a lower reconfigurable frequency selective surface layer;
所述极化扭转层上加载了中心对称的箭头型金属贴片，其为中心对称，分布于表层对角边缘处；所述电阻损耗层正面为八个封装电阻和正方形金属条带，封装电阻位于电阻损耗层正面四周边缘处，通过金属条带连接，反面为四个螺旋电感，位于电阻损耗层每条边中央，通过金属过孔连接；所述可重构频率选择表面由上到下分为五层，依次为：渐变梯形金属贴片与PIN二极管、介质基板、条带性金属贴片、介质基板、方形金属贴片，其中PIN二极管位于可重构频率选择表面正中央，连接两个渐变梯形金属贴片，二者通过PCB工艺焊接，条带性金属贴片、方形金属贴片印刷在介质基板上，五层结构通过PCB工艺压合而成。The polarization twisting layer is loaded with centrally symmetrical arrow-shaped metal patches, which are centrally symmetrical and distributed at the diagonal edges of the surface layer; the front side of the resistance loss layer is composed of eight packaged resistors and square metal strips, the packaged resistors are located at the edges of the front side of the resistance loss layer and are connected by metal strips, and the back side is composed of four spiral inductors, which are located in the center of each side of the resistance loss layer and are connected by metal vias; the reconfigurable frequency selective surface is divided into five layers from top to bottom, namely: gradient trapezoidal metal patches and PIN diodes, dielectric substrates, strip metal patches, dielectric substrates, and square metal patches, wherein the PIN diode is located in the center of the reconfigurable frequency selective surface and is connected to two gradient trapezoidal metal patches, which are welded by PCB technology, and the strip metal patches and square metal patches are printed on the dielectric substrate, and the five-layer structure is laminated by PCB technology.
进一步的，所述极化扭转层板材采用单层0.127mm厚的Rogers RT/duroid5880，介电常数为2.2的微波基片和金属铜构成。Furthermore, the polarization twisted layer plate material is composed of a single layer of 0.127 mm thick Rogers RT/duroid5880, a microwave substrate with a dielectric constant of 2.2, and metal copper.
进一步的，所述电阻损耗层由0402封装电阻、1.57mm厚的Rogers RT/duroid5880，介电常数为2.2的微波基片以及金属铜构成。Furthermore, the resistance loss layer is composed of a 0402 package resistor, a 1.57 mm thick Rogers RT/duroid5880, a microwave substrate with a dielectric constant of 2.2, and metal copper.
进一步的，所述可重构频率选择表面由SMP1345-040LF型号PIN二极管、FR-4_epoxy，介电常数为4.4的微波基片以及金属铜构成。Furthermore, the reconfigurable frequency selective surface is composed of a SMP1345-040LF model PIN diode, FR-4_epoxy, a microwave substrate with a dielectric constant of 4.4, and metal copper.
进一步的，所有金属贴片的材料为金属铜。Furthermore, the material of all metal patches is copper.
本发明与现有技术相比，其显著优点为：(1)现有超表面多功能设计多局限于2-3种，且有源可调电子器件的引入进一步限制了超表面结构的宽带性能，且多功能设计多采用多层级联设计，进而带来剖面高度的增加。本设计中的超表面创新性的仅利用3层结构实现了吸波、透波、极化扭转、反射、频选、增透、漫散射等7种功能的设计，且各功能带宽均满足20％以上的要求。(2)有源可调器件的引入会加大超表面单元层间插损，而插损会进一步影响超表面结构透波系数、影响功能间的融合。本设计的多层超表面结构插损仅有0.245dB，且3dB插损带宽达40％，有效提升透射性能。(3)相比现有多功能超表面，本设计的超表面还具备组阵之后的漫散射功能，可利用原有结构中的吸波、极化扭转与漫散射功能进行低漫散射融合协同设计，并能够服务于新一代电磁频谱战中的地面战车、舰载、机载超宽带阵列雷达中，提升宽带紧耦合阵列的宽频宽空域低散射隐身性能。Compared with the prior art, the present invention has the following significant advantages: (1) The existing metasurface multifunctional designs are mostly limited to 2-3 types, and the introduction of active adjustable electronic devices further limits the broadband performance of the metasurface structure, and the multifunctional design mostly adopts a multi-layer cascade design, which leads to an increase in the profile height. The metasurface in this design innovatively uses only 3 layers of structure to achieve the design of 7 functions such as wave absorption, wave transmission, polarization twisting, reflection, frequency selection, anti-reflection, and diffuse scattering, and the bandwidth of each function meets the requirement of more than 20%. (2) The introduction of active adjustable devices will increase the insertion loss between the metasurface unit layers, and the insertion loss will further affect the wave transmission coefficient of the metasurface structure and affect the integration of functions. The multi-layer metasurface structure of this design has an insertion loss of only 0.245dB, and the 3dB insertion loss bandwidth is 40%, which effectively improves the transmission performance. (3) Compared with the existing multifunctional metasurfaces, the metasurface of this design also has the diffuse scattering function after array formation. It can use the wave absorption, polarization twisting and diffuse scattering functions in the original structure to perform low diffuse scattering fusion collaborative design, and can serve in the new generation of ground combat vehicles, ship-borne, and airborne ultra-wideband array radars in electromagnetic spectrum warfare, improving the wide-band and wide-spatial low-scattering stealth performance of the broadband tightly coupled array.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
下面结合附图及具体实施例对本发明作进一步详细描述。The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.
图1是本发明多功能可重构电磁超表面单元的整体结构图。FIG1 is an overall structural diagram of a multifunctional reconfigurable electromagnetic metasurface unit of the present invention.
图2是本发明多功能可重构电磁超表面单元的极化扭转层示意图。FIG2 is a schematic diagram of the polarization twisting layer of the multifunctional reconfigurable electromagnetic metasurface unit of the present invention.
图3是本发明多功能可重构电磁超表面单元的电阻损耗层示意图。FIG3 is a schematic diagram of the resistance loss layer of the multifunctional reconfigurable electromagnetic metasurface unit of the present invention.
图4是本发明多功能可重构电磁超表面单元的可重构频率选择层示意图。FIG4 is a schematic diagram of a reconfigurable frequency selection layer of a multifunctional reconfigurable electromagnetic metasurface unit of the present invention.
图5是本发明多功能可重构电磁超表面单元在PIN二极管OFF状态下的S参数。FIG5 is an S parameter of the multifunctional reconfigurable electromagnetic metasurface unit of the present invention when the PIN diode is in the OFF state.
图6是本发明多功能可重构电磁超表面单元在PIN二极管ON状态下的S参数。FIG6 is an S parameter of the multifunctional reconfigurable electromagnetic metasurface unit of the present invention when the PIN diode is in the ON state.
图7是本发明多功能可重构电磁超表面单元在在单极化入射波下的反射Rxx和反射Ryx结果图。FIG7 is a graph showing the reflection Rxx and reflection Ryx results of the multifunctional reconfigurable electromagnetic metasurface unit of the present invention under a single-polarized incident wave.
图8是本发明多功能可重构电磁超表面“0”单元和“1”单元之间相位实际值与差值结果图。FIG8 is a diagram showing the actual phase value and difference between the “0” unit and the “1” unit of the multifunctional reconfigurable electromagnetic metasurface of the present invention.
图9是本发明多功能可重构电磁超表面“0”单元和“1”单元各自组成5×5的子阵，子阵组成棋盘式排布的超表面阵列示意图。9 is a schematic diagram of a metasurface array in which the multifunctional reconfigurable electromagnetic metasurface "0" units and "1" units of the present invention each form a 5×5 sub-array, and the sub-arrays form a checkerboard arrangement.
图10是本发明多功能可重构电磁超表面阵列在TE/TM极化下与等口径金属地板RCS对比结果图。FIG10 is a graph showing the RCS comparison results of the multifunctional reconfigurable electromagnetic metasurface array of the present invention under TE/TM polarization and a metal floor of equal aperture.
图11是本发明多功能可重构电磁超表面阵列ON状态下不同入射角度下双站RCS缩减曲线图。FIG11 is a graph showing a bistatic RCS reduction curve at different incident angles when the multifunctional reconfigurable electromagnetic metasurface array of the present invention is in the ON state.
图12是本发明多功能可重构电磁超表面阵列加工样机实物图。FIG12 is a physical picture of the multifunctional reconfigurable electromagnetic metasurface array processing prototype of the present invention.
具体实施方式Detailed ways
下面结合附图及实施例对本发明进行作进一步说明。The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
结合图1，本发明提出一种兼具吸波、透波、反射、漫散射等多种功能的一种超宽带可重构多功能电磁超表面，如图1所示，整体结构分为三层，包括上层极化扭转层1、中层电阻损耗层2以及下层可重构频率选择表面层3。In conjunction with Figure 1, the present invention proposes an ultra-wideband reconfigurable multifunctional electromagnetic metasurface that has multiple functions such as wave absorption, wave transmission, reflection, and diffuse scattering. As shown in Figure 1, the overall structure is divided into three layers, including an upper polarization twisting layer 1, a middle resistance loss layer 2, and a lower reconfigurable frequency selective surface layer 3.
所述极化扭转层1上加载了中心对称的“箭头”型金属贴片4；所述电阻损耗层2正面为八个0402封装电阻5和正方形金属条带6，反面为四个螺旋电感7；所述可重构频率选择表面3由上到下分为五层，依次为：渐变梯形金属贴片8与PIN二极管9、介质基板、条带性金属贴片10、介质基板、方形金属贴片11。五层结构通过PCB工艺压合而成。The polarization twist layer 1 is loaded with a centrally symmetrical "arrow"-shaped metal patch 4; the resistance loss layer 2 has eight 0402 package resistors 5 and a square metal strip 6 on the front, and four spiral inductors 7 on the back; the reconfigurable frequency selective surface 3 is divided into five layers from top to bottom, which are: a gradient trapezoidal metal patch 8 and a PIN diode 9, a dielectric substrate, a strip metal patch 10, a dielectric substrate, and a square metal patch 11. The five-layer structure is laminated by PCB technology.
所述损耗层在传统方环结构的基础上加载螺旋电感和电阻，实现中频段40％的宽阻带，且低频段吸波相对带宽从88％扩展到112％。为有效利用中频段产生的宽阻带，引入更多功能的设计，将损耗层下层的金属地板移除，引入新的一层可重构渐变梯形频率选择表面，通过PIN管的开关控制实现中频段透射和反射功能的快速切换。调整层间高度，在兼顾ON状态下低频段吸波和中频段反射性能的同时，实现OFF状态下低频段高吸波率带宽的优化和高频段宽阻带的构建。利用高频段构建的宽阻带，引入极化扭转层，实现22％带宽极化转换的功能。单元大小为30*30mm2，整体厚度为42.35mm(0.133λL，λL为工作频段最低频对应的波长)。The loss layer is loaded with spiral inductors and resistors on the basis of the traditional square ring structure to achieve a wide stopband of 40% in the mid-frequency band, and the relative bandwidth of low-frequency absorption is extended from 88% to 112%. In order to effectively utilize the wide stopband generated in the mid-frequency band, a design with more functions is introduced. The metal floor under the loss layer is removed, and a new layer of reconfigurable gradient trapezoidal frequency selective surface is introduced. The fast switching of the transmission and reflection functions in the mid-frequency band is realized through the switch control of the PIN tube. The interlayer height is adjusted to optimize the bandwidth of the low-frequency band high absorption rate and construct a wide stopband in the high-frequency band in the OFF state while taking into account the low-frequency absorption and mid-frequency reflection performance in the ON state. The wide stopband constructed in the high-frequency band is used to introduce a polarization twist layer to realize the function of 22% bandwidth polarization conversion. The unit size is 30* 30mm2 , and the overall thickness is 42.35mm ( 0.133λL , λL is the wavelength corresponding to the lowest frequency of the working frequency band).
本发明通过加载螺旋电感可以实现中频段的宽阻带的构建，为了引入更多功能的构建，将下层地板替换为可重构渐变梯形频率选择表面，通过PIN管的开关可以实现中频段透射、反射的切换，再此基础上利用等效电路表征和多参数协同设计方法，通过调整层间高度，可实现高频段阻带的构建。引入极化扭转层可实现高频段极化扭转功能，利用极化相位相消，可实现漫散射功能。本发明能够拓展传统电磁设备应用场景适应性与生存力，在信息安全、抗电磁干扰、雷达天线罩、电磁信息与体系对抗等领域有着重要的学术价值和应用前景。由此进一步探索进行宽频有源吸波材料的综合设计方案，可以应对各种复杂电磁环境智能技战术的迫切需求。The present invention can realize the construction of a wide stopband in the mid-frequency band by loading a spiral inductor. In order to introduce more functional construction, the lower floor is replaced by a reconfigurable gradient trapezoidal frequency selection surface. The switching of the mid-frequency band transmission and reflection can be realized by the switch of the PIN tube. On this basis, the equivalent circuit characterization and multi-parameter collaborative design method are used to adjust the interlayer height to realize the construction of a high-frequency stopband. The introduction of a polarization twist layer can realize the polarization twist function in the high-frequency band, and the polarization phase cancellation can be used to realize the diffuse scattering function. The present invention can expand the adaptability and survivability of traditional electromagnetic equipment application scenarios, and has important academic value and application prospects in the fields of information security, anti-electromagnetic interference, radar antenna cover, electromagnetic information and system confrontation. Further exploration of the comprehensive design scheme of broadband active absorbing materials can meet the urgent needs of intelligent techniques and tactics in various complex electromagnetic environments.
本发明的超表面创新性的仅利用3层结构实现了吸波、透波、极化扭转、反射、频选、增透、漫散射等7种功能的设计，且各功能带宽均满足20％以上。The metasurface of the present invention innovatively realizes the design of seven functions, namely, wave absorption, wave transmission, polarization twisting, reflection, frequency selection, anti-reflection, and diffuse scattering, by using only three layers of structure, and the bandwidth of each function meets more than 20%.
实施例Example
结合图1～图4，本发明的宽带可重构多功能电磁超表面，其低漫散射工作频率为0.5～8GHz，它整体结构分为三层，包括上层极化扭转层1、中层电阻损耗层2以及下层可重构频率选择表面层3。极化层具备极化扭转和漫散射功能，厚度为0.127mm即0.0022波长,工作频段为5.24-6.54GHz；损耗曾具备吸波功能，厚度为1.57mm即0.005波长，工作频段为0.94-3.35GHz,可重构频选层具备透射、反射、可重构功能，厚度为3.7mm即0.018波长，工作频段为3.35-5.05GHz。所述极化扭转层(1)使用了单层0.127mm厚的Rogers RT/duroid5880，介电常数为2.2的微波基片，上面加载了中心对称的“箭头”型金属贴片(4)；所述电阻损耗层(2)使用了1.57mm厚的Rogers RT/duroid 5880，介电常数为2.2的微波基片，其正面为八个0402封装电阻(5)和正方形金属条带(6)，反面为四个螺旋电感(7)；所述可重构频率选择表面3使用了FR-4_epoxy，介电常数为4.4的微波基片，整体厚度为3.7mm，由上到下分为五层，依次为：渐变梯形金属贴片8与PIN二极管9、介质基板、条带性金属贴片10、介质基板、方形金属贴片11。五层结构通过PCB工艺压合而成。电阻损耗层使用的电阻型号为阻值180欧姆的0402型封装电阻，可重构频选层使用的PIN二极管型号为SMP1345-040LF。层与层之间通过空气隔开，整体高度为42.35mm。Combined with Figures 1 to 4, the broadband reconfigurable multifunctional electromagnetic metasurface of the present invention has a low diffuse scattering operating frequency of 0.5 to 8 GHz, and its overall structure is divided into three layers, including an upper polarization twist layer 1, a middle resistance loss layer 2, and a lower reconfigurable frequency selective surface layer 3. The polarization layer has polarization twist and diffuse scattering functions, a thickness of 0.127 mm, i.e., 0.0022 wavelengths, and an operating frequency range of 5.24-6.54 GHz; the loss layer has an absorbing function, a thickness of 1.57 mm, i.e., 0.005 wavelengths, and an operating frequency range of 0.94-3.35 GHz; the reconfigurable frequency selective layer has transmission, reflection, and reconfigurable functions, a thickness of 3.7 mm, i.e., 0.018 wavelengths, and an operating frequency range of 3.35-5.05 GHz. The polarization twisting layer (1) uses a single layer of 0.127 mm thick Rogers RT/duroid5880 microwave substrate with a dielectric constant of 2.2, on which a centrally symmetrical "arrow" shaped metal patch (4) is loaded; the resistance loss layer (2) uses a 1.57 mm thick Rogers RT/duroid 5880 microwave substrate with a dielectric constant of 2.2, with eight 0402 package resistors (5) and square metal strips (6) on the front side and four spiral inductors (7) on the back side; the reconfigurable frequency selective surface 3 uses FR-4_epoxy, a microwave substrate with a dielectric constant of 4.4, with an overall thickness of 3.7 mm, and is divided into five layers from top to bottom, namely: a gradient trapezoidal metal patch 8 and a PIN diode 9, a dielectric substrate, a strip metal patch 10, a dielectric substrate, and a square metal patch 11. The five-layer structure is laminated by a PCB process. The resistor model used in the resistance loss layer is a 0402 package resistor with a resistance value of 180 ohms, and the PIN diode model used in the reconfigurable frequency selection layer is SMP1345-040LF. The layers are separated by air, and the overall height is 42.35 mm.
图5是本发明多功能可重构电磁超表面单元在PIN二极管OFF状态下的S参数，可以看出S21参数在中间频段近似为零，呈透射状态。FIG5 is the S parameter of the multifunctional reconfigurable electromagnetic metasurface unit of the present invention when the PIN diode is in the OFF state. It can be seen that the S21 parameter is approximately zero in the intermediate frequency band and is in a transmission state.
图6是本发明多功能可重构电磁超表面单元在PIN二极管ON状态下的S参数，可以看出此时单元呈全反射状态。FIG6 is the S parameter of the multifunctional reconfigurable electromagnetic metasurface unit of the present invention when the PIN diode is in the ON state. It can be seen that the unit is in a total reflection state at this time.
图7是本发明多功能可重构电磁超表面单元在在单极化入射波下的反射Rxx和反射Ryx结果图。Ryx：x极化入射波转化为y极化的反射系数；Rxx：x极化波反射系数。Figure 7 is a graph showing the reflection Rxx and reflection Ryx results of the multifunctional reconfigurable electromagnetic metasurface unit of the present invention under a single polarized incident wave. Ryx: reflection coefficient of the x-polarized incident wave converted into y-polarized wave; Rxx: reflection coefficient of the x-polarized wave.
图8是本发明多功能可重构电磁超表面“0”单元和“1”单元之间相位实际值与差值结果图。其中“0”单元和“1”单元是中心对称结构，区别在于仅极化层箭头方向呈中心对称位置分布。Figure 8 is a diagram showing the actual phase value and difference between the "0" unit and the "1" unit of the multifunctional reconfigurable electromagnetic metasurface of the present invention. The "0" unit and the "1" unit are centrosymmetric structures, the difference being that only the arrow direction of the polarization layer is centrosymmetric.
图9是本发明多功能可重构电磁超表面“0”单元和“1”单元各自组成5×5的子阵，子阵组成棋盘式排布的超表面阵列示意图。9 is a schematic diagram of a metasurface array in which the multifunctional reconfigurable electromagnetic metasurface "0" units and "1" units of the present invention each form a 5×5 sub-array, and the sub-arrays form a checkerboard arrangement.
图10是本发明多功能可重构电磁超表面阵列在TE/TM极化下与等口径金属地板RCS对比结果图。可以看出两种极化方式下相较于金属地板，该阵列结构的RCS均有降低。Figure 10 is a graph showing the RCS comparison between the multifunctional reconfigurable electromagnetic metasurface array of the present invention and the metal floor of equal aperture under TE/TM polarization. It can be seen that the RCS of the array structure is reduced compared with the metal floor under both polarization modes.
图11是本发明多功能可重构电磁超表面阵列ON状态下不同入射角度下双站RCS缩减曲线图。可以看出在0°、15°、30°不同角度入射下阵列RCS在工作频带内均具有10dB以上缩减。Figure 11 is a bistatic RCS reduction curve at different incident angles when the multifunctional reconfigurable electromagnetic metasurface array of the present invention is in the ON state. It can be seen that the array RCS is reduced by more than 10 dB within the working frequency band at different incident angles of 0°, 15°, and 30°.
图12是本发明多功能可重构电磁超表面阵列加工样机实物图。FIG12 is a physical picture of the multifunctional reconfigurable electromagnetic metasurface array processing prototype of the present invention.
综上所述，本发明提出一种具有具备吸波、透射、反射、频选、极化扭转以及漫散射多种功能于一体的电磁超表面设计。针对新一代电磁频谱战系统对超宽带、低剖面、高效率、多功能、高集成的需求，团队设计了一款兼顾带宽、功能与频段连续特性的可重构超表面。同时解决了尽可能使用较少的层数实现超表面多功能的高集成。并能够服务于新一代电磁频谱战中的地面战车、舰载、机载超宽带阵列雷达中，提升宽带紧耦合阵列的宽频宽空域低散射隐身性能。In summary, the present invention proposes an electromagnetic metasurface design that integrates multiple functions such as wave absorption, transmission, reflection, frequency selection, polarization twisting and diffuse scattering. In response to the requirements of the new generation of electromagnetic spectrum warfare systems for ultra-wideband, low profile, high efficiency, multi-function and high integration, the team designed a reconfigurable metasurface that takes into account the characteristics of bandwidth, function and frequency band continuity. At the same time, it solves the problem of using as few layers as possible to achieve high integration of metasurface multi-functions. It can also serve the ground combat vehicles, shipborne, and airborne ultra-wideband array radars in the new generation of electromagnetic spectrum warfare, and improve the wide-band and wide-spatial low-scattering stealth performance of the broadband tightly coupled array.
上述实施例仅例示性说明本发明的原理及其功效，而非用于限制本发明。任何熟悉此技术的人士皆可在不违背本发明的精神及范畴下，对上述实施例进行修饰或改变。因此，举凡所属技术领域中具有通常知识者在未脱离本发明所揭示的精神与技术思想下所完成的一切等效修饰或改变，仍应由本发明的权利要求所涵盖。The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.
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