CN105406156A - Cylindrical frequency selective surface structure - Google Patents
Cylindrical frequency selective surface structure Download PDFInfo
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- CN105406156A CN105406156A CN201510854273.7A CN201510854273A CN105406156A CN 105406156 A CN105406156 A CN 105406156A CN 201510854273 A CN201510854273 A CN 201510854273A CN 105406156 A CN105406156 A CN 105406156A
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- cylinder
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
- H01Q1/425—Housings not intimately mechanically associated with radiating elements, e.g. radome comprising a metallic grid
Abstract
A cylindrical frequency selective surface structure belongs to the technical field of wireless communication and solves the problems of poor filtering characteristic and stability generally existing in a curved frequency selective surface. The cylindrical frequency selective surface structure disclosed by the invention comprises a metal layer and a dielectric layer with a thickness of 1 millimeter, the dielectric constant of the dielectric layer is 2.2, the magnetic conductivity of the dielectric layer is 1, through holes are fully etched on the surface of the metal plate in a rectangular lattice shape and are Y-shaped, the distance of each two adjacent Y-shaped through holes is 40 millimeters, the metal plate (1) is bent according to a cylindrical surface with a curvature radius of 160 millimeters, and the dielectric layer is in contact with the inner side of the metal layer. The cylindrical frequency selective surface structure is suitably used as a conformal cylindrical antenna cover.
Description
Technical field
The invention belongs to wireless communication technology field.
Background technology
Frequency-selective surfaces FrequencySelectiveSurface, FSS are a kind of periodic structures of single or multiple lift, are generally formed according to certain aligned transfer by the aperture unit on metal patch or metal screen.As a kind of spatial filter, the electromagnetic wave of FSS to different frequency, different incidence angles and polarization mode presents different scattering propertiess, thus can effectively control electromagnetic transmittance and reflectance.When incident wave frequency is near the resonance frequency of aperture unit or chip unit, the characteristic of total reflection or total transmissivity will be presented.FSS can be used as radome, multifrequency reflector antenna, polarizer and waveguide filter etc., is widely used in the electronic equipment of the communications field.So far the theoretical research of FSS is mostly based upon on the large basis of plane limitless, but frequency-selective surfaces adopted in actual applications is all generally curved surface, greatly limited.Relative to the large FSS structure of plane limitless, FSS due to curved-surface structure does not present the periodicity of strict similar two dimensional surface FSS, when plane electromagnetic wave is incident, the coupled problem of multi-angle incident wave transmittance and reflectance wave reflection will be presented, make the analysis of problem become quite complicated.And cylindrical structure is as a kind of curved surface with typical representative, further investigation and the design of vague generalization curved surface FSS will be contributed to from research and design cylinder frequency-selective surfaces hereinafter referred to as setting about cylinder FSS.
Summary of the invention
The present invention is the problem in order to solve the ubiquitous filtering characteristic of curved surface frequency-selective surfaces and poor stability, proposes a kind of cylinder frequency-selective surfaces structure.
Cylinder frequency-selective surfaces structure of the present invention, it comprises the dielectric layer 3 that metallic plate 1 and thickness are 1mm, and the dielectric constant of described dielectric layer 3 is 2.2, and magnetic permeability is 1; Through hole 2 is carved with by rectangular grid shape in the surface of described metallic plate 1, the shape of described through hole 2 is Y shape, every two adjacent Y shape holes are 40mm along the spacing on post surface, and metallic plate 1 is the cylinder bending of 160mm according to radius of curvature, and dielectric layer 3 is fitted in the inner side of metallic plate 1.
Y shape pore structure unit of the present invention adopts the arrangement mode of rectangular grid; Shown in Fig. 1, each unit is 40mm along the spacing (expanding into the cycle of planar structure) on post surface; Dielectric layer is carried in FSS side, and thickness chooses d=1mm, DIELECTRIC CONSTANT ε
r=2.2, magnetic permeability μ=1, devise the face of cylinder FSS that a kind of radius of curvature is 160mm, the process that designs and produces of Y shape hole cylinder FSS is: first in planar metal plate, open Y shape hole periodically according to corresponding size size, form the two-dimensionally periodic structure of plane, then the curvature of this planar structure according to expection cylinder is bent, then with the mode loaded medium layer attached, finally just define illustrated circular port cylinder FSS.Avoid out the coupled problem of multi-angle incident wave transmittance and reflectance wave reflection.Electromagnetic simulation software based on Finite Difference Time Domain carries out simulation calculation to uniform plane wave vertical irradiation in space in the situation of curved surface FSS structure, obtain the S parametric line and comparison diagram 7 to Figure 10 that reflect curved surface FSS electromagnetism transmissison characteristic and reflection characteristic, 4 width S parameter curve charts find, the cylinder FSS of Y shape pore structure unit exists at 3.6GHz place comparatively obviously and the resonance band of broader bandwidth, and be with inner curve smoother comparatively speaking, this illustrates that there is good filtering characteristic in Y shape hole as the construction unit of cylinder frequency-selective surfaces.
Accompanying drawing explanation
Fig. 1 is the structural representation of cylinder frequency-selective surfaces of the present invention;
Fig. 2 is the structural representation in the Y shape hole described in embodiment two;
Fig. 3 is the structural representation of the circular port described in embodiment three;
Fig. 4 is the structural representation in the annular hole described in embodiment four;
Fig. 5 is the cruciform vent structural representation described in embodiment five;
Fig. 6 is the situation schematic diagram of electromagnetic wave even incident Y shape hole cylinder frequency-selective surfaces;
Fig. 7 is the S parametric line figure of circular port cylinder frequency-selective surfaces;
Fig. 8 is the S parametric line figure of annular hole cylinder frequency-selective surfaces;
Fig. 9 is the S parametric line figure of substantive hole cylinder frequency-selective surfaces;
Figure 10 is the S parametric line figure of Y shape hole cylinder frequency-selective surfaces;
Far-field radiation directional pattern when Figure 11 is incident wave f=7GHz
RCS figure when Figure 12 is incident wave f=7GHz;
Figure 13 is the three-dimensional space direction figure of far-field radiation.
Embodiment
Embodiment one, composition graphs 1 illustrate present embodiment, the cylinder frequency-selective surfaces structure described in present embodiment, and it comprises the dielectric layer 3 that metallic plate 1 and thickness are 1mm, and the dielectric constant of described dielectric layer 3 is 2.2, and magnetic permeability is 1; Through hole 2 is carved with by rectangular grid shape in the surface of described metallic plate 1, the shape of described through hole 2 is Y shape, every two adjacent Y shape holes are 40mm along the spacing on post surface, and metallic plate 1 is the cylinder bending of 160mm according to radius of curvature, and dielectric layer 3 is fitted in the inner side of metallic plate 1.
The material of the metallic plate described in present embodiment is the metal with high conductivity.
Embodiment two, present embodiment are further illustrating the cylinder frequency-selective surfaces described in embodiment one, and the length of three hole arms in Y shape hole is 16mm, and width is 4mm.
Embodiment three, composition graphs 3 illustrate present embodiment, present embodiment is the difference of the cylinder frequency-selective surfaces structure described in embodiment one, the shape of through hole 2 is circular port, the diameter of circular hole is 32mm, and the distance along dielectric layer cylinder direction between every two rounded opening edge is 8mm.
Embodiment four, composition graphs 4 illustrate present embodiment, present embodiment is the difference of the cylinder frequency-selective surfaces described in embodiment one, the shape of through hole 2 is annular hole, the outer diameter of a circle of annulus is 34mm, in annulus, circular diameter is 18mm, and the distance along dielectric layer cylinder direction between every two annulus cylindricals is 6mm.
Embodiment five, composition graphs 5 illustrate present embodiment, present embodiment is the difference of the cylinder frequency-selective surfaces structure described in embodiment one, the length of cross bore mesopore post is 32mm, the width of cross bore mesopore post is the top of 8mm, Kong Zhu is 8mm along dielectric layer cylinder direction distance.
The mode that the structure of FSS array element is chosen and arranged has important impact to FSS Electromagnetic Scattering Characteristics especially transmissison characteristic.The size of unit can affect the resonance center frequeH of FSS.In general, the resonance frequency of the FSS be made up of annular element approximates the girth of loop configuration; For annular element, during the linkage unit resonance of center, size is comparatively large, and the span from top to terminal is about λ/2, and annular element size value is between λ/4 to λ/3, and be not as tight like that as annular element during arrangement; Internal entity unit (plate-shaped unit) structure is simple, is the unit form studied the earliest, but produce graing lobe when organizing battle array more comparatively obvious due to it, so general not recommendation in actual applications.The arrangement of frequency-selective surfaces array element structure is generally divided into two kinds in addition, i.e. rectangular grid arrangement and triangle grid.In order to avoid interference graing lobe occurs, no matter select any arrangement mode, the unit interval of frequency-selective surfaces all should be less than a certain characteristic value, and choosing of FSS unit interval will minimize the impact of graing lobe.Because the FSS performance of aperture and paster and characteristic can be thought complementary, the present invention studies mainly for aperture type construction unit.
Fig. 2, to Figure 5 shows that four kinds of construction unit forms that the present invention mainly studies, is respectively circular port, annulus hole, cross bore and Y shape hole, and the size of each construction unit marks (unit: mm) in the drawings.The present invention has then done the Electromagnetic Scattering Characteristics of designed cylinder FSS and has probed into further.As shown in Figure 6, for ordinary circumstance, adopt the situation of plane TM ripple uniform irradiation on cylinder FSS top.For weighing FSS structure to the transmittance and reflectance characteristic of incident electromagnetic wave, have employed S parameter and described, namely S21 shows electromagnetic transmission coefficient, and S11 weighs electromagnetic reflection case.Fig. 4 is to adopting above-mentioned 4 kinds of construction unit cylinder FSS to carry out the S parameter comparison diagram that simulation calculating draws.Therefrom can find out, be different from the large FSS of plane limitless, the reforming phenomena of cylinder FSS each S parameter curve in whole frequency spectrum is comparatively obvious, this is because curved-surface structure destroys the periodicity of construction unit on two dimensional surface, coupling condition between unit is deteriorated, and on the other hand, curved-surface structure also can bring edge diffraction, makes the generation of this reforming phenomena inevitable.Contrast 4 width S parameter curve charts to find, the cylinder FSS of Y shape pore structure unit exists at 3.6GHz place comparatively obviously and the resonance band of broader bandwidth, and be with inner curve smoother comparatively speaking, this illustrates that there is good filtering characteristic in Y shape hole as the construction unit of cylinder frequency-selective surfaces, should pay the utmost attention to when designing cylinder FSS.
The Electromagnetic Scattering Characteristics of cylinder FSS designed by pictute, the three-dimensional space direction figure of far-field radiation and the RCS figure of circumferential and axial both direction is adopted to represent, as situation when Figure 11, Figure 12 and the incident TM ripple frequency that Figure 13 shows that Y shape hole cylinder FSS are 7GHz.From RCS figure, circumference in, Y shape hole cylinder FSS is to electromagnetic lateral scattering ability more by force and relatively evenly, while less at the graing lobe of transmission direction generation; And the graing lobe axially produced is more, this mainly because the electromagnetic scattering on axis is mainly made up of cylinder FSS top reflective and edge diffraction, therefore there will be multiple new scattering spectra.
The present invention proposes a kind of specific size cylinder FSS, realized with 4 kinds of different structure unit respectively.S parametric line figure is utilized to reflect transmittance and reflectance performance, directional pattern and RCS figure reflection spatial electromagnetic scattering properties.Wherein Y shape hole cylinder FSS resonance phenomena obviously and broader bandwidth, has good filtering characteristic.Cylinder FSS structure of the present invention can be used for the radome as a certain specific cylinder shaped antenna, and the present invention simultaneously selects the further investigation on surface and design to play well directiveness effect to general surface structure frequency.
Claims (5)
1. cylinder frequency-selective surfaces structure, is characterized in that, it comprises the dielectric layer (3) that metallic plate (1) and thickness are 1mm, and the dielectric constant of described dielectric layer (3) is 2.2, and magnetic permeability is 1; Through hole (2) is carved with by rectangular grid shape in the surface of described metallic plate (1), the shape of described through hole (2) is Y shape, every two adjacent Y shape holes are 40mm along the spacing on post surface, metallic plate (1) is the cylinder bending of 160mm according to radius of curvature, and dielectric layer (3) is fitted in the inner side of metallic plate (1).
2. cylinder frequency-selective surfaces structure according to claim 1, is characterized in that, the length of three hole arms in Y shape hole is 16mm, and width is 4mm.
3. cylinder frequency-selective surfaces structure according to claim 1, is characterized in that, the shape of through hole (2) is circular port, and the diameter of circular hole is 32mm, and the distance along dielectric layer cylinder direction between every two rounded opening edge is 8mm.
4. cylinder frequency-selective surfaces structure according to claim 1, it is characterized in that, the shape of through hole (2) is annular hole, and the outer diameter of a circle of annulus is 34mm, in annulus, circular diameter is 18mm, and the distance along dielectric layer cylinder direction between every two annulus cylindricals is 6mm.
5. cylinder frequency-selective surfaces structure according to claim 1, it is characterized in that, the shape of through hole (2) is cruciform vent, and the length of cross bore mesopore post is 32mm, the width of cross bore mesopore post is the top of 8mm, Kong Zhu is 8mm along dielectric layer cylinder direction distance.
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Cited By (9)
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| CN105528475A (en) * | 2015-11-27 | 2016-04-27 | 哈尔滨工业大学 | Method for obtaining electromagnetic scattering characteristics of cylindrical frequency selective surface |
| CN106450786A (en) * | 2016-12-07 | 2017-02-22 | 中国电子科技集团公司第五十四研究所 | Frequency selective reflector with bandwidth and wide angle operation |
| CN106992339A (en) * | 2017-03-24 | 2017-07-28 | 电子科技大学 | It is a kind of applied to WLAN dual-frequency point characteristics of conformal wave filter and preparation method thereof |
| CN108886199A (en) * | 2016-04-08 | 2018-11-23 | 三菱电机株式会社 | Resonant element, frequency option board and the antenna assembly of frequency option board |
| CN109950700A (en) * | 2019-03-01 | 2019-06-28 | 浙江大学 | A kind of electric scanning lens antenna based on the conformal fresnel surface of multilayer |
| CN110707434A (en) * | 2019-09-12 | 2020-01-17 | 华中科技大学 | Cylindrical conformal active frequency selective surface wave absorbing device, preparation and application thereof |
| CN112751190A (en) * | 2020-12-24 | 2021-05-04 | 航天时代飞鸿技术有限公司 | Flexible antenna based on metamaterial structure and signal transmission device |
| US20220349967A1 (en) * | 2021-04-28 | 2022-11-03 | Canon Medical Systems Corporation | Arrayed structure and magnetic resonance imaging apparatus |
| CN117424002A (en) * | 2023-12-19 | 2024-01-19 | 四川九洲电器集团有限责任公司 | Design and use methods of 0-90-degree conformal FSS plate and FSS plate |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105528475A (en) * | 2015-11-27 | 2016-04-27 | 哈尔滨工业大学 | Method for obtaining electromagnetic scattering characteristics of cylindrical frequency selective surface |
| CN108886199A (en) * | 2016-04-08 | 2018-11-23 | 三菱电机株式会社 | Resonant element, frequency option board and the antenna assembly of frequency option board |
| CN106450786A (en) * | 2016-12-07 | 2017-02-22 | 中国电子科技集团公司第五十四研究所 | Frequency selective reflector with bandwidth and wide angle operation |
| CN106450786B (en) * | 2016-12-07 | 2019-12-03 | 中国电子科技集团公司第五十四研究所 | A kind of frequency selection subreflector of broadband and wideangle work |
| CN106992339A (en) * | 2017-03-24 | 2017-07-28 | 电子科技大学 | It is a kind of applied to WLAN dual-frequency point characteristics of conformal wave filter and preparation method thereof |
| CN109950700A (en) * | 2019-03-01 | 2019-06-28 | 浙江大学 | A kind of electric scanning lens antenna based on the conformal fresnel surface of multilayer |
| CN110707434A (en) * | 2019-09-12 | 2020-01-17 | 华中科技大学 | Cylindrical conformal active frequency selective surface wave absorbing device, preparation and application thereof |
| CN110707434B (en) * | 2019-09-12 | 2020-09-18 | 华中科技大学 | Cylindrical conformal active frequency selective surface wave absorbing device, preparation and application thereof |
| CN112751190A (en) * | 2020-12-24 | 2021-05-04 | 航天时代飞鸿技术有限公司 | Flexible antenna based on metamaterial structure and signal transmission device |
| CN112751190B (en) * | 2020-12-24 | 2023-01-20 | 航天时代飞鸿技术有限公司 | Flexible antenna based on metamaterial structure and signal transmission device |
| US20220349967A1 (en) * | 2021-04-28 | 2022-11-03 | Canon Medical Systems Corporation | Arrayed structure and magnetic resonance imaging apparatus |
| US11921175B2 (en) * | 2021-04-28 | 2024-03-05 | Canon Medical Systems Corporation | Arrayed structure and magnetic resonance imaging apparatus |
| CN117424002A (en) * | 2023-12-19 | 2024-01-19 | 四川九洲电器集团有限责任公司 | Design and use methods of 0-90-degree conformal FSS plate and FSS plate |
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Application publication date: 20160316 |