CN104538744B - Electromagnetic hard surface structure applied to metal cylinder and construction method thereof - Google Patents
Electromagnetic hard surface structure applied to metal cylinder and construction method thereof Download PDFInfo
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- CN104538744B CN104538744B CN201410720282.2A CN201410720282A CN104538744B CN 104538744 B CN104538744 B CN 104538744B CN 201410720282 A CN201410720282 A CN 201410720282A CN 104538744 B CN104538744 B CN 104538744B
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Abstract
Provided in the invention is an electromagnetic hard surface structure applied to a metal cylinder and a construction method thereof. Particularly, the invention, which belongs to the field of the microwave technology, relates to an electromagnetic hard surface structure and a construction method thereof, so that electromagnetic wave propagation can be enhanced in a specific frequency band. The electromagnetic hard surface structure is formed by a magnetic dielectric layer and a metal paster layer, wherein rectangular metal pasters are successively arranged along the long side direction of the magnetic dielectric layer to form the metal paster layer and the spaced width of the rectangular metal pasters is g. The magnetic dielectric layer completely covers the bottom of the metal paster layer; and the thickness is d, the width is 1, and the length is h. The width of each metal paster is w and the length is 1. Exp (4 pi d/(w+d)) ＞ 1, g/w ＜ 0.2, (w+g)/lambda0 ＜ 0.25, lambda 0 = c/f0, 1= 2 pi (r+d), and h = n * (w+g)-g, wherein n is larger than or equal to 4 and n is a positive integer, the lambda 0 expresses the operating wavelength of the incident wave in free space, the c expresses the speed of light in the free space, and the f0 expresses the working frequency of the incident wave in the free space. When being applied, the electromagnetic hard surface structure is loaded to the side surface of the metal cylinder. According to the invention, with the electromagnetic hard surface structure and the construction method thereof, the forward scattering of the electromagnetic wave by the metal cylinder can be reduced.
Description
Technical field
The present invention relates to a kind of electromagnetism crust structure that can reduce metal cylinder electromagnetic scattering in special frequency band and its
Construction method, belongs to microwave technical field.
Background technology
Metal cylinder is the typical body of electromagnetic scattering problems, and studying its Electromagnetic Scattering Characteristics can promote complex target scattering special
Journal of Sex Research.Metal cylinder can regard a kind of gap scattering as, cause antenna pair near antenna, its scattering based on " Babinet " principle
Lobe increases, and gain reduces, such as, due to the presence of feed metal cylinder support in Cassegrain antenna, cause its electrical property to move back
Change obvious.In microwave dark room, the metallic support of cylinder has the high intensity not available for foam stand, extensively should obtain
With, but its scattering properties affects measuring accuracy.In order to reduce scattering of the metal cylinder to electromagnetic wave, researcher proposes
Many different methods.The stealthy cover of wherein widely used Meta Materials, i.e., make electromagnetic wave super by the design to material and structure
Detour in material cover so as to reduce forward scattering.However, the method design is extremely complex, the stealthy cover of Meta Materials is general more stupid
Weight, cost is very high, and bandwidth is also very narrow, is not suitable for practical application.
Electromagnetism crust structure has the property for strengthening specific direction Electromagnetic Wave Propagation, can be applicable to reduce metal cylinder
Scattering to electromagnetic wave.Relative to the stealthy cover structure of Meta Materials, its design is simple, low cost, and broader bandwidth.At present electromagnetism is hard
The research on surface is primarily upon two aspects：One is the broadening of crust bandwidth, and two is miniaturization technology.In early-stage Study, Per-
Simon Kildal propose to reduce metal cartridge scattering using crust, and provide a kind of electromagnetism crust method for designing.For example
The crust thickness obtained according to its design formula when centre frequency is 4.2GHz is about 9.41mm, and relative bandwidth is about
14.3%.But, when lower frequency is applied to, thickness is thicker and quality weight, is unsuitable for reality for the method gained electromagnetism crust structure
Apply on border.
The content of the invention
The purpose of the present invention is the electromagnetism crust knot that a kind of metal cylinder is proposed for above-mentioned existing problems or deficiency
Structure.
The electromagnetism crust structure is made up of metal patch layer, magnetic medium layer；Magnetic medium layer is completely covered metal patch
Lamella bottom, thickness is d, and width is l, and length is h；Metal patch layer by a distance of width for g rectangular metal paster along magnetic
Dielectric layer long side direction is arranged in order composition, and metal patch width is w, and length is l, and its material is high conductivity metal, described
It surround along metal patch slice width edge direction during electromagnetism crust application and loads on metal cylinder body side surface, the height of metal cylinder
Spend for h, radius is r,
G/w ＜ 0.2, (w+g)/λ0＜ 0.25, λ0=c/f0, l=2 π (r+d), h=n × (w+g) ± g, n >=4, n is for just
Integer, λ0For the operation wavelength of incidence wave in free space, c is the light velocity in free space, f0For the work of incidence wave in free space
Working frequency.
The magnetic conductivity of magnetic medium layer used magnetic material is more than 1.
Its construction method is：
Step one：A plane electromagnetic crust model of element is set up in Ansoft-HFSS, the model is by three parts
Constitute, be successively from top to bottom metal patch layer, magnetic medium layer, stratum；Metal patch layer is set to desired electrical and leads with stratum
Body, builds the cuboid air box that a size is fitted with it, the hard table of electromagnetism on the electromagnetism crust model of element set up
Face model of element is located at the center of air box, and air box height is 16 times of magnetic medium layer, is set on the top of air cartridge
Floquet Port ports are put, boundary condition is set to principal and subordinate boundary condition Master/Slave, emulates plane wave reflected phase
With the variation relation of frequency, scanning optimization obtains reflected phase corresponding frequency in zero degree and is located at centre frequency environs
Plane electromagnetic crust structural parameters size；
Step 2：By step one for the plane electromagnetic crust structural parameters size application obtained by centre frequency optimization
To in annular electromagnetism crust, the model that metal cylinder loads electromagnetism crust is set up in FEKO, in central frequency range
The Monostatic RCS RCS of the model is emulated, because electromagnetism crust loads on metal cylinder surface, so electromagnetism is hard
Surface does not need ground layer segment, the model to be made up of three parts, and from-inner-to-outer is successively metal cylinder, and magnetic medium layer is golden
Category patch layer；Metal cylinder is perfact conductor with all metal patches in metal patch layer；
Step 3：The metal cylinder body Model of crust is not loaded in establishment step two in FEKO, metal cylinder is
Perfact conductor, the mono- static RCS of the model in the central frequency range that calculation procedure one determines；
Step 4：Electromagnetism crust structure is prepared according to step one to the three parameters designs for obtaining.
Electromagnetism crust design feature of the invention designed is：The magnetic of ground connection will be loaded at a distance of very near metal patch
Property material on, possess high-impedance behavior in the CF structure and then constitute electromagnetism crust.And Per-Simon Kildal
Electromagnetism crust structure Deng proposition is then only realized high-impedance behavior by certain thickness non-magnetic media and then constructs electricity
Magnetic crust.Compared with it, when low frequency applications are particularly for same centre frequency, such as during 4.2GHz, the electromagnetism of the present invention
Crust thickness is 2mm, and bandwidth is about 22.2%, and the electromagnetism crust structural thickness of the proposition such as Per-Simon Kildal is
9.41mm, bandwidth is about 14.3%.
In sum the present invention has compared with prior art advantages below：
1st, for the more existing electromagnetism crust structure of electromagnetism crust structure in the present invention, bandwidth is wider；
2nd, electromagnetism crust thickness when being applied to reduce metal cylinder electromagnetic scattering significantly reduces.
Description of the drawings
Fig. 1 is plane electromagnetic crust schematic top plan view of the present invention, unit (mm)；
Fig. 2 is plane electromagnetic crust unit simulation model schematic top plan view of the present invention；
Fig. 3 is plane electromagnetic crust unit simulation model side view of the present invention；
Fig. 4 is the HFSS simulation result schematic diagrams of plane electromagnetic crust incidence wave reflected phase of the present invention；
Fig. 5 be load electromagnetism crust metal cylinder top view, unit (mm)；
Fig. 6 be load electromagnetism crust metal cylinder model schematic, unit (mm)；
Fig. 7 is the metal cylinder mono- static RCS result of calculation contrast for not loading electromagnetism crust and loading electromagnetism crust
Schematic diagram.
Specific embodiment
The present invention is described in further detail referring to the drawings.
Such as Fig. 6, the present invention is by the electromagnetism crust unit periodic extension shape on metal cylinder in one direction
Into 13 × 1 electromagnetism crust structures.Each electromagnetism crust unit is made up of three parts, such as Fig. 5, and from-inner-to-outer is successively gold
Category cylinder, magnetic medium layer, metal patch layer.Metal cylinder, metal patch is good conductor, metal cylinder radius r
=12mm, height h=94mm, metal patch width w=6.8mm, gap width g=0.4mm between paster.Magnetic medium thickness
Spend for d=2mm, its dielectric constant is 4.6, and magnetic conductivity is 1.8.
A kind of construction method of electromagnetism crust structure of the present invention, specific implementation step is as follows.
Step one：A plane electromagnetic crust model of element is set up in Ansoft-HFSS, the model is by three parts
Constitute, be successively from top to bottom metal patch layer, magnetic medium layer, stratum, such as Fig. 2, shown in Fig. 3.Metal patch layer and stratum
Perfect electric conductor plane is set to, metal patch size is 6.8 × 7.2mm2, stratum size is 7.2 × 7.2mm2.Magnetic medium
It is 7.2 × 7.2 × 2mm that layer is size3Rectangular block, material dielectric constant is 4.6, and magnetic conductivity is 1.8.It is hard in the electromagnetism set up
The cuboid air box that a size is fitted with it is built on surface cell model, height is 16 times of magnetic medium layer, electricity
Magnetic crust unit is located at air cartridge subcenter.Floquet Port ports are set on the top of air cartridge, boundary condition is arranged
For principal and subordinate boundary condition Master/Slave, to drive mould (Driven Model) to emulate plane wave reflected phase in 2-14GHz
With the variation relation of frequency, scanning optimization obtains reflected phase corresponding frequency in zero degree and is located at centre frequency environs
Plane electromagnetic crust structural parameters size, be as a result about as shown in figure 4, obtaining corresponding frequency when reflected phase is zero
4.2GHz.The electromagnetism crust thickness of this frequency of correspondence is only 2mm in the present invention, and the electricity of the proposition such as Per-Simon Kildal
Magnetic crust structure desired thickness in 4.2GHz is 9.41mm.
Step 2：By step one for the plane electromagnetic crust structural parameters size application obtained by centre frequency optimization
To in annular electromagnetism crust, the physical model that metal cylinder loads electromagnetism crust is set up in FEKO, such as Fig. 5 and Fig. 6 institutes
Show.The Monostatic RCS RCS of the model in frequency range 2.5GHz to 6GHz is calculated using moment method (MoM).Should
Model is made up of three parts, and from-inner-to-outer is successively metal cylinder, magnetic medium layer, metal patch layer.Metal cylinder, gold
All metal patches in category patch layer are perfact conductor, metal cylinder radius r=12mm, height h=94mm, metal patch
Piece width w=6.8mm, gap width g=0.4mm between paster.Magnetic medium thickness degree is d=2mm, and its dielectric constant is
4.6, magnetic conductivity is 1.8.Mono- static RCS simulation result is as shown in Figure 7.
Step 3：The metal cylinder body Model of crust is not loaded in establishment step two in FEKO, metal cylinder is
Perfact conductor, size is identical with step 2, and using moment method its mono- static RCS in the range of 2.5GHz-6GHz is calculated, as a result such as Fig. 7
It is shown.As seen from the figure, the metal cylinder volume scattering after centre frequency 4.2GHz environs load electromagnetism crust substantially subtracts
Little, relative bandwidth is 22.2%.And the relative bandwidth of the electromagnetism crust structure of the proposition such as Per-Simon Kildal is
14.3%.
The present invention electromagnetism crust structure compare Per-Simon Kildal proposition electromagnetism crust structure should
For reducing during metal cylinder volume scattering, thickness is thinner, and bandwidth increases.
Claims (3)
1. a kind of electromagnetism crust structure for being applied to metal cylinder, by metal patch layer, magnetic medium layer is constituted；Magnetic is situated between
Matter layer is completely covered metal patch layer bottom, and thickness is d, and width is l, and length is h；Metal patch layer is by width apart for g's
Rectangular metal paster is arranged in order composition along magnetic medium layer long side direction, and metal patch width is w, and length is l, and its material is
High conductivity metal, surround along metal patch slice width edge direction during the electromagnetism crust application and loads on metal cylinder side table
Face, the height of metal cylinder is h, and radius is r；
G/w ＜ 0.2, (w+g)/λ0＜ 0.25, λ0=c/f0, l=2 π (r+d), h=n × (w+g) ± g, n >=4, n is positive integer,
λ0For the operation wavelength of incidence wave in free space, c is the light velocity in free space, f0For the work frequency of incidence wave in free space
Rate.
2. the electromagnetism crust structure of metal cylinder is applied to as claimed in claim 1, it is characterised in that：The magnetic medium
The magnetic conductivity of layer used magnetic material is more than 1.
3. the construction method of the electromagnetism crust structure of metal cylinder is applied to as claimed in claim 1：
Step one：A plane electromagnetic crust model of element is set up in Ansoft-HFSS, the model is by three part structures
Into, it is successively from top to bottom metal patch layer, magnetic medium layer, stratum；Metal patch layer is set to perfect electric conductor with stratum,
The cuboid air box that a size is fitted with it, electromagnetism crust list are built on the electromagnetism crust model of element set up
Meta-model is located at the center of air box, and air box height is 16 times of magnetic medium layer, arranges on the top of air cartridge
Floquet Port ports, boundary condition is set to principal and subordinate boundary condition Master/Slave, emulation plane wave reflected phase with
The variation relation of frequency, scanning optimization obtains reflected phase corresponding frequency in zero degree and is located at centre frequency environs
Plane electromagnetic crust structural parameters size；
Step 2：Step one is applied to into ring for the plane electromagnetic crust structural parameters size obtained by centre frequency optimization
In shape electromagnetism crust, the model that metal cylinder loads electromagnetism crust is set up in FEKO, emulated in central frequency range
The Monostatic RCS RCS of the model, because electromagnetism crust loads on metal cylinder surface, so electromagnetism crust
Ground layer segment, the model is not needed to be made up of three parts, from-inner-to-outer is successively metal cylinder, magnetic medium layer, metal is pasted
Lamella；Metal cylinder is perfact conductor with all metal patches in metal patch layer；
Step 3：The metal cylinder body Model of crust is not loaded in establishment step two in FEKO, metal cylinder is ideal
Conductor, the mono- static RCS of the model in the central frequency range that calculation procedure one determines；
Step 4：Electromagnetism crust structure is prepared according to step one to the three parameters designs for obtaining.
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| CN105742814B (en) * | 2016-03-16 | 2018-07-27 | 电子科技大学 | A kind of the artificial electromagnetic pressure release surface and its construction method of the gap structure that cracks |
| FR3058001B1 (en) * | 2016-10-24 | 2021-09-10 | Airbus Group Sas | COATING FOR CONCEALING OBJECTS FROM ELECTROMAGNETIC RADIATION FROM ANTENNAs |
| CN107729630B (en) * | 2017-09-27 | 2021-03-30 | 中国舰船研究设计中心 | Multilayer cylindrical surface broadband single-station scattering shaping optimization method based on binomial expansion |
Citations (2)
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|---|---|---|---|---|
| CN201450116U (en) * | 2009-07-01 | 2010-05-05 | 东南大学 | Lens antenna with wide frequency band, high gain and good directionality |
| CN102204008A (en) * | 2008-08-22 | 2011-09-28 | 杜克大学 | Metamaterials for surfaces and waveguides |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102204008A (en) * | 2008-08-22 | 2011-09-28 | 杜克大学 | Metamaterials for surfaces and waveguides |
| CN201450116U (en) * | 2009-07-01 | 2010-05-05 | 东南大学 | Lens antenna with wide frequency band, high gain and good directionality |
Non-Patent Citations (3)
| Title |
|---|
| Artificial magnetic conductors realised by frequency-selective surfaces on a grounded dielectric slab for antenna applications;M.A. Hiranandani, A.B. Yakovlev and A.A. Kishk;《IEE Proc.-Microw. Antennas Propag》;20061031(第5期);第487-493页 * |
| Metamaterials 技术及其天线应用综述;刘涛，曹祥玉，张广，文曦;《***工程与电子技术》;20071231;第29卷(第12期);第2192-9196页 * |
| Study on the Scattering Properties of an Arti¯cial Electromagnetic Hard Surface;Xingxing Huang, Peiheng Zhou, Haiyan Chen, Mangui Han等;《PIERS Proceedings, Guangzhou, China》;20140828;第2458-2461页 * |
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