CN102800959B - Antenna system with antenna cover - Google Patents
Antenna system with antenna cover Download PDFInfo
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- CN102800959B CN102800959B CN201110145752.3A CN201110145752A CN102800959B CN 102800959 B CN102800959 B CN 102800959B CN 201110145752 A CN201110145752 A CN 201110145752A CN 102800959 B CN102800959 B CN 102800959B
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Abstract
The invention provides an antenna system with an antenna cover. The antenna system comprises the antenna cover, an antenna positioned in the antenna cover and an antenna bracket for supporting the antenna cover, wherein the antenna cover comprises a metamaterial panel with anisotropism; the metamaterial panel is formed by stacking metamaterial sheet layers; each metamaterial sheet layer comprises a sheet-type substrate and a plurality of artificial micro structures attached to the substrate; each artificial micro structure has a non 90-degree rotary symmetric structure; the extraordinary light axis of the refraction index ellipsoid of each artificial micro structure is not perpendicular to and not parallel to a transmission direction of electromagnetic waves emitted by the antenna; seen from the incidence direction of the electromagnetic waves emitted by the antenna, the refractive indexes of the metamaterial panel are radially symmetric about the central axis of the metamaterial panel; and along with the increase of the radiuses, the refractive indexes are gradually reduced, and the change rate of the refractive indexes is gradually increased. Due to the antenna cover, the antenna can be prevented from being influenced by the external environment; and the antenna system is relatively high in directivity.
Description
Technical field
The present invention relates to a kind of antenna system, relate to a kind of antenna system with radome particularly.
Background technology
Antenna is placed in outdoor work usually, is directly subject to the invasion and attack of occurring in nature storm, ice and snow, sand and dust and solar radiation etc., causes antenna precision reduction, the lost of life and functional reliability to be deteriorated.Radome can protect antenna system from external environment influence.The stability of antenna system can be improved, alleviate the wearing and tearing of antenna system, corrosion and aging, the useful life of extension antenna simultaneously.For the antenna in the aircraft of high-speed flight, radome can also solve the problem that high temperature, airload and other loads bring to antenna.But radome is the barrier before antenna, can produces aerial radiation ripple and absorb and reflection, affect the electric property of antenna to a certain extent.
Meta Materials, as a kind of design of material theory and study frontier, more and more causes the concern of people, so-called Meta Materials, refers to some artificial composite structures with the extraordinary physical property not available for natural material or composite material.By designing in order the physical structure of material, the restriction of some natural material can be broken through, thus obtain the extraordinary performance exceeding the intrinsic common material of nature.
Meta Materials comprise by metal wire form have certain pattern form man-made microstructure and man-made microstructure accompanying by base material, multiple man-made microstructure array arrangement on base material, base material is played a supporting role to man-made microstructure, can be any material different from man-made microstructure.A generation effective dielectric constant and magnetic permeability are in space understood in the superposition of this bi-material, and these two physical parameters distinguish electric field response and the magnetic responsiveness of correspondence material monolithic.
The effective dielectric constant of man-made microstructure and equivalent permeability are determined by the physical dimension parameter of Meta Materials elementary cell, can artificially design and control.Because man-made microstructure can have the electromagnetic parameter of artificial design, thus Meta Materials can produce the phenomenon of many novelties, provides possibility for realizing electromagnetic convergence.
Each man-made microstructure in anisotropic Meta Materials is non-90 degree rotational symmetry structure, does not overlap before namely rotating with micro-structural after arbitrary axle 90-degree rotation in micro-structural, as " I " shape or " I " shape derivative shape as
shape, the extraordinary ray optical axis out of plumb of the index ellipsoid of each man-made microstructure and be not parallel to incoming electromagnetic direction of wave travel.
Summary of the invention
The technical problem to be solved in the present invention is: be easily subject to during the outdoor work of antenna occurring in nature storm, ice and snow, sand and dust and solar radiation invasion and attack cause antenna precision to reduce; and existing radome easily produces to the electromagnetic wave that antenna sends the defect absorbing and reflect; a kind of antenna system with metamaterial antenna cover is provided; this system both can protect antenna not by the interference of external environment condition, and the electromagnetic wave that can send antenna again carries out converging the directivity improving antenna.
The technical solution adopted for the present invention to solve the technical problems is: a kind of antenna system with radome, comprise radome, be positioned at the antenna of radome, and the antenna holder of supporting antenna cover, described radome comprises and has anisotropic metamaterial panel, described metamaterial panel forms by metamaterial sheet is stacking, the substrate that each metamaterial sheet comprises sheet and the multiple man-made microstructure be attached on substrate, each man-made microstructure is non-90 degree rotational symmetry structure, the extraordinary ray optical axis out of plumb of the index ellipsoid of each man-made microstructure and be not parallel to the electromagnetic wave propagation direction that described antenna sends, described metamaterial panel looks over the rate of change of refractive index while that refractive index diminishing gradually relative to the central shaft radial symmetric of described metamaterial panel and along with the increase refractive index of radius along the electromagnetic incident direction that antenna sends and increases gradually.
In a preferred embodiment of the invention, the man-made microstructure of described Meta Materials is arranged relative to described central shaft radial symmetric, a bit on described central shaft is intersected at after extending relative to the extraordinary ray optical axis of the index ellipsoid of the described man-made microstructure of central shaft radial symmetric arrangement, and the extended line of described extraordinary ray optical axis intersects shape in an angle, the electromagnetic wave propagation direction that opening direction and the antenna of described angle send is contrary.
In a preferred embodiment of the invention, described man-made microstructure has identical geometry.
In a preferred embodiment of the invention, described man-made microstructure distributes relative to described central shaft radial symmetric, the size of described man-made microstructure reduces with the reduction of refractive index, and described man-made microstructure reduces gradually along with the size of the described man-made microstructure of increase of radius.
In a preferred embodiment of the invention, same radius and extraordinary ray optical axis along each index ellipsoid of parallel its correspondence of a line man-made microstructure of the axis of described central shaft are parallel to each other.
In a preferred embodiment of the invention, it is measure-alike for same radius and a line man-made microstructure parallel vertically.
In a preferred embodiment of the invention, the plane of incidence of described metamaterial panel and exit facet are provided with impedance matching layer.
In a preferred embodiment of the invention, described man-made microstructure by etching, plating, bore quarters, photoetching, electronics carve or ion quarter be attached on described base material.
In a preferred embodiment of the invention, described man-made microstructure is " I " shape
In a preferred embodiment of the invention, described man-made microstructure is the derivative shape of " I " shape.
Implement antenna system of the present invention, there is following beneficial effect: this antenna system is owing to having radome, antenna can be made from the impact of external environment condition, in addition owing to using anisotropic Meta Materials as radome and being reduced gradually towards periphery by centre by design refractive indices, the directivity of antenna can be improved further; Electromagnetic absorption and reflection that antenna is sent can be reduced additionally by arranging impedance matching layer respectively at the plane of incidence of metamaterial panel and exit facet.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the structure of antenna system;
Fig. 2 is the schematic diagram of the electromagnetic wave that sends of antenna through metamaterial panel;
Fig. 3 is the structural representation of the metamaterial sheet in centre position;
Fig. 4 is that the metamaterial sheet in centre position is to the schematic diagram of the electromagnetic wave convergence that antenna sends;
Fig. 5 is the schematic diagram of the metamaterial sheet variations in refractive index being positioned at centre position;
Fig. 6 is the structural representation of the metamaterial sheet with impedance matching layer.
Embodiment
Describe the present invention below in conjunction with accompanying drawing.
As shown in Figure 1, the antenna system that the present embodiment provides comprises radome 3, be positioned at the antenna 2 of radome, and the antenna holder 4 of supporting antenna cover, radome 3 comprises the anisotropic metamaterial panel 1 with aggregation feature, antenna 2 is positioned in the focus of metamaterial panel 1, focus is positioned on the direction of the central axis of metamaterial panel, as shown in Figure 2, metamaterial panel 1 is superimposed along Z-direction by multiple metamaterial sheet, each metamaterial sheet is made up of with the man-made microstructure be attached on substrate the substrate of sheet, every plate base is divided into multiple identical cube base material unit be mutually close to virtually, these base material unit take X-direction as row, with Y direction vertical with it for leu time array arrangement.The length of side of base material unit be generally incident electromagnetic wave wavelength 1/10 to ten/5th between.Each base material unit is attached with a man-made microstructure, base material unit and the man-made microstructure be attached on base material unit form a metamaterial unit jointly, and metamaterial panel 1 can be regarded as and formed along X, Y, Z tri-direction array arrangements by multiple metamaterial unit.Be positioned at the metamaterial sheet in metamaterial panel centre position as shown in Figure 3, man-made microstructure is " I " shape, comprise two regions up and down that relative centre axle 00 ' is symmetrical, in zones of different, measure-alike along the man-made microstructure in the metamaterial unit of X-direction, upper half area increases gradually along the man-made microstructure size in the metamaterial unit of Y direction, second region reduces gradually along the man-made microstructure size in the metamaterial unit of Y direction, each " I " shape man-made microstructure is non-90 degree rotational symmetry structure, the extraordinary ray optical axis out of plumb of the index ellipsoid of each man-made microstructure and be not parallel to the electromagnetic wave propagation direction that radiating element sends.The refraction index profile rule of this metamaterial sheet as shown in Figure 4 and Figure 5, wherein n11 > n12 > n13 > n14, (n13-n14) > (n12-n13) > (n11-n12), refractive index is directly proportional to the size of micro-structural, the man-made microstructure of metamaterial sheet is relative to central shaft 00 ' symmetry arrangement, the extraordinary ray optical axis of the index ellipsoid that " I " shape man-made microstructure is corresponding is consistent with the direction of " I " shape intermediate connections, a bit on central shaft is intersected at after extending relative to the extraordinary axes of the index ellipsoid of the man-made microstructure of central shaft symmetry arrangement, and described extraordinary ray optical axis extended line intersects shape in an angle, the opening direction of described angle is contrary with incoming electromagnetic direction of wave travel.
Metal micro structure in the metamaterial panel that multiple metamaterial sheet is formed by stacking is arranged relative to central shaft 00 ' radial symmetric, metamaterial panel looks over refractive index along the electromagnetic wave propagation direction that antenna sends identical relative to the refractive index at central shaft OO ' radial symmetric and same radius place, and increases gradually along with diminish the gradually rate of change of refractive index simultaneously of the increase refractive index of radius.It should be noted that, because in fact metamaterial unit is a cube but not a point, the metamaterial unit approximate alignment that therefore refractive index is identical is circular, and more accurately, the metamaterial unit that refractive index is identical is distributed in a zigzag circumferentially.It is that foursquare square cylinder such as Fig. 2 also can intercept the cylinder that the plane of incidence is circle that metamaterial panel can intercept the plane of incidence according to the concrete needs of radome.
In order to reduce the reflection in metamaterial panel 1 of electromagnetic wave that antenna 2 sends and absorption, two faces (the electromagnetic plane of incidence that antenna send and exit facet) of metamaterial panel 1 along X-direction can adhere to an impedance matching layer respectively, as shown in Figure 6, adhere to an impedance matching layer D1 at the electromagnetic plane of incidence, electromagnetic exit facet adheres to impedance matching layer D2.Each impedance matching layer D1 and D2 comprises 4 impedance matching lamellas respectively, the refractive index being attached to the different impedance matching lamellas of the impedance matching layer D1 on the plane of incidence is transitioned into metamaterial panel along refractive index corresponding to X-direction gradually by the refractive index of air, the refractive index being attached to the different impedance matching lamellas of the impedance matching layer D2 on exit facet is transitioned into the refractive index of air gradually by the refractive index of metamaterial panel along X-direction, namely along X-direction, refractive index by air to D1 again to metamaterial panel transition gradually, equally, refractive index by metamaterial panel to D2 again to air transition gradually.
By reference to the accompanying drawings embodiments of the invention are described above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not departing under the ambit that present inventive concept and claim protect, also can make a lot of form, such as man-made microstructure can also be " I " shape derivative shape as
shape etc.These all belong within protection of the present invention.
Claims (9)
1. one kind has the antenna system of radome, comprise radome, be positioned at the antenna of radome, and the antenna holder of supporting antenna cover, it is characterized in that, described radome comprises and has anisotropic metamaterial panel, described metamaterial panel forms by metamaterial sheet is stacking, the substrate that each metamaterial sheet comprises sheet and the multiple man-made microstructure be attached on substrate, each man-made microstructure is non-90 degree rotational symmetry structure, the extraordinary ray optical axis out of plumb of the index ellipsoid of each man-made microstructure and be not parallel to the electromagnetic wave propagation direction that described antenna sends, described metamaterial panel looks over the rate of change of refractive index while that refractive index diminishing gradually relative to the central shaft radial symmetric of described metamaterial panel and along with the increase refractive index of radius along the electromagnetic incident direction that antenna sends and increases gradually,
The electromagnetic incident direction sent along antenna is looked, described man-made microstructure is arranged relative to described central shaft radial symmetric, a bit on described central shaft is intersected at after extending relative to the extraordinary ray optical axis of the index ellipsoid of the described man-made microstructure of central shaft radial symmetric arrangement, and the extended line of described extraordinary ray optical axis intersects shape in an angle, the electromagnetic wave propagation direction that opening direction and the antenna of described angle send is contrary.
2. antenna system according to claim 1, is characterized in that, described man-made microstructure has identical geometry.
3. antenna system according to claim 2, it is characterized in that, described man-made microstructure distributes relative to described central shaft radial symmetric, the size of described man-made microstructure reduces with the reduction of refractive index, and described man-made microstructure reduces gradually along with the size of the described man-made microstructure of increase of radius.
4. antenna system according to claim 3, is characterized in that, same radius and extraordinary ray optical axis along each index ellipsoid of parallel its correspondence of a line man-made microstructure of the axis of described central shaft are parallel to each other.
5. antenna system according to claim 4, is characterized in that, it is measure-alike for same radius and a line man-made microstructure parallel vertically.
6., according to the arbitrary described antenna system of claim 1 to 5, it is characterized in that, the plane of incidence and the exit facet of described metamaterial panel are provided with impedance matching layer.
7. antenna system according to claim 6, is characterized in that, described man-made microstructure by etching, plating, bore quarters, photoetching, electronics carve or ion quarter be attached on described base material.
8. antenna system according to claim 7, is characterized in that, described man-made microstructure is " I " shape.
9. antenna system according to claim 7, is characterized in that, described man-made microstructure is the derivative shape of " I " shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110145752.3A CN102800959B (en) | 2011-06-01 | 2011-06-01 | Antenna system with antenna cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110145752.3A CN102800959B (en) | 2011-06-01 | 2011-06-01 | Antenna system with antenna cover |
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| Publication Number | Publication Date |
|---|---|
| CN102800959A CN102800959A (en) | 2012-11-28 |
| CN102800959B true CN102800959B (en) | 2015-03-04 |
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| CN201110145752.3A Active CN102800959B (en) | 2011-06-01 | 2011-06-01 | Antenna system with antenna cover |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104466386A (en) * | 2014-11-27 | 2015-03-25 | 张永超 | Low-loss metamaterial antenna housing |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101587990A (en) * | 2009-07-01 | 2009-11-25 | 东南大学 | Broad band cylindrical lens antenna based on artificial electromagnetic materials |
| CN101699659A (en) * | 2009-11-04 | 2010-04-28 | 东南大学 | Lens antenna |
| CN101919114A (en) * | 2007-10-11 | 2010-12-15 | 雷斯潘公司 | Single-layer metallization and via-less metamaterial structures |
-
2011
- 2011-06-01 CN CN201110145752.3A patent/CN102800959B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101919114A (en) * | 2007-10-11 | 2010-12-15 | 雷斯潘公司 | Single-layer metallization and via-less metamaterial structures |
| CN101587990A (en) * | 2009-07-01 | 2009-11-25 | 东南大学 | Broad band cylindrical lens antenna based on artificial electromagnetic materials |
| CN101699659A (en) * | 2009-11-04 | 2010-04-28 | 东南大学 | Lens antenna |
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| CN102800959A (en) | 2012-11-28 |
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