CN102820552B - A kind of broadband circular polarizer and antenna system - Google Patents
A kind of broadband circular polarizer and antenna system Download PDFInfo
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- CN102820552B CN102820552B CN201210268607.9A CN201210268607A CN102820552B CN 102820552 B CN102820552 B CN 102820552B CN 201210268607 A CN201210268607 A CN 201210268607A CN 102820552 B CN102820552 B CN 102820552B
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Abstract
The present invention discloses a kind of broadband circular polarizer, and it comprises multi-layer substrate, and between adjacent base material, the cycle is placed with multiple man-made microstructure to form multilayer man-made microstructure layer, and described man-made microstructure is rectangular metal sheet; The man-made microstructure topological structure of individual layer man-made microstructure layer and measure-alike, along Electromagnetic Wave Propagation direction, reduces after the rectangular metal chip size of different layers man-made microstructure layer increases to maximum gradually gradually.The present invention designs broadband circular polarizer by utilizing meta-material principle, and this broadband circular polarizer structure is simple, can reach extraordinary circular polarization effect in 30-40GHZ.The present invention simultaneously also reduces gradually after man-made microstructure size being increased gradually along Electromagnetic Wave Propagation direction again, meets the requirement of Electromagnetic Wave Propagation impedance matching, reduces reflection of electromagnetic wave, increases gain.
Description
Technical field
The present invention relates to a kind of circular polarizer, particularly relate to a kind of broadband circular polarizer and antenna system.
Background technology
Along with the development of Modern Satellite communication, remote control, telemetry, single polarization can not meet the requirement of Modern Satellite communication far away.The interference of the anti-cloud of circular polarization wave energy, rain, snow, can show very large advantage at Ka and higher wave band.In electronic countermeasures, various linear polarization and the elliptically polarized electromagnetic wave of enemy can be investigated and disturb to circularly polarised wave; Device circular polarized antenna on the violent aircraft swung or roll, can also can captured information under rugged environment, and therefore circularly polarised wave is widely used in astronomy, space communication, remote sensing equipment.
Existing circularly polarised wave producing method comprises design and directly can produce the feed of circularly polarised wave or produce circularly polarised wave by the design shape of paster antenna and the distance etc. of paster antenna and feed.Aforesaid way design is complicated and circularly polarised wave frequency band that is that produce is narrower.
Summary of the invention
Technical problem to be solved by this invention is, for the above-mentioned deficiency of prior art, proposes the broadband circular polarizer that a kind of structure is simple, circular polarization effect is better, frequency band is wider.
The technical scheme that the present invention solves the employing of its technical problem is, a kind of broadband circular polarizer is proposed, it comprises multi-layer substrate, and between adjacent base material, the cycle is placed with multiple man-made microstructure to form multilayer man-made microstructure layer, and described man-made microstructure is rectangular metal sheet; The man-made microstructure topological structure of individual layer man-made microstructure layer and measure-alike, along Electromagnetic Wave Propagation direction, reduces after the rectangular metal chip size of different layers man-made microstructure layer increases to maximum gradually gradually.
Further, sheet metal centered by the rectangular metal sheet that size is maximum, the man-made microstructure apart from central metal sheet same distance has identical size.
Further, described rectangular metal sheet width is identical, along Electromagnetic Wave Propagation direction, reduces gradually after described rectangular metal leaf length increases to maximum gradually.
Further, the mode that described rectangular metal leaf length increases with equal difference increases to maximum gradually.
Further, the axis of described multiple man-made microstructure overlaps.
Further, described broadband circular polarizer comprises nine layers of base material, and described rectangular metal sheet minimum length is 0.9 millimeter, and described rectangular metal sheet maximum length is 1.2 millimeters; Width is 0.2 millimeter.
Further, described rectangular metal sheet thickness is 0.01 to 0.02 millimeter, and described base material thickness is 0.1 to 0.3 millimeter.
Further, described base material is FR-4 material, F4B material, PS material, ferroelectric material, ferromagnetic material, ferrite material or ceramic material.
Further, described substrate dielectric constant is 3.4 to 4.0 at 34-35GHZ.
The present invention also provides a kind of antenna system, and it comprises feed and is arranged at the above-mentioned broadband circular polarizer on described feed radiated electromagnetic wave transmission path.
The present invention designs broadband circular polarizer by utilizing meta-material principle, and this broadband circular polarizer structure is simple, can reach extraordinary circular polarization effect in 30-40GHZ.The present invention simultaneously also reduces gradually after man-made microstructure size being increased gradually along Electromagnetic Wave Propagation direction again, meets the requirement of Electromagnetic Wave Propagation impedance matching, reduces reflection of electromagnetic wave, increases gain.
Accompanying drawing explanation
Fig. 1 is the perspective view of the elementary cell forming Meta Materials;
Fig. 2 is the structural representation of the elementary cell of broadband circular polarizer one of the present invention preferred embodiment;
Fig. 3 is the structural representation of ground floor rectangular metal sheet cycle arrangement in Fig. 2;
Fig. 4 is the axial ratio simulation result schematic diagram of broadband circular polarizer of the present invention;
Fig. 5 is the axial ratio simulation result schematic diagram of 33GHZ frequency in Fig. 4;
Fig. 6 is the axial ratio simulation result schematic diagram of 34GHZ frequency in Fig. 4.
Embodiment
Light, as electromagnetic one, it is when passing glass, because the wavelength of light is much larger than the size of atom, therefore can use the univers parameter of glass, such as refractive index, instead of the response of glass to light is described the details parameter of the atom of composition glass.Accordingly, when research material is to other electromagnetic responses, in material, any yardstick also can with the univers parameter of material to electromagnetic response much smaller than the structure of electromagnetic wavelength, and such as DIELECTRIC CONSTANT ε and magnetic permeability μ describe.The structure often put by designing material is made the dielectric constant of material each point and magnetic permeability all identical or different thus makes the dielectric constant of material monolithic and magnetic permeability be certain rule arrangement, magnetic permeability and the dielectric constant of rule arrangement can make material have response macroscopically to electromagnetic wave, such as, converge electromagnetic wave, divergent electromagnetic ripple etc.The material of such magnetic permeability and dielectric constant with rule arrangement is referred to as Meta Materials.
As shown in Figure 1, Fig. 1 is the perspective view of the elementary cell forming Meta Materials.The elementary cell of Meta Materials comprises the base material 1 of man-made microstructure 2 and the attachment of this man-made microstructure.In the present invention, man-made microstructure is artificial metal micro structure, artificial metal's micro-structural has and can produce the plane of response or three-dimensional topological structure to incident electromagnetic wave electric field and/or magnetic field, and the pattern and/or the size that change the artificial metal's micro-structural in each Meta Materials elementary cell can change each Meta Materials elementary cell to the response of incident electromagnetic wave.In a preferred embodiment, man-made microstructure 2 also can be coated with cover layer 3, cover layer 3, man-made microstructure 2 and base material 1 form the elementary cell of Meta Materials.Multiple Meta Materials elementary cell arranges according to certain rules and Meta Materials can be made to have the response of macroscopic view to electromagnetic wave.Due to Meta Materials overall need to incident electromagnetic wave have macroscopical electromagnetic response therefore each Meta Materials elementary cell need form continuous response to the response of incident electromagnetic wave, this requires that the size of each Meta Materials elementary cell is less than 1/5th of incident electromagnetic wave wavelength, is preferably 1/10th of incident electromagnetic wave wavelength.During this section describes, artificial is divided into multiple Meta Materials elementary cell by Meta Materials entirety, but should know that this kind of division methods is only for convenience of description, Meta Materials both can be spliced by multiple Meta Materials elementary cell or assemble, also artificial metal's micro-structural cycle can be arranged on base material and can form, technique is simple and with low cost.Namely cycle arrangement refers to that the artificial metal's micro-structural in each Meta Materials elementary cell of above-mentioned artificial division can produce continuous print electromagnetic response to incident electromagnetic wave.
Namely the present invention utilizes above-mentioned meta-material principle, and cycle arrangement rectangular metal sheet forms multiple metamaterial sheet by design multi-layer substrate and between adjacent substrate, thus changes the polarization mode of incident electromagnetic wave into circular polarization.In addition in order to reduce incoming electromagnetic wave reflection, meeting impedance matching requirements, along Electromagnetic Wave Propagation direction, reducing gradually after the first increase gradually of size of rectangular metal sheet.
In the present invention, rectangular metal sheet itself can be equivalent to the inductance value in equivalent electric circuit, forms accumulation between adjacent and relative rectangular metal sheet, can be equivalent to the capacitance in equivalent electric circuit.By changing the size of rectangular metal sheet, base material thickness, substrate material can change equivalent inductance and equivalent capacitance value, thus can control electromagnetic wave propagation characteristic.
Please refer to Fig. 2, Fig. 3, Fig. 2 is the structural representation of the elementary cell of broadband circular polarizer one of the present invention preferred embodiment, and Fig. 3 is the structural representation of ground floor rectangular metal sheet cycle arrangement in Fig. 2.For more clearly demonstrating structure, Fig. 2 adopts perspective to attempt.In Fig. 2, broadband circular polarizer comprises nine layers of base material altogether, and nine layers of base material therebetween hold eight layers of man-made microstructure layer.The topology of every layer of man-made microstructure is rectangular metal sheet and the central axes of each man-made microstructure.The topology of individual layer man-made microstructure and measure-alike.The rectangular metal chip size of different layers reduces gradually after the first increase gradually in Electromagnetic Wave Propagation direction.Preferably, sheet metal centered by the rectangular metal sheet that size is maximum, the man-made microstructure apart from central metal sheet same distance has identical size.
In the present embodiment, layer 5 rectangular metal chip size is maximum, centered by sheet metal, then the 4th layer of rectangular metal sheet and layer 6 rectangular metal sheet measure-alike, third layer rectangular metal sheet and layer 7 rectangular metal sheet measure-alike, second layer rectangular metal sheet and the 8th layer of rectangular metal sheet measure-alike.Can imagine ground, broadband circular polarizer of the present invention is according to its corresponding electromagnetic wave frequency range difference and the man-made microstructure layer that can comprise other numbers of plies to the demand precision difference of impedance matching performance.
Further, in the present embodiment, the width of each rectangular metal sheet is identical, only length variations, and length variations rule is equal difference change.Can imagine ground, the Changing Pattern of length is also other Changing Pattern, such as geometric ratio change, index variation etc.In addition, it is constant that the change in size of rectangular metal sheet also can be length, and change width or length and width all change.
In the present embodiment, ground floor rectangular metal sheet is that equal difference increases to the length dimension increase rule of layer 5 rectangular metal sheet.Minimum length is of a size of 0.9 millimeter, and maximum length is of a size of 1.2 millimeters; Width dimensions is 0.2 millimeter.Above-mentioned size can according to required response wave frequency and different from the different demand of impedance matching performance.
In the present embodiment, the thickness of rectangular metal sheet is 0.01 to 0.02 millimeter, and base material thickness is 0.1 to 0.3 millimeter, and broadband circular polarizer general thickness is only 2 to 3 millimeters, can be conveniently used on all kinds of feed.
Base material can adopt FR-4 material, F4B material, PS material, ferroelectric material, ferrite material, ferromagnetic material etc.Preferably, the dielectric constant of substrate material is 3.4 to 4.0 when 34-35GHZ.Rectangular metal sheet can be copper, aluminum, all kinds of conducting metal such as silver.
Please refer to Fig. 4, Fig. 5, Fig. 6, Fig. 4 is the axial ratio simulation result schematic diagram of broadband circular polarizer of the present invention.Fig. 5 and Fig. 6 is the axial ratio simulation result schematic diagram of 33GHZ frequency and 34GHZ frequency in Fig. 4.As can be seen from Figure 4, broadband circular polarizer of the present invention is in 30 to 40GHZ axial ratio all at below 3.5dB, and namely broadband circular polarizer of the present invention all can realize circular polarization effect in 30 to 40GHZ frequency range.From Fig. 5 and Fig. 6, broadband circular polarizer of the present invention, at the circular polarization excellent of 33GHZ and 34GHZ frequency, is only about 0.8dB in 33GHZ axial ratio, and is only 0.74dB in 34GHZ axial ratio.
The present invention also provides a kind of antenna system, and it comprises feed and above-mentioned broadband circular polarizer.Feed can be all kinds of feeds of existing energy radiated electromagnetic wave, such as horn antenna, paster antenna, microstrip antenna etc.Broadband circular polarizer is positioned on feed electromagnetic radiation wave path, and the electromagnetic wave of feed radiation is converted to circular polarization electromagnetic wave.Because broadband circular polarizer thickness is thin, polarization effect is good and meet impedance matching demand, without the need to changing the original structure of feed and taking up room little.
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; do not departing under the ambit that present inventive concept and claim protect, also can make a lot of form, these all belong within protection of the present invention.
Claims (9)
1. a broadband circular polarizer, is characterized in that: comprise multi-layer substrate, and between adjacent base material, the cycle is placed with multiple man-made microstructure to form multilayer man-made microstructure layer, and described man-made microstructure is rectangular metal sheet; The man-made microstructure topological structure of individual layer man-made microstructure layer and measure-alike, along Electromagnetic Wave Propagation direction, reduce gradually after the rectangular metal chip size of different layers man-made microstructure layer increases to maximum gradually, wherein, sheet metal centered by the rectangular metal sheet that size is maximum, the man-made microstructure apart from central metal sheet same distance has identical size.
2. broadband circular polarizer as claimed in claim 1, is characterized in that: described rectangular metal sheet width is identical, along Electromagnetic Wave Propagation direction, reduces gradually after described rectangular metal leaf length increases to maximum gradually.
3. broadband circular polarizer as claimed in claim 2, is characterized in that: the mode that described rectangular metal leaf length increases with equal difference increases to maximum gradually.
4. broadband circular polarizer as claimed in claim 1, is characterized in that: the axis of described multiple man-made microstructure overlaps.
5. broadband circular polarizer as claimed in claim 3, it is characterized in that: described broadband circular polarizer comprises nine layers of base material, described rectangular metal sheet minimum length is 0.9 millimeter, and described rectangular metal sheet maximum length is 1.2 millimeters; Width is 0.2 millimeter.
6. broadband circular polarizer as claimed in claim 5, is characterized in that: described rectangular metal sheet thickness is 0.01 to 0.02 millimeter, and described base material thickness is 0.1 to 0.3 millimeter.
7. broadband circular polarizer as claimed in claim 1, is characterized in that: described base material is FR-4 material, F4B material, PS material, ferroelectric material, ferromagnetic material, ferrite material or ceramic material.
8. broadband circular polarizer as claimed in claim 1, is characterized in that: described substrate dielectric constant is 3.4 to 4.0 at 34-35GHZ.
9. an antenna system, is characterized in that: comprise feed and be arranged at the broadband circular polarizer on described feed radiated electromagnetic wave transmission path, and described broadband circular polarizer is the broadband circular polarizer described in claim 1 to any one of claim 8.
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| CN201210268607.9A CN102820552B (en) | 2012-07-31 | 2012-07-31 | A kind of broadband circular polarizer and antenna system |
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| CN201210268607.9A CN102820552B (en) | 2012-07-31 | 2012-07-31 | A kind of broadband circular polarizer and antenna system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104253302A (en) * | 2013-06-28 | 2014-12-31 | 深圳光启创新技术有限公司 | Metamaterial and polarizer |
| CN103682674B (en) * | 2013-11-20 | 2016-04-13 | 许河秀 | A kind of broadband three-dimensional half fish lens antenna system |
| CN105390819B (en) * | 2015-12-14 | 2018-06-26 | 桂林电子科技大学 | A kind of ultra wide band electromagnetism surpasses surface circular polarizer |
| CN105846109B (en) * | 2016-03-31 | 2019-02-26 | 深圳超级数据链技术有限公司 | A kind of Meta Materials and polarizer |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101431171A (en) * | 2008-12-12 | 2009-05-13 | 东南大学 | Polarization conversion method and polarization converter based on artificial electromagnetic material |
| CN102480061A (en) * | 2011-05-18 | 2012-05-30 | 深圳光启高等理工研究院 | Antenna based meta-material and method for generating working wavelengths of meta-material panel |
| CN102480000A (en) * | 2011-03-18 | 2012-05-30 | 深圳光启高等理工研究院 | Impedance matching element |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101431171A (en) * | 2008-12-12 | 2009-05-13 | 东南大学 | Polarization conversion method and polarization converter based on artificial electromagnetic material |
| CN102480000A (en) * | 2011-03-18 | 2012-05-30 | 深圳光启高等理工研究院 | Impedance matching element |
| CN102480061A (en) * | 2011-05-18 | 2012-05-30 | 深圳光启高等理工研究院 | Antenna based meta-material and method for generating working wavelengths of meta-material panel |
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