CN105305048A - Wide-angle circularly-polarized super surface antenna - Google Patents
Wide-angle circularly-polarized super surface antenna Download PDFInfo
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- CN105305048A CN105305048A CN201510710926.4A CN201510710926A CN105305048A CN 105305048 A CN105305048 A CN 105305048A CN 201510710926 A CN201510710926 A CN 201510710926A CN 105305048 A CN105305048 A CN 105305048A
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Abstract
The invention provides a wide-angle circularly-polarized super surface antenna comprising a super surface structure and a half-wavelength dipole antenna placed at a certain height right above the super surface structure. The super surface structure is formed by periodically extending super surface units in the x and y directions according to a certain period respectively, and a super surface unit m*n gap-free arrangement structure is formed, wherein m and n are natural numbers greater than or equal to 2. Each super surface unit is composed of a dielectric substrate, a grounding plate arranged on one side of the dielectric substrate, and a double-arrow-shaped metal patch arranged on the other side of the dielectric substrate. According to the invention, circularly-polarized radiation wave can be generated in a space above the dipole antenna, and by changing the sizes of the super surface units and the dipole antenna and the vertical distance between the super surface units and the dipole antenna, the super surface antenna is enabled to work in different frequency bands. The wide-angle circularly-polarized super surface antenna of the invention has a series of advantages of simple structure, easy frequency adjustment, wide circular polarization angle, radar scattering cross section reduction, and the like.
Description
Technical field
The present invention relates to a kind of antenna structure, particularly relate to a kind of wide angle circular polarization and surpass skin antenna structure.
Background technology
Meta Materials normally by having the sub-wavelength elementary cell periodicity of geometry in particular or aperiodically arranging the Novel manual electromagnetic material formed, has the character not available for occurring in nature material.Super surface can be equivalent to two-dimentional Meta Materials, has very strong ability of regulation and control to electromagnetic wave, can realize polarization conversion, the functions such as polarized rotation.Moreover, surface applications will be surpassed in Antenna Design, traditional antenna can be improved at bandwidth of operation, directivity, radiation efficiency, the performance of the many aspects such as gain, thisly can be called super skin antenna by the new antenna that super surface texture and traditional antenna combined together design.The people such as Chung, K. proposed the micro-strip paster antenna of traditional probe feed and square loop shape to surpass surface conjunction in 2011, achieved the raising of paster antenna performance in impedance bandwidth and antenna efficiency etc. simultaneously.This completely new concept of super skin antenna produces since then, and causes the great interest of researcher.
Circular polarized antenna is just widely used in radio frequency identification, radar, WLAN (wireless local area network) because of its stability on Signal reception, in satellite communication and sensor-based system.Traditional circular polarized antenna needs to be designed in the feed part of linear polarized antenna to produce the orthogonal line polarization wave of constant amplitude usually, thus generation circular polarization radiation, this increases not only the design difficulty of circular polarized antenna, whole antenna structure also may be made more complicated.The application of super surface texture can simplify the design of circular polarized antenna.Surpass on the basis of surface texture at above-mentioned square loop shape, someone devises a kind of super surface texture, its unit comprises a diagonal metal band of a rectangular-shaped loops shape metal patch and rectangle inside, is placed on by this super surface texture near source antenna and can converts the line polarization wave of source antenna radiation to circularly polarised wave.Also have research group to utilize orthogonal I shape to surpass surface and realize the conversion of the linear polarization in broadband range to circular polarization.
A series of achievement in research shows to utilize super surface to realize circular polarization, and especially broadband circular polarization is relatively easy, but wide angle circular polarization does not but almost realize.
Summary of the invention
The present invention, by utilizing the combination of super surface texture and traditional half wavelength dipoles sub antenna, designs a kind of wide angle circular polarization and surpasses skin antenna, realizes the function reducing RCS simultaneously.
Technical scheme of the present invention is achieved in that
A kind of wide angle circular polarization surpasses skin antenna, it is characterized in that: comprise super surface texture and be placed on the half wavelength dipoles sub antenna at certain altitude place directly over super surface texture;
Described super surface texture carries out periodic extension by some cycles respectively in x and y direction form by surpassing surface cell, and form the gapless arrangement architecture of super surface cell m × n, wherein m, n are the natural number being more than or equal to 2; Described super surface cell by medium substrate, be arranged on the ground plate on medium substrate face and the metal patch of double-head arrow shape that is arranged on another face of medium substrate forms.
One aspect of the present invention utilizes super surface texture to be reflected by the radiated wave of dipole antenna along-z direction, and changes the polarization mode of reflected wave, converts y line polarization wave to by x line polarization wave; Utilize the distance between dipole antenna and super surface texture on the other hand, between the direct wave that reflected wave and dipole antenna edge+z direction x along+z direction y polarization are polarized, produce the phase difference of 90 °.It is characterized in that: comprise super surface texture and be placed on the half wavelength dipoles sub antenna at certain altitude place directly over super surface texture.
For the constant amplitude quadrature linear polarization ripple that phase difference is 90 °, pure circularly polarised wave can be produced; The super surface texture that the present invention adopts can by the radiated wave near total reflection of dipole antenna along-z direction, can make phase difference between reflected wave and the direct wave of dipole antenna just near 90 ° by the distance between adjustment dipole antenna and super surface texture, and then this super skin antenna can produce the circularly polarised wave of axial ratio close to the very high purity of 0dB under certain frequency, in certain frequency range, produce the circularly polarised wave meeting engine request that axial ratio is less than 3dB, achieve good circular polarization function;
The super surface texture that the present invention adopts can realize the efficient polarization conversion of line polarization wave at C-band (4GHz ~ 8GHz); Moreover, the effective working frequency range realizing polarization conversion due to super surface texture is controlled by the geometric parameter of super surface cell, the size of increase or the super surface cell of reduction can make polarization conversion frequency range to low frequency or high-frequency mobile, so super skin antenna has frequency easily adjust characteristic.The number of the arrangement of super surface cell in x and y direction can be determined flexibly according to working frequency range and super surface cell size.
The present invention can reduce RCS simultaneously, has expanded the range of application that this wide angle circular polarization surpasses skin antenna further, simultaneously for the design of new antenna provides a kind of brand-new thinking and scheme.
The present invention has following beneficial effect:
1. wide angle circular polarization of the present invention surpasses skin antenna, utilizes the polarization conversion character of super surface texture on the one hand, achieves the linear polarization conversion of dipole antenna reflected wave; Utilize the cross polarization of dipole antenna direct wave and reflected wave on the other hand, produce circular polarization radiation ripple at dipole antenna superjacent air space, realize the conversion of linear polarized antenna to circular polarized antenna.This super skin antenna need not design extra feed structure to produce the orthogonal line polarization wave of constant amplitude, simplifies the design process of circular polarized antenna, shortens the design cycle of circular polarized antenna.
2. structure is simple: the present invention includes super surface texture and be placed on the half wavelength dipoles sub antenna directly over super surface texture, super surface texture is directly arranged in a combination by the mode gapless of m × n by mn identical super surface cell, simple structure and easily processing.
3. strong innovation, technology is perspective good: the present invention utilizes the combination of conventional dipole sub antenna and super surface texture, achieve the conversion of linear polarized antenna to circular polarized antenna, effectively can reduce the RCS of structure, strong innovation, have no this type of antenna structure both at home and abroad, expanded the range of application of this circular polarized antenna, there is good technology perspective.
4. circular polarization angle is wide, and performance is good: the present invention can realize circular polarized antenna function in 5.12 ~ 5.53GHz frequency range; At frequency 5.5GHz place, the angular range that on antenna two primary flats, axial ratio is less than 3dB can reach 123 ° (phi=0 °, xz planes) and 90 ° (phi=90 °, yz plane), and circular polarization angle is wide; At centre frequency 5.35GHz place, greatest irradiation axis of orientation is than being 0.25dB, and circular polarization purity is high, and performance is good; The physical dimension of change structure can realize the corresponding function of terahertz wave band equally.
Accompanying drawing illustrates:
Fig. 1 is the 3-D view of super skin antenna;
Fig. 2 (a) is the substrate top structure schematic diagram of super surface cell;
Fig. 2 (b) is the base plate bottom structural representation of super surface cell;
Fig. 3 is the change curve of reflection coefficient about frequency of super surface texture;
Fig. 4 is the S parameter of super skin antenna;
Fig. 5 (a) is that super skin antenna greatest irradiation axis of orientation is than the change curve about frequency;
Fig. 5 (b) is the change curve of axial ratio about theta of super skin antenna two primary flats under 5.5GHz frequency;
Fig. 6 is the contrast of super surface texture and metal plate structure RCS.
Specific embodiments:
Be described in further detail below in conjunction with the enforcement of accompanying drawing to technical scheme:
Embodiment one
As shown in Figure 1, wide angle circular polarization surpasses skin antenna and is made up of two parts.Part I is super surface texture, and it is that foursquare super surface cell takes advantage of the mode gapless of three to be arranged in a combination by three by nine identical cross sections, and the cycle along x and y direction is p=12 millimeter.Super surface cell by medium substrate, be arranged on the ground plate on medium substrate face and the metal patch of double-head arrow shape that is arranged on another face of medium substrate forms.Dielectric substrate thickness h=6 millimeter, ground plate and metal patch thickness are t=0.018 millimeter.Part II is traditional half wavelength dipoles sub antenna, and length L=25 millimeter, is placed on directly over super surface texture, and distance super surface vertical height H=8 millimeter;
Embodiment two
Structure is super surface cell as shown in Figure 2, double-head arrow shaped metal paster is made up of " L " type metal patch of intermetallic metal band and metal band two ends symmetry, and whole metal patch structure to be placed and about two diagonal all symmetries (about super surface cell Central Symmetry) along the diagonal of super surface cell.Metal band length l=10 millimeter, width w=1.2 millimeter, two ends symmetry " L " type metal patch length d=5.7 millimeter, width g=1 millimeter.
Be illustrated in figure 3 the reflection coefficient of super surface texture, can find that C-band same polarization reflection coefficient is all below-15dB, cross polarization reflection coefficient, close to 0dB, achieves high efficiency polarization conversion function.In addition, effective working frequency range that super surface texture realizes polarization conversion is controlled by the geometric parameter of super surface cell, increasing or reducing the size of super surface cell to make polarization conversion frequency range to low frequency or high-frequency mobile, thus super skin antenna has frequency easily adjusts characteristic.
According to embodiment two, utilize electromagnetic simulation software can obtain the return loss characteristic of super skin antenna as shown in Figure 4.Within the scope of the bandwidth of operation 4.89 ~ 5.7GHz of antenna, return loss is all below-10dB.
According to embodiment two, utilize the circular polarization performance that electromagnetic simulation software can obtain as shown in Figure 5.Fig. 5 (a) is depicted as greatest irradiation axis of orientation than the change curve about frequency, and within the scope of 5.12 ~ 5.53GHz, axial ratio is at below 3dB, and this scope is the circular polarization bandwidth of operation of antenna; At centre frequency 5.35GHz place, greatest irradiation axis of orientation is than being 0.25dB, and circular polarization purity is high, and performance is good; The axial ratio that Fig. 5 (b) is super skin antenna two primary flats is about the change curve of theta, at 5.5GHz place, the angular range that on antenna two primary flats, axial ratio is less than 3dB can reach 123 ° of (phi=0 °, xz plane) and 90 ° of (phi=90 °, yz plane), achieve wide angle circular polarization function.
According to embodiment two, utilize the reduction RCS function that electromagnetic simulation software can obtain as shown in Figure 6.The Monostatic RCS in super surface texture and onesize common metal plate structure two kinds of situations is placed by same position place below contrast dipole antenna, within the scope of 5 ~ 6GHz, the RCS of common metal plate structure changes to-18.5dBsm from-19.1dBsm, as shown in phantom in Figure 6, and the RCS of super surface texture changes to-37dBsm from-25dBsm, thus super skin antenna effectively can reduce RCS within the scope of circular polarization working frequency range 5.12 ~ 5.53GHz, and maximum reduction can reach 10.4dB.
Claims (7)
1. wide angle circular polarization surpasses a skin antenna, it is characterized in that: comprise super surface texture and be placed on the half wavelength dipoles sub antenna at certain altitude place directly over super surface texture;
Described super surface texture carries out periodic extension by some cycles respectively in x and y direction form by surpassing surface cell, and form the gapless arrangement architecture of super surface cell m × n, wherein m, n are the natural number being more than or equal to 2; Described super surface cell by medium substrate, be arranged on the ground plate on medium substrate face and the metal patch of double-head arrow shape that is arranged on another face of medium substrate forms.
2. a kind of wide angle circular polarization according to claim 1 surpasses skin antenna, it is characterized in that described super surface cell cross section is for square.
3. a kind of wide angle circular polarization according to claim 1 surpasses skin antenna, it is characterized in that super surface cell is identical in the arrangement cycle in x with y direction.
4. a kind of wide angle circular polarization according to claim 1 surpasses skin antenna, it is characterized in that super surface cell is equal at the number of the arrangement in x and y direction.
5. a kind of wide angle circular polarization according to claim 1 surpasses skin antenna, it is characterized in that: described metal patch is identical with ground plate thickness.
6. a kind of wide angle circular polarization according to claim 1 surpasses skin antenna, it is characterized in that described metal patch is made up of " L " type metal patch of intermetallic metal band and metal band two ends symmetry, in double-head arrow shape, and about super surface cell Central Symmetry.
7. a kind of wide angle circular polarization according to claim 6 surpasses skin antenna, it is characterized in that metal band is positioned on the diagonal of super surface cell.
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| CN201510710926.4A CN105305048B (en) | 2015-10-27 | 2015-10-27 | A kind of super skin antenna of wide angle circular polarisation |
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| CN201510710926.4A CN105305048B (en) | 2015-10-27 | 2015-10-27 | A kind of super skin antenna of wide angle circular polarisation |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106058481A (en) * | 2016-08-12 | 2016-10-26 | 电子科技大学 | Terahertz reflection-type polarization converter based on Z-shaped super surface |
| CN106877003A (en) * | 2017-03-22 | 2017-06-20 | 桂林电子科技大学 | A kind of reflection-type ultra wide band Terahertz polarization restructural circular polarizer |
| CN107134654A (en) * | 2017-04-21 | 2017-09-05 | 南京航空航天大学 | Double-frequency double-circularly-poantenna antenna and its performance implementation method based on the super surface of electromagnetism |
| CN108470987A (en) * | 2018-03-19 | 2018-08-31 | 南京思追特电子科技有限公司 | half-wave conductor array and its construction method |
| CN108963438A (en) * | 2018-07-12 | 2018-12-07 | 西安电子科技大学 | Low radar cross section array antenna based on polarization conversion |
| CN109560373A (en) * | 2018-11-22 | 2019-04-02 | 中国人民解放军空军工程大学 | A kind of reflective array antenna with low RCS characteristic |
| CN109818152A (en) * | 2019-03-18 | 2019-05-28 | 西安电子科技大学 | A kind of line-circular polarisation converter surpassing surface based on resonant cavity |
| CN112886273A (en) * | 2021-01-18 | 2021-06-01 | 中国船舶重工集团公司第七二四研究所 | Terahertz plane transmission array polarization torsion unit |
| CN113690597A (en) * | 2021-08-09 | 2021-11-23 | 国网江苏省电力有限公司镇江供电分公司 | Low-profile broadband circularly polarized antenna based on super surface |
| CN114421143A (en) * | 2021-12-30 | 2022-04-29 | 哈尔滨工业大学（深圳） | Flexible antenna sensor and preparation method thereof |
| WO2022253144A1 (en) * | 2021-06-04 | 2022-12-08 | 华为技术有限公司 | Metasurface unit and design method therefor |
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| CN102479988A (en) * | 2011-03-15 | 2012-05-30 | 深圳光启高等理工研究院 | Metamaterial polarization transformer |
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| CN102479988A (en) * | 2011-03-15 | 2012-05-30 | 深圳光启高等理工研究院 | Metamaterial polarization transformer |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106058481A (en) * | 2016-08-12 | 2016-10-26 | 电子科技大学 | Terahertz reflection-type polarization converter based on Z-shaped super surface |
| CN106058481B (en) * | 2016-08-12 | 2019-02-01 | 电子科技大学 | The reflective polarization converter of Terahertz for surpassing surface based on Z-type |
| CN106877003A (en) * | 2017-03-22 | 2017-06-20 | 桂林电子科技大学 | A kind of reflection-type ultra wide band Terahertz polarization restructural circular polarizer |
| CN107134654A (en) * | 2017-04-21 | 2017-09-05 | 南京航空航天大学 | Double-frequency double-circularly-poantenna antenna and its performance implementation method based on the super surface of electromagnetism |
| WO2019179015A1 (en) * | 2018-03-19 | 2019-09-26 | 南京思追特电子科技有限公司 | Half-wave conductor array and construction method therefor |
| CN108470987A (en) * | 2018-03-19 | 2018-08-31 | 南京思追特电子科技有限公司 | half-wave conductor array and its construction method |
| CN108470987B (en) * | 2018-03-19 | 2024-02-02 | 南京思追特电子科技有限公司 | Half-wave conductor array and construction method thereof |
| CN108963438A (en) * | 2018-07-12 | 2018-12-07 | 西安电子科技大学 | Low radar cross section array antenna based on polarization conversion |
| CN109560373A (en) * | 2018-11-22 | 2019-04-02 | 中国人民解放军空军工程大学 | A kind of reflective array antenna with low RCS characteristic |
| CN109818152A (en) * | 2019-03-18 | 2019-05-28 | 西安电子科技大学 | A kind of line-circular polarisation converter surpassing surface based on resonant cavity |
| CN112886273A (en) * | 2021-01-18 | 2021-06-01 | 中国船舶重工集团公司第七二四研究所 | Terahertz plane transmission array polarization torsion unit |
| CN112886273B (en) * | 2021-01-18 | 2024-01-30 | 中国船舶集团有限公司第七二四研究所 | Terahertz plane transmission array polarization torsion unit |
| WO2022253144A1 (en) * | 2021-06-04 | 2022-12-08 | 华为技术有限公司 | Metasurface unit and design method therefor |
| CN113690597A (en) * | 2021-08-09 | 2021-11-23 | 国网江苏省电力有限公司镇江供电分公司 | Low-profile broadband circularly polarized antenna based on super surface |
| CN113690597B (en) * | 2021-08-09 | 2024-03-26 | 国网江苏省电力有限公司镇江供电分公司 | Low-profile broadband circularly polarized antenna based on super surface |
| CN114421143A (en) * | 2021-12-30 | 2022-04-29 | 哈尔滨工业大学（深圳） | Flexible antenna sensor and preparation method thereof |
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