CN105896100A - Ultra-low sidelobe reflector antenna - Google Patents
Ultra-low sidelobe reflector antenna Download PDFInfo
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- CN105896100A CN105896100A CN201510036123.5A CN201510036123A CN105896100A CN 105896100 A CN105896100 A CN 105896100A CN 201510036123 A CN201510036123 A CN 201510036123A CN 105896100 A CN105896100 A CN 105896100A
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- reflector antenna
- reflecting surface
- assembly
- side lobe
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Abstract
The present invention provides an ultra-low sidelobe reflector antenna for realizing an ultra-low sidelobe and is suitable for wide-angle scanning. The ultra-low sidelobe reflector antenna comprises a reflector component, a feed source component, a feed source mounting seat, and first and second support rods, wherein, the feed source component is connected to the reflector component through the feed source mounting seat and the first and second support rods, the reflector component is a rotationally symmetrical paraboloid, and thus the ultra-low sidelobe reflector antenna is suitable for the mechanical scanning in a large angle range. Accordingly, the present invention provides the ultra-low sidelobe reflector antenna, the ultra-low sidelobe is realized, the ultra-low sidelobe reflector antenna is suitable for large-angle scanning, and the ultra-low sidelobe reflector antenna has the advantages of simple structure, good rigidity and high reliability.
Description
Technical field
The invention belongs to antenna and microwave technical field, relate to aerospace craft antenna technology, in particular it relates to a kind of ultralow pair
Lobe reflector antenna.
Background technology
It will be appreciated that reflector antenna is common space-vehicle antenna form, it is generally used to realize higher gain.Logical in order to improve
Letter quality, it is also desirable to have the performance of Sidelobe；In order to cover bigger angular domain, it is also desirable to have the performance of mechanical beam scanning.
Reflector antenna common form has following five kinds: offset-fed list is anti-, offset-fed double anti-(Gregorian type), just presenting single instead, the most just
Feedback double anti-(Cassegrain type), ring Jiao's type.
Wherein, anti-and offset-fed double anti-(Cassegrian type) the advantage of offset-fed list is Sidelobe, and shortcoming is that envelope size is relatively big, no
It is beneficial to light-weight design, and offset feed structure is unfavorable for that wide-angle scans.The advantage just presenting single transoid is that envelope size is little, favorably
In light-weight design, beneficially wide-angle scanning, but more difficult reduction secondary lobe.
Just presenting double anti-(Gregorian type) and the secondary anti-diameter of this kind of antenna requirement of ring Jiao's type is being more than 7 wavelength, for bore diameter about
For the small aperture antenna of 40 free space wavelengths, shielded area is relatively big, easily causes high secondary lobe.
It addition, also include other forms, such as splash plate antenna etc., have and use substantially lacking of the aspects such as medium, polarization characteristic difference
Point.
Currently, the spaceborne Ka wave band machinery of domestic employing offset-fed double antistructure design can move beam antenna, beam scanning scope one
As be about ± 10 °, secondary lobe is-20dB.Use the spaceborne Ka wave band machinery just presenting double antistructure design can move beam antenna,
Beam scanning scope is typically up to ± 90 °, and secondary lobe is-15dB.The spaceborne S-band machinery just presenting single antistructure design is used to move
Beam antenna, beam scanning scope, typically up to ± 90 °, owing to have employed back-reflection helical antenna as feed, does not has support bar
Blocking, secondary lobe is-25dB, but this feed is only applicable to the relatively low-frequency range of such as S-band, is not suitable for such as Ka wave band
Higher frequency band.Use the spaceborne Ka wave band machinery just presenting single antistructure design can move beam antenna, prop up owing to feed must use
Strut supports, and causes and blocks, and secondary lobe is-15dB.
Therefore, it is badly in need of a kind of scheme, it is possible to reduce and reflecting surface is blocked, and beneficially higher frequency band such as Ka wave band is anti-
Penetrate surface antenna and reduce minor level.
Summary of the invention
In order to solve problems of the prior art, the present invention proposes the scheme of a kind of ultralow side lobe reflector antenna, is used for
In the higher frequency band of such as Ka frequency range, it is achieved a kind of secondary lobe reaches the ultralow side lobe reflector antenna of-30dB, the most also has
It is applicable to ± the feature of 90 ° of wide-angel beam scannings.
The present invention proposes a kind of ultralow side lobe reflector antenna, is used for realizing ultralow side lobe and being applicable to wide-angle scanning, including:
Reflecting surface assembly, feed assembly, feed mounting seat and the first and second support bars, wherein, feed assembly is pacified by feed
Dress seat and the first and second support bars are connected with reflecting surface assembly, and reflecting surface assembly is rotationally symmetrical parabola, thus
The mechanical scanning being applicable in polarizers of big angle scope.
The rotationally symmetrical parabola of reflecting surface assembly has focus, summit, focal axis and bore contour line, wherein, bore profile
Line is circular, and focal axis is perpendicular through the center of circle of bore contour line.Feed assembly has phase center, beam main axis, feedback
Electric waveguide and feed, wherein, phase center is installed in rotationally symmetrical paraboloidal focus, and beam main axis is with rotationally symmetrical
Paraboloidal focal axis overlaps, and feed and feed waveguide are the structures of integration.
The exposure mask of feed assembly has wedge, to improve electromagnetic radiation, thus advantageously reduces minor level, wherein, and feedback
Electric waveguide is provided with wedge towards the side of reflecting surface assembly.Wedge is isosceles triangle, wherein, and the bottom side length of isosceles triangle
Spend equal and concordant with the narrow limit outside dimension of feed waveguide, and the wavelength that a height of operating frequency is in free space.
Preferably, phase center overlaps with focus, limits requirement meeting the first target offset along the axial deviation of described Jiao,
And beam main axis overlaps with focal axis, both axialities meet the second target offset and limit requirement.
The bore of feed is little, blocks reflecting surface assembly to reduce, thus advantageously reduces minor level.First and second
Strut and feed waveguide provide the structure to feed assembly to support jointly, thus have applicable mechanics rigidity.First and second
The installation site of strut avoids the central area of reflecting surface assembly, blocks reflecting surface assembly to reduce, thus is conducive to fall
Low-sidelobe level.
Extraly, can also include according to the ultralow side lobe reflector antenna of the present invention: feed mounting seat interface, for by feed
Assembly is arranged in feed mounting seat, and the first and second support bar mount points, is used for installing described first and second support bars.
Therefore, ultralow side lobe reflector antenna proposed by the invention, it is achieved that ultralow side lobe, be applicable to wide-angle scanning, with
Time there is simple in construction, good rigidity, high reliability.
Accompanying drawing explanation
Fig. 1 is the outline drawing of the ultralow side lobe reflector antenna according to the present invention；
Fig. 2 is the details title figure of the reflecting surface assembly involved by the specific embodiment of the invention；
Fig. 3 is the details title figure of the feed assembly involved by the specific embodiment of the invention；
Fig. 4 is the outline drawing of the feed mounting seat involved by the specific embodiment of the invention；And
Fig. 5 is the cross sectional representation of the wedge involved by the specific embodiment of the invention.
Detailed description of the invention
It will be appreciated that the ultralow side lobe reflector antenna of the present invention is by reflecting surface assembly, feed assembly, feed mounting seat, support bar
Composition.Reflecting surface assembly is rotationally symmetrical parabola, it is adaptable to the mechanical scanning in polarizers of big angle scope.The phase center peace of feed
Being contained in parabolic focus, the beam main axis of feed overlaps with parabola focal axis.The exposure mask of feed has wedge, is used for changing
Its electromagnetic scattering kind, advantageously reduces minor level.The installation site of support bar avoids reflecting surface central area, and it is right to decrease
Blocking of reflecting surface, advantageously reduces minor level, and has the feature of mechanics good rigidity.One proposed by the invention surpasses
Low Sidelobe Reflector Antenna, achieves ultralow side lobe in the higher frequency band of such as Ka frequency range, is applicable to wide-angle scanning, with
Time there is simple in construction, good rigidity, high reliability.
Wherein, be made up of reflecting surface assembly, feed assembly, feed mounting seat, support bar, feed assembly by feed mounting seat,
Support bar is connected with reflecting surface assembly.Reflecting surface assembly has focus, summit, focal axis, bore contour line, and bore contour line is
Circle, and focal axis is perpendicular through the center of circle of bore contour line.
Feed assembly has phase center, beam main axis, feed waveguide, feed, and phase center overlaps with focus, along described
Burnt axial deviation meets certain deviation and limits requirement, and beam main axis overlaps with focal axis, and both axialities meet certain deviation
Limit requirement.Feed waveguide exposure mask has wedge, is used for improving its electromagnetic scattering, and support bar, support bar avoid simultaneously
Reflecting surface assembly central area, decreases and blocks reflecting surface group, advantageously reduce minor level.Feed bore is little, reduces
Reflecting surface assembly blocked, advantageously reduces minor level.Support bar feed waveguide together provides the knot to feed assembly
The function that structure supports, and there is the feature of mechanics good rigidity.
The present invention is described in detail for 1-5 and detailed description of the invention below in conjunction with the accompanying drawings.
Note, the ultralow side lobe reflector antenna of the present invention, belong to and just present single anti-type.As it is shown in figure 1, ultralow side lobe reflection
Surface antenna is made up of reflecting surface assembly 1, feed assembly 2, feed mounting seat the 4, first support bar the 3, second support bar 24.
As in figure 2 it is shown, reflecting surface assembly 1 is the reflector of reflector antenna, having parabola 19, parabola 19 has Jiao
Axle 5, summit 6, focus 7.Focal axis 5 was exactly summit 6 and the straight line of focus 7.The distance of summit 6 and focus 7 is referred to as anti-
Penetrate the focal length of face assembly.Reflecting surface assembly 1 has bore face 20, for being perpendicular to the plane of focal axis 5, and bore face 20 and indent
The intersection on surface 19 is bore contour line 21, is that the center of circle falls the circle in focal axis 5, and its diameter is referred to as the mouth of reflecting surface assembly
Footpath.Reflecting surface assembly 1 is the rotational symmetry structure with focal axis 5 as axis of symmetry, and axis of symmetry crosses the center of circle in bore face 20, this knot
Structure is referred to as just presenting reflecting surface, is advantageously implemented ± 90 ° of wide-angel beam scannings.
As it is shown on figure 3, feed assembly 2 has feed 22 and feed waveguide 14, both are integral structures.Feed 22 has
Phase center 12, beam main axis 13.Feed assembly 2 with the position relationship of reflecting surface assembly 1 is: beam main axis 13 and focal axis
5 overlap, and phase center 12 overlaps with focus 7.Feed waveguide 14 is i.e. used as microwave transmission passage, also serves as supporting construction,
Feed waveguide 14 is provided with wedge 15 towards the side of reflecting surface assembly 1, for improving the electromagnetic scattering of feed waveguide 14, favorably
In reducing minor level.
Strong point one end of first support bar the 3, second support bar 24 be positioned at reflecting surface assembly 1 the first support bar mount point 10,
In second support bar mount point 25, the other end is positioned in the 3rd support bar mount point 19 of feed assembly 2, avoids reflecting surface
Central area, decreases and blocks reflecting surface, advantageously reduces minor level.
It will be appreciated that to realize a kind of close-coupled waveguide junction, specifically it is considered as from realizing following aspects:
1, electricity design constraint
1) determine bore (being designated as D): according to antenna gain (being designated as G, unit is dBi) to be realized, estimate bore D
Size, both relations are:
Wherein, η is the radiation efficiency of reflector antenna, is typically taken as 50%, and λ is operation wavelength.
2) focal length (being designated as F) is determined: generally use burnt footpath ratio (F/D) and retrain focal length.For reducing the chi along focal axis 5 direction
Very little, and obtain good radiation efficiency, burnt footpath ratio is taken as 0.3～0.4 (being typically taken as 0.35).
3) determine that feed 22 irradiates half angle (being designated as A): with the relation of burnt footpath ratio be:
When burnt footpath ratio is taken as 0.35, there is A ≈ 71.1 °.
4) feed 22 irradiation taper in angle A is determined.Reduce and irradiate taper numerical value, advantageously reduce antenna side lobe, but also
Antenna gain can be caused to decline, it is therefore desirable to choose a moderate numerical value, for realizing ultralow side lobe, typically be taken as-15dB.
5) when the polarization mode of feed 22 is linear polarization, for reducing secondary lobe further, E field polarization direction and feed waveguide 14 should be made
Vertically.When polarization mode is circular polarisation, without particular/special requirement.
6) by emulation or test, the position of phase center 12 is determined.According to the position of phase center 12, and reflecting surface
The structural parameters of assembly 1, determine the overall dimensions of feed waveguide.
7) feed waveguide 14 is standard rectangular waveguide, and its long limit, short side dimension meet national standard or for set according to operating frequency
Fixed value.Feed waveguide bending part is without arc transition.
8) size of wedge 15, isosceles triangle base length limit narrow with feed waveguide outside dimension is equal and concordant, isosceles triangle
Height be about operating frequency wavelength in free space.
9) size of flange 18 is standard waveguide flange size or special interface size.
2, mechanical interface design
1) on reflecting surface assembly 1, following mechanical interface it is provided with:
Reflecting surface mounting interface 8, for being installed on servo control mechanism ultralow side lobe reflector antenna；
First feed mounting seat interface 9, for being arranged on reflecting surface assembly 1 feed mounting seat 4；
First support bar mount point the 10, second support bar mount point 25, for installing first support bar the 3, second support bar
24；And
Prism square mounting interface 11, is used for installing prism square, and prism square is the reference mirror for demarcating focal axis 5.
2) on feed assembly 2, following mechanical interface it is provided with:
Second feed mounting seat interface 17, for being arranged on feed mounting seat 4 feed assembly 2.
3rd support bar mount point 19, for installing first support bar the 3, second support bar 24.
3, the constraints of assembling
First, feed assembly 2 is arranged in feed mounting seat 4, then feed mounting seat 4 and feed assembly 2 is arranged on
On reflecting surface assembly 1, by precision measurement equipment, parabola 19 is carried out and least square fitting, determines reflecting surface assembly
The focal axis 5 of 1 and focus 7, then by precision measurement equipment, measure the deviation of phase center 12 and focus 7, control this deviation
Within certain permissible range, the most again by precision measurement equipment, measure the axiality of beam main axis 13 and focal axis 5, control
This axiality, within certain permissible range, then by measures such as fine setting pads, makes feed mounting seat 4 and reflecting surface assembly 1
Complete to install and fix, finally, 2 support bars 3,24 are installed successively respectively to the first support bar mount point 10 and the second support bar
Mount point 17, must not be with erection stress during installation.
In sum, use the present invention ultralow side lobe reflector antenna, it is achieved that ultralow side lobe, be applicable to wide-angle scanning,
There is simple in construction, good rigidity, high reliability simultaneously.
Undeclared in the present invention partly belong to techniques known.
Claims (10)
1. a ultralow side lobe reflector antenna, is used for realizing ultralow side lobe and being applicable to wide-angle scanning, it is characterised in that
Including: reflecting surface assembly, feed assembly, feed mounting seat and the first and second support bars,
Wherein,
Described feed assembly is connected with described reflecting surface assembly by described feed mounting seat and described first and second support bars
Connect, and
Described reflecting surface assembly is rotationally symmetrical parabola, thus the mechanical scanning being applicable in polarizers of big angle scope.
Ultralow side lobe reflector antenna the most according to claim 1, it is characterised in that described reflecting surface assembly described
Rotationally symmetrical parabola has focus, summit, focal axis and bore contour line,
Wherein, described bore contour line is circular, and described focal axis is perpendicular through the center of circle of described bore contour line.
Ultralow side lobe reflector antenna the most according to claim 2, it is characterised in that described feed assembly has phase place
Center, beam main axis, feed waveguide and feed,
Wherein,
Described phase center is installed in described rotationally symmetrical paraboloidal described focus,
Described beam main axis overlaps with described rotationally symmetrical paraboloidal described focal axis, and
Described feed and described feed waveguide are the structures of integration.
Ultralow side lobe reflector antenna the most according to claim 3, it is characterised in that the exposure of described feed assembly
Mask has wedge, to improve electromagnetic radiation, thus advantageously reduces minor level,
Wherein, described feed waveguide is provided with described wedge towards the side of described reflecting surface assembly.
Ultralow side lobe reflector antenna the most according to claim 4, it is characterised in that described wedge is isosceles triangle
,
Wherein, the base length of described isosceles triangle is equal and concordant with the narrow limit outside dimension of described feed waveguide, Yi Jigao
For operating frequency wavelength in free space.
Ultralow side lobe reflector antenna the most according to claim 3, it is characterised in that
Described phase center overlaps with described focus, wants meeting the first target offset restriction along the axial deviation of described Jiao
Ask, and
Described beam main axis overlaps with described focal axis, and both axialities meet the second target offset and limit requirement.
Ultralow side lobe reflector antenna the most according to claim 3, it is characterised in that the bore of described feed is little, with
Reduce and described reflecting surface assembly is blocked, thus advantageously reduce minor level.
Ultralow side lobe reflector antenna the most according to claim 3, it is characterised in that described first and second support bars
Jointly provide the structure to described feed assembly to support with described feed waveguide, thus there is applicable mechanics rigidity.
Ultralow side lobe reflector antenna the most according to claim 1, it is characterised in that
The installation site of described first and second support bars avoids the central area of described reflecting surface assembly, to reduce described
Blocking of reflecting surface assembly, thus advantageously reduce minor level.
Ultralow side lobe reflector antenna the most according to claim 1, it is characterised in that also include:
Feed mounting seat interface, for described feed assembly is arranged on described feed mounting seat, and
First and second support bar mount points, are used for installing described first and second support bars.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510036123.5A CN105896100A (en) | 2015-01-23 | 2015-01-23 | Ultra-low sidelobe reflector antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510036123.5A CN105896100A (en) | 2015-01-23 | 2015-01-23 | Ultra-low sidelobe reflector antenna |
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| Publication Number | Publication Date |
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| CN105896100A true CN105896100A (en) | 2016-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510036123.5A Pending CN105896100A (en) | 2015-01-23 | 2015-01-23 | Ultra-low sidelobe reflector antenna |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112582806A (en) * | 2020-12-23 | 2021-03-30 | 东莞市驰铭精工科技有限公司 | Double-frequency dual-polarization shared parabolic antenna with front and back feed fusion |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5337062A (en) * | 1992-11-18 | 1994-08-09 | Winegard Company | Deployable satellite antenna for use on vehicles |
| CN201355632Y (en) * | 2009-03-06 | 2009-12-02 | 四川省视频电子有限责任公司 | Antenna pitch adjusting rod arranged with angle |
| CN103794885A (en) * | 2014-01-17 | 2014-05-14 | 西安空间无线电技术研究所 | Low sidelobe feed-forward reflector antenna |
-
2015
- 2015-01-23 CN CN201510036123.5A patent/CN105896100A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5337062A (en) * | 1992-11-18 | 1994-08-09 | Winegard Company | Deployable satellite antenna for use on vehicles |
| CN201355632Y (en) * | 2009-03-06 | 2009-12-02 | 四川省视频电子有限责任公司 | Antenna pitch adjusting rod arranged with angle |
| CN103794885A (en) * | 2014-01-17 | 2014-05-14 | 西安空间无线电技术研究所 | Low sidelobe feed-forward reflector antenna |
Non-Patent Citations (1)
| Title |
|---|
| 史雪莹: ""偏置反射面天线的研究"", 《中国优秀硕士学位论文全文数据库（电子期刊）》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112582806A (en) * | 2020-12-23 | 2021-03-30 | 东莞市驰铭精工科技有限公司 | Double-frequency dual-polarization shared parabolic antenna with front and back feed fusion |
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Application publication date: 20160824 |
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