CN104505597A - Polarizing separating device for broadband signal of orthogonal off-set feeding parabolic antenna and separating method of polarizing separating device - Google Patents
Polarizing separating device for broadband signal of orthogonal off-set feeding parabolic antenna and separating method of polarizing separating device Download PDFInfo
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Abstract
The invention discloses a polarizing separating device for a broadband signal of an orthogonal off-set feeding parabolic antenna and a separating method of the polarizing separating device and relates to the field of an antenna feeder system. The polarizing separating device comprises a grid, a feed source horn A, a feed source horn B and a parabolic reflecting plane, wherein the grid is inclined for 45 degrees and is arranged between the feed source horn A and the feed source horn B; the feed source horn A and the feed source horn B are mirror symmetrical about each other relative to the grid; a grid reflecting polarizing direction is parallel to an electromagnetic wave of the grid; the electromagnetic wave with the polarizing direction vertical to the grid is permitted to pass through; an atmospheric radiation signal with the polarizing direction parallel to the grid is received by the feed source horn A; the atmospheric radiation signal with the polarizing direction vertical to the grid is received by the feed source horn B. According to the invention, the grid is utilized to perform polarizing separation on the broadband signal, so that the simultaneous reception and polarizing separation for an ultra wideband signal can be realized; the orthogonal off-set feeding antenna has the advantages of wide working frequency band, high polarizing separating degree, low minor lobe level, and the like; a technical support is supplied to a radiometer for normally receiving the atmospheric radiation signal.
Description
Technical field
The present invention relates to antenna transmission system field, particularly relate to a kind of orthogonal offset-fed parabolic antenna broadband signal polarization separation device and separation method thereof.
Background technology
Ground-Based Microwave Radiometer (Microwave Radiometer) is the meteorological observation equipment based on Atmospheric Microwave remote sensing technology.By receiving the radiation signal of V-band aerial oxygen window (51GHz-59GHz) and K-band atmosphere vapour window (22GHz-31GHz) simultaneously, inverting obtains the information such as troposphere atmospheric temperature, moisture profile, large gas column integration vapour quantity, large gas column integration cloud water water content.In order to ensure that the small-signal of atmospheric radiation is effectively received, usually select the parabola antenna feeder with high-gain feature as receiving element.
Conventional Feed Horn irradiates whole parabolic antenna, and the directional diagram of formation is the result that whole antenna reflective face all acts on.Feed Horn bore is amplified, thus make the directional diagram of Feed Horn more sharp-pointed, simultaneously by Feed Horn 90-degree rotation, then Feed Horn emittance is only confined to the MN subregion of female parabolic antenna, then antenna pattern is female parabola MN subregion exercising result, be referred to as orthogonal offset-fed parabolic antenna, as Fig. 1.In the present invention, orthogonal offset-fed parabolic antenna will realize K-band (22-32GHz, perpendicular polarization) and V-band (51-59GHz, horizontal polarization) electromagnetic signal receiving function.Antenna Operation bandwidth is mainly determined by Feed Horn, receives and export while single feed receiving system is difficult to realize broadband signal like this.
Because two frequency range polarised directions of Antenna Operation are mutually orthogonal, work so duplex technology can be utilized on a reflecting surface to realize two frequency ranges simultaneously.Conventional polarization orthogonal device is exactly this device, but polarization orthogonal device frequency band is narrower is generally 20%, so be difficult to be applied to this.
Summary of the invention
For the problems referred to above, the invention provides a kind of orthogonal offset-fed parabolic antenna broadband signal polarization separation device and separation method thereof, this method solve following two problems.(1) ultra-broadband signal cannot be realized in prior art to receive and polarization separation simultaneously; (2), when duplexing grid is used for the polarization separation of broadband signal, grid causes electrical property to worsen to needing the electromagnetic signal be separated to have side effects.
In order to solve the problem, the present invention adopts following technical scheme:
A kind of orthogonal offset-fed parabolic antenna broadband signal polarization separation device, it comprises grid, Feed Horn A, Feed Horn B, parabolic antenna, above-mentioned grid tilts 45 degree and is placed between Feed Horn B and antenna reflective face, and above-mentioned Feed Horn A and Feed Horn B is symmetrical relative to patterned mirror plate.
Further, above-mentioned grid be placed on Feed Horn B the axis of symmetry on and the horizontal range of grid centre-to-centre spacing Feed Horn B is 67mm.
Further, the reflecting polarised direction of above-mentioned grid is parallel to the electromagnetic wave of grid, allow polarised direction pass through perpendicular to the electromagnetic wave of grid, Feed Horn A receiving polarization direction is parallel to the atmospheric radiation signal of grid, and Feed Horn B receiving polarization direction is perpendicular to the atmospheric radiation signal of grid.
Further, K-band polarized signal is parallel to above-mentioned grid, and V-band polarized signal is perpendicular to above-mentioned grid, and Feed Horn A receives K-band atmospheric radiation signal, and Feed Horn B receives V-band atmospheric radiation signal.
Further, the minimum long limit of above-mentioned grid is of a size of 160mm, and minimum narrow limit is of a size of 120mm, and grid wire diameter is 0.1mm, and wire is spaced apart 1.5mm.
A kind of orthogonal offset-fed parabolic antenna broadband signal polarization separation method, being tilted 45 degree to be placed between Feed Horn B and antenna reflective face by grid, is then the plane of symmetry with grid, places Feed Horn A in its specular position.Feed Horn A receiving polarization direction is parallel to the electromagnetic wave of grid, and Feed Horn B receiving polarization direction is perpendicular to the electromagnetic wave of grid.The reflecting polarised direction of above-mentioned grid is parallel to the electromagnetic wave of grid, allows polarised direction pass through perpendicular to the electromagnetic wave of grid.
Further, K-band polarized signal is parallel to above-mentioned grid, and V-band polarized signal is perpendicular to above-mentioned grid, and Feed Horn A receives K-band atmospheric radiation signal, and Feed Horn B receives V-band atmospheric radiation signal.
As shown in Figure 2, the grid of design is reflection for K-band polarized signal, then the K-band polarized signal being positioned at Feed Horn A reception can be equal to the signal received from Feed Horn B.Due to the grid of design to the polarized signal of V-band radiation in through characteristic, Feed Horn B receives V-band polarized signal, thus is separated with V-band polarizations by K-band signal, and final orthogonal offset-fed antenna broadband signal polarization separation device is as shown in Figure 3.
Further, above-mentioned grid makes the polarization being parallel to grid be reflected, and the polarization perpendicular to grid is passed through, just a perfect condition.In fact grid can have side effects, as the insertion loss, reflection efficiency etc. of grid to needing the electromagnetic signal be separated.The electrical property deterioration brought is introduced in order to reduce grid as far as possible, grid wire diameter is selected to be 0.1mm, wire is spaced apart 1.5mm, and the minimum long limit of directional diagram width determination grid according to the K-band loudspeaker of reflection is of a size of 160mm, and minimum narrow limit is of a size of 120mm.
The present invention utilizes the reflecting polarised direction of grid to be parallel to the electromagnetic wave of grid, and the principle allowing polarised direction pass through perpendicular to the electromagnetic wave of grid, carries out polarization separation to broadband signal.The orthogonal offset-fed antenna with this polarization separation device can realize ultra-broadband signal and receive the problem with polarization separation simultaneously, make this kind of orthogonal offset-fed antenna have the advantages such as working frequency range is wide, polarization isolation is high, minor level is low, provide technical guarantee for radiometer normally receives atmospheric radiation signal.
Accompanying drawing explanation
Fig. 1 is the orthogonal offset-fed parabolic antenna structural representation of prior art;
Fig. 2 is that grid speculum of the present invention is as schematic diagram;
Fig. 3 is the present invention's orthogonal offset-fed antenna broadband signal polarization separation device schematic diagram;
Fig. 4 is grid wire schematic diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further elaborated.
Embodiment 1
A kind of orthogonal offset-fed parabolic antenna broadband signal polarization separation device, as shown in Figure 3, it comprises grid, Feed Horn A, Feed Horn B, parabolic reflector, the grid of above-mentioned vertical placement tilts 45 degree and is placed between Feed Horn B and parabolic reflector, above-mentioned Feed Horn A and Feed Horn B is symmetrical relative to patterned mirror plate, on the axis of symmetry that grid is placed on Feed Horn B and the horizontal range of grid centre-to-centre spacing Feed Horn B is 67mm.
Further, the reflecting polarised direction of above-mentioned grid is parallel to the electromagnetic wave of grid, allow polarised direction pass through perpendicular to the electromagnetic wave of grid, Feed Horn A receiving polarization direction is parallel to the atmospheric radiation signal of grid, and Feed Horn B receiving polarization direction is perpendicular to the atmospheric radiation signal of grid.
Further, K-band polarized signal is parallel to above-mentioned grid, and V-band polarized signal is perpendicular to above-mentioned grid, and Feed Horn A receives K-band atmospheric radiation signal, and Feed Horn B receives V-band atmospheric radiation signal.
Further, the minimum long limit of above-mentioned grid is of a size of 160mm, and minimum narrow limit is of a size of 120mm, and grid wire diameter is 0.1mm, and wire is spaced apart 1.5mm.
A kind of orthogonal offset-fed parabolic antenna broadband signal polarization separation method, being tilted 45 degree to be placed between Feed Horn B and antenna reflective face by the grid vertically placed, is then the plane of symmetry with grid, places Feed Horn A in its specular position.Feed Horn A receiving polarization direction is parallel to the electromagnetic wave of grid, and Feed Horn B receiving polarization direction is perpendicular to the electromagnetic wave of grid.The reflecting polarised direction of above-mentioned grid is parallel to the electromagnetic wave of grid, allows polarised direction pass through perpendicular to the electromagnetic wave of grid.
As shown in Figure 2, the grid of design is reflection for K-band polarized signal, then the K-band polarized signal being positioned at Feed Horn A reception can be equal to the signal received from Feed Horn B.Due to the grid of design to the polarized signal of V-band radiation in through characteristic, Feed Horn B receives V-band polarized signal, thus is separated with V-band polarizations by K-band signal, and final orthogonal offset-fed antenna broadband signal polarization separation device is as shown in Figure 3.
Further, above-mentioned grid makes the polarization being parallel to grid be reflected, and the polarization perpendicular to grid is passed through, just a perfect condition.In fact grid can have side effects, as the insertion loss, reflection efficiency etc. of grid to needing the electromagnetic signal be separated.Introducing to reduce grid as far as possible the electrical property deterioration brought, needing to carry out accurately calculating and design to grid size,
First, if grid wire radius is a, spacing is d, and as shown in Figure 4, then except reflecting, leaking through grid energy wiry is:
As can be seen from formula above, spacing d is less, and energy leakage is less, in general at least requires d≤0.2 λ; The larger leakage of wire radius is less, is equivalent to wire joins together and be turned into metallic plate as a=d/2, no doubt best for K-band reflection, but in order to look after V-band transmission performance, chooses a=d/10.
Secondly, the length of grid and width determine according to the directional diagram width of the K-band loudspeaker that will reflect, and as shown in Figure 2, the distance of getting Feed Horn phase center distance grid is L=67mm, the irradiating angle of loudspeaker is θ=24 degree, then the minimum long limit that can calculate grid is of a size of:
The minimum narrow limit of grid is of a size of:
B＝2×Ltgθ
0
Selection principle is when not affecting offset parabola and rotating, and is got by area larger as far as possible.The optimization of CST simulation software is adopted to obtain grid final size: minimum long limit is of a size of A=160mm, and minimum narrow limit is of a size of B=120mm, and grid wire diameter is 0.1mm, and wire is spaced apart 1.5mm.
Table 1 is this orthogonal offset-fed parabolic antenna system testing index summary sheet.Can find out, Feed Horn voltage standing wave ratio, antenna directivity, minor level and cross-polarization levels are functional, are better than routine and are just presenting parabolic antenna system, meet final engineering instructions for use.
Table 1 orthogonal offset-fed parabolic antenna system index summary sheet
In sum, one described in the invention orthogonal offset-fed parabola antenna broadband signal polarization separation device and separation method, effectively can calculate the size value of grid, can well realize the polarization separation of broadband signal.Use the method that orthogonal offset-fed antenna system can be made to have the advantage of broadband, high polarization isolation, low-sidelobe level.
Claims (7)
1. an orthogonal offset-fed parabolic antenna broadband signal polarization separation device, it is characterized in that, comprise grid, Feed Horn A, Feed Horn B, parabolic reflector, described grid tilts 45 degree and is placed between Feed Horn B and parabolic reflector, and described Feed Horn A and Feed Horn B is symmetrical relative to patterned mirror plate.
2. orthogonal offset-fed parabolic antenna broadband signal polarization separation device according to claim 1, is characterized in that, on the axis of symmetry that described grid is placed on Feed Horn B and the horizontal range of grid centre-to-centre spacing Feed Horn B is 67mm.
3. orthogonal offset-fed parabolic antenna broadband signal polarization separation device according to claim 2, it is characterized in that, the reflecting polarised direction of described grid is parallel to the electromagnetic wave of grid, polarised direction is allowed to pass through perpendicular to the electromagnetic wave of grid, Feed Horn A receiving polarization direction is parallel to the atmospheric radiation signal of grid, and Feed Horn B receiving polarization direction is perpendicular to the atmospheric radiation signal of grid.
4. orthogonal offset-fed parabolic antenna broadband signal polarization separation device according to claim 3, it is characterized in that, K-band polarized signal is parallel to described grid, V-band polarized signal is perpendicular to described grid, Feed Horn A receives K-band atmospheric radiation signal, and Feed Horn B receives V-band atmospheric radiation signal.
5. the orthogonal offset-fed parabolic antenna broadband signal polarization separation device according to claim 3 or 4, it is characterized in that, the minimum long limit of described grid is of a size of 160mm, and minimum narrow limit is of a size of 120mm, grid wire diameter is 0.1mm, and wire is spaced apart 1.5mm.
6. an orthogonal offset-fed parabolic antenna broadband signal polarization separation method, it is characterized in that, (1) grid is tilted 45 degree to be placed between Feed Horn B and antenna reflective face, on the axis of symmetry that grid is placed on Feed Horn B and the horizontal range of grid centre-to-centre spacing Feed Horn B is 67mm, then be the plane of symmetry with grid, place Feed Horn A in its specular position; (2) Feed Horn A receiving polarization direction is parallel to the electromagnetic wave of grid, and Feed Horn B receiving polarization direction is perpendicular to the electromagnetic wave of grid; (3) grid is parallel to the polarized signal of grid for reflection to polarised direction, then be positioned at the polarized signal that polarised direction that Feed Horn A receives is parallel to grid and can be equal to the signal received from Feed Horn B, grid to polarised direction perpendicular to the polarized signal of grid radiation in through characteristic, polarised direction perpendicular to the polarized signal of grid, thus is parallel to grid signal and is separated perpendicular to grid polarizations with polarised direction by Feed Horn B receiving polarization direction.
7. orthogonal offset-fed parabolic antenna broadband signal polarization separation method according to claim 6, it is characterized in that, K-band polarized signal is parallel to described grid, and V-band polarized signal is perpendicular to described grid, Feed Horn A receives K-band electromagnetic wave, and Feed Horn B receives V-band electromagnetic wave; The minimum long limit of described grid is of a size of 160mm, and minimum narrow limit is of a size of 120mm, and grid wire diameter is 0.1mm, and wire is spaced apart 1.5mm.
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Cited By (4)
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| CN107064834A (en) * | 2017-05-05 | 2017-08-18 | 北京航空航天大学 | A kind of wideband electromagnetic imaging surface signal acquiring system switched based on light path |
| CN107492720A (en) * | 2017-08-15 | 2017-12-19 | 上海航天测控通信研究所 | A kind of spaceborne nadir is with facing side integrative detection antenna-feedback system and method |
| CN111146572A (en) * | 2019-12-20 | 2020-05-12 | 中国电波传播研究所（中国电子科技集团公司第二十二研究所） | Folding circular polarization reflective array antenna |
| WO2024120312A1 (en) * | 2022-12-06 | 2024-06-13 | 华为技术有限公司 | Full duplex antenna device and communication system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064834A (en) * | 2017-05-05 | 2017-08-18 | 北京航空航天大学 | A kind of wideband electromagnetic imaging surface signal acquiring system switched based on light path |
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| CN107492720A (en) * | 2017-08-15 | 2017-12-19 | 上海航天测控通信研究所 | A kind of spaceborne nadir is with facing side integrative detection antenna-feedback system and method |
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| CN111146572A (en) * | 2019-12-20 | 2020-05-12 | 中国电波传播研究所（中国电子科技集团公司第二十二研究所） | Folding circular polarization reflective array antenna |
| WO2024120312A1 (en) * | 2022-12-06 | 2024-06-13 | 华为技术有限公司 | Full duplex antenna device and communication system |
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Application publication date: 20150408 |