CN107727946A - Tighten field device in a kind of single reflection face of high cross polarization isolation - Google Patents
Tighten field device in a kind of single reflection face of high cross polarization isolation Download PDFInfo
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- CN107727946A CN107727946A CN201711089854.1A CN201711089854A CN107727946A CN 107727946 A CN107727946 A CN 107727946A CN 201711089854 A CN201711089854 A CN 201711089854A CN 107727946 A CN107727946 A CN 107727946A
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- 238000005388 cross polarization Methods 0.000 title claims abstract description 33
- 238000002955 isolation Methods 0.000 title claims abstract description 24
- 230000010287 polarization Effects 0.000 claims abstract description 64
- 238000013461 design Methods 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 238000009434 installation Methods 0.000 claims description 4
- 239000011358 absorbing material Substances 0.000 claims description 2
- 238000003780 insertion Methods 0.000 abstract description 4
- 230000037431 insertion Effects 0.000 abstract description 4
- 230000000903 blocking effect Effects 0.000 abstract description 3
- 238000009826 distribution Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000035508 accumulation Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000005405 multipole Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/10—Radiation diagrams of antennas
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- General Physics & Mathematics (AREA)
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Abstract
The invention discloses a kind of single reflection face of high cross polarization isolation to tighten field device, and the device is mainly made up of the reflecting surface of single reflection face Compact Range, feed and polarization grid.The accurate reflecting surface of feed irradiation single reflection face Compact Range, is plane wave by spheric wave front collimation.Offset feed structure is used on geometric layout to reduce blocking for feed, and offset-fed layout is the main reason for forming larger cross polarization.Arrangement polarization grid, carry out polarization to dead zone field and filter out and gate before the plane wave dead zone of single reflection face Compact Range, and the wherein polarized state of feed and the grid that polarize is controlled by respective controller.The gated gating of polarization of the present invention has the characteristics of wideband operation, can be to the polarization components parallel to polarization grid silk thread close to fully reflective, to the polarization components perpendicular to polarization grid silk thread close to wholly transmissive, to introduce the polarization isolation that the cost high degree of minimum Insertion Loss lifts single reflection face Compact Range.The present invention improves the engineering realizability of Compact Range system design, and is advantageous to the dynamic range of lifting control radio system.
Description
Technical field
The present invention relates to the technical field that field device is tightened in single reflection face, more particularly to a kind of list of high cross polarization isolation
Reflecting surface Compact Range, it is mainly used in the polarization isolation of lifting single reflection face Compact Range, improves cross polarization isolated antennas
Measurement accuracy, and reduce the design and manufacture difficulty for tightening field system, be particularly suitable for application as the accurate survey of THz wave band antennas
Examination hall.
Background technology
With the development of THz technologies, the demand of accurate measurement THz large aperture antennas is increasingly urgent, especially satellite communication
There is higher requirement to cross polarization isolation with complete polarization remote sensing antenna.The Compact Range of traditional high cross polarization isolation, generally
Using the equivalent focal length or big burnt footpath of dual or multi reflection surface system than design, or the compensation of such as feedforward card match Glenn Compact Range is set
Meter, reduce the cross polarization that offset feed structure and feed itself introduce.The focal length design of dual or multi reflection surface system, is advantageously reduced
Primary reflection surface curvature and the cross polarization for suppressing collimated reflected field, but THz wave bands Compact Range cascades according to multiple reflection plane system
Combination, will increase each reflector precision there will be reflecting surface error accumulations at different levels, under equal accuracy requirement causes Project Realization to be deposited
In complexity.In addition, space loss caused by the wave divergence of feed sphere is larger in focal length design system, measuring system can be reduced
Dynamic range.And dead zone relative reflection device aperture position caused by focal length design is farther out, it is unfavorable for lifting the reduction of bore electric size
When frequency it is relatively low when quiet zone performance.Polarization grid single reflection face proposed by the present invention tightens field energy and overcomes disadvantage mentioned above, possesses
More technological merit, more suitable for applied to THz wave bands.
The content of the invention
It is an object of the invention to：It is proposed that field device is tightened in a kind of single reflection face of high cross polarization isolation, pass through and configure
The polarization grid of large aperture suppress the cross polarization in offset-fed single reflection face Compact Range dead zone, and keep single reflection face to tighten field structure
Traditional advantages that are compact and being easy to manufacture, polarization grid have filtered out the polarization components parallel to grid silk thread, gated perpendicular to grid silk
The polarization components of line.The line footpath of grid that polarizes and line spacing are the Sub-Wavelength Design much smaller than wavelength, can be operated in wider frequency band.
The present invention adopts the following technical scheme that to reach foregoing invention purpose：
Field device is tightened in a kind of single reflection face of high cross polarization isolation, and the device is mainly by the anti-of single reflection face Compact Range
Penetrate face, feed and polarization aperture plate composition；The accurate reflecting surface of feed irradiation single reflection face Compact Range, by spheric wave front collimation
For plane wave；Arrangement polarization grid, carry out polarization to dead zone field and filter out or gate before the plane wave dead zone of single reflection face Compact Range,
The wherein polarization strobe state of feed and the grid that polarize is controlled by respective controller.
Wherein, the Compact Range of described high cross polarization isolation is laid out using single reflection face, has compact-sized simple phase
To being easy to manufacture, the THz wave band checkout areas being had higher requirements to the accuracy of manufacture are suitably applied.
Wherein, the relatively small short focus design in burnt footpath, is advantageous to lift single reflection face Compact Range full frequency band performance and survey
Measure the dynamic range of instrument system.
Wherein, the polarization grid bearing of the described gating that is used to polarize is adjustable, is not limited to when adjusting polarization grid bearing electronic
Or control is realized manually.
Wherein, the polarization grid of the described gating that is used to polarize, bandwidth of operation can exceed that 10 octaves, be not limited to certain specific work
Make frequency range.
Wherein, the edge treated of the reflecting surface of described single reflection face deflation field system is not limited to specific curling or saw
Tooth, to suppress interference of the edge diffraction to dead zone.
Wherein, the installation environment of described single reflection face deflation field system is not limited to whether install the microwave of absorbing material
Darkroom or microwave camera bellows.
The principle of the present invention is as follows：
Technical principle of the present invention based on polarization grid and single reflection face Compact Range, by the grid that polarize to orthogonally polarized component
Gating control is filtered out with realizing to single reflection face Compact Range dead zone edge compared with high cross polarization, according to single reflection face Compact Range knot
The characteristics of structure is compact, manufacture is relatively easy, can lift the width phase flatness and polarization purity of dead zone quasi-plane wave, be advantageous to improve
The measuring accuracy of antenna or RCS.
First, field subsystem is tightened by single reflection face, forms the quasi-plane wave dead zone of the phases such as constant amplitude, usual reflecting surface side
To control interference of the edge diffraction to dead zone, lifting improves the flatness of dead zone field for edge sawtooth or curling processing；
Secondly, by the grid subsystem that polarizes, the strobe state of polarization grid is set, handed over spreading into the field before dead zone
Polarization filtration reflection processing is pitched, lifts the polarization purity of dead zone field；
Again, the reflecting surface of usual single reflection face Compact Range and polarization grid are ultra-wide band structure, if system operating frequency becomes
Change has exceeded standard bandwidth, changes suitable feed to keep the optimal irradiation to Compact Range reflecting surface.
The present invention compared with prior art the advantages of be：
(1) present invention improves the polarization purity that field system is tightened in single reflection face, and single offset-fed irradiates reflecting surface in dead zone
Effectively filtered out caused by edge compared with high cross polarization component, polarization grid can improve the polarization isolation of lifting on engineering significance
It at least can exceed that 30dB.
(2) single reflection face Compact Range of the invention and polarization grid, it is easy to system manufacturing tolerance to allow and accuracy guarantee, engineering
It is realisation higher.
(3) focal length of single reflection face Compact Range is shorter than the focal length of multiple reflection plane system, feed space attenuation phase in the present invention
To the smaller dynamic range for being advantageous to improve THz measuring systems, and single reflection face Compact Range dead zone lengthwise position is apart from reflector
Mouth face closer to be also beneficial to suppress edge diffraction.
Brief description of the drawings
Fig. 1 is the total system layout of high cross polarization isolation single reflection face Compact Range；
Fig. 2 is placed in polarization grid and close up fragmentary before dead zone；
Fig. 3 is the close up fragmentary that polarization grid silk thread has a variety of errors (silk thread radius, silk thread spacing and grid line flatness)；
Fig. 4 is the main polarization amplitude distribution of dead zone central horizontal line of single reflection face Compact Range；
Fig. 5 is the main polarization phase distribution of dead zone central horizontal line of single reflection face Compact Range；
Fig. 6 is the dead zone central horizontal line cross polarization amplitude distribution of single reflection face Compact Range；
Fig. 7 is the main polarization amplitude distribution of dead zone central vertical line of single reflection face Compact Range；
Fig. 8 is the main polarization phase distribution of dead zone central vertical line of single reflection face Compact Range；
Fig. 9 is the dead zone central vertical line cross polarization amplitude distribution of single reflection face Compact Range.
Reference implication is in figure：
In Fig. 1：1 is the reflecting surface of single reflection face Compact Range, and 2 be feed, and 3 be polarization grid, and 4 be the dead zone of Compact Range.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment further illustrates the present invention.
The present invention relates to a kind of single reflection face of high cross polarization isolation to tighten field device, and the Compact Range is mainly by single reflection
Reflecting surface, feed, polarization grid, feed polarized state controller, the gated state controller of polarization of face Compact Range.Feed irradiates
The precision rotation parabola of single reflection face Compact Range, it is plane wave by spheric wave front collimation.The Compact Range in single reflection face
Arrangement polarization grid, carry out polarization to dead zone field and filter out or gate before plane wave dead zone, wherein the polarized state of feed and the grid that polarize
Controlled by respective controller.The single reflection face of the invention tightens field device and is not required for being installed in microwave dark room or camera bellows, especially
It is in THz wave bands.
Wherein, described single reflection face Compact Range, the single paraboloid of revolution structure irradiated for feed offset-fed, using empty summit
Design avoids feed from blocking ray, by paraboloidal geometric optics meaning etc. wave-path collimation, can compared with
The directrix plane wave field of the phases such as constant amplitude is formed in wide frequency band range.
Wherein, the usual specially treated in edge of single reflection face Compact Range reflecting surface, suppress in physical optics meaning edge around
The interference to dead zone is penetrated, is not limited to jagged edges or crimped edge, crimped edge processing in theory can produce better quality
Full frequency band dead-space characteristic, it can especially lift performance of the bore less than the electric smallization Compact Range of 10 times of wavelength.
Wherein, described polarization grid gating system, the line footpath and line spacing of the grid silk thread that polarizes are much smaller than minimum operating wave
Long sub-wavelength structure, wideband operation, the replacing of polarized state it can be not limited to electric or hand control in broad frequency band
Realize.
Wherein, described polarization grid gating system, before dead zone after feed, keep not to feed direct irradiation
Reflecting surface blocks, and filters out the cross polar component into before dead zone.
Wherein, the dead zone of described single reflection face Compact Range is the quasi-plane wave place of the phases such as constant amplitude, and passes through the grid that polarize
Gating forms extremely low cross polarization level, to accurate measurement antenna or other Devices to tests.
Wherein, field system is tightened in described single reflection face, recommends but do not limit to be installed in microwave dark room or camera bellows environment,
Form more preferably electromagnetic environment.
A preferred embodiment of the present invention：
Tighten the total system schematic layout pattern of field device, reflection in the single reflection face of high cross polarization isolation as shown in Figure 1
Face size：1000mm × 1000m, focal length 1000mm, empty summit raise 52mm to avoid feed from blocking dead zone, reflecting face edge
Using curling processing, edge entity ratio is controlled 5 to suppress influence of the edge diffraction to dead zone:5.Dead zone is away from reflecting surface lower edge
The distance on summit is 1500mm.In the range of frequency 40GHz~240GHz, analyzed using multilevel fast multipole algorithm and calculate mouth
The near-field thermal radiation dead zone field in footpath, the amplitude (dB) on dead zone central horizontal line and vertical curve, phase as shown in Fig. 4~Fig. 9
(degree) and cross polarization are distributed.According to industry requirement typical case dead zone index, the workable more low frequency of the example can be extended to
3GHz, it can guarantee that high-frequency work can be significantly larger than 240GHz on Theoretical Design, the reflector RMS precision of actual performance requirement is better than
1/100 minimal wave length, it is better than 6 microns dependent on Precision Machinery Design and manufacturing capacity, such as type face RMS precision, highest work frequency
Rate is i.e. up to 500GHz.
Spherical wave as shown in Figure 1, that the feed 2 of single reflection face Compact Range is sent, through as the single anti-of collimating reflectors
The crimping reflecting surface 1 for penetrating face Compact Range is corrected to the plane wave front of the phases such as constant amplitude, but is blocked to solve feed, using offset-fed cloth
Office, introduces cross polarization, and as shown in Fig. 6 and Fig. 9, especially Fig. 6 is eventually in the intersection at the horizontal edge in dead zone (at+250mm)
Polarization is only than main polarization about low 22dB.Placement polarization grid 3 at the forward position of dead zone in Fig. 1, in the dead zone 4 of single reflection face Compact Range
Gate main polarization component and filter out cross polar component.
Polarization grid as shown in Figure 2, the silk thread winding installation positioning of polarization grid are fixed on frame.Grid wire diameter in example
25 microns, 50 microns of line spacing, the random manufacturing tolerance of wire diameter presence+5% in practice, line spacing presence+10%
There is 10 microns of non-ideal random deviation in random manufacturing tolerance, installation frame flatness, as shown in Figure 3.50GHz~
Polarize the Insertion Loss by polarization components of grid and isolating for reflecting polarised component in the range of 500GHz, as shown in table 1.
The segregation table of the Insertion Loss and reflecting polarised component by polarization components of the polarization grid of table 1
Field device is tightened in the single reflection face for the high cross polarization isolation that present example provides, and working frequency can cover 3GHz
~500GHz, the insertion loss by polarization components that polarization grid introduce are less than 0.2dB, the isolation of the reflecting polarised component of introducing
Degree lifting is more than 30dB, can improve the cross polarization of single reflection face Compact Range edge and be much better than 52dB.
What the present invention did not elaborated partly belongs to techniques well known.
Claims (7)
1. field device is tightened in a kind of single reflection face of high cross polarization isolation, it is characterised in that：The device is mainly by single reflection face
Reflecting surface, feed and the polarization grid composition of Compact Range；The accurate reflecting surface of feed irradiation single reflection face Compact Range, by spheric wave front
Collimation is plane wave；Arrangement polarization grid, polarization filter is carried out to dead zone field before the plane wave dead zone of single reflection face Compact Range
Remove or gate, the wherein polarization strobe state of feed and the grid that polarize is controlled by respective controller.
2. field device is tightened in a kind of single reflection face of high cross polarization isolation as claimed in claim 1, it is characterised in that：It is described
Compact Range be laid out using single reflection face, have compact-sized simple relatively simple to manufacture, be suitably applied has to the accuracy of manufacture
The THz wave band checkout areas of high requirement.
3. field device is tightened in a kind of single reflection face of high cross polarization isolation as claimed in claim 1, it is characterised in that：Jiao Jing
Relatively small short focus design, be advantageous to be lifted the dynamic range of Compact Range full frequency band performance and measuring instrumentss system.
4. field device is tightened in a kind of single reflection face of high cross polarization isolation as claimed in claim 1, it is characterised in that：It is described
Be used for polarize gating polarization grid silk thread direction it is adjustable, adjustment polarization grid silk thread direction when be not limited to electric or hand control
Realize.
5. field device is tightened in a kind of single reflection face of high cross polarization isolation as claimed in claim 1, it is characterised in that：It is described
Be used for the polarization grid of gating of polarizing, bandwidth of operation can exceed that 10 octaves, is not limited to certain particular job frequency range.
6. field device is tightened in a kind of single reflection face of high cross polarization isolation as claimed in claim 1, it is characterised in that：It is described
The edge treated of the single reflection face reflecting surface that tightens field system be not limited to specific curling or sawtooth, to suppress edge diffraction
Interference to dead zone.
7. field device is tightened in a kind of single reflection face of high cross polarization isolation as claimed in claim 1, it is characterised in that：It is described
Single reflection face tighten the installation environment of field system and be not limited to whether install the microwave dark room or microwave camera bellows of absorbing material.
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| CN201711089854.1A CN107727946A (en) | 2017-11-08 | 2017-11-08 | Tighten field device in a kind of single reflection face of high cross polarization isolation |
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| CN201711089854.1A CN107727946A (en) | 2017-11-08 | 2017-11-08 | Tighten field device in a kind of single reflection face of high cross polarization isolation |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108879104A (en) * | 2018-06-01 | 2018-11-23 | 北京航空航天大学 | A kind of accurate adjusting mechanism adjusted for the support of Compact Range split Reflector Panel |
| CN111208359A (en) * | 2020-02-06 | 2020-05-29 | 北京环境特性研究所 | Compact range reflecting surface side tooth and design method |
| CN111879238A (en) * | 2020-07-31 | 2020-11-03 | 北京环境特性研究所 | Device and method for rapidly adjusting size of terahertz time-domain spectroscopy measurement quiet zone |
| CN112147423A (en) * | 2020-08-24 | 2020-12-29 | 西安空间无线电技术研究所 | Method for testing polarization isolation of metal wire grating |
| CN112859030A (en) * | 2021-02-02 | 2021-05-28 | 北京邮电大学 | Radar stray radiation RCS measurement system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108879104A (en) * | 2018-06-01 | 2018-11-23 | 北京航空航天大学 | A kind of accurate adjusting mechanism adjusted for the support of Compact Range split Reflector Panel |
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| CN111879238A (en) * | 2020-07-31 | 2020-11-03 | 北京环境特性研究所 | Device and method for rapidly adjusting size of terahertz time-domain spectroscopy measurement quiet zone |
| CN112147423A (en) * | 2020-08-24 | 2020-12-29 | 西安空间无线电技术研究所 | Method for testing polarization isolation of metal wire grating |
| CN112147423B (en) * | 2020-08-24 | 2024-04-09 | 西安空间无线电技术研究所 | Method for testing polarization isolation of metal wire grid |
| CN112859030A (en) * | 2021-02-02 | 2021-05-28 | 北京邮电大学 | Radar stray radiation RCS measurement system |
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Application publication date: 20180223 |