CN109462017A - A kind of circular polarisation pulse Cassegrain antenna - Google Patents
A kind of circular polarisation pulse Cassegrain antenna Download PDFInfo
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- CN109462017A CN109462017A CN201811249219.XA CN201811249219A CN109462017A CN 109462017 A CN109462017 A CN 109462017A CN 201811249219 A CN201811249219 A CN 201811249219A CN 109462017 A CN109462017 A CN 109462017A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/14—Reflecting surfaces; Equivalent structures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/24—Polarising devices; Polarisation filters
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- Waveguide Aerials (AREA)
- Aerials With Secondary Devices (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention discloses a kind of circular polarisation pulse Cassegrain antennas, assembly device, feed and the feeding network of primary reflection surface and subreflector, connection primary reflection surface and subreflector including coaxial arrangement, the feed is the molding circular polarisation Monopulse feed of integration, circular polarisation Monopulse feed includes the identical circular polarization feed unit of four structures of 2 × 2 arrangements, and the feed port of four circular polarization feed units is connect with feeding network.Feed of the invention is the molding circular polarisation Monopulse feed of integration, does not have to hierarchical block in this way and processes, and be suitable for various frequency ranges, structure is simple, has the characteristics that wideband axis ratio；In addition, the size of this feed can be made very small, circular polarization feed unit bore can less than one wavelength, have the characteristics that miniaturization compared with prior art, and can be used for a variety of antennas, there is stronger adaptability.
Description
Technical field
The present invention relates to field of antenna, more particularly to a kind of circular polarisation pulse Cassegrain antenna.
Background technique
Since the development of World War II monopulse radar technology, monopulse antenna plays important in radar system
Effect.In radar application, array antenna is generally can be used in monopulse antenna, can also use reflecting surface and Monopulse feed
Composition, wherein reflective monopulse antenna have the characteristics that structure simply, high gain receives and is widely applied.
Reflective monopulse antenna can be divided into the forms such as linear polarization, circular polarisation, multipolarization from polarization characteristic, wherein justifying
Polarized wave has very big advantage, because circularly polarised wave can be decomposed into the line polarization wave of two constant amplitudes and 90 degree of phase phase difference,
So circular polarized antenna can receive the signal of any linear polarization, and single circular polarized antenna will not receive rotation direction in contrast
Circularly polarised wave, the especially circular polarized antenna with broadband character have stronger interference performance and anti-interference ability, but also
It plays an important role in radar and the communications field.Reflective circular polarisation Monopulse feed multiselect is electromagnetic horn, and
The long volume of conventional circular polarization horn feed length is big, and sometimes for loaded medium or diaphragm, it is sometimes desirable to which hierarchical block adds
Work, and especially in millimeter wave frequency band, not only volume large assembly difficulty is big for loaded medium or hierarchical block processing, but also assembles
In the process but also antenna error increases, to reduce the overall performance of antenna, and high performance antenna generally requires antenna to have
There is wider bandwidth, it is therefore desirable to a kind of with broadband character and the simple circular polarisation pulse reflecting surface day easy to process of structure
Line.
Summary of the invention
Goal of the invention: the object of the present invention is to provide a kind of circular polarisation pulse Cassegrain antennas, it has wideband axis
The characteristic of ratio, structure is simple, easy to process.
Technical solution: to reach this purpose, the invention adopts the following technical scheme:
Circular polarisation pulse Cassegrain antenna of the present invention, primary reflection surface and secondary reflection including coaxial arrangement
Face, assembly device, feed and the feeding network for connecting primary reflection surface and subreflector, the feed are the molding entelechy of integration
Change Monopulse feed, four structures identical circular polarization feed units of the circular polarisation Monopulse feed including 2 × 2 arrangements, four
The feed port of circular polarization feed unit is connect with feeding network.
Further, the assembly device is detachable.It, can be along being adjusted axially subreflector after assembly device removes in this way
Position, to adjust the performance of antenna.
Further, the circular polarization feed unit includes the circular polarizer and Feed Horn of integrated molding, circular polarizer
Including rectangular waveguide and two slots, two slots be provided at the upper broadside of rectangular waveguide one end respectively and lower broadside at, two slots
Central symmetry, the center are the center for the part that circular polarizer inner cavity connects two slots, and Feed Horn is set to circular polarizer band
Slotted one end, and the horn mouth of Feed Horn does not block slot.
Further, in terms of from circular polarizer to the direction of Feed Horn, the groove location at upper broadside is partial to center left, lower width
Groove location at side is partial to central right.Circular polarization feed unit at this time is right-handed circular polarization feed unit.
Further, in terms of from circular polarizer to the direction of Feed Horn, the groove location at upper broadside is partial to central right, lower width
Groove location at side is partial to center left.Circular polarization feed unit at this time is left-hand circular polarization feed unit.
Further, the horn mouth of the Feed Horn is rectangle, and the shape of slot is adapted with bell-mouthed shape, so that loudspeaker
Mouth does not block slot.
Further, the horn mouth of the Feed Horn is circle, and the shape of slot is adapted with bell-mouthed shape, so that loudspeaker
Mouth does not block slot.
Further, in four circular polarization feed units, the circular polarization feed unit of the first row secondary series is relative to
The circular polarization feed unit of a line first row is rotated by 90 ° to specific direction, and the circular polarization feed unit of the second row secondary series is opposite
It is rotated by 90 ° in the circular polarization feed unit of the first row secondary series to specific direction, the circular polarization feed unit of the second row first row
Circular polarization feed unit relative to the second row secondary series is rotated by 90 ° to specific direction, the circular polarization feed of the first row first row
Unit is rotated by 90 ° relative to the circular polarization feed unit of the second row first row to specific direction.It is presented when to four right-handed circular polarizations
When the feed port constant amplitude and phase of source unit are respectively 0 degree, 90 degree, 0 degree, 90 degree of feeds, Feed wave beam is reflected through pair
Behind face and primary reflection surface secondary reflection, obtain circular polarisation monopulse antenna and wave beam；When to four right-handed circular polarization feed lists
When the feed port constant amplitude and phase of member are respectively 0 degree, 90 degree, 180 degree, 270 degree of feeds, circular polarisation monopulse antenna is obtained
Pitching difference beam；When the feed port constant amplitude to four right-handed circular polarization feed units and phase is respectively 180 degree, 90 degree, 0
When degree, 270 degree of feeds, the horizontal difference beam of circular polarisation monopulse antenna is obtained.When to four left-hand circular polarization feed units
When feed port constant amplitude and phase are respectively 90 degree, 0 degree, 90 degree, 0 degree of feed, Feed wave beam is anti-through subreflector and master
After penetrating face secondary reflection, obtain circular polarisation monopulse antenna and wave beam；When the feed to four left-hand circular polarization feed units
When port constant amplitude and phase are respectively 270 degree, 180 degree, 90 degree, 0 degree of feed, the trim wave of circular polarisation monopulse antenna is obtained
Beam；When the feed port constant amplitude to four left-hand circular polarization feed units and phase be respectively 270 degree, 0 degree, 90 degree, 180 degree it is other
When feed, the horizontal difference beam of circular polarisation monopulse antenna is obtained.
Further, the assembly device includes bracket and mounting ring, the detachably connected subreflector of mounting ring, bracket
One end connects primary reflection surface, and the other end of bracket is linked and packed ring.
The utility model has the advantages that the invention discloses a kind of circular polarisation pulse Cassegrain antennas to have compared with prior art
It is following the utility model has the advantages that
1) feed of the invention is the molding circular polarisation Monopulse feed of integration, does not have to hierarchical block in this way and processes, and
Suitable for various frequency ranges, structure is simple, has the characteristics that wideband axis ratio；In addition, the size of this feed can be made very small, circle
Polarize feed unit bore can less than one wavelength, have the characteristics that minimize compared with prior art, and can be used for a variety of
Antenna has stronger adaptability；
2) present invention forms circular polarisation Monopulse feed by being successively rotated by 90 ° in the same direction to four circular polarization feed units,
Because while single feed unit itself has preferable circular polarization characteristics, but it still remains linear polarization components, to four circles
Polarization feed unit is successively rotated by 90 ° and carries out suitable amplitude and phase excitation to its port, allows the linear polarizations of adjacent cells
Component is synthetically produced circular polarisation, and the master of circular polarisation monopulse antenna and wave beam is made after the identical circularly polarised wave superposition of two kinds of rotation directions
Beam direction has high circular polarisation purity, compared with tradition is only synthetically produced the antenna of circular polarisation by linear polarization, the present invention
With the very wide characteristic of axial ratio bandwidth and higher gain；
3) present invention uses Cassegrain antenna structure, and structure is simple, easy to process, it can be achieved that high-gain stability is strong
Circular polarisation monopulse antenna.
Detailed description of the invention
Fig. 1 is the overall structure figure of antenna in the specific embodiment of the invention；
Fig. 2 is the structure chart of primary reflection surface in the specific embodiment of the invention；
Fig. 3 is the structure chart of subreflector in the specific embodiment of the invention；
Fig. 4 is the structure chart that device is assembled in the specific embodiment of the invention；
Fig. 5 be in the specific embodiment of the invention horn mouth be rectangle right-handed circular polarization feed unit structure chart；
Fig. 5 (a) is overall diagram；
Fig. 5 (b) is broken away view；
Fig. 6 is the circle for using horn mouth to constitute in the specific embodiment of the invention for the right-handed circular polarization feed unit of rectangle
The structure chart of polarization Monopulse feed；
Fig. 7 be in the specific embodiment of the invention horn mouth be rectangle left-hand circular polarization feed unit structure chart；
Fig. 8 is the circle for using horn mouth to constitute in the specific embodiment of the invention for the left-hand circular polarization feed unit of rectangle
The structure chart of polarization Monopulse feed；
Fig. 9 is the structure chart that horn mouth is circular circular polarization feed unit in the specific embodiment of the invention；
Figure 10 is the two-dimensional structure figure of antenna in the specific embodiment of the invention；
Figure 11 is the operating mode signal of right-handed circular polarization pulse Cassegrain antenna in the specific embodiment of the invention
Figure.
Specific embodiment
Present embodiment discloses a kind of circular polarisation pulse Cassegrain antenna, as shown in Fig. 1 and Figure 10, including
The primary reflection surface 1 and subreflector 2 of coaxial arrangement, the assembly device 3 of connection primary reflection surface 1 and subreflector 2, feed 4 and feedback
Electric network 5.Feed 4 is the molding circular polarisation Monopulse feed of integration, and circular polarisation Monopulse feed includes the four of 2 × 2 arrangements
The identical circular polarization feed unit of a structure, the feed port of four circular polarization feed units are connect with feeding network 5.
Primary reflection surface 1 is as shown in Fig. 2, shape is metal paraboloid.Subreflector 2 is as shown in figure 3, anti-for metal hyperboloid
Penetrate face.
As shown in figure 4, assembly device 3 includes bracket 31 and mounting ring 32.Mounting ring 32 is reflected by 33 auxiliary connection of nut
Face 2, nut 33 is detachable, and after nut 33 is removed, the position of mounting ring 32 and subreflector 2 is adjusted.One end of bracket 31
Primary reflection surface 1 is connected by nut 34, the other end of bracket 31 is fixedly connected with mounting ring 32.
Circular polarization feed unit includes the circular polarizer and Feed Horn of integrated molding.The horn mouth of Feed Horn can be with
It is rectangle, is also possible to circle, is described separately below.
1, the horn mouth of Feed Horn is rectangle
Circular polarisation Monopulse feed with rectangular horn mouth includes the identical circular polarisation feedback of four structures of 2 × 2 arrangements
Source unit.Four circular polarization feed units can be right-handed circular polarization feed unit, or left-hand circular polarization feed unit,
It is introduced separately below.
1) when four circular polarization feed units are right-handed circular polarization feed unit, respectively the first right-handed circular polarization feed list
First 41, second right-handed circular polarization feed unit 42, third right-handed circular polarization feed unit 43 and the 4th right-handed circular polarization feed list
Member 44, as shown in Figure 6.It is introduced by taking the structure of the first right-handed circular polarization feed unit 41 as an example below, other three dextrorotation
Circular polarization feed cellular construction is identical as the first right-handed circular polarization feed 41 structures of unit, just repeats no more.Such as Fig. 5 (a) and Fig. 5
(b) shown in, circular polarizer 411 includes rectangular waveguide and two slots 4111, and two slots 4111 are provided with rectangular waveguide one end respectively
Upper broadside at and lower broadside at, two 4111 central symmetries of slot, the center be 411 inner cavity of circular polarizer connect two slots 4111
Part center, Feed Horn 412 is set to one end that circular polarizer 411 has slot 4111, the shape of slot 4111 and feed loudspeaker
412 bell-mouthed shape is adapted, so that horn mouth does not block slot 4111.From circular polarizer to the direction of Feed Horn
It sees, center left is partial in 4111 position of slot at upper broadside, and central right is partial in 4111 position of slot at lower broadside.When electric field exists
Circular polarizer 411 is transferred to the part of slot 4111 by rectangular waveguide, and single linear polarization is passing through two centrosymmetric slots
Multiple electric field patterns can be generated during 4111, twist-reflector occurs for a part of electric field, and electric field passes through Feed Horn 412 again and arrives
Up to feed bore face, for certain structure size, superimposed electric field intensity has preferable circular polarization characteristics.Such as Fig. 6 institute
Show, in four right-handed circular polarization feed units, from circular polarizer 411 to the direction of Feed Horn 412 in terms of, the second right-handed circular polarization
Feed unit 42 rotates clockwise 90 degree relative to the first right-handed circular polarization feed unit 41, third right-handed circular polarization feed unit
43 rotate clockwise 90 degree relative to the second right-handed circular polarization feed unit 42, the 4th right-handed circular polarization feed unit 44 relative to
Third right-handed circular polarization feed unit 43 rotates clockwise 90 degree, and the first right-handed circular polarization feed unit 41 is relative to the 4th dextrorotation
Circular polarization feed unit 44 rotates clockwise 90 degree.When the feed port constant amplitude and phase to four right-handed circular polarization feed units
When respectively 0 degree, 90 degree, 0 degree, 90 degree of feeds, Feed wave beam obtains after 1 secondary reflection of subreflector 2 and primary reflection surface
To circular polarisation monopulse antenna and wave beam；When the feed port constant amplitude to four right-handed circular polarization feed units and phase is distinguished
When for 0 degree, 90 degree, 180 degree, 270 degree of feeds, the pitching difference beam of circular polarisation monopulse antenna is obtained；When to four dextrorotation circles
When the feed port constant amplitude and phase of polarization feed unit are respectively 180 degree, 90 degree, 0 degree, 270 degree of feeds, circular polarisation list is obtained
The horizontal difference beam of pulse antenna.Above-mentioned three kinds of operating modes and the phase value of right-handed circular polarization feed unit feed port are as schemed
Shown in 11.
2) when four circular polarization feed units are left-hand circular polarization feed unit, respectively the first left-hand circular polarization feed list
First 61, second left-hand circular polarization feed unit 62, third left-hand circular polarization feed unit 63 and the 4th left-hand circular polarization feed list
Member 64, as shown in Figure 7 and Figure 8.The structure of left-hand circular polarization feed unit and right-handed circular polarization feed unit only slotted position
Difference, other are all identical.For left-hand circular polarization feed unit, from circular polarizer to the direction of Feed Horn in terms of, at upper broadside
Groove location be partial to central right, the groove location at lower broadside is partial to center left.As shown in figure 8, four left-hand circular polarization feedbacks
In source unit, from circular polarizer to the direction of Feed Horn in terms of, the second left-hand circular polarization feed unit 62 is left-handed relative to first
Circular polarization feed unit 61 is rotated by 90 ° counterclockwise, and third left-hand circular polarization feed unit 63 is presented relative to the second left-hand circular polarization
Source unit 62 is rotated by 90 ° counterclockwise, and the 4th left-hand circular polarization feed unit 64 is relative to third left-hand circular polarization feed unit 63
It is rotated by 90 ° counterclockwise, the first left-hand circular polarization feed unit 61 is relative to the 4th rotation counterclockwise of left-hand circular polarization feed unit 64
It turn 90 degrees.When the feed port constant amplitude to four left-hand circular polarization feed units and phase is respectively 90 degree, 0 degree, 90 degree, 0 degree
When feed, Feed wave beam after subreflector and primary reflection surface secondary reflection, obtain circular polarisation monopulse antenna and wave
Beam；When the feed port constant amplitude to four left-hand circular polarization feed units and phase is respectively 270 degree, 180 degree, 90 degree, 0 degree of feedback
When electric, the pitching difference beam of circular polarisation monopulse antenna is obtained；When the feed port etc. to four left-hand circular polarization feed units
Width and phase be respectively 270 degree, 0 degree, 90 degree, 180 degree is when feeding, obtain the horizontal difference beam of circular polarisation monopulse antenna.
2, the horn mouth of Feed Horn is circle
Circular polarization feed unit 71 with round speaker mouth is as shown in Figure 9.As shown in figure 9, circular polarizer 711 includes square
Shape waveguide and two slots 7111, two slots 7111 be provided at the upper broadside of rectangular waveguide one end respectively and lower broadside at, two
7111 central symmetry of slot, the center are the center for the part that 711 inner cavity of circular polarizer connects two slots 7111, Feed Horn 712
One end of slot 7111 is had set on circular polarizer 711, the shape of slot 7111 is mutually fitted with the bell-mouthed shape of Feed Horn 712
Match, so that horn mouth does not block slot 7111.
Similarly, the circular polarization feed unit with round speaker mouth is also possible to left-handed and dextrorotation and identical before,
Details are not described herein again.
Claims (9)
1. a kind of circular polarisation pulse Cassegrain antenna, primary reflection surface (1) and subreflector (2), company including coaxial arrangement
Connect the assembly device (3), feed (4) and feeding network (5) of primary reflection surface (1) and subreflector (2), it is characterised in that: described
Feed (4) is the molding circular polarisation Monopulse feed of integration, and circular polarisation Monopulse feed includes four structures of 2 × 2 arrangements
Identical circular polarization feed unit, the feed port of four circular polarization feed units are connect with feeding network (5).
2. circular polarisation pulse Cassegrain antenna according to claim 1, it is characterised in that: the assembly device (3)
Detachably.
3. circular polarisation pulse Cassegrain antenna according to claim 1, it is characterised in that: the circular polarization feed list
Member includes the circular polarizer and Feed Horn of integrated molding, and circular polarizer includes rectangular waveguide and two slots, two slot difference
Be provided at the upper broadside of rectangular waveguide one end and lower broadside at, two groove centers are symmetrical, the center be circular polarizer inner cavity
The center of the part of two slots is connected, Feed Horn is set to the slotted one end of circular polarizer band, and the horn mouth of Feed Horn is not
Block slot.
4. circular polarisation pulse Cassegrain antenna according to claim 3, it is characterised in that: from circular polarizer to feed
The direction of loudspeaker sees that the groove location at upper broadside is partial to center left, and the groove location at lower broadside is partial to central right.
5. circular polarisation pulse Cassegrain antenna according to claim 3, it is characterised in that: from circular polarizer to feed
The direction of loudspeaker sees that the groove location at upper broadside is partial to central right, and the groove location at lower broadside is partial to center left.
6. circular polarisation pulse Cassegrain antenna according to claim 3, it is characterised in that: the loudspeaker of the Feed Horn
Mouth is rectangle, and the shape of slot is adapted with bell-mouthed shape, so that horn mouth does not block slot.
7. circular polarisation pulse Cassegrain antenna according to claim 3, it is characterised in that: the loudspeaker of the Feed Horn
Mouth is circle, and the shape of slot is adapted with bell-mouthed shape, so that horn mouth does not block slot.
8. circular polarisation pulse Cassegrain antenna according to claim 4 or 5, it is characterised in that: four entelechies
Change in feed unit, the circular polarization feed unit of the first row secondary series relative to the first row first row circular polarization feed unit to
Specific direction is rotated by 90 °, circular polarization feed list of the circular polarization feed unit of the second row secondary series relative to the first row secondary series
Member is rotated by 90 ° to specific direction, and the circular polarization feed unit of the second row first row is presented relative to the circular polarisation of the second row secondary series
Source unit is rotated by 90 ° to specific direction, entelechy of the circular polarization feed unit of the first row first row relative to the second row first row
Change feed unit to be rotated by 90 ° to specific direction.
9. circular polarisation pulse Cassegrain antenna according to claim 1, it is characterised in that: the assembly device (3)
Including bracket (31) and mounting ring (32), mounting ring (32) detachably connected subreflector (2), one end connection of bracket (31)
Primary reflection surface (1), the other end of bracket (31) are linked and packed ring (32).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811249219.XA CN109462017B (en) | 2018-10-25 | 2018-10-25 | Circularly polarized single-pulse Cassegrain antenna |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811249219.XA CN109462017B (en) | 2018-10-25 | 2018-10-25 | Circularly polarized single-pulse Cassegrain antenna |
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| CN109462017A true CN109462017A (en) | 2019-03-12 |
| CN109462017B CN109462017B (en) | 2020-08-25 |
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| CN201811249219.XA Active CN109462017B (en) | 2018-10-25 | 2018-10-25 | Circularly polarized single-pulse Cassegrain antenna |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112993587A (en) * | 2021-02-03 | 2021-06-18 | 北京邮电大学 | Circularly polarized reflector antenna and communication equipment |
| CN113131210A (en) * | 2021-04-13 | 2021-07-16 | 西北核技术研究所 | Positive-feed Cassegrain antenna for high-power microwave |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112993587A (en) * | 2021-02-03 | 2021-06-18 | 北京邮电大学 | Circularly polarized reflector antenna and communication equipment |
| CN113131210A (en) * | 2021-04-13 | 2021-07-16 | 西北核技术研究所 | Positive-feed Cassegrain antenna for high-power microwave |
| CN113131210B (en) * | 2021-04-13 | 2022-09-06 | 西北核技术研究所 | Positive feed Cassegrain antenna for high-power microwave |
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