CN108923130A - Rotational field reflector antenna based on super surface - Google Patents
Rotational field reflector antenna based on super surface Download PDFInfo
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- CN108923130A CN108923130A CN201810584369.XA CN201810584369A CN108923130A CN 108923130 A CN108923130 A CN 108923130A CN 201810584369 A CN201810584369 A CN 201810584369A CN 108923130 A CN108923130 A CN 108923130A
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- principal reflection
- reflection mirror
- antenna
- phase
- carrier
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
- H01Q19/12—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave
- H01Q19/13—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave the primary radiating source being a single radiating element, e.g. a dipole, a slot, a waveguide termination
- H01Q19/132—Horn reflector antennas; Off-set feeding
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/02—Waveguide horns
-
- 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
- H01Q15/16—Reflecting surfaces; Equivalent structures curved in two dimensions, e.g. paraboloidal
Abstract
The invention discloses a kind of rotational field reflector antenna based on super surface, mainly solve that existing rotational field reflector antenna focal length is big, and antenna integrally takes up space greatly, the big problem of phase compensation error.It includes carrier (1), principal reflection mirror (2), feed (3) and support construction (4), wherein, carrier (1) uses concave structure, principal reflection mirror (2) is concave structure, and it is conformal with carrier, the focal length of principal reflection mirror is less than the geometry focal length of carrier, for realizing short focus effect, the principal reflection mirror includes main dielectric layer (21), principal reflection layer (22) and master phase regulation layer (23), master phase regulates and controls layer by multiple uniform arrangements, and it is formed by the main becket micro-structure (231) of helical form overall distribution, for generating vortex electromagnetic wave, support construction is for fixing feed.The present invention can be shortened the focal length of rotational field reflector antenna, reduces antenna and is integrally taken up space, while reducing phase compensation error, can be used for communication and radar.
Description
Technical field
The invention belongs to antenna technical fields, are related to a kind of rotational field reflector antenna, can be used for communicating and being imaged.
Technical background
Vortex electromagnetic wave can be formed largely because having good orthogonality between its different modalities with frequency multiplex channel, application
The availability of frequency spectrum and message capacity can be greatly improved when the communications field, can satisfy growing traffic capacity demands, because
This becomes the emphasis of people's research.On the other hand, vortex electromagnetic wave due to its own carry consecutive variations angle information, one
A rotational field antenna can be achieved with the multi-angle irradiation to target, so can substitute multiple emission sources pair in SAR imaging field
Same target is detected from different perspectives, to obtain the three-dimensional imaging figure of higher resolution and more preferable signal-to-noise ratio, is significantly subtracted
The cost and complexity of system are lacked, therefore vortex electromagnetic wave has very high potential using value in SAR imaging field.
However after the geometry of paraboloid primary reflection surface determines, antenna focal length can also determine therewith, cannot achieve focal length
It is flexible adjustable, to shorten focal length, then to increase the curvature of paraboloid primary reflection surface, cause the master under same aperture area anti-
The increase of face height is penetrated, more stringent requirements are proposed to antenna processing.
Existing research such as Chinese patent, application publication number are 105552556 A of CN, entitled " orbital angular momentum vortex wave
The invention of beam generation device and method " discloses a kind of orbital angular momentum antenna, including plane primary reflection surface and feed, described
Plane primary reflection surface uses super surface texture, and the electromagnetic wave irradiation generated by feed is after primary reflection surface surpasses surface texture reflection
Generate vortex electromagnetic wave.Though this antenna realizes the excitation of vortex electromagnetic field to a certain extent, since it is planar junction
Structure cannot achieve the function that concave mirror shortens primary reflection surface focal length, and its super surface reflection cellular construction is complicated, negligible amounts,
It cannot achieve the more accurate phase compensation of vortex electromagnetic wave.
Summary of the invention
Present invention aims in view of the deficiency of the prior art, propose that a kind of rotational field based on super surface is anti-
Surface antenna is penetrated, to reduce phase compensation error, simplifies antenna structure, reduces antenna focal length, antenna is saved and is integrally taken up space.
To achieve the above object, the present invention is based on the conformal rotational field reflector antennas in the convex surface on super surface includes：
Carrier 1, principal reflection mirror 2, feed 3 and support construction 4, principal reflection mirror 2 and carrier 1 are conformal, and feed 3 uses pyramid
Electromagnetic horn, support construction 4 is made of four rigid plastics rods, for fixing feed 3；It is characterized in that：
The carrier 1 uses concave structure；
The principal reflection mirror 2 is burnt using the super surface texture in SPA sudden phase anomalies concave surface constructed based on broad sense Snell's law
The height of integrated antenna is reduced, the principal reflection mirror for shortening the focal length of integrated antenna away from the geometry focal length for being less than carrier 1
Regulate and control layer 23 including main dielectric layer 21, principal reflection layer 22 and master phase, and master phase regulation layer 23 is evenly arranged by m × n
Main becket micro-structure 231 forms, and the phase compensation numerical value of each main micro- 231 structure of becket is different, and all main beckets are micro-
Structure 231 presses helical form overall distribution, for generating vortex electromagnetic wave, m >=12, n >=12.
Further, the concave structure that the carrier 1 uses is concavity paraboloid column construction, and along cylindrical surface bus
Vertical direction is bent upwards from center to both sides of the edge, and bending degree defers to the paraboloid equation of opening upwards, and center thickness is small
In edge thickness.
Further, the main dielectric layer 21 is concave structure, and upper surface prints master phase and regulates and controls layer 23, lower surface print
Principal reflection layer 22 processed.
Further, the size of each main becket micro-structure 231 by its position incident electromagnetic wave relative to
The incidence angle θ of principal reflection mirror 2iIt determines, calculates as follows with phase compensation numerical value Φ (x, y, z)：
Wherein d Φ=k (sin θi-sinθr) dr indicate Φ (x, y, z) to the derivative of r, whereinθiFor incoming electromagnetic
Incidence angle of the wave relative to principal reflection mirror 2, θrAngle of reflection for reflection electromagnetic wave relative to principal reflection mirror 2, k are electromagnetic wave biography
Constant is broadcast, f is 2 focal length of principal reflection mirror, and M indicates the mode value that electromagnetism is vortexed, and θ is vortex angle, Φ0For arbitrary constant phase
Value；
All main becket micro-structures 231, the phase gradient from center to edge gradually become smaller.
Further, the pyramidal horn antenna of the feed 3 is divided into waveguide portion and subtended angle part, and waveguide portion
Positioned at the top of subtended angle part, subtended angle part bottom opening face face principal reflection mirror 2；The phase center of feed 3 is located at subtended angle
Aperture centre is opened in part bottom, which is overlapped with the focus of principal reflection mirror 2.
Compared with prior art, the present invention having the following advantages that：
1. the present invention is based on this alunite of broad sense by introducing on the principal reflection mirror of concave surface since primary reflection surface uses concave mirror
The super surface texture of SPA sudden phase anomalies of your law building, compares existing rotational field antenna, shortens focal length, reduce antenna height.
2. inventive antenna is provided with enough main becket micro-structures on principal reflection mirror phase regulation layer, and considers
Main becket micro-structure corresponds to the variation of incidence angle at different location, can improve the precision of phase compensation.
3. the present invention due to principal reflection mirror by dielectric layer, be printed on the reflecting layer and another side of one side of dielectric layer
Phase regulation layer composition, with simple, easy to process, the at low cost feature of structure.
Detailed description of the invention
Fig. 1 is overall structure diagram of the invention；
Fig. 2 is the principal reflection mirror structural schematic diagram in the present invention；
Fig. 3 is two-dimensional radiation directional diagram of the embodiment of the present invention in 20GHz frequency；
Fig. 4 is S11 analogous diagram of the embodiment of the present invention in 19.0GHz~21.0GHz；
Fig. 5 is the embodiment of the present invention in 20GHz frequency, and electric field is respectively in 375mm, 750mm, 1500mm, 3000mm
The sectional view of xoy plane.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Referring to Fig.1, the present invention includes carrier 1, principal reflection mirror 2, feed 3 and support construction 4.Carrier 1 is located at antenna entirety
The bottom of structure, the conformal upper surface for being embedded in carrier 1 of principal reflection mirror 2, carrier 1 use concave structure, and feed 3 uses angle
Electromagnetic horn is bored, which is divided into waveguide portion and subtended angle part, which is standard WR51 waveguide, waveguide
Part is located at the top of subtended angle part, and subtended angle part bottom opening face face principal reflection mirror 2, support construction 4 is for fixed feedback
Source 3.
The concave structure that the carrier 1 uses is concavity paraboloid column construction, and along the Vertical Square of cylindrical surface bus
It is bent upwards to from center to both sides of the edge, to specifically describe the paraboloid equation that 1 concave structure of carrier is followed, with main anti-
Penetrating 2 upper surface center of mirror is that coordinate origin establishes cartesian coordinate system, and x-axis is along cylinder bending direction, and y-axis is along segment of a cylinder side
To z-axis is vertical with x-axis and y-axis, and carrier 1 is bent upwards from center to both sides of the edge along x-axis, and bending degree defers to opening upwards
Paraboloid equation：Z=(1/600) * x*x, center thickness are less than edge thickness.
The principal reflection mirror 2 and the setting of feed 3 are positive feedback mode, the i.e. central point of principal reflection mirror 2 and feed 3 same
On straight line.
The phase center of the feed 3 is located at subtended angle part bottom and opens aperture centre, the phase center and principal reflection mirror 2
Focus be overlapped, coordinate be (0,0,101.58mm).According to the dimensional values of standard WR51 waveguide, waveguide portion edge is obtained
The constant interval of coordinate x is [- 7.495mm, 7.495mm], and the constant interval along coordinate y is [- 4.255mm, 4.255mm], edge
The constant interval of coordinate z is [139.68mm, 149.68mm].According to the specific value of pyramidal horn antenna, subtended angle part is obtained
Constant interval along coordinate x is [- 11.43mm, 11.43mm], and the constant interval along coordinate y is [- 8.89mm, 8.89mm], edge
The constant interval of coordinate z is [101.58mm, 139.68mm].
The support construction 4 is made of four rigid plastics rods, and every plastics rod is separately connected primary reflection surface 2 and feed 3
The ipsilateral endpoint in subtended angle part bottom opening face, the length that this example set but be not limited to every plastics rod is 143.12mm.
Referring to Fig. 2, the principal reflection mirror 2, using concave structure comprising main dielectric layer 21, principal reflection layer 22 and main phase
Principal reflection layer 22 is printed in position regulation layer 23, main 21 lower surface of dielectric layer, and main 21 upper surface of dielectric layer printing master phase regulates and controls layer
23。
The main dielectric layer 21 is concavity paraboloid column construction, is used with a thickness of 0.5mm, relative dielectric constant 4.4,
Relative permeability be 1 dielectric material, this example set but be not limited to main dielectric layer 21 along x-axis length as 222.40mm, along y
The length of axis is 225mm, the setting of this size mainly consider whole principal reflection mirror 2 when with enough electric sizes,
The precondition that preferable wavefront calibrates effect, change of the main dielectric layer 21 along coordinate x can be obtained in the case where design frequency is 20GHz
Changing section is [- 111.2mm, 111.2mm], and the constant interval along coordinate y is [- 112.5mm, 112.5mm], along the change of coordinate z
Changing section is [- 0.5mm, 27.00mm].
The principal reflection layer 22 is made of concavity paraboloid metal plate, is embedded in the lower surface of main dielectric layer 21, due to main anti-
The dimensional values for penetrating layer 22 cannot be greater than the size of main dielectric layer 21, thus according to the coordinate values variation zone of main dielectric layer 21
Between, this example sets but is not limited to the centre coordinate of principal reflection layer 22 as (0,0, -0.5mm), the constant interval along coordinate x be [-
111.2mm, 111.2mm], along coordinate y constant interval be [- 112.5mm, 112.5mm], along coordinate z constant interval be [-
0.5mm,27.00mm]。
The original for more main becket micro-structures 231 of arranging according to the size of main dielectric layer 21 and in master phase regulation layer 23
Then, this example sets but is not limited to the main metal that master phase regulation layer 23 is evenly spaced in main 21 upper surface of dielectric layer by 3900
Ring micro-structure 231 forms, for generating vortex electromagnetic wave.Main becket micro-structure 231 is square becket, main becket
Micro-structure 231 along coordinate x constant interval be [- 109.83mm, 109.83mm], along coordinate y constant interval be [-
112.5mm, 112.5mm], the constant interval along coordinate z is [0mm, 27.00mm], in adjacent main becket micro-structure 231
The heart is 3.75mm in the direction x spacing, is 3.75mm in the direction y spacing.The side length L of each main becket micro-structure 2311And line
Wide w1Incidence angle θ by the incident electromagnetic wave of its position relative to principal reflection mirror 2iWith phase compensation numerical value Φ (x, y, z)
It determines, variation range will meet the numerical requirements of sub-wavelength, and the position phase of each main becket micro-structure 231 is mended
It is as follows to repay numerical value Φ (x, y, z) calculating：
Wherein d Φ=k (sin θi-sinθr) dr indicate Φ (x, y, z) to the derivative of r, whereinθiFor incoming electromagnetic
Incidence angle of the wave relative to principal reflection mirror 2, θrAngle of reflection for reflection electromagnetic wave relative to principal reflection mirror 2, k=24 °/mm are
20GHz Electromagnetic Wave Propagation constant, f=101.58mm are the focal length of principal reflection mirror 2, and M=1 indicates the mode value that electromagnetism is vortexed, θ
For vortex angle, Φ0For arbitrary constant phase value；
According to calculate satisfaction needed for main becket micro-structure 231 at different location coordinate phase compensation numerical value Φ (x, y,
Z) structural parameters that each main becket micro-structure 231 is met are determined, these parameters include：Incidence angle θiVariation zone
Between be [0 °, 31.68 °], phase compensation numerical value Φ (x, y, z) constant interval be [- 180 °, 180 °], side length L1Constant interval is
[1.12mm, 3.5mm], line width w1Constant interval is [0.1mm, 0.55mm], and all main becket micro-structures 231 press helical form
Overall distribution, and the phase gradient from center to edge becomes larger.
This example sets but is not limited to the focal length of principal reflection mirror 2 as f=101.58mm, and the geometry focal length of carrier 1 is
The focal length of 150mm, the focal distance ratio carrier 1 of principal reflection mirror 2 shorten 32.28%, illustrate to be able to achieve short focus effect.
Below in conjunction with the simulation experiment result, technical effect of the invention is described in further detail.
1. simulated conditions：
Electromagnetic simulation software CST 2017.
2. emulation content
Emulation 1 carries out full-wave simulation, knot to far field radiation pattern of the embodiment of the present invention under 20.0GHz frequency
Fruit is as shown in figure 5, wherein：Fig. 3 (a) is the present embodiment in the face E far field radiation pattern, and Fig. 3 (b) is that the present embodiment is remote in the face H
Field antenna pattern.
From Fig. 3 (a) as it can be seen that angle of the embodiment of the present invention in two main beam radiation directions in the face E is -4 ° and 4 °,
In the gains of -4 ° of main beams be 23.29dBi, the gains of 4 ° of main beams is 20.35dBi, illustrates that the present invention can obtain in the face E
Biggish gain.
From Fig. 3 (b) as it can be seen that the embodiment of the present invention the radiation direction of two main beams in the face H angle be -4 ° and 4 °,
In the gains of -4 ° of main beams be 21.30dBi, the gains of 4 ° of main beams is 23.10dBi, illustrates that the present invention can obtain in the face H
Biggish gain.
Emulation 2 carries out full-wave simulation to S11 performance of the embodiment of the present invention under 19.0GHz~21.0GHz frequency,
As a result as shown in Figure 4.
As seen from Figure 4, S11 in 19.0GHz~21.0GHz frequency range of the embodiment of the present invention is entirely below -10dB, explanation
The embodiment of the present invention has good matching properties.
Emulation 3 carries out the field distribution of Electromagnetic Wave Propagation direction tangent plane under 20GHz frequency of the embodiment of the present invention complete
Wave emulation, result are as shown in Figure 5.
Fig. 5 is illustrated when being respectively 375mm, 750mm, 1500mm, 3000mm apart from antenna, and side length is 375mm square
Field distribution in inspection surface, from figure 5 it can be seen that inspection surface is located at the close of antenna when apart from antenna 375mm and 750mm
Place, field distribution tentatively show helical form, and when apart from antenna 1500mm and 3000mm, inspection surface is located at the remote of antenna
Place, field distribution in the shape of a spiral, meet field distribution rotate a circle phase number change 360 °, diagonal direction phase number
Opposite conclusion.
To sum up, the present invention can shorten the focal length of rotational field antenna, save shared by antenna entirety for emitting vortex electromagnetic wave
Space reduces phase compensation error, is suitable for the fields such as communication, imaging.
Claims (5)
1. a kind of rotational field reflector antenna based on super surface, including carrier (1), principal reflection mirror (2), feed (3) and support
Structure (4), principal reflection mirror (2) and carrier (1) are conformal, and feed (3) uses pyramidal horn antenna, and support construction (4) is hard by four
Matter plastics rod composition, for fixing feed (3)；It is characterized in that：
The carrier (1) uses concave structure；
The principal reflection mirror (2) is using the super surface texture in SPA sudden phase anomalies concave surface constructed based on broad sense Snell's law, focal length
The height of integrated antenna is reduced, the principal reflection mirror packet for shortening the focal length of integrated antenna less than the geometry focal length of carrier (1)
Main dielectric layer (21), principal reflection layer (22) and master phase regulation layer (23) are included, and master phase regulation layer (23) is uniform by m × n
Main becket micro-structure (231) composition of arrangement, the phase compensation numerical value of each main micro- (231) structure of becket is different, owns
Main becket micro-structure (231) presses helical form overall distribution, for generating vortex electromagnetic wave, m >=12, n >=12.
2. antenna according to claim 1, it is characterised in that：The concave structure that carrier (1) uses is concavity paraboloid column
Shape structure, and being bent upwards from center to both sides of the edge along the vertical direction of cylindrical surface bus, bending degree defer to opening to
On paraboloid equation, center thickness be less than edge thickness.
3. antenna according to claim 1, it is characterised in that：The main dielectric layer (21) is concave structure, upper surface
Master phase regulation layer (23) is printed, principal reflection layer (22) are printed in lower surface.
4. antenna according to claim 1, it is characterised in that：The size of each main becket micro-structure (231) is by its institute
Incidence angle θ of the incident electromagnetic wave relative to principal reflection mirror (2) in positioniIt is determined with phase compensation numerical value Φ (x, y, z)；
The position phase compensation numerical value Φ (x, y, z) of each main becket micro-structure (231) calculates as follows：
Wherein d Φ=k (sin θi-sinθr) dr indicate Φ (x, y, z) to the derivative of r, whereinθiFor incident electromagnetic wave
Relative to the incidence angle of principal reflection mirror (2), θrAngle of reflection for reflection electromagnetic wave relative to principal reflection mirror (2), k are electromagnetic wave biography
Constant is broadcast, f is principal reflection mirror (2) focal length, and M indicates the mode value that electromagnetism is vortexed, and θ is vortex angle, Φ0For arbitrary constant phase
Value；
All main becket micro-structures (231), the phase gradient from center to edge gradually become smaller.
5. antenna according to claim 1, it is characterised in that：The pyramidal horn antenna of the feed (3), is divided into waveguide section
Point and subtended angle part, and waveguide portion is located at the top of subtended angle part, subtended angle part bottom opening face face principal reflection mirror
(2)；The phase center of feed (3) is located at subtended angle part bottom and opens aperture centre, the coke of the phase center and principal reflection mirror (2)
Point is overlapped.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810584369.XA CN108923130B (en) | 2018-06-08 | 2018-06-08 | Vortex field reflecting surface antenna based on super surface |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810584369.XA CN108923130B (en) | 2018-06-08 | 2018-06-08 | Vortex field reflecting surface antenna based on super surface |
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| CN108923130B CN108923130B (en) | 2021-01-05 |
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Cited By (2)
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| CN110412571A (en) * | 2019-07-19 | 2019-11-05 | 西安电子科技大学 | Synthetic aperture radar three-dimensional imaging method based on electromagnetism vortex wave |
| CN110429390A (en) * | 2018-12-19 | 2019-11-08 | 西安电子科技大学 | The four conformal reflector antennas of wave beam rotational field based on super surface |
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| CN110412571A (en) * | 2019-07-19 | 2019-11-05 | 西安电子科技大学 | Synthetic aperture radar three-dimensional imaging method based on electromagnetism vortex wave |
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