CN108832305A - Cassegrain rotational field antenna based on super surface - Google Patents
Cassegrain rotational field antenna based on super surface Download PDFInfo
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- CN108832305A CN108832305A CN201810584413.7A CN201810584413A CN108832305A CN 108832305 A CN108832305 A CN 108832305A CN 201810584413 A CN201810584413 A CN 201810584413A CN 108832305 A CN108832305 A CN 108832305A
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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
- H01Q19/18—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 having two or more spaced reflecting surfaces
- H01Q19/19—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 having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface
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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
- H01Q15/16—Reflecting surfaces; Equivalent structures curved in two dimensions, e.g. paraboloidal
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Abstract
The invention discloses a kind of Cassegrain rotational field antenna based on super surface, mainly solves that existing rotational field antenna focal length is big, and phase compensation error is big, and antenna integrally takes up space big problem.It includes carrier (1), principal reflection mirror (2), subreflector (3), feed (4) and support construction (5), carrier uses concave structure, principal reflection mirror is conformal with carrier, it is main, subreflector is all made of the super surface texture of SPA sudden phase anomalies, the focal length of principal reflection mirror is less than the geometry focal length of carrier, for realizing short focus effect, principal reflection mirror is parabolic cylinder structure, the principal reflection mirror includes main dielectric layer, principal reflection layer and master phase regulate and control layer, wherein master phase regulates and controls layer by multiple evenly distributed, and it is formed by the main becket micro-structure of helical form overall distribution, for generating vortex electromagnetic wave.The present invention can be shortened the focal length of Cassegrain rotational field antenna, reduces phase compensation error, efficiently excites vortex electromagnetic wave, can be used for communication and radar.
Description
Technical field
The invention belongs to antenna technical field, in particular to a kind of Cassegrain rotational field antenna, can be used for communicate and at
Picture.
Technical background
Traffic capacity demands sharp increase in recent years, and vortex electromagnetic communication is good orthogonal since its different modalities has
Property, it can be formed largely with frequency multiplex channel, greatly improve the availability of frequency spectrum and message capacity, therefore become the weight of people's research
Point.In vortex electromagnetic communication, efficiently exciting vortex electromagnetic wave is key link therein, and has good orientation and height
The rotational field antenna of quality spiral shape phase distribution can realize remote transmission, identification and the multiplexing of vortex electromagnetic wave.Card plug lattice
Human relations antenna is increase hyperboloid subreflector on the basis of parabola antenna, and electromagnetic wave is reflected by subreflector and primary reflection surface
The antenna pattern of high directivity is obtained afterwards.Compared to Regular parabolic surface antenna, the increased subreflector of Cassegrain antenna
Antenna radiation performance can be optimized, feed is disposed close to primary reflection surface apex, significantly shortening feed line length, reduces loss and is
System noise coefficient, and introduce phase gradient on major-minor reflecting surface and change small super surface texture, vortex field phase may be implemented
Control accurate can efficiently excite vortex electromagnetic wave.
However after the geometry of the paraboloid primary reflection surface of Cassegrain antenna determines, antenna focal length also can therewith really
It is fixed, it cannot achieve the flexible adjustable of focal length, to shorten focal length, then the curvature of paraboloid primary reflection surface becomes larger, and under bore
Primary reflection surface height increase, to antenna processing put forward higher requirements.
Existing research mostly uses microwave reflection face to construct rotational field antenna, excites vortex electromagnetic wave, such as Chinese patent, application
Publication No. is CN 105322285A, and the invention of entitled " a kind of orbital angular momentum antenna " discloses a kind of orbital angular momentum day
Line, including parabolic reflector and helical antenna feed, centre bit corresponding to the helical antenna feed least radius spiral
In parabolic reflector focal point, helical antenna feed generates vortex electromagnetic wave, outgoing wave is obtained after parabolic reflector.This
Though kind of antenna can realize the excitation of vortex electromagnetic field to a certain extent, its since vortex electromagnetic wave is that feed directly generates,
Feed configuration is complicated, and feed must be placed at the position of paraboloid geometry focal length, can not shorten focal length, antenna take up space compared with
Greatly.
Summary of the invention
Present invention aims in view of the deficiency of the prior art, propose a kind of Cassegrain based on super surface
Rotational field antenna reduces phase compensation error to simplify antenna structure, reduces the focal length of Cassegrain rotational field antenna, saves
Antenna is taken up space.
To achieve the above object, the present invention is based on the Cassegrain rotational field antennas on super surface, including
Carrier 1, principal reflection mirror 2, subreflector 3, feed 4 and support construction 5, principal reflection mirror 2 and carrier 1 are conformal, conformal
For center engraved structure, feed 4 uses pyramidal horn antenna, and support construction 5 is made of four rigid plastics rods, every plastics rod
It is separately connected the ipsilateral endpoint of primary reflection surface 2 and subreflector 3；It is characterized in that：
The carrier 1 uses concave structure；Principal reflection mirror 2 is recessed using the SPA sudden phase anomalies constructed based on broad sense Snell's law
The super surface texture in face, and 2 focal length of principal reflection mirror is less than the geometry focal length of carrier 1, for reducing the height of antenna entirety；Pair reflection
Mirror 3 is using the super surface texture of hyperbolic characteristic SPA sudden phase anomalies constructed based on broad sense Snell's law；
The principal reflection mirror 2, including main dielectric layer 21, principal reflection layer 22 and master phase regulate and control layer 23, master phase regulation
Layer 23 is made of m × n evenly arranged main becket micro-structures 231, and the scattering parameter phase of each secondary becket micro-structure
Position is different, and all main becket micro-structures 231 press helical form overall distribution, for generating vortex electromagnetic wave, m >=12, n >=12.
Preferably, the concavity that the concave structure that the carrier 1 uses is formed after translating for the parabola of opening upwards
Paraboloid column construction, and be bent upwards from center to both sides of the edge along the vertical direction of cylindrical surface bus, bending degree is abided by
From the paraboloid equation of opening upwards, center thickness is less than edge thickness.
Preferably, the hollow out cross section size and pyramidal horn antenna of the principal reflection mirror 2 and the conformal center of carrier 1
The cross-sectional sizes of waveguide portion are identical, and feed 4 is installed in hollow out position.
Preferably, the main dielectric layer 21 is concave structure, upper surface prints master phase and regulates and controls layer 23, lower surface
Print principal reflection layer 22；
Preferably, the size of each main becket micro-structure 231 is by the incident electromagnetic wave of its position relative to master
2 incidence angle θ of reflecting mirrori1It is determined with phase compensation numerical value Φ (x, y, z).All main becket micro-structures 231, from center to edge
Phase gradient gradually become smaller.
Preferably, it is characterized in that：The subreflector 3 is square structure, including secondary dielectric layer 31, secondary reflecting layer
32 regulate and control layer 33 with secondary phase；Secondary reflecting layer 32 is printed on secondary 31 upper surface of dielectric layer, and secondary phase regulation layer 33 is printed on secondary Jie
31 lower surface of matter layer, the phase regulate and control the secondary becket micro-structure that layer 33 is uniformly etched by i × j in secondary 31 upper surface of dielectric layer
331 compositions, i >=4, j >=4；The size of each pair becket micro-structure 331 reflects pair by the electromagnetic wave phase of its position
Mirror (3) incidence angle θi2It is determined with phase compensation numerical value Φ (x, y).
Preferably, the pyramidal horn antenna that the feed 4 uses.
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, shortens the focal length of principal reflection mirror, has saved antenna and taken up space.
2. the present invention due to principal reflection mirror and subreflector by dielectric layer, be printed on the reflecting layer of one side of dielectric layer
With the phase regulation layer composition of another side, the feature for having structure simple, easy to process, at low cost.
3. the phase regulation layer of principal reflection mirror and subreflector is arranged due to the variation according to electromagnetic wave incident angle by the present invention,
The precision of phase compensation is improved, vortex electromagnetic wave can be efficiently excited.
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 the subreflector structural schematic diagram in the present invention；
Fig. 4 is Electromagnetic Wave Propagation path and Feed Design schematic illustration of the invention；
Fig. 5 is two-dimensional radiation directional diagram of the embodiment of the present invention in 20GHz frequency；
Fig. 6 is S11 analogous diagram of the embodiment of the present invention in 19.0GHz~21.0GHz；
Fig. 7 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, subreflector 3, feed 4 and support construction 5.1, carrier
In the bottom of antenna entirety, the conformal upper surface for being embedded in carrier 1 of principal reflection mirror 2, and the two center hollow out, for installing feedback
Source 4, feed 4 use pyramidal horn antenna, are divided into waveguide portion and subtended angle part, which is standard WR51 waveguide.It is secondary
Reflecting mirror 3 is located at the surface of principal reflection mirror 2 and feed 4, which is connect by support construction 5 with principal reflection mirror 2.
The hollow out position, numerical quantization are as follows：
Cartesian coordinate system is established using 2 upper surface center of principal reflection mirror as coordinate origin, x-axis is along cylinder bending direction, y-axis
Along segment of a cylinder direction, z-axis is vertical with x-axis and y-axis.Because of the standard WR51 waveguide sections size of the waveguide portion of electromagnetic horn
It is identical as hollow out cross section size, so obtaining 1 hollow out position of carrier along coordinate according to the specific size of standard WR51 waveguide
The constant interval of x is [- 7.495mm, 7.495mm], and the constant interval along coordinate y is [- 4.255mm, 4.255mm], along coordinate z
Constant interval be [- 10mm, -0.5mm].2 hollow out position of principal reflection mirror along coordinate x constant interval be [- 7.495mm,
7.495mm], along coordinate y constant interval be [- 4.255mm, 4.255mm], along coordinate z constant interval be [- 0.5mm,
0mm]。
The carrier 1 is bent upwards from center to both sides of the edge along x-axis, and bending degree defers to the paraboloid side of opening upwards
Journey：Z=(1/600) * x*x, center thickness are less than edge thickness.
The feedback mode, i.e. principal reflection mirror 2,3 and of subreflector of being positive is arranged in the principal reflection mirror 2, subreflector 3 and feed 4
The central point of feed 4 is on same straight line.Support construction 5 is made of four rigid plastics rods, and every plastics rod is separately connected
The ipsilateral endpoint of primary reflection surface 2 and subreflector 3, the length that this example set but be not limited to every plastics rod is 139.18mm.
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 upper surface prints master phase and regulates and controls layer 23.
The main dielectric layer 21 is concavity paraboloid column construction, medium with a thickness of 0.5mm, relative dielectric constant 4.4,
Relative permeability is 1, this example set but be not limited to main dielectric layer 21 along x-axis length as 222.40mm, the length along y-axis is
225mm, the setting of this size mainly consider that whole principal reflection mirror 2, could be in design frequency when with enough electric sizes
Rate is the precondition for obtaining preferable wavefront under 20GHz and calibrating effect, main dielectric layer 21 be along the constant interval of coordinate x [-
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 principal reflection layer 22 by concavity paraboloid cylindricality metal board group at, be embedded in the lower surface of main dielectric layer 21, due to
The dimensional values of principal reflection layer 22 cannot be greater than the size of main dielectric layer 21, 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]。
This example sets but is not limited to the master that master phase regulation layer 23 is evenly spaced in main 21 upper surface of dielectric layer by 3576
Becket micro-structure 231 forms, for generating vortex electromagnetic wave.Main becket micro-structure 231 is square becket, due to master
The coordinate values range of becket micro-structure 231 cannot be greater than the size of main dielectric layer 21, therefore according to the coordinate of main dielectric layer 21
Numerical value change section, main becket micro-structure 231 is [- 109.83mm, 109.83mm] along the constant interval of coordinate x, along coordinate y
Constant interval be [- 112.5mm, 112.5mm], along coordinate z constant interval be [0mm, 27.00mm], adjacent main becket
The center of micro-structure 231 is 3.75mm in the direction x spacing, is 3.75mm in the direction y spacing.Each main becket micro-structure 231
Side length L1With line width w1By its incidence angle θ of position incident electromagnetic wave relative to principal reflection mirror 2i1With phase compensation numerical value
Φ (x, y, z) determines that the position phase compensation numerical value Φ (x, y, z) of each main becket micro-structure 231 first has to meet
The requirement of reflected plane wave calculates as follows：
Wherein d Φ=k (sin θi1-sinθr1) dr indicate Φ (x, y, z) to the derivative of r, whereinθi1For incidence
Incidence angle of the electromagnetic wave phase for principal reflection mirror 2, θr1Angle of reflection for reflection electromagnetic wave relative to principal reflection mirror 2, k=24 °/mm
For 20GHz Electromagnetic Wave Propagation constant, f=101.58mm is the focal length of principal reflection mirror 2, Φ0For arbitrary constant phase value.To make to lead
Becket micro-structure 231 meets the phase compensation numerical value of reflection vortex electromagnetic wave on the basis of this again, can add in original formula
Vortex factor M θ, wherein M indicates the mode value that electromagnetism is vortexed, and θ is vortex angle, the phase of final main becket micro-structure 231
It is as follows to compensate numerical value Φ (x, y, z) calculating：
Meet phase compensation numerical value Φ (x, y, z) as needed for main becket micro-structure 231 to increase relative to plane wave antenna
Add the phase of vortex angle, θ, therefore its structural parameters needs to realize variation in larger scope, according to calculating different location coordinate
The phase compensation numerical value Φ (x, y, z) for locating to meet needed for main becket micro-structure 231 determines each 231 institute of main becket micro-structure
The structural parameters of satisfaction, these parameters include：Incidence angle θi1Constant interval be [0 °, 57.63 °], 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], all main becket micro-structures 231 press helical form overall distribution, and the phase gradient from center to edge
It gradually becomes smaller.
Referring to Fig. 3, the subreflector 3, including secondary dielectric layer 31, secondary reflecting layer 32 and secondary phase regulate and control layer 33, described
Secondary dielectric layer 31 is square, and secondary reflecting layer 32 is printed in upper surface, and lower surface prints secondary phase and regulates and controls layer 33.
This example set but be not limited to secondary dielectric layer 31 with a thickness of 0.5mm, relative dielectric constant 4.4, relative permeability
Be 1, secondary dielectric layer 31 along coordinate x constant interval be [- 22.5mm, 22.5mm], along coordinate y constant interval be [-
22.5mm, 22.5mm], the constant interval along coordinate z is [86.1mm, 86.6mm].
The pair reflecting layer 32 is made of one piece of square-shaped planar metal plate, is embedded in the upper surface of secondary dielectric layer 31, due to
The dimensional values in secondary reflecting layer 32 cannot be greater than the size of secondary dielectric layer 31, this example sets but is not limited to the center in secondary reflecting layer 32
Coordinate be (0,0,86.6mm), along coordinate x constant interval be [- 22.5mm, 22.5mm], along coordinate y constant interval be [-
22.5mm, 22.5mm], there is fixed coordinate value z=86.6mm along coordinate z.
The pair phase regulates and controls layer 33 by multiple 331 groups of secondary becket micro-structure for being evenly spaced in secondary 31 lower surface of dielectric layer
At the number of secondary becket micro-structure 331 determines that this example takes but is not limited to 324 pairs by the size of secondary phase regulation layer 33
Becket micro-structure 331, secondary becket micro-structure 331 are square becket, and the center of adjacent pair becket micro-structure 331 exists
The spacing in the direction x is 2.5mm, and the spacing in the direction y is 2.5mm, and secondary becket micro-structure 331 is along the constant interval of coordinate x
[- 21.25mm, 21.25mm], the constant interval along coordinate y is [- 21.25mm, 21.25mm], there is fixed coordinate along coordinate z
Value z=86.1mm.The side length L of each pair becket micro-structure 3312With line width w2By the electromagnetic wave phase of its position for pair
The incidence angle θ of reflecting mirror 3i2It is determined with phase compensation numerical value Φ (x, y), the position of each pair becket micro-structure 331
Phase compensation numerical value Φ (x, y) calculates as follows：
Wherein d Φ=k (sin θi2-sinθr2) dr indicate Φ (x, y) to the derivative of r, whereinθi2To enter radio
Incidence angle of the magnetic wave relative to subreflector 3, θr2Angle of reflection for reflection electromagnetic wave relative to subreflector 3, k=24 °/mm are
20GHz Electromagnetic Wave Propagation constant, l=48mm are that the phase center of feed 4 and secondary phase regulate and control the distance between layer 33, Lh=
38.1mm is that the phase center of feed 4 and master phase regulate and control the distance between layer 23；l+Lh=86.1mm is that secondary phase regulates and controls layer
The distance between 33 and master phase regulation layer 23, the distance is equal with the z-axis coordinate value of each secondary becket micro-structure 331, i.e.,
Fixed coordinates numerical value z=l+Lh=86.1mm, and meet f>l+Lh, Φ0For arbitrary constant phase value.
The phase compensation numerical value Φ (x, y) of the satisfaction according to needed for calculating pair becket micro-structure 331 at different location coordinate,
Determine the structural parameters of each secondary becket micro-structure 331, these parameters include incidence angle θi2, phase compensation numerical value Φ (x,
Y), side length L2, line width w2, i.e. incidence angle θi2Constant interval be [0 °, 31.68 °], the variation zone phase compensation numerical value Φ (x, y)
Between be [- 171.35 °, 179.28 °], side length L2Constant interval is [1.12mm, 2.3mm], line width w2Constant interval be [0.1mm,
0.55mm]。
It is located at the front end of subtended angle part in the z-direction referring to Fig. 4, the phase center F1 of feed 4 and opens aperture centre, coordinate is
The virtual focus F2 of (0,0,38.1mm), subreflector 3 is overlapped with the focus of principal reflection mirror 2, and coordinate is (0,0,101.58mm), secondary
The real focus of reflecting mirror 3 is overlapped with the phase center F1 of feed 4.The empty focal length of the subreflector 3 is f-l-Lh=15.48mm,
Real focal length is l=48mm, and meets f-l-Lh<l。
The pyramidal horn antenna that feed 4 uses, is made of waveguide portion and subtended angle part, and waveguide portion is standard WR51
Waveguide, single mode transport frequency range obtain waveguide section according to the dimensional values of standard WR51 waveguide for 14.5GHz~22.0GHz
Point along coordinate x constant interval be [- 7.495mm, 7.495mm], along coordinate y constant interval be [- 4.255mm,
4.255mm], the constant interval along coordinate z is [- 10mm, 0mm].Subtended angle part along coordinate x constant interval be [- 11.43mm,
11.43mm], the constant interval along coordinate y is [- 8.89mm, 8.89mm], and the constant interval along coordinate z is [0mm, 38.1mm].
Subtended angle part front end is open the length A=22.86mm of long edge x-axis, by subreflector 3 along coordinate x constant interval [-
22.5mm, 22.5mm] the side length d=45mm, A and d that can obtain subreflector 3 meet following relational expression：
Wherein, f=101.58mm is the focal length of principal reflection mirror 2, Lh=38.1mm is phase center and the principal reflection of feed 4
The distance between master phase regulation 23 center of layer of mirror 2.
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 realize the effect for shortening focal length.
Below in conjunction with the simulation experiment result, technical effect of the invention is described in further detail.
1. simulated conditions and content：
Electromagnetic simulation software CST 2017.
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. 5 (a) is the present embodiment in the face E far field radiation pattern, and Fig. 5 (b) is that the present embodiment is remote in the face H
Field antenna pattern.
From Fig. 5 (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 22.02dBi, the gains of 4 ° of main beams is 22.97dBi, illustrates that the present invention can obtain in the face E
Biggish gain.
From Fig. 5 (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 -3 ° and 3 °,
In the gains of -3 ° of main beams be 22.99dBi, the gains of 3 ° of main beams is 21.74dBi, 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 6.
As seen from Figure 6, S11 in 19.0GHz~21.0GHz frequency range of the embodiment of the present invention is entirely below -10dB, illustrates this
Inventive embodiments have 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 7.
Fig. 7 is illustrated when being respectively 375mm, 750mm, 1500mm, 3000mm apart from antenna, and side length is 375mm square
Field distribution in inspection surface, it can be seen from figure 7 that inspection surface is located at the close of antenna when apart from antenna 375mm and 750mm
Place, field distribution is with respect to disorder, and when apart from 100 wavelength of antenna and 200 wavelength, inspection surface is located at the far-field region of antenna, electricity
Field distribution in the shape of a spiral, meet field distribution rotate a circle phase number change 360 °, the opposite knot of diagonal direction phase number
By.
To sum up, the present invention can shorten the focal length of rotational field antenna, reduce phase compensation and miss for emitting vortex electromagnetic wave
Difference, while simplifying antenna structure, it is suitable for the fields such as communication, imaging.
Claims (10)
1. a kind of Cassegrain rotational field antenna based on super surface, including carrier (1), principal reflection mirror (2), subreflector (3),
Feed (4) and support construction (5), principal reflection mirror (2) and carrier (1) are conformal, and conformal center is engraved structure, and feed (4) uses
Pyramidal horn antenna, support construction (5) are made of four rigid plastics rods, every plastics rod be separately connected primary reflection surface (2) and
The ipsilateral endpoint of subreflector (3)；It is characterized in that：
Carrier (1) uses concave structure；Principal reflection mirror (2) is super using the SPA sudden phase anomalies concave surface constructed based on broad sense Snell's law
Surface texture, and the focal length of principal reflection mirror is less than the geometry focal length of carrier, for reducing the height of antenna entirety；Subreflector
(3) using the super surface texture of hyperbolic characteristic SPA sudden phase anomalies constructed based on broad sense Snell's law；
The principal reflection mirror (2), including main dielectric layer (21), principal reflection layer (22) and master phase regulation layer (23), the master phase
Regulation layer (23) is made of m × n evenly arranged main becket micro-structures (231), and each main becket micro-structure (231)
Phase compensation numerical value it is different, all main becket micro-structures (231) press helical form overall distribution, for generating vortex electromagnetism
Wave, m >=12, n >=12.
2. antenna according to claim 1, it is characterised in that：The concave structure that carrier (1) uses is the throwing of opening upwards
The concavity paraboloid column construction that object line is formed after translating, and along the vertical direction of cylindrical surface bus from center to two sides
Edge is bent upwards, and bending degree defers to the parabolic equation of opening upwards, and center thickness is less than edge thickness.
3. antenna according to claim 1, it is characterised in that：The hollow out at principal reflection mirror (2) and carrier (1) conformal center is horizontal
Cross-sectional sizes are identical as the cross-sectional sizes of pyramidal horn antenna waveguide portion, and feed (4) are installed in hollow out position.
4. antenna according to claim 1, it is characterised in that：The main dielectric layer (21) is concave structure, master phase tune
Control layer (23) is printed on the upper surface of main dielectric layer (21), and principal reflection layer (22) is printed on the lower surface of main dielectric layer (21).
5. 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) is set in placei1It is determined with phase compensation numerical value Φ (x, y, z)；
Wherein d Φ=k (sin θi1-sinθr1) dr indicate Φ (x, y, z) to the derivative of r, whereinθi1For incoming electromagnetic
Incidence angle of the wave relative to principal reflection mirror (2), θr1Angle of reflection for reflection electromagnetic wave relative to principal reflection mirror (2), k are electromagnetic wave
Propagation constant, f are the focal length of principal reflection mirror (2), 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.
6. antenna according to claim 1, it is characterised in that：The subreflector (3) is square structure, including secondary Jie
Matter layer (31), secondary reflecting layer (32) and secondary phase regulation layer (33)；The pair reflecting layer (32) is printed on the upper of secondary dielectric layer (31)
Surface, pair phase regulation layer (33) are printed on the lower surface of secondary dielectric layer (31).
7. antenna according to claim 6, it is characterised in that：Pair phase regulation layer (33) is uniformly etched by i × j
Secondary becket micro-structure (331) composition on medium substrate, i >=4, j >=4；The size of each pair becket micro-structure (331)
Incidence angle θ by the incident electromagnetic wave of its position relative to subreflector (3)i2It is determined with phase compensation numerical value Φ (x, y)：
Each pair becket micro-structure (331) position phase compensation numerical value Φ (x, y) calculates as follows：
Wherein d Φ=k (sin θi2-sinθr2) dr indicate Φ (x, y) to the derivative of r, whereinθi2For incident electromagnetic wave
Relative to the incidence angle of subreflector (3), θr2Angle of reflection for reflection electromagnetic wave relative to subreflector (3), k are electromagnetic wave biography
Constant is broadcast, l is that the phase center of feed (4) and secondary phase regulate and control the distance between layer (33), LhFor the phase center of feed (4)
The distance between master phase regulation layer (23)；l+LhFor secondary phase regulate and control layer (33) and master phase regulation layer (23) between away from
From the distance is equal with the z-axis coordinate value of each secondary becket micro-structure (331), i.e. fixed coordinates numerical value z=l+Lh, and it is full
Sufficient f>l+Lh, Φ0For arbitrary constant phase value.
8. antenna according to claim 1, it is characterised in that：The subreflector (3), virtual focus are located at subreflector
(3) top, real focus is located at the lower section of subreflector (3), and the virtual focus is overlapped with the focus of principal reflection mirror (2), the reality
Focus is overlapped with the phase center of feed (4).
9. antenna according to claim 1, it is characterised in that：The subreflector (3), empty focal length are f-l-Lh, real burnt
Away from for l, and meet f-l-Lh<l。
10. antenna according to claim 1, it is characterised in that：The pyramidal horn antenna that the feed (4) uses,
The length A of angle part front end opening long side and the side length d of subreflector (3) meet following relational expression：
Wherein, f is the focal length of principal reflection mirror (2), LhFor feed (4) phase center and master phase regulate and control layer (23) between away from
From.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810584413.7A CN108832305B (en) | 2018-06-08 | 2018-06-08 | Cassegrain vortex field antenna based on super surface |
Applications Claiming Priority (1)
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| CN102856664B (en) * | 2012-07-31 | 2015-07-01 | 深圳光启创新技术有限公司 | Cassegrain type metamaterial antenna |
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