CN108987934A - A kind of ULTRA-WIDEBAND RADAR scattering section decrement Meta Materials and ULTRA-WIDEBAND RADAR - Google Patents
A kind of ULTRA-WIDEBAND RADAR scattering section decrement Meta Materials and ULTRA-WIDEBAND RADAR Download PDFInfo
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- CN108987934A CN108987934A CN201810569342.3A CN201810569342A CN108987934A CN 108987934 A CN108987934 A CN 108987934A CN 201810569342 A CN201810569342 A CN 201810569342A CN 108987934 A CN108987934 A CN 108987934A
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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
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
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Abstract
The present invention provides a kind of ULTRA-WIDEBAND RADAR scattering section decrement Meta Materials and ULTRA-WIDEBAND RADAR.The Meta Materials are made of M × N number of limited aperiodic structure unit；The limited aperiodic structure unit includes metal floor, dielectric-slab and the metal patch being arranged on the dielectric-slab；The metal patch includes cross metal patch and becket patch.
Description
Technical field
The invention belongs to Meta Materials technical fields, and in particular to a kind of ultra wide band based on more wave destructive interference physical mechanisms
Radar cross section (RCS) reduces Meta Materials and ULTRA-WIDEBAND RADAR.
Background technique
Electromagnetic energy is radiated in airspace by radar by antenna, and energy is propagated forward in the form of an electromagnetic wave.By
Diversity in target shape and surface will reflect after electromagnetic wave encounters target to multiple directions, a part of back wave meeting
The direction for returning to radar is trapped.Radar is believed according to the distance of the available measured target of the signal intercepted, direction, speed etc.
Breath.
Radar cross section (RCS) is the physical quantity for measuring radar return power.However, in order to reduce to radar emission
Electromagnetic wave reflection, it is desirable that the RCS for reducing target, make its be difficult in certain frequency range by enemy radar detect and know
Not, the key message of measured target can not be obtained, thus the detection of evading radar.When the timing of radar system one, measured target
RCS depends primarily on the electromagnetic property of face shaping and target material.By the design of contour structures, the back wave of target is inclined
From radar emission direction.However, Stealthy Technology has had evolved to bottleneck period, limited by aeroperformance, shape is stealthy
Technology is difficult the improvement for having big again.Electromagnetic energy can be converted into heat dissipation by absorbing material, but the country is about suction at present
The research of wave material the disadvantages of there is also narrowband, low efficiency, big density, using being also restricted；Plasma technique utilizes
High-Power Microwave generates plasma and realize to incident electromagnetic wave in the main scattering region of weapon platform to be absorbed or decays.
Summary of the invention
In order to solve the problems in the existing technology, the embodiment of the invention provides a kind of ULTRA-WIDEBAND RADAR scattering sections
Reduce Meta Materials surface and ULTRA-WIDEBAND RADAR:
An aspect of of the present present invention provides a kind of ULTRA-WIDEBAND RADAR scattering section decrement Meta Materials surface, the Meta Materials table
Face is made of M × N number of limited aperiodic structure unit；The limited aperiodic structure unit include metal floor, dielectric-slab with
And the metal patch on the dielectric-slab is set；The metal patch includes cross metal patch and becket patch.Metal
Ring patch can be metal side's ring patch, be also possible to metal ring patch or other becket patches.
Further, by the thickness parameter for the dielectric-slab being arranged in the limited aperiodic structure unit；With/
Or, the brachium parameter of the cross metal patch；And/or the dimensional parameters of the becket patch；It is described to inhibit to be incident on
The back scattering of Meta Materials surface electromagnetic wave.
Further, when on plane wave incidence to Meta Materials, the M × N number of limited aperiodic structure unit generation M
× N number of back wave destructive interference, thus reducing radar scattering cross section.
Further, the metal patch cell rings are arranged around the cross metal patch.
Further, the becket patch constitutes the P × P array for not including the T cross becket patch in center,
P, T is odd number.
Further, the width of the limited aperiodic structure unit is D, and the ring width of becket patch is ω, ω≤
D/P2, the becket patch is selected from one of the following size: the 1st size S1, meet D/P-2 ω < S1≤ D/P-ω；2nd size
S2, meet D/P-3 ω < S2≤D/P-2ω；3rd size S3, meet D/P-4 ω < S3≤D/P-3ω；……；P-2 size
SP-2, meet D/P- (P-1) ω < SP-2≤D/P-(P-2)ω。
Further, the width of the limited aperiodic structure unit is D, and the ring width of becket patch is ω, ω≤
D/P2, the cross metal patch is selected from one of the following size: wide W: the ω≤W of cross metal patch arm≤D/P, cross metal patch
Piece brachium L:3W≤L≤(P-2) W.
Further, the M × N number of limited aperiodic structure unit is 4 × 4.
Further, the dielectric-slab is F4B-2 dielectric-slab.
Further, the Meta Materials surface is in 6.16GHz-41.63GHz frequency range, it can be achieved that the RCS of 10dB or more subtracts
Contracting.
It is super using ULTRA-WIDEBAND RADAR scattering section above-mentioned decrement to provide a kind of ULTRA-WIDEBAND RADAR for another aspect of the present invention
Material surface.
The invention has the following beneficial effects: present invention firstly provides one kind by 16 kinds of non-periodic cells random arrangement structures
At Meta Materials, in 6.76 frequencys multiplication can be achieved 10dB or more RCS decrement.With 180 ° of phase difference cancellations and coding Meta Materials pair
Than more wave destructive interference methods used in the present invention have apparent advantage.It is largely substantially single using two kinds in previous research
Member carries out Meta Materials design, but present invention uses 16 kinds of aperiodic basic units, this unit not only can satisfy realization
The reflected phase characteristics of destructive interference can be reached certain RCS Reduce shrinkage effect with itself, significantly enhance Meta Materials to electricity
The ability of regulation and control of magnetic wave is, it can be achieved that the frequency range of 10dB or more RCS decrement is promoted by 3 previous frequencys multiplication to 6.76 frequencys multiplication.Utilize field
Principle of stacking, when on incident plane wave vertical irradiation to Meta Materials, the back wave of 16 non-periodic cells is in space overlapping, space
The electric field strength of middle certain point is the superposition of each back wave, and size and Orientation depends on the arrangement of 16 basic units.It is logical
The random arrangement to 16 kinds of non-periodic cells is crossed, the diffusing scattering of electromagnetic wave is realized, to achieve the purpose that reduce dual station RCS.
The content of present invention provides a kind of new mentality of designing and theory for the realization of RCS reducing technique.
Detailed description of the invention
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing；
Fig. 1 (a) is that the field superposition theory that incidence wave provided in an embodiment of the present invention is incident on M × N number of structural unit is shown
It is intended to；
Fig. 1 (b) is M in far-field region provided in an embodiment of the present invention × N number of back wave superposition schematic diagram；
Fig. 2 is aperiodic structure cell schematics provided in an embodiment of the present invention；
Fig. 3 is the schematic diagram provided in an embodiment of the present invention for regulating and controlling RCS deflating value by adjusting geometric parameter L and h；
Fig. 4 is the structure optimization flow chart of aperiodic structure unit in the present invention；
Fig. 5 (a) is the Meta Materials that 16 non-periodic cells provided in an embodiment of the present invention gone out by optimum choice are constituted
RCS reduce theoretical value curve graph varying with frequency；
Fig. 5 (b) is the reflected phase under the conditions of 16 aperiodic structures unit vertical incidence provided in an embodiment of the present invention
Curve graph varying with frequency；
Fig. 5 (c) is that the normalization under the conditions of 16 aperiodic structures unit vertical incidence provided in an embodiment of the present invention is anti-
Penetrate amplitude curve graph varying with frequency；
Fig. 6 is the Meta Materials schematic surface that 16 aperiodic structure units provided in an embodiment of the present invention are constituted；
Fig. 7 is that the Meta Materials that 16 aperiodic structure units are constituted subtract in x polarization and RCS under y polarization simulated conditions respectively
Contracting is worth curve graph varying with frequency；
Fig. 8 be 16 aperiodic structure units constitute Meta Materials surface in vertical incidence simulated conditions under Meta Materials with
Dual station directional diagram of the metal plate of same size in 7GHz, 12GHz, 20GHz；
Fig. 9 is Meta Materials surface TE and TM polarization under oblique incidence simulated conditions that 16 aperiodic structure units are constituted
RCS deflating value curve graph varying with frequency；
Figure 10 is the Meta Materials pictorial diagram that 16 aperiodic structure units are constituted；
Figure 11 is mono- static RCS measuring system schematic diagram；
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
The model that the present invention protects all should belong in member's every other embodiment obtained without making creative work
It encloses.
As one exemplary embodiment of the present invention, an emulation for providing a kind of ultra wide band RCS decrement Meta Materials is real
Scheme is applied, this Meta Materials works in 6.16GHz-41.63GHz frequency range, relative bandwidth 148.4%, ratio bandwidth 6.76:1.
In one embodiment of this specification, as shown in Fig. 1 (a), 1 (b), a superposition theory schematic diagram is given.When
When the Meta Materials surface that plane wave incidence is formed to M × N number of lattice, M × N number of back wave can be generated, M × N number of back wave is anti-
It penetrates coefficient amplitude and phase is different, back wave is superimposed in space, realizes destructive interference.The back wave that each lattice generates
Reflection coefficient be all arbitrary.
In one embodiment of this specification, as shown in Fig. 2, the design of non-periodic cells structure used in giving
Process.Becket patch constitutes the P × P array for not including the T cross becket patch in center, and P, T are odd number.
In an alternative embodiment, centrally located 9 in the periodic structure 7 × 7 square ring patches constituted
A side's ring patch is dug up, and a cross patch is substituted for, and brachium is 2 times of square ring side length, and arm is wide equal with square ring side length.Its
The geometric parameter L and dielectric thickness h of middle structure are main regulating object in follow-up work.
In one embodiment of this specification, as shown in figure 3, giving by adjusting geometric parameter L and dielectric thickness h
Regulate and control the schematic diagram of RCS deflating value.Need to consider simultaneously the amplitude and phase value of the reflection coefficient of basic unit.
In one embodiment of this specification, as shown in figure 4, giving the Optimizing Flow of aperiodic structure basic unit
Figure.
Flow chart is divided into two modules: array synthetic theory (PSO) module and more wave destructive interference (MWDI) modules.Pass through
16 groups of L and h values are constantly updated to calculate the RCS deflating value under different situations, the optimal RCS deflating value corresponding 16 searched for
Group L value and h value, this 16 groups of data are stored.
In one embodiment of this specification, as shown in Fig. 5 (a) to 5 (c), optimal 16 for giving selection are non-
The RCS for the Meta Materials that periodic unit is constituted reduces theoretical value curve graph varying with frequency.As can be seen that in very wide frequency range
There is apparent RCS Reduce shrinkage effect.Fig. 5 (b) is 16 aperiodic structures picking out in present invention under the conditions of vertical incidence
The reflected phase of unit curve graph varying with frequency.It can be seen that the reflected phase dynamic range of non-periodic cells is big, and bent
It is substantially parallel between line.Fig. 5 (c) is 16 aperiodic structure units picking out in present invention under the conditions of vertical incidence
Normalization reflection amplitudes curve graph varying with frequency.Visible curve is largely distributed under normalization amplitude 1, is illustrated non-
Periodic unit structure itself has had been provided with RCS decrement ability.These reflection characteristics all enhance Meta Materials and subtract on ultra wide band
The ability of contracting radar cross section.
In one embodiment of this specification, as shown in fig. 6, giving the achievable ultra wide band designed in the present invention
The Meta Materials of RCS decrement, alternatively referred to as Meta Materials surface.It is made of M × N number of limited non-periodic cells, it is each limited aperiodic
The dielectric thickness and patch size of unit are different.The value of M × N group dielectric thickness h and geometric parameter L are referring to Fig. 4 optimization knot
Fruit, M × N number of limited aperiodic structure unit have random structure size and position distribution.
In an alternative embodiment, the width of the limited aperiodic structure unit is D, the ring width of becket patch
Degree is ω, ω≤D/P2, the becket patch is selected from one of the following size: the 1st size S1, meet D/P-2 ω < S1≤D/P-
ω；2nd size S2, meet D/P-3 ω < S2≤D/P-2ω；3rd size S3, meet D/P-4 ω < S3≤D/P-3
ω；……；P-2 size SP-2, meet D/P- (P-1) ω < SP-2≤D/P-(P-2)ω。
In an alternative embodiment, 16 limited aperiodic structure units that number is 1-16 in Fig. 6, being can be by
Upset sequence random arrangement, and cross metal patch on each aperiodic structure unit and becket patch size can also
To change.Thickness parameter by the dielectric-slab being arranged in the limited aperiodic structure unit；And/or the cross
The brachium parameter of metal patch；And/or the dimensional parameters of the becket patch；To inhibit to be incident on the Meta Materials surface
The back scattering of electromagnetic wave.
In an alternative embodiment, Meta Materials are made of 4 × 4 limited non-periodic cells, this 16 limited non-weeks
There is random distributing order on phase unit.
In an alternative embodiment, the overall dimensions of 4 × 4 limited non-periodic cells are 224 × 224mm2。
In one embodiment, as shown in fig. 7, the Meta Materials subtract in x polarization and RCS under y polarization simulated conditions respectively
Contracting is worth curve graph varying with frequency.It can be seen that having the RCS deflating value of 10dB or more, ratio from 6.16GHz to 41.63GHz
Bandwidth is 6.76:1, and Reduce shrinkage effect is significant.It can be seen that novel physical mechanism used in the present invention --- more wave cancellations are dry
It relates to, the significant effect in terms of widening RCS decrement bandwidth.
In one embodiment, as shown in figure 8, giving under plane wave vertical incidence simulated conditions, Meta Materials and its
EM scattering directional diagram of the metal plate of same size in tri- Frequency points of 7GHz, 12GHz, 20GHz.It can be seen by comparison
Out, the dual station RCS Reduce shrinkage effect of Meta Materials is equally significant.
In one embodiment, it as shown in figure 9, giving under plane wave oblique incidence simulated conditions, polarizes respectively in TE
In the case of TM polarization, the RCS deflating value curve graph varying with frequency of Meta Materials.Oblique incidence angle is respectively 20 ° and 40 °.
It can be seen that in plane wave wide angle oblique incidence, either TE polarization or TM polarization can all be realized on ultra wide band
The RCS deflating value of 10dB or more.
In one embodiment, as shown in Figure 10, the Meta Materials pictorial diagram designed in the present invention is given, it is integrally-built
Geometric parameter is identical as geometric parameter used in simulation flow.Medium is the F4B-2 that dielectric constant is 2.65, medium bottom
Bonding metal floor, top bonding side ring metal patch and cross metal patch.
In one embodiment, as shown in figure 11, mono- static RCS measuring system schematic diagram is given.Electromagnetic horn emits ball
Surface wave, spherical wave reflect to form plane wave by paraboloid solid metal reflector.The distance between Meta Materials to be measured and reflector are full
Sufficient far field condition.Respectively as transmitter and receiver, antenna is connected on vector network analyzer two electromagnetic horns.
In conclusion the application of the physical mechanism of more wave destructive interferences proposed in this paper, has well solved Bandwidth-Constrained
The problem of.16 kinds are obtained by changing the dielectric thickness and square ring width of basic unit based on more wave destructive interference physical mechanisms
Different basic units constitutes Meta Materials, and this Meta Materials may be implemented to regulate and control electromagnetic wave on ultra wide band.This hair
Different physical mechanism and mentality of designing are used in bright realizes a kind of ultra wide band RCS decrement Meta Materials.With existing design
Difference is mainly, the present invention is based on more wave destructive interference mechanism, using 16 kinds of different limited aperiodic basic units,
Random arrangements are carried out to 16 kinds of basic units by array synthetic theory and particle swarm optimization algorithm, realize 6.76
The 10dB RCS of frequency multiplication reduces, and is greatly expanded bandwidth of operation.
It should be understood that " multiple " that refer in the present embodiment refer to two or more."and/or", description
The incidence relation of affiliated partner indicates may exist three kinds of relationships, for example, A and/or B, can indicate: individualism A, simultaneously
There are A and B, these three situations of individualism B.Character "/" typicallys represent the relationship that forward-backward correlation object is a kind of "or".
The serial number of the above embodiments of the invention is only for description, does not represent the advantages or disadvantages of the embodiments.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (11)
1. a kind of ULTRA-WIDEBAND RADAR scattering section reduces Meta Materials, which is characterized in that the Meta Materials are by M × N number of limited non-week
Phase structural unit is constituted；
The limited aperiodic structure unit includes metal floor, dielectric-slab and the metal patch being arranged on the dielectric-slab
Piece；The metal patch includes cross metal patch and becket patch.
2. Meta Materials surface according to claim 1, which is characterized in that by the way that the limited aperiodic structure unit is arranged
In the dielectric-slab thickness parameter；
And/or the brachium parameter of the cross metal patch；
And/or the dimensional parameters of the becket patch；
To inhibit to be incident on the back scattering of the Meta Materials surface electromagnetic wave.
3. Meta Materials according to claim 1, which is characterized in that when on plane wave incidence to Meta Materials, the M × N
M × N number of back wave destructive interference that a limited aperiodic structure unit generates, thus reducing radar scattering cross section.
4. Meta Materials according to claim 1, which is characterized in that the metal patch cell rings are pasted around the cross metal
Piece setting.
5. Meta Materials according to claim 1, which is characterized in that the becket patch, which is constituted, does not include center T ten
P × P array of font becket patch, P, T are odd number.
6. Meta Materials according to claim 5, which is characterized in that the width of the limited aperiodic structure unit is D, gold
The width for belonging to ring patch is ω, ω≤D/P2, the becket patch is selected from one of the following size:
1st size S1, meet D/P-2 ω < S1≤D/P-ω；
2nd size S2, meet D/P-3 ω < S2≤D/P-2ω；
3rd size S3, meet D/P-4 ω < S3≤D/P-3ω；
……
P-2 size SP-2, meet D/P- (P-1) ω < SP-2≤D/P-(P-2)ω。
7. Meta Materials according to claim 1, which is characterized in that the width of the limited aperiodic structure unit is D, gold
The ring width for belonging to ring patch is ω, ω≤D/P2, the cross metal patch is selected from one of the following size:
Wide W: the ω≤W of cross metal patch arm≤D/P, cross metal patch brachium L:3W≤L≤(P-2) W.
8. Meta Materials according to claim 1, which is characterized in that the M × N number of limited aperiodic structure unit is 4 × 4
It is a.
9. Meta Materials according to claim 1, which is characterized in that the dielectric-slab is F4B-2 dielectric-slab.
10. Meta Materials according to claim 1, which is characterized in that the Meta Materials surface is in 6.16GHz-41.63GHz
, it can be achieved that the RCS of 10dB or more reduces in frequency range.
11. a kind of ULTRA-WIDEBAND RADAR, which is characterized in that the ULTRA-WIDEBAND RADAR has ultra-wide described in one of claim 1-10
Band Radar cross-section redu-ction Meta Materials.
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| CN111900547A (en) * | 2020-08-21 | 2020-11-06 | 西安电子科技大学 | Broadband low-scattering microstrip array antenna based on coded super surface |
| CN112103661A (en) * | 2020-09-18 | 2020-12-18 | 中国科学院半导体研究所 | Transparent flexible broadband microwave low-scattering structure and transparent flexible skin |
| CN112736486A (en) * | 2020-12-05 | 2021-04-30 | 南京理工大学 | Broadband RCS (radar cross section) reduced diffuse reflection structure and design method thereof |
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