CN205718677U - The super surface invisible clothes of three-dimensional complete polarization - Google Patents
The super surface invisible clothes of three-dimensional complete polarization Download PDFInfo
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- CN205718677U CN205718677U CN201620412207.4U CN201620412207U CN205718677U CN 205718677 U CN205718677 U CN 205718677U CN 201620412207 U CN201620412207 U CN 201620412207U CN 205718677 U CN205718677 U CN 205718677U
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Abstract
The utility model discloses the super surface invisible clothes of a kind of three-dimensional complete polarization.It is to be spliced by phase shift resonance unit seamless；Phase shift resonance unit is made up of upper strata, intermediate layer and layer dielectric, it is long that every outline line size of phase shift resonance unit is respectively less than working electromagnet wave-wave, top dielectric is to have the resonance structure of complete polarization function, top dielectric is fixed on the upper surface of interlayer, interlayer is non-metallic layer, layer dielectric is metal level, and the upper surface of layer dielectric and the lower surface of middle level medium are close to and fit like a glove；The back wave phase place of the change of each phase shift resonance unit meets condition: δ=180 ° 2kbHcos (θ), in formula, δ is the back wave phase place changing, and θ is the complementary angle of working electromagnet ripple and the horizontal plane angle of invisible clothes, and h is the geometrical center to center height overhead of phase shift resonance unit, kbWorking electromagnet wave-wave number for invisible clothes.It is insensitive to the polarised direction of working electromagnet ripple that the utility model surpasses surface invisible clothes, it is adaptable to all electromagnetic wave frequency ranges.
Description
Technical field
The utility model belongs to the stealthy field of electromagnetic wave, is specifically related to the amplitude of a kind of complete polarization and the super surface invisible clothes of phase place holding.
Background technology
Therefrom state's masterpiece Journey to the West is to the fairy tale of Greece, so that present Harry Potter, people are never rested for stealthy fine illusion.In the last few years, with the development of anisotropic media, electromagnetic wave is stealthy has been no longer fine illusion.Electromagnetic wave refers to be carried out energy and a kind of ripple of momentum transmission by in-phase oscillation and mutually perpendicular electric field with the magnetic field form with cyclic swing in space.Electromagnetic spectrum includes all possible frequency of electromagnetic radiation, and electromagnetic spectrum frequency is respectively radio wave, microwave, infrared light, visible ray, ultraviolet, X-ray and gamma ray from low to high.Usually, electromagnetic wave irradiation is on object, it is impossible to fully travels to after object, and can scatter on object.Radar measures the direction of target, distance, height etc. according to the electromagnetic wave reflecting.
Traditional stealth technology is by the body structure surface various functional material of coating, thus reaches loss or scatter radar ripple and the purpose of suppression target surface infrared intensity.It but these stealthy coating materials realize stealthy based on inhaling ripple principle, is only applicable to single base station radar invisible, and can not be stealthy to bistatic radar, it is therefore easy for being found by bistatic radar, it is impossible to realize that the perfection of structure is stealthy.In optical band, existing stealth technology or military camouflage color etc., then, with the change of background environment, this technology will no longer have that stealth effect, and therefore this is a kind of camouflage, rather than disappears from sight line veritably.Separately have a kind of invisible method, by optical fiber, light be directed to from side opposite side, thus walk around the object of centre, but such device is higher to the technological requirement of optical fiber, and need the optical fiber of substantial amounts, and can only realize on a direction stealthy.Therefore, these invisible methods are not the preferable invisible methods that common people can receive.
Preferable invisible clothes principle is not to inhale ripple but changes the round of ripple, and electromagnetic wave is walked around by stealthy object, and will not be blocked by object according to original propagated, electromagnetic wave at the another side of object, so that will not present shadow region after object.In this case, electromagnetic wave irradiation is on object, is equivalent to this object and does not exists, namely object has obtained perfect stealthy.Currently mainly having the method that two kinds of electromagnetic waves are stealthy, the first is based on scattering cancellation principle；Plasma material covers on media object, and the dipole exciting will offset each other, and scattered field substantially reduces, thus realizes that internal objects is stealthy.In microwave section, this stealthy function can be realized with anisotropic media.But, when the size being hidden object increases, needing higher dipole pattern, this is difficult to realize in reality.Another kind of method is the transform optics method that Pendry proposes；Utilizing tolerance consistency and the coordinate transformation method of maxwell equation group, creating one " hole " in the real space, light can entirely walk around this " hole ".In experimental verification, they use a kind of anisotropic media (Metamaterial) material to realize: use metal pattern array structure to go out effective dielectric constant and equivalent permeability parameter with spatial variations, the medium with anisotropic properties, and make these EFFECTIVE MEDIUM place according to certain requirement in cylindrical coordinate, realize the stealthy device of cylinder.But the method for this employing stealthy device of metal pattern array structure, building method is more complicated, and owing to metal is very big in the loss of optical frequencies, and yardstick diminishes aft-loaded airfoil difficulty, and said method is substantially only used for microwave or far infrared frequency range.The stealthy device method for designing proposing due to Pendry etc. is very harsh to the requirement of material, implement highly difficult, expensive, simultaneously this material is very violent due to dispersion, can only operate in a very narrow frequency separation, and it is only effective to the electromagnetic wave of particular polarization to adopt the stealthy device realizing in this way, it is impossible to realize to any polarized electromagnetic wave is stealthy.
Sum it up, the limitation of the above-mentioned invisible method in prior art mainly has:
1. most of tradition invisible clothes can be only applied to particular polarization electromagnetic wave, if the complete polarization of conventional bulk invisible clothes to be realized, needing to control six electromagnetic parameters, i.e. three spatial components of three spatial components of dielectric constant and magnetic conductivity, this makes to realize that difficulty is very big.
2. most of invisible clothes all use light path to approximate, and the refractive index i.e. keeping parameter is constant, change impedance, in order to utilize existing material to realize, but if impedance mismatch can cause very strong reflection, still can be detected by hidden substance.
3. existing complete polarization invisible clothes all uses quasi-conformal mapping method to design, but this method can make back wave introduce a laterally offset, so object does not obtain perfect stealthy.
Utility model content
The purpose of this utility model is to provide the super surface invisible clothes of a kind of three-dimensional complete polarization, thus overcomes all or part of defect of prior art.
For achieving the above object, technical solution adopted in the utility model is:
The super surface invisible clothes of a kind of three-dimensional complete polarization of the utility model is spliced by phase shift resonance unit seamless；Described phase shift resonance unit is made up of top dielectric, interlayer and layer dielectric, and it is long that every outline line size of phase shift resonance unit is respectively less than working electromagnet wave-wave；Top dielectric is to have the resonance structure of complete polarization function, and top dielectric is fixed on the upper surface of interlayer, and interlayer is non-metallic layer, and layer dielectric is metal level, and the upper surface of layer dielectric and the lower surface of middle level medium are close to and fit like a glove；
The back wave phase place of the change of each phase shift resonance unit meets the condition shown in formula (1):
δ=180 °-2kbhcos(θ) (1)
In formula (1), δ is the back wave phase place changing, and θ is the complementary angle of working electromagnet ripple and the horizontal plane angle of invisible clothes, and h is the geometrical center to center height overhead of phase shift resonance unit, kbWorking electromagnet wave-wave number for invisible clothes.
Further, the resonance structure with complete polarization function described in the utility model for exciting metal pattern or the dielectric pattern of identical resonance to different polarized electromagnetic waves.
Compared with prior art, the beneficial effects of the utility model are:
The utility model surpasses surface invisible clothes simple light, economical and practical, and thickness is long less than working electromagnet wave-wave, belongs to ultrathin, can be with the object of stealthy arbitrary shape and size.Phase shift resonance unit flexible design, unrelated with by the size shape of hidden substance.In prior art, if the complete polarization of conventional bulk invisible clothes to be realized, needing to control 6 electromagnetic parameters, i.e. three spatial components of three spatial components of dielectric constant and magnetic conductivity, this makes to realize that difficulty is very big；And the utility model to surpass the phase shift resonance unit that surface invisible clothes uses insensitive to polarization of electromagnetic wave direction, overcome the shortcoming that can be only applied to particular polarization electromagnetic wave invisible clothes.Compared with traditional blanket type invisible clothes based on quasi-conformal mapping, the back wave phase place of the change that the utility model surpasses each phase shift resonance unit of surface invisible clothes meets the condition shown in formula (1), will not produce unnecessary back wave lateral shift.Compared with the blanket type invisible clothes approximating based on light path, the utility model surpasses back wave amplitude and the phase place that surface invisible clothes perfect can recover different polarized wave.The utility model surpasses surface invisible clothes and is applicable to all electromagnetic wave frequency ranges, especially has an extraordinary stealth effect in microwave section, and can realize under any working electromagnet ripple incident angle stealthy.
Brief description
Fig. 1 is that layer dielectric, interlayer are the schematic diagram of cubical phase shift resonance unit；
Fig. 2 is the top view of Fig. 1；
Fig. 3 is the top view of the phase shift resonance unit that resonance structure is duplex font metal pattern；
Fig. 4 is the schematic diagram of the phase shift resonance unit that layer dielectric, interlayer are positive six prisms；
Fig. 5 is the schematic diagram of super surface invisible clothes that the utility model is convex-shaped；
Fig. 6 is the top view that the utility model is plane super surface invisible clothes；
Fig. 7 is the schematic diagram that the utility model surpasses surface invisible clothes；
Fig. 8 is electromagnetic wave incident to the reflection schematic diagram on metal round platform；
Fig. 9 is electromagnetic wave incident to stealth effect schematic diagram during electromagnetic wave invisible clothes shown in Fig. 5；
In figure, 1. represent the layer dielectric of phase shift resonance unit；2. represent the interlayer of phase shift resonance unit；3. represent the top dielectric of phase shift resonance unit；4. represent the resonance structure in circular ring type metal pattern；5. represent the upper surface of interlayer；6. represent the resonance structure in duplex font metal pattern；7. represent the upper surface of the interlayer of regular hexagon phase shift resonance unit；8a-8e. represents the interlayer of phase shift resonance unit；9a-9e. represents the circular ring type metal pattern being etched in interlayer upper surface；10a-10e. represents the interlayer of phase shift resonance unit；11a-11e. represents the circular ring type metal pattern of the interlayer upper surface being etched in 10a-10e；12. represent placement by the bottom surface of hidden substance；One of them phase shift resonance unit of 13. expression super surface invisible clothes；14. expression working electromagnet ripple incident wave beams；15a-15g. represents that working electromagnet ripple incides the reflected beam on metal frustum cone side and upper surface；16. metal round platforms；17a-17g. represent working electromagnet ripple incide electromagnetic wave invisible clothes surround metal round platform when reflected beam.
Detailed description of the invention
The electromagnetic wave frequency range of the utility model indication includes all possible frequency of electromagnetic radiation.Electromagnetic wave frequency range is classified as radio wave, microwave, infrared ray, visible ray, ultraviolet, X-ray and gamma ray from low to high respectively.Electromagnetic wave frequency range is unlimited, and is continuous print.Polarization of electromagnetic wave is characterized in the time dependent characteristic of orientation of electric field vector on the set point of space, and describes with the time dependent track of the end points of electric field vector.If this track is straight line, then claim linear polarization；If track is round, then referred to as circular polarisation；If track is oval, then referred to as elliptic polarization.The electric field intensity of incidence wave is vertical with the plane of incidence, and the magnetic field of incidence wave is parallel with the plane of incidence, then claim TE ripple；The electric field intensity of incidence wave is parallel with the plane of incidence, and the magnetic field of incidence wave is perpendicular to the plane of incidence, then claim TM ripple；Electric field component and magnetic-field component are all only perpendicular to electromagnetic wave propagation direction, then claim TEM ripple.The amplitude of electromagnetic wave refers to the difference between the maxima and minima of electromagnetic wave, and the phase place of electromagnetic wave is to describe electromagnetic wave position in the circulating cycle at particular moment, in crest, trough or certain scale put between them.
Seamless spliced described in the utility model refers to be stitched together by bonding or the mode such as fit tightly between the side of phase shift resonance unit and the side of adjacent phase shift resonance unit, always forms a seamless entirety (as shown in Figure 5 and Figure 6).It should be noted that, if being plane by the surface of hidden substance, then being used for also can be in plane (as shown in Figure 6) to its stealthy invisible clothes, now can not need between phase shift resonance unit to be bonded together, as long as and the side of adjacent phase shift resonance unit fits tightly together each other, form seamless arrangement and i.e. may make up invisible clothes (as shown in Figure 6).
Electromagnetic wave refers to be carried out energy and a kind of ripple of momentum transmission by in-phase oscillation and mutually perpendicular electric field with the magnetic field form with cyclic swing in space.When electromagnetic wave runs into barrier, back wave can disorder.If the utility model being surpassed surface invisible clothes cover barrier, then reflecting effect the same when can realize not having barrier after electromagnetic wave incident.
As depicted in figs. 1 and 2, the utility model surpasses the phase shift resonance unit of surface invisible clothes and is made up of top dielectric the 3rd, interlayer 2 and layer dielectric 1, and it is long that every outline line size of phase shift resonance unit is respectively less than working electromagnet wave-wave；Top dielectric 3 is the resonance structure 4 with complete polarization function, top dielectric 3 is fixed on the upper surface 5 of interlayer 2, interlayer 2 is non-metallic layer, and layer dielectric 1 is metal level, and the upper surface of layer dielectric 1 and the lower surface of middle level medium 2 are close to and fit like a glove.The lower surface of layer dielectric 1 is the inner surface of invisible clothes.
The resonance structure with complete polarization function can be annulus, the duplex metal pattern such as font, square loop or dielectric pattern, can excite identical resonance to different polarized electromagnetic waves.The resonance structure 4 using in Fig. 2 is annulus metal pattern, and the resonance structure 6 using in Fig. 3 is duplex font metal pattern.The interlayer of phase shift resonance unit and layer dielectric design are also very flexible, various informative.For example, layer dielectric, the interlayer of the phase shift resonance unit shown in Fig. 4 is positive six prisms.
" the back wave phase place of change " that each phase shift resonance unit of super surface invisible clothes needs is relevant with working electromagnet wave-wave number, working electromagnet ripple incident angle and distance floor height.In the utility model, the back wave phase place of the change of each phase shift resonance unit can be made to meet the condition shown in formula (1) by changing the size of top dielectric:
δ=180 °-2kbhcos(θ) (1)
In formula (1), δ represents the back wave phase place of change, and θ represents the working electromagnet ripple of invisible clothes and the complementary angle of horizontal plane angle, and h represents the geometrical center to center of phase shift resonance unit height overhead, kbRepresent the working electromagnet wave-wave number of invisible clothes.
The utility model surpasses surface invisible clothes and is spliced by phase shift resonance unit seamless, as shown in Figure 5.The resonance structure of the phase shift resonance unit in Fig. 5 is annulus metal pattern, and the size of annulus 9a-9e is different.
Illustrate the phase shift resonance unit how designing on the invisible clothes of super surface below in conjunction with the phase shift resonance unit 13 in Fig. 7.Assume that working electromagnet ripple incident wave beam 14 incides the utility model with arbitrarily angled θ and surpasses on the invisible clothes of surface, back wave phase place δ of the change so constituting each phase shift resonance unit needs of super surface invisible clothes is different, phase shift resonance unit 13 is h apart from placing by the height of the bottom surface 12 of hidden substance, carry it into (1) formula, calculate back wave phase place δ of change.In practice, the size (i.e. the size of resonance structure) of available electromagnetic simulation software design top dielectric, the back wave phase place making the change of phase shift resonance unit is δ.
According to as above method, calculate the back wave phase place of the change that each phase shift resonance unit needs successively, and emulation obtains corresponding phase shift resonance unit.
When electromagnetic beam runs into barrier, back wave is disorderly.In Fig. 8, working electromagnet ripple impinges perpendicularly on barrier metal round platform 16,15a, 15b, 15c, 15d, 15e represent that working electromagnet ripple incides the back wave on the side of metal round platform 16, and 15f, 15g represent that working electromagnet ripple incides the back wave on the end face (i.e. upper surface) of metal round platform 16.The propagation characteristic of the electromagnetic beam at these ray representation present positions, the direction of ray represents the direction of propagation of energy of the electromagnetic beam at ray present position.By Fig. 8 it can be clearly seen that, on the side of metal round platform and end face on back wave direction all different, it is easy to be detected.
As it is shown in figure 9, surpassing the utility model after surface invisible clothes covers on metal round platform 16, the amplitude of reflected beam 17a-17g of working electromagnet ripple is consistent with phase place, is equal to metal round platform 16 and does not exists, it is achieved that stealthy to metal round platform 16.In addition to metal round platform, the object that the utility model invisible clothes can also be for other arbitrary shapes realizes stealthy.
Claims (2)
1. a super surface invisible clothes for three-dimensional complete polarization, is characterized in that: it is spliced by phase shift resonance unit seamless；Described
Phase shift resonance unit is made up of top dielectric, interlayer and layer dielectric, and every outline line size of phase shift resonance unit is equal
Long less than working electromagnet wave-wave；Top dielectric is to have the resonance structure of complete polarization function, and top dielectric is fixed on interlayer
Upper surface, interlayer is non-metallic layer, and layer dielectric is metal level, under the upper surface of layer dielectric and middle level medium
Surface is close to and fits like a glove；
The back wave phase place of the change of each phase shift resonance unit meets the condition shown in formula (1):
δ=180 °-2kbhcos(θ) (1)
In formula (1), δ is the back wave phase place changing, and θ is the complementary angle with horizontal plane angle for the working electromagnet ripple of invisible clothes, and h is
The geometrical center to center of phase shift resonance unit height overhead, kbWorking electromagnet wave-wave number for invisible clothes.
2. the super surface invisible clothes of a kind of three-dimensional complete polarization according to claim 1, is characterized in that: described have complete polarization
The resonance structure of function for exciting metal pattern or the dielectric pattern of identical resonance to different polarized electromagnetic waves.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105823378A (en) * | 2016-05-06 | 2016-08-03 | 浙江大学 | Three-dimensional fully-polarized super-surface invisible cloak |
| CN106852101A (en) * | 2016-12-30 | 2017-06-13 | 浙江大学 | A kind of method for designing of the stealthy cover of broadband magnetic |
| CN106909012A (en) * | 2017-01-31 | 2017-06-30 | 大连理工大学 | A kind of stealthy cape of controllable Two-Dimensional Heat based on multilayer two-dimension topology material |
| CN107579353A (en) * | 2017-08-25 | 2018-01-12 | 西安电子科技大学 | The conformal reflector antenna in high directionality column convex surface based on super surface |
| CN107634339A (en) * | 2017-08-25 | 2018-01-26 | 西安电子科技大学 | The conformal reflector antenna in high directionality umbrella convex surface based on super surface |
| CN108183333A (en) * | 2017-12-28 | 2018-06-19 | 中国人民解放军空军工程大学 | Flexible Cylindrical Conformal surpasses scatterer and its construction design method |
| CN111834753A (en) * | 2020-08-06 | 2020-10-27 | 中国人民解放军空军工程大学 | Fully-polarized super-surface carpet stealth coat and design method thereof |
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2016
- 2016-05-06 CN CN201620412207.4U patent/CN205718677U/en not_active Withdrawn - After Issue
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105823378A (en) * | 2016-05-06 | 2016-08-03 | 浙江大学 | Three-dimensional fully-polarized super-surface invisible cloak |
| CN105823378B (en) * | 2016-05-06 | 2017-05-10 | 浙江大学 | Three-dimensional fully-polarized super-surface invisible cloak |
| CN106852101A (en) * | 2016-12-30 | 2017-06-13 | 浙江大学 | A kind of method for designing of the stealthy cover of broadband magnetic |
| CN106909012A (en) * | 2017-01-31 | 2017-06-30 | 大连理工大学 | A kind of stealthy cape of controllable Two-Dimensional Heat based on multilayer two-dimension topology material |
| CN107579353A (en) * | 2017-08-25 | 2018-01-12 | 西安电子科技大学 | The conformal reflector antenna in high directionality column convex surface based on super surface |
| CN107634339A (en) * | 2017-08-25 | 2018-01-26 | 西安电子科技大学 | The conformal reflector antenna in high directionality umbrella convex surface based on super surface |
| CN107579353B (en) * | 2017-08-25 | 2020-10-09 | 西安电子科技大学 | High-directivity columnar convex surface conformal reflector antenna based on super surface |
| CN108183333A (en) * | 2017-12-28 | 2018-06-19 | 中国人民解放军空军工程大学 | Flexible Cylindrical Conformal surpasses scatterer and its construction design method |
| CN111834753A (en) * | 2020-08-06 | 2020-10-27 | 中国人民解放军空军工程大学 | Fully-polarized super-surface carpet stealth coat and design method thereof |
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Granted publication date: 20161123 Effective date of abandoning: 20170510 |
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