CN103295474A - Advertisement display screen based on metamaterial satellite antenna - Google Patents
Advertisement display screen based on metamaterial satellite antenna Download PDFInfo
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- CN103295474A CN103295474A CN2012100517606A CN201210051760A CN103295474A CN 103295474 A CN103295474 A CN 103295474A CN 2012100517606 A CN2012100517606 A CN 2012100517606A CN 201210051760 A CN201210051760 A CN 201210051760A CN 103295474 A CN103295474 A CN 103295474A
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Abstract
The invention discloses an advertisement display screen based on a metamaterial satellite antenna, which comprises a metamaterial satellite antenna system used for receiving satellite signals, as well as a display device used for displaying advertising information, wherein the metamaterial satellite antenna system comprises a tuner, a vertically placed panel metamaterial and a reflecting plate located on the rear surface of the panel metamaterial; the panel metamaterial comprises multiple metamaterial sheet layers; and each metamaterial sheet layer comprises a substrate and artificial microstructures periodically distributed on the substrate. According to the advertisement display screen, the metamaterial principle is used to prepare the panel satellite antenna to enable the satellite antenna to be well integrated with the conventional advertisement display device, so that the advertisement display device can change display frames in real time according to the satellite signals, and manually detaching the device for fixedly arranging a new frame again can be omitted. Meanwhile, the advertisement display screen based on the metamaterial satellite antenna is simple in preparation technology, low in cost, small in size and convenient to mount and maintain.
Description
Technical field
The present invention relates to a kind of ad display screen, relate in particular to a kind of ad display screen based on super material satellite antenna.
Background technology
Highway or river course, track bypass have often all been erect ad display screen at present, are used for showing advertising message or producer's information of product.Existing ad display screen adopts dual mode usually: the one, show advertising message by the mode of placard significantly, and the 2nd, show advertising message by the mode that in LED display, sets firmly repeat playing such as Word message or image information.The two all exists can not the real-time update advertising message, when the needs lastest imformation or need manually stick new placard or record new picture again and be fixedly arranged in the LED again, all has labor intensive, changes inconvenient defective.Simultaneously, single advertising message makes easily that also the beholder produces aestheticly tired, is unfavorable for the propagation of advertising message.
Existing satellite antenna is by the reflecting surface that is parabolic shape and be positioned at the feed of reflecting surface focus and tuner constitutes, and the reflecting surface of parabolic shape is used for receiving the feeble signal that transmitted by satellite and it is converged in the feed and tuner at focus place.The reflecting surface of parabolic shape brings a series of defective, for example can not with existing flat ad display screen efficient set, and the reflecting surface requirement on machining accuracy of parabolic shape is very high, volume is big, involve great expense.
Summary of the invention
Technical matters to be solved by this invention is, at the above-mentioned deficiency of prior art, proposes a kind of ad display screen based on super material satellite antenna.Super material satellite antenna processing in this ad display screen is simple, cost is lower and be shaped as tabular, volume is less, and it can well be gathered with the display device of routine, and installation and maintenance is simple.
The present invention solves the technical scheme that its technical matters adopts, and proposes a kind of ad display screen based on super material satellite antenna, and it comprises the super material satellite antenna system for receiving satellite signal, for the display device of demonstration advertising message; Described super material satellite antenna system comprises tuner, the super material of the flat board of horizontal positioned and the reflecting plate that is positioned at the super material of described flat board rear surface, the super material of described flat board comprises the super sheet of material of multilayer, every layer of super sheet of material comprises that base material and cycle are arranged in the artificial microstructure on the base material, described super sheet of material refractive index is that axis of symmetry becomes rotational symmetry to distribute with one bar axis, described tuner is tilted to down placement, and described tuner axis of symmetry points to the super material of described flat board and the described tuner axis of symmetry overlaps with the refractive index axis of symmetry of described super sheet of material in the projection of described super sheet of material.
Further, the close super sheet of material of the first side of described high frequency surface is described super sheet of material front surface, the opposite side surface relative with described front surface is described super sheet of material rear surface, described super sheet of material front surface is the x axle near one side of feed, another side perpendicular to the x axle is the y axle, initial point is positioned at the described super sheet of material front surface lower left corner, the index distribution n of described super sheet of material (x, y) satisfy following formula:
d
2＝cosα*(L-y)；
ss＝cosα*(L-y
1)
2+sinα*(z
1)
2；
y
1＝-h
2-d
s*cosθ；
z
1＝(h
1+h
2)*tanθ+d
s*sinθ；
Wherein, the downward value function of floor function representation, θ is tuner axis of symmetry and horizontal plane angle, α is the satellite elevation angle, h
1Be the y coordinate figure of the intersection point of tuner axis of symmetry and described super sheet of material front surface, h
2Be the y coordinate figure of tuner bore face central point at the subpoint on described super sheet of material plane, L is the total length of dull and stereotyped super material, d
sBe the distance of tuner phase center point with tuner bore face central point, λ is the electromagnetic wavelength of satellite radiation, n
MaxBe the largest refractive index value that super sheet of material has, n
MinThe minimum refractive index value that has for super sheet of material.
Further, described super sheet of material also comprises overlayer, and described overlayer material is identical with described base material material, makes by FR-4, F4B or PS material.
Further, the super material of described flat board also comprises four layer impedance matching layers, and wherein the index distribution of outermost layer impedance matching layer is even, is n
1=n
MinInferior outer impedance matching layer index distribution n
2(x, y)=n
Min* (n
1(x, y)/n
Min) ^ (1/4); Inferior internal layer impedance matching layer index distribution n
3(x, y)=n
Min* (n
1(x, y)/n
Min) ^ (2/4); Innermost layer impedance matching layer refraction distribution n
4(x, y)=n
Min* (n
1(x, y)/n
Min) ^ (3/4); Described innermost layer impedance matching layer is close to described super sheet of material setting.
Further, the super material of described flat board comprises two-layer super sheet of material, and each super sheet of material is identical with each impedance matching layer thickness, constitutes by the microstructure of the overlayer of 0.5 millimeter thickness, 0.018 millimeter thickness and the base material of 0.5 millimeter thickness.
Further, described artificial microstructure is artificial metal micro structure, and described artificial metal's microstructure is attached on the described base material by etching, plating, brill quarter, photoetching, electronics is carved or ion is carved method.
Further, described metal micro structure topology pattern is isotropy.
Further, described metal micro structure is the plane flakes, described metal micro structure has first metal wire and second metal wire of vertically dividing equally mutually, described first metal wire is identical with the length of second metal wire, the described first metal wire two ends are connected with two first metal branches of equal length, the described first metal wire two ends are connected on the mid point of two first metal branches, the described second metal wire two ends are connected with two second metal branches of equal length, the described second metal wire two ends are connected on the mid point of two second metal branches, the equal in length of the described first metal branch and the second metal branch.
Further, each first metal branch of the alabastrine metal micro structure in described plane and the two ends of each second metal branch also are connected with identical the 3rd metal branch, and the mid point of corresponding the 3rd metal branch links to each other with the end points of the first metal branch and the second metal branch respectively.
Further, first metal wire of the alabastrine metal micro structure in described plane and second metal wire are provided with two kinks, and the alabastrine metal micro structure in described plane winds and revolves the figure that turn 90 degrees with the axis of the second metal wire intersection point to any direction perpendicular to first metal wire and all overlap with former figure.
Further, described tuner axis of symmetry and surface level angle θ are 53 °, and the angle of elevation alpha of described satellite is 37.47 °, the y coordinate figure h of the intersection point of tuner axis of symmetry and dull and stereotyped super material front surface
1Be 264.5mm, tuner bore face central point is at the y of the subpoint of the super material plane of flat board coordinate figure h
2Be-3mm, tuner phase center point and tuner bore face central point apart from d
sBe-1.2 millimeters, d
sNegative sign value representation phase center point drop on the tuner outside; Super sheet of material refractive index minimum value n
MinBe 1.6355, super sheet of material refractive index maximal value n
MaxBe 5.51.
The present invention adopts the dull and stereotyped super material satellite antenna of super material principle preparation, and make itself and existing advertisement display well assemble one, make advertisement display to change display frame in real time according to satellite-signal, need not manually to pull down display device and set firmly new picture again.Simultaneously, the present invention is based on that the ad display screen preparation technology of super material satellite antenna is simple, with low cost, volume is little, be convenient to installation and maintenance.
Description of drawings
Fig. 1 is the structural representation of the elementary cell of the super material of formation;
Fig. 2 is the structural representation that the present invention is based on the ad display screen of super material satellite antenna;
Fig. 3 is the structural representation for super material satellite antenna system in the ad display screen that the present invention is based on super material satellite antenna;
Fig. 4 is the synoptic diagram of super material satellite antenna system on the zoy plane;
Fig. 5 is the topological pattern of the artificial microstructure in one embodiment of the invention;
Fig. 6 is a kind of derived structure of topological pattern shown in Figure 5;
Fig. 7 is a kind of distressed structure of topological pattern shown in Figure 5;
Fig. 8 is the phase one that the topology of the alabastrine metal micro structure in plane develops;
Fig. 9 is the subordinate phase that the topology of the alabastrine metal micro structure in plane develops;
Figure 10 is far field dB value test result figure.
Embodiment
Light, as electromagnetic a kind of, it is when passing glass, because the wavelength of light is much larger than the size of atom, therefore we can use the univers parameter of glass, and the details parameter of the atom of for example refractive index, rather than composition glass is described glass to the response of light.Accordingly, when research material was to other electromagnetic responses, any yardstick also can be with the univers parameter of material to electromagnetic response much smaller than the structure of electromagnetic wavelength in the material, and for example DIELECTRIC CONSTANT and magnetic permeability μ describe.The structure by every of designing material makes that all thereby the identical or different specific inductive capacity that makes material monolithic and magnetic permeability are certain rule and arrange for specific inductive capacity and the magnetic permeability of material each point, the magnetic permeability that rule is arranged and specific inductive capacity can make material that electromagnetic wave is had response on the macroscopic view, for example converge electromagnetic wave, divergent electromagnetic ripple etc.Such have magnetic permeability that rule arranges and specific inductive capacity material we be referred to as super material.
As shown in Figure 1, Fig. 1 is the perspective view of the elementary cell of the super material of formation.The elementary cell of super material comprises the base material 1 that artificial microstructure 2 and this artificial microstructure are adhered to.Among the present invention, artificial microstructure is artificial metal micro structure, artificial metal's microstructure has and can produce plane or the three-dimensional topological structure of response to incident electromagnetic wave electric field and/or magnetic field, and the pattern and/or the size that change the artificial metal's microstructure on each super material elementary cell can change each super material elementary cell to the response of incident electromagnetic wave.Among the present invention, also be coated with overlayer 3 on the artificial microstructure 2, overlayer 3, artificial microstructure 2 and base material 1 constitute the elementary cell of the super material of the present invention.A plurality of super material elementary cells are arranged according to certain rules and can be made super material electromagnetic wave be had the response of macroscopic view.Because super material monolithic needs have macroscopical electromagnetic response so each super material elementary cell need form continuous response to the response of incident electromagnetic wave to incident electromagnetic wave, this size that requires each super material elementary cell is preferably 1/10th of incident electromagnetic wave wavelength less than 1/5th of incident electromagnetic wave wavelength.During this section is described, the material monolithic that will surpass that we are artificial is divided into a plurality of super material elementary cells, but should know that this kind division methods only for convenience of description, should not regard super material as by a plurality of super material elementary cells splicings or assemble, super material is that artificial metal's microstructure cycle is arranged on the base material and can constitutes in the practical application, and technology is simple and with low cost.Cycle arranges and refers to that namely the artificial metal's microstructure on above-mentioned our artificial each super material elementary cell of dividing can produce continuous electromagnetic response to incident electromagnetic wave.
The present invention namely utilizes above-mentioned super material principle to design a kind of flat super material satellite antenna, and it can meet or exceed the performance of the existing satellite antenna that is made of the reflecting surface of parabolic shape.And flat super material satellite antenna volume is less, can well gather to constitute the ad display screen that the present invention is based on super material satellite antenna with flat display device, feasible routes such as all kinds of highways, city highway or track other display screen energy receiving satellite signal and real-time update and the broadcast advertising message of being set up in, advertisement owner or the ad display screen owner need not display screen is taken off burning advertising message again when needs are changed advertising message.
As shown in Figures 2 and 3, Fig. 2 is the structural representation that the present invention is based on the ad display screen of super material satellite antenna, and Fig. 3 is the structural representation that the present invention is based on super material satellite antenna system 10 in the ad display screen of super material satellite antenna.The ad display screen that the present invention is based on super material satellite antenna comprises ad display screen back up pad 30, is fixedly arranged on the one or more display device 20 on the ad display screen back up pad 30, and super material satellite antenna system 10.Can set firmly a plurality of display device 20 on the ad display screen back up pad 30, each display device 20 can correspondence one be overlapped super material satellite antenna system in order to show different ad contents, also can a plurality of display device 20 corresponding overlap super material satellite antenna system, make a plurality of display device 20 all show identical ad content, make the beholder all can see ad content from different orientation and angle.Display device 20 can be various display screens such as LED display, LCD display, plasma panel.
Super material satellite antenna system 10 comprises for receiving satellite signal and with the satellite-signal frequency reducing and the tuner 11 of amplification, the super material 12 of flat board of horizontal positioned, the reflecting plate (not shown) that is positioned at the super material of flat board 12 backs and the support 13 that is used for supporting tuner 11 that receive.Support 13 can be fixed on the dull and stereotyped super material 12 by an end, and the other end supports tuner 11, also can be fixed on ground or the display device by an end, and the other end supports tuner 11.The metallic reflection plate that reflecting plate can adopt each metalloid to make is as long as it can reach the function of reflection electromagnetic wave.
Below discuss in detail the design of dull and stereotyped super material 12 and tuner 11.Because the super material 12 of flat board of horizontal positioned is that the plane wave that satellite sends is converged in the tuner, by tuner plane wave signal is carried out frequency reducing and amplifies processing.Herein, the initial electromagnetic wave of satellite radiation is actual to be spherical wave, but extremely far away because of the super material 12 of satellite anomaly plate, when the spherical wave that sends when satellite arrived dull and stereotyped super material 12, the sphere electromagnetic wave can be regarded as plane electromagnetic wave.In emulation testing and computation process, reversibility according to the electromagnetic wave travel path, utilize and to launch electromagnetic emitting antenna, for example feed or primary radiator etc. replace tuner, in the present embodiment, when emulation testing and calculating, adopt feed to replace tuner, the sphere electromagnetic wave that the feed radiation frequency is identical with the wave frequency of satellite radiation and the spherical wave of feed radiation radiate after being converted to plane electromagnetic wave by the super material 12 of flat board, and the far field parameters of the plane electromagnetic wave after test is changed by dull and stereotyped super material 12 can be determined the performance of super material satellite antenna receiving satellite signal in the actual motion.
Please continue with reference to Fig. 3.Dull and stereotyped super material can be made of the identical super sheet of material of one or more pieces index distribution.Among Fig. 3, the super sheet of material of one deck only is shown and the super sheet of material of this one deck is considered as dull and stereotyped super material.Among Fig. 3, adopt feed 11 ' to replace tuner to carry out simulation calculation.Among Fig. 3, will be designated as dull and stereotyped super material front surface near the dull and stereotyped super material surface of a side of feed, the opposite side relative with front surface is designated as dull and stereotyped super material rear surface, the also back of namely dull and stereotyped super material.Initial point 0 (0,0,0) is positioned at the dull and stereotyped super material front surface lower left corner.Plane, dull and stereotyped super material place is the xoy plane, wherein, one side on the dull and stereotyped super material close feed be designated as the x axle, be designated as the y axle perpendicular to the another side of x axle, and the z axle is perpendicular to the xoy plane.
As shown in Figure 4, Fig. 4 is the synoptic diagram of super material satellite antenna system on the zoy plane.Among Fig. 4, feed 11 ' is tilted to down placement, and its axis of symmetry points to dull and stereotyped super material surface and axis of symmetry and dull and stereotyped super material surface angulation and is designated as θ.Feed 11 ' axis of symmetry is h with the y coordinate figure of the intersection point of dull and stereotyped super material front surface
1, feed 11 ' bore face central point is h at the y of the subpoint of the super material plane of flat board coordinate figure
2, the phase center point A (x of feed 11 '
1, y
1, z
1) be positioned on the feed 11 ' axis of symmetry, the distance of itself and feed bore face central point is designated as d
sθ, h
1, h
2Be adjustable parameter, under the situation that other conditions are determined, can make that super material satellite antenna system has best performance by regulating those parameters.In addition, because in same geographic coverage, the azimuthal angle beta of same satellite and angle of elevation alpha are all fixing, electromagnetic wave by feed 11 ' emission, after dull and stereotyped super material modulation, its outgoing beam position satellite also is that the angle of outgoing wave beam and dull and stereotyped super material plane is satellite in the angle of elevation alpha of this area.And the line of feed and satellite is satellite in the azimuthal angle beta on this ground in the projection of surface level and the drift angle of direct north.
Please referring again to Fig. 3.In the present embodiment, the length and width of dull and stereotyped super material are L.The axis of symmetry of feed or tuner overlaps with the x=L/2 straight line in the projection on xoy plane.By Fig. 3 and Fig. 4 as can be known, the phase center point A (x of feed 11 '
1, y
1, z
1) coordinate figure be:
As shown in Figure 3, the index distribution of super sheet of material is only relevant with x, y value, and therefore no change on the z direction is true origin with the super sheet of material lower left corner, the index distribution n of super sheet of material (x y) can draw by following formula:
In the following formula,
d
2＝cosα*(L-y)；
ss＝cosα*(L-y
1)
2+sinα*(z
1)
2；
x
1＝L/2；
y
1＝-h
2-d
s*cosθ；
z
1＝(h
1+h
2)*tanθ+d
s*sinθ；
Wherein, the downward value function of floor function representation, θ are feed or tuner axis of symmetry and horizontal plane angle, and α is the satellite elevation angle, h
1Be feed or the tuner axis of symmetry y coordinate figure with the intersection point of dull and stereotyped super material front surface, h
2For feed or tuner bore face central point at the y of the subpoint of the super material plane of flat board coordinate figure, L is the total length of dull and stereotyped super material, d
sBe the distance of feed or tuner phase center point and feed or tuner bore face central point, λ is the electromagnetic wavelength of satellite radiation, is the wave frequency of feed radiation when simulation calculation, n
MaxBe the largest refractive index value that super sheet of material has, n
MinThe minimum refractive index value that has for super sheet of material.
By the index distribution formula of above-mentioned super sheet of material as can be known, the refractive index of super sheet of material is that rotational symmetry distributes, and axis of symmetry is straight line x=L/2.Feed or tuner axis of symmetry also overlap with this refractive index axis of symmetry in the projection on super sheet of material plane.
After determining the index distribution of super sheet of material, need be on the super material elementary cell that virtual division on the super sheet of material is come out the cycle artificial microstructure of arranging, changing the refractive index value of every of super sheet of material, thereby make that super sheet of material obtains above-mentioned index distribution.The topology of artificial microstructure and size can influence the refractive index value of its super material elementary cell of adhering to, and in this step, can adopt the mass computing mode to choose topology and the size of suitable artificial microstructure from database.The largest refractive index value of dull and stereotyped super material and the requirement of minimum refractive index value are satisfied in the requirement that the artificial microstructure of choosing need satisfy each point index distribution value on the one hand also needs.As shown in Figure 5, it is the topological pattern of the artificial microstructure in one embodiment of the invention.This artificial microstructure topological structure is for being isotropic plane snowflake type.Isotropy refer to along the microstructure central point with microstructure on plane, microstructure place, all overlap with original pattern by the new pattern that obtains behind any direction half-twist.Adopt isotropic microstructure energy simplified design, its electromagnetic wave to all directions of vertical microstructure place plane incident all has identical electromagnetic response, has good consistance.
The microstructure of plane snowflake type has the first metal wire J1 and the second metal wire J2 that vertically divides equally mutually, the described first metal wire J1 is identical with the length of the second metal wire J2, the described first metal wire J1 two ends are connected with two first F1 of metal branch of equal length, the described first metal wire J1 two ends are connected on the mid point of two first F1 of metal branch, the described second metal wire J2 two ends are connected with two second F2 of metal branch of equal length, the described second metal wire J2 two ends are connected on the mid point of two second F2 of metal branch, the equal in length of described first F1 of metal branch and second F2 of metal branch.
Fig. 6 is a kind of derived structure of the alabastrine metal micro structure in plane shown in Figure 5.Its two ends at each first F1 of metal branch and each second F2 of metal branch all are connected with identical the 3rd F3 of metal branch, and the mid point of corresponding the 3rd F3 of metal branch links to each other with the end points of first F1 of metal branch and second F2 of metal branch respectively.The rest may be inferred, and the present invention can also derive the metal micro structure of other form.
Fig. 7 is a kind of distressed structure of the alabastrine metal micro structure in plane shown in Figure 5, the metal micro structure of this kind structure, the first metal wire J1 and the second metal wire J2 are not straight lines, but folding line, the first metal wire J1 and the second metal wire J2 are provided with two kink WZ, but the first metal wire J1 remains vertical with the second metal wire J2 to be divided equally, by arrange kink towards with the relative position of kink on first metal wire and second metal wire, make metal micro structure shown in Figure 7 wind to revolve the figure that turn 90 degrees with the axis of the second metal wire intersection point to any direction perpendicular to first metal wire all to overlap with former figure.In addition, other distortion can also be arranged, for example, the first metal wire J1 and the second metal wire J2 all arrange a plurality of kink WZ.
After obtaining the concrete topological pattern of microstructure, can obtain the index distribution of whole super sheet of material by the mode that microstructure is proportionally dwindled, amplified, also can be by being fundamental figure with a concrete micro structured pattern, to obtain the index distribution of whole super sheet of material by the mode that develops the acquisition fundamental figure.Below to introduce with the plane snowflake type in detail be fundamental figure, obtain the concrete steps of super sheet of material index distribution by the differentiation mode:
(1) determines the base material that adheres to of microstructure.When super material elementary cell also comprised overlayer, tectal material was identical with the base material material.The base material material can be chosen FR-4, F4B or PS material, no matter chooses which kind of material, all can determine the refractive index value of base material.Among the present invention, the base material that the PS material of the overlayer that the super sheet of material of individual layer is made by the PS material of 0.5 millimeter thickness, the microstructure of 0.018 millimeter thickness and 0.5 millimeter thickness is made constitutes, and the super sheet of material thickness of individual layer is 1.018 millimeters.
(2) size of definite super material cell.The size of super material cell is obtained by the centre frequency of satellite, utilizes frequency to obtain its wavelength, gets less than numerical value of 1/5th of wavelength length C D and width KD as super material cell D again.Among the present invention, the frequency of operation of satellite antenna is 11.7-12.2GHZ, adopts the centre frequency of 11.95GHZ during design.The length C D of described super material cell D and width KD are 2.8 millimeters.
(3) determine material and the topological structure of microstructure.In the present embodiment, the material of microstructure is copper, and the topological structure of microstructure is the alabastrine metal micro structure in plane shown in Figure 5, and its live width W is consistent everywhere; Topological structure herein refers to the fundamental figure that topology develops.
(4) determine the topology parameter of metal micro structure.As shown in Figure 5, among the present invention, the topology parameter of the alabastrine metal micro structure in plane comprises the live width W of metal micro structure, the length a of the first metal wire J1, the length b of first F1 of metal branch.
(5) determine the differentiation restrictive condition of the topology of metal micro structure.Among the present invention, the differentiation restrictive condition of the topology of metal micro structure has, the minimum spacing WL between the metal micro structure (namely as shown in Figure 5, the distance of the long limit of metal micro structure and super material cell or broadside is WL/2), the live width W of metal micro structure, the size of super material cell; Because the processing technology restriction, WL is more than or equal to 0.1mm, and same, live width W is greater than to equal 0.1mm.In the present embodiment, WL gets 0.1mm, and W gets 0.3mm, and super material cell is of a size of the long and wide 2.8mm that is, this moment, the topology parameter of metal micro structure had only a and two variablees of b.The passing through as Fig. 8 of the topology of metal micro structure corresponding to a certain characteristic frequency (for example 11.95GHZ), can obtain a continuous variations in refractive index scope to differentiation mode shown in Figure 9.
Particularly, the differentiation of the topology of described metal micro structure comprises two stages (fundamental figure that topology develops is metal micro structure shown in Figure 5):
Phase one: according to developing restrictive condition, under the situation that the b value remains unchanged, a value is changed to maximal value from minimum value, the metal micro structure in this evolution process is " ten " font (except when a gets minimum value).In the present embodiment, the minimum value of a is 0.3mm (live width W), and the maximal value of a is (CD-WL), i.e. 2.8-0.1mm, and then the maximal value of a is 2.7mm.Therefore, in the phase one, the differentiation of the topology of metal micro structure as shown in figure 10, it namely is square J * 1 of W from the length of side, develop into maximum " ten " font topology JD1 gradually, in " ten " font topology JD1 of maximum, the first metal wire J1 and the second metal wire J2 length are 2.7mm, and width W is 0.3mm.In the phase one, along with the differentiation of the topology of metal micro structure, the refractive index of the super material cell corresponding with it increase continuously ((respective antenna one characteristic frequency), when frequency is 11.95GHZ, the minimum value n of the refractive index of super material cell correspondence
MinBe 1.6355.
Subordinate phase: according to developing restrictive condition, when a was increased to maximal value, a remained unchanged; At this moment, b is increased continuously maximal value from minimum value, the metal micro structure in this evolution process is the plane flakes.In the present embodiment, the minimum value of b is 0.3mm(live width W), the maximal value of b is (CD-WL-2W), i.e. 2.8-0.1-2*0.3mm, then the maximal value of b is 2.1mm.Therefore, in subordinate phase, the differentiation of the topology of metal micro structure as shown in Figure 9, namely from " ten " font topology JD1 of maximum, develop into the maximum alabastrine topology JD2 in plane gradually, the alabastrine topology JD2 in the plane of maximum herein refers to that the length b of first J1 of metal branch and second J2 of metal branch can not extend again, otherwise the first metal branch and the second metal branch will take place to intersect, and the maximal value of b is 2.1mm.At this moment, first metal wire and the second metal wire length are 2.7mm, and width is 0.3mm, and the length of the first metal branch and the second metal branch is 2.1mm, and width is 0.3mm.In subordinate phase, along with the differentiation of the topology of metal micro structure, the refractive index of the super material cell corresponding with it increases (respective antenna one characteristic frequency) continuously, when frequency is 11.95GHZ, and the maximal value n of the refractive index of super material cell correspondence
MaxBe 5.7174, the present invention only gets 5.51 largest refractive index when design.
In the evolution process of above-mentioned phase one and subordinate phase, need all to guarantee that the topological pattern of the microstructure in the evolution process is isotropic topological pattern.
The variations in refractive index scope (1.6355-5.7174) that obtains super material cell by above-mentioned differentiation satisfies the design needs.Do not satisfy the design needs if above-mentioned differentiation obtains the variations in refractive index scope of super material cell, for example maximal value is too little, then changes WL and W, and emulation again is up to obtaining the variations in refractive index scope that we need.
Obtain the index distribution of super sheet of material by above-mentioned design, behind the topological structure and size of the artificial microstructure of realization index distribution, in order to reduce to incide the electromagnetic wave on the super material because the reflection loss that the refractive index sudden change causes can also arrange the multilayer impedance matching layer on super sheet of material surface.Impedance matching layer also can adopt the method design of the super sheet of material of above-mentioned design, and difference is, the gradually changed refractive index of each layer impedance matching layer.The gradually changed refractive index of each layer impedance matching layer to the mode of the index distribution of super sheet of material can be linear distribution gradual manner, power value distribution gradual manner, binomial distribution gradual manner or Chebyshev's gradual manner etc.
Determine the parameter of the super material satellite antenna of the present invention below, and test under those parameters the performance of super material satellite antenna.In the present embodiment, dull and stereotyped super material adopts the super material of band impedance matching layer, is made of 2 layers of super sheet of material and 4 layer impedance matching layers, and dull and stereotyped super material front is of a size of 600mm * 600mm, and thickness is 1.018 * 6=6.108mm.Can be found out also that by this size the volume of the super material satellite antenna of the present invention is little, be easy to carry about with one, be easy to install.53 ° of feed axis of symmetry and surface level angle θ values, testing selected satellite is No. nine satellites of culminant star of Beijing area, the angle of elevation alpha of this satellite is 37.47 °, the y coordinate figure h of the intersection point of feed or tuner axis of symmetry and dull and stereotyped super material front surface
1Be 264.5mm, feed or tuner bore face central point are at the y of the subpoint of the super material plane of flat board coordinate figure h
2Be-3mm, feed or tuner phase center point and feed or tuner bore face central point apart from d
sBe-1.2 millimeters, d
sNegative sign value representation phase center point drop on feed or tuner outside.Super sheet of material refractive index minimum value n
MinBe 1.6355, super sheet of material refractive index maximal value n
MaxBe 5.51.The index distribution of four layer impedance matching layers adopts following formula to determine:
Outermost layer impedance matching layer index distribution n
1=n
Min, also be that the index distribution of outermost layer impedance matching layer is even, be n
Min, inferior outer impedance matching layer index distribution n
2(x, y)=n
Min* (n1 (x, y)/n
Min) ^ (1/4); Inferior internal layer impedance matching layer index distribution n
3(x, y)=n
Min* (n
1(x, y)/n
Min) ^ (2/4); Innermost layer impedance matching layer refraction distribution n
4(x, y)=n
Min* (n
1(x, y)/n
Min) ^ (3/4).Wherein, the innermost layer impedance matching layer is close to super sheet of material setting.
Utilize simulation result that above-mentioned parameter obtains as shown in figure 10.Figure 10 is the far field dB value test result figure of the super material satellite antenna of the present invention.As can be known from Fig. 10, the electromagnetic wave of feed radiation is about 37 ° of direction places at shooting angle and has maximum far field value, and maximum far field value reaches about 35dB after modulating through dull and stereotyped super material.And in the emulation, the angle of elevation alpha of No. nine satellites of Beijing area culminant star is 37.47 °, therefore can instead release, and when adopting tuner to receive the signal of this satellite emission, also has best performance.
By reference to the accompanying drawings embodiments of the invention are described above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment only is schematic; rather than it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not breaking away under the scope situation that aim of the present invention and claim protect, also can make a lot of forms, these all belong within the protection of the present invention.
Claims (11)
1. the ad display screen based on super material satellite antenna is characterized in that: comprise the super material satellite antenna system for receiving satellite signal, be used for showing the display device of advertising message; Described super material satellite antenna system comprises tuner, the super material of the flat board of horizontal positioned and the reflecting plate that is positioned at the super material of described flat board rear surface, the super material of described flat board comprises the super sheet of material of multilayer, every layer of super sheet of material comprises that base material and cycle are arranged in the artificial microstructure on the base material, described super sheet of material refractive index is that axis of symmetry becomes rotational symmetry to distribute with one bar axis, described tuner is tilted to down placement, and described tuner axis of symmetry points to the super material of described flat board and the described tuner axis of symmetry overlaps with the refractive index axis of symmetry of described super sheet of material in the projection of described super sheet of material.
2. ad display screen as claimed in claim 1, it is characterized in that: be described super sheet of material front surface near the super sheet of material of the first side of described high frequency surface, the opposite side surface relative with described front surface is described super sheet of material rear surface, described super sheet of material front surface is the x axle near one side of feed, another side perpendicular to the x axle is the y axle, initial point is positioned at the described super sheet of material front surface lower left corner, the index distribution n of described super sheet of material (x, y) satisfy following formula:
d
2＝cosα*(L-y)；
ss＝cosα*(L-y
1)
2+sinα*(z
1)
2；
y
1＝-h
2-d
s*cosθ；
z
1＝(h
1+h
2)*tanθ+d
s*sinθ；
Wherein, the downward value function of floor function representation, θ is tuner axis of symmetry and horizontal plane angle, α is the satellite elevation angle, h
1Be the y coordinate figure of the intersection point of tuner axis of symmetry and described super sheet of material front surface, h
2Be the y coordinate figure of tuner bore face central point at the subpoint on described super sheet of material plane, L is the total length of dull and stereotyped super material, d
sBe the distance of tuner phase center point with tuner bore face central point, λ is the electromagnetic wavelength of satellite radiation, n
MaxBe the largest refractive index value that super sheet of material has, n
MinThe minimum refractive index value that has for super sheet of material.
3. ad display screen as claimed in claim 2, it is characterized in that: described super sheet of material also comprises overlayer, described overlayer material is identical with described base material material, makes by FR-4, F4B or PS material.
4. ad display screen as claimed in claim 2, it is characterized in that: the super material of described flat board also comprises four layer impedance matching layers, and wherein the index distribution of outermost layer impedance matching layer is even, is n
1=n
MinInferior outer impedance matching layer index distribution n
2(x, y)=n
Min* (n
1(x, y)/n
Min) ^ (1/4); Inferior internal layer impedance matching layer index distribution n
3(x, y)=n
Min* (n
1(x, y)/n
Min) ^ (2/4); Innermost layer impedance matching layer refraction distribution n
4(x, y)=n
Min* (n
1(x, y)/n
Min) ^ (3/4); Described innermost layer impedance matching layer is close to described super sheet of material setting.
5. ad display screen as claimed in claim 4, it is characterized in that: the super material of described flat board comprises two-layer super sheet of material, each super sheet of material is identical with each impedance matching layer thickness, constitutes by the microstructure of the overlayer of 0.5 millimeter thickness, 0.018 millimeter thickness and the base material of 0.5 millimeter thickness.
6. ad display screen as claimed in claim 2, it is characterized in that: described artificial microstructure is artificial metal micro structure, described artificial metal's microstructure is attached on the described base material by etching, plating, brill quarter, photoetching, electronics is carved or ion is carved method.
7. ad display screen as claimed in claim 6 is characterized in that: described metal micro structure topology pattern is isotropy.
8. ad display screen as claimed in claim 7, it is characterized in that: described metal micro structure is the plane flakes, described metal micro structure has first metal wire and second metal wire of vertically dividing equally mutually, described first metal wire is identical with the length of second metal wire, the described first metal wire two ends are connected with two first metal branches of equal length, the described first metal wire two ends are connected on the mid point of two first metal branches, the described second metal wire two ends are connected with two second metal branches of equal length, the described second metal wire two ends are connected on the mid point of two second metal branches, the equal in length of the described first metal branch and the second metal branch.
9. ad display screen as claimed in claim 7, it is characterized in that: each first metal branch of the alabastrine metal micro structure in described plane and the two ends of each second metal branch also are connected with identical the 3rd metal branch, and the mid point of corresponding the 3rd metal branch links to each other with the end points of the first metal branch and the second metal branch respectively.
10. ad display screen as claimed in claim 7, it is characterized in that: first metal wire of the alabastrine metal micro structure in described plane and second metal wire are provided with two kinks, and the alabastrine metal micro structure in described plane winds and revolves the figure that turn 90 degrees with the axis of the second metal wire intersection point to any direction perpendicular to first metal wire and all overlap with former figure.
11. ad display screen as claimed in claim 5 is characterized in that: described tuner axis of symmetry and surface level angle θ are 53 °, and the angle of elevation alpha of described satellite is 37.47 °, the y coordinate figure h of the intersection point of tuner axis of symmetry and dull and stereotyped super material front surface
1Be 264.5mm, tuner bore face central point is at the y of the subpoint of the super material plane of flat board coordinate figure h
2Be-3mm, tuner phase center point and tuner bore face central point apart from d
sBe-1.2 millimeters, d
sNegative sign value representation phase center point drop on the tuner outside; Super sheet of material refractive index minimum value n
MinBe 1.6355, super sheet of material refractive index maximal value n
MaxBe 5.51.
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| CN105958209A (en) * | 2016-07-05 | 2016-09-21 | 中国矿业大学(北京) | Double-incident type electromagnetic metamaterial structure |
| CN111755797A (en) * | 2019-03-28 | 2020-10-09 | 中国航天科工飞航技术研究院（中国航天海鹰机电技术研究院） | Short wave antenna device based on non-metal material highway facility and implementation method |
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| CN111755797B (en) * | 2019-03-28 | 2022-02-08 | 中国航天科工飞航技术研究院（中国航天海鹰机电技术研究院） | Short wave antenna device based on non-metal material highway facility and implementation method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103295474B (en) | 2016-12-14 |
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