CN104218325B - A kind of effective dielectric constant and the artificial electromagnetic material of magnetic conductivity nearly zero - Google Patents
A kind of effective dielectric constant and the artificial electromagnetic material of magnetic conductivity nearly zero Download PDFInfo
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- CN104218325B CN104218325B CN201410468352.XA CN201410468352A CN104218325B CN 104218325 B CN104218325 B CN 104218325B CN 201410468352 A CN201410468352 A CN 201410468352A CN 104218325 B CN104218325 B CN 104218325B
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Abstract
The present invention discloses a kind of effective dielectric constant and the artificial electromagnetic material of magnetic conductivity nearly zero, and including medium substrate 5, medium substrate 5 uses double-sided copper-clad, the upper surface etching fishing net shape metal grate 1 of medium substrate 5；Medium substrate 5 lower surface etching fishing net shape metal grate 2, etches metal chip unit 3 at each clear central of metal grate 2；The surrounding of medium substrate 5 is arranged with thin metal layer fence 4, and thin metal layer fence 4 is connected with fishing net shape metal grate 1 and fishing net shape metal grate 2.The present invention realizes relative dielectric constant and magnetic conductivity nearly zero in same microwave frequency, change the shape of metal patch unit 3, controllable relative dielectric constant and the frequency of magnetic conductivity nearly zero, for building the fields such as waveguide coupler, the directionality strengthening aerial radiation and wavefront shaping.
Description
Technical field
The invention belongs to electronic technology field, a kind of equivalence further related in electromagnetic material technical field is situated between
Electric constant and the artificial electromagnetic material of magnetic conductivity nearly zero.It is normal that the present invention can realize relative dielectric in same microwave frequency
Number and magnetic conductivity nearly zero, for building the necks such as waveguide coupler, the directionality strengthening aerial radiation and wavefront shaping
Territory.
Background technology
Electromagnetism Meta Materials (Metamaterials) be also novel artificial electromagnetic media, refers in nature own
Do not exist, but constructed according to electromagnetic theory engineer, there is the artificial of unconventional electromagnetism
Medium or structure.Meta Materials has been widely used in High-directivity antenna, stealthy because of its Strange properties being had
The numerous areas such as technology, radar and microwave and millimeter wave device design.Meanwhile, the research to Meta Materials is also covered by
The a series of subjects such as Materials Science and Engineering, microwave antenna are theoretical, electromagnetic theory and advanced measurement.
Zero refraction materials is that relative index of refraction is zero or is approximately a kind of Novel manual electromagnetic material of zero, electromagnetism
Ripple can show many unique phenomenons when propagating in zero refraction materials, as phase place is changed to zero, surpasses coupling
Effect and electromagnetism tunnelling etc., this is for building waveguide coupler, the directionality strengthening aerial radiation and wavefront shaping
Etc. having broad application prospects.
The coating of antenna is by placing artificial electromagnetic material or structure above antenna to reach to improve original sky
The purpose of line gain.Nearly zero refraction materials has the effect of wavefront shaping because of it to electromagnetic wave, as sky
The coating of line, the Aperture field distribution of energy Effective Regulation antenna, it is achieved the outgoing field of almost plane ripple, it is possible to effectively
The radiation lobe of compression antenna, converges the radiant power of antenna, thus improves the gain of antenna.Research shows,
Nearly zero refraction materials of electricity, as the coating of antenna, can only be effectively compressed the radiated wave in electric field place plane (E face)
Lobe width；And nearly zero refraction materials of magnetic is as the coating of antenna, place, magnetic field plane (H can only be effectively compressed
Face) radiation lobe width, both of which can not reach optimal gain and improve effect.
Patented technology " the microwave power synthesis system of zero index lens and composition thereof the " (Shen that Sichuan University has
Please number: 201210073795, authorize publication No.: 102593605B) in disclose a kind of zero index lens
And the microwave power synthesis system being made up of this zero index lens.This system includes zero index lens and extremely
Few 2 antenna for radiating microwave, antenna for radiating microwave is launched micro-by described zero index lens to same direction
Ripple.Although it is simple that this microwave power synthesis system has system architecture, flexible configuration, the advantage that system cost is low.
But, the weak point that this system yet suffers from has 2 points, and first, zero index lens thickness of this system is
The integral multiple of half operation wavelength, the overall section of system is bigger, is unfavorable for the actual application of system.Second,
This microwave power synthesis system can not compress E face and the H face of antenna for radiating microwave directional diagram simultaneously, to former sky
Line gain improves limited.
Patented technology that Jiangsu University has " a kind of has nearly zero index of refraction effects and the rectangle of left-handedness effect simultaneously
Frame fractal antenna " (application number: 201320514042.8, Authorization Notice No.: 203617428U) discloses
A kind of rectangle frame fractal antenna with nearly zero index of refraction effects and left-handedness effect.This rectangle frame fractal antenna
Including three layers of medium substrate, metal ground plate, rectangle frame fractal metal radiation paster, microstrip feed line, rectangle gold
Belong to resonant ring.The medium substrate of this composite construction has three layers, and first and third layer of relative dielectric constant is 10, the
Two layers of relative dielectric constant are 2.2.Driving source uses Gaussian discrete source, by microstrip feed line to paster
Antenna feeds.Although the localization degree of the electromagnetic energy of this antenna is significantly improved, wave beam is produced and converges
Poly-effect, causes antenna gain to significantly increase, and shows as relatively low return loss.But, this rectangle frame divides
Shape antenna has 2 weak points, and first, this antenna uses 3 laminar substrates, and the topological structure of each layer is more complicated,
Requirement to processing technology is higher, and its thickness is 3 times of former paster antenna, loses that paster antenna is low to be cutd open
The advantage in face.Second, this antenna can not compress E face and the H face of former paster antenna directional diagram simultaneously, to former
Paster antenna gain improves limited.
In sum, current artificial electromagnetic material is faced with three problems,
One, the E face electric field of antenna is only played wavefront shaping by the artificial electromagnetic material of existing dielectric constant nearly zero
Effect, wavefront shaping operation is only played in the magnetic field, H face of antenna by the artificial electromagnetic material of existing magnetic conductivity nearly zero,
Improvement to antenna gain is limited.
Its two, existing artificial electromagnetic material relative permeability and relative dielectric constant be not at same frequency nearly zero, no
Can E face and H surface radiation directional diagram lobe to antenna be compressed, to the directionality system improving antenna simultaneously
Number is limited.
Its three, the structural topology of existing artificial electromagnetic material is complicated, makes relative dielectric constant and magnetic conductivity near with frequency
The artificial electromagnetic material design difficulty of zero is high, Project Realization is poor.
Summary of the invention
The present invention is directed to the deficiency that the artificial electromagnetic material of above-mentioned prior art faces, it is provided that a kind of dielectric relatively is normal
Number and the artificial electromagnetic material of magnetic conductivity nearly zero so that artificial electromagnetic material compresses antenna E face and H face simultaneously
Directional diagram, and meet antenna coating wave impedance and free space wave impedance matching condition.
For achieving the above object, technical scheme is as follows.
The present invention includes medium substrate, and medium substrate uses double-sided copper-clad, the upper surface etching fishing net of medium substrate
Shape metal grate；Medium substrate lower surface etching fishing net shape metal grate, at each clear central of metal grate
Place's etching metal chip unit；The surrounding of medium substrate is arranged with thin metal layer fence, and thin metal layer fence is with upper
The fishing net shape metal grate of lower surface is connected.
Invention compared with prior art has the advantage that
First, the present invention etches fishing net shape metal grate at medium substrate upper surface, carves at medium substrate lower surface
Erosion fishing net shape metal grate and metal patch so that artificial electromagnetic material has relative dielectric constant and magnetic conductivity is near
The feature of zero, overcomes the antenna coating of the only dielectric constant nearly zero that prior art the exists E face only to antenna
Electric field plays wavefront shaping operation, and antenna coating only magnetic field, the H face wave inception to antenna of only magnetic conductivity nearly zero
The shortcoming of front shaping operation so that the present invention is provided with compression antenna E face and H surface radiation directional diagram master simultaneously
The advantage of lobe, effectively increases the gain of antenna.
Second, the present invention, by lower surface etching fishing net shape metal grate and the structure of metal patch, overcomes existing
Artificial electromagnetic material relative permeability and relative dielectric constant not lacking at same frequency nearly zero with the presence of technology
Point, makes the present invention have with free space impedance and mates and reflect less advantage, effectively reduce coating antenna
Back lobe and section.
3rd, the present invention, by changing the shape and size of lower surface polygon metal patch, overcomes existing skill
The shortcoming that the artificial electromagnetic material relative permeability that art exists is fixing with relative dielectric constant nearly zero-frequency point, makes this
Bright have regulation and control relative dielectric constant and the advantage of relative permeability nearly zero-frequency point.
3rd, the artificial electromagnetic material in the present invention uses the medium substrate of double-sided copper-clad to make, and overcomes existing
Coating topological structure is complicated, makes the shortcoming that coating design difficulty is high, Project Realization is poor so that the present invention has
Design is simple, it is easy to the advantage of processing.
Accompanying drawing explanation
Fig. 1 is present configuration schematic diagram；
Fig. 2 is upper surface fishing net shape metal grate cell schematics of the present invention；
Fig. 3 is lower surface fishing net shape metal grate unit of the present invention and metal patch cell schematics；
Fig. 4 is that the relative dielectric constant real part of the embodiment of the present invention 1 and imaginary part are with frequency variation curve figure；
Fig. 5 is that the relative permeability real part of the embodiment of the present invention 1 and imaginary part are with frequency variation curve figure；
Fig. 6 is that the refractive index real part of the embodiment of the present invention 1 and imaginary part are with frequency variation curve figure；
Fig. 7 is that the embodiment of the present invention 1 is placed on schematic diagram above paster antenna；
Fig. 8 is the embodiment of the present invention 1 to the compression direction figure in paster antenna E face and direction, paster antenna E face
The comparison diagram of figure；
Fig. 9 is the embodiment of the present invention 1 to the compression direction figure in paster antenna H face and direction, paster antenna H face
The comparison diagram of figure.
Figure 10 is the structural representation of the embodiment of the present invention 2；
Figure 11 is that the relative dielectric constant real part of the embodiment of the present invention 2 and imaginary part are with frequency variation curve figure；
Figure 12 is that the relative permeability real part of the embodiment of the present invention 2 and imaginary part are with frequency variation curve figure；
Figure 13 is that the refractive index real part of the embodiment of the present invention 2 and imaginary part are with frequency variation curve figure；
Figure 14 is the structural representation of the embodiment of the present invention 3；
Figure 15 is that the relative dielectric constant real part of the embodiment of the present invention 3 and imaginary part are with frequency variation curve figure；
Figure 16 is that the relative permeability real part of the embodiment of the present invention 3 and imaginary part are with frequency variation curve figure；
Figure 17 is that the refractive index real part of the embodiment of the present invention 3 and imaginary part are with frequency variation curve figure.
Specific implementation
The invention will be further described below in conjunction with the accompanying drawings.
1, accompanying drawing 2 and accompanying drawing 3 referring to the drawings, the structure of the present invention is as follows.
The present invention includes that medium substrate 5, medium substrate 5 use double-sided copper-clad, the upper surface erosion of medium substrate 5
Carve fishing net shape metal grate 1.Medium substrate 5 lower surface etching fishing net shape metal grate 2, in metal grate 2
Each clear central at etch metal chip unit 3.The surrounding of medium substrate 5 is arranged with thin metal layer fence
4, thin metal layer fence 4 is connected with fishing net shape metal grate 1 and fishing net shape metal grate 2.
The relative dielectric constant of medium substrate 5 is between 2～10, and thickness is 0.5mm～3mm.
The upper surface fishing net shape metal grate 1 of medium substrate 5 is spaced two-by-two by N1 metal grate unit 6
5mm～20mm rearranges, and wherein N1 is positive integer, 2≤N1≤128, each metal grate unit 6
The width of middle grid is 0.1mm～1mm.
The lower surface fishing net shape metal grate 2 of medium substrate 5 is spaced two-by-two by N2 metal grate unit 7
3mm～8mm rearranges, and wherein N2 is positive integer, 2≤N2≤512, in each metal grate unit 7
The width of grid is 0.1mm～1mm.
Metal patch unit 3 be shaped as polygon or circle.
The thickness t of thin metal layer fence 4 be 0.01mm～1mm, highly l be 3mm～6mm.
Embodiments of the invention 1 are able to obtain relative dielectric constant and magnetic conductance near 10.8GHz frequency
Rate nearly zero time each physical dimension of being used as follows:
Medium substrate 5 relative dielectric constant of the embodiment of the present invention 1 is 2.65, and dielectric loss is 0.0015, thick
Degree is 1mm.Artificial electromagnetic material upper surface metal grate 1 is spaced two-by-two by 25 metal grate unit 6
12mm rearranges, and the raster width of each metal grate unit 6 is 0.3mm, lower surface metal grid 2
It is spaced 6mm two-by-two to rearrange by 100 metal grate unit 7, the grid of each metal grate unit 7
Width is 0.3mm, and the length of side of square metal chip unit 3 is 4.2mm, each two square metal chip unit
3 be spaced apart 6mm.The thickness t of thin metal layer fence 4 be 0.01mm, highly l be 4mm.
Fig. 4 is that the relative dielectric constant real part of the embodiment of the present invention 1 and imaginary part are with frequency variation curve figure.Implement
Relative dielectric constant real part and the imaginary part of example 1 are calculated by Matlab with frequency variation curve figure, abscissa
For frequency, ordinate is relative dielectric constant real part and imaginary part.Solid line is that relative dielectric constant real part becomes with frequency
Changing curve, dotted line is that relative dielectric constant imaginary part is with frequency variation curve.Relative dielectric constant from embodiment 1
Real part and imaginary part with frequency variation curve figure it can be seen that embodiment 1 can realize near 10.8GHz frequency
Relative dielectric constant real part and imaginary part nearly zero.
Fig. 5 is that the relative permeability real part of the embodiment of the present invention 1 and imaginary part are with frequency variation curve figure.Embodiment
Relative permeability real part and the imaginary part of 1 are calculated by Matlab with frequency variation curve figure, and abscissa is frequency
Rate, ordinate is relative permeability real part and imaginary part, solid line be relative permeability real part with frequency variation curve,
Dotted line is that relative permeability imaginary part is with frequency variation curve.From the relative permeability real part of embodiment 1 and imaginary part with
Frequency variation curve figure is it can be seen that embodiment 1 can realize relative permeability in fact near 10.8GHz frequency
Portion and imaginary part nearly zero.
Fig. 6 is that the refractive index real part of the embodiment of the present invention 1 and imaginary part are with frequency variation curve figure.Embodiment 1
Refractive index real part and imaginary part are calculated by Matlab with frequency variation curve figure, and abscissa is frequency, vertical seat
Be designated as refractive index real part and imaginary part, solid line be refractive index real part with frequency variation curve, dotted line is imaginary index
With frequency change song.From the refractive index real part of embodiment 1 and imaginary part with frequency variation curve figure it can be seen that reality
Execute example 1 and can realize refractive index real part and imaginary part nearly zero near 10.8GHz frequency.
Fig. 7 is the schematic diagram that the embodiment of the present invention 1 is arranged on above paster antenna as antenna coating.Paster sky
Line includes outside antenna medium substrates 8, aerial radiation structure 9, antenna floor 10, antenna SMA feed connection
Core 11, antenna SMA feed connection inner core 12.Antenna medium substrates 8 relative dielectric constant is 2.5, thickness
For 1mm, a size of 60mm × 60mm, aerial radiation structure 9 is positioned at the center of medium substrate 8, size
For the square patch of 7.3mm × 7.3mm, antenna floor 10 is 60mm × 60mm square patch, antenna SMA
Outer core 11 radius of feed connection is 0.875mm, and height is 1mm, antenna SMA feed connection inner core 12 half
Footpath is 0.375mm, and height is 2mm.Antenna SMA feed connection inner core 12 and aerial radiation structure 9 phase
Welding, pad is positioned at the left 1.5mm of aerial radiation structure 9 center.Embodiment 1 is arranged on paster sky
Above line at 9mm.
Fig. 8 is the embodiment of the present invention 1 to the antenna pattern in paster antenna E face and former paster antenna E face spoke
Penetrating the comparison diagram of directional diagram, the directional diagram of the present invention is calculated by full-wave simulation, and directional diagram uses polar coordinates table
Show, left side ordinate representative antennas far field radiation gain value in antenna pattern.From the embodiment of the present invention 1 to patch
The comparison diagram of the compression direction figure in chip antenna E face and former paster antenna E face directional diagram is it can be seen that embodiment 1
Having compression effectiveness, lobe to narrow the E face directional diagram of paster antenna, gain improves.
Fig. 9 is the embodiment of the present invention 1 to the antenna pattern in paster antenna H face and former paster antenna H face spoke
Penetrating the comparison diagram of directional diagram, the directional diagram of the present invention is calculated by full-wave simulation, and directional diagram uses polar coordinates table
Show, left side ordinate representative antennas far field radiation gain value in antenna pattern.From the embodiment of the present invention 1 to patch
The comparison diagram of the compression direction figure in chip antenna H face and original paster antenna H face directional diagram is it can be seen that implement
The H face directional diagram of paster antenna is had compression effectiveness, lobe to narrow by example 1, and gain improves.
Embodiments of the invention 2 are able to obtain relative dielectric constant and magnetic conductance near 11.6GHz frequency
Rate nearly zero time each physical dimension of being used as follows:
With reference to the structural representation that Figure 10 is the embodiment of the present invention 2, the present invention executes medium substrate 5 phase of example 2
Being 2.65 to dielectric constant, dielectric loss is 0.0015, and thickness is 1mm.Artificial electromagnetic material upper surface gold
Genus grid 1 is spaced 12mm two-by-two and rearranges by 25 metal grate unit 6, each metal grate unit
The raster width of 6 is 0.3mm, and lower surface metal grid 2 is spaced 6mm two-by-two by 100 metal grate unit 7
Rearranging, the raster width of each metal grate unit 7 is 0.3mm, the half of circular metal patch unit 3
Footpath is 2.5mm, each two circular metal patch unit 3 be spaced apart 6mm.The thickness of thin metal layer fence 4
Degree t be 0.01mm, highly l be 4mm.
Figure 11 is that the relative dielectric constant real part of the embodiment of the present invention 2 and imaginary part are with frequency variation curve figure.Real
Relative dielectric constant real part and the imaginary part of executing example 2 are calculated by Matlab with frequency variation curve figure, horizontal seat
Being designated as frequency, ordinate is relative dielectric constant real part and imaginary part, and solid line is that relative dielectric constant real part is with frequency
Change curve, dotted line is that relative dielectric constant imaginary part is with frequency variation curve.Normal from the relative dielectric of embodiment 2
Count real part and imaginary part with frequency variation curve figure it can be seen that embodiment 2 can realize near 11.6GHz frequency
Relative dielectric constant real part and imaginary part nearly zero.
Figure 12 is that the relative permeability real part of the embodiment of the present invention 2 and imaginary part are with frequency variation curve figure.Implement
Relative permeability real part and the imaginary part of example 2 are calculated by Matlab with frequency variation curve figure, and abscissa is
Frequency, ordinate is relative permeability real part and imaginary part, solid line be relative permeability real part with frequency variation curve,
Dotted line is that relative permeability imaginary part is with frequency variation curve.From the relative permeability real part of embodiment 2 and imaginary part with
Frequency variation curve figure is it can be seen that embodiment 2 can realize relative permeability real part near 11.6GHz frequency
Nearly with imaginary part zero.
Figure 13 is that the refractive index real part of the embodiment of the present invention 2 and imaginary part are with frequency variation curve figure.Embodiment 2
Refractive index real part and imaginary part be calculated by Matlab with frequency variation curve figure, abscissa is frequency, vertical
Coordinate is refractive index real part and imaginary part, solid line be refractive index real part with frequency variation curve, dotted line is that refractive index is empty
Portion is with frequency variation curve.Can with frequency variation curve figure from refractive index real part and the imaginary part of embodiment 2
Going out, embodiment 2 can realize refractive index real part and imaginary part nearly zero near 11.6GHz frequency.
Embodiments of the invention 3 are able to obtain relative dielectric constant and magnetic conductance near 12.4GHz frequency
Rate nearly zero time each physical dimension of being used as follows:
With reference to the structural representation that Figure 14 is the embodiment of the present invention 3, the medium substrate 5 of the embodiment of the present invention 3
Relative dielectric constant is 2.65, and dielectric loss is 0.0015, and thickness is 1mm.Artificial electromagnetic material upper surface
Metal grate 1 is spaced 12mm two-by-two and rearranges by 25 metal grate unit 6, each metal grate list
The raster width of unit 6 is 0.3mm, and lower surface metal grid 2 is spaced two-by-two by 100 metal grate unit 7
6mm rearranges, and the raster width of each metal grate unit 7 is 0.3mm, and metal patch unit 3 is
Hexagon, it is elongated for 2.5mm, each two metal patch unit 3 be spaced apart 6mm.Thin metal layer encloses
The thickness t on hurdle 4 be 0.01mm, highly l be 4mm.
Figure 15 is that the relative dielectric constant real part of the embodiment of the present invention 3 and imaginary part are with frequency variation curve figure.Real
Relative dielectric constant real part and the imaginary part of executing example 3 are calculated by Matlab with frequency variation curve figure, horizontal seat
Being designated as frequency, ordinate is relative dielectric constant, solid line be relative dielectric constant real part with frequency variation curve,
Dotted line is that relative dielectric constant imaginary part is with frequency variation curve.From relative dielectric constant real part and the void of embodiment 3
Portion with frequency variation curve figure it can be seen that embodiment 3 can realize relative dielectric near 12.4GHz frequency
Constant real part and imaginary part nearly zero.
Figure 16 is that the relative permeability real part of the embodiment of the present invention 3 and imaginary part are with frequency variation curve figure.Implement
Relative permeability real part and the imaginary part of example 3 are calculated by Matlab with frequency variation curve figure, and abscissa is
Frequency, ordinate is relative permeability real part and imaginary part, solid line be relative permeability real part with frequency variation curve,
Dotted line is that relative permeability imaginary part is with frequency variation curve.From the relative permeability real part of embodiment 3 and imaginary part with
Frequency variation curve figure it can be seen that embodiment 3 can to realize relative permeability near 12.4GHz frequency near
Zero.
Figure 17 is that the refractive index real part of the embodiment of the present invention 3 and imaginary part are with frequency variation curve figure.Embodiment 3
Refractive index real part and imaginary part be calculated by Matlab with frequency variation curve figure, abscissa is frequency, vertical
Coordinate is refractive index real part and imaginary part, solid line be refractive index real part with frequency variation curve, dotted line is that refractive index is empty
Portion is with frequency variation curve.Can with frequency variation curve figure from refractive index real part and the imaginary part of embodiment 3
Going out, embodiment 3 can realize refractive index real part and imaginary part nearly zero near 12.4GHz frequency.
Claims (6)
1. effective dielectric constant and an artificial electromagnetic material for magnetic conductivity nearly zero, including medium substrate (5), its
Being characterised by, described medium substrate (5) uses double-sided copper-clad, the upper surface etching ten of medium substrate (5)
Font metal grate (1)；Medium substrate (5) lower surface etching fishing net shape metal grate (2), in fishing net shape
Nesting metal patch unit (3) at each clear central of metal grate (2)；The surrounding of medium substrate (5)
It is arranged with thin metal layer fence (4), thin metal layer fence (4) and cross metal grate (1) and fishing net shape
Metal grate (2) is connected.
Effective dielectric constant the most according to claim 1 and the artificial electromagnetic material of magnetic conductivity nearly zero, it is special
Levying and be, the relative dielectric constant of described medium substrate (5) is between 2～10, and thickness is
0.5mm～3mm.
Effective dielectric constant the most according to claim 1 and the artificial electromagnetic material of magnetic conductivity nearly zero, it is special
Levying and be, upper surface cross metal grate (1) of described medium substrate (5) is by N1 metal grate list
Unit (6) is spaced 5mm～20mm two-by-two and rearranges, and wherein, N1 is positive integer, 2≤N1≤128, gold
Belonging to grid cell (6) to be made up of cross metal wire, the width of metal wire is 0.1mm～1mm.
Effective dielectric constant the most according to claim 1 and the artificial electromagnetic material of magnetic conductivity nearly zero, it is special
Levying and be, lower surface fishing net shape metal grate (2) of described medium substrate (5) is by N2 metal grate list
Unit (7) is spaced 3mm～8mm two-by-two and rearranges, and wherein, N2 is positive integer, 2≤N2≤512.Often
Individual metal grate unit (7) is nested to form by fishing net shape metal wire and metal patch unit (3), metal wire
Width is 0.1mm～1mm.
Effective dielectric constant the most according to claim 4 and the artificial electromagnetic material of magnetic conductivity nearly zero, it is special
Levy and be, described metal patch unit (3) be shaped as polygon or circle.
Effective dielectric constant the most according to claim 1 and the artificial electromagnetic material of magnetic conductivity nearly zero, it is special
Levy and be, the thickness t of described thin metal layer fence (4) be 0.01mm～1mm, highly l be 3mm～6mm.
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