CN104218325A - Artificial electromagnetic material with effective dielectric constant and permeability close to zero - Google Patents
Artificial electromagnetic material with effective dielectric constant and permeability close to zero Download PDFInfo
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Abstract
The invention discloses an artificial electromagnetic material with the effective dielectric constant and the permeability close to zero. The artificial electromagnetic material comprises a dielectric substrate 5, double sides of the dielectric substrate 5 are coated with copper, a fishing-net-shaped metal grid 1 is etched on the upper surface of the dielectric substrate 5; a fishing-net-shaped metal grid 2 is etched on the lower surface of the dielectric substrate 5, metal sheet pasting units 3 are etched at each blank center position of the metal grid 2; and metal thin layer fences 4 are arranged around the dielectric substrate 5 and are connected with the fishing-net-shaped metal grid 1 and the fishing-net-shaped metal grid 2. The relative dielectric constant and the permeability are close to zero under the same microwave frequency, the shapes of the metal sheet pasting units 3 are changed, frequency points with the relative dielectric constant and the permeability close to zero are regulated, and the artificial electromagnetic material is used for the fields of constructing waveguide couplers and enhancing directivity of aerial radiation and wavefront shaping.
Description
Technical field
The invention belongs to electronic technology field, further relate to the artificial electromagnetic material of a kind of effective dielectric constant in electromagnetic material technical field and magnetic permeability nearly zero.The present invention can realize relative dielectric constant and magnetic permeability nearly zero in same microwave frequency, for building the fields such as waveguide coupler, the directivity strengthening aerial radiation and wavefront shaping.
Background technology
Electromagnetism Meta Materials (Metamaterials) be also novel artificial electromagnetic media, refers to not exist at occurring in nature itself, but construct according to electromagnetic theory engineer, there is artificial medium or the structure of unconventional electromagnetism.Meta Materials has been widely used in the numerous areas such as High-directivity antenna, stealth technology, radar and microwave and millimeter wave device layout because of its Strange properties had.Meanwhile, a series of subjects such as Materials Science and Engineering, microwave antenna theory, electromagnetic theory and advanced measurement be also contemplated to the research of Meta Materials.
Zero refraction materials to be relative index of refraction be zero or be approximately zero a kind of Novel manual electromagnetic material, the phenomenon of many uniquenesses can be shown when electromagnetic wave is propagated in zero refraction materials, as phase place be changed to zero, super coupling effect and electromagnetism tunnelling etc., this has broad application prospects for building waveguide coupler, the directivity strengthening aerial radiation and wavefront shaping etc.
The coating of antenna is by placing artificial electromagnetic material or structure to reach the object improving original antenna gain above antenna.Nearly zero refraction materials to have the effect of wavefront shaping because of it to electromagnetic wave, it can be used as the coating of antenna, the Aperture field distribution of energy Effective Regulation antenna, realize the outgoing field of almost plane ripple, effectively can compress the radiation lobe of antenna, converge the radiant power of antenna, thus improve the gain of antenna.Research shows, nearly zero refraction materials of electricity, as the coating of antenna, effectively can only compress the radiation lobe width in electric field place plane (E face); And nearly zero refraction materials of magnetic is as the coating of antenna, effectively can only compress the radiation lobe width in place, magnetic field plane (H face), both all can not reach best gain and improve effect.
The microwave power synthesis system disclosing a kind of zero index lens and be made up of this zero index lens in the patented technology " the microwave power synthesis system of zero index lens and formation thereof " (application number: 201210073795 authorizes publication No.: 102593605B) that Sichuan University has.This system comprises zero index lens and at least 2 antenna for radiating microwave, and antenna for radiating microwave passes through described zero index lens to same direction launched microwave.Although it is simple that this microwave power synthesis system has system configuration, flexible configuration, the advantage that system cost is low.But the weak point that this system still exists has 2 points, the first, zero index lens thickness of this system is the integral multiple of half operation wavelength, and the overall section of system is larger, is unfavorable for the practical application of system.The second, this microwave power synthesis system can not compress E face and the H face of antenna for radiating microwave directional diagram simultaneously, improves limited to primary antenna gain.
A kind of rectangle frame fractal antenna simultaneously with nearly zero index of refraction effects and left-handedness effect is disclosed in the patented technology " a kind of rectangle frame fractal antenna simultaneously with nearly zero index of refraction effects and left-handedness effect " (application number: 201320514042.8, Authorization Notice No.: 203617428U) that Jiangsu University has.This rectangle frame fractal antenna comprises three layers of medium substrate, metal ground plate, the fractal metal radiation paster of rectangle frame, microstrip feed line, rectangular metal resonant ring.The medium substrate of this composite construction has three layers, and first and third layer of relative dielectric constant is 10, and second layer relative dielectric constant is 2.2.Driving source adopts Gaussian discrete source, by microstrip feed line to paster antenna feed.Although the localization degree of the electromagnetic energy of this antenna is significantly improved, convergence effect is produced to wave beam, causes antenna gain obviously to increase, and show as lower return loss.But this rectangle frame fractal antenna has 2 weak points, the first, this antenna adopts 3 laminar substrates, the topological structure more complicated of each layer, higher to the requirement of processing technology, and its thickness is 3 times of former paster antenna, loses the advantage of the low section of paster antenna.The second, this antenna can not compress E face and the H face of former paster antenna directional diagram simultaneously, improves limited to former paster antenna gain.
In sum, current artificial electromagnetic material is faced with three problems,
One, the artificial electromagnetic material of existing dielectric constant nearly zero only plays wavefront shaping operation to the E face electric field of antenna, and the artificial electromagnetic material of existing magnetic permeability nearly zero only plays wavefront shaping operation to the magnetic field, H face of antenna, limited to the improvement of antenna gain.
Its two, existing artificial electromagnetic material relative permeability and relative dielectric constant, not at same frequency nearly zero, can not compress the E face of antenna and H surface radiation directional diagram lobe simultaneously, limited to the directivity factor improving antenna.
Its three, the structural topology of existing artificial electromagnetic material is complicated, make relative dielectric constant and magnetic permeability with frequently nearly zero artificial electromagnetic material design difficulty high, Project Realization is poor.
Summary of the invention
The deficiency that the artificial electromagnetic material that the present invention is directed to above-mentioned prior art faces, the artificial electromagnetic material of a kind of relative dielectric constant and magnetic permeability nearly zero is provided, make artificial electromagnetic material compress antenna E face and H face directional diagram simultaneously, and meet antenna coating wave impedance and free space wave impedance matching condition.
For achieving the above object, technical scheme of the present invention is as follows.
The present invention includes medium substrate, medium substrate adopts double-sided copper-clad, the upper surface etching fishing net shape metal grate of medium substrate; Medium substrate lower surface etching fishing net shape metal grate, at each clear central place etching metal chip unit of metal grate; The surrounding of medium substrate is arranged with thin metal layer fence, and thin metal layer fence is connected with the fishing net shape metal grate of upper and lower surface.
Invention compared with prior art has the following advantages:
First, the present invention is in medium substrate upper surface etching fishing net shape metal grate, at medium substrate lower surface etching fishing net shape metal grate and metal patch, artificial electromagnetic material is made to have the feature of relative dielectric constant and magnetic permeability nearly zero, the antenna coating overcoming the only dielectric constant nearly zero that prior art exists only plays wavefront shaping operation to the E face electric field of antenna, and the antenna coating of only magnetic permeability nearly zero only plays the shortcoming of wavefront shaping operation to the magnetic field, H face of antenna, the present invention is made to be provided with the advantage simultaneously compressing antenna E face and H surface radiation directional diagram main lobe, effectively increase the gain of antenna.
Second, the present invention etches the structure of fishing net shape metal grate and metal patch by lower surface, overcome prior art exist artificial electromagnetic material relative permeability and relative dielectric constant not in the shortcoming of same frequency nearly zero, the present invention is had and to mate with free space impedance and to reflect less advantage, effectively reduce back lobe and the section of coating antenna.
3rd, the present invention is by changing the shape and size of lower surface polygon metal patch, overcome the shortcoming that artificial electromagnetic material relative permeability and the nearly zero-frequency point of relative dielectric constant that prior art exists are fixing, make the present invention have the advantage of relative dielectric constant and the nearly zero-frequency point of relative permeability.
3rd, artificial electromagnetic material in the present invention adopts the medium substrate of double-sided copper-clad to make, and overcomes existing coating topological structure complicated, makes that coating design difficulty is high, the shortcoming of Project Realization difference, makes the present invention have simplicity of design, is easy to the advantage of processing.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
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 compression direction figure in the embodiment of the present invention 1 pair of paster antenna E face and the comparison diagram of paster antenna E face directional diagram;
Fig. 9 is the compression direction figure in the embodiment of the present invention 1 pair of paster antenna H face and the comparison diagram of paster antenna H face directional diagram.
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
Below in conjunction with accompanying drawing, the invention will be further described.
With reference to accompanying drawing 1, accompanying drawing 2 and accompanying drawing 3, structure of the present invention is as follows.
The present invention includes medium substrate 5, medium substrate 5 adopts 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, at each clear central place etching metal chip unit 3 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 2 with fishing net shape metal grate 1.
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 by N1 metal grate unit 6 between two interval 5mm ~ 20mm rearrange, wherein N1 is positive integer, 2≤N1≤128, and in each metal grate unit 6, the width of grid is 0.1mm ~ 1mm.
The lower surface fishing net shape metal grate 2 of medium substrate 5 by N2 metal grate unit 7 between two interval 3mm ~ 8mm rearrange, wherein N2 is positive integer, 2≤N2≤512, and in each metal grate unit 7, the width of grid is 0.1mm ~ 1mm.
The shape of metal patch unit 3 is polygon or circle.
The thickness t of thin metal layer fence 4 is 0.01mm ~ 1mm, and height l is 3mm ~ 6mm.
Embodiments of the invention 1 be in order to can obtain relative dielectric constant and magnetic permeability near 10.8GHz frequency nearly zero time each physical dimension of adopting 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, and thickness is 1mm.Artificial electromagnetic material upper surface metal grate 1 by 25 metal grate unit 6 between two interval 12mm rearrange, the raster width of each metal grate unit 6 is 0.3mm, lower surface metal grid 2 by 100 metal grate unit 7 between two interval 6mm rearrange, the raster width of each metal grate unit 7 is 0.3mm, the length of side of square metal chip unit 3 is 4.2mm, every two square metal chip units 3 be spaced apart 6mm.The thickness t of thin metal layer fence 4 is 0.01mm, and height l is 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.The relative dielectric constant real part of embodiment 1 and imaginary part are calculated by Matlab with frequency variation curve figure, and abscissa is frequency, and ordinate is relative dielectric constant real part and imaginary part.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.As can be seen from the relative dielectric constant real part of embodiment 1 and imaginary part with frequency variation curve figure, embodiment 1 can realize relative dielectric constant real part and imaginary part nearly zero near 10.8GHz frequency.
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.The relative permeability real part of embodiment 1 and imaginary part are calculated by Matlab with frequency variation curve figure, 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.As can be seen from the relative permeability real part of embodiment 1 and imaginary part with frequency variation curve figure, embodiment 1 can realize relative permeability real part and imaginary part nearly zero near 10.8GHz frequency.
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.The refractive index real part of embodiment 1 and imaginary part are calculated by Matlab with frequency variation curve figure, and abscissa is frequency, and ordinate is refractive index real part and imaginary part, solid line be refractive index real part with frequency variation curve, it is bent with frequency change that dotted line is imaginary index.As can be seen from the refractive index real part of embodiment 1 and imaginary part with frequency variation curve figure, embodiment 1 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 as antenna coating above paster antenna.Paster antenna comprises antenna medium substrates 8, aerial radiation structure 9, antenna floor 10, the outer core 11 of antenna SMA feed connection, antenna SMA feed connection inner core 12.Antenna medium substrates 8 relative dielectric constant is 2.5, thickness is 1mm, be of a size of 60mm × 60mm, aerial radiation structure 9 is positioned at the center of medium substrate 8, is of a size of the square patch of 7.3mm × 7.3mm, and antenna floor 10 is 60mm × 60mm square patch, outer core 11 radius of antenna SMA feed connection is 0.875mm, be highly 1mm, antenna SMA feed connection inner core 12 radius being 0.375mm, is highly 2mm.Antenna SMA feed connection inner core 12 welds mutually with aerial radiation structure 9, and pad is positioned at 1.5mm place, left, aerial radiation structure 9 center.Embodiment 1 is arranged on 9mm place above paster antenna.
Fig. 8 is the antenna pattern in the embodiment of the present invention 1 pair of paster antenna E face and the comparison diagram of former paster antenna E surface radiation directional diagram, directional diagram of the present invention is calculated by full-wave simulation, directional diagram adopts polar coordinate representation, ordinate representative antennas far field radiation gain value in left side in antenna pattern.As can be seen from the compression direction figure in the embodiment of the present invention 1 pair of paster antenna E face and the comparison diagram of former paster antenna E face directional diagram, the E face directional diagram of embodiment 1 pair of paster antenna has compression effectiveness, and lobe narrows, and gain improves.
Fig. 9 is the antenna pattern in the embodiment of the present invention 1 pair of paster antenna H face and the comparison diagram of former paster antenna H surface radiation directional diagram, directional diagram of the present invention is calculated by full-wave simulation, directional diagram adopts polar coordinate representation, ordinate representative antennas far field radiation gain value in left side in antenna pattern.As can be seen from the compression direction figure in the embodiment of the present invention 1 pair of paster antenna H face and the comparison diagram of original paster antenna H face directional diagram, the H face directional diagram of embodiment 1 pair of paster antenna has compression effectiveness, and lobe narrows, and gain improves.
Embodiments of the invention 2 be in order to can obtain relative dielectric constant and magnetic permeability near 11.6GHz frequency nearly zero time each physical dimension of adopting as follows:
With reference to the structural representation that Figure 10 is the embodiment of the present invention 2, medium substrate 5 relative dielectric constant that the present invention executes example 2 is 2.65, and dielectric loss is 0.0015, and thickness is 1mm.Artificial electromagnetic material upper surface metal grate 1 by 25 metal grate unit 6 between two interval 12mm rearrange, the raster width of each metal grate unit 6 is 0.3mm, lower surface metal grid 2 by 100 metal grate unit 7 between two interval 6mm rearrange, the raster width of each metal grate unit 7 is 0.3mm, the radius of circular metal patch unit 3 is 2.5mm, every two circular metal patch unit 3 be spaced apart 6mm.The thickness t of thin metal layer fence 4 is 0.01mm, and height l is 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.The relative dielectric constant real part of embodiment 2 and imaginary part are calculated by Matlab with frequency variation curve figure, abscissa is frequency, ordinate is relative dielectric constant real part and imaginary part, 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.As can be seen from the relative dielectric constant real part of embodiment 2 and imaginary part with frequency variation curve figure, embodiment 2 can realize relative dielectric constant real part and imaginary part nearly zero near 11.6GHz frequency.
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.The relative permeability real part of embodiment 2 and imaginary part are calculated by Matlab with frequency variation curve figure, 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.As can be seen from the relative permeability real part of embodiment 2 and imaginary part with frequency variation curve figure, embodiment 2 can realize relative permeability real part and imaginary part nearly zero near 11.6GHz frequency.
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.The refractive index real part of embodiment 2 and imaginary part are calculated by Matlab with frequency variation curve figure, and abscissa is frequency, and ordinate is refractive index real part and imaginary part, solid line be refractive index real part with frequency variation curve, dotted line is that imaginary index is with frequency variation curve.As can be seen from the refractive index real part of embodiment 2 and imaginary part with frequency variation curve figure, embodiment 2 can realize refractive index real part and imaginary part nearly zero near 11.6GHz frequency.
Embodiments of the invention 3 be in order to can obtain relative dielectric constant and magnetic permeability near 12.4GHz frequency nearly zero time each physical dimension of adopting as follows:
With reference to the structural representation that Figure 14 is the embodiment of the present invention 3, medium substrate 5 relative dielectric constant of the embodiment of the present invention 3 is 2.65, and dielectric loss is 0.0015, and thickness is 1mm.Artificial electromagnetic material upper surface metal grate 1 by 25 metal grate unit 6 between two interval 12mm rearrange, the raster width of each metal grate unit 6 is 0.3mm, lower surface metal grid 2 by 100 metal grate unit 7 between two interval 6mm rearrange, the raster width of each metal grate unit 7 is 0.3mm, metal patch unit 3 is hexagon, it is elongated is 2.5mm, every two metal patch unit 3 be spaced apart 6mm.The thickness t of thin metal layer fence 4 is 0.01mm, and height l is 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.The relative dielectric constant real part of embodiment 3 and imaginary part are calculated by Matlab with frequency variation curve figure, abscissa is 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.As can be seen from the relative dielectric constant real part of embodiment 3 and imaginary part with frequency variation curve figure, embodiment 3 can realize relative dielectric constant real part and imaginary part nearly zero near 12.4GHz frequency.
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.The relative permeability real part of embodiment 3 and imaginary part are calculated by Matlab with frequency variation curve figure, 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.As can be seen from the relative permeability real part of embodiment 3 and imaginary part with frequency variation curve figure, embodiment 3 can realize relative permeability nearly zero near 12.4GHz frequency.
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.The refractive index real part of embodiment 3 and imaginary part are calculated by Matlab with frequency variation curve figure, and abscissa is frequency, and ordinate is refractive index real part and imaginary part, solid line be refractive index real part with frequency variation curve, dotted line is that imaginary index is with frequency variation curve.As can be seen from the refractive index real part of embodiment 3 and imaginary part with frequency variation curve figure, embodiment 3 can realize refractive index real part and imaginary part nearly zero near 12.4GHz frequency.
Claims (6)
1. the artificial electromagnetic material of an effective dielectric constant and magnetic permeability nearly zero, comprise medium substrate (5), it is characterized in that, described medium substrate (5) adopts double-sided copper-clad, 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), each clear central place etching metal chip unit (3) 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 (2) with fishing net shape metal grate (1).
2. the artificial electromagnetic material of effective dielectric constant according to claim 1 and magnetic permeability nearly zero, is characterized in that, the relative dielectric constant of described medium substrate (5) is between 2 ~ 10, and thickness is 0.5mm ~ 3mm.
3. the artificial electromagnetic material of effective dielectric constant according to claim 1 and magnetic permeability nearly zero, it is characterized in that, upper surface fishing net shape metal grate (1) of described medium substrate (5) by N1 metal grate unit (6) between two interval 5mm ~ 20mm rearrange, wherein N1 is positive integer, 2≤N1≤128, the raster width of each metal grate unit (6) is 0.1mm ~ 1mm.
4. the artificial electromagnetic material of effective dielectric constant according to claim 1 and magnetic permeability nearly zero, it is characterized in that, lower surface fishing net shape metal grate (2) of described medium substrate (5) by N2 metal grate unit (7) between two interval 3mm ~ 8mm rearrange, wherein N2 is positive integer, 2≤N2≤512, the raster width of each metal grate unit (7) is 0.1mm ~ 1mm.
5. the artificial electromagnetic material of effective dielectric constant according to claim 1 and magnetic permeability nearly zero, is characterized in that, the shape of described metal patch unit (3) is polygon or circle.
6. the artificial electromagnetic material of effective dielectric constant according to claim 1 and magnetic permeability nearly zero, is characterized in that, the thickness t of described thin metal layer fence (4) is 0.01mm ~ 1mm, and height l is 3mm ~ 6mm.
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| CN110739540A (en) * | 2019-10-30 | 2020-01-31 | 吴通控股集团股份有限公司 | kinds of artificial dielectrics |
| WO2021104113A1 (en) * | 2019-11-29 | 2021-06-03 | 深圳先进技术研究院 | Near-zero refractive index metamaterial antenna |
| CN112582783A (en) * | 2020-10-27 | 2021-03-30 | 西安交通大学 | Integrated AIP assembly, terminal equipment and terminal equipment shell |
| CN114442224A (en) * | 2020-11-06 | 2022-05-06 | 格芯(美国)集成电路科技有限公司 | Edge coupler comprising material with tunable refractive index |
| CN114442224B (en) * | 2020-11-06 | 2024-02-23 | 格芯(美国)集成电路科技有限公司 | Edge coupler comprising a material with a tunable refractive index |
| CN112864567A (en) * | 2021-01-08 | 2021-05-28 | 上海交通大学 | Method for manufacturing transmission adjustable waveguide by utilizing metal back plate and dielectric cavity |
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