CN211265719U - Multifunctional super surface based on solid-state plasma regulation and control - Google Patents
Multifunctional super surface based on solid-state plasma regulation and control Download PDFInfo
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- CN211265719U CN211265719U CN201921997657.4U CN201921997657U CN211265719U CN 211265719 U CN211265719 U CN 211265719U CN 201921997657 U CN201921997657 U CN 201921997657U CN 211265719 U CN211265719 U CN 211265719U
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Abstract
The utility model discloses a multi-functional super surface based on solid state plasma regulation and control, this super surface texture include metal reflecting plate, first layer dielectric layer, first layer solid state plasma resonance unit, second floor dielectric layer, the solid state plasma resonance unit of second floor of bottom from bottom to top. The solid plasma resonance unit is realized by an array composed of PIN units, and the PIN unit array is controlled and excited by a programmable logic array loaded at two ends of the solid plasma resonance unit so as to obtain the solid plasma. Through the excitation state of the solid-state plasma resonance unit in different regions of programming control, the utility model discloses a function can freely switch between polarization converter and ripples ware. The utility model has the characteristics of wide frequency band, regulation and control able to programme, the design is nimble, and the practicality is strong, and functional strong etc.
Description
Technical Field
The utility model relates to a multi-functional super surface, specific surface is surpassed on many surfaces that can regulate and control based on solid state plasma that says so belongs to solid state plasma practical technique and microwave device technical field.
Background
The artificial electromagnetic super surface is a development and extension of a novel artificial electromagnetic material. In the process of researching novel artificial electromagnetic materials, researchers find that if sub-wavelength electromagnetic units are arranged on a two-dimensional plane, the plane can regulate and control the propagation direction and the polarization direction of electromagnetic waves by designing the self structure and the arrangement mode of the units. Compared with a novel three-dimensional artificial electromagnetic material, the artificial electromagnetic super-surface has the advantages of low profile, low cost, convenience in manufacturing, easiness in conforming to a curved surface and the like, so that the artificial electromagnetic super-surface has wider application in engineering.
Electromagnetic wave absorbers are functional structures or devices that can absorb the energy of incident electromagnetic waves. Electromagnetic wave absorbers were first widely used in the military field, and mainly focused on radar stealth applications. Various scholars have carried out a great deal of work and research on how to design, prepare and test the electromagnetic wave absorber and improve the performance of the electromagnetic wave absorber, and the like, which obviously promotes the development of the electromagnetic wave absorber. The conventional radar wave absorbing material often has the defects of poor stability, heavy weight, thick thickness and the like, so that a key point of the research of the wave absorbing material at the present stage is to find out the wave absorbing material which can be efficiently absorbed, has good stability, light weight and thin thickness.
The polarization converter is a device with the function of controlling the polarization direction of electromagnetic waves, is a very important device in the application of electromagnetic wave propagation, and particularly has important application value in the fields of nano-photonic devices, advanced sensors and the like. In addition, in the microwave band, the polarization converter plays a crucial role in the design of circularly polarized antennas and radomes. The traditional method for realizing the electromagnetic wave polarization regulation is usually based on the birefringence effect and is realized by using dichromatic solid crystals and twisted nematic liquid crystals. However, such conventional polarization conversion devices have certain disadvantages, and these conventional polarization control devices have a complicated design process, a large thickness of the whole structure, and high requirements for materials and processing techniques.
The polarization converter and the wave absorber based on the electromagnetic super surface can effectively solve the problems, and the special sub-wavelength structure and the singular physical characteristics of the metamaterial can be used on ultrathin miniaturized devices and can meet the requirements of broadband and reconfigurability after being specially designed. At present, the performance regulating effect which can be achieved by a single regulating means is often limited by the response degree of the external environment and the controllable device to a single physical field, and is difficult to adapt to the requirements of the current technical development.
This problem is well solved by a solid state plasma, which is formed in the intrinsic layer of the semiconductor by means of an external excitation, for example electricity or light, which exhibits metallic properties when the external excitation and the carrier concentration in the solid state plasma reach a certain value. When the plasma is not excited into solid plasma, the dielectric property of the plasma is similar to that of a semiconductor, so that the plasma can be used in electromagnetic devices with tunable/reconfigurable, multifunctional and multi-physical fields, the functions of the electromagnetic devices are more diversified, and the electromagnetic devices can respond to more complex and diversified electromagnetic environments more fully.
Disclosure of Invention
The to-be-solved technical problem of the utility model is overcome prior art not enough, and provide a multi-functional super surface based on solid-state plasma regulation and control, through the excitation state of the resonance unit that outside logic array programming control solid-state plasma constitutes, can be at these two kinds of functions of energy absorption and cross polarization conversion of different frequency domain within ranges, and further regulate and control polarization conversion's working band, and the working range through reasonable parameter optimization wave absorber can cover most C wave band and the total working band of polarization converter function covers whole C wave band and X wave band basically.
The utility model discloses a solve above-mentioned problem and adopt following technical scheme: the utility model provides a multifunctional super surface based on solid state plasma regulation and control, which comprises a bottom metal reflecting plate, a first dielectric layer, a first solid state plasma resonance unit, a second dielectric layer and a second solid state plasma resonance unit from bottom to top in sequence; the first layer of solid-state plasma resonance unit consists of three parts, namely an Archimedes spiral structure positioned in the center and two first L-shaped structures positioned at diagonal angles, and the second layer of solid-state plasma resonance unit consists of three parts, namely an inverted Archimedes spiral structure positioned in the center and two second L-shaped structures positioned at diagonal angles.
The utility model discloses be exactly adopt solid-state plasma as the resonance unit to through the excitation state of the different solid-state plasma resonance units of artificial selectivity control, through the excitation state of the different regional solid-state plasma resonance unit of programming control, this surpass the surface when realizing two kinds of functions of polarization converter and ripples ware, still can adjust polarization converter's working band. The super-surface can realize three working states, wherein one state is a wave absorber, and the TE mode working range is 5.87-7.30 GHz; the second state is a cross polarization converter, and the working range is 7.4-12.2 GHz; state three is again a cross-polarization converter, but the operating band shifts to 5.71-8.47 GHz. Compared with the traditional adjustable device, the structure has the advantages of wide bandwidth, multiple functions, flexible design and the like, and provides a new idea for the design and development of the multifunctional device.
As a further technical solution of the present invention, the archimedes spiral structure of the first layer solid state plasma resonance unit has an inner radius r of 0.58mm, a radius ratio, i.e., a ratio m between a final radius before and after the spiral rotation and an initial radius of 5.8, a number N of turns of 5, and a width w of 0.54 mm; the two arms of the first L-shaped structure are both rectangles with the length e being 5.8mm and the width d being 2.4mm, and the distance f between the two arms and the boundary of the medium is 1 mm.
Furthermore, the reverse Archimedes spiral structure and the first layer of Archimedes spiral have opposite rotating directions, and other parameters are the same; and two arms of the second L-shaped structure are rectangles with the length b being 7.4mm and the width a being 1.7mm, and g being 1.4mm away from the boundary of the medium respectively.
Furthermore, the solid plasma resonance units are all realized by arrays consisting of PIN units, and isolation layers are arranged among the PIN units for isolation; bias voltage is loaded at two ends of the solid plasma resonance unit for excitation, and the solid plasma resonance unit shows dielectric characteristics when not excited, namely the solid plasma resonance unit is in an unexcited state; when excited, the material shows metal characteristics, namely, an excited state.
Further, the plasma frequency of the Archimedes spiral structure and the reverse Archimedes spiral structure is omegap1＝2.9×1014rad/s, the plasma frequency of the first and second L-shaped structures is omegap2＝2.2×1015rad/s, collision frequency of all solid state plasma resonance units is omegac＝1.65×10131/s。
Furthermore, the two dielectric layers are made of FR4, the dielectric constant is 4.3, the loss tangent value is 0.025, the side length p of the dielectric layer is 17mm, and the thickness h is 1.8 mm.
Furthermore, the bottom metal reflecting plate is made of copper, and the thickness t is 0.1 mm. And the thickness of all the solid plasma resonance units is t0.1 mm.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
(1) the utility model relates to a multi-functional super surface based on solid-state plasma regulation and control through the excitation state of the resonance unit that outside logic array programming control solid-state plasma constitutes to two kinds of purposes that function switching (wave absorber-linear polarization converter) and polarization conversion operating band are adjustable have been realized. When electromagnetic waves vertically enter, three different excitation states can be realized, the functions of a wave absorber (state one) and a polarization converter (state two) can be realized in a C wave band through reasonable parameter optimization, and further, the working range of the polarization converter can be expanded to an X wave band (state three) through regulation and control.
(2) The utility model has the characteristics of frequency band coverage is wide, the design is nimble, functional variety, practicality are strong etc.
Drawings
Figure 1 is a top view of the present invention,
wherein, (a) is a top view of the first layer of solid state plasma resonance unit, and (b) is a top view of the second layer of solid state plasma resonance unit.
Fig. 2 is a side view of the present invention.
Fig. 3 is a perspective view of the present invention.
Fig. 4 is a schematic perspective view of three states formed by the present invention.
Fig. 5 is a 3 × 3 array diagram according to the present invention.
Fig. 6 is an absorption curve of the state-TE mode of the electromagnetic wave at normal incidence according to the present invention.
Fig. 7 is a reflection amplitude curve of the second state when the electromagnetic wave of the present invention is vertically incident (the electric field is along the u-axis and the v-axis, respectively).
Fig. 8 is a reflection phase difference curve of the second state when the electromagnetic wave of the present invention is vertically incident (the electric field is along the u-axis and the v-axis, respectively).
Fig. 9 is a reflection amplitude curve of the second state when the electromagnetic wave of the present invention is vertically incident (the electric field is along the y-axis).
Fig. 10 is a reflection amplitude curve of the third state of the present invention when the electromagnetic wave is vertically incident (the electric field is along the u-axis and the v-axis, respectively).
Fig. 11 is a reflection phase difference curve of the third state when the electromagnetic wave of the present invention is vertically incident (the electric field is along the u-axis and the v-axis, respectively).
Fig. 12 is a reflection amplitude curve of the state three when the electromagnetic wave of the present invention is vertically incident (the electric field is along the y-axis).
FIG. 13 is a graph showing the second and third polarization conversion rate curves of the electromagnetic wave of the present invention in the vertical incidence (electric field along the y-axis)
The reference signs explain: 1. 2-second L-shaped solid plasma resonance unit, 6, 7-first L-shaped solid plasma resonance unit, 3-reverse Archimedes spiral solid plasma resonance unit, 8-Archimedes spiral solid plasma resonance unit, 4-second FR4 dielectric layer, 5-first FR4 dielectric layer, 9-metal reflecting plate, 10, 11, 12, 13, 14, 15-plasma excitation source.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings and the specific embodiments as follows:
the utility model relates to a multi-functional super surface based on solid-state plasma regulation and control should surpass the surface and form by unit structure periodic arrangement, through the solid-state plasma resonance unit of the different regions of excitation, can produce following three kinds of states altogether, as shown in FIG. 4: in the first state, the structural unit comprises a bottom metal reflecting plate 9, two FR4 medium layers 4 and 5, an excited reverse Archimedes spiral solid-state plasma resonance unit 3, an excited reverse Archimedes spiral solid-state plasma resonance unit 8 and solid-state plasma excitation sources 10 and 11. And in the second state, the structural unit comprises a bottom metal reflecting plate 9, two layers 4 and 5 of FR4 medium, second L-shaped solid plasma resonance units 6 and 7 which are excited, and solid plasma excitation sources 14 and 15. And the structural unit comprises a bottom metal reflecting plate 9, two FR4 medium layers 4 and 5, excited second L-shaped solid plasma resonance units 6 and 7, excited first L-shaped solid plasma resonance units 1 and 2 and solid plasma excitation sources 12, 13, 14 and 15. By selectively programming and exciting different solid plasma resonance units, the super-surface can realize multiple functions and freely switch back and forth, and the purpose of adjusting the working frequency band under a certain function can be achieved.
The top view of the first and second layers of solid-state plasma resonance units of the super surface is shown in fig. 1, the side view of the super surface is shown in fig. 2, and the (3 × 3) array view of the super surface is shown in fig. 5.
The solid-state plasma resonance units are realized by an array of PIN units, the size of each PIN unit is 0.1mm × 0.1.1 mm, a Drude model is selected to describe the dielectric constant of the solid-state plasma, and the plasma frequency of two Archimedes spiral solid-state plasma resonance units is omegap1＝2.9×1014The plasma frequency of four L-shaped solid plasma resonance units with rad/s is omegap1＝2.2×1015rad/s, collision frequency of all solid state plasma resonance units is omegac＝1.65×10131/s。
The solid-state plasma resonance units 1, 2, 3, 6, 7 and 8 are respectively excited by plasma excitation sources 10, 11, 15, 14, 12 and 13, and the on-off states of the plasma excitation sources 10, 11, 15, 14, 12 and 13 are controlled by programming, as shown in fig. 4.
The utility model discloses electromagnetic super surface polarization converter's based on solid-state plasma production method, when electromagnetic wave (electric field along y axle) normal incidence, state one: the super surface has the function of a wave absorber and is caused by the joint work of the excited solid plasma resonance units 1 and 2; and a second state: the super-surface behaves as a cross-polarized transducer, caused by the co-operation of the excited solid state plasmon resonance units 3, 4. And a third state: the super-surface also behaves as a cross-polarized transducer, but the operating band does not coincide with state two, caused by the co-operation of the excited solid state plasmon resonance units 3, 4, 5, 6.
Specific parameters of the ultra-super-surface are shown in table 1.
When only two layers of Archimedes spiral solid-state plasma resonance units 3 and 8 are excited, the super-surface energy realizes the function of a wave absorber, and the state is defined as a state I. In operation, electromagnetic waves are incident perpendicularly along the-z direction, the TE mode is defined as the incident electromagnetic wave with the electric field along the y-axis and the magnetic field along the x-axis. FIG. 6 is the absorption curve of the TE mode with the meta-surface in the state. From figure 5 we can see that the absorption rate is greater than 90% in the range 5.87-7.30GHz and the relative bandwidth is 21.72%.
When only two second L-shaped solid state plasmon resonance units 6, 7 are excited, the function of the super-surface is switched to a linear polarization converter, which we define as state two. FIG. 7 is a reflection amplitude curve when the electromagnetic wave is vertically incident (the electric field is along the u-axis and the v-axis, respectively) in the second state, wherein the reflection coefficient curve r is shown when the u-polarized wave is incident in the solid lineuuThe dotted line represents a reflection coefficient curve r when a v-polarized wave is incidentvv. Fig. 8 is a reflection phase difference curve when the electromagnetic wave is vertically incident (electric field along u-axis and v-axis, respectively) in state two. FIG. 9 is a reflection amplitude curve when the electromagnetic wave is vertically incident (the electric field is along the y-axis) in the second state, in which the solid line is the homopolarization reflection amplitude curve ryyThe dotted line is the cross polarization reflection amplitude curve rxy. In FIGS. 7 and 8, ruuAnd rvvSubstantially equal and close to 1 at 7.5-12.2GHz, and thisThe reflection phase difference in the frequency band is kept approximately around-180 deg., so that the meta-surface has the basic condition for achieving cross-polarization switching in state two. While FIG. 9 further verifies this, we can see that r isxyIs far greater than r in the working rangeyyThis proves that the y-polarized electromagnetic wave is substantially reflected and converted into its cross-polarized wave, i.e., x-polarized wave, at 7.5-12.2 GHz.
When we further excite the two first L-shaped solid-state plasmon resonance units 1 and 2 based on state two, the operating band of the super-surface for realizing cross-polarization transformation can be adjusted to the low frequency region, which we define as state three. Fig. 10 is a graph of the reflection amplitude when the electromagnetic wave is incident perpendicularly (electric field along the u-axis and v-axis, respectively) in state three. Fig. 11 is a reflection phase difference curve when an electromagnetic wave is perpendicularly incident (electric field along u-axis and v-axis, respectively) in state three. Fig. 12 is a graph of the reflection amplitude when the electromagnetic wave is incident perpendicularly (electric field along the y-axis) in state three. Similarly to the state two, in fig. 10 and 11, ruuAnd rvvThe reflection phase difference is approximately kept near +/-180 degrees at 5.6-8.4GHz, and the reflection phase difference is approximately equal to or close to 1, so that the meta-surface also meets the basic condition for realizing cross polarization conversion in the state three. As can be seen from fig. 12, the y-polarized incident wave is substantially reflected and converted to an x-polarized wave within 5.6-8.4 GHz.
For the polarization converter, the polarization conversion rate is a key index for measuring the performance of the polarization converter. Formula of polarization conversion rate
PCR represents the reflection polarization conversion rate, rxyDenotes the cross-polarization reflection coefficient, ryyDenotes the co-polarized reflection coefficient, txyDenotes the cross-polarization transmission coefficient, tyyShows the co-polarization transmission coefficient, t is the complete metal reflecting plate at the bottom layerxy＝t yy0. Engineering definition, when PCR is greater than 0.9, then it can be considered that efficient cross-polarization switching is achieved. FIG. 13 is a plot of polarization conversion efficiency for the super-surface in states two and three. When the polarization transformer is in state two, as shown in FIG. 13(the second L-shaped solid state plasma resonance unit 6, 7 is excited), the polarization conversion ratio is substantially 0.9 or more in 7.39-12.15 GHz. When the polarization converter is in the state three (the first and second L-shaped solid plasma resonance units 6, 7, 1 and 2 are excited), the polarization conversion rate is substantially above 0.9 in the range of 5.58-8.28 GHz. In summary, when the polarization converter switches between the second state and the third state, the operating frequency band of the cross polarization conversion can be manually adjusted.
After specific design, the utility model discloses when realizing two kinds of functions of energy absorption and polarization conversion, can freely regulate and control polarization converter's working range as required by the manual work to make this super surface can realize the function switching, also can carry out the frequency band and shift. The utility model has the characteristics of frequency band coverage is wide, the regulation and control means is various, the design is nimble, functional strong, the practicality is strong etc. The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration only, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the claims and their equivalents.
Claims (7)
1. A multifunctional super surface based on solid state plasma regulation is characterized in that: the plasma display panel sequentially comprises a bottom metal reflecting plate, a first dielectric layer, a first solid plasma resonance unit, a second dielectric layer and a second solid plasma resonance unit from bottom to top; the first layer of solid-state plasma resonance unit consists of three parts, namely an Archimedes spiral structure positioned in the center and two first L-shaped structures positioned at diagonal angles, and the second layer of solid-state plasma resonance unit consists of three parts, namely an inverted Archimedes spiral structure positioned in the center and two second L-shaped structures positioned at diagonal angles.
2. The solid state plasma mediated based multifunctional super surface of claim 1, wherein: the inner radius r of the Archimedes spiral structure of the first layer of solid-state plasma resonance unit is 0.58mm, the radius ratio, namely the ratio m of the final radius before and after the spiral rotation to the initial radius is 5.8, the number of turns N is 5, and the width w is 0.54 mm; the two arms of the first L-shaped structure are both rectangles with the length e being 5.8mm and the width d being 2.4mm, and the distance f between the two arms and the boundary of the medium is 1 mm.
3. The solid state plasma mediated based multifunctional super surface of claim 1, wherein: the reverse Archimedes spiral structure and the first layer of Archimedes spiral have opposite rotating directions, and the other parameters are the same; and two arms of the second L-shaped structure are rectangles with the length b being 7.4mm and the width a being 1.7mm, and g being 1.4mm away from the boundary of the medium respectively.
4. The solid state plasma mediated based multifunctional super surface of claim 1, wherein: the solid plasma resonance units are all realized by arrays consisting of PIN units, and isolation layers are arranged among the PIN units for isolation; bias voltage is loaded at two ends of the solid plasma resonance unit for excitation, and the solid plasma resonance unit shows dielectric characteristics when not excited, namely the solid plasma resonance unit is in an unexcited state; when excited, the material shows metal characteristics, namely, an excited state.
5. The solid state plasma mediated based multifunctional super surface of claim 1, wherein: the plasma frequency of the Archimedes spiral structure and the reverse Archimedes spiral structure is omegap1＝2.9×1014rad/s, the plasma frequency of the first and second L-shaped structures is omegap2＝2.2×1015rad/s, collision frequency of all solid state plasma resonance units is omegac＝1.65×10131/s。
6. The solid state plasma mediated based multifunctional super surface of claim 1, wherein: the two dielectric layers are made of FR4, the dielectric constant is 4.3, the loss tangent value is 0.025, the side length p of the dielectric layer is 17mm, and the thickness h is 1.8 mm.
7. The solid state plasma mediated based multifunctional super surface of claim 1, wherein: the bottom layer metal reflecting plate is made of copper, and the thickness t is 0.1 mm; and the thickness of all the solid plasma resonance units is t0.1 mm.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112688074A (en) * | 2020-12-11 | 2021-04-20 | 南京邮电大学 | Adjustable signal radome based on multilayer structure |
| CN113036443A (en) * | 2021-03-04 | 2021-06-25 | 西安电子科技大学 | Optically transparent electromagnetic super-surface for reducing broadband and wide-angle RCS |
| CN114460726A (en) * | 2022-01-30 | 2022-05-10 | 华中科技大学 | Achromatic optical zoom system based on double-layer medium super surface |
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2019
- 2019-11-19 CN CN201921997657.4U patent/CN211265719U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112688074A (en) * | 2020-12-11 | 2021-04-20 | 南京邮电大学 | Adjustable signal radome based on multilayer structure |
| CN112688074B (en) * | 2020-12-11 | 2022-11-11 | 南京邮电大学 | Adjustable signal radome based on multilayer structure |
| CN113036443A (en) * | 2021-03-04 | 2021-06-25 | 西安电子科技大学 | Optically transparent electromagnetic super-surface for reducing broadband and wide-angle RCS |
| CN114460726A (en) * | 2022-01-30 | 2022-05-10 | 华中科技大学 | Achromatic optical zoom system based on double-layer medium super surface |
| CN114460726B (en) * | 2022-01-30 | 2022-12-02 | 华中科技大学 | Achromatic optical zoom system based on double-layer medium super surface |
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