CN109411899B - Liquid metal wave absorber based on gravity field regulation and control - Google Patents
Liquid metal wave absorber based on gravity field regulation and control Download PDFInfo
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- CN109411899B CN109411899B CN201811374063.8A CN201811374063A CN109411899B CN 109411899 B CN109411899 B CN 109411899B CN 201811374063 A CN201811374063 A CN 201811374063A CN 109411899 B CN109411899 B CN 109411899B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
- H01Q17/007—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems with means for controlling the absorption
Abstract
The invention relates to a liquid metal wave absorber based on gravitational field regulation and control, which comprises a bottom layer metal reflecting plate and a medium substrate with a groove above a metal plate, wherein a first groove and a second groove for placing mercury and oil are formed in the medium substrate, and a communicating part is arranged between the first groove and the second groove. The invention is specially designed, adopts a novel mode that liquid metal is arranged in a medium substrate, and combines a novel gravity field regulation and control means, the position of the liquid metal is changed by rotation, and different absorption frequency points are correspondingly realized by different resonance unit shapes. The invention uses a convenient operation means, and can obtain two different absorption modes and polarization selective absorption only by rotating the wave absorber. The wave absorber is popular in structure and easy to process, and the wave absorber is small and exquisite in structure, flexible in design and wide in application scene.
Description
Technical Field
The invention relates to a wave absorber, in particular to a liquid metal wave absorber based on gravity field regulation and control, and belongs to the field of radio communication and microwave devices.
Background
The metamaterial is an artificial periodic material which does not exist in nature, and has special physical properties which are not possessed by a plurality of common natural materials. Typically, natural materials have positive reflectivity and refractive index, while metamaterials have the opposite, resulting in many extraordinary physical properties. The metamaterial has a plurality of applications in reality, such as manufacturing a perfect stealth coat, a perfect lens, a wave absorber and the like. The metamaterial has smaller physical size, so that the transmission mode of electromagnetic waves can be fundamentally changed according to different designs, the electromagnetic waves of a target waveband are converted and absorbed through modes such as dielectric resonance, electric resonance, magnetic resonance and the like, and the metamaterial is widely applied to the civil and military fields at a near stage. The liquid state, which exists as a particular form of metal, also has a number of properties. The liquid metal has the characteristics of indefinite shape and fluidity, and the liquid metal prepared by mixing different materials is a new type of liquid metal. Liquid metal is also made into liquid machines because of its unique characteristics; the liquid machine can perform high-speed movement for a long time after eating a small amount of substances, realizes autonomous movement without external electric power, and can be used for manufacturing vascular robots, artificial mollusks and the like. The wave absorber manufactured by using liquid metal is a precedent, but is an innovative way by matching with the regulation and control of a gravity field, a means with low consumption and high timeliness is lacked in a plurality of regulation and control means of the wave absorber, temperature regulation and control such as temperature and centralized elements have some defects, the problem of application of the wave absorber in various fields is prevented, and the gravity field is used as a novel non-contact regulation and control means, so that the wave absorber is very convenient and efficient.
The liquid metal wave absorber based on gravitational field regulation adopts an existing efficient regulation and control means, only the wave absorber needs to be rotated, the purpose of regulating and controlling the absorption frequency point is achieved, the absorption frequency point is moved, meanwhile, the absorption in a TE mode and a TM mode is different, and polarization selective absorption is realized. The wave absorber is popular in structure and easy to process, and the wave absorber is small and exquisite in structure, flexible in design and wide in application scene.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a liquid metal wave absorber based on gravity field regulation, which uses a simple gravity field regulation means and realizes dynamic regulation and control of absorption frequency points by rotating the wave absorber.
The invention adopts the following technical scheme for solving the technical problems:
the utility model provides a liquid metal wave absorber based on gravity field regulation and control, includes bottom metal reflecting plate and metal sheet top and takes the notched medium base plate, medium base plate inside has a recess and No. two recesses of placing mercury and fluid, and has the intercommunication portion between a, No. two recesses, through rotatory this wave absorber, under the action of gravity field, the position of liquid metal can change and become door font structure and mouth font structure respectively to realize absorbing the dynamic regulation and control at frequency point.
As a further technical scheme of the invention, the first groove and the second groove in the medium substrate are respectively a door-shaped groove and a mouth-shaped groove.
As a further technical scheme of the invention, the first groove is in a 'door' shape and is positioned inside the medium substrate, and oil is placed inside the first groove; the second groove is in a shape of a mouth and is positioned inside the medium substrate, and liquid metal is placed inside the second groove.
The oil in the first groove has the effect that liquid metal cannot remain in situ after rotation by utilizing insolubility among liquids, and does not play a main resonance effect; and the volumes of the first groove and the second groove are equal.
As a further technical scheme of the invention, the wave absorber has the following states of non-rotation and horizontal rotation:
when the wave absorber does not rotate, the second groove is positioned below the inner part of the medium substrate, the first groove is positioned above the inner part of the medium substrate, the second groove is filled with seawater and the first groove is filled with oil under the action of a gravitational field;
when the wave absorber rotates horizontally, the second groove is located above the inner portion of the medium substrate, the first groove is located below the inner portion of the medium substrate, under the action of a gravity field, the second groove is filled with oil, and the first groove is filled with seawater.
The regulation and control mode is realized by rotation, and the positions of seawater and oil in the medium substrate are changed due to rotation, so that dynamic regulation and control of an absorption frequency domain are realized.
As a further technical scheme of the invention, the structure of the 'door' -shaped groove is a cuboid with the length of 6mm, the width of 5.084mm and the height of 0.05mm, wherein a cuboid with the length of 5mm, the width of 0.8mm, the height of 0.05mm and the length of 5mm, the width of 3.1mm and the height of 0.05mm is dug out; the square groove structure is a cuboid with the length of 6mm, the width of 3.67mm and the height of 0.05mm, wherein a cuboid with the length of 4mm, the width of 2.75mm and the height of 0.05mm is dug out.
As a further technical scheme of the invention, the regulation and control mode is realized by rotation, and the positions of mercury and oil in the medium substrate are changed due to rotation, so that dynamic regulation and control and planned selective absorption of absorption frequency points are realized.
As a further aspect of the invention, the material of the liquid metal is mercury.
As a further technical scheme of the invention, the material of the dielectric substrate is FR-4 with loss tangent.
As a further technical scheme of the invention, the material of the metal reflecting plate is copper.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
(1) the liquid metal wave absorber based on the gravity field regulation and control adopts liquid metal as a metal resonance unit, innovatively combines the gravity field regulation and control with the liquid metal resonance, and encapsulates the liquid metal inside the medium substrate to achieve the effect of the gravity field regulation and control.
(2) The method for realizing the reconstruction (regulation) of the absorption frequency is simpler, and the timeliness and the convenience of regulation are greatly improved.
(3) The invention has special design, realizes the effects of multi-frequency point absorption and polarization selective absorption, and has the characteristics of popular and easy structure, small structure, flexible design, wide application scene and the like.
Drawings
Fig. 1 is a front view of the structural unit of the present invention when not rotated.
Fig. 2 is a front view of a periodic building block arrangement (2 x 2) according to the invention.
Fig. 3 is a side (perspective) view of the structural unit of the present invention when it is not rotated.
Fig. 4 is a perspective view of the present invention when not rotated.
FIG. 5 is a front view of the internal structure of a dielectric substrate when not rotated in accordance with the present invention.
FIG. 6 is a front view of the internal structure of a media substrate during horizontal rotation in accordance with the present invention.
FIG. 7 is a graph showing absorption curves of TE and TM modes of electromagnetic waves incident perpendicularly when the present invention is not rotated.
FIG. 8 is a graph showing absorption curves of TE and TM modes of electromagnetic waves vertically incident when the present invention is rotated horizontally.
Description of the drawings: the manufacturing method comprises the following steps of 1-metal reflecting plate, 2-medium substrate, 3-first groove for placing oil, 4-second groove for placing mercury, 5-oil and 6-mercury.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings:
the invention provides a liquid metal wave absorber based on gravitational field regulation, which is structurally composed of a bottom layer metal reflecting plate, a medium substrate, mercury in the medium substrate and oil, as shown in figures 1 to 4. The material of the dielectric substrate is FR-4. No. one, No. two recesses are "door" style of calligraphy physique and "mouth" style of calligraphy physique that the volume equals respectively, and fluid and mercury are injected respectively to the recess, because the volume of a, No. two recesses equals, and fluid and mercury are mutually insoluble, through rotatory this ripples ware for the position of fluid and mercury changes in the recess, thereby realizes absorbing the regulation and control of frequency point.
The wave absorber has two working states in work, namely a non-rotating state and a horizontal rotating state. When the wave absorber does not rotate, the second groove is positioned below the inner part of the medium substrate, the first groove is positioned above the inner part of the medium substrate, and under the action of a gravity field, the second groove is filled with mercury and the first groove is filled with oil; when the wave absorber rotates horizontally, the second groove is located above the inner portion of the medium substrate, the first groove is located below the inner portion of the medium substrate, under the action of a gravity field, the second groove is filled with oil, and the first groove is filled with mercury.
In the invention, dynamic regulation and control of different frequency points are realized by placing a liquid resonance unit in a medium substrate, taking mercury as a main resonance unit and adopting a method for rotating the wave absorber, and the wave absorber is formed by arranging periodic structural units, as shown in figure 2.
The technical solution of the present invention is further illustrated by the following specific examples:
the liquid metal wave absorber based on gravity field regulation and control has the following two working states: when the substrate is not rotated, the schematic structural diagram is shown in fig. 5, the grooves are placed in the forward direction, at this time, the second groove is located below the inside of the dielectric substrate, and the first groove is located above the inside of the dielectric substrate. As the mercury selected in the wave absorber is not dissolved with the oil, the mercury in the groove and the oil can be layered, and the mercury and the oil are respectively filled in the second groove and the first groove; when the substrate is in a horizontal rotation state, the schematic structural diagram is shown in fig. 6, the grooves are placed in opposite directions, the second groove is located above the inside of the dielectric substrate, the first groove is located below the inside of the dielectric substrate, mercury and oil are filled in the first groove and the second groove respectively, and relevant parameters in all the diagrams are shown in table 1.
The reflecting plate of the wave absorber is an all-copper metal plate.
According to the liquid metal wave absorber based on gravity field regulation and control, due to the fact that certain technical difficulty exists in actual manufacturing, a 3D printing mode is adopted in actual manufacturing.
According to the liquid metal wave absorber based on gravity field regulation, mercury in the medium substrate can be replaced by other liquid metals.
TABLE 1 parameters associated with the wave absorber
| Parameter(s) | a | b | c | d | e |
| Value of parameter (mm) | 12 | 6 | 5.084 | 3.67 | 5 |
| Parameter(s) | f | g | h | i | j |
| Value of parameter (mm) | 0.8 | 3.1 | 4 | 2.75 | 0.32 |
| Parameter(s) | k | l | m | ||
| Value of parameter (mm) | 0.1 | 1 | 0.05 |
As shown in fig. 7 and 8, the absorption curves of the wave absorber in two working states are absorption curves of the wave absorber, and since the wave absorber is polarization sensitive to incident electromagnetic waves, the absorption curves in the following two states both have TE and TM modes, and the electromagnetic waves are incident from the-z direction during working. The absorption formula a (ω) is 1-R (ω) -T (ω), R (ω) represents reflectance, T (ω) represents transmittance, and T (ω) is 0 since the bottom layer is a complete metal reflective plate, and a (ω) is 1-R (ω). FIG. 7 is an absorption curve of the microwave absorber when the microwave absorber is not rotated, in the TE mode, the reflectivity in the frequency band from 11.95GHz to 12.2GHz is lower than-10 dB, the absorptivity is higher than 90%, and the absorption peak values at the absorption frequency point of 12.08GHz are respectively 99.98%; in the TM mode, the reflectivity in a frequency band from 9.14GHz to 9.33GHz and a frequency band from 24.13GHz to 24.23GHz is lower than-10 dB, the absorptivity is higher than 90%, and the absorption peaks at two absorption frequency points of 9.24GHz and 24.18GHz are respectively 99.87% and 99.24%; when the wave absorber rotates horizontally, in a TE mode, the reflectivity in a frequency band from 10.83GHz to 11.05GHz and a frequency band from 24.36GHz to 24.46GHz is lower than-10 dB, the absorptivity is higher than 90%, and the absorption peaks at two absorption frequency points of 10.94GHz and 24.41GHz are respectively 99.76% and 99.86%; in the TM mode, the reflectivity in a frequency band from 7.38GHz to 7.42GHz and a frequency band from 24.11GHz to 24.21GHz is lower than-10 dB, the absorptivity is higher than 90%, and the absorption peaks at two absorption frequency points of 7.41GHz and 24.16GHz are 91.10% and 98.53% respectively; the multi-frequency absorption and polarization selective absorption are realized in a frequency band, so that the purpose of regulating and controlling the absorption frequency domain can be achieved by rotating the wave absorber.
After specific design (the shape of the resonance unit is changed), the working frequency of the invention can be dynamically regulated and controlled. The main absorption is caused by liquid metal as a resonance unit, and the regulation and control of absorption frequency points are realized by an ingenious means.
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 intended to further illustrate the principles of the invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention, which is intended to be protected by the appended claims. The scope of the invention is defined by the claims and their equivalents.
Claims (4)
1. The utility model provides a liquid metal wave absorber based on gravity field regulation and control, includes bottom metal reflecting plate and metal reflecting plate top and has the medium base plate of recess, its characterized in that: the medium substrate is internally provided with a first groove and a second groove for placing mercury and oil, a communicating part is arranged between the first groove and the second groove, and the position of liquid metal is changed under the action of a gravity field by rotating the wave absorber to respectively form a door-shaped structure and a mouth-shaped structure, so that the dynamic regulation and control of absorption frequency points are realized; the first groove and the second groove in the medium substrate are of a door-shaped structure, and the volumes of the first groove and the second groove are equal;
the wave absorber has non-rotating and horizontal rotating states; when the wave absorber does not rotate, the second groove is positioned below the inner part of the medium substrate, the first groove is positioned above the inner part of the medium substrate, and under the action of a gravity field, the second groove is filled with mercury and the first groove is filled with oil; when the wave absorber rotates horizontally, the second groove is located above the inner portion of the medium substrate, the first groove is located below the inner portion of the medium substrate, under the action of a gravity field, the second groove is filled with oil, and the first groove is filled with mercury.
2. The liquid metal wave absorber based on gravitational field regulation and control of claim 1, wherein: the door-shaped structure is a cuboid with the length of 6mm, the width of 5.084mm and the height of 0.05mm, wherein a cuboid with the length of 5mm, the width of 0.8mm, the height of 0.05mm and the length of 5mm, the width of 3.1mm and the height of 0.05mm is dug out; the square-shaped structure is a cuboid with the length of 6mm, the width of 3.67mm and the height of 0.05mm and a cuboid with the length of 4mm, the width of 2.75mm and the height of 0.05 mm.
3. The liquid metal wave absorber based on gravitational field regulation of claim 1, wherein the dielectric substrate is FR-4 with a loss tangent.
4. The liquid metal wave absorber based on gravitational field regulation of claim 1, wherein the material of the metal reflector plate is copper.
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| CN201811374063.8A CN109411899B (en) | 2018-11-19 | 2018-11-19 | Liquid metal wave absorber based on gravity field regulation and control |
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| CN201811374063.8A CN109411899B (en) | 2018-11-19 | 2018-11-19 | Liquid metal wave absorber based on gravity field regulation and control |
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| CN109411899B true CN109411899B (en) | 2021-05-04 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110212308B (en) * | 2019-06-11 | 2020-12-29 | 南京邮电大学 | Gravity field tunable ultra-wideband wave absorber based on liquid metal |
| CN110635249B (en) * | 2019-09-05 | 2021-03-16 | 南京邮电大学 | Broadband transfer wave absorber based on mercury expansion with heat and contraction with cold regulation |
| CN110854545B (en) * | 2019-10-29 | 2021-03-16 | 南京邮电大学 | Frequency band transfer wave absorber based on mercury expansion with heat and contraction with cold regulation |
| CN111564701B (en) * | 2020-05-20 | 2021-03-23 | 西安电子科技大学 | Frequency selective surface structure suitable for various refrigerant regular flow channels and capable of dissipating heat |
| CN111900548B (en) * | 2020-08-28 | 2021-06-25 | 西安电子科技大学 | Ultra-wideband low-scattering metamaterial based on combination of wave-absorbing material and super surface |
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