CN110854545B - Frequency band transfer wave absorber based on mercury expansion with heat and contraction with cold regulation - Google Patents
Frequency band transfer wave absorber based on mercury expansion with heat and contraction with cold regulation Download PDFInfo
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- CN110854545B CN110854545B CN201911035251.2A CN201911035251A CN110854545B CN 110854545 B CN110854545 B CN 110854545B CN 201911035251 A CN201911035251 A CN 201911035251A CN 110854545 B CN110854545 B CN 110854545B
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- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 title claims abstract description 99
- 229910052753 mercury Inorganic materials 0.000 title claims abstract description 83
- 239000006096 absorbing agent Substances 0.000 title claims abstract description 41
- 230000008602 contraction Effects 0.000 title claims abstract description 19
- 238000012546 transfer Methods 0.000 title claims abstract description 18
- 230000033228 biological regulation Effects 0.000 title claims abstract description 16
- 239000011521 glass Substances 0.000 claims abstract description 25
- 239000000758 substrate Substances 0.000 claims description 18
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 239000004642 Polyimide Substances 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 abstract description 21
- 230000001276 controlling effect Effects 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000011160 research Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
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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
- H01Q17/008—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems with a particular shape
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- Aerials With Secondary Devices (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention discloses a frequency band transfer wave absorber based on mercury thermal expansion and cold contraction regulation, which comprises a mercury storage tank at the bottom, wherein a resonance unit consisting of a mercury patch and a glass cavity is arranged above the mercury storage tank, the mercury patch comprises a cross mercury ring patch and cross mercury patches arranged around the cross mercury ring patch, a cross glass cavity is arranged in the center of the cross mercury ring patch, and the center of the lower surface of the cross glass cavity is communicated with the center of the upper surface of the mercury storage tank at the bottom through a cylindrical through hole. According to the invention, the quantity and the shape of the mercury resonance units are changed by regulating and controlling the temperature field and utilizing the expansion and contraction of mercury in the cuboid storage tank, so that the characteristic of adjustable wave absorption performance is realized.
Description
Technical Field
The invention relates to a frequency band transfer wave absorber, in particular to a mercury expansion on heating and contraction on cooling adjustable frequency band transfer wave absorber, and belongs to the technical field of microwave devices.
Background
With the advent of the digital and information era, the electromagnetic radiation of electronic network equipment not only reduces the reliability and stability of the equipment, but also gradually worsens the electromagnetic environment and seriously harms human health, and is the fourth major pollution source following water source, air and noise pollution. The terahertz wave has unique electromagnetic property due to the special position, and is widely applied to multiple fields of imaging, biomedical detection, military, communication, astronomical physics and the like. With the development of terahertz science, functional devices such as terahertz absorbers and the like capable of improving the transmission process and performance have caused a hot trend of research.
The terahertz wave is very special in the position of the electromagnetic spectrum, is positioned between millimeter wave (submillimeter wave) and infrared band, is positioned in the cross region of electronics and photonics, and can be generated by the methods of the electronics or the photonics. The terahertz wave has unique electromagnetic property due to the special position, and is widely applied to multiple fields of imaging, biomedical detection, military, communication, astronomical physics and the like. Because few substances which respond to terahertz waves in nature and lack of an effective terahertz wave generation method and a detection method cause the development of the terahertz wave technology to lag behind other wave bands, the terahertz wave technology becomes a relatively lagging wave band in electromagnetic spectrum research and is called a terahertz gap. With the development of terahertz science, the research of the THz wave absorber once becomes the key point of research.
Mercury is liquid metal with good performance at normal temperature, the mercury expansion coefficient is relatively large, the shape structure of the mercury resonance unit can be changed under the manual regulation of an external temperature field, and therefore the wave absorbing performance is changed, and the mercury resonance unit has certain adjustable characteristics. In the previous research of the tunable wave absorber, the mercury expansion with heat and contraction with cold characteristic is not used in the wave absorber field, so that the tunable wave absorber has great development potential.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a frequency band transfer wave absorber based on mercury thermal expansion and cold contraction regulation.
The invention adopts the following technical scheme for solving the technical problems:
the utility model provides a band shift wave absorber based on regulation and control of mercury expend with heat and contract with cold, mercury hold up tank including the bottom, the top of mercury hold up tank has the resonance unit that constitutes by mercury paster and glass chamber, the mercury paster includes cross mercury ring paster and cross mercury ring paster cross mercury paster all around, the center of cross mercury ring paster is equipped with cross glass chamber, cross glass chamber lower surface center is through cylinder through-hole and bottom surface mercury hold up tank upper surface center intercommunication.
Furthermore, the centers of the cross-shaped glass cavity and the cross-shaped mercury ring patch coincide with the center of the upper surface of the medium substrate, and the four cross-shaped mercury patches are symmetrically distributed around the upper surface by taking the center of the upper surface of the medium substrate as a center.
Furthermore, the cross-shaped glass cavity is formed by vertically combining two cuboids with the length a being 59 micrometers, the width b being 10 micrometers and the thickness e being 0.5 micrometers at the center, and the thickness of the cavity wall being 0.05 micrometers; the cross mercury ring patch is formed by removing a small cross mercury patch with the same center from a large cross mercury patch at the center, wherein the large cross mercury patch is formed by vertically combining two cuboids with the length i +2k being 75 micrometers, the width i being 45 micrometers and the thickness e being 0.5 micrometers at the center, and the small cross mercury patch is formed by vertically combining two cuboids with the length j +2k being 69 micrometers, the width j being 39 micrometers and the thickness e being 0.5 micrometers at the center; the cross-shaped mercury patch symmetrically distributed on the periphery of the upper surface is formed by vertically combining cuboids with the length of 15 mu m, the width of 3 mu m and the thickness of 0.5 mu m at the center.
Further, the length x of the cuboid mercury storage tank is 140 μm, the width x is 140 μm, the height y is 16.5 μm, the distance from the bottom layer metal reflecting plate is 1.5 μm, and the diameter r of the upper bottom surface of the cone channel 31 μm, a lower base diameter x of 140 μm, and a height l23.5 μm, the interlayer cross-shaped glass cavity is formed by vertically combining two cuboids with the length i being 126 μm, the width j being 18 μm and the thickness k being 0.25 μm at the center, and the diameter r of the bottom surface of the cylindrical through hole42.5 μm, high l1The upper layer of the cross-shaped glass cavity is composed of two cuboids with the length d being 130 mu m, the width f being 26 mu m and the thickness e being 0.25 mu m, which are vertically combined at the center.
Furthermore, the mercury ring patch and the mercury patch are both arranged in the glass cavity, and the wall thickness of the glass cavity is 0.05 μm.
Furthermore, the dielectric substrate is provided above the metal reflecting plate, wherein the side length p of the dielectric substrate is 164 micrometers, the thickness h of the dielectric substrate is 46 micrometers, the material is polyimide, the loss tangent of the dielectric substrate is 0.02, and the dielectric constant of the dielectric substrate is 2.
Furthermore, the radius of the bottom surface of the cylindrical through hole is 1 μm, and the height of the bottom surface of the cylindrical through hole is 24 μm.
Further, the mercury reservoir has a rectangular shape and functions as a metal reflector, and has a length p of 110 μm, a width p of 110 μm, and a height l of 10 μm.
Furthermore, under the manual regulation and control of an external temperature field, the quantity and the shape of the upper-layer mercury resonance units are changed by utilizing the expansion and contraction of mercury in the cuboid storage tank, and the band transfer wave absorber has two working states, namely an initial state and an expansion state, so that the adjustable characteristic of wave absorbing performance is realized;
when the external temperature is 0 ℃, mercury is only stored in the bottom cuboid mercury storage tank, the state is called as an initial state, in the state, the wave absorber can realize double-frequency point absorption at 2.57THz and 2.96THz frequency points, and meanwhile, narrow-band absorption at 6.37-6.94 THz wave bands is realized, and the relative bandwidth is 9.0%; through external manual heating, the environment temperature of the wave absorber is 25 ℃, the cross-shaped glass cavity in the center of the upper surface is filled with the cylindrical through hole, the state is called an expansion state, the structural unit can absorb a single frequency point at a 3.12THz frequency point under the state, meanwhile, broadband absorption at a 6.06-7.20 THz wave band section is realized, and the relative bandwidth is 17.2%.
Compared with the prior art, the technical scheme of the invention has the following technical effects:
(1) the invention relates to a mercury thermal expansion and cold contraction adjustable frequency band transfer wave absorber, which changes the quantity and the shape of mercury resonance units by utilizing the thermal expansion and cold contraction of mercury in a cuboid storage tank through the regulation of a temperature field, can convert the double-frequency point absorption of the wave absorber at 2.57THz and 2.96THz frequency points and the narrow-band absorption of 6.37-6.94 THz wave bands into the single-frequency point absorption at 3.12THz frequency points and the wide-band absorption at 6.06-7.20 THz wave bands in an expansion state, and realizes the adjustable characteristic of wave absorbing performance.
(2) The invention can realize the absorption of THz wave band electromagnetic wave under smaller physical size, and has the characteristics of flexible design, strong functionality and the like.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a top view of the present invention.
Fig. 3 is a side view of the present invention.
Fig. 4 is an absorption curve of the wave absorber in an initial state when electromagnetic waves are vertically incident in the TE mode.
FIG. 5 is an absorption curve of the microwave absorber in an expanded state and with electromagnetic waves incident perpendicularly in the TE mode.
The reference signs explain: 1. 2, 3 and 4 of a cross-shaped mercury patch, 5 of a cross-shaped mercury ring patch, 6 of a cross-shaped glass cavity, 7 of a cylindrical through hole, 8 of a medium substrate and 9 of a cuboid mercury storage tank.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings
As the design and the principle of the mercury thermal expansion and cold contraction adjustable band transfer wave absorber, the wave absorber utilizes the resonance effect of mercury in the glass cavity on the upper surface of the medium substrate. The upper surface mercury patch consists of 3 parts, namely a central cross-shaped glass cavity 6, a cross-shaped mercury ring patch 5 and cross-shaped mercury patches 1, 2, 3 and 4 distributed on the periphery. The cylindrical through hole 7 is embedded in the medium substrate 8 and is communicated with the upper surface central glass cavity 6 and the bottom layer cuboid mercury storage tank 9. The wave absorber is shown in a schematic perspective view in fig. 1.
According to the mercury thermal expansion and cold contraction adjustable frequency band transfer wave absorber generation method, the resonance unit is an upper surface mercury patch, and the state of the resonance unit is divided into two states, namely an initial state and an expansion state. In the initial state, mercury is stored in the bottom cuboid mercury storage tank 9, and in the expansion state, mercury fills the upper surface cross-shaped glass cavity 6 through the cylindrical through hole 7. Through the regulation and control of temperature field, utilize the expend with heat and contract with cold of mercury in the cuboid hold up tank, change the quantity and the shape of mercury resonance unit, can absorb double frequency point and narrowband with the wave absorber under initial condition, single frequency point absorbs and broadband absorbs when turning into the expanded state, has realized the adjustable characteristic of wave absorption performance.
According to the method for generating the mercury thermal expansion and cold contraction adjustable broadband transfer wave absorber, the wave absorber is highly symmetrical in structure, so that the wave absorber is insensitive to polarization of incident electromagnetic waves, and when the electromagnetic waves are vertically incident (an electric field is along the y-axis direction), the wave absorber is mainly completed through the action of the mercury patch on the upper surface of the medium substrate, so that the frequency band transfer of the absorption wave band of the wave absorber in the THz wave band is realized.
The mercury thermal expansion and cold contraction adjustable broadband transfer wave absorber comprises a mercury-based metal which is liquid at normal temperature, the liquid temperature range is-38.83-356.73 ℃, and the expansion coefficient is 1.8 multiplied by 10-4The adjusting range is large. Meanwhile, the mercury has good conductivity, and the conductivity is less influenced by the temperature, so that the mercury has stable wave-absorbing property under the regulation and control of a temperature field.
The dielectric substrate is made of lossy polyimide, the dielectric constant of the dielectric substrate is 2, and the loss tangent value of the dielectric substrate is 0.02.
Relevant parameters of the wave absorber are shown in the table 1.
| Parameter(s) | a | b | d | e |
| Value (μm) | 59 | 10 | 3 | 0.5 |
| Parameter(s) | f | h | i | j |
| Value (μm) | 15 | 34 | 45 | 39 |
| Parameter(s) | k | l | p | x |
| Value (μm) | 15 | 10 | 110 | 22 |
TABLE 1
Fig. 4 and 5 show absorption curves of the wave absorber in two states, which are highly symmetrical structures, so that the wave absorber is insensitive to polarization of incident electromagnetic waves. The absorptance formula a (ω) is 1-R (ω) -T (ω), where R (ω) represents reflectance and T (ω) represents transmittance, and thus a (ω) is 1-R (ω) -T (ω). FIG. 4 is an absorption curve in an initial state, and the wave absorber achieves double-frequency point absorption at frequency points of 2.57THz and 2.96THz and narrow-band absorption at a wave band of 6.37-6.94 THz. FIG. 5 is an absorption curve in an expansion state, and the wave absorber achieves single-frequency point absorption at a frequency point of 3.12THz and broadband absorption at a wavelength range of 6.06-7.20 THz.
After specific design, the invention can freely regulate and control the wave-absorbing frequency range according to manual needs. The main absorption is caused by the mercury patch on the upper surface of the dielectric substrate, and the electromagnetic wave can be absorbed under a smaller physical size.
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 also intended to be covered by the appended claims. The scope of the invention is defined by the claims and their equivalents.
Claims (6)
1. The utility model provides a frequency band shifts wave absorber based on regulation and control of mercury expend with heat and contract with cold which characterized in that: the mercury patch comprises a mercury storage tank at the bottom, a resonance unit consisting of a mercury patch and a glass cavity is arranged above the mercury storage tank, the mercury patch comprises a cross mercury ring patch and cross mercury patches around the cross mercury ring patch, a cross glass cavity is arranged in the center of the cross mercury ring patch, and the center of the lower surface of the cross glass cavity is communicated with the center of the upper surface of the bottom mercury storage tank through a cylindrical through hole; the centers of the cross-shaped glass cavity and the cross-shaped mercury ring patch coincide with the center of the upper surface of the medium substrate, and the four cross-shaped mercury patches are symmetrically distributed around the upper surface by taking the center of the upper surface of the medium substrate as a center.
2. The mercury thermal expansion and cold contraction regulation-based frequency band transfer wave absorber according to claim 1, wherein: the cross-shaped glass cavity is formed by two long partsa=59 μm, widthbThickness of =10 μmeThe cuboids with the thickness of 0.05 μm are vertically combined at the center to form the rectangular solid with the thickness of 0.5 μm; the cross mercury ring patch is formed by removing a concentric small cross mercury patch from a large cross mercury patch at the center,the big cross-shaped mercury patch is composed of two long piecesi+2k=75 μm, widthi=45 μm, thicknesseRectangular parallels of =0.5 μm are vertically combined at the center, and the small cross-shaped mercury patch is composed of two long piecesj+2k=69 μm, widthj=39 μm, thicknesseRectangular parallelepipeds of =0.5 μm are vertically assembled at the center; the cross-shaped mercury patch symmetrically distributed on the periphery of the upper surface is formed by vertically combining cuboids with the length of 15 mu m, the width of 3 mu m and the thickness of 0.5 mu m at the center.
3. The mercury thermal expansion and cold contraction regulation-based frequency band transfer wave absorber according to claim 1, wherein: the mercury patch is positioned in the glass cavity, and the wall thickness of the glass cavity is 0.05 mu m.
4. The mercury thermal expansion and cold contraction regulation-based frequency band transfer wave absorber according to claim 1, wherein: the length of the dielectric substrate sidep=164 μm, thicknessh=46 μm, made of polyimide, having a loss tangent of 0.02 and a dielectric constant of 2, and disposed above the metal reflector.
5. The mercury thermal expansion and cold contraction regulation-based frequency band transfer wave absorber according to claim 1, wherein: the radius of the bottom surface of the cylindrical through hole is 1 mu m, and the height of the bottom surface of the cylindrical through hole is 24 mu m.
6. The mercury thermal expansion and cold contraction regulation-based frequency band transfer wave absorber according to claim 1, wherein: the mercury storage tank is rectangular and has the function of a metal reflecting platep=110 μm, widthp=110 μm, highl=10 μm。
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| CN112378882A (en) * | 2020-11-06 | 2021-02-19 | 中北大学南通智能光机电研究院 | Terahertz metamaterial liquid phase refractive index sensor based on micro-flow channel |
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| CN108281771A (en) * | 2018-03-22 | 2018-07-13 | 太行通信股份有限公司 | The liquid antenna of beam direction is received and dispatched using GRAVITY CONTROL |
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Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5446459A (en) * | 1991-08-13 | 1995-08-29 | Korea Institute Of Science And Technology | Wide band type electromagnetic wave absorber |
| CN208127412U (en) * | 2018-03-22 | 2018-11-20 | 太行通信股份有限公司 | Utilize the liquid antenna of GRAVITY CONTROL transmitting-receiving beam direction |
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Patent Citations (5)
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|---|---|---|---|---|
| EP0380267A1 (en) * | 1989-01-26 | 1990-08-01 | Minnesota Mining And Manufacturing Company | Microwave absorber employing acicular magnetic metallic filaments |
| CN108281771A (en) * | 2018-03-22 | 2018-07-13 | 太行通信股份有限公司 | The liquid antenna of beam direction is received and dispatched using GRAVITY CONTROL |
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