CN114883810A - Miniaturized multi-band polarization insensitive flexible extensible frequency selection surface - Google Patents
Miniaturized multi-band polarization insensitive flexible extensible frequency selection surface Download PDFInfo
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- CN114883810A CN114883810A CN202210569188.6A CN202210569188A CN114883810A CN 114883810 A CN114883810 A CN 114883810A CN 202210569188 A CN202210569188 A CN 202210569188A CN 114883810 A CN114883810 A CN 114883810A
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- 230000010287 polarization Effects 0.000 title claims abstract description 32
- 239000002184 metal Substances 0.000 claims abstract description 35
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- 239000000463 material Substances 0.000 claims description 10
- 230000005684 electric field Effects 0.000 claims description 7
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 6
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 6
- 229920002379 silicone rubber Polymers 0.000 claims description 5
- 230000005672 electromagnetic field Effects 0.000 claims description 3
- -1 polydimethylsiloxane Polymers 0.000 claims description 2
- 239000004945 silicone rubber Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 5
- 238000001914 filtration Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 57
- 238000004088 simulation Methods 0.000 description 6
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- 238000010586 diagram Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000000059 patterning Methods 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
- H01Q15/0026—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective said selective devices having a stacked geometry or having multiple layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
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Abstract
The invention aims to provide a miniaturized multi-band polarization insensitive flexible extensible frequency selection surface, and belongs to the technical field of flexible electronic devices. The frequency selective surface consists of three layers, namely a dielectric layer and metal layers positioned on two sides of the dielectric layer, wherein the pattern structure of the metal layers is a three-order Hilbert type curve. The resulting frequency selective surface has ductile characteristics with a stretch of 20% and the filtering function of the frequency selective surface remains unchanged during the stretching process; and meanwhile, the advantages of multi-band and polarization insensitivity are also achieved.
Description
Technical Field
The invention belongs to the technical field of flexible electronic devices, and particularly relates to a flexible extensible frequency selection surface insensitive to miniaturized multi-band polarization.
Background
A Frequency Selective Surface (FSS) is a single-layer or multi-layer planar structure obtained by two-dimensionally and periodically arranging a large number of identical structural units, and has Frequency Selective characteristics for electromagnetic waves having different operating frequencies, polarization states, and incident angles. The implementation of the periodic cell can be roughly classified into a patch type and a slot type. When the resonance unit is in a resonance state, for the patch type FSS, the electromagnetic wave under the frequency can be totally reflected, and the band-stop characteristic is presented; in the slot FSS, the electromagnetic wave at this frequency is transmitted entirely, and exhibits a band-pass characteristic. The frequency selective surface has such frequency selective characteristics that it has the performance of an electromagnetic wave filter in an open space, and is widely used in the fields of radomes, wireless security shields, multi-frequency antenna systems, and the like.
In the face of increasingly complex application scenes, such as the conformal, expansion and contraction of a curved surface structure and even under the stretching working condition, a new flexible requirement is also put forward on the frequency selection surface. Regarding how to realize a flexible frequency-selective surface, research work at present mainly realizes the application of a frequency-selective surface in a conformal environment through material selection and structural design, for example, Ayan Chatterjee et al (a. Chatterjee, s.k.parui.frequency-dependent directional radiation of monomeric-dielectric absorber using a coherent frequency selective surface [ J ]. IEEE transformations on antenna and radiation, 2017,65(5):2233 2239) utilizes PI as a base material, constructs a flexible frequency-selective surface, applies to a cylindrical surface, and realizes the regulation of a radiation mode by regulating the bending radius of the frequency-selective surface. Mudassar Nauman et al (M.Nauman, R.Saleem, A.K.Rapid, et al.A minor flexible frequency selective surface for x-band applications [ J ]. IEEE Transactions on electronic Compatibility,2016,58(2):419-428) utilize a Rogers ultra-thin laminate as a flexible band-stop frequency selective surface prepared with a base material that can conform perfectly to a developable surface and maintain good shielding properties due to its thinness and excellent toughness. Therefore, the current research on the flexible frequency selection surface is limited to curved surface conformality, and the requirement of more flexibility is difficult to meet, so that it is necessary to design a flexible and extensible frequency selection surface.
Meanwhile, with the continuous development of communication technology, in order to improve the multiplexing performance of communication equipment, two or even more subsystems with different frequency selections are often required to be integrated in the same system, but the problems of coupling and interference among the subsystems are always to be solved urgently, and the currently generally adopted method mainly increases the distance among the subsystems to reduce the interference, which inevitably leads to the difficulty in adapting to the development requirement of miniaturization of the system. In addition, in view of the surface shape of the radome and the detection angle of view of the radar antenna, electromagnetic waves incident on the cover surface have different incident angles and polarization forms, including TE polarization (vertical polarization) and TM polarization (parallel polarization), and therefore, in terms of the application of the radar antenna, the angle and polarization sensitivity of the frequency selective surface to the incident electromagnetic waves determine the stability of the filtering performance of the frequency selective radome.
Therefore, it is important how to design a frequency selective surface so that the surface can combine flexible and extensible performance, multiple frequency bands and polarization insensitivity.
Disclosure of Invention
In view of the problems of the background art, it is an object of the present invention to provide a miniaturized multi-band polarization insensitive flexible, malleable frequency selective surface. The frequency selective surface is formed by periodically arranging a plurality of structural units, each structural unit comprises three layers, a dielectric layer and metal layers positioned on two sides of the dielectric layer, and the pattern of each metal layer is specifically a three-order Hilbert type curve. The obtained frequency selective surface has the advantages of multiple frequency bands and polarization insensitivity while having flexibility and ductility.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a miniaturized multiband polarization insensitive flexible extensible frequency selection surface comprises n multiplied by n structural units, wherein each structure sequentially comprises a first metal layer, a dielectric layer and a second metal layer from top to bottom;
the pattern structure of the first metal layer is a three-order Hilbert fractal curve, the widths of the first metal layer in the electromagnetic wave magnetic field direction and the electric field direction are both s, the distance between two adjacent three-order Hilbert fractal curve units is D, and the line width of the Hilbert fractal curve is w;
the pattern structure of the second metal layer is obtained by rotating the pattern structure of the first metal layer by 90 degrees;
the width and the length of the dielectric layer along the electromagnetic wave magnetic field and the electric field propagation direction are both l, the thickness along the electromagnetic wave magnetic field direction is h, and the dielectric layer is made of a silicon rubber material with good ductility at room temperature.
Further, the rule of the third-order hilbert fractal curve is as follows: a square is equally divided into 8 small squares, the middle points of the small squares are sequentially connected, and each point passes through once.
Further, the silicone rubber material is preferably Polydimethylsiloxane (PDMS).
Further, the thickness h of the dielectric layer affects the specific frequency response frequency points and the number of frequency responses.
Further, preferred parameters in the frequency selective surface are: s is 8.41mm, unit distance D is 1.6mm, line width w of Hilbert fractal curve is 0.15mm, width l of dielectric layer is 10mm, thickness h of dielectric layer along electromagnetic field direction is 1mm
Furthermore, the number n of the structural units is more than or equal to 20.
The mechanism of the invention is as follows: the Hilbert fractal structure has good flexibility in mechanical analysis, and after the rectangular metal sheet is subjected to Hilbert patterning, the bendability can be improved through the sparseness characteristic, and the Hilbert fractal structure also has extensibility; meanwhile, due to the self asymmetry of the Hilbert-type curve, when electromagnetic waves are incident from different directions, the frequency of local resonance of the electromagnetic waves and the fractal structure with the corresponding size is different, so that the sub-wavelength characteristic of the metal structure and the resonance wavelength is realized, and the response to a plurality of electromagnetic wave frequencies is finally realized. In addition, TE polarization is generated when an electric field vector of the electromagnetic wave is perpendicular to the incident plane, TM polarization is generated when the electric field vector of the electromagnetic wave is parallel to the incident plane, TM polarization is generated by the metal layer of the second layer after the metal layer structure of the second layer is rotated by 90 degrees, TM polarization is generated by the metal layer of the second layer when TE polarization is generated by the metal layer of the first layer when a beam of electromagnetic wave in a fixed direction is incident, and polarization insensitivity of the frequency selection surface is realized through the arrangement mode of rotating by 90 degrees.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the frequency selective surface designed by the invention has the advantages that through the selection of the dielectric layer material and the design of the metal layer pattern structure, the frequency selective surface has the extensible characteristic, the stretching rate is 20%, and in the stretching process, the filtering function of the frequency selective surface is kept unchanged within an acceptable range.
2. The frequency selective surface can realize the response of a plurality of frequency points after Hilbert patterning through a specific curve, polarization insensitivity is realized by designing an up-down symmetrical structure rotated by 90 degrees, and the polarization insensitivity of the plurality of frequency points can be realized by adjusting the thickness of a dielectric layer.
Drawings
FIG. 1 is a schematic diagram of a frequency selective surface structure unit according to the present invention.
FIG. 2 is a diagram of a pattern structure of a frequency selective surface metal layer in a frequency selective surface according to the present invention.
FIG. 3 is a graph showing the results of transmission coefficients S11 and S22 obtained by simulation in example 1 of the present invention when the thickness h of the dielectric layer is 1 mm.
Fig. 4 shows the transmission coefficients S11 and S22 obtained by simulation when the thickness h of the dielectric layer of the present invention is 0.2mm and h is 0.6 mm.
Fig. 5 shows the results of transmission coefficients S11 and S22 obtained by simulation when the thickness h of the dielectric layer of the present invention is 2 mm.
Fig. 6 shows the results of transmission coefficients S11 and S22 obtained by simulation of the thickness h of the dielectric layer of the present invention equal to 1.2mm, h equal to 1.4mm and h equal to 0.6 mm.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings.
A miniaturized multiband polarization insensitive flexible extensible frequency selection surface is a patch type frequency selection surface and comprises n x n structural units, a structural schematic diagram of the frequency selection surface is shown in figure 1, and each structural unit is sequentially provided with a first metal layer, a dielectric layer and a second metal layer from top to bottom;
the pattern structure of the first metal layer is a third-order Hilbert fractal curve, the specific pattern structure is shown in FIG. 2, the widths of the first metal layer in the electromagnetic wave magnetic field direction and the electric field direction are both s, the distance between two adjacent third-order Hilbert fractal curve units is D, and the line width of the Hilbert fractal curve is w;
the pattern structure of the second metal layer is obtained by clockwise rotating the pattern structure of the first metal layer by 90 degrees;
the dielectric layer is made of silicon rubber material with good ductility at room temperature.
Example 1
A miniaturized multiband polarization insensitive flexible extensible frequency selective surface comprises 20 multiplied by 20 structural units, wherein each structure is sequentially provided with a first metal layer, a dielectric layer and a second metal layer from top to bottom;
wherein the first metal layer and the second metal layer are made of the same material, and are made of a copper-clad polyimide film (PI/Cu film for short) with a thickness of 52 μm, wherein the metal copper layer has a thickness of 18 μm and an elastic modulus E Cu 119GPa, Poisson's ratio of mu Cu 0.34; the thickness of the polyimide film is t PI 34 μm and E as elastic modulus PI 2.5GPa, Poisson's ratio of mu PI ＝0.34。
The medium layer is PDMS with elastic modulus of E PDMS The dielectric constant epsilon is tested under the condition of 5GHz under the condition of 1MPa r 2.9, a dielectric loss tangent tan δ of 0.02, a width in the electromagnetic wave magnetic field propagation direction of l, a length in the electromagnetic wave electric field direction of l, and a thickness in the electromagnetic wave magnetic field direction of h;
the specific dimensional parameters are as follows: s is 8.41mm, unit distance D is 1.6mm, line width w of Hilbert fractal curve is 0.15mm, width l of dielectric layer is 10mm, and thickness h of dielectric layer along electromagnetic field direction is 1 mm.
CST electromagnetic simulation of this implementation, S of frequency selective surface 11 And S 22 The parametric results are shown in figure 3. As can be seen from the figure, in the frequency range of 2GHz-18GHz, the frequency selective surface with the dielectric layer thickness of 1mm respectively makes frequency response to 4.22GHz and 15.79GHz, namely, realizes dual-band response; furthermore, S of the frequency selective surface 11 And S 22 The parameters are well matched, i.e. polarization insensitivity is achieved.
Example 2
The thickness h of the dielectric layer in example 1 was adjusted, and the frequency selective surface was obtained without changing the rest. Wherein h is adjusted to 0.2mm, 0.6mm, 1.2mm, 1.4mm, 1.6mm and 2 mm.
CST electromagnetic simulation was performed on the frequency selective surface obtained after the dielectric layer thickness was adjusted, and the results are shown in fig. 4, 5, and 6.
As shown in fig. 4, when h is 0.2mm, the frequency selective surface has frequency responses to 4.9GHz and 16.9GHz, respectively; when h is 0.6mm, the frequency selective surface responds to 4.08GHz and 15.5GHz respectively;
as shown in fig. 5, when h is 2mm, the frequency selective surface can generate responses of 5 frequency points, which are 2.11GHz, 4.28GHz, 5.9GHz, 12.96GHz, and 15.88GHz, respectively, and also has polarization insensitivity;
as shown in FIG. 6, a further parameter scan of h between 1mm and 2mm found: when h is 1.2mm and 1.4mm, the responses of 3 same frequency points appear, the responses are respectively 4.26GHz, 12.78GHz and 15.88GHz, and the polarization is insensitive as usual; when h is 1.6mm, responses of 4 th and 5 th frequency points begin to appear, the responses are respectively 2.09GHz and 5.87GHz, and the same polarization is insensitive;
in summary, the variation of the thickness of the dielectric layer mainly affects the response of specific frequency points and the number of frequency responses. When the thickness of PDMS is less than or equal to 1mm, the frequency selection surfaces with different thicknesses can realize the frequency response of 2 frequency points, and the frequency points in response are different; when the thickness of the dielectric layer is within the range of 1mm-1.4mm, the frequency response of 3 frequency points can be generated, and the frequency points of three responses are the same in the case of the thickness being less than 1 mm; when h is 1.6mm-2mm, 2 frequency point responses additionally appear on the basis of 1mm-1.4mm, and finally, polarization insensitive responses of 5 frequency points can be realized. Therefore, the number of frequency point responses and the strength of the frequency responses can be adjusted by controlling the thickness of the dielectric layer.
While the invention has been described with reference to specific embodiments, any feature disclosed in this specification may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise; all of the disclosed features, or all of the method or process steps, may be combined in any combination, except mutually exclusive features and/or steps.
Claims (6)
1. A miniaturized flexible extensible frequency selection surface insensitive to multi-band polarization is characterized by comprising n multiplied by n structural units, wherein each structure sequentially comprises a first metal layer, a dielectric layer and a second metal layer from top to bottom;
the pattern structure of the first metal layer is a three-order Hilbert fractal curve, the widths of the first metal layer in the electromagnetic wave magnetic field direction and the electric field direction are both s, the distance between two adjacent three-order Hilbert fractal curve units is D, and the line width of the Hilbert fractal curve is w;
the pattern structure of the second metal layer is obtained by rotating the pattern structure of the first metal layer by 90 degrees;
the dielectric layer is square, the width is l, the thickness along the direction of the electromagnetic wave magnetic field is h, and the dielectric layer is made of silicon rubber materials with good ductility at room temperature.
2. A flexible malleable frequency selective surface as claimed in claim 1, wherein said third order hubert fractal curve has a law of: a square is equally divided into 8 small squares, the middle points of the small squares are sequentially connected, and each point passes through once.
3. A flexible malleable frequency selective surface as claimed in claim 1 wherein the silicone rubber material is polydimethylsiloxane.
4. A flexible malleable frequency selective surface as claimed in claim 1 wherein the dielectric layer thickness h affects the specific frequency response frequency points and number of frequency responses.
5. A flexible malleable frequency selective surface as claimed in claim 1, characterised in that the specific parameters of the frequency selective surface are: s is 8.41mm, unit distance D is 1.6mm, line width w of Hilbert fractal curve is 0.15mm, width l of dielectric layer is 10mm, and thickness h of dielectric layer along electromagnetic field direction is 1 mm.
6. A flexible malleable frequency selective surface as claimed in claim 1 wherein the number n of structural units is ≥ 20.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117673764A (en) * | 2023-11-09 | 2024-03-08 | 浙江大学 | Mixed super-structure material for high-field magnetic resonance |
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| CN104064840A (en) * | 2014-07-09 | 2014-09-24 | 南京师范大学 | Miniaturization band elimination type frequency selective surface |
| CN105140652A (en) * | 2015-09-17 | 2015-12-09 | 上海大学 | Chiral metamaterial micro unit structure with 90-degree polarization deflection characteristic |
| CN106972277A (en) * | 2016-01-14 | 2017-07-21 | 武汉碧海云天科技股份有限公司 | Electromagnetism Meta Materials |
| CN106973561A (en) * | 2016-01-14 | 2017-07-21 | 武汉碧海云天科技股份有限公司 | Magnetic field shielding Meta Materials |
| CN110911844A (en) * | 2019-11-28 | 2020-03-24 | 电子科技大学 | Inhale and penetrate integrative material with broadband wave-transparent window |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104064840A (en) * | 2014-07-09 | 2014-09-24 | 南京师范大学 | Miniaturization band elimination type frequency selective surface |
| CN105140652A (en) * | 2015-09-17 | 2015-12-09 | 上海大学 | Chiral metamaterial micro unit structure with 90-degree polarization deflection characteristic |
| CN106972277A (en) * | 2016-01-14 | 2017-07-21 | 武汉碧海云天科技股份有限公司 | Electromagnetism Meta Materials |
| CN106973561A (en) * | 2016-01-14 | 2017-07-21 | 武汉碧海云天科技股份有限公司 | Magnetic field shielding Meta Materials |
| CN110911844A (en) * | 2019-11-28 | 2020-03-24 | 电子科技大学 | Inhale and penetrate integrative material with broadband wave-transparent window |
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| CN117673764A (en) * | 2023-11-09 | 2024-03-08 | 浙江大学 | Mixed super-structure material for high-field magnetic resonance |
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