CN112864630B - Expandable tunable frequency selective fabric and preparation method thereof - Google Patents
Expandable tunable frequency selective fabric and preparation method thereof Download PDFInfo
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Classifications
-
- 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
- H01Q15/002—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 being reconfigurable or tunable, e.g. using switches or diodes
-
- 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
-
- 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
- H01Q15/0046—Theoretical analysis and design methods of such selective devices
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Bioinformatics & Computational Biology (AREA)
- Woven Fabrics (AREA)
Abstract
The invention discloses a deployable tunable frequency selective fabric and a preparation method thereof. The expandable Tunable Frequency Selective Fabric (TFSF) is formed by a periodic array of conductive units and dielectric units, has extensibility and recoverability, and has a resonant frequency which can be regulated and controlled within a certain frequency range. When an external force is applied, the space configuration of the TFSF can be changed, electromagnetic parameters, actual shapes and actual sizes of the conductive units and the dielectric units are unchanged in the changing process, but the effective spacing between the units is changed, and the resonant frequency is changed along with the change; after the external force is removed, when the resonance frequency is restored to the original state, the resonance frequency is restored to the original position. And stretching the TFSF to a specific size according to the unit size corresponding to the designed resonant frequency, and performing frequency selective regulation. The TFSF is intelligent and controllable, has flexibility and flexibility of fabrics, and can be widely applied to products such as electromagnetic protection, radar communication, radomes, flexible explosion-proof tanks and the like.
Description
Technical Field
The invention relates to a stretchable tunable frequency selective fabric and a preparation method thereof, and belongs to the technical textile field.
Background
The frequency selective surface (Frequency Selective Surface, FSS) is formed by a periodic array of conductive and dielectric elements, and is largely of the two broad categories, patch and aperture. FSS is equivalent to a spatial filter, and can selectively transmit or reflect electromagnetic waves at resonance frequency points. FSS prepared by the traditional processing means only has single resonant frequency due to the electromagnetic property and fixed structure of the material, and cannot be regulated and controlled according to the external electromagnetic environment. Because of the increasing complexity of the external electromagnetic environment and the changeable working state, the FSS with single resonant frequency can not meet the working requirement; and there is a risk that insufficient machining accuracy affects the FSS frequency selection effect. FSS with tunable function can make proper regulation and control for the complex electromagnetic environment outside while compensating errors caused by the limitation of processing precision.
The size of the conductive units, the spacing between the periodic units and the electromagnetic parameters of the substrate material can be changed by utilizing the control of mechanical action or external voltage and the like, the FSS with a tunable function is prepared, and the dynamic response to the external electromagnetic environment is realized. For example, a varactor is introduced between units in the Chinese patent 201710201798.X, and the equivalent capacitance in the units is changed through the excitation of the applied voltage, so that the continuous adjustment of the resonance frequency is realized; the Chinese patent 201821154808.5 introduces a switching diode between the units, and changes the electric size of the units through the on-off control of the diode, so as to realize the switching of the FSS between the transmission state and the cut-off state; the chinese patent 201910262624.3 heats the substrate Barium Strontium Titanate (BST) film by using a thermal modulation mechanism, and realizes the frequency reconstruction of terahertz by changing the dielectric constant of the substrate material. The above patents are merely illustrative of their properties, but do not provide too much description of other properties such as flexibility, strength, etc. For applications in electromagnetic protection, personal communication, curved surface conformality, etc., FSS is required to have a certain curvature or flexibility while achieving a tunable function. The Chinese patent 201910309529.4 uses polyimide or polyester film as a base material to prepare flexible FSS, and compared with the FSS with a curved surface structure, the FSS has simpler process and better performance, but does not relate to a tunable function; the Chinese patent 201921561654.6 prepares flexible FSS with graphene as a conductive unit on an ethylene glycol phthalate substrate, and can realize tuning in the microwave even terahertz field by externally applying bias voltage, but the graphene sheet prepared by the method has more defects, and the preparation of large-size graphene sheet is difficult and the cost is high.
The traditional textile materials are mostly wave-transparent materials, and light and flexible electromagnetic functional fabrics with certain frequency selection characteristics can be prepared by utilizing local metallization. As in chinese patent 201410473103.X, the planar frequency selective surface prepared by performing a localized metallization treatment on the fabric surface has a filter characteristic; the three-dimensional periodic structure fabric prepared by the carpet tufting loom in China patent 201510970380.6 is simple to prepare and can realize large-scale production. Most of the research on textile-based FSS is mainly focused on the preparation and performance.
Disclosure of Invention
The invention aims to provide a stretchable tunable frequency selective fabric (Tunable Frequency Selective Fabric, TFSF) and a preparation method thereof, which overcome the defects that the resonance frequency of the existing textile base frequency selective surface is single and cannot be regulated according to an external electromagnetic environment and the difference of frequency selective characteristics caused by the defect of insufficient processing precision.
The invention provides a deployable tunable frequency selective fabric, which is formed by a conductive unit and a medium unit periodic array;
The tunable frequency selective fabric has extensibility and recoverability;
the extensibility and the recoverability refer to that when an external force is applied, the spatial configuration of the tunable frequency selective fabric is changed, electromagnetic parameters, actual shapes and actual sizes of the conductive units and the medium units are unchanged in the changing process, but effective distances between two adjacent conductive units perpendicular to the incident direction of electromagnetic waves are changed, or effective sizes of the conductive units and the medium units perpendicular to the incident direction of electromagnetic waves are changed, so that the resonant frequency of the tunable frequency selective fabric is changed along with the change, and after the external force is removed, the resonant frequency of the tunable frequency selective fabric is recovered to an original position when the tunable frequency selective fabric is recovered to an original state, so that the regulation and control of the resonant frequency of the tunable frequency selective fabric are realized;
The conductive unit is composed of a conductive yarn aggregate or a conductive coating;
the medium unit is composed of a common yarn aggregate, and has no electromagnetic property.
Based on the tunable frequency selective fabric, the fabric can be stretched to a specific size according to the unit size corresponding to the designed resonant frequency, and frequency selective regulation and control are performed, so that intelligent controllability of the fabric base frequency selective fabric is realized, the fabric has flexibility and flexibility, can respond to an external complex and changeable electromagnetic environment, and can make up for frequency selective characteristic differences caused by insufficient machining precision.
In the above-mentioned scalable tunable frequency selective fabric, the periodic array means that the conductive units and the dielectric units are periodically arranged at a pitch of 0.1mm to 100 mm;
The resonance frequency of the elastic tunable frequency selective fabric is adjustable and controllable within the range of 300 MHz-100 GHz.
In the expandable tunable frequency selective fabric, the conductive unit is a central connection unit, a ring shape, a solid or a composite unit formed by the shapes;
The center connection type is in a tripolar shape, an anchor shape or a cross shape of a jersey refrigeration;
the ring is a circular ring, a square ring or a hexagonal ring;
the solid is rectangular, circular or polygonal.
In the expandable tunable frequency selective fabric, the conductive yarn is an independent spun yarn formed by metal fibers, metallized fibers, organic electronic functional fibers, carbon fibers or intrinsic conductive polymer fibers, or a blended yarn obtained by a spinning mode of covering, doubling or blending with other common textile fibers;
The conductivity of the conductive yarn is not lower than 10S/m;
the conductive coating is formed by conductive ink or conductive slurry;
the conductive ink or the conductive paste is formed of a conductive paste containing metal powder, a carbon-based conductive paste or a conductive polymer;
The sheet resistance of the conductive coating is not higher than 1000Ω/≡.
In the expandable tunable frequency selective fabric, the metal fiber is any one of stainless steel fiber, iron fiber, copper fiber, iron-cobalt alloy, nickel fiber, cobalt fiber and permalloy fiber;
The metallized fiber is fiber with a surface plated with a metal layer, and comprises silver-plated fiber, nickel-plated fiber and copper-plated fiber;
The organic electro-mechanical functional fiber is a fiber prepared by adding conductive powder or magnetic powder into an organic polymer fiber matrix, wherein the fiber comprises carbon black, graphene conductive fiber, graphite conductive fiber, polyaniline, polythiophene conductive polymer conductive fiber, organic ferrite, carbonyl iron and other magnetic fibers;
the intrinsic conductive polymer fiber is polyaniline, polypyrrole or polythiophene conductive polymer fiber.
In the expandable tunable frequency selective fabric, the common yarn is a pure yarn, a core-spun yarn or a doubling yarn obtained by spinning cotton, hemp, wool, terylene, chinlon, polypropylene, acrylic, vinylon, aramid and/or viscose fibers.
The present invention provides three types of deployable tunable frequency selective fabrics, specifically as follows:
The first is a fabric formed by compounding two layers of plane frequency selective fabrics, wherein the conductive layers of the two layers of plane frequency selective fabrics are relatively attached to each other during compounding, and one layer of plane frequency selective fabric is moved along one direction to generate relative displacement, and the displacement range is half of the effective interval between units;
the shape and the size of the conductive units on the two layers of the plane frequency selective fabric are consistent;
the second is a fabric with a spatial configuration obtained by folding or ironing the planar frequency selective fabric;
the tunable frequency selective fabric can be unidirectionally or bidirectionally stretched along a plane direction so as to change the spatial structure of the fabric, or can be changed from a three-dimensional structure to a plane structure;
The plane frequency selective fabric related to the two types of fabrics refers to a fabric formed by weaving a processing periodic array through the conductive units and the medium units or a periodic array formed by applying conductive substances on a medium substrate through the modes of ink-jet printing, digital printing, screen printing, thermal transfer printing, selective coating, selective chemical plating or magnetron sputtering.
The third is a fabric with three-dimensional effect, which is composed of yarns with different shrinkage rates;
The medium unit is woven by adopting the elastic common yarn, the conductive unit is woven by adopting the conductive yarn without elasticity, and when the fabric is woven on a machine, the common yarn is in a strong straightening state and participates in weaving together with the conductive yarn, the common yarn with elasticity retracts greatly after the fabric is taken off, and the conductive yarn keeps original length and can bulge to form a convex fabric;
The common yarn is made elastic by adding elastic fiber;
the elastic fiber is spandex, self-curling bi-component elastic fiber or polyolefin elastic fiber.
The deployable tunable frequency selective fabric of the present invention may be prepared as follows:
selecting the medium yarn which has no influence on electromagnetic waves and the conductive yarn with electromagnetic function or the conductive ink, slurry or coating, and testing to obtain electromagnetic parameters, sheet resistance and dielectric constants;
according to the required frequency characteristics, combining the electromagnetic parameters, calculating the shape and the size of the designed conductive unit through theory, and carrying out optimal design;
calculating the corresponding relation between the movement variation and the resonant frequency variation;
and selecting the type of the corresponding tunable frequency selective fabric according to the designed structure, unit shape and size and combining the physical and mechanical properties of the medium yarns, the conductive yarns and the ink or the sizing agent for weaving.
The adjustable frequency selective fabric has the adjustable property, and the position of the resonant frequency can be changed according to actual requirements. Through theoretical calculation of the corresponding relation between the sizes, the distances and the shapes of the conductive units and the dielectric units and the electromagnetic parameters and the resonant frequency, the fabric can be stretched to a certain shape by external force, so that the electric size of the material is changed, and the regulation and control of the resonant frequency is realized.
The invention realizes tunable frequency selection fabric through textile processing means design, can endow FSS with flexibility and tunable characteristics, can realize the intellectualization of electromagnetic textiles, and has the advantages of sample preparation diversity, low cost and batch preparation.
Drawings
Fig. 1 is a schematic diagram of a TFSF formed by combining two layers of planar frequency selective fabric (2D FSF) according to the present invention, wherein fig. 1 (a) is a dimensional shape before movement and fig. 1 (b) is a dimensional shape after movement.
Fig. 2 is a schematic view of a TFSF formed from a folded or ironed single layer 2D FSF provided by the present invention, wherein fig. 2 (a) is a dimensional form before stretching and fig. 2 (b) is a dimensional form after stretching.
Fig. 3 is a schematic view of a TFSF with a three-dimensional effect comprising differential shrinkage yarns according to the present invention, wherein fig. 3 (a) is a dimensional form before stretching and fig. 3 (b) is a dimensional form after stretching.
Fig. 4 is a schematic diagram of a TFSF formed from two layers of planar frequency selective fabric (2D FSF) composite prepared in example 1 of the present invention, the conductive elements being cross-shaped.
Fig. 5 is a schematic diagram of a TFSF formed from a two-layer planar frequency selective fabric (2D FSF) composite prepared in accordance with example 2 of the present invention, wherein the conductive elements are square ring shaped.
Fig. 6a schematic representation of a TFSF formed from folding or ironing a single layer 2D FSF prepared in example 3 of the present invention, the conductive elements being cross-shaped.
Fig. 7 is a schematic view of TFSF formed from folding or ironing a single layer 2D FSF prepared in example 4 of the present invention, the conductive elements being in the shape of circles.
Fig. 8 is a schematic diagram of TFSF with three-dimensional effect made of differential shrinkage yarn prepared in example 5 of the present invention, the conductive elements being cross-shaped.
Fig. 9 is a schematic diagram of TFSF with three-dimensional effect made of differential shrinkage yarn prepared in example 6 of the present invention, the conductive elements being dipole-shaped.
FIG. 10 is a graph of the electromagnetic transmission coefficient of a TFSF formed by compounding two layers of planar frequency selective fabric (2D FSF) prepared in example 1 of the present invention, with the abscissa f being frequency in GHz; the ordinate S 21 is the transmission coefficient in dB.
FIG. 11 is a graph of the electromagnetic transmission coefficient of a TFSF formed by compounding two layers of planar frequency selective fabric (2D FSF) prepared in example 1 of the present invention, with the abscissa f being frequency in GHz; the ordinate S 21 is the transmission coefficient in dB.
FIG. 12 is a graph of the electromagnetic transmission coefficient of TFSF formed by folding or ironing a single layer of 2D FSF prepared in example 3 of the present invention, with the abscissa f being frequency in GHz; the ordinate S 21 is the transmission coefficient in dB.
FIG. 13 is a graph of the electromagnetic transmission coefficient of TFSF formed by folding or ironing a single layer of 2D FSF prepared in example 4 of the present invention, with the abscissa f being frequency in GHz; the ordinate S 21 is the transmission coefficient in dB.
FIG. 14 is a graph of electromagnetic transmission coefficient of TFSF with three-dimensional effect, made of differential shrinkage yarn prepared in example 5 of the present invention, with frequency on the abscissa f and GHz; the ordinate S 21 is the transmission coefficient in dB.
FIG. 15 is a graph of electromagnetic transmission coefficient of TFSF with three-dimensional effect, made of differential shrinkage yarn prepared in example 6 of the present invention, with frequency on the abscissa f and GHz; the ordinate S 21 is the transmission coefficient in dB.
Detailed Description
The experimental methods used in the following examples are conventional methods unless otherwise specified.
Materials, reagents and the like used in the examples described below are commercially available unless otherwise specified.
Fig. 1 shows a fabric formed by compositing two layers of planar frequency selective fabric, wherein the conductive layers of the two layers of planar frequency selective fabric are relatively bonded, as shown in fig. 1 (a), and one of the layers of planar frequency selective fabric is moved in one direction to generate a relative displacement, as shown in fig. 1 (b), in which the displacement range is half of the effective spacing between the units. The plane frequency selective fabric is a fabric formed by weaving a periodic array of the conductive units 1 and the dielectric units 2 or a periodic array formed by applying a conductive substance on a dielectric substrate in a mode of ink-jet printing, digital printing, screen printing, thermal transfer printing, selective coating, selective electroless plating or magnetron sputtering.
FIG. 2 shows a fabric having a spatial configuration resulting from the manner in which a planar frequency selective fabric is folded or ironed, as shown in FIG. 2 (a); the tunable frequency selective fabric may be unidirectionally or biaxially stretched in a planar direction to change its spatial structure, or may be changed from a three-dimensional structure to a planar structure, as shown in fig. 2 (b).
Fig. 3 shows a fabric with three-dimensional effect, which is formed by yarns with different shrinkage rates, wherein an elastic common yarn weaving medium unit 2 is adopted, an inelastic conductive yarn is adopted to weave a conductive unit 1, when the fabric is woven on a loom, the common yarn is in a strong straightening state and participates in weaving together with the conductive yarn, the elastic common yarn retracts greatly after the fabric is taken off, the conductive yarn keeps original length and can bulge to form a convex fabric, as shown in fig. 3 (a), the fabric can be stretched and recovered, and a schematic diagram after stretching is shown in fig. 3 (b).
Example 1,
A schematic of a TFSF formed from a two layer planar frequency selective fabric (2D FSF) composite is shown in fig. 4. The fabric substrate is woven fabric which is formed by interweaving 50/10S pure cotton yarns according to a plain weave structure. And (3) digging out a conductive area on the mask, reserving a non-conductive area, plating copper on the surface of the fabric by adopting a magnetron sputtering mode, and removing the mask to form the frequency selective fabric with the conductive unit of a cross patch, wherein the size of the frequency selective fabric is D=16.5 mm, m=12 mm and n=4 mm. In the frequency range of 2-18GHz, the resonant frequency can be shifted from 13.6GHz to 7.8GHz when the frequency selective fabric of one layer is shifted by 4mm, as shown in fig. 10.
EXAMPLE 2,
A schematic of a TFSF formed from a two layer planar frequency selective fabric (2D FSF) composite is shown in fig. 5. The fabric substrate is a woven fabric formed by interweaving 100tex polyester yarns according to a plain weave structure. The conductive silver paste is coated on a fabric substrate in a scraping mode by adopting a 200-mesh screen printing mode to form a frequency selective fabric with a conductive unit being an annular patch, wherein the size of the frequency selective fabric is D=25 mm, m=14 mm and n=6 mm, and thus the curtain or wall decoration fabric is prepared. In the 4-12GHz band, the resonant frequency shifts from 9.6GHz to 8.3GHz when the frequency selective fabric of one layer shifts 4mm, as shown in FIG. 11.
EXAMPLE 3,
A schematic of a TFSF formed from folding or ironing a single layer 2D FSF as shown in fig. 6. The fabric substrate is a pure polyester plain weave fabric with gram weight of 200g, conductive silver paste is coated on the fabric substrate in a screen printing mode of 200 meshes to form a frequency selective fabric with a cross conductive unit, and the size is as follows: d=16.5 mm, m=12 mm, n=4 mm. The ironing treatment is carried out along the middle point between the conductive units, the initial state is a three-dimensional state, and the included angle theta is 90 degrees. When the three-dimensional state is changed to the planar state, the resonance frequency is changed from 15.4GHz to 12.9GHz, as shown in FIG. 12.
EXAMPLE 4,
A schematic of a TFSF formed from folding or ironing a single layer 2D FSF as shown in fig. 7. The fabric substrate was 100g of pure cotton fabric, and for the purpose of prolonging the service life, the surface was treated with a TPU film having a thickness of 0.2mm. And spraying graphene ink with the sheet resistance of 20Ω/≡on a fabric substrate by adopting an ink-jet printing mode to form the frequency selective fabric with the conductive unit being a ring, wherein the size of the frequency selective fabric is D=16 mm, m=6mm and n=4 mm. And carrying out crimping ironing treatment along the middle points among the conductive units to form a three-dimensional unit with an included angle of 40 degrees. When the three-dimensional state is changed to the planar state, the resonance frequency is changed from 12.8GHz to 9.8GHz, as shown in FIG. 13.
EXAMPLE 5,
A schematic diagram of a TFSF with a three-dimensional effect composed of differential shrinkage yarns as shown in fig. 8. The raised fabric is woven by a computerized flat knitting machine, the conductive area is made into a cross unit by silver-plated yarns, and the rest non-conductive area is made of 25% spandex filaments. And (3) adding needles at the positions of the knitting conductive units, wherein the non-conductive areas woven by spandex are contracted, the conductive areas are not contracted, and the conductive areas are stressed and raised to form a raised structure. The dimensions of the conductive elements were d=12.5 mm, m=10 mm, n=2 mm, h=6.25 mm. When the fabric is stretched from a three-dimensional structure to a planar structure, the resonant frequency changes from 15.2GHz to 8.9GHz, as shown in FIG. 14.
EXAMPLE 6,
As shown in a schematic view of TFSF with three-dimensional effect composed of differential shrinkage yarns in fig. 9, the raised fabric woven by the rapier loom, the conductive region was woven in a dipole shape using a stainless steel yarn with a content of 70%, and the remaining non-conductive region was woven using a 30% spandex/nylon core-spun yarn. The non-conductive area woven by spandex of the lower machine of the fabric is contracted, the conductive area is not contracted, and the conductive area is stressed to bulge to form a convex structure. The dimensions of the conductive elements were D x＝15.28mm,Dy = 18mm, m = 12.73mm, n = 2mm, h = 6.365mm. When the fabric is stretched from a three-dimensional structure to a planar structure, the resonant frequency changes from 6.3GHz to 7.6GHz, as shown in FIG. 15.
Claims (8)
1. A scalable tunable frequency selective fabric is formed by a periodic array of conductive elements and dielectric elements;
The tunable frequency selective fabric has extensibility and recoverability;
the extensibility and the recoverability refer to that when an external force is applied, the spatial configuration of the tunable frequency selective fabric is changed, electromagnetic parameters, actual shapes and actual sizes of the conductive units and the medium units are unchanged in the changing process, but effective distances between two adjacent conductive units perpendicular to the incident direction of electromagnetic waves are changed, or effective sizes of the conductive units and the medium units perpendicular to the incident direction of electromagnetic waves are changed, so that the resonant frequency of the tunable frequency selective fabric is changed along with the change, and after the external force is removed, the resonant frequency of the tunable frequency selective fabric is recovered to an original position when the tunable frequency selective fabric is recovered to an original state, so that the regulation and control of the resonant frequency of the tunable frequency selective fabric are realized;
The conductive unit is composed of a conductive yarn aggregate or a conductive coating;
The medium unit is composed of a common yarn aggregate;
The tunable frequency selective fabric is formed by compounding two layers of plane frequency selective fabrics, when compounding, the conductive layers of the two layers of plane frequency selective fabrics are relatively attached, one layer of plane frequency selective fabric is moved along one direction to generate relative displacement, and the displacement range is half of the effective interval between units;
the conductive elements on both layers of the planar frequency selective fabric are identical in shape and size.
2. The deployable tunable frequency selective fabric of claim 1, wherein: the periodic array means that the conductive units and the dielectric units are periodically arranged according to a distance of 0.1 mm-100 mm.
3. The deployable tunable frequency selective fabric according to claim 1 or 2, wherein: the conductive unit is a central connection type unit, an annular, solid or composite unit formed by the shapes;
The center connection type is in a tripolar shape, an anchor shape or a cross shape of a jersey refrigeration;
the ring is a circular ring, a square ring or a hexagonal ring;
the solid is rectangular, circular or polygonal.
4. The deployable tunable frequency selective fabric according to claim 1 or 2, wherein: the conductive yarn is an independent spun yarn formed by metal fibers, metallized fibers, organic electronic functional fibers, carbon fibers or intrinsic conductive polymer fibers, or a blended yarn obtained by a core-spun, doubling or blended spinning mode with other common textile fibers;
The conductivity of the conductive yarn is not lower than 10S/m;
the conductive coating is formed by conductive ink or conductive slurry;
the conductive ink or the conductive paste is formed of a conductive paste containing metal powder, a carbon-based conductive paste or a conductive polymer;
The sheet resistance of the conductive coating is not higher than 1000Ω/≡.
5. The deployable tunable frequency selective fabric of claim 4, wherein: the metal fiber is any one of stainless steel fiber, iron fiber, copper fiber, iron-cobalt alloy, nickel fiber, cobalt fiber and permalloy fiber;
The metallized fiber is fiber with a surface plated with a metal layer, and comprises silver-plated fiber, nickel-plated fiber and copper-plated fiber;
The organic electro-mechanical functional fiber is a fiber prepared by adding conductive powder or magnetic powder into an organic polymer fiber matrix, wherein the fiber comprises carbon black, graphene conductive fiber, graphite conductive fiber, polyaniline, polythiophene conductive polymer conductive fiber, organic ferrite, carbonyl iron and other magnetic fibers;
the intrinsic conductive polymer fiber is polyaniline, polypyrrole or polythiophene conductive polymer fiber.
6. The deployable tunable frequency selective fabric according to claim 1 or 2, wherein: the common yarn is pure yarn, core spun yarn or doubling yarn obtained by spinning cotton, hemp, wool, terylene, chinlon, polypropylene, acrylic, vinylon, aramid and/or viscose fibers.
7. The deployable tunable frequency selective fabric according to claim 1 or 2, wherein: the plane frequency selective fabric is a fabric formed by weaving the conductive unit and the medium unit through a periodic array, or a periodic array formed by applying a conductive substance on a medium substrate through the modes of ink-jet printing, digital printing, screen printing, thermal transfer printing, selective coating, selective chemical plating or magnetron sputtering.
8. A method of making the deployable tunable frequency selective fabric of any one of claims 1-7, comprising the steps of:
Selecting the common yarn which has no influence on electromagnetic waves and the conductive yarn with electromagnetic function or the conductive ink, slurry or coating, and testing to obtain electromagnetic parameters, sheet resistance and dielectric constants;
according to the required frequency characteristics, combining the electromagnetic parameters, calculating the shape and the size of the designed conductive unit through theory, and carrying out optimal design;
calculating the corresponding relation between the movement variation and the resonant frequency variation;
and selecting the type of the corresponding tunable frequency selective fabric according to the designed structure, unit shape and size and combining the physical and mechanical properties of the common yarn, the conductive yarn and the ink or the sizing agent for weaving.
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| CN113981605B (en) * | 2021-11-01 | 2023-02-28 | 东南大学 | Color imaging color-changing fabric based on electronic ink and preparation method |
| CN115621686B (en) * | 2022-12-19 | 2023-03-10 | 中国科学院长春光学精密机械与物理研究所 | Polyaniline-based dual-polarized radar switch device and preparation method thereof |
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