CN117543215A - Accurate tunable frequency selective fabric and method of making same - Google Patents
Accurate tunable frequency selective fabric and method of making same Download PDFInfo
- Publication number
- CN117543215A CN117543215A CN202311191939.6A CN202311191939A CN117543215A CN 117543215 A CN117543215 A CN 117543215A CN 202311191939 A CN202311191939 A CN 202311191939A CN 117543215 A CN117543215 A CN 117543215A
- Authority
- CN
- China
- Prior art keywords
- fabric
- conductive
- frequency selective
- tunable frequency
- frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004744 fabric Substances 0.000 title claims abstract description 110
- 238000004519 manufacturing process Methods 0.000 title description 8
- 239000004753 textile Substances 0.000 claims abstract description 15
- 230000000737 periodic effect Effects 0.000 claims abstract description 7
- 239000000835 fiber Substances 0.000 claims description 18
- 238000009941 weaving Methods 0.000 claims description 17
- 238000004088 simulation Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- 238000005516 engineering process Methods 0.000 claims description 10
- 238000009987 spinning Methods 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 5
- 244000025254 Cannabis sativa Species 0.000 claims description 3
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 claims description 3
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 claims description 3
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 3
- 229920006052 Chinlon® Polymers 0.000 claims description 3
- 229920000742 Cotton Polymers 0.000 claims description 3
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 229920000297 Rayon Polymers 0.000 claims description 3
- 229920002978 Vinylon Polymers 0.000 claims description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- 239000004760 aramid Substances 0.000 claims description 3
- 229920003235 aromatic polyamide Polymers 0.000 claims description 3
- 235000009120 camo Nutrition 0.000 claims description 3
- 239000004917 carbon fiber Substances 0.000 claims description 3
- 235000005607 chanvre indien Nutrition 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 229920001940 conductive polymer Polymers 0.000 claims description 3
- 239000011487 hemp Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 3
- -1 polypropylene Polymers 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 210000002268 wool Anatomy 0.000 claims description 3
- 229920004934 Dacron® Polymers 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 238000002360 preparation method Methods 0.000 abstract description 7
- 239000004677 Nylon Substances 0.000 description 7
- 229920001778 nylon Polymers 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005670 electromagnetic radiation Effects 0.000 description 3
- 238000009940 knitting Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 229920004933 Terylene® Polymers 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920002292 Nylon 6 Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009954 braiding Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000001755 magnetron sputter deposition Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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
- H01Q15/0046—Theoretical analysis and design methods of such selective devices
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/009—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive fibres, e.g. metal fibres, carbon fibres, metallised textile fibres, electro-conductive mesh, woven, non-woven mat, fleece, cross-linked
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Bioinformatics & Computational Biology (AREA)
- Textile Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Woven Fabrics (AREA)
Abstract
The application relates to an accurate tunable frequency selective fabric and a preparation method thereof, and relates to the field of textiles. The precise tunable frequency selective fabric is formed by a periodic array of conductive units and dielectric units, wherein the conductive units are woven by conductive yarns, and the dielectric units are woven by common yarns without any electromagnetic characteristics; when the current in the conductive unit flows, a magnetic field is generated around the conductive unit, the current flowing in the conductive unit changes, the magnetic field of the conductive unit correspondingly changes, and the resonant frequency of the precisely tunable frequency selective fabric changes; when the external power supply current is zero, the precise tunable frequency selection fabric is restored to the original state, and the resonance frequency is restored to the original state, so that precise regulation and control of the precise tunable frequency selection fabric resonance frequency is realized.
Description
Technical Field
The application relates to the technical field of textile, in particular to an accurate tunable frequency selective fabric and a preparation method thereof.
Background
With the development of technology and the continuous improvement of people's health consciousness, the problem that electromagnetic radiation generated by electronic devices such as mobile phones, computers, microwave ovens is safe and healthy for human body has been attracting more attention. The traditional electromagnetic shielding material can well shield electromagnetic radiation, so that people or instruments are free from the influence of external electromagnetic radiation, but the electromagnetic shielding can not select electromagnetic waves of different frequency bands to shield, so that a novel material for precisely and adjustably shielding the electromagnetic waves of different frequency bands is needed.
The Frequency Selective Surface (FSS) is a single-screen or multi-screen periodic array structure consisting of a large number of resonant cells. FSS is composed of electromagnetic shielding units (patch type) arranged periodically or aperture units (aperture type) arranged periodically on an electromagnetic shielding material. The FFS is equivalent to a spatial filter and can selectively pass or reflect electromagnetic waves in different frequency bands. Therefore, according to the frequency selective characteristics of FFS, a Frequency Selective Fabric (FSF) capable of transmitting electromagnetic waves of a specific frequency band and reflecting electromagnetic waves of other frequency bands can be prepared by using a textile technology. FSF not only has the frequency selection characteristic of FSS, but also has the excellent performances of flexibility, elasticity and the like of textiles, can meet the multi-surface requirements of protection, comfort and the like, and has huge application potential.
At present, much research on FSF focuses on the shape and size of FSS unit structures, as well as the mutual spacing and influence of filtering frequency bands. The patent application (CN 204125790U) describes the preparation of patch-type and aperture-type frequency selective surfaces by locally metallizing a common non-conductive fabric by means of pigment printing to form circular, square and cross patterns. The patent application (CN 112095351B) prepares conductive units on the surface of a non-conductive fabric by using methods such as chemical plating, screen printing, electroplated coating, magnetron sputtering and the like, and prepares the light and thin FSF. The FSF combines the conductive unit and the dielectric unit by using methods such as coating and the like in the manufacturing process, and has poorer permeability, durability and other comfort performance of fabrics, and the FSF still needs to be improved.
The frequency selection frequency band of the FSS is affected by the shape of the conductive units, the interval between the periodic units, electromagnetic parameters of the substrate material and other factors, and FSF with a tunable function can be prepared by changing the factors, so that dynamic response to an external electromagnetic environment is realized. The patent application (CN 113279105A) is to coat conductive materials on the surface of a non-conductive elastic fabric to form an elastic FSF, and the fabric is deformed under the action of external force, so that the size and the conductivity of a conductive unit, the size of a medium unit and the distance between the conductive unit and the medium unit are changed, and the resonance frequency of the FSF is changed. The patent application (CN 112864630 a) weaves three fabrics, namely a fabric formed by compounding two layers of planar FSF, and the FSF is folded or ironed to obtain a fabric with space configuration and a fabric with three-dimensional effect composed of yarns with different shrinkage. When external force is applied, the spatial configuration of the three FSFs changes, the effective distance between two adjacent conductive units perpendicular to the incident direction of the electromagnetic wave changes, or the effective sizes of the conductive units and the dielectric units perpendicular to the incident direction of the electromagnetic wave changes, so that the resonance frequency of the FSFs changes along with the changes. The frequency selection range of the FSF is changed through the action of external force, so that the FSF is inconvenient to use in practical application and the frequency band selection is difficult to control accurately.
Disclosure of Invention
The purpose of the application is to provide an accurate tunable frequency selection fabric and a preparation method thereof, so as to solve the problems that the existing frequency selection fabric is poor in permeability and durability, cannot accurately regulate and control electromagnetic shielding wave bands and is produced in a large scale and at low cost.
In order to achieve the above purpose, the technical scheme adopted in the application is as follows:
in one aspect, the present application provides an accurately tunable frequency selective fabric comprising a periodic array of conductive elements woven from conductive yarns and dielectric elements woven from plain yarns without any electromagnetic properties;
the accurate tunable frequency selection fabric has an initial resonant frequency, the conductive unit has conductivity, and the conductivity indicates that when an external wire of the accurate tunable frequency selection fabric is connected with a power supply, current flows in the conductive unit to form a path circuit; when the current in the conductive unit flows, a magnetic field is generated around the conductive unit, the magnitude of the current flowing in the conductive unit is changed, the magnetic field of the conductive unit is correspondingly changed, and the resonant frequency of the precisely tunable frequency selective fabric is changed; when the external power supply current is zero, the precise tunable frequency selective fabric is restored to the original state, and the resonance frequency is restored to the original state, so that precise regulation and control of the precise tunable frequency selective fabric resonance frequency is realized.
As an alternative embodiment, the precisely tunable frequency selective fabric is an intarsia weave, woven from the conductive yarn and the plain yarn fed through different yarn mouths of a loom.
As an alternative embodiment, the precisely tunable frequency selective fabric has an initial resonant frequency, indicative of:
based on the frequency selective surface principle, frequency selective fabrics of different conductive element shapes and sizes, dielectric element sizes and conductive element to dielectric element spacing are designed, said fabrics having an initial resonant frequency.
As an alternative embodiment, the conductive units and the dielectric units are periodically arranged at a pitch of 0.1mm to 100 mm; the resonant frequency of the precisely tunable frequency selective fabric is tunable in the range of 300MHz to 100 GHz.
As an alternative embodiment, the conductive yarn is a spun yarn formed by metal fiber, metallized fiber, organic electric functional fiber, carbon fiber or intrinsic conductive polymer fiber, or a blended yarn obtained by spinning with other common textile fibers through core spun, doubling or blending.
As an alternative embodiment, the common yarn is a non-conductive pure yarn, a core spun yarn or a doubling yarn obtained by spinning cotton, hemp, silk, wool, terylene, chinlon, polypropylene, acrylic, vinylon, aramid or viscose fiber.
As an alternative embodiment, the conductive unit is a center connection unit, a ring shape, a solid or a composite unit formed of the above shapes.
In another aspect, the present application provides a method of making a precisely tunable frequency selective textile, for making a precisely tunable frequency selective textile as described in any one of the above, comprising:
s1, selecting conductive yarns with an electromagnetic shielding function and common yarns without influence on electromagnetic shielding performance;
s2, conducting units with different shapes and sizes, medium units with different sizes and conducting units with different distances and the medium units are subjected to simulation calculation by using a simulation technology to obtain electromagnetic shielding surfaces with different shielding frequency bands, and an electromagnetic shielding fabric is woven on the basis of the electromagnetic shielding surfaces;
s3, designing different weaving tissues according to the required frequency characteristics and combining the electromagnetic parameters;
s4, selecting a proper weaving degree mesh according to the fineness of the conductive yarns, the fineness of the common yarns and the needle number of the loom so as to ensure that the fabric can be woven smoothly;
s5, selecting the type of the corresponding precise tunable frequency selective fabric for weaving according to the technological parameters designed in the steps S1 to S4 to obtain the precise tunable frequency selective fabric;
s6, simulating the magnitude of a magnetic field generated by flowing through the conductive unit under different current conditions by using a simulation technology, and calculating the relationship between the magnitude of the current and the magnitude of the resonant frequency of the precisely tunable frequency-selective fabric, so that precise regulation and control of the resonant frequency of the precisely tunable frequency-selective fabric are realized.
The beneficial effects that this application provided technical scheme brought include at least:
the accurate tunable frequency selective fabric and the preparation method thereof can change the position of the resonant frequency according to actual requirements. In detail, the corresponding relation between the sizes, the spacing and the shapes of the conductive units and the dielectric units and the current flowing through the conductive units and the resonant frequency is calculated theoretically, and then the magnetic field size of the conductive units is changed by controlling the current of an external power supply, so that the accurate regulation and control of the resonant frequency is realized. In addition, the method combines textile processing means with electromagnetism, realizes accurate and controllable frequency selection of the resonance frequency of the fabric, and has the advantages of comfort, durability, low cost and mass production.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate the application and together with the embodiments of the application, and not constitute a limitation to the application. In the drawings:
FIG. 1 is a flow chart of a method of making a precisely tunable frequency selective fabric provided in accordance with a second embodiment of the present application;
FIG. 2 shows a schematic structural diagram of a precisely tunable frequency selective fabric provided in accordance with a third embodiment of the present application;
FIG. 3 shows a simulated simulation of an accurately tunable frequency selective fabric provided in accordance with embodiment III of the present application;
FIG. 4 shows a schematic top-level diagram of a textile structural material of a precisely tunable frequency selective fabric provided in accordance with a third embodiment of the present application;
fig. 5 shows a schematic structural diagram of a cross-shaped tunable frequency selective fabric provided in accordance with a third embodiment of the present application;
fig. 6 shows an electromagnetic transmission coefficient curve of a cross-shaped tunable frequency selective fabric provided in accordance with a third embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The present application is further described below with reference to the drawings and examples.
Embodiment one:
the application provides an accurate tunable frequency selective fabric formed by a periodic array of conductive elements and dielectric elements.
In some embodiments, the precisely tunable frequency selective fabric is formed of a periodic array of conductive elements and dielectric elements, indicating that the conductive elements and the dielectric elements are periodically arranged at a spacing of 0.1mm to 100 mm; the resonant frequency of the precisely tunable frequency selective fabric is adjustable in the range of 300 MHz-100 GHz.
The conductive unit is formed by weaving conductive yarns, and the medium unit is formed by weaving common yarns without any electromagnetic characteristics.
Optionally, the conductive yarn is a blended yarn formed by spinning metal fibers, metallized fibers, organic electronic functional fibers, carbon fibers or intrinsic conductive polymer fibers, or obtained by spinning with other common textile fibers in a core-spun, doubling or blending manner. The common yarn is non-conductive pure yarn, core spun yarn or doubling yarn obtained by spinning cotton, hemp, silk, wool, terylene, chinlon, polypropylene, acrylic, vinylon, aramid or viscose fiber.
Preferably, the precisely tunable frequency selective fabric is an intarsia weave, woven from conductive yarn and plain yarn fed through different yarn mouths of the loom. Therefore, the precisely tunable frequency selective fabric has better comfort in use than traditional coated, printed frequency selective fabrics, and has the same flexibility, elasticity, permeability and durability as conventional fabrics.
Notably, the precisely tunable frequency selective fabric has an initial resonant frequency, indicative of: based on the frequency selective surface principle, frequency selective fabrics of different conductive element shapes and sizes, dielectric element sizes and conductive element to dielectric element spacing are designed, the frequency selective fabrics having an initial resonant frequency.
It should be noted that, the conductive unit has conductivity, and the conductivity indicates that when the external wire of the precisely tunable frequency selective fabric is connected with the power supply, the current flows in the conductive unit to form a path circuit; when the current in the conductive unit flows, a magnetic field is generated around the conductive unit, the current flowing in the conductive unit changes, and the magnetic field of the conductive unit correspondingly changes; because the magnetic field generated by the conductive unit changes, the resonant frequency of the precisely tunable frequency-selective fabric changes, when the external power supply current is zero, the precisely tunable frequency-selective fabric is restored to the original state, and the resonant frequency also returns to the original state, so that precise regulation and control of the resonant frequency of the precisely tunable frequency-selective fabric are realized.
As an alternative embodiment, the conductive element is a center-connected element, a ring-shaped element, a solid element or a composite element formed from the above shapes. The precisely tunable frequency selective fabric may be tunable in frequency by connecting conductive yarns with a single conductive element or a combination of conductive elements.
In summary, the precise tunable frequency selective fabric provided by the present application may change the position of the resonant frequency according to the actual requirements. In detail, the corresponding relation between the sizes, the spacing and the shapes of the conductive units and the dielectric units and the current flowing through the conductive units and the resonant frequency is calculated theoretically, and then the magnetic field size of the conductive units is changed by controlling the current of an external power supply, so that the accurate regulation and control of the resonant frequency is realized. In addition, the method combines textile processing means with electromagnetism, realizes accurate and controllable frequency selection of the resonance frequency of the fabric, and has the advantages of comfort, durability, low cost and mass production.
Embodiment two:
fig. 1 shows a flowchart of a method for preparing a precisely tunable frequency selective fabric according to a second embodiment of the present application, where the method for preparing a precisely tunable frequency selective fabric according to the first embodiment includes the following steps:
s1, selecting conductive yarns with an electromagnetic shielding function and common yarns without influence on electromagnetic shielding performance;
s2, performing simulation calculation on conductive units with different shapes and sizes, medium units with different sizes and conductive units and medium units with different distances by using a simulation technology to obtain electromagnetic shielding surfaces with different shielding frequency bands, and weaving electromagnetic shielding fabrics based on the electromagnetic shielding surfaces;
step S3, designing different weaving tissues according to the required frequency characteristics and combining the electromagnetic parameters;
step S4, selecting proper weaving degree mesh according to the fineness of the conductive yarns, the fineness of the common yarns and the needle number of the loom so as to ensure that the fabric can be woven smoothly;
step S5, selecting the type of the corresponding precise tunable frequency selective fabric for weaving according to the technological parameters designed in the steps S1 to S4 to obtain the precise tunable frequency selective fabric;
and S6, simulating the magnitudes of magnetic fields generated by the conductive units under different current conditions by using a simulation technology, and calculating the relation between the magnitudes of the currents and the resonant frequency of the precisely tunable frequency-selective fabric, so as to realize precise regulation and control of the resonant frequency of the precisely tunable frequency-selective fabric.
For a better understanding of the present application, the present application will be further described with reference to the drawings and one specific embodiment. It should be noted that the embodiments described in this specific embodiment are only some embodiments of the present application, and do not limit the scope of protection of the present application.
Embodiment III:
the present embodiment provides a method for preparing the precisely tunable frequency selective fabric of embodiment one, comprising the steps of:
step S1, yarn preparation: yarns are selected for braiding the conductive elements and the dielectric elements.
In this embodiment, as shown in fig. 4, during the weaving process, the first yarn nozzle 3 is brought into the nylon 5 weaving medium unit, and the second yarn nozzle 4 is brought into the silver-plated nylon 6 weaving conductive unit; the first yarn jet 3 and the second yarn jet 4 are looped on the front needle bed 7 and the back needle bed 8 respectively to form an interlock structure.
In the embodiment, the yarns used are 100D silver-plated nylon single yarn and 70D common nylon single yarn, and in order to facilitate knitting, the silver-plated nylon single yarn and the common nylon single yarn are respectively twisted into 600D silver-plated nylon strands 3 and 630D nylon strands 4, and the twisting numbers are 50 twists/m.
Step S2, tissue design: the shape of the conductive unit is selected, the required size of the conductive unit, the size of the medium unit and the distance between the conductive unit and the medium unit are calculated through a simulation technology, and finally the tissue structure is determined.
In this embodiment, as shown in fig. 2, in the drawing: 1. the medium unit, 2, the conductive unit, D, m, n are fabric dimension marks; the conductive unit 2 of this embodiment is cross-shaped, the fabric unit size of this embodiment is d=25 mm, m=17 mm, n=3 mm, and the weave structure of this embodiment is a double-sided applique weave.
Step S3, weaving a fabric: drawing a plate making process of the tunable frequency selective fabric in a plate making system matched with a computerized flat knitting machine, and setting corresponding technological parameters such as degree, speed, yarn nozzle and the like according to yarn fineness and a tissue structure.
In this embodiment, as shown in fig. 3, in the drawing: 1. a medium unit, a conductive unit; the tunable frequency selective fabric is woven by a domestic 14-needle double-needle bed computerized flat knitting machine (model KSC-132), and the whole weaving process is carried out at a constant speed of a slow car. To facilitate the shielding performance test, the size of the tunable frequency selective fabric woven in this example was 350 x 350mm.
Step S4, simulation calculation: through simulation technology, the change rule of the resonant frequency of the tunable frequency selective fabric in the embodiment when the current flows through the conductive unit is calculated.
Step S5, electrifying test: the tunable frequency selective fabric woven by the embodiment is externally connected with a direct current power supply, the current of the power supply is changed, the relation between the current flowing through the conductive unit and the resonance frequency is tested, and whether the relation accords with the simulation calculation rule or not is compared.
And (3) effect verification:
as shown in fig. 5, in the drawing: 1. the medium unit, 2, the conductive unit, D, m, n are fabric dimension marks; each column of conductive units 2 of the tunable frequency selective fabric prepared in the third embodiment is connected to a power supply, respectively. And different magnitudes of currents are fed into the conductive units 2 in different columns or the conductive units are not fed at all according to the requirements, so that the frequency selection of the same piece of fabric with different frequency bands in different areas is realized.
As shown in fig. 6, in the drawing: the abscissa f is the frequency in GHz; the ordinate S21 is the transmission coefficient in dB; it can be seen that in the frequency band of 2-18GHz, when the fabric is stretched to 30% deformation along the weft direction, the resonance frequency can be changed from 14.07GHz to 12.13GHz; and when 15V alternating current is supplied to the fabric, the resonance frequency of the fabric can be changed from 14.07GHz to 14.91GHz.
In summary, the precise tunable frequency selective fabric and the preparation method thereof provided by the application can change the position of the resonant frequency according to actual requirements. In detail, the corresponding relation between the sizes, the spacing and the shapes of the conductive units and the dielectric units and the current flowing through the conductive units and the resonant frequency is calculated theoretically, and then the magnetic field size of the conductive units is changed by controlling the current of an external power supply, so that the accurate regulation and control of the resonant frequency is realized. In addition, the method combines textile processing means with electromagnetism, realizes accurate and controllable frequency selection of the resonance frequency of the fabric, and has the advantages of comfort, durability, low cost and mass production.
The foregoing is merely a preferred embodiment of the present application, and it should be noted that: it will be apparent to those skilled in the art that numerous modifications and variations can be made thereto without departing from the principles of the present application, and such modifications and variations are to be regarded as being within the scope of the application.
Claims (8)
1. The precise tunable frequency selective fabric is formed by a periodic array of conductive units and dielectric units, and is characterized in that the conductive units are woven by conductive yarns, and the dielectric units are woven by common yarns without any electromagnetic characteristics;
the accurate tunable frequency selection fabric has an initial resonant frequency, the conductive unit has conductivity, and the conductivity indicates that when an external wire of the accurate tunable frequency selection fabric is connected with a power supply, current flows in the conductive unit to form a path circuit;
when the current in the conductive unit flows, a magnetic field is generated around the conductive unit, the magnitude of the current flowing in the conductive unit is changed, the magnetic field of the conductive unit is correspondingly changed, and the resonant frequency of the precisely tunable frequency selective fabric is changed; when the external power supply current is zero, the precise tunable frequency selective fabric is restored to the original state, and the resonance frequency is restored to the original state, so that precise regulation and control of the precise tunable frequency selective fabric resonance frequency is realized.
2. The precisely tunable frequency selective fabric of claim 1, wherein the precisely tunable frequency selective fabric is an applique weave woven from the conductive yarn and the plain yarn fed through different yarn mouths of a loom.
3. The precisely tunable frequency selective fabric of claim 1, wherein the precisely tunable frequency selective fabric has an initial resonant frequency indicative of:
based on the frequency selective surface principle, frequency selective fabrics of different conductive element shapes and sizes, dielectric element sizes and conductive element to dielectric element spacing are designed, said fabrics having an initial resonant frequency.
4. The precisely tunable frequency selective fabric of claim 1, wherein the conductive elements are periodically arranged with the dielectric elements at a spacing of 0.1mm to 100 mm;
the resonant frequency of the precisely tunable frequency selective fabric is tunable in the range of 300MHz to 100 GHz.
5. The precisely tunable frequency selective fabric of claim 1, wherein the conductive yarn is a spun yarn formed from metal fibers, metallized fibers, electro-mechanical functional fibers, carbon fibers, or intrinsically conductive polymer fibers alone or in combination with other common textile fibers by spun yarn means of sheath, staple or blend spinning.
6. The precisely tunable frequency selective fabric of claim 1, wherein the common yarn is a non-conductive pure, core spun or doubled yarn obtained by spinning cotton, hemp, silk, wool, dacron, chinlon, polypropylene, acrylic, vinylon, aramid or viscose fibers.
7. The precisely tunable frequency selective fabric of claim 1, wherein the conductive elements are center-connected elements, annular, solid, or composite elements formed from the foregoing shapes.
8. A method of preparing a precisely tunable frequency selective textile, for preparing a precisely tunable frequency selective textile as defined in any one of claims 1 to 7, the method comprising:
s1, selecting conductive yarns with an electromagnetic shielding function and common yarns without influence on electromagnetic shielding performance;
s2, conducting units with different shapes and sizes, medium units with different sizes and conducting units with different distances and the medium units are subjected to simulation calculation by using a simulation technology to obtain electromagnetic shielding surfaces with different shielding frequency bands, and an electromagnetic shielding fabric is woven on the basis of the electromagnetic shielding surfaces;
s3, designing different weaving tissues according to the required frequency characteristics and combining the electromagnetic parameters;
s4, selecting a proper weaving degree mesh according to the fineness of the conductive yarns, the fineness of the common yarns and the needle number of the loom so as to ensure that the fabric can be woven smoothly;
s5, selecting the type of the corresponding precise tunable frequency selective fabric for weaving according to the technological parameters designed in the steps S1 to S4 to obtain the precise tunable frequency selective fabric;
s6, simulating the magnitude of a magnetic field generated by flowing through the conductive unit under different current conditions by using a simulation technology, and calculating the relationship between the magnitude of the current and the magnitude of the resonant frequency of the precisely tunable frequency-selective fabric, so that precise regulation and control of the resonant frequency of the precisely tunable frequency-selective fabric are realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311191939.6A CN117543215A (en) | 2023-09-14 | 2023-09-14 | Accurate tunable frequency selective fabric and method of making same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311191939.6A CN117543215A (en) | 2023-09-14 | 2023-09-14 | Accurate tunable frequency selective fabric and method of making same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117543215A true CN117543215A (en) | 2024-02-09 |
Family
ID=89794534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311191939.6A Pending CN117543215A (en) | 2023-09-14 | 2023-09-14 | Accurate tunable frequency selective fabric and method of making same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117543215A (en) |
-
2023
- 2023-09-14 CN CN202311191939.6A patent/CN117543215A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Cheng et al. | Electromagnetic shielding effectiveness of stainless steel/polyester woven fabrics | |
| US7849888B2 (en) | Surface functional electro-textile with functionality modulation capability, methods for making the same, and applications incorporating the same | |
| US8505474B2 (en) | Electrically conductive metal composite embroidery yarn and embroidered circuit using thereof | |
| Perumalraj et al. | Electromagnetic shielding effectiveness of doubled copper-cotton yarn woven materials | |
| KR101015563B1 (en) | Electrically conductive metal composite embroidery yarn and embroidered circuit using thereof | |
| CN106149162A (en) | A kind of Electromagnetically shielding fabrics with electric conductivity periodic structure and preparation method | |
| Ciesielska-Wróbel et al. | Estimation of the EMR shielding effectiveness of knit structures | |
| CN101688336A (en) | Electromagnetic wave suppression flat yarn, electromagnetic wave suppression product using same, and methods for fabricating them | |
| Sancak et al. | The effects of fabric and conductive wire properties on electromagnetic shielding effectiveness and surface resistivity of interlock knitted fabrics | |
| CN110230142A (en) | A kind of machine-knitted structure resistance-type carbon fiber-containing fabric sensor and its application | |
| CN106245184A (en) | There is frequency D periodic structure fabric selecting transparency and preparation method thereof | |
| Lai et al. | High-strength conductive yarns and fabrics: Mechanical properties, electromagnetic interference shielding effectiveness, and manufacturing techniques | |
| KR100943303B1 (en) | Manufacturing method of electromagnetic shielding fabric with covered yarn | |
| CN112864630A (en) | Extensible tunable frequency selection fabric and preparation method thereof | |
| CN102345196B (en) | Electromagnetic shielding braided fabric of carbon filament covering yarn and application of electromagnetic shielding braided fabric | |
| CN117543215A (en) | Accurate tunable frequency selective fabric and method of making same | |
| KR20030061535A (en) | Electromagnetic Wave Shield Fabrics Comprising Stainless Steel Metal Yarns | |
| CN216993359U (en) | Selective electromagnetic shielding/puncture-proof dual-function composite material | |
| CN201347478Y (en) | Electromagnetic shielding silk fabric | |
| KR101977213B1 (en) | The electro magnetic wave shielding fabric and manufacture method thereof | |
| CN112626690B (en) | Preparation method of camouflage fabric based on knitting process, product and application thereof | |
| CN106811988A (en) | Frequency selection stereo fabric based on cut velvet and looped pile periodic structure | |
| CN201842938U (en) | Elastic antistatic warp knitted fabric | |
| Xiao et al. | Electromagnetic function textiles | |
| Jagatheesan et al. | Development of metallic core-spun yarns and hybrid conductive fabrics for electromagnetic shielding applications |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |