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WO2011096607A1 - Frequency selective filter - Google Patents

Frequency selective filter Download PDF

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Publication number
WO2011096607A1
WO2011096607A1 PCT/KR2010/000753 KR2010000753W WO2011096607A1 WO 2011096607 A1 WO2011096607 A1 WO 2011096607A1 KR 2010000753 W KR2010000753 W KR 2010000753W WO 2011096607 A1 WO2011096607 A1 WO 2011096607A1
Authority
WO
WIPO (PCT)
Prior art keywords
conductor
frequency selective
selective filter
wick
core yarn
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.)
Ceased
Application number
PCT/KR2010/000753
Other languages
French (fr)
Inventor
Sang Hun Shin
Yoo Yong Lee
Moung Shik Won
Tae Hak Park
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Agency for Defence Development
Original Assignee
Agency for Defence Development
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Agency for Defence Development filed Critical Agency for Defence Development
Priority to PCT/KR2010/000753 priority Critical patent/WO2011096607A1/en
Publication of WO2011096607A1 publication Critical patent/WO2011096607A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/44—Yarns or threads characterised by the purpose for which they are designed
    • D02G3/441—Yarns or threads with antistatic, conductive or radiation-shielding properties
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
    • H01Q17/005—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems using woven or wound filaments; impregnated nets or clothes

Definitions

  • the present invention relates to a frequency selective filter through which electromagnetic waves are selectively transmitted and absorbed depending on a frequency band.
  • Electromagnetic wave transmitter and receiver are needed to utilize such electromagnetic waves in information communication fields.
  • the electromagnetic wave receiver may be an antenna or the like, and designed to receive electromagnetic waves in a specific frequency band.
  • the frequency selective filter denotes a filter which selectively reflects or transmits and absorbs electromagnetic waves depending on a frequency band.
  • a frequency selective filter which is produced by weaving core yarns.
  • the core yarn may include a wick, a conductor and a coating unit.
  • the conductor may be disposed to be wound on the wick, and at least part of the conductor may be made of a conductive material.
  • the coating unit may be disposed to wrap up the conductor so as to coat the conductor.
  • At least one of the wick and the coating unit may be made of a natural fiber or a synthetic fiber.
  • the conductor may be formed of a filament of a conductive fiber.
  • the frequency selective filter may be configured such that a frequency band of transmitted and absorbed electromagnetic waves can be selected based upon diameters of the wick and/or the coating unit.
  • the frequency selective filter may have a pattern which is periodically formed by the weaving of the core yarns. The pattern may be in a shape of a polygonal cell.
  • the present invention can implement a frequency selective filter made of fabrics, by use of weaveable core yarns. Also, the frequency selective filter can be made of core yarns having flexibility.
  • a frequency selective filter can be created which can vary frequency bands of transmitted and absorbed electromagnetic waves by changing a shape of a unit cell. Also, the present invention can more improve tactile impression of the frequency selective filter by use of a coating material.
  • FIG. 1 is an overview of a core yarn in accordance with one embodiment of the present invention
  • FIG. 2 is an overview showing one embodiment of a frequency selective filter implemented by weaving the core yarn of FIG. 1;
  • FIGS. 3 and 4 are overviews showing another embodiments of frequency selective filters according to the present invention, which can select a frequency band.
  • FIGS. 5 and 6 are overviews showing another embodiments of frequency selective filters according to the present invention, which can select a frequency band.
  • FIG. 1 is an overview of a core yarn 100 in accordance with one embodiment of the present invention.
  • the core yarn 100 may include a wick 110, a conductor 120 and a coating unit 130.
  • the wick 110 may be disposed to serve as a core of the core yarn 100.
  • the wick 110 may be made of a flexible fiber. Accordingly, even if an external force is applied to the core yarn 100, the core yarn 100 can be expanded and contracted up to a range near an expansion and contraction range of the wick 110.
  • the wick 110 may be made of a natural fiber or a synthetic fiber.
  • examples of the natural fiber may include cotton, wool, linen, silk and the like
  • examples of the synthetic fiber may include nylon, polyester, acryl and the like.
  • the conductor 120 may be formed to be wound on at least part of the wick 110.
  • the conductor 120 may be wound on the wick 110 at a constant interval, as similar to a screw thread formed on a bolt.
  • At least part of the conductor 120 may be formed of a conductive material, so as to shield electromagnetic waves.
  • the phrase ‘shielding electromagnetic waves’ expressed in the specification of the present invention may all cover reflecting or absorbing electromagnetic waves.
  • the conductor 120 may be made of a filament of a conductive fiber.
  • the conductive fiber may include a carbon fiber, for example.
  • the conductor 120 may be formed as a piece of string so as to wrap up the wick 110, which facilitates the expansion and contraction of the core yarn 100.
  • the coating unit 130 may be coated on the conductor 120 to protect the conductor 120.
  • the coating unit 130 may cover the conductor 120 in an opposite direction to the direction that the conductor 120 wraps up the wick 110.
  • the present invention may not be limited to these directions.
  • the coating unit 130 may cover the conduct 120 in the same direction as the direction of the conductor 120 wrapping up the wick 110.
  • the coating unit 130 may cover not only the wick 110 but also the conductor 120, thereby preventing external exposure of the wick 110 and the conductor 120.
  • the coating unit 130 may be made of a natural fiber or a synthetic fiber.
  • examples of the natural fiber may include cotton, wool, linen, silk and the like
  • examples of the synthetic fiber may include nylon, polyester, acryl and the like.
  • the coating unit 130 may be made of the same fiber as the wick 110.
  • the core yarn 100 can have improved intensity and provide good tactile impression upon fabrication of a frequency selective filter 200 (see FIG. 2).
  • FIG. 2 is an overview showing one embodiment of a frequency selective filter 200 produced by weaving the core yarn 100 of FIG. 1.
  • the core yarn 100 of FIG. 1 is used as a yarn of the frequency selective filter 200, thereby implementing a frequency selective filter made of a fabric.
  • the frequency selective filter 200 may be made by weaving the core yarns 100 to intersect with each other.
  • the present invention may not be limited to the structure, but the frequency selective filter may be made by weaving the core yarns 100 with an inclination angle.
  • the frequency selective filter 200 may have a periodic pattern which is made by the weaving of the core yarn 100.
  • the core yarns 100 are made by knitting warp and weft so as to have a periodic pattern which is important to the performance of the frequency selective filter 200.
  • the pattern may in a shape of a polygonal cell.
  • the frequency selective filter 200 may include repetitive unit cells 201.
  • FIGS. 3 and 4 are overviews showing another embodiments of frequency selective filters 300a and 300b according to the present invention, which can select a frequency band.
  • the unit cell 201 may be in the polygonal form which is formed by connecting centerlines of the conductors 120.
  • a unit cell 301a of the frequency selective filter 300a forms a perfect square.
  • a length WU of one line of the unit cell 301a may be represented by the sum of thickness TY and interval WG of the core yarn 100.
  • the thickness TY of the core yarn 100 may be represented by the sum of a diameter d1 of the wick 110, a diameter d2 of the conductor 120 and a diameter d3 of the coating unit 130 (see FIG. 1).
  • the frequency selective filter 300a may be configured such that a frequency band of electromagnetic waves which are transmitted and absorbed can be selected based upon the diameters d1 and d3 of the wick 110 and/or the coating unit 130.
  • a size, density and the like of the unit cell 301a may be varied if the diameters d1 and d3 of the wick and/or the coating unit 130 change with respect to a specific conductor 120.
  • the frequency selective filter 300b may be produced by weaving core yarns 100' which are thicker than the core yarns 100. It may be implemented by increasing a diameter of a wick 110' or a coating unit 130'. The core yarn 100' may be easily obtained merely by changing the diameter of the coating unit 130'. Accordingly, a unit cell 301b can be smaller in size and the density of a conductor can be decreased for each unit area. Consequently, the frequency selective filter 300b may have a frequency band of electromagnetic waves which are transmitted and absorbed, which is varied responsive to the change in the shape of the unit cell 301a, 301b.
  • FIGS. 5 and 6 are overviews showing another embodiments of frequency selective filters 400a and 400b according to the present invention, which can select a frequency band.
  • a unit cell 401a of the frequency selective filter 400a has a triangular form.
  • the triangular unit cell 401a occupies a frequency band of transmitted and absorbed electromagnetic waves, which is different from the frequency band of the square unit cell.
  • a unit cell 402b of the frequency selective filter 400b may have different size, density and the like, responsive to the change in the thickness TY of the core yarn 100'.
  • the core yarn 100' can be easily produced merely by increasing the diameter d3 of the coating unit 130 of the core yarn 100 of FIG. 5.
  • the change in the thickness of the core yarns 100 and 100' allows the production of the frequency selective filters 400a and 400b occupying different frequency bands of electromagnetic waves which are transmitted and absorbed.
  • the frequency selective filter may not be limited to the construction and method illustrated in the foregoing embodiments. Many variations can be embodied by selective combination of all or part of the embodiments.
  • the frequency selective filter may be industrially applicable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Woven Fabrics (AREA)

Abstract

A frequency selective filter produced by weaving a core yarn, wherein the core yarn includes a wick, a conductor disposed to be wound on the wick, at least part of the conductor made of a conductive material, and a coating unit disposed to wrap up the conductor so as to coat the conductor, resulting in implementation of the frequency selective filter which can vary a frequency band of transmitted and absorbed electromagnetic waves by diameters of fibers producing the core yarn.

Description

FREQUENCY SELECTIVE FILTER
The present invention relates to a frequency selective filter through which electromagnetic waves are selectively transmitted and absorbed depending on a frequency band.
As information communication technologies rapidly develop, electromagnetic waves exist in many spaces around us.
Electromagnetic wave transmitter and receiver are needed to utilize such electromagnetic waves in information communication fields. For example, the electromagnetic wave receiver may be an antenna or the like, and designed to receive electromagnetic waves in a specific frequency band.
In order to receive electromagnetic waves in the specific frequency band, a frequency selective filter may be employed. The frequency selective filter denotes a filter which selectively reflects or transmits and absorbs electromagnetic waves depending on a frequency band.
It may be considered to weave the frequency selective filter into a particular shape by use of electromagnetic wave shielding yarn which is capable of reflecting or absorbing electromagnetic waves.
Therefore, it is an object of the present invention to provide a frequency selective filter produced by way of weaving.
It is another object of the present invention to provide a frequency selective filter capable of facilitating designs of frequency bands to be selected.
To achieve the objects of the present invention, there is provided a frequency selective filter which is produced by weaving core yarns. The core yarn may include a wick, a conductor and a coating unit. The conductor may be disposed to be wound on the wick, and at least part of the conductor may be made of a conductive material. The coating unit may be disposed to wrap up the conductor so as to coat the conductor.
In one aspect of the present invention, at least one of the wick and the coating unit may be made of a natural fiber or a synthetic fiber. The conductor may be formed of a filament of a conductive fiber.
In another aspect of the present invention, the frequency selective filter may be configured such that a frequency band of transmitted and absorbed electromagnetic waves can be selected based upon diameters of the wick and/or the coating unit. The frequency selective filter may have a pattern which is periodically formed by the weaving of the core yarns. The pattern may be in a shape of a polygonal cell.
The present invention can implement a frequency selective filter made of fabrics, by use of weaveable core yarns. Also, the frequency selective filter can be made of core yarns having flexibility.
In addition, according to the present invention, a frequency selective filter can be created which can vary frequency bands of transmitted and absorbed electromagnetic waves by changing a shape of a unit cell. Also, the present invention can more improve tactile impression of the frequency selective filter by use of a coating material.
FIG. 1 is an overview of a core yarn in accordance with one embodiment of the present invention;
FIG. 2 is an overview showing one embodiment of a frequency selective filter implemented by weaving the core yarn of FIG. 1;
FIGS. 3 and 4 are overviews showing another embodiments of frequency selective filters according to the present invention, which can select a frequency band; and
FIGS. 5 and 6 are overviews showing another embodiments of frequency selective filters according to the present invention, which can select a frequency band.
Description will now be given in detail of a frequency selective filter according to the present invention, with reference to the accompanying drawings. This specification employs like/similar reference numerals for like/similar components irrespective of different embodiments, so they all will be understood by the first description. The expression in the singular form in this specification will cover the expression in the plural form unless otherwise indicated obviously from the context.
FIG. 1 is an overview of a core yarn 100 in accordance with one embodiment of the present invention.
As shown in FIG. 1, the core yarn 100 may include a wick 110, a conductor 120 and a coating unit 130.
The wick 110 may be disposed to serve as a core of the core yarn 100. The wick 110 may be made of a flexible fiber. Accordingly, even if an external force is applied to the core yarn 100, the core yarn 100 can be expanded and contracted up to a range near an expansion and contraction range of the wick 110.
The wick 110 may be made of a natural fiber or a synthetic fiber. For example, examples of the natural fiber may include cotton, wool, linen, silk and the like, and examples of the synthetic fiber may include nylon, polyester, acryl and the like.
The conductor 120 may be formed to be wound on at least part of the wick 110.
As shown in the drawing, the conductor 120 may be wound on the wick 110 at a constant interval, as similar to a screw thread formed on a bolt.
At least part of the conductor 120 may be formed of a conductive material, so as to shield electromagnetic waves. The phrase ‘shielding electromagnetic waves’ expressed in the specification of the present invention may all cover reflecting or absorbing electromagnetic waves.
The conductor 120 may be made of a filament of a conductive fiber. The conductive fiber may include a carbon fiber, for example.
The conductor 120 may be formed as a piece of string so as to wrap up the wick 110, which facilitates the expansion and contraction of the core yarn 100.
The coating unit 130 may be coated on the conductor 120 to protect the conductor 120.
Referring to the drawing, the coating unit 130 may cover the conductor 120 in an opposite direction to the direction that the conductor 120 wraps up the wick 110. Here, the present invention may not be limited to these directions. For example, the coating unit 130 may cover the conduct 120 in the same direction as the direction of the conductor 120 wrapping up the wick 110.
The coating unit 130 may cover not only the wick 110 but also the conductor 120, thereby preventing external exposure of the wick 110 and the conductor 120.
The coating unit 130 may be made of a natural fiber or a synthetic fiber. For example, examples of the natural fiber may include cotton, wool, linen, silk and the like, and examples of the synthetic fiber may include nylon, polyester, acryl and the like. The coating unit 130 may be made of the same fiber as the wick 110.
By virtue of the coating unit 130 covering the conductor 120, the core yarn 100 can have improved intensity and provide good tactile impression upon fabrication of a frequency selective filter 200 (see FIG. 2).
FIG. 2 is an overview showing one embodiment of a frequency selective filter 200 produced by weaving the core yarn 100 of FIG. 1.
As shown in FIG. 2, the core yarn 100 of FIG. 1 is used as a yarn of the frequency selective filter 200, thereby implementing a frequency selective filter made of a fabric.
The frequency selective filter 200 may be made by weaving the core yarns 100 to intersect with each other. Here, the present invention may not be limited to the structure, but the frequency selective filter may be made by weaving the core yarns 100 with an inclination angle.
The frequency selective filter 200 may have a periodic pattern which is made by the weaving of the core yarn 100. The core yarns 100 are made by knitting warp and weft so as to have a periodic pattern which is important to the performance of the frequency selective filter 200. The pattern may in a shape of a polygonal cell. Thus, the frequency selective filter 200 may include repetitive unit cells 201.
FIGS. 3 and 4 are overviews showing another embodiments of frequency selective filters 300a and 300b according to the present invention, which can select a frequency band.
The unit cell 201 may be in the polygonal form which is formed by connecting centerlines of the conductors 120. Referring to FIG. 3, a unit cell 301a of the frequency selective filter 300a forms a perfect square. A length WU of one line of the unit cell 301a may be represented by the sum of thickness TY and interval WG of the core yarn 100. The thickness TY of the core yarn 100 may be represented by the sum of a diameter d1 of the wick 110, a diameter d2 of the conductor 120 and a diameter d3 of the coating unit 130 (see FIG. 1).
The frequency selective filter 300a may be configured such that a frequency band of electromagnetic waves which are transmitted and absorbed can be selected based upon the diameters d1 and d3 of the wick 110 and/or the coating unit 130. In the structure of the frequency selective filter 300a, a size, density and the like of the unit cell 301a may be varied if the diameters d1 and d3 of the wick and/or the coating unit 130 change with respect to a specific conductor 120.
Referring to FIG. 4, the frequency selective filter 300b may be produced by weaving core yarns 100' which are thicker than the core yarns 100. It may be implemented by increasing a diameter of a wick 110' or a coating unit 130'. The core yarn 100' may be easily obtained merely by changing the diameter of the coating unit 130'. Accordingly, a unit cell 301b can be smaller in size and the density of a conductor can be decreased for each unit area. Consequently, the frequency selective filter 300b may have a frequency band of electromagnetic waves which are transmitted and absorbed, which is varied responsive to the change in the shape of the unit cell 301a, 301b.
FIGS. 5 and 6 are overviews showing another embodiments of frequency selective filters 400a and 400b according to the present invention, which can select a frequency band.
Referring to FIG. 5, a unit cell 401a of the frequency selective filter 400a has a triangular form. The triangular unit cell 401a occupies a frequency band of transmitted and absorbed electromagnetic waves, which is different from the frequency band of the square unit cell. As such, it is possible to fabricate the frequency selective filters 300a and 400a (see FIG. 3) occupying different frequency bands of transmitted and absorbed electromagnetic waves by weaving the core yarns 100 into the different shapes.
Referring to FIG. 6, a unit cell 402b of the frequency selective filter 400b may have different size, density and the like, responsive to the change in the thickness TY of the core yarn 100'.
The core yarn 100' can be easily produced merely by increasing the diameter d3 of the coating unit 130 of the core yarn 100 of FIG. 5.
Therefore, the change in the thickness of the core yarns 100 and 100' allows the production of the frequency selective filters 400a and 400b occupying different frequency bands of electromagnetic waves which are transmitted and absorbed.
The frequency selective filter may not be limited to the construction and method illustrated in the foregoing embodiments. Many variations can be embodied by selective combination of all or part of the embodiments.
The frequency selective filter may be industrially applicable.

Claims (6)

  1. A frequency selective filter produced by weaving a core yarn,
    wherein the core yarn comprises:
    a wick;
    a conductor disposed to be wound on the wick, at least part of the conductor made of a conductive material; and
    a coating unit disposed to wrap up the conductor so as to coat the conductor.
  2. The filter of claim 1, wherein at least one of the wick and the coating unit is made of a natural fiber or a synthetic fiber.
  3. The filter of claim 1, wherein the conductor is formed of a filament of a conductive fiber.
  4. The filter of claim 1, wherein a frequency band of electromagnetic waves, which are transmitted and absorbed, is selected by a diameter of the wick and/or the coating unit.
  5. The filter of claim 1, wherein a periodic pattern is formed by the weaving of the core yarn.
  6. The filter of claim 5, wherein the pattern is in a shape of a polygonal cell.
PCT/KR2010/000753 2010-02-08 2010-02-08 Frequency selective filter Ceased WO2011096607A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/KR2010/000753 WO2011096607A1 (en) 2010-02-08 2010-02-08 Frequency selective filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2010/000753 WO2011096607A1 (en) 2010-02-08 2010-02-08 Frequency selective filter

Publications (1)

Publication Number Publication Date
WO2011096607A1 true WO2011096607A1 (en) 2011-08-11

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PCT/KR2010/000753 Ceased WO2011096607A1 (en) 2010-02-08 2010-02-08 Frequency selective filter

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108140135A (en) * 2015-10-09 2018-06-08 贝卡尔特公司 For the antenna used in an rfid tag

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0448714A1 (en) * 1989-10-18 1991-10-02 Toray Industries, Inc. Process for producing a fabric having overlapping strips
EP0759573A2 (en) * 1995-08-17 1997-02-26 Eastman Kodak Company Wavelength-selective phase-type optical low-antialiasing filter and fabrication methods
KR20000049282A (en) * 1996-10-18 2000-07-25 메리 이. 보울러 Rapid fabric forming
KR20050008707A (en) * 2002-05-10 2005-01-21 사르노프 코포레이션 Woven electronic textile, yarn and article

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0448714A1 (en) * 1989-10-18 1991-10-02 Toray Industries, Inc. Process for producing a fabric having overlapping strips
EP0759573A2 (en) * 1995-08-17 1997-02-26 Eastman Kodak Company Wavelength-selective phase-type optical low-antialiasing filter and fabrication methods
KR20000049282A (en) * 1996-10-18 2000-07-25 메리 이. 보울러 Rapid fabric forming
KR20050008707A (en) * 2002-05-10 2005-01-21 사르노프 코포레이션 Woven electronic textile, yarn and article

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108140135A (en) * 2015-10-09 2018-06-08 贝卡尔特公司 For the antenna used in an rfid tag

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