EP0068092A2 - Absorbants de micro-ondes produisant une très faible réflexion ainsi que leur utilisation - Google Patents

Absorbants de micro-ondes produisant une très faible réflexion ainsi que leur utilisation Download PDF

Info

Publication number
EP0068092A2
EP0068092A2 EP19820103260 EP82103260A EP0068092A2 EP 0068092 A2 EP0068092 A2 EP 0068092A2 EP 19820103260 EP19820103260 EP 19820103260 EP 82103260 A EP82103260 A EP 82103260A EP 0068092 A2 EP0068092 A2 EP 0068092A2
Authority
EP
European Patent Office
Prior art keywords
pile
metallized textile
goods according
nickel
reflection
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.)
Withdrawn
Application number
EP19820103260
Other languages
German (de)
English (en)
Inventor
Harold Dr. Ebneth
Hans Georg Fitzky
Gerhard Dieter Dr. Wolf
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.)
Bayer AG
Original Assignee
Bayer AG
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
Priority claimed from DE19813117246 external-priority patent/DE3117246A1/de
Priority claimed from DE19813117245 external-priority patent/DE3117245A1/de
Application filed by Bayer AG filed Critical Bayer AG
Publication of EP0068092A2 publication Critical patent/EP0068092A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
    • D06M11/83—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with metals; with metal-generating compounds, e.g. metal carbonyls; Reduction of metal compounds on textiles
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06Q—DECORATING TEXTILES
    • D06Q1/00—Decorating textiles
    • D06Q1/04—Decorating textiles by metallising

Definitions

  • Metallized textile fabrics show the property, depending on the textile construction, even with very small metal layers, e.g. wet-chemical according to DE-AS 2 743 768 ( ⁇ US Pat. No. 4,201,825) are applied to the surface, a high shielding attenuation combined with a high reflection, i.e. with very little loss of reflection.
  • very small metal layers e.g. wet-chemical according to DE-AS 2 743 768 ( ⁇ US Pat. No. 4,201,825) are applied to the surface, a high shielding attenuation combined with a high reflection, i.e. with very little loss of reflection.
  • nickel-plated filament yarn fabrics stand out compared to nickel-plated fiber yarn fabrics with the same metal thickness, metal quality and amount per unit area in terms of their very low reflection loss, coupled with high shielding attenuation.
  • the table clearly shows an extremely high reflection, which e.g. for items to be tracked, e.g. Life jackets, lifeboat islands, is very important.
  • metallized textile pile goods with metal layer thicknesses of 0.02 to 2 ⁇ m have, in addition to a high shielding attenuation, a reduced reflection of microwaves.
  • the subject of the invention is therefore metallized textile pile goods with metal layer thicknesses of 0.02 to 2 pm.
  • Pole goods are to be understood in particular as textile goods in which individual fibers protrude from the fabric surface, in particular are arranged vertically.
  • the distance between the pile fibers is at most 10%, preferably 1 to 5% of the pile height.
  • Suitable polar goods are e.g. roughened fabrics, plush, velor, velvet, electrostatic flocked fabrics, needle felts, papers and nonwovens.
  • metals that can be applied to the pile goods according to DE-OS 2 743 768 e.g. Copper, nickel, cobalt, iron and gold individually or in combination (e.g. Co / Ni, Ni / Fe or Ni / Fe / Co) in question. Cobalt and especially nickel are preferred.
  • the layer thickness is determined as the average layer thickness from the fiber surface, the weight of the goods before and after the metallization and the specific density of the metal. It is generally true that with a smaller pile height a thinner metal layer and with a larger pile height a thicker metal layer around the single filament gives the desired success.
  • the effect is intensified, especially in the case of longer waves, if the base fabric of the pile fabric is coated with a conductive polymer which additionally contains fillers which are lossy in terms of dielectric and / or magnetism.
  • fillers such as titanium dioxide, titanates or magnetic ferrites, can also be incorporated as pigments in the fibers of the pile material.
  • Certain types of conductive carbon black or graphite are particularly suitable as electrically conductive fillers, and magnetic ferrites, in particular Ni, Mn, Zn and Ba ferrites, are suitable as materials with magnetic loss.
  • the electrical conductivity of the polymers used to impregnate the base fabric is preferably in the range from 10 -3 to 10 ° (Ohm.cm) -1 .
  • the pole material according to the invention fulfills the two sub-tasks of low-reflection absorption and high shielding attenuation.
  • the low-reflection off; Sorption is mainly achieved by the properties of the pole, the shielding attenuation essentially by the base fabric, preferably in connection with an impregnation with a conductive polymer.
  • Metallizations in the range from 0.05 to approximately 0.15 ⁇ m for the pile fibers and from approximately 0.2 to 0.4 ⁇ m for the base fabric are optimal for use as far field absorbers, preferably for the frequency range from 1 to over 100 GHz.
  • the height of the pole essentially influences the position of the lower cut-off frequency for low-reflection absorption. Large pole heights give good absorption at low frequencies.
  • the pole height should not be less than 5 to 10% of the wavelength.
  • the pile height can be further reduced to about 1% of the wavelength with the same absorption quality (reflection loss) if the inductive component of the pile fibers and their anchoring in the base fabric, knitted fabric, knitted fabric or fleece is particularly pronounced, e.g. with so-called warp knit velours.
  • the electrical mode of operation of the individual pile fibers can then be equated to a strongly damped A / 4 dipole with inductive shortening of the dipole length.
  • Effective lossy mechanisms are the high-resistance metallization of the pile fiber and the ohmic losses in the metallized base fabric, knitted fabric, etc., and the dielectric losses in the conductive impregnation.
  • Weatherproof equipment can also be produced by embedding the pile fibers in a closed-cell foam to prevent penetration of e.g. Avoid rainwater that can reduce reflection loss.
  • a closed-cell foam When the pile fabric is embedded in the foam, bending of the pile fibers is avoided as far as possible under mechanical stress. When the pressure is released, the pile fibers straighten up again in the original direction.
  • the screen should attenuation must also be at least 20 db so that the sub-component reflected by the metal surface behind it remains negligible.
  • a roughened fabric made of textile staple fibers was nickel-plated in accordance with DE-OS 2 743 768 with approximately 7.4 g Ni / m 2 .
  • the percentage nickel content was 5% Ni.
  • the nickel-coated fabric was once positioned with the roughened side facing the microwave transmitter at 90 °. The following reflection losses were measured:
  • a velvet fabric made of short-pile cotton (pile height approx. 3 mm) was nickel-plated.
  • the amount of nickel was 50 g / m 2 .
  • the velvet nickel-plated in this way was positioned at 90 ° to the microwave transmitter. The following reflection losses were measured in db:
  • the smooth back of the nickel-plated velvet fabric showed the following values:
  • a shaggy material with a pole height of approx. 20 mm was nickel-plated.
  • the base and pile threads of the shag material used consisted of poly (1,4-bis-hydroxymethylcyclohexane) terephthalate with a titer of 6.7 dtex.
  • the amount of nickel was 168 g / m 2 .
  • the nickel layer in the area of the pole was limited to approximately half the layer thickness of the nickel in the base fabric (approx. 0.2 pm).
  • the reflection losses when irradiating on the pole side were:
  • the shielding attenuation was in the range between 1 and 70 GHz between 9 and 50 db.
  • a woven fur material consisting of a cotton base fabric and polyacrylonitrile base threads with a titer of 7 dtex was nickel-plated according to the method described in the following paragraph.
  • the amount of nickel deposited was 80 g / m 2 .
  • the shielding attenuation was over 10 db in the entire frequency range.
  • the woven fur material is sprayed evenly with a solution of 0.1 g butadiene palladium dichloride per 1 chloroform (blowing agent Frigen).
  • a polyester warp knit velor with a pile height of approximately 1 mm was nickel-plated using the process described in DE-OS 27 43 768. The secluded The amount of nickel was 21 g / m 2 .
  • the velor with a weight per unit area of 273 g / m 2 consists of polyester filament yarn (167 dtex) with 34 individual filaments (4.9 dtex).
  • the thread of the pile threads consists of polyester staple fibers poly (1,4-bis-hydroxymethylcyclohexane) terephthalate, 250 dtex, matt, Nm 40/1, single thread titer 3.3 dtex).
  • the shielding attenuation was between 7 and 14 db. After impregnation of the base fabric with a conductive polymer (polyurethane with 15% conductive carbon black added), the shielding attenuation could be increased to over 16 db.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
EP19820103260 1981-04-30 1982-04-19 Absorbants de micro-ondes produisant une très faible réflexion ainsi que leur utilisation Withdrawn EP0068092A2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3117245 1981-04-30
DE19813117246 DE3117246A1 (de) 1981-04-30 1981-04-30 Mikrowellenabsorber mit sehr geringer reflexion
DE19813117245 DE3117245A1 (de) 1981-04-30 1981-04-30 Verwendung textiler metallisierter polwaren als mikrowellenabsorber
DE3117246 1981-04-30

Publications (1)

Publication Number Publication Date
EP0068092A2 true EP0068092A2 (fr) 1983-01-05

Family

ID=25792975

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820103260 Withdrawn EP0068092A2 (fr) 1981-04-30 1982-04-19 Absorbants de micro-ondes produisant une très faible réflexion ainsi que leur utilisation

Country Status (1)

Country Link
EP (1) EP0068092A2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0124917A1 (fr) * 1983-03-14 1984-11-14 Willi Gottlieb Matériel de camouflage utilisé comme protection contre l'observation avec radar
EP0864673A3 (fr) * 1997-03-14 1999-11-10 Ten Co. Ltd. Fibre absorbant d'ondes
FR2792467A1 (fr) * 1999-04-19 2000-10-20 Thyssen Ascenseurs Armoire electrique des circuits de commande d'un ascenseur
CN113668260A (zh) * 2021-08-30 2021-11-19 南通大学 一种多功能隐身柔性材料及其制备方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0124917A1 (fr) * 1983-03-14 1984-11-14 Willi Gottlieb Matériel de camouflage utilisé comme protection contre l'observation avec radar
EP0864673A3 (fr) * 1997-03-14 1999-11-10 Ten Co. Ltd. Fibre absorbant d'ondes
FR2792467A1 (fr) * 1999-04-19 2000-10-20 Thyssen Ascenseurs Armoire electrique des circuits de commande d'un ascenseur
CN113668260A (zh) * 2021-08-30 2021-11-19 南通大学 一种多功能隐身柔性材料及其制备方法

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19820419

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Designated state(s): DE FR GB

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18W Application withdrawn

Withdrawal date: 19840629

RIN1 Information on inventor provided before grant (corrected)

Inventor name: FITZKY, HANS GEORG

Inventor name: EBNETH, HAROLD, DR.

Inventor name: WOLF, GERHARD DIETER, DR.