GB1170420A - Improvements in or relating to a Spatial Absorber for Electromagnetic Waves - Google Patents

Improvements in or relating to a Spatial Absorber for Electromagnetic Waves

Info

Publication number
GB1170420A
GB1170420A GB5845366A GB5845366A GB1170420A GB 1170420 A GB1170420 A GB 1170420A GB 5845366 A GB5845366 A GB 5845366A GB 5845366 A GB5845366 A GB 5845366A GB 1170420 A GB1170420 A GB 1170420A
Authority
GB
United Kingdom
Prior art keywords
absorber
wall elements
elements
propagation
absorbed
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.)
Expired
Application number
GB5845366A
Inventor
Hans-Ludwig Wesch
Hartmut Fromme
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.)
Eltro GmbH and Co
Original Assignee
Eltro GmbH and Co
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 Eltro GmbH and Co filed Critical Eltro GmbH and Co
Priority to GB5845366A priority Critical patent/GB1170420A/en
Publication of GB1170420A publication Critical patent/GB1170420A/en
Expired 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

Landscapes

  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

1,170,420. Aerials. ELTRO G.m.b.H. & CO., GES. FUR STRAHLUNGSTECHNIK. 30 Dec., 1966, No. 58453/66. Heading H4A. An electromagnetic wave absorber comprises a plurality of wall elements arranged parallel to the direction of propagation of the wave, and consisting of resin impregnated glass fibre material. The external surfaces of the elements have conductive coatings, the surface resistance of which decreases in the said direction of propagation. The wall elements are disposed adjacent to each other at spacings of less than one-fifth of the longest wavelength to be absorbed. All spaces within or between the elements are filled with a foamed material, such as polyurethane. The wall elements may be flat or tubular (e.g. of circular or hexagonal cross-sections) and the glass fibres may be made up as fabric or matting before application, or they may be wound directly on formers to produce tubes. An absorber may have a dielectric outer covering of thickness less than one-eighth of the minimum wavelength to be absorbed, and including a plurality cf layers of different dielectric constants, to match the impedance of the absorber to that of free space. The conductive coatings of the wall elements may comprise graphite, or carbon black, or a ferrite, or a semi-conductor.
GB5845366A 1966-12-30 1966-12-30 Improvements in or relating to a Spatial Absorber for Electromagnetic Waves Expired GB1170420A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5845366A GB1170420A (en) 1966-12-30 1966-12-30 Improvements in or relating to a Spatial Absorber for Electromagnetic Waves

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5845366A GB1170420A (en) 1966-12-30 1966-12-30 Improvements in or relating to a Spatial Absorber for Electromagnetic Waves

Publications (1)

Publication Number Publication Date
GB1170420A true GB1170420A (en) 1969-11-12

Family

ID=10481656

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5845366A Expired GB1170420A (en) 1966-12-30 1966-12-30 Improvements in or relating to a Spatial Absorber for Electromagnetic Waves

Country Status (1)

Country Link
GB (1) GB1170420A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2158995A (en) * 1984-02-18 1985-11-20 Pa Consulting Services Improvements in and relating to the absorption of electromagnetic radiation
EP0369174A1 (en) * 1988-11-15 1990-05-23 G + H Montage Gmbh Broad-band absorber for electromagnetic waves
EP0439337A2 (en) * 1990-01-25 1991-07-31 Yoshiyuki Naito Broad-band wave absorber
EP0651697A1 (en) * 1992-05-29 1995-05-10 Northrop Grumman Corporation Method for making a material with artificial dielectric constant
GB2324656A (en) * 1997-03-27 1998-10-28 Ams Polymers Radiation absorbing member

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2158995A (en) * 1984-02-18 1985-11-20 Pa Consulting Services Improvements in and relating to the absorption of electromagnetic radiation
EP0369174A1 (en) * 1988-11-15 1990-05-23 G + H Montage Gmbh Broad-band absorber for electromagnetic waves
EP0439337A2 (en) * 1990-01-25 1991-07-31 Yoshiyuki Naito Broad-band wave absorber
EP0439337A3 (en) * 1990-01-25 1991-11-06 Yoshiyuki Naito Broad-band wave absorber
EP0651697A1 (en) * 1992-05-29 1995-05-10 Northrop Grumman Corporation Method for making a material with artificial dielectric constant
EP0651697A4 (en) * 1992-05-29 1995-12-06 Hexcel Corp Method for making a material with artificial dielectric constant.
GB2324656A (en) * 1997-03-27 1998-10-28 Ams Polymers Radiation absorbing member

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