GB893007A - Improvements in compositions for absorbing radio waves and methods of manufacturing such compositions - Google Patents

Improvements in compositions for absorbing radio waves and methods of manufacturing such compositions

Info

Publication number
GB893007A
GB893007A GB120150A GB120150A GB893007A GB 893007 A GB893007 A GB 893007A GB 120150 A GB120150 A GB 120150A GB 120150 A GB120150 A GB 120150A GB 893007 A GB893007 A GB 893007A
Authority
GB
United Kingdom
Prior art keywords
compositions
particles
radio waves
jan
manufacturing
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
GB120150A
Inventor
Geoffrey Charlesgaut
Harold Vivian George Stubbs
Donald Swaddle
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.)
Plessey Co Ltd
Original Assignee
Plessey Co Ltd
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 Plessey Co Ltd filed Critical Plessey Co Ltd
Priority to GB120150A priority Critical patent/GB893007A/en
Publication of GB893007A publication Critical patent/GB893007A/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
    • H01Q17/004—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems using non-directional dissipative particles, e.g. ferrite powders

Landscapes

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

Abstract

893,007. Magnetic compositions. PLESSEY CO. Ltd. Jan. 16, 1951 [Jan. 17, 1950], No. 1201/50. Class 38 (2). [Also in Group XL (c)] Material for rendering buildings non-reflective to radio waves in the centimetre band consists of a sheet of a binding agent in which are distributed particles of one or more electrically conducting and/or ferromagnetic material, the sheet thickness being a quarter of a specified wavelength. The concentration of the particles, and thus also the wave attenuation, is controlled so that the loss approximates to a critical value, when where K is the absorption index = #Á.# # is the dielectric constant Á is the complex magnetic permeability # is the dielectric loss angle. Continuous monitoring of the reflecting properties of the film over the required frequency range may be effected, during production, by directing the output of an F.M. microwave generator on to the film surface by a flared horn and observing the reflected signal. The particles used may be, aluminium flakes, carbon black, a ferrite, carbonyl-iron or nickeliron. The binding material may be natural rubber, synthetic rubber, or cellulose acetobutyrat lacquer.
GB120150A 1950-01-17 1950-01-17 Improvements in compositions for absorbing radio waves and methods of manufacturing such compositions Expired GB893007A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB120150A GB893007A (en) 1950-01-17 1950-01-17 Improvements in compositions for absorbing radio waves and methods of manufacturing such compositions

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB120150A GB893007A (en) 1950-01-17 1950-01-17 Improvements in compositions for absorbing radio waves and methods of manufacturing such compositions

Publications (1)

Publication Number Publication Date
GB893007A true GB893007A (en) 1962-04-04

Family

ID=9717912

Family Applications (1)

Application Number Title Priority Date Filing Date
GB120150A Expired GB893007A (en) 1950-01-17 1950-01-17 Improvements in compositions for absorbing radio waves and methods of manufacturing such compositions

Country Status (1)

Country Link
GB (1) GB893007A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2181898A (en) * 1985-10-21 1987-04-29 Plessey Co Plc Electro-magnetic wave absorbers
GB2196343A (en) * 1983-10-03 1988-04-27 Courtaulds Plc Microwave-absorbing fibres and filaments
EP0328119A2 (en) * 1988-02-10 1989-08-16 BASF Corporation Stabilized polyacrylonitrile fibers and method of preparation
DE3900857A1 (en) * 1989-01-13 1990-07-26 Messerschmitt Boelkow Blohm FACADE BUILDING OF BUILDINGS IN THERMAL INSULATION TRAINING AND METHOD FOR PRODUCING THERMAL INSULATION
DE3900856A1 (en) * 1989-01-13 1990-07-26 Messerschmitt Boelkow Blohm FACADE CONSTRUCTION OF BUILDINGS
EP0479438A2 (en) * 1990-10-02 1992-04-08 Minnesota Mining And Manufacturing Company Electromagnetic radiation absorbing material employing doubly layered particles
EP0864673A2 (en) * 1997-03-14 1998-09-16 Ten Co. Ltd. Wave absorbing fiber

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2196343A (en) * 1983-10-03 1988-04-27 Courtaulds Plc Microwave-absorbing fibres and filaments
GB2181898B (en) * 1985-10-21 1990-01-17 Plessey Co Plc Electro-magnetic wave absorber surface
GB2181898A (en) * 1985-10-21 1987-04-29 Plessey Co Plc Electro-magnetic wave absorbers
EP0328119A3 (en) * 1988-02-10 1991-03-20 BASF Corporation Stabilized polyacrylonitrile fibers and method of preparation
EP0328119A2 (en) * 1988-02-10 1989-08-16 BASF Corporation Stabilized polyacrylonitrile fibers and method of preparation
DE3900857A1 (en) * 1989-01-13 1990-07-26 Messerschmitt Boelkow Blohm FACADE BUILDING OF BUILDINGS IN THERMAL INSULATION TRAINING AND METHOD FOR PRODUCING THERMAL INSULATION
DE3900856A1 (en) * 1989-01-13 1990-07-26 Messerschmitt Boelkow Blohm FACADE CONSTRUCTION OF BUILDINGS
US5083127A (en) * 1989-01-13 1992-01-21 Messerschmitt-Bolkow-Blohm Gmbh Thermal barrier facade construction of high rise structures and a process for fabrication of a thermal barrier
US5084705A (en) * 1989-01-13 1992-01-28 Messerschmitt Bolkow-Blohm Gmbh Facade construction in high rise structures
EP0479438A2 (en) * 1990-10-02 1992-04-08 Minnesota Mining And Manufacturing Company Electromagnetic radiation absorbing material employing doubly layered particles
EP0479438B1 (en) * 1990-10-02 1997-04-02 Minnesota Mining And Manufacturing Company Electromagnetic radiation absorbing material employing doubly layered particles
EP0864673A2 (en) * 1997-03-14 1998-09-16 Ten Co. Ltd. Wave absorbing fiber
EP0864673A3 (en) * 1997-03-14 1999-11-10 Ten Co. Ltd. Wave absorbing fiber

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