GB933007A - Electro-magnetic wave absorbers - Google Patents
Electro-magnetic wave absorbersInfo
- Publication number
- GB933007A GB933007A GB1803461A GB1803461A GB933007A GB 933007 A GB933007 A GB 933007A GB 1803461 A GB1803461 A GB 1803461A GB 1803461 A GB1803461 A GB 1803461A GB 933007 A GB933007 A GB 933007A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wall
- steps
- permeability
- propagation
- dielectric
- 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
Links
- 239000006096 absorbing agent Substances 0.000 title abstract 3
- 239000000463 material Substances 0.000 abstract 8
- 230000035699 permeability Effects 0.000 abstract 4
- 230000002745 absorbent Effects 0.000 abstract 3
- 239000002250 absorbent Substances 0.000 abstract 3
- 239000003989 dielectric material Substances 0.000 abstract 3
- 238000010521 absorption reaction Methods 0.000 abstract 2
- 239000004793 Polystyrene Substances 0.000 abstract 1
- 229920001971 elastomer Polymers 0.000 abstract 1
- 239000000945 filler Substances 0.000 abstract 1
- 229920002223 polystyrene Polymers 0.000 abstract 1
- 229920002635 polyurethane Polymers 0.000 abstract 1
- 239000004814 polyurethane Substances 0.000 abstract 1
- 239000005060 rubber Substances 0.000 abstract 1
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
- H01Q17/008—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems with a particular shape
Landscapes
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
933,007. Radio wave absorbers. SIEMENS & HALSKE A.G. May 17, 1961 [May 17, 1960], No. 18034/61. Class 40 (7). A device for absorbing radiated electromagnetic energy includes a lattice formed of resistive material extending in the direction of propagation of the incident energy with its interstices filled with a material whose dielectric constant # is greater than unity and increases in the direction of propagation in steps or continuously, e.g. exponentially. Preferably the permeability Á of the dielectric material is greater than that of air and is constant throughout the material but alternatively the permeability may increase continuously or in steps in the direction of propagation. In the latter case the ratio #Á/# may decrease in the direction of propagation but it is preferred to maintain said ratio constant at a value equal to #Á 0 /# 0 where Á 0 and # 0 are the permeability and dielectric constant of a vacuum. A lattice of absorbent material may be formed by providing such material on the surfaces 6a, 7a, 8a, normal to a wall 5 of blocks 6, 7, 8, of dielectric material which form successive layers in front of the wall. The surface of the area parallel to the wall of each block in a layer may be a fraction, e.g. a quarter, of the similar surface of a block in an adjacent layer farther from the wall so that the amount of absorbent material increases in steps in the path of incident energy. The resistance of the absorbent material may decrease in steps as the wall is approached and the dielectric material may be of foamed material, e.g. rubber, polystyrene or polyurethane, containing fillers so that the dielectric constant e and possibly the permeability Á increases in either discrete steps or continuously (e.g. exponentially) as the wall is approached. The increasing values of e and Á are stated to result in a shorter depth of the absorption path than in known " honeycomb " absorbers and the depth of the absorption path may be further shortened by placing a network of conductive fibres or wires on the surface of the wall.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES0068545 | 1960-05-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB933007A true GB933007A (en) | 1963-07-31 |
Family
ID=7500363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1803461A Expired GB933007A (en) | 1960-05-17 | 1961-05-17 | Electro-magnetic wave absorbers |
Country Status (6)
| Country | Link |
|---|---|
| BE (1) | BE603843A (en) |
| CH (1) | CH402977A (en) |
| DK (1) | DK106501C (en) |
| GB (1) | GB933007A (en) |
| LU (1) | LU39910A1 (en) |
| NL (1) | NL263975A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2192756A (en) * | 1986-07-07 | 1988-01-20 | Hoybond Limited | Energy absorbing coatings and their use in camouflage |
-
0
- NL NL263975D patent/NL263975A/xx unknown
-
1961
- 1961-03-20 LU LU39910D patent/LU39910A1/xx unknown
- 1961-04-25 CH CH481461A patent/CH402977A/en unknown
- 1961-05-12 DK DK6162A patent/DK106501C/en active
- 1961-05-16 BE BE603843A patent/BE603843A/en unknown
- 1961-05-17 GB GB1803461A patent/GB933007A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2192756A (en) * | 1986-07-07 | 1988-01-20 | Hoybond Limited | Energy absorbing coatings and their use in camouflage |
Also Published As
| Publication number | Publication date |
|---|---|
| LU39910A1 (en) | 1961-05-20 |
| NL263975A (en) | |
| BE603843A (en) | 1961-11-18 |
| DK106501C (en) | 1967-02-13 |
| CH402977A (en) | 1965-11-30 |
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