DE102005049509B4 - Radiation Radiation Radiation Filter - Google Patents

Abstract

Radiation filter for damping radar radiation,
which comprises an elastomeric layer plate (1) which consists of a plurality of elastomer layers (5, 9, 11)
Chloroprene rubber,
Nitrile-butadiene rubber,
Chloro-butyl rubber,
Butyl rubber or
Carbon nanotubes or fibers,
characterized,
the outer layer (5) of the elastomeric layer plate (1) is formed as a catcher layer (15) and consists of chlorobutyl rubber,
and that at least two different elastomer layers (9, 11) under the outer layer (5) are arranged as a damping layer (13).

Description

The The invention relates to a radiation filter for damping of Radar radiation.

From the DE 689 24 581 T2 For example, a radio-wave-absorbing material is known which is able to absorb and attenuate broadband electromagnetic radiation. This material contains various rubbers such. Butadiene rubber, isobutylene rubber and polyether rubber. Besides these rubbers, various kinds of elastomers are also used in this radio wave absorbing material, e.g. For example, nitrile rubber or chloroprene rubber.

From the DE 103 93 019 T5 For example, there is known an electromagnetic shielding sheet containing a rubber adhesive in the form of chloroprene rubbers, nitrile-butadiene rubbers and butyl rubbers.

radar radiation to detect vehicles and inpatient facilities should be reduced that these are not or only at very short distance on the radar screen can be mapped.

task The invention is to propose a radiation filter, the both a basic attenuation over the entire width of the frequency range as well as an absorption peak achieved in a narrow section of the frequency range.

These The object is achieved by a radiation filter according to claim 1. advantageous Further developments can be found in the dependent claims.

With the invention is in the frequency ranges
8.2-12.4 GHz,
26.5-40 GHz and
90-100 GHz
achieved a basic attenuation> 10 dB.

absorption peaks of> 20 dB at the frequencies 10, 35 and 94 GHz.

In order to is about a halving of Enlightenment depth by enemy Radar reached.

embodiments The invention will be described with reference to the drawing. It shows:

1 a layer structure and

2 a diffusion surface.

A layer structure 1 lies on an outer wall 3 of a vehicle.

A substructure 7 consists of two different elastomer layers 9 . 11 , These together form a damping layer 13 ,

The fat 17 . 19 the elastomeric layers 9 . 11 measured directly from the frequency of the radar radiation to be damped. An odd multiple of lambda quarter of the wavelength used determines the thickness.

The elastomer layer 9 consists of chloroprene rubber. The elastomer layer 11 is also made of chloroprene rubber. The catcher layer 15 , ie outer layer 5 , with the lowest dielectric constant ε _r , consists of driven halogen-butyl rubber. Your thickness 21 is> 1 mm.

The layer structure 1 is firmly connected by vulcanization.

Function:

The radar radiation 23 gets from the catcher layer 15 not reflected. The elastomer layers 9 . 11 absorb the radar radiation 23 , On the way back the radiation through the substructure 7 and through the capture layer 15 there is a further damping.

Thereby is a sustainable reduction, for example halving the Enlightenment depth enemy radar guaranteed.

Further minimization of radar radiation 23 is according to 2 through a diffusion surface 31 a catcher layer 35 reached. Different radii 32 . 33 . 34 without refractive edges and without even gaps form the diffusion surface 31 ,

These can also be called foliage structure or network similar to the chaos structure of a Wood wool be formed.

The layer structure 1 can be designed as a module, which is connected to the outer wall 3 can be connected in many ways.

For the basic attenuation is essential that the dielectric constant of the layers 9 . 11 . 15 in the direction of the arrow 40 increases.

1

layer structure

3

wall of a vehicle

5

outer layer

7

substructure

9

elastomer layer

11

elastomer layer

13

damping layer

15

scavenging layer

17

thickness

19

thickness

21

thickness

23

radar radiation

31

diffusion surface

32

radius

33

radius

34

radius

40

arrow

Claims (6)

Radiation radiation attenuation filter comprising an elastomeric layer plate ( 1 ), which consists of several elastomer layers ( 5 . 9 . 11 ) Chloroprene rubber, nitrile-butadiene rubber, chlorobutyl rubber, butyl rubber or carbon nanotubes or fibers, characterized in that the outer layer ( 5 ) of the elastomeric layer plate ( 1 ) as catcher layer ( 15 ) and is made of chlorobutyl rubber, and that at least two different elastomer layers ( 9 . 11 ) under the outer layer ( 5 ) as a damping layer ( 13 ) are arranged. Radiation filter according to claim 1, wherein the scavenger layer ( 15 ) has on its outer side a diffusion surface. Radiation filter according to claim 1 or 2, wherein the dielectric constant of each lower elastomer layer ( 9 . 11 ) is greater than that of the overlying elastomer layer ( 5 . 9 ). Radiation filter according to one of the preceding claims, wherein the elastomer layers ( 5 . 9 . 11 ) are bonded together by vulcanization or permanent bonding. Radiation filter according to one of the preceding claims, wherein the thickness ( 17 . 19 ) of the at least two different elastomer layers ( 9 . 11 ) under the outer layer ( 5 ) Is 1 to 3 mm. Radiation filter according to one of the preceding claims, wherein the thickness ( 21 ) of the catcher layer ( 15 ) is more than 1 mm.