Diffraction device intended to be fixed onto the outer face of a wall

Patent metadata

Field	Value
Publication number	US-9755316-B2
Application number	US-201514661200-A
Country	US
Kind code	B2
Filing date	Mar 18, 2015
Priority date	Mar 19, 2014
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

An electromagnetic wave diffraction device for fixing onto an outer wall face comprising a plurality of electrically conductive resonant elements having an L-shaped profile fixed parallel on the outer face. Each element comprises a first and second wall secured at right angles to one another along a common edge. The first wall is fixed at a right angle to the outer face by a fixing edge parallel to the common edge. The second wall has a free edge parallel to the common edge. The free edges of all elements are parallel and arranged on the same side relative to the common edge of the corresponding element. A weather protection arrangement for reinforcing the protection of a capacitive area generated in a space between the outer face and the second wall, in the form of a water impermeable dielectric material panel, is fixed to the outer face and covers the elements.

First claim

The invention claimed is:

1. An electromagnetic wave diffraction device intended to be fixed onto an outer face of an electrically conductive wall, the diffraction device comprising:
a plurality of resonant elements in the form of an L-shaped profile which are electrically conductive and fixed parallel on the outer face,
each resonant element comprising a first wall and a second wall secured at right angles to one another along a common edge, the first wall being intended to be fixed at right angles to the outer face by a fixing edge parallel to the common edge, whereas the edge of the second wall which is parallel to the common edge constitutes a free edge, and where the free edges of all the resonant elements are parallel and arranged on the same side relative to the common edge of the corresponding resonant element such that the plurality of resonant elements define continuous gaps between the first walls of adjacent resonant elements, and
a protection arrangement configured to reinforce the protection of a capacitive area generated in a space between the outer face and the second wall, against weather attack, and taking the form of a panel produced with a dielectric material that is impermeable to water, fixed to the outer face and covering the plurality of resonant elements.

2. The diffraction device according to claim 1 , wherein the length of the first wall and the length of the second wall are defined as a function of a wavelength and of an angle of incidence of an incident radiofrequency wave to be diffracted.

3. The diffraction device according to claim 1 , wherein a block produced with a dielectric material that is impermeable to water is housed between the outer face and the second wall so as to fill the internal volume of the L-shaped resonant element.

4. The diffraction device according to claim 1 , wherein at least a part of said panel is transparent in the visible spectrum.

5. The diffraction device according to claim 1 , wherein the resonant elements are made of a material that is transparent in the visible spectrum.

6. A building comprising an electrically conductive outer wall having an outer face and an electromagnetic wave diffraction device according to claim 1 , in which each resonant element is fixed onto said outer face.

7. An equipped wall comprising:
an electrically conductive wall having an outer face and intended to be fixed onto an outer wall of a building, and
an electromagnetic wave diffraction device according to claim 1 , in which each resonant element is fixed onto said outer face.

8. An equipped wall according to claim 7 , wherein at least a part of the wall is transparent in the visible spectrum.

9. A building comprising an outer wall and an equipped wall according to claim 7 , in which said equipped wall is fixed onto the outer wall.

10. The diffraction device of claim 1 , wherein each resonant element consists of the first wall and the second wall.

11. The diffraction device of claim 1 , wherein the continuous gap between adjacent resonant elements is an open gap.

12. The diffraction device of claim 1 , wherein a dielectric material is disposed within each continuous gap between adjacent resonant elements.

13. The diffraction device of claim 1 , wherein a fixing edge is disposed within each continuous gap between adjacent resonant elements.

14. The diffraction device of claim 1 , wherein the continuous gap between adjacent resonant elements is either an open gap or is partially filled with at least one of a dielectric material or a fixing edge.

15. A building comprising:
an outer wall having an outer face and a plurality of apertures arranged horizontally to one another, thus defining, on the outer face below the horizontal alignment of apertures, a lower surface and, above the horizontal alignment of apertures, an upper surface,
for each lower surface and each upper surface, a diffraction device fixed to each lower surface and to each upper surface such that at least a part of the outer face is not covered by the diffraction device or pierced with the apertures, wherein each diffraction device comprises:
a plurality of resonant elements in the form of an L-shaped profile which are electrically conductive and fixed parallel on the outer face, each resonant element comprising a first wall and a second wall secured at right angles to one another along a common edge, the first wall being intended to be fixed at right angles to the outer face by a fixing edge parallel to the common edge, whereas the edge of the second wall which is parallel to the common edge constitutes a free edge, and where the free edges of all the resonant elements are parallel and arranged on the same side relative to the common edge of the corresponding resonant element, and
a protection arrangement configured to reinforce the protection of a capacitive area generated in a space between the outer face and the second wall, against weather attack, and taking the form of a panel produced with a dielectric material that is impermeable to water, fixed to the outer face and covering the plurality of resonant elements,

wherein each part of the outer face which is not covered by the diffraction devices or pierced with the apertures is covered with a coating absorbing electromagnetic waves.

16. A building comprising:
an outer wall having an outer face and a plurality of apertures arranged vertically to one another, thus defining, on the outer face to the left of each vertical alignment of apertures, a left lateral surface and, to the right of each vertical alignment of apertures, a right lateral surface,
for each left lateral surface and each right lateral surface, a diffraction device fixed to each left lateral surface and each right lateral surface such that at least a part of the outer face is not covered by the diffraction device or pierced with the apertures, wherein each diffraction device comprises:
a plurality of resonant elements in the form of an L-shaped profile which are electrically conductive and fixed parallel on the outer face, each resonant element comprising a first wall and a second wall secured at right angles to one another along a common edge, the first wall being intended to be fixed at right angles to the outer face by a fixing edge parallel to the common edge, whereas the edge of the second wall which is parallel to the common edge constitutes a free edge, and where the free edges of all the resonant elements are parallel and arranged on the same side relative to the common edge of the corresponding resonant element, and
a protection arrangement configured to reinforce the protection of a capacitive area generated in a space between the outer face and the second wall, against weather attack, and taking the form of a panel produced with a dielectric material that is impermeable to water, fixed to the outer face and covering the plurality of resonant elements,

wherein each part of the outer face which is not covered by the diffraction devices or pierced with the apertures is covered with a coating absorbing electromagnetic waves.

Assignees

• Airbus Operations Sas
• Airbus Operations Sas

Inventors

• Thain Andrew
• Jaber Anass

Classifications

• H01Q15/145

  comprising a plurality of reflecting particles, e.g. radar chaff (missiles of the signal type provided with means for disseminating radar-reflecting chaff F42B12/70) · CPC title

• E04F13/0871

  having an ornamental or specially shaped visible surface (E04F13/0867 takes precedence) · CPC title

• H01Q1/528

  reducing the re-radiation of a support structure (in a parabolic reflector antenna H01Q19/023) · CPC title

• H01Q15/0006 Primary

  Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices (H01Q15/12, H01Q15/22, H01Q15/24 take precedence) · CPC title

• H01Q1/422 Primary

  comprising two or more layers of dielectric material (H01Q1/425 takes precedence) · CPC title