DIFFRACTION DEVICE INTENDED TO BE FIXED ONTO THE OUTER FACE OF A WALL

• US 20150270621A1
• Filed: 03/18/2015
• Published: 09/24/2015
• Est. Priority Date: 03/19/2014
• Status: Active Grant

• Current Assignee: Airbus Operations SAS (Airbus SE)
• Original Assignee: Airbus Operations (European Aeronautic Defence and Space Company EADS NV)
• Inventors: Thain, Andrew, Jaber, Anass
• Granted Patent: US 9,755,316 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: E04F 13/0871 having an ornamental or specially shaped visible surface E04F13/0867 takes precedence
• CPC Class Codes: H01Q 1/422 comprising two or more layers of dielectric material H01Q1/425 takes precedence
• CPC Class Codes: H01Q 1/528 reducing the re-radiation of a support structure in a parabolic reflector antenna H01Q19/023
• CPC Class Codes: H01Q 15/0006 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 Class Codes: H01Q 15/14 Reflecting surfaces; Equivalent structures electromagnetic shields H01Q1/526
• CPC Class Codes: H01Q 15/145 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 Class Codes: H05K 9/0001 Rooms or chambers anechoic chambers G01R29/0821

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.

Claims

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, 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. 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 according to claim 1 fixed to each lower surface and to each upper surface, and

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 the radar waves.

11. 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 according to claim 1 fixed to each left lateral surface and each right lateral surface, and

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 the radar waves.