Device for controlling RF electromagnetic beams according to their angle of incidence, and manufacturing method

A device for controlling radiofrequency beams that is defined in an orthogonal reference frame (X,Y,Z), the device generally extending in the plane (X,Y) of said orthogonal reference frame (X,Y,Z), the device comprising an array of cells, each cell corresponding to a radiating element, said cell comprising a support frame and an excitation element for exciting said radiating element, each radiofrequency beam being defined according to a given direction of propagation having an angle of incidence θ with respect to said device, wherein said support frame is inscribed within a generally tubular shape oriented along the axis Z of said orthogonal reference frame (X,Y,Z), said tubular shape having a given length dz along the axis of the frame Z and a cross section defined in the plane (X,Y), said cross section having a perimeter P, said support frame comprising a frame entrance and a frame exit, said support frame furthermore comprising a number N of slots extending, along the axis of the frame Z, between said frame exit and a slot position Z0n along the axis of the frame Z, said slot position Z0n being located between said frame entrance and said frame exit, each slot having a variable slot width

• n
• along the axis of the frame Z, said slot width
• n
• having a minimum slot value
• n
• min
• at said slot position Z0n, and a maximum slot value
• n
• max
• at the frame exit, the maximum slot value
• n
• max
• being determined on the basis of the perimeter P of the cross section and the number N of slots, the excitation element comprising what is referred to as a “Vivaldi” antipodal transition arranged at least partly inside said tubular shape, the transition comprising at least a first metal etching and a second metal etching extending along the axis of the frame Z between said frame entrance and an etching position Z0g, said etching position Z0g being defined between said frame entrance and said frame exit, each cell being configured to emit and/or receive radiofrequency beams in an invariant manner according to said direction of propagation.

A device for controlling radiofrequency beams that is defined in an orthogonal reference frame (X,Y,Z), the device generally extending in the plane (X, Y) of said orthogonal reference frame (X,Y,Z), the device comprising an array of cells, each cell corresponding to a radiating element, said cell comprising a support frame and an excitation element for exciting said radiating element, each radiofrequency beam being defined according to a given direction of propagation having an angle of incidence θ with respect to said device, wherein said support frame is inscribed within a generally tubular shape oriented along the axis Z of said orthogonal reference frame (X, Y,Z), said tubular shape having a given length dz along the axis of the frame Z and a cross section defined in the plane (X,Y), said cross section having a perimeter P, said support frame comprising a frame entrance and a frame exit, said support frame furthermore comprising a number N of slots extending, along the axis of the frame Z, between said frame exit and a slot position Z0n along the axis of the frame Z, said slot position Z0n being located between said frame entrance and said frame exit, each slot having a variable slot width

• n
• along the axis of the frame Z, said slot width
• n
• having a minimum slot value
• n
• min
• at said slot position Z0n, and a maximum slot value
• n
• max
• at the frame exit, the maximum slot value
• n
• max
• being determined on the basis of the perimeter P of the cross section and the number N of slots, the excitation element comprising a number T of planar metal elements arranged inside said tubular shape, a planar element extending along the plane (X, Y) at a planar position Zt, said planar position Zt being defined between said frame entrance and said frame exit, each cell being configured to emit and/or receive radiofrequency beams in an invariant manner according to said direction of propagation.