Abstract: The invention provides an antenna characterized in that it comprises a generator and at least two metal surfaces that are mutually parallel and substantially superposed; at least one of the surfaces being split into at least two concentric portions constituting a central portion and a strip surrounding the central portion; said at least two portions being interconnected by one or more conductive strips or wires; the at least two superposed surfaces being interconnected by at least one conductive wire or strip; and the at least two portions of the split surface including a portion connected to a first terminal of the generator and a portion connected to a second terminal of the generator; this structure imparting multifunctional behavior to the antenna.

Abstract: The invention relates to an antenna comprising: a first electroconductive surface; a second electroconductive surface which forms a ground plane and is parallel to the first; a first electroconductive feed belt or wire connecting a first terminal of a generator/receiver to the first surface, the second surface being connected to the second terminal of the generator/receiver, and at least one second electroconductive wire or ribbon connecting said two surfaces. The antenna is characterized in that the first surface comprises a blank, or a series of blanks, each blank optionally consisting of mutually extending sections. Said blank(s) extend in the vicinity of and along part of the edge of the first surface 2 which is broad enough for the blank(s) to define an inner area of the first surface by substantially forming a majority of the periphery of this area, thereby obtaining a multi-frequency wire-plate operation.

Abstract: A device for electromagnetic characterization of a tested structure elevates, on a predetermined frequency band, distribution parameters of the structure and parameters characteristic of the spurious rays of the structure. The device includes an electric signal generator and an analyzer for analyzing the signal transmitted by the generator and signals reflected by the structure and signals transmitted by the structure. In addition, the electric signal generator is a pulsed signal generator whereof the spectrum is at least as broad as the predetermined frequency band, and the analyzer includes a filter for temporal filtering of the signals it receives, to eliminate spurious signals.

Abstract: The invention provides an antenna characterized in that it comprises a generator and at least two metal surfaces that are mutually parallel and substantially superposed;

Abstract: The invention concerns a device for electromagnetic characterisation of a tested structure (2), by evaluating, on a predetermined frequency band, distribution parameters of said structure (2) and parameters characteristic of the spurious rays of said structure (2), comprising an electric signal generator (4), means (8) for transmitting said electric signal to the tested structure (2), means (6) for analysing the signal transmitted by the generator (4) and signals reflected by the structure (2) and signals transmitted by the structure (2), the analysing means (6) comprising means for calculating said parameters. In addition, the electric signal generator (4) is a pulsed signal generator whereof the spectrum is at least as broad as said predetermined frequency band, and the analysing means (6) comprise means for temporal filtering of the signals it receives, to eliminate spurious signals.

Abstract: An antenna includes a probe capable of transforming electrical energy into electromagnetic energy and inversely. It further includes an assembly of elements made of at least two materials different in permittivity and/or permeability and/or conductivity within which the probe is arranged, the arrangement of the elements in the assembly ensuring radiation and spatial and frequency filtering of the electromagnetic waves produced or received by the probe, which filtering allows in particular one or several operating frequencies (f) of the antenna inside a frequency band gap (B).

Abstract: An antenna of the type comprising a first electrically conductive surface (12), a second electrically conductive surface (14) forming a ground plane parallel to the first electrically conductive surface, and a first electrically conductive feed wire or strip (16) is provided. The first electrically conductive feed wire or strip (16) links a first terminal of a generator/receiver (20) to the first electrically conductive surface (12). A second electrically conductive feed wire or strip (17) links a second terminal of a generator/receiver (20) to the second electrically conductive surface (14). At least one electrically conductive wire or strip (18, 19) links the first electrically conductive surface (12) and the second electrically conductive surface (14). The first electrically conductive surface, the second electrically conductive surface, and the at least one electrically conductive wire or strip (18, 19) linking the first and second electrically conductive surfaces (12, 14) are all coplanar.