Abstract: A basic antenna (2), designed to form a radiating element of an array antenna, includes, superimposed, a planar reflector (4), a probe (6), and an assembly (8) of the EBG type by default in the form of a cavity (16). The basic antenna (2) includes a wall enclosure (10) capable of reflecting the electromagnetic waves at the operating frequency or frequencies of the basic antenna (2), the wall enclosure (10) being an extension in a direction orthogonal to the planar reflector (4) and simultaneously surrounding only the probe (6), the cavity (16) and the structure (14). The one- or two-dimensional array antenna includes a plurality of joined basic antennas (2) arranged compactly.

Abstract: A basic antenna (2), designed to form a radiating element of an array antenna, includes, superimposed, a planar reflector (4), a probe (6), and an assembly (8) of the EBG type by default in the form of a cavity (16). The basic antenna (2) includes a wall enclosure (10) capable of reflecting the electromagnetic waves at the operating frequency or frequencies of the basic antenna (2), the wall enclosure (10) being an extension in a direction orthogonal to the planar reflector (4) and simultaneously surrounding only the probe (6), the cavity (16) and the structure (14). The one- or two-dimensional array antenna includes a plurality of joined basic antennas (2) arranged compactly.

Abstract: An antenna uses a photonic forbidden band (PFB) material in which, by default, a surface (26) for injecting and/or receiving electromagnetic waves in a resonance cavity of the antenna (8) has at least a width or a length of a diameter higher than or equal to the wavelength of the working frequency.

Abstract: The invention relates to an antenna for transmitting or receiving electromagnetic waves at a working frequency fT, that comprises a resonator with a filtering (49) coating that covers the major portion of the upper face of a reflector (22) located inside a cavity (36), the coating (40) being capable of removing all the electromagnetic waves having a frequency fT, and propagating in a direction parallel to the upper face of the reflector, without removing all the electromagnetic waves having a frequency fT and propagating in a direction perpendicular to the upper face of the reflector.

Abstract: The invention relates to an antenna for transmitting or receiving electromagnetic waves at a working frequency f?, that comprises a resonator with a filtering (49) coating that covers the major portion of the upper face of a reflector (22) located inside a cavity (36), the coating (40) being capable of removing all the electromagnetic waves having a frequency f? and propagating in a direction parallel to the upper face of the reflector, without removing all the electromagnetic waves having a frequency f? and propagating in a direction perpendicular to the upper face of the reflector.

Abstract: An antenna uses a photonic forbidden band (PFB) material in which, by default, a surface (26) for injecting and/or receiving electromagnetic waves in a resonance cavity of the antenna (8) has at least a width or a length of a diameter higher than or equal to the wavelength of the working frequency.

Abstract: A frequency multiband antenna includes a photonic bandgap material having at least one band gap, one single periodicity defect of the bandgap material so as to produce several narrow bandwidths within the at least one band gap of the bandgap material, and an excitation device capable of transmitting and/or receiving electromagnetic waves within the narrow bandwidths.

Abstract: A antenna made from a photonic band-gap (PBG) material, includes: a lateral wall (4) which is made from a PBG material and which completely surrounds a central axis (6), the wall being disposed at a distance from the central axis such as to form a central resonant cavity; and at least one radiating element (34) which is placed inside the cavity. Each radiating element is positioned inside the cavity in order to excite an electromagnetic field parallel to the central axis and the radiating element(s) can excite the modes of the central cavity having a radial resonance more strongly than the other modes of the cavity.

Abstract: A antenna made from a photonic band-gap (PBG) material, includes: a lateral wall (4) which is made from a PBG material and which completely surrounds a central axis (6), the wall being disposed at a distance from the central axis such as to form a central resonant cavity; and at least one radiating element (34) which is placed inside the cavity. Each radiating element is positioned inside the cavity in order to excite an electromagnetic field parallel to the central axis and the radiating element(s) can excite the modes of the central cavity having a radial resonance more strongly than the other modes of the cavity.

Abstract: A multibeam antenna includes: a photonic bandgap material (20) having at least one band gap; at least one periodicity defect so as to produce at least one narrow bandwidth inside the at least one band gap of the photonic bandgap material, and excitation elements (50 to 43) for enabling electromagnetic waves to be received inside the at least one narrow bandwidth. The excitation elements are mutually arranged so as to generate radiating spots (46 to 49) partly overlapping on one surface of the photonic bandgap material.

Abstract: A system includes a device for focusing electromagnetic waves, and a multiple-beam antenna. The antenna includes: a photonic bandgap material (20) having at least one band gap, at least one periodicity defect (36) of the photonic bandgap material so as to produce at least one narrow bandwidth within the bandgap material, and excitation elements (40 to 43) for transmitting and/or receiving electromagnetic waves within the at least one narrow bandwidth, the elements being arranged relative to one another so as to produce overlapping radiating spots.

Abstract: An omnidirectional resonant antenna in a half-plane or in the whole plane comprises a single radiating electric conductor (26) having at least three abutted wires (28, 30, 32), the length of each wire and the orientation of the wires relative to one another determining the global orientation of the electric conductor. The wires are oriented along at least three different spatial directions and the lengths of the wires are designed to obtain an omnidirectional global radiation of the electric conductor in a half-plane or in the whole plane.

Abstract: The invention concerns a multibeam antenna comprising: a photonic bandgap material (20) having at least one band gap; at least on e periodicity defect so as to produce at least one narrow bandwidth inside said at least one band gap of said photonic bandgap material, and excitation elements (50 to 43) for enabling electromagnetic waves to be received inside said at least one narrow bandwidth. The excitation elements are mutually arranged so as to generate radiating spots (46 to 49) partly overlapping on one surface of the photonic bandgap material.

Abstract: A system includes a device for focusing electromagnetic waves, and a multiple-beam antenna. The antenna includes: a photonic bandgap material (20) having at least one band gap, at least one periodicity defect (36) of the photonic bandgap material so as to produce at least one narrow bandwidth within the bandgap material, and excitation elements (40 to 43) for transmitting and/or receiving electromagnetic waves within the at least one narrow bandwidth, the elements being arranged relative to one another so as to produce overlapping radiating spots.

Abstract: A frequency multiband antenna comprising: a photonic bandgap material (142) having at least one band gap, one single periodicity defect (156) of the bandgap material so as to produce several narrow bandwidths within the at least one band gap of the bandgap material, and an excitation device (160, 162) capable of transmitting and/or receiving electromagnetic waves within the narrow bandwidths.

Abstract: A broadband or multiband antenna for microwaves, optical transmission or mobile telephones in which a reflector plane and at least one radiating element disposed in the vicinity of the reflector plane are provided. An assembly of defective PFB material elements is superposed on the reflector plane and the radiating element. Each defective PFB material element is substantially plane, parallel to the reflector, and presents at least one characteristic of magnetic permeability, of dielectric permittivity, and/or of thickness in the direction perpendicular to the reflector that differs from one defective PFB material element to another. The assembly forms a leaky resonant cavity.

Abstract: The invention concerns a broadband or multiband antenna for microwaves, comprising a reflector plane (R) and at least a radiating element (ER) arranged proximate to the reflector plane (R). A assembly of photonic forbidden band material default elements is superimposed on the reflector plane (R) and the radiating element (ER). Each photonic forbidden band material default element is substantially planar, parallel to the reflector (R) and has at least a characteristic of magnetic permeability of dielectric permittivity and/or thickness in the direction perpendicular to the reflector (R) different from one element of photonic forbidden band material to the next. The assembly forms a leaky resonant cavity. The invention is applicable to mobile telephone systems, or optical path transmissions.

Abstract: The invention concerns an omnidirectional resonant antenna in a half-plane or in the whole plane comprising a single radiating electric conductor (26) consisting of at least three abutted wires (28, 30, 32), the length of each wire and the orientation of the wires relative to one another determining the global orientation of the electric conductor. The invention is characterised in that the wires are oriented along at least three different spatial directions and the lengths of the wires are designed to obtain a global radiation of the omnidirectional electric conductor in a half-plane or in the whole plane.

Abstract: The invention relates to an antenna comprising: a first electroconductive surface (120); a second electroconductive surface (140) which forms a ground plane and is parallel to the first; a first electroconductive feed belt or wire (150) connecting a first terminal of a generator/receiver to the first surface (120), the second surface (140) being connected to the second terminal of the generator/receiver; and at least one second electroconductive wire or ribbon (160) connecting said two surfaces (120,140). The antenna is characterized in that the first surface (120) comprises a blank (122), or a series of blanks (122), each blank optionally consisting of mutually extending sections. Said blank(s) (122) extend in the vicinity of and along part of the edge of the first surface (120) which is broad enough for the blank(s) (122) to define an inner area (126) of the first surface (120) by substantially forming a majority of the periphery of this area (126), thereby obtaining a multi-frequency wire-plate operation.

Abstract: A monopole wire-plate antenna comprising a ground plane (10), a first radiating element in the form of a capacity top (11, 12) adapted to be connected to a generator, and a second radiating element in the form of a conductor wire (14, 14′, 15, 15′) connecting the capacity top to the ground plane is disclosed. It comprises a plurality of at least one of said radiating elements.