摘要:
The invention concerns 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 said at least one band gap of said bandgap material, and an excitation device (160, 162) capable of transmitting and/or receiving electromagnetic waves within the narrow bandwidths.
摘要:
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.
摘要:
The invention concerns a reflector forming a parabolic antenna characterised in that it consists on n contiguous blades made of dielectric material defined by n+1 surfaces of separate parabolic equations configured to define a common electromagnetic focus.
摘要:
The invention concerns a system comprising a device for focusing electromagnetic waves, and a multiple-beam antenna. The antenna comprises: 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 said bandgap material, and excitation elements (40 to 43) for transmitting and/or receiving electromagnetic waves within said at least one narrow bandwidth, said elements being arranged relative to one another so as to produce overlapping radiating spots.
摘要:
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.
摘要:
The invention relates to an antenna for transmitting or receiving electromagnetic waves at a working frequency fτ, 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), said coating (40) being capable of removing all the electromagnetic waves having a frequency fτ and propagating in a direction parallel to the upper face of the reflector, without removing all the electromagnetic waves having a frequency fτ and propagating in a direction perpendicular to the upper face of the reflector.
摘要:
The invention relates to an antenna using 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.
摘要:
The invention relates to an antenna for transmitting or receiving electromagnetic waves at a working frequency fτ, 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), said coating (40) being capable of removing all the electromagnetic waves having a frequency fτ and propagating in a direction parallel to the upper face of the reflector, without removing all the electromagnetic waves having a frequency fτ and propagating in a direction perpendicular to the upper face of the reflector.
摘要:
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.