RF antenna
AssigneeAmphenol Socapex
InventorsAyoub Annabi, Roland Vincent, Frederic Diximus
Life of this patent
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Abstract
The invention provides an elongate antenna. The radiating portion of the antenna is constituted by an elongate conductor element which is machined to constitute: N dipoles (where N is an integer not less than 2) made up of N rectilinear sections of said element in alignment; and N-1 phase-shifter elements, each phase-shifter element being interposed between two consecutive dipoles, each phase-shifter element being constituted by a section of said elongate conductor element folded into a U-shape having branches which are substantially juxtaposed and which extend in a direction that is orthogonal to the common direction of said dipoles.
Claims5
1/ An elongate antenna wherein its radiating portion is constituted by an elongate conductor element which is machined so as to make up:
- N dipoles (where N is an integer not less than 2) made up of N rectilinear sections of said element in alignment;
- and
- N-1 phase-shifter elements, each phase-shifter element being interposed between two consecutive dipoles, each phase-shifter element being constituted by a section of said elongate conductor element folded into a U-shape with branches which are substantially juxtaposed and which extend in a direction that is orthogonal to the common direction of said dipoles, said radiating element being connected at one of its ends to the central conductor of a coaxial cable;
- said coaxial cable is provided close to its end connected to the antenna with means forming an impedance-matching cavity;
- and
- said coaxial cable is provided close to the impedance-matching cavity on its side remote from the antenna with means constituting a trap for leakage currents.
2/ An antenna according to claim 1, wherein the length of each dipole is equal to λ2 and the length of each branch of the phase-shifter element is equal to λ4, where λ is the wavelength of the center frequency of the frequency band in which the antenna operates.
3/ An antenna according to claim 1, wherein the radiating portion is constituted by a single elongate conductor element, folded to form said phase shifters.
4/ An antenna according to claim 1, wherein the radiating portion of the antenna is made from a single conductive strip of constant right section which is folded to form the phase shifters.
5/ An antenna according to claim 1, wherein each dipole is of a different physical length, said wavelengths being included within a given band of wavelengths.