摘要:
An antenna array (10) is provided. Said antenna array (10) comprises at least two antennas with at least two reflectors (12a, 12b, 12c, 12d). In this context, at least two adjacent reflectors of the at least two reflectors (12a, 12b, 12c, 12d) are connected with a double-tangential blended elliptical surface (13a, 13b, 13c, 13d).
摘要:
Various embodiments of antenna assemblies are disclosed herein. In one embodiment, the antenna assembly includes a reflector comprising a center opening, a feed-antenna subassembly situated in front of the reflector, a rear housing situated behind the reflector, and a pole-mounting bracket comprising a base plate situated between the reflector and the rear housing. The feed-antenna subassembly comprises a feed tube that houses at least one of: a transmitter circuit and a receiver circuit. The rear housing is coupled to a front side of the reflector via the center opening. The rear housing comprises a center cavity, and a back end of the feed tube is inserted in and coupled to the center cavity. The base plate is coupled to the reflector and the rear housing in such a way that decoupling between the base plate and the reflector requires a prior decoupling between the feed-antenna subassembly and the rear housing and a prior decoupling between the rear housing and the reflector.
摘要:
A low cost passive electronic scanning array based on a Dielectric Traveling Wave Array (DTWA) technology that uses micro-actuated control of a waveguide transmission medium feeding the array elements to steer the array beam. Array gain is achieved by coherently combining element outputs with very low loss, weighted waveguide directional couplers. By modifying the propagation delay of the dielectric-filled waveguide through the introduction of a variable air gap, the radiated phase of the coupled patch array elements is changed, steering the beam accordingly. Since the circuitry is passive and bi-directional, the same antenna array can be used on receive or transmit unlike an active phased array that requires transmit/receiver switching. The design has been validated at Ku-Band through brassboard testing and is scalable with simulation at Ka-Band, steering the beam over a Field of Regard (FoR) of +/- 50o with nearly uniform gain. The approach provides phase control without active components at each individual array element, which significantly reduces the cost of a phased array by at least an order of magnitude.
摘要:
Le système optique d'antenne comporte au moins un premier réflecteur (10) et une ouverture rayonnante primaire (11) illuminant le premier réflecteur (10), le premier réflecteur comportant des courbures différentes selon deux plans orthogonaux. L'ouverture rayonnante primaire (11) a une forme longiligne s'étendant dans un premier plan. Dans ce premier plan contenant l'ouverture rayonnante primaire, le premier réflecteur (10) comporte une première courbure directrice (CD) ayant un premier foyer (F2) localisé en arrière de l'ouverture rayonnante primaire (11), et dans un deuxième plan central Π 0 perpendiculaire au premier plan, le deuxième plan central Π 0 passant par le premier foyer (F2) et coupant l'ouverture rayonnante primaire en un premier point d'intersection situé en un point central de l'ouverture rayonnante primaire, le premier réflecteur (10) comporte au moins une deuxième courbure (C0) ayant un deuxième foyer (F0) différent du premier foyer (F2) et situé au point central de l'ouverture rayonnante primaire (11).