Feed horn

About: Feed horn is a research topic. Over the lifetime, 2395 publications have been published within this topic receiving 26548 citations. The topic is also known as: feedhorn.

Radio transmitter/radio receiver unit comprising a tuneable antenna

Abstract: The invention relates to a radio transmitter/radio receiver unit which is capable of transmitting and receiving in different frequency ranges with a stable antenna gain that remains practically constant. According to the invention, a dielectric body, whose dielectricity can be modified is placed in the vicinity of an antenna body. A control unit supplies a d.c. voltage to the antenna which causes the dielectricity of the dielectric body to be modified. The control unit modifies the d.c. voltage value until the dielectricity guarantees an optimum value for at least one physical input variable, which represents the reception and transmission quality.

Antenna system for a level measuring device

Abstract: The present invention relates to antenna system for a level measuring device for measuring a filling level of a filling product in a receptacle by means of microwave signals. The antenna system comprises an antenna horn (2) having an inner antenna horn flaring zone, and a planar structure (4) present in the antenna horn flaring zone. The planar structure (4) couples microwave signals into the antenna horn (2) for determining the filling level of the filling product, which microwave signals are then emitted by the anetnna horn (2) into the direction of the filling product.

Variations of Linear Polarization in Extragalactic Radio Sources

Abstract: SINCE mid-1965 the linear polarizations of the stronger extragalactic variable radio sources have been monitored at 8 GHz using the University of Michigan 85-foot paraboloid equipped with a rotating, linearly polarized feed horn. Strong thermal and non-thermal sources were measured each observing day to determine the stability of the instrumental polarization. Five sources, 3C 120, 3C 273, 30 279, 3C 345 and 3C 454.3, have exhibited significant changes in polarization, and three sources, 3C 84, NRAO 150 and 3C 446, are suspected of having variable polarizations. Preliminary observational results for several of these sources have been reported previously1–2.

Parabolic antenna capable of adjusting the elevation angle of a feed horn

Abstract: A parabolic antenna provided with a reflector and an arm comprises a housing fixed to a free end of the arm, a case enclosing a low noise blockdown converter ("LNB"), a feed horn protruding from a front side of the LNB case and a driving and a driven gears for adjusting an elevation angle of the feed horn. The LNB case has a pair of hinge pins. The housing has a pair of supporting members which are spaced from each other and provided with a pair of apertures into which the hinge pins of the LNB case are snugly fitted, respectively. The driven gear is engaged on one of the hinge pins of the LNB case and the driving gear is engaged on an input shaft. The input shaft rotatably passes through one of the supporting members, the driving gear and the driven gear being meshed with each other and, in turn, rotated with the input shaft, thereby allowing the elevation angle of the feed horn can be adjusted by rotating the input shaft.

Antenna for producing Bessel wave beam

Abstract: The invention belongs to the field of forming of electromagnetic wave beams, and provides an antenna for producing a Bessel wave beam. The antenna comprises a beam bunching plane and a feed horn, wherein the feed horn is directly opposite to the center of the beam bunching plane; the beam bunching plane is in a dual-layer dielectric substrate structure with a beam bunching function and comprises a lower printed circuit layer, a lower high-frequency dielectric substrate layer, a middle printed circuit layer, an upper high-frequency dielectric substrate layer and an upper printed circuit layer, which are coaxially stacked in order from bottom to top; the upper high-frequency dielectric substrate layer and the lower high-frequency dielectric substrate layer have rectangular plane structures which are the same in size; the upper printed circuit layer, the middle printed circuit layer and the lower printed circuit layer all are provided with beam bunching units which are arranged in a grid, and are the same in grid distribution; and a metal patch is arranged in each beam bunching unit and is located at the center of the grid cell. The antenna is simple in structure, low in processing cost, high in beam bunching efficiency, large in effective bandwidth and high in application band.