Showing papers on "Feed horn published in 1967"
Patent•
25 May 1967TL;DR: In this paper, current flow is suppressed on the outer surface of the horn except in a small endmost region, where a reflector surrounds the horn, spaced rearwardly from the mouth.
Abstract: Current-flow is suppressed on the outer surface of the horn except in a small endmost region. A reflector surrounds the horn, spaced rearwardly from the mouth. A choke used for the suppression blocks current-flow between the horn and the reflector. A high degree of uniformity of the radiation pattern over a wide forward angle is achieved.
17 citations
TL;DR: In this article, a method for specifying the required field distribution over the aperture of the feed system, and the primary illumination and gain resulting from this distribution are derived for a spherical reflector.
Abstract: The problem of designing a feed system for illuminating a spherical reflector is examined. A method is proposed for specifying the required field distribution over the aperture of the feed system, and the primary illumination and gain resulting from this distribution are derived. The results indicate that a significantly smaller feed aperture can be employed than would be indicated by conventional ray tracing methods. Specific numerical results are obtained by taking the Arecibo antenna as an example, for which a calculated aperture efficiency of 67.5 percent is possible with approximately a 38-foot-diameter aperture feed.
11 citations
TL;DR: A correcting feed, illuminating a 600-ft circle of the Arecibo Ionospheric Observatory reflector, has been built at 611 MHz as discussed by the authors, which has two major components, a four-element linear array with a reflecting screen and a 16-element Linear Array.
Abstract: A correcting feed, illuminating a 600-ft circle of the Arecibo Ionospheric Observatory reflector, has been built at 611 MHz. The feed has two major components, a four-element linear array with a reflecting screen and a 16-element linear array. The antenna gain is 56 dB and the 3-dB width of the principal lobe is about 9 minutes of arc.
2 citations
01 Jan 1967
TL;DR: In this article, a shortened horn-reflector antenna overcomes the mechanical disadvantages and complexity of the conventional horn reflector antenna by offering broadband performance, economic construction, very low antenna temperature, and excellent pattern performance.
Abstract: A shortened horn-reflector antenna overcomes the mechanical disadvantages and complexity of the conventional horn-reflector antenna. The shortened antenna offers broadband performance, economic construction, very low antenna temperature, and excellent pattern performance.
2 citations
01 Mar 1967
TL;DR: The use of a horn radiator with sector-shaped radiation pattern rednces the reaction of a rotation-symmetrical parabolic reflector to less than one quarter of the reaction with conventional horn radiators as mentioned in this paper.
Abstract: The use of a horn radiator with sector-shaped radiation pattern rednces the reaction of a rotation-symmetrical parabolic reflector to less than one quarter of the reaction with conventional horn radiators. No vertex plate is necessary.