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.

Lens antenna with tapered horn and dielectric lens in horn aperture

Abstract: A lens antenna having high antenna efficiency, low sidelobe levels, and that is easily assembled. The lens antenna includes a first horn made of a metallic conductor, a second horn made of a high-frequency absorbing plastic material, and a lens for controlling the power distribution at an aperature of the horn. Screws may be used to assemble the first horn, the second horn, and the lens. Though some of the microwave signals input through the circular waveguide of the first horn are reflected on the surface of the lens, most of the microwave signals are absorbed by the second horn. Moreover, because no wave absorber is bonded to an inner wall of a conical horn, nothing screens the microwave signal, the power density distribution at the aperture of the lens is not disrupted. Therefore, it is possible to obtain a desired power density distribution.

Communication and tracking antenna systems for satellites

Abstract: A communication and tracking antenna is formed by embedding a tracking patch array in a shaped dual gridded reflector. The reflector includes first and second reflector grids that have orthogonally arranged grid lines and are respectively fed by feed horns. The patch array is positioned so that the first reflector grid is between the patch array and the first feed horn. The first reflector grid thus serves as a filter to remove unwanted polarization components and enhance the quality of both the tracking radiation and the radiation that is reflected from the second reflector grid. In other embodiments, a tracking array is positioned adjacent a reflector's perimeter.

Analysis and design of millimeter wave microstrip reflectarrays

Abstract: The reflectarray combines features of reflector and array antennas. Reflectarrays are illuminated by a feed antenna which excites an array of radiating elements comprising a reflecting surface, and these elements produce a radiated field. Some types of reflectarrays, including the microstrip reflectarray, also produce a specularly reflected field component, as in the case of a reflector antenna. The total field then consists of the radiated field from the patches and the specular reflection. The design and analysis of two millimeter wave microstrip reflectarrays, operating around 27-28 GHz, are discussed. The first design utilises a corrugated conical horn feed and square patch radiating elements to accommodate dual polarisation. The main beam is steered to 25/spl deg/ off broadside in the vertical plane. The second design uses rectangular patches for linear polarization, and a backfire feed which greatly simplifies the feed supporting structure, and a broadside main beam. Measured patterns, gain, and a loss budget are presented and the performance is compared with typical microstrip array antennas. The generation of cross-polarized components of the radiated field is also discussed.

A transform technique for computing the radiation pattern of prime-focal and Cassegrainian reflector antennas

Abstract: An efficient numerical method based on the use of the fast Fourier transform (FFT) algorithm is developed for computing radiation patterns of aperture antennas with given aperture distributions. The method is also readily applicable to the problem of computing the radiation pattern of paraboloidal reflector antennas when the induced surface currents on the surface of the reflector are known. Using an efficient launching and scanning scheme for subreflector analysis, the method is extended to a Cassegrainian reflector antenna system.

Composite antenna feed

Abstract: A composite antenna feed subsystem concentrated in a small area at the prime focus of the parabola of a satellite parabolic reflector accomodates a plurality of frequency bands. The arrays comprising the subsystem are mounted on the top cover of a communication module. A multimode horn is arranged at the center of the subsystem axis which functions at X- and C-band frequencies, and a cross-array consisting of individual elements form the S-band feed, with one arm of the S-band array containing an element mutually shared with the L-band array. Provision is also made for UHF frequencies, and a dipole arrangement for VHF frequencies is arranged around the S-band arms.