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Cassegrain antenna

About: Cassegrain antenna is a research topic. Over the lifetime, 3207 publications have been published within this topic receiving 28278 citations.


Papers
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Proceedings ArticleDOI
01 Feb 1997
TL;DR: The SEPTUM-Polarizer, equalized, choked (SPEC) feed element as mentioned in this paper is an antenna feed element that consists of a low axial-ratio circular-waveguide septum polarizer and a conical horn with a single choke/corrugation at the aperture.
Abstract: Antenna feed element performance is critical in obtaining low circular cross-polarization in multi-element feed arrays. The antenna feed element described in detail in this paper has been named the septum-polarizer, equalized, choked (SPEC) feed element. It consists of a low axial-ratio circular-waveguide septum polarizer and a conical horn with a single choke/corrugation at the aperture. This produces circularly symmetric, equalized E- and H-plane element patterns with low on-axis and off-axis axial ratios. Breadboard models of the SPEC feed element have been developed and measured results are provided. A flight hardware version of this feed element is being developed for satellite applications. These applications are for large antenna feed arrays that illuminate offset parabolic reflectors. In order to meet the low weight requirements, the flight SPEC feed elements will be constructed of carbon-cyanate-ester with electroless copper plating applied to the internal surfaces.

11 citations

Proceedings Article
10 Mar 2008
TL;DR: An overlapping feed concept for a multiple feed per beam (MFB) antenna architecture is considered and the characteristics of the farfield pattern are less appropriate for the required performance.
Abstract: An overlapping feed concept for a multiple feed per beam (MFB) antenna architecture is considered. As a first realization a space fed array configuration is focused within this paper. A demonstrator model consisting of a primary and a secondary antenna array was manufactured. The measurement results are in good agreement with the simulation results. Although, the characteristics of the farfield pattern are less appropriate for the required performance. Alternative solutions will be investigated in the future.

11 citations

Patent
07 Apr 1977
TL;DR: The cassegrain antenna consists of a main reflector and a salient primary radiator pref. in the form of a horn radiator with a second reflector before it, held by a plastic hood surrounding the primary radiator as mentioned in this paper.
Abstract: The cassegrain antenna consists of a main reflector and a salient primary radiator pref. in the form of a horn radiator with a second reflector before it, held by a plastic hood surrounding the primary radiator. The plastic hood (7) has the shape of a bottle or pot whose bottom (8) is shaped like the second reflector. It is provided with a metallised layer (9), so that the reflector consisting of the metallised layer (9) and the plastic hood (7) forms a constructional unit. This unit is mounted at the open end of the plastic hood (6).

11 citations

Journal ArticleDOI
TL;DR: In this paper, a dual-band half-wave plate mirror antenna is proposed for radar systems. But the most difficult part of the design is the 90-deg polarization rotating mirror (halfwave plate).
Abstract: The mirror antenna, sometimes called an inverse Cassegrain antenna, is used in modern radar systems where efficient wide angle scan is required in combination with light weight and small size. Although previous applications have been single band, an additional advantage of the mirror antenna is that it is practical to implement dual-band configurations which can greatly enhance the capability of radar or other radiating systems. The most difficult part of a dual-band mirror antenna design is the 90\deg polarization rotating mirror (half-wave plate). The challenge is to achieve effective performance at two bands and maintain that performance over a wide range of aspect angle. Basic mirror antenna operation and design and fabrication techniques for a dual-band half-wave plate mirror are described. The solution for design parameters is derived for perfect 90\deg polarization rotation at a given aspect angle for each of the two bands. The design approach includes a process for optimizing the design for the full desired range of aspect angles. Practical fabrication considerations are discussed along with inclusion of the effects of capacitive susceptance of a protective mirror coating in the design theory. Theoretical performance is compared with measurements of mirror samples.

11 citations

Journal ArticleDOI
TL;DR: In this article, a paraboloidal reflector, offset fed with a corrugated conical horn, was examined as a possible antenna for use in millimeter wave communications systems when minimization of interference is an important consideration.
Abstract: A paraboloidal reflector, offset fed with a corrugated conical horn, has been examined as a possible antenna for use in millimeter wave communications systems when minimization of interference is an important consideration. Low far-out and back-lobe radiation were primary objectives. Experimentally obtained data, representative of performance at 37 GHz, is presented. When appropriately shielded to limit spillover, levels more than 75 dB below the main beam maximum have been obtained in the far-out and back-lobe regions.

11 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202318
202267
202111
202018
201920
201824