The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A dual X/Ka-band feed system suitable for large Earth Station SATCOM antennas has been developed. The feed system is suitable for simultaneous four-port operation over both X- and Ka-band and supports monopulse tracking at Ka-band. Secondary radiation patterns on a representative 13m class reflector have been calculated and compared with the requirements for WGS.
Increasing requirements in radio astronomy for wide band observing, highly compact feed systems, and remote telescope operation are stretching the capability of traditional horn antenna and feed system designs. Here we describe the development of some new types of feed system for Australian and overseas radio telescopes designed to meet these requirements. The feeds systems described are 4 to 12.25...
A strategy to optimize dual-reflector antennas for compact Satellite Communications (SATCOM) terminals to meet various user-specified requirements is described. An overview of the method and design methodology is given, and some of the challenges in designing compact antennas as compared to traditional large Earth Station antennas are described.
A compact horn was developed for the Parkes radio telescope in order to perform radio astronomy experiments on the neutral atomic hydrogen (H) spectral line and the hydroxyl radical (OH) molecular lines. The need to integrate to existing equipment and for compactness made the design of an efficient system complex.
A compact, on the move, SATCOM terminal for the military Ka-band has been successfully designed, implemented and tested. It allows two-way communications at Ka-band while the vehicle is in motion over rough terrains. A compact, complex, tracking system ensures that the antenna keeps pointing at the satellite while the vehicle is on the move.
The theoretical design of a simultaneous S/Ka feed system has been undertaken to see if such a feed system could be used for remote sensing applications. The tracking requirements at both S and Ka bands are met by the use of a TE21 tracking coupler.
A simultaneous X/Ka feed system has been designed to cater for reflector antennas with a F/D ratio of 0.8. This work is an extension of the successful design of the initial X/Ka feed system that was designed for reflectors with a F/D ratio of 0.65. Although simple in concept, this move from F/D=0.65 to F/D=0.8 is not an easy task from a design point of view.
The Nyström method is a higher-order numerical method for solving a wide range of integral equations. While “Locally Corrected” Nyström methods can be developed for general integral equations in electromagnetism, the simpler Nyström method itself cannot be easily applied, except in particular cases. Here we present a heuristic approach to the solution of a volume integral equation for dielectric...
As a risk mitigation exercise, a new X-band feed-pallet and feed horn for an existing military SATCOM terminal was designed. Through the use of an optimized horn design, and redesign of the feed network components, an improved design was obtained. The new feed system is more compact, has reduced weight, and is mechanically simpler than the existing feed pallet.
The performance of an optimized corrugated horn is compared with that of an optimized smooth-walled spline-profile horn for the 31-3-45 GHz band for ALMA.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.