A radiator element for active phased array antenna

Abstract

This paper is concerned with selection and design of an antenna element of a phased array antenna for 20 GHz communications satellite. For this purpose, a new type of dual‐mode horn with inner choke ring at the excitation region is proposed. Also, measured results compared with predicted data for the dual‐mode horn radiator with a circular polarizer are presented. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2393–2395, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21971

A Circularly Polarized Conical Horn with an Inserted Metallic Cone-Sphere [Antenna Designer's Notebook]

“…Furthermore, to the best of the authors' knowledge, an analysis of a dielectrically loaded circularly polarized conical horn was not available in the open literature, and so this is believed to be the first paper dedicated to this topic. It is believed that the circularly polarized horn with inserted cone-sphere could find wide potential applications in modern satellite communication systems [6,10], and as a feed for reflector antennas [11,19]. …”

“…While the horn antenna is basically linearly polarized, it can be turned into a circularly polarized antenna by using a suit able polarizer [4][5][6][7]. The circularly polarized (CP) conical horn is preferred in polarization-diversity and satellite communica tion systems, and as such, has received substantial attention 146 [7][8][9][10]. While the polarizer is primarily responsible for wave polarization, the overall performance of the circularly polarized horn can be improved by a number of conventional techniques.…”

“…While the polarizer is primarily responsible for wave polarization, the overall performance of the circularly polarized horn can be improved by a number of conventional techniques. These include the use of a lossy magnetic-material coating [8], dielectric loading [11,12], aperture matching [13,14], multimoding, and corrugating [10]. In general, these methods increase the weight and the fabrication cost of the horn, and result in increased losses (due to lossy magnetic-and dielectric material loading).…”

“…In this context, insertion of a cone-sphere appears to be a better technique for improving the performance of a linearly polarized short horn than dielectric loading . In this paper, the objective is to extend the idea in [IS-18] to circularly polarized short horns, considering the increased demand for simple, compact, low-cost and high performance circularly polarized conical horns [6][7][8][9][10]19]. The performance of a circularly polarized short horn with an inserted metallic cone-sphere is systematically compared with the performance of a dielectrically loaded circularly polarized horn.…”