Removal of Beam Squinting Effects in a Circularly Polarized Offset Parabolic Reflector Antenna Using a Matched Feed

Abstract

Abstract-This paper presents the design of a tri-mode matched feed horn to remove the beam squinting effects in a circularly polarized offset parabolic reflector antenna. In a conical horn, three modes i.e., TE 11 , TM 11 and TE 21 are combined in proper amplitude and phase proportion to obtain a tri-mode matched feed configuration. The proposed tri-mode horn is then used as a primary feed device to illuminate the circularly polarized offset parabolic reflector antenna. The simulated data on radiation characteristics of the offset reflector are used to estimate the magnitude of beam squinting and the results are compared with that of a conventional potter horn fed offset reflector. The experimental results on secondary radiation pattern are also incorporated in the paper.

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]. …”

“…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.…”

Design of Dual Offset Shaped Reflector Antenna Based on Degl Algorithm

“…Contoured Beam Reflector Antenna (CBRA) plays an important role in the satellite communication system [1,2]. The radiation patterns of CBRA can cover the shape of the required coverage region on the earth with the desired directivity.…”

Improving the Beam Efficiency of an Offset Parabolic Reflector Antenna for Spaceborne Radiometric Applications

“…However, very little information regarding the design of matched feed is found in [10]. Recently, the authors have carried out very specific investigations on the design and development on the matched feed, and reported its performance with a circularly polarized offset parabolic reflector antenna [11]. Tri-mode matched feed uses a higher order TE 21 mode and a TM 11 mode with a fundamental TE 11 mode to compensate the cross polarization introduced by the offset geometry.…”