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Synthesis technique of a low-profile multiple sub-beam phased array antenna for high-throughput satellite applications

Published online by Cambridge University Press:  06 November 2020

Elham Sharifi Moghaddam Open the ORCID record for Elham Sharifi Moghaddam [Opens in a new window]  and
Arash Ahmadi
Elham Sharifi Moghaddam
Affiliation:
Faculty of Electrical Engineering, K. N. Toosi University of Technology, Tehran, Iran
Arash Ahmadi*
Affiliation:
Faculty of Electrical Engineering, K. N. Toosi University of Technology, Tehran, Iran
*
Author for correspondence: Arash Ahmadi, E-mail: aahmadi@eetd.kntu.ac.ir
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Abstract

Sub-beam concept is very useful for size reduction of multiple beam phased array antenna (PAA) systems that are applied for high-throughput communication satellites. In this paper, the synthesis procedure for a PAA with multiple sub-beams in two dimensions of the coverage domain is proposed and analyzed. In the design procedure, the interleaved sub-arraying technique has been applied to eliminate the grating lobes. The extremely short angular distance between adjacent sub-beams is challenging. An innovative beam forming network is proposed, which can generate multiple orthogonal sub-beams while keeping the required angular distance between sub-beams. To demonstrate the effectiveness of the design technique, an example considering the requirements derived from conceptual design of a high-throughput communication payload is presented. The array is optimized using the genetic algorithm while taking into account the technical requirements of the antenna. The gain patterns exhibit a 0.4° angular distance between adjacent sub-beams. In addition, the number of sub-arrays and element spacing guarantee the orthogonality of the sub-beams. The calculated carrier to interference ratio in the synthesized array shows that it has acceptable values in each spot. The aperture size reduction in the synthesized array compared to a conventional multiple beam array is more than 36.7%.

Keywords

Beam forming networkGenetic algorithmHigh throughput satelliteInterleaved sub-arraysMultiple beamPhased array antennaSub-beam
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , Volume 13 , Issue 9 , November 2021 , pp. 897 - 914
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Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press in association with the European Microwave Association

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