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Compact beamforming network for producing multiple orthogonal beams in a limited field of view phased array antenna

Published online by Cambridge University Press:  23 June 2023

Elham Sharifi Moghaddam Open the ORCID record for Elham Sharifi Moghaddam [Opens in a new window]  and
Arash Ahmadi Open the ORCID record for Arash Ahmadi [Opens in a new window]
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
*
Corresponding author: Arash Ahmadi; Email: aahmadi@eetd.kntu.ac.ir
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Abstract

Due to the advent of high-throughput communication satellites in a geostationary orbit, the development of multiple beam phased array antenna (MBPAA) technology has become a necessity. This paper presents the design and implementation of the constituent unit of a beamforming network (BFN), which feeds an MBPAA with interleaved sub-arrays. The proposed BFN generates multiple orthogonal sub-beams with a very tiny angular distance between adjacent sub-beams in a limited field of view. The BFN consists of sub-array beamforming networks (SABFNs) with unequal number of beam ports and antenna ports, which can feed both the arrays lateral elements and the interleaved core sub-arrays for pattern shaping and side-lobe level reduction. A microwave circuit for this SABFN has been designed and fabricated in C-band. The microstrip lines have been printed on the two sides of a suspended substrate. This technique leads to size reduction of the circuit by twice a value compared to a conventional microstrip circuit. Measurements have been compared to simulations, and good conformity has been observed. The insertion loss in the path of beam ports to the antenna ports is 3.5 dB for a relative bandwidth of 10%.

Keywords

beam forming networkhigh-throughput satteliteinterleaved sub-arraymultiple beamphased array antennasuspended substrate
Type
Passive Components and Circuits
Information
International Journal of Microwave and Wireless Technologies , Volume 15 , Special Issue 10: JNM 2022 Special Issue , December 2023 , pp. 1662 - 1675
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Copyright
© The Author(s), 2023. Published by Cambridge University Press in association with the European Microwave Association

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