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Modified design of sub-reflector with dielectric cylindrical keeper to enhance gain in axially displaced ellipse reflector with dual polarization

Published online by Cambridge University Press:  16 July 2025

AmirHossein Haghparast ,
Pejman Rezaei Open the ORCID record for Pejman Rezaei [Opens in a new window]  and
Ali Zilouchian
AmirHossein Haghparast
Affiliation:
Electrical and Computer Engineering Faculty, Semnan University, Semnan, Iran
Pejman Rezaei*
Affiliation:
Electrical and Computer Engineering Faculty, Semnan University, Semnan, Iran
Ali Zilouchian
Affiliation:
Department of Electrical and Computer Engineering, Florida Atlantic University, Boca Raton, FL, USA
*
Corresponding author: Pejman Rezaei; Email: prezaei@semnan.ac.ir
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Abstract

The study introduces a novel dual-reflector antenna featuring a modified sub-reflector design aimed at improving aperture efficiency. A cylindrical-shaped keeper is introduced to enhance the performance of the sub-reflector. The dual-reflector configuration comprises a main parabolic reflector and a modified sub-reflector, with diameters of 16.5 λ and 2.2 λ, respectively, operating at 5.5 GHz. The antenna demonstrates a bandwidth (BW) of approximately 25.4% (4800–6200 MHz). Experimental measurements indicate favorable characteristics, including low cross-polarization levels (<−25 dB), minimal back lobe levels (F/B > 30 dB), high isolation between ports (>38 dB), and VSWRs less than 1.5:1 for both port1 and port2. The antenna exhibits an efficiency of around 58% and achieves a measured peak gain of approximately 32 dBi within the operating BW.

Keywords

axially displaced ellipse reflector antennacylindrical-shaped keeper designdual polarizationdual-reflector antennahigh gainsub-reflector

Information

Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , First View , pp. 1 - 7
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Copyright
© The Author(s), 2025. Published by Cambridge University Press in association with The European Microwave Association.

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