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High gain and circularly polarized beam-switching 8 × 8 Vivaldi antenna array for X-band application

Published online by Cambridge University Press:  27 July 2022

Tohid Aribi Open the ORCID record for Tohid Aribi [Opens in a new window] ,
Tohid Sedghi Open the ORCID record for Tohid Sedghi [Opens in a new window]  and
Reza Khajeh Mohammad Lou
Tohid Aribi
Affiliation:
Department of Electrical Engineering, Miandoab Branch, Islamic Azad University, Miandoab, Iran Microwave and Antenna Research Center, Urmia Branch, Islamic Azad University, Urmia, Iran
Tohid Sedghi*
Affiliation:
Microwave and Antenna Research Center, Urmia Branch, Islamic Azad University, Urmia, Iran Department of Electrical Engineering, Urmia Branch, Islamic Azad University, Urmia, Iran
Reza Khajeh Mohammad Lou
Affiliation:
Department of Electrical Engineering, Miandoab Branch, Islamic Azad University, Miandoab, Iran Microwave and Antenna Research Center, Urmia Branch, Islamic Azad University, Urmia, Iran
*
Author for correspondence: Tohid Sedghi, E-mail: sedghi.tohid@gmail.com
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Abstract

An 8 × 8 butler Vivaldi beam-steering antenna array is introduced for X-band application. Circularly polarized array is made of eight Vivaldi elements with 1×8 platform and an 8×8 beam feeding network. Vivaldi radiating element is used in array form to enhance impedance bandwidth and overall efficiency such as gain. Using microwave passive components, for instance, 3 dB branch line couplers and crossover help to have orthogonal modes for feeding each of the elements, hence circular polarization property is achieved. Extracted results show that the array has an impedance bandwidth over 7–12.7 GHz (~58%) for VSWR≤2 and an axial-ratio bandwidth of 3.15 GHz that is between 8.15 and 11.3 GHz (~33%). The peak gain of antenna array is 18 dBi at 10 GHz. The proposed beam-steering antenna with compact size and good operation is capable to cover an angle range from −42 to 55 degree in whole operation frequency.

Keywords

Axial ratiobeam-steering networkbutler matrixmicrostrip
Type
Antenna Design, Modeling and Measurements
Information
International Journal of Microwave and Wireless Technologies , Volume 15 , Issue 5 , June 2023 , pp. 836 - 842
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Copyright
© The Author(s), 2022. Published by Cambridge University Press in association with the European Microwave Association

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