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Theoretical Consideration of Axial Ratio Deterioration in CP Loop-Shaped Antennas

Hisamatsu Nakano Orcid Logo, Tomoki Abe Orcid Logo, Amit Mehta Orcid Logo, Junji Yamauchi Orcid Logo

IEEE Antennas and Wireless Propagation Letters, Volume: 22, Issue: 5, Pages: 1035 - 1039

Swansea University Author: Amit Mehta Orcid Logo

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DOI (Published version): 10.1109/lawp.2022.3231615

Abstract

Conventionally, the deterioration in the axial ratio (AR) for a circularly polarized antenna based on a traveling wave current is explained using backward currents reflected from the antenna arm end. This letter reveals the existence of a new cause for AR deterioration in a situation of no backward...

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Published in: IEEE Antennas and Wireless Propagation Letters
ISSN: 1536-1225 1548-5757
Published: Institute of Electrical and Electronics Engineers (IEEE) 2023
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URI: https://cronfa.swan.ac.uk/Record/cronfa62451
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first_indexed 2023-01-26T12:01:09Z
last_indexed 2023-02-14T04:16:27Z
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spelling v2 62451 2023-01-26 Theoretical Consideration of Axial Ratio Deterioration in CP Loop-Shaped Antennas 8a1e5679707cf437cbfd17b72514b8a5 0000-0001-8073-2436 Amit Mehta Amit Mehta true false 2023-01-26 EEEG Conventionally, the deterioration in the axial ratio (AR) for a circularly polarized antenna based on a traveling wave current is explained using backward currents reflected from the antenna arm end. This letter reveals the existence of a new cause for AR deterioration in a situation of no backward currents. For this, a theoretical loop antenna model of one-guided wavelength circumference is constructed, where only a forward traveling wave current (a positive s '-directed current) flows with attenuation due to the radiation. The derived AR equation finds that the AR deteriorates due to the attenuation of the current, even when backward currents do not exist. Subsequently, a current that flows in the direction normal to the positive s '-directed current (a t '-directed current specified by perturbation weight p ) is added to the loop. It is found that the AR in the presence of the attenuating current is improved by virtue of the positive t '-directed current. Journal Article IEEE Antennas and Wireless Propagation Letters 22 5 1035 1039 Institute of Electrical and Electronics Engineers (IEEE) 1536-1225 1548-5757 Attenuation constant, axial ratio, circularly polarized radiation, forward current, perturbation length, traveling wave current 5 5 2023 2023-05-05 10.1109/lawp.2022.3231615 http://dx.doi.org/10.1109/lawp.2022.3231615 COLLEGE NANME Electronic and Electrical Engineering COLLEGE CODE EEEG Swansea University 2023-06-12T14:42:50.5372783 2023-01-26T11:56:15.0746453 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Electronic and Electrical Engineering Hisamatsu Nakano 0000-0002-5559-1771 1 Tomoki Abe 0000-0003-2546-1797 2 Amit Mehta 0000-0001-8073-2436 3 Junji Yamauchi 0000-0002-1263-1913 4 62451__26569__348482046d584e148fa5dfe2af70c636.pdf 62451.pdf 2023-02-13T09:31:04.9024332 Output 441058 application/pdf Accepted Manuscript true true eng
title Theoretical Consideration of Axial Ratio Deterioration in CP Loop-Shaped Antennas
spellingShingle Theoretical Consideration of Axial Ratio Deterioration in CP Loop-Shaped Antennas
Amit Mehta
title_short Theoretical Consideration of Axial Ratio Deterioration in CP Loop-Shaped Antennas
title_full Theoretical Consideration of Axial Ratio Deterioration in CP Loop-Shaped Antennas
title_fullStr Theoretical Consideration of Axial Ratio Deterioration in CP Loop-Shaped Antennas
title_full_unstemmed Theoretical Consideration of Axial Ratio Deterioration in CP Loop-Shaped Antennas
title_sort Theoretical Consideration of Axial Ratio Deterioration in CP Loop-Shaped Antennas
author_id_str_mv 8a1e5679707cf437cbfd17b72514b8a5
author_id_fullname_str_mv 8a1e5679707cf437cbfd17b72514b8a5_***_Amit Mehta
author Amit Mehta
author2 Hisamatsu Nakano
Tomoki Abe
Amit Mehta
Junji Yamauchi
format Journal article
container_title IEEE Antennas and Wireless Propagation Letters
container_volume 22
container_issue 5
container_start_page 1035
publishDate 2023
institution Swansea University
issn 1536-1225
1548-5757
doi_str_mv 10.1109/lawp.2022.3231615
publisher Institute of Electrical and Electronics Engineers (IEEE)
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Electronic and Electrical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Electronic and Electrical Engineering
url http://dx.doi.org/10.1109/lawp.2022.3231615
document_store_str 1
active_str 0
description Conventionally, the deterioration in the axial ratio (AR) for a circularly polarized antenna based on a traveling wave current is explained using backward currents reflected from the antenna arm end. This letter reveals the existence of a new cause for AR deterioration in a situation of no backward currents. For this, a theoretical loop antenna model of one-guided wavelength circumference is constructed, where only a forward traveling wave current (a positive s '-directed current) flows with attenuation due to the radiation. The derived AR equation finds that the AR deteriorates due to the attenuation of the current, even when backward currents do not exist. Subsequently, a current that flows in the direction normal to the positive s '-directed current (a t '-directed current specified by perturbation weight p ) is added to the loop. It is found that the AR in the presence of the attenuating current is improved by virtue of the positive t '-directed current.
published_date 2023-05-05T14:42:49Z
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score 11.035634

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