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Azimuth Angle Estimation for a Reduced Radiation Region Formed by a Metaspiral Antenna

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

IEEE Access, Volume: 7, Pages: 78289 - 78297

Swansea University Author: Amit Mehta Orcid Logo

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DOI (Published version): 10.1109/ACCESS.2019.2921452

Abstract

A two-arm metaspiral antenna is presented, where the feeding voltage sources are expressed using excitation amplitude r and deviation angle δ . This excitation is decomposed into the odd mode and even mode components. The odd mode component forms a circularly polarized (CP) axial beam and the even m...

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Published in: IEEE Access
ISSN: 2169-3536
Published: 2019
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa51089
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Abstract: A two-arm metaspiral antenna is presented, where the feeding voltage sources are expressed using excitation amplitude r and deviation angle δ . This excitation is decomposed into the odd mode and even mode components. The odd mode component forms a circularly polarized (CP) axial beam and the even mode component forms a CP conical beam, whose maximum intensity is off the antenna axis. Superimposing the conical beam onto the axial beam forms a reduced radiation region in the elevation plane. The reduced radiation region is used for minimizing transmission in a particular ϕFBD direction or the rejection of interference signals from the ϕFBD direction. This paper presents a formula that estimates the azimuth angle of the reduced radiation region. The formula features the excitation mode ratio, m , and the mode phase difference, ΔΦ . The formulated azimuth angle is validated by showing good agreement with the simulated azimuth angle obtained by searching for a null over the 3D radiation pattern. The formula is simple and hence supersedes the time-consuming 3D null search.
College: Faculty of Science and Engineering
Start Page: 78289
End Page: 78297

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