VLF Near-Field Excited by an Arbitrarily Oriented Electric Dipole in a Magnetized Plasma
Since the orientation of a very low frequency (VLF: 3–30 kHz) space-borne antenna relative to the geomagnetic field will change with the satellite orbiting around the earth, precisely computing the near-field excited by an arbitrarily oriented radiator in the ionosphere is of great import...
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doaj-edb711b44357473fb74c3dcb0c22f05d2021-06-02T23:19:04ZengIEEEIEEE Access2169-35362021-01-019789027891410.1109/ACCESS.2021.30837439440967VLF Near-Field Excited by an Arbitrarily Oriented Electric Dipole in a Magnetized PlasmaTong He0https://orcid.org/0000-0001-5867-1323Hui Ran Zeng1https://orcid.org/0000-0003-1379-4092Kai Li2https://orcid.org/0000-0003-2614-0282Zhejiang Laboratory, Research Center for Intelligent Networks, Zhejiang, ChinaCollege of Information Science and Electronic Engineering, Zhejiang University, Zhejiang, ChinaCollege of Information Science and Electronic Engineering, Zhejiang University, Zhejiang, ChinaSince the orientation of a very low frequency (VLF: 3–30 kHz) space-borne antenna relative to the geomagnetic field will change with the satellite orbiting around the earth, precisely computing the near-field excited by an arbitrarily oriented radiator in the ionosphere is of great importance to the antenna analysis in realistic VLF space-borne applications. In this paper, we propose a semi-analytical method for evaluating the near-field of a VLF electric dipole of arbitrary orientation in a magnetized plasma, where the arbitrarily oriented dipole is modeled as the superposition of dipoles parallel and perpendicular to the magnetic field. The near-field in this case consists of the contributions of both the ordinary wave (O-wave) and the extraordinary wave (E-wave). Due to its large attenuation rate, the integral for the O-wave can be directly estimated through numerical integration, while the integral for the E-wave is evaluated with the help of speed-up convergence algorithm and the complex variable theory. Computations show that the O-wave still has comparable amplitudes with the E-wave in the near zone, and the field generated by the dipole perpendicular to the magnetic field is of dominant effects. Moreover, it is found that there exists remarkable “aggregation effect” in the radiation pattern of the E-wave, indicating that the propagable mode in the magnetized plasma propagates mainly along the direction of the magnetic field.https://ieeexplore.ieee.org/document/9440967/Arbitrarily oriented electric dipolemagnetized plasmanear-fieldvery low frequency electromagnetic wave |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Tong He Hui Ran Zeng Kai Li |
spellingShingle |
Tong He Hui Ran Zeng Kai Li VLF Near-Field Excited by an Arbitrarily Oriented Electric Dipole in a Magnetized Plasma IEEE Access Arbitrarily oriented electric dipole magnetized plasma near-field very low frequency electromagnetic wave |
author_facet |
Tong He Hui Ran Zeng Kai Li |
author_sort |
Tong He |
title |
VLF Near-Field Excited by an Arbitrarily Oriented Electric Dipole in a Magnetized Plasma |
title_short |
VLF Near-Field Excited by an Arbitrarily Oriented Electric Dipole in a Magnetized Plasma |
title_full |
VLF Near-Field Excited by an Arbitrarily Oriented Electric Dipole in a Magnetized Plasma |
title_fullStr |
VLF Near-Field Excited by an Arbitrarily Oriented Electric Dipole in a Magnetized Plasma |
title_full_unstemmed |
VLF Near-Field Excited by an Arbitrarily Oriented Electric Dipole in a Magnetized Plasma |
title_sort |
vlf near-field excited by an arbitrarily oriented electric dipole in a magnetized plasma |
publisher |
IEEE |
series |
IEEE Access |
issn |
2169-3536 |
publishDate |
2021-01-01 |
description |
Since the orientation of a very low frequency (VLF: 3–30 kHz) space-borne antenna relative to the geomagnetic field will change with the satellite orbiting around the earth, precisely computing the near-field excited by an arbitrarily oriented radiator in the ionosphere is of great importance to the antenna analysis in realistic VLF space-borne applications. In this paper, we propose a semi-analytical method for evaluating the near-field of a VLF electric dipole of arbitrary orientation in a magnetized plasma, where the arbitrarily oriented dipole is modeled as the superposition of dipoles parallel and perpendicular to the magnetic field. The near-field in this case consists of the contributions of both the ordinary wave (O-wave) and the extraordinary wave (E-wave). Due to its large attenuation rate, the integral for the O-wave can be directly estimated through numerical integration, while the integral for the E-wave is evaluated with the help of speed-up convergence algorithm and the complex variable theory. Computations show that the O-wave still has comparable amplitudes with the E-wave in the near zone, and the field generated by the dipole perpendicular to the magnetic field is of dominant effects. Moreover, it is found that there exists remarkable “aggregation effect” in the radiation pattern of the E-wave, indicating that the propagable mode in the magnetized plasma propagates mainly along the direction of the magnetic field. |
topic |
Arbitrarily oriented electric dipole magnetized plasma near-field very low frequency electromagnetic wave |
url |
https://ieeexplore.ieee.org/document/9440967/ |
work_keys_str_mv |
AT tonghe vlfnearfieldexcitedbyanarbitrarilyorientedelectricdipoleinamagnetizedplasma AT huiranzeng vlfnearfieldexcitedbyanarbitrarilyorientedelectricdipoleinamagnetizedplasma AT kaili vlfnearfieldexcitedbyanarbitrarilyorientedelectricdipoleinamagnetizedplasma |
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