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- W4368368716 abstract "Abstract We investigate dipoles generated by electric current line (TM), electric loop (TE), and mechanically spinning of electret and magnet. While far-zone |HE| of the TE and TM dipole are identical, their near-zone behaviors are drastically different. We present closed form expressions of the Ohmic loss in a spherical lossy shell (SLS) for the first time, which leads to accurate computations and discussions of the article. For electrically small dipole of normalized half dipole-length |ka| ≪1, analytic results show that the radiation efficiency ηr is proportional to |ka| 3 for TM dipole, and |ka| for TE dipole, respectively. Consequently, ηr of TE can be better than TM in two to three orders of magnitude for under seawater communication. The time-domain energy flow velocity (EFV) pattern shows that TM dipole in lossy media is cavity-dominating, while TE/TM in lossless and TE in lossy medium are all radiation-dominating. Numerical results reveal that mechanically spinning dipole is smaller in size and weight but it requires more operation power, compared to its electromagnetic counter-partners. Finally, design, tuning and impedance matching of low-profile TE dipole antenna are outlined." @default.
- W4368368716 created "2023-05-05" @default.
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- W4368368716 date "2023-05-04" @default.
- W4368368716 modified "2023-10-14" @default.
- W4368368716 title "Comparative Study of Multi-Physics Generated Small Dipoles in Conducting Media" @default.
- W4368368716 doi "https://doi.org/10.21203/rs.3.rs-2851923/v1" @default.
- W4368368716 hasPublicationYear "2023" @default.
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