Multi-Physics Generated Small Dipoles in Lossy Media

Pan, George; Zhu, Sai

doi:10.1109/apusncursinrsm.2018.8608207

Cited by 2 publications

(1 citation statement)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the paper, more attention is paid to the magnetic dipole because of its better performance and rear appearance in the literature. Magnetic current based antennas (MCA) are less popular than electric counterpartners by far [21][22][23][24][25]. The contra-wound toroidal helix antenna (CTHA) was studied numerically and experimentally at the VHF band [22,23].…”

Section: Introductionmentioning

confidence: 99%

Comparative study of multi-physics generated small dipoles in conducting media

Zhou

Pan

2023

J Comput Electron

Self Cite

View full text Add to dashboard Cite

We investigate dipoles generated by electric current line (TM), electric loop (TE), and mechanically spinning of electret and magnet. While far-zone | E H | 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.

show abstract

Section: Introductionmentioning

confidence: 99%

Comparative study of multi-physics generated small dipoles in conducting media

Zhou

Pan

2023

J Comput Electron

Self Cite

View full text Add to dashboard Cite

show abstract

Comparative Study of Multi-Physics Generated Small Dipoles in Conducting Media

Zhou

Pan

2023

Preprint

View full text Add to dashboard Cite

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.

show abstract

Multi-Physics Generated Small Dipoles in Lossy Media

Cited by 2 publications

References 8 publications

Comparative study of multi-physics generated small dipoles in conducting media

Comparative study of multi-physics generated small dipoles in conducting media

Comparative Study of Multi-Physics Generated Small Dipoles in Conducting Media

Contact Info

Product

Resources

About