Angular momentum of a rotating dipole
In this paper, we derive the far field electromagnetic fields of a rotating half-wave dipole antenna. Theoretically, we have demonstrated that the far electromagnetic fields of a rotating half-wave dipole carry angular momentum in the term of φ-φ′, which is absent from the stationary half-wave dipol...
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| Main Authors: | , |
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| Format: | Article |
| Published: |
Universiti Teknikal Malaysia Melaka
2014
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| Subjects: | |
| Online Access: | http://eprints.utm.my/id/eprint/51866/ http://journal.utem.edu.my/index.php/jtec/article/view/454 |
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| Institution: | Universiti Teknologi Malaysia |
| Summary: | In this paper, we derive the far field electromagnetic fields of a rotating half-wave dipole antenna. Theoretically, we have demonstrated that the far electromagnetic fields of a rotating half-wave dipole carry angular momentum in the term of φ-φ′, which is absent from the stationary half-wave dipole antenna. The term sin(κr -ωt + [φ -φ′]) tells us that the electromagnetic wave propagates outward with the speed of light c (evidence from k = ω/c) from the dipole along the r axis and both electric and magnetic fields are spinning (oscillate with ω rad/s) and orbiting (rotating with ω0 rad/s) along the r axis with the speed of light. The orbital frequency is evidence from the term φ -φ ′ =ω 0t -ω 0t' =ω 0r /c · |
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