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首页> 外文期刊>Applied Computational Electromagnetics Society journal >The Spatial Distributions of Radiation Emitted from a Sinusoidal Current Filament and a Dipole Antenna
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The Spatial Distributions of Radiation Emitted from a Sinusoidal Current Filament and a Dipole Antenna

机译：The Spatial Distributions of Radiation Emitted from a Sinusoidal Current Filament and a Dipole Antenna

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摘要

While the analytical and numerical tools fordetermining the basic properties of a variety of antennatypes have been long-established, there remains somecontinuing curiosity about how electromagnetic radiationis launched by such a simple antenna as a dipole.The following article discusses this problem in both thefrequency domain and time domain. The sinusoidal currentfilament (SCF) is investigated first as a prototype ofa wire dipole. The length-wise distribution of radiatedpower for the SCF is obtained from the distributed radiationresistance of Schelkunoff and Feldman, the inducedelectromotive force (IEMF) method, and the far-fieldanalysis of radiation sources (FARS) developed by theauthor.The FARS approach is next used to analyze afrequency-domain numerical model of a dipole antenna,producing results similar to those for the SCF for a dipoleof near-zero radius. Differentiating the decaying onsurfacePoynting vector (PV) produces results comparableto those from FARS to explicitly demonstrate thepower loss caused by radiation of the propagating currentand charge. The lobed distributed radiated poweris shown to be closely correlated with the square of thedipole current, confirming the cause of the radiation tobe due to a partially reflected charge as the current andcharge form standing waves on the dipole. Applicationof a time-domain version of FARS yields a smoothedlength-wise distribution of radiated energy as opposedto the lobed variation of the frequency domain.

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