A question about the phase of pump wave of a dipole and radiation of the dipole

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SUMMARY

The discussion centers on the phase relationship between the pump wave and the radiation emitted by a dipole antenna. It is established that while the current and voltage on a dipole are approximately in quadrature, they are not perfectly aligned. At resonance, the dipole exhibits a radiation resistance of approximately 72Ω, which represents the load presented by free space to the transmitter. Additionally, in free space, the ratio of fields that are in phase corresponds to a resistance of about 377Ω.

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  • Basic grasp of resonance in electrical circuits
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Electrical engineers, RF engineers, and students studying antenna design and electromagnetic theory will benefit from this discussion.

majunge000
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When I am dealing with dipole radiation, I faces a difficult problem. Is the phase of the radiation the same as pump wave?
 
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I look at it this way. The current and voltage on a dipole are in about quadrature, but not exactly. At resonance, when the reactive impedances cancel, there is a resistance of about 72Ω (an in-phase component) which we call the radiation resistance and this represents the 'load' which free space presents to the transmitter, 'transformed' by the action of the dipole. In free space, the actual ratio of fields, which are in phase, is equivalent to a resistance of about 377Ω.
 

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