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

In summary, the question is whether the phase of the radiation is the same as the pump wave in dipole radiation. The current and voltage on a dipole are not exactly in quadrature, but at resonance, the reactive impedances cancel and there is a resistance of 72Ω which is called the radiation resistance. This represents the "load" of free space on the transmitter, transformed by the dipole. In free space, the ratio of fields, which are in phase, is equivalent to a resistance of 377Ω.
  • #1
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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  • #2
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.
 

1. What is the phase of the pump wave in relation to the radiation of a dipole?

The phase of the pump wave refers to the position of the wave in its cycle at a given point in time. In relation to the radiation of a dipole, the phase of the pump wave determines the strength and direction of the radiation emitted by the dipole.

2. How does the phase of the pump wave affect the radiation pattern of a dipole?

The phase of the pump wave plays a crucial role in determining the radiation pattern of a dipole. It can either enhance or cancel out certain directions of radiation, resulting in a complex pattern of radiation depending on the phase of the pump wave.

3. Can the phase of the pump wave be manipulated to control the radiation pattern of a dipole?

Yes, the phase of the pump wave can be controlled by adjusting the timing and amplitude of the pump wave. By doing so, the radiation pattern of a dipole can be altered, allowing for targeted radiation in specific directions.

4. How does the distance between the dipole and the pump wave source impact the phase of the pump wave?

The distance between the dipole and the pump wave source affects the phase of the pump wave through a phenomenon called phase delay. As the pump wave travels through space, it experiences a delay in phase, which can impact the radiation pattern of the dipole.

5. What is the significance of understanding the phase of the pump wave in relation to dipole radiation?

Understanding the phase of the pump wave is crucial for controlling and manipulating the radiation pattern of a dipole. This knowledge is essential in various applications such as antenna design, wireless communication, and medical imaging, where precise control of radiation direction is needed.

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