How do antennas convert current into electromagnetic waves?

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SUMMARY

Antenna technology relies on the principle that alternating current (AC) in a conducting rod generates an electromagnetic field, which propagates into space as electromagnetic waves. This process occurs due to the oscillation of electric charges, creating an alternating electromagnetic field. Conversely, when electromagnetic waves encounter a receiving antenna, they induce an electric current within the antenna, effectively converting the waves back into electrical signals. This fundamental mechanism underpins various technologies, including electromagnets and transformers.

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  • Understanding of alternating current (AC) principles
  • Basic knowledge of electromagnetic fields
  • Familiarity with antenna design and function
  • Concept of electromagnetic induction
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  • Explore antenna design techniques for optimal performance
  • Learn about the interaction between electromagnetic waves and materials
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Electronics engineers, telecommunications professionals, and students studying electromagnetic theory will benefit from this discussion on antenna functionality and its applications.

ASidd
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How exactly does an antenna work?

When Alternating current is produced into the conducting rod why does it propagate into space as electromagnetic waves or in other words what causes the current to leave the antenna?

Also when electromagnetic waves interact with a receiving antenna what exactly happens that changes them back into current?

If someone could give me links to some resources; it would be greatly appreciated.

Thanks
 
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Current flowing through a wire creates an electromagnetic field around it; an alternating electric current creates an alternating electromagnetic field.

Similarly, a wire put in an alternating electromagnetic field will have an induced electric current within it. Thus, antennas are born and a lot of other technologies are enabled as well like electromagnets and transformers.

Ever tried a google search?
http://en.wikipedia.org/wiki/Antenna_(electronics )
 
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