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  Topic: different types of grounding..
fisico32

Replies: 0
Views: 6730

PostForum: Questions Related to Antenna Theory   Posted: Sat Oct 01, 2011 11:16 pm   Subject: different types of grounding..
Hello Forum,
I am a little confused about grounding.

Here my dilemmas:
1) Let's consider a simple DC circuit with a constant voltage source and a bunch of resistors connected in a certain configu ...
  Topic: antenna reactive field....
fisico32

Replies: 3
Views: 12909

PostForum: Questions Related to Antenna Theory   Posted: Thu Oct 28, 2010 3:47 pm   Subject: antenna reactive field....
Thanks Schubert,

In the far field the E and H fields are in space-time quadrature. Both fields have energy density (in equal amount).

What does it actually means that in the reactive region thes ...
  Topic: broadband antennas
fisico32

Replies: 3
Views: 12535

PostForum: Questions Related to Antenna Theory   Posted: Thu Oct 28, 2010 3:35 pm   Subject: broadband antennas
Thanks for the reply!

antenna impedance, for what I know, is the ratio of the voltage to current at a specific point in the antenna.....So the impedance can vary along the antenna structure....
...
  Topic: broadband antennas
fisico32

Replies: 3
Views: 12535

PostForum: Questions Related to Antenna Theory   Posted: Tue Oct 26, 2010 8:08 pm   Subject: broadband antennas
Hello Forum,

what is the conceptual explanation of why a spiral antenna is a broadband antenna?

A spiral antenna is self-similar: an enlarged version of the antenna is the antenna itself but sim ...
  Topic: antenna reactive field....
fisico32

Replies: 3
Views: 12909

PostForum: Questions Related to Antenna Theory   Posted: Tue Oct 26, 2010 8:05 pm   Subject: antenna reactive field....
Hello Forum,
question about reactive field:

very very near an antenna there is the so called reactive field. The E and H fields are called reactive there because energy is not radiated away.
The ...
 
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