[ Reply | Next | Previous | Up ]

Re: Where Does The radiation Come From?

From: David Jefferies
Date: 27 Feb 2002
Time: 13:07:30
Remote Name: 195.92.168.168

Comments

Strictly speaking, there are two sources of radiation.

1) A pre-existing propagating wave, otherwise seen as a stream of photons. They can be diffracted, refracted, and diverted.

2) Or accelerated charge. This is entirely equivalent to a time-varying current.

In the latter case, the contribution to the remote field, for a little element (length) of changing current, is proportional to

*the size of the current *the length of the wire in which it flows *the rate at which it changes (ie frequency)

If any one of these is zero, there is no radiation.

reasonably simple...

There is more.

regards

David.

Last changed: May 04, 2006