By JonathanGuthrie, 13 March, 2013

An antenna is an energy conversion device. It converts electrical current to and from electromagnetic radiation. I've been thinking about how antennas work for a while now, and I've been meaning to write down some of those thoughts. This has been driven, in large part, about questions that I had about why you could use a center fed dipole on the fundamental frequency or the third harmonic, but not the second harmonic.