Antenna Definition and 406 Threads

I am aware of the apperent presence of electrons on the [flat, top] base of an antenna such as one on a radio. I took the time to obtain a magnet with moderate strength. I placed the magnet about a centimeter away from the [flat] base of the antenna and found it vibrated. As I decreased the...

Just wondering if anyone happens to have an electromagnetic diagram of how a four antenna array would look. Provided that all four antennas’ form a square and edges are one wavelength in distance? Thanks Philip

what makes antenna to radiate,the basic principle... :smile:

If light is just an EM phenomena like radio waves (with more energy) would it be possible to build a transmitter that transmits in the light range? If you were to do this, would you see light that just seems to propagating from the antenna?

Lets take a unidirectional antenna. The waves you acquire are transformed into light that you can see. You designate the freq. into specific colours and what would you see?

OK here is what I am trying to figure out there is a large factory by my house which towers about 4 stories above the surrounding community. on the roof there is an array of 802.11b anttenas (im assuming its B and not A cause B has larger range) there are 10 large anttenas, 5 on one side of...