Thread: How do you polarize a radio wave?

Are radio waves difficult to polarize, or are they naturally polarized when they're created by an antenna? Do they remain polarized if you focus them using a dish?

related post here for you:

http://www.thescienceforum.com/Can-a...ght-26295t.php

Ref Kojax's question. When I worked for English Electric, I was given a circularly polarised antenna plus a receiver. All I did was to join them together. It seemed to work OK. Physically the antenna looked like a big corkscrew made from a single piece of metal. The corresponding transmitter had four rod aerials, mounted radially, at 90 degrees to each other, all in the same plane, at right angles to the main axis of the cylinder, on opposite sides of it, and fed from four unequal lengths of cable. As far as I know there was only one, single phase, radio frequency oscillator. The different cable delays caused the required rotation of the field around the missile.