Manfredi, Albert E wrote:
Thanks, Dale. Cliff Benham wrote:Does this also mean that a circularly polarized receive antenna is also a *single channel* antenna as well?Aha. I think I see what you're asking. Like, can CP antennas be used for transmitting MIMO-like signals. Sounds like no is the answer. For that, you want the maximum possible isolation between the polarities. Here, ideally, they would be identical and just phase-shifted.
No.I was asking about a circularly polarized antenna being used only for receiving TV signals.
If a circularly polarized antenna has a 90 degree phase delay between the H&V elements
then it follows that it is only good for one frequency.This is because the 90 degree delay line is only 90 degrees at one particular frequency.
At a lower frequency it would be less than 90 degrees. At a higher frequency it would be more than 90 degrees
Therefore a circularly polarized TV antenna used for receiving is only a "single channel" antenna.
