"Dennis Vogel" <(E-Mail Removed)> wrote:
>I am reinstalling my WiFi antenna in my RV and cannot remember what is the
>most used polarization. Is it vertical or horizontal?
It doesn't really make any difference, as such.
If you want an omni directional pattern from your antenna,
you'll almost certainly want to use vertical polarizationm, just
because most "omni" antennas are only omni directional when they
are vertical.
But all that actually matters is that the polarization of the
receive antenna matches that of the received signal. And note
that the polarization of the signal isn't necessarily exactly
the same as the transmit antenna either! If the signal bounces
off a few strange objects (aluminum foil backed insulation in
walls is a very nice reflector, for example) there may be some
changes, depending on the angle of the reflections.
There are a couple of practical ways you can use that
information. One is that if you can use horizontal polarization
(for example if you only have two units, and this would be very
applicable if one is on a different floor than the other), it
might provide you some isolation from other nearby wifi radios,
almost all of which are going to be using vertical polarization.
Typically there can be a 25 to 35 dB difference vertical and
horizontal polarization, if there are no other factors.
Another practical thing to do is adjust the angle of one antenna
while checking the signal strength. Just because the other
antenna is vertical doesn't mean, for example, that a PCI card
with a wifi antenna sticking out the back of a desktop machine
is going to get the best signal with that antenna in a vertical
position. Move it around and see where it does get the best
signal.
--
Floyd L. Davidson <http://web.newsguy.com/floyd_davidson>
Ukpeagvik (Barrow, Alaska)
(E-Mail Removed)
Similar Threads
Linear Mode
