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mutual coupling efects on antenna phase - RF Cafe Forums
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sag
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Post subject: mutual coupling efects on antenna phase
Posted: Sun Oct 29, 2006 3:22 pm
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Joined: Wed Apr 05, 2006
3:34 pm Posts: 6 |
Hay all,
I want to know what is a "safe"
distance of an antenna from another one so that
they won't effect each other in the phase point
of view (i.e ang(s21) will not be affected).
(the antennas are connected to separated receivers)
10x.
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nubbage |
Post subject:
Posted: Mon Oct 30, 2006 4:51 am
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General |
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Joined: Fri Feb 17, 2006
12:07 pm Posts: 218 Location: London UK
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It depends on the directivity of each antenna. Two
highly directional antennas can be placed almost
adjacent to each other.
A low gain system
needs a spacing of several wavelengths, although
a precise figure depends on the phase error you
are prepared to accept or are able to measure.
If the antennas are completely independent,
some isolation can be achieved by using opposite
polarization.
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sag |
Post subject:
Posted: Sat Nov 04, 2006 6:09 am
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Joined: Wed Apr 05, 2006
3:34 pm Posts: 6 |
hay,
It's not so simple... first of all,
if the antennas are patches, than at 90deg they
each have a NULL and it's depth is about 30dB at
all directiviteis. 2nd if the antennas are close
to eachother than there are parazitics fiels created
on eachother and that has a great affect. 3rd,
in phase you are more sensitive so even a 30dBc
signal changes you phase to about 1deg.....
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Posted 11/12/2012
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