Dave-
Thanks for the confirmation. I had myself 90% convinced. I just needed that
extra 10%.
However, your explanation is really about a linearly polarized antenna
receiving a circularly polarized wave (which I already knew). The case in
question is a circularly polarized antenna receiving a linearly polarized
wave. But the two cases are made the same by reciprocity.
Don
drcuthbert@micron
.com
To
11/18/2005 08:47 <[email protected]>,
AM <[email protected]>
cc
Subject
RE: Question about circularly
polarized antenna receiving
linearly polarized fields
Don,
That is correct. There is a 3 dB "loss". As the polarization of the
circularly polarized wave propagates like a corkscrew translating
through space, and not rotating through space, the polarization lines up
half the time.
Dave Cuthbert
Micron Technology
From: [email protected] [mailto:[email protected]] On Behalf Of
[email protected]
Sent: Thursday, November 17, 2005 4:40 PM
To: [email protected]
Subject: Question about circularly polarized antenna receiving linearly
polarized fields
Dear All-
Suppose I have a circularly polarized receive antenna immersed in a
circularly polarized EM field of x watts per square meter. At the
antenna
terminals, I receive y watts of power.
Now suppose I put that same antenna in a linearly polarized field of x
watts per square meter, coming from the same direction. If I understand
things right, at the antenna terminals, I should receive y/2 watts.
Do I have this right?
Assume all nominal conditions, i.e., rotation of circularly polarized
field
matches the antenna properly, all measurements in far field, the antenna
is
oriented for maximum signal, etc.
Don Borowski
Schweitzer Engineering Labs
Pullman, WA
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