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W-band and propagation high up there - RF Cafe Forums
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| mfurman |
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Post subject: W-band and propagation high
up there
Posted: Mon May 15, 2006 2:49 pm
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Joined: Mon Sep 12, 2005
4:02 pm
Posts: 3
Location: Washington DC
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Hi Folks, I'm interested in O2/H2O/N2 absorption
on W-band. Will atmospherics/water vapor knock out
any communications with less than 1 watt amps? Think
high-up -- above the water-barrier (say 50 Km altitude)
What is a pratical range for a 100 Gigs channel
at this altiude (say 50 MHz BW)?
100 meters?,
1-10 Km?
1 AU?
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nubbage |
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Post subject: W Band Propagation
Posted: Tue May 23, 2006 7:44 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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Hi
Sorry for long delay reply
The attenuation
parameter which is the most important at 100GHz
is the first oxygen line. The rate of attenuation
is about 0.8 dB per kilometer according to data
I have.
The max CW Tx power obtainable for commercial
devices is about 50milliwatts.
The likely receiver
sensitivity is about -67dBm for that bandwidth at
100GHz.
Antenna gain of course depends on size,
and that depends on the platform geometry you have
in mind.
Plug those figures into a one-way microwave
path analysis programme and you have the answer.
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Posted 11/12/2012
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