George,
Glad you asked!
1) Although the current IEEE definition of antenna gain does not
include mismatch loss (it's defined for a complex conjugate matched
load), nobody I know of out here in the real world (industry) backs
out the mismatch loss when reporting measured gain. So, I vote to
modify the definition to fit the defacto standard. Define gain to
include mismatch loss when an antenna is connected to its nominal
output impedance (for instance, 50 ohms or 75 ohms).
2) Same idea - antenna gain should include polarization mismatch loss.
It would be much more difficult to measure, otherwise, and I don't
know anybody that does that in industry.
3) Yes, I believe the definition of gain for both transmit and receive
should be the same. What a monkey wrench that would throw into the
works if they weren't!
Matt Taylor
> ....
>
> So here are several questions:
>
> 1) Do you believe that the definition of gain (of an antenna), when
> used with no qualifying adjective, should include mismatch loss or be
> defined in terms of a complex conjugate matched antenna?
>
> 2) Do you believe that polarization mismatch in a link budget context
> should be part of the definition of gain or treated separately?
>
> 3) Do you believe that the definition of gain for a receive antenna
> should be the same as for a transmit antenna?
Received on Fri Mar 03 2000 - 04:18:24 EST
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