On Fri, 4 Oct 2019 at 16:32, Oristo <ormpoa@...> wrote:
its become the consensus that return loss is a negative number
IMO, "return loss" is a poor term.
But one used very extensively. Personally, I don't have a problem with it.
Arguably, >>any<< return is loss, when sending power is the goal. In which
case,
"return loss" might be power sent (since lost from return)..
Not always. There are one-port amplifiers, such devices as Gunn diodes and
IMPATT diodes, but they are quite rare. For them, the signal returned is
greater than that sent to them. They work on the principle of negative
dynamic resistance. That means increasing the voltage, decreases the
current. They still have a positive resistance though. A device might draw
100 mA at 7 V, but 90 mA at 8 V. The voltage has increased, but the current
goes down.
I know what my opinion on the subject is (return loss is positive for any
passive device), but I am not going to try to force it on anyone else.
I'm an atheist, but I would never try to convince anyone of any religion
that their belief is silly. It is a waste of my time.
--
Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD,
Essex, CM3 6DT, United Kingdom.
Registered in England and Wales as company number 08914892
Tel 01621-680100 / +44 1621-680100
