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Insertion loss? - RF Cafe Forums
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| Qacer
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Post subject: Insertion loss?
Posted: Tue Feb 06, 2007 10:18 pm
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Joined: Sat Apr 23, 2005
2:09 pm
Posts: 19
Location: Tampa, FL
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Hi
Is cable loss the same as insertion loss?
If I were to test a cable under a calibrated
network analyzer setup, would I be able to figure
out the cable loss using the S-params? I'm
thinking that insertion loss is just S12 - S11,
but I don't know much anyway. Thanks!
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Jeanalmira |
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Post subject:
Posted: Wed Feb 07, 2007 3:47 am
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| General |
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Joined: Tue Mar 15, 2005
11:43 pm
Posts: 67
Location: Singapore
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Hi :
The insertion loss is basically the
loss as the ratio of Pout and Pin. Or, well known
as transmission coefficient.
So insertion loss
= |S21| and since the cable is passive device, so
|S12|=|S21| . If the cable is low-loss, the |S21|=|S12|
must be somehow equal or close to zero dB.
In addition, S11 refers to reflection coefficient,
which means how much the input power that is reflected.
Again as cable is passive device, so |S11| = |S22|.
at low-loss cable, the |S11| = |S22| must show low
values, preferable <-20dB.
I hope it helps.
Regards,
Jean
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Qacer |
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Post subject:
Posted: Sat Feb 10, 2007 4:54 am
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Joined: Sat Apr 23, 2005
2:09 pm
Posts: 19
Location: Tampa, FL
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Posted 11/12/2012
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