| Author |
Message |
JimR
Joined: 20 May 2006
Posts: 12
|
 17 May 2008 22:33 what is rf gamma value |
|
|
|
|
If I add a port to a microstip line and run a simulation, the value of Gamma returned is always:
Re(Gamma) = 0
im(Gamma) = 1
I'm assuming this Gamma is the standard,
Gamma = Alpha + j Beta
where Alpha is the attenuation and Beta the propagation constant. I can calculate the Beta from the slope of the S11 angle plot (and it agrees well with theory) and I can see that the attenuation Alpha is not exactly zero from the S11 mag plot.
Do I need to renormalize or maybe set some switch to have the Gamma value displayed properly or am I completely misinterpreting something here?
Thank you,
JimR
|
|
| Back to top |
|
 |
Google
AdSense
|
17 May 2008 22:33 Ads |
|
|
|
|
|
|
| Back to top |
|
|
akedar
Joined: 27 Jul 2004
Posts: 295
Helped: 15
|
20 May 2008 8:03 Gamma value reported by Ansoft Designer? |
|
|
|
|
| gamma is basically reflection coefficient u can check from that point of view
|
|
| Back to top |
|
|
JimR
Joined: 20 May 2006
Posts: 12
|
20 May 2008 17:18 Re: Gamma value reported by Ansoft Designer? |
|
|
|
|
I don't think that is correct. This is a one port system so the reflection coefficient is given by the S11 parameter. In fact from this correctly simulated S11 parameter (the reflection coefficient) I can calculate the complex propagation constant and the values agree very well with measurement. I just think that there is a way to use the Ansoft tool to calculate it for me.
The Ansoft documentation clear states:
"complex propagation constants (gamma parameters)"
|
|
| Back to top |
|
|
