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@YY
Joined: 29 Oct 2009
Posts: 6
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 30 Oct 2009 3:59 Problem Regarding Reflector Coefficient |
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| Since the reflector coefficient, Γ which shown in the VNA was in dB form. If I wanna look for the Zin by using the smith chart, I wonder is the Γ value is in normalize form or not. Can we directly apply the Γ in the smith chart to find the Zin?
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tyassin
Joined: 22 Jul 2004
Posts: 340
Helped: 44
Location: Northern Hemisphere
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30 Oct 2009 12:06 Re: Problem Regarding Reflector Coefficient |
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Hi
It is NOT in normalised form.
Yes you can find the input impedance for small-signal.
Regards
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@YY
Joined: 29 Oct 2009
Posts: 6
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30 Oct 2009 18:35 Re: Problem Regarding Reflector Coefficient |
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| if it's not in normalize form, then should we convert it into normalize form before we apply into the smith chart?
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tyassin
Joined: 22 Jul 2004
Posts: 340
Helped: 44
Location: Northern Hemisphere
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31 Oct 2009 20:26 Re: Problem Regarding Reflector Coefficient |
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Hi
Yes that is correct
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31 Oct 2009 20:26 Ads |
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Kohi_boy
Joined: 20 Apr 2008
Posts: 133
Helped: 15
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01 Nov 2009 2:06 Problem Regarding Reflector Coefficient |
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Reflector coefficient in dB. Are you referring to S11 ?
If so, you can change S11 to r (in Mag and Phase).
Given Mag and Phase of r, you should be able to plot in the smith chart and obtain the normalise Zin from the chart.
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Chinaski
Joined: 17 May 2001
Posts: 217
Helped: 5
Location: Spain
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02 Nov 2009 9:31 Re: Problem Regarding Reflector Coefficient |
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| Push the FORMAT button on your VNA front panel and change to Smith Chart. It's the easy way. Nevertheless, try to study harder before using a VNA (it's a very expensive toy to play with)
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