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How to calculate the VSWR from the input impedance?

 
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Riyad



Joined: 19 Feb 2004
Posts: 17
Post05 Mar 2004 10:44   How to calculate the VSWR from the input impedance?
Hi,

I am stuck on how to find the VSWR from the input impedance! Can you please help me?
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flyhigh



Joined: 12 Nov 2003
Posts: 507
Helped: 25
Location: somewhere over the rainbow
Post05 Mar 2004 15:32   Re: How to calculate the VSWR from the input impedance?
Hi,

first calculate reflection coefficient

Gam=(z-z0)/(z+z0)

Then calculate VSWR as

VSWR=(1+mod(Gam))/(1-mod(Gam))

flyhigh
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Black Jack



Joined: 02 Dec 2003
Posts: 214
Helped: 10
Location: UKRAINE
Post05 Mar 2004 15:45   Re: How to calculate the VSWR from the input impedance?
Riyad wrote:
Hi,

I am stuck on how to find the VSWR from the input impedance! Can you please help me?


See attachment

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lkuzu



Joined: 01 Jun 2001
Posts: 63
Post05 Mar 2004 19:38   Re: How to calculate the VSWR from the input impedance?
Use smith chart. Calculate the normalized impedance first. Mark the normalized impedance on the Smith chart. Then draw S (VSWR) circle. Then read the S value on the smith chart. R circles and S circles are tangential to each other.

I hope it helps.

regards,
Lkuzu
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