S21 in Smith-Chart ? - RF Cafe Forums

RF Cafe Forums closed its virtual doors in late 2012 mainly due to other social media platforms dominating public commenting venues. RF Cafe Forums began sometime around August of 2003 and was quite well-attended for many years. By 2012, Facebook and Twitter were overwhelmingly dominating online personal interaction, and RF Cafe Forums activity dropped off precipitously. Regardless, there are still lots of great posts in the archive that ware worth looking at. Below are the old forum threads, including responses to the original posts. Here is the full original RF Cafe Forums on Archive.org

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Smithie

Post subject: S21 in Smith-Chart ?

Unread postPosted: Fri Jul 08, 2005 5:24 am

Hello,

does it make sense to visualize S21 in a Smith-Chart ? What would be your reference impedance ?

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Guest

Post subject:

Unread postPosted: Fri Jul 08, 2005 7:49 am

Not really.. If there is gain you wont see anything unless you have an expanded smith chart. If you want a visual aid for S21, a polar chart is the way to go.

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Jeanalmira

Post subject:

Unread postPosted: Mon Jul 11, 2005 3:39 am

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Joined: Tue Mar 15, 2005 11:43 pm

Posts: 65

Location: Singapore

Hi :

Yes, I agree with the previous post.

just want to add that, smith chart is limited to Magnitude 1. While at most cases, |S21| >1.

That's why, it can't be seen in the smith chart unless you expand it.

Regards,

Jean

Posted  11/12/2012