AnsweredAssumed Answered

vrf Smith Chart display

Question asked by bill.ossmann on Dec 15, 2003
Yup, that does it. Just calculate the reflection coefficient-->unbuild complex-->build coord and feed to the display. Sure a lot easier than building your own.

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Bill Ossmann
Philips Ultrasound
e-mail:  bill.ossmann@philips.com



                                                                                                                                         
                                                                                                                                         
                                                           To:   VRF <vrf@agilent.com>                                                   
                                                           cc:   (bcc: Bill Ossmann/ANR/MS/PHILIPS)                                      
                                                           Subject:    [vrf] Re: Smith Chart display                                     
                                                                                                                                         
               "Pickles, Warren"                           Classification:                                                               
               <Warren.Pickles@tycoelectronics.                                                                                          
               com>                                                                                                                      
                                                                                                                                         
               12/16/2003 06:40                                                                                                          
               Please respond to "Pickles,                                                                                               
               Warren"                                                                                                                   
                                                                                                                                         
                                                                                                                                         




I remember having this problem a while back.  Solved it by using a Magnitude
vs Phase display instead of polar plot.  That's located under Display ...
Spectrum ... Magnitude vs Phase (Smith Chart).  It accepts coord data rather
than separate arrays of angle and real data - so each trace can have its own
angle data.  I suggest you give that a go.
If you want I can trawl through and find the original code.
Regards,
Warren


-----Original Message-----
From: bill.ossmann@philips.com [mailto:bill.ossmann@philips.com]
Sent: 12 December 2003 16:32
To: VRF
Cc: VRF
Subject: [vrf] Re: Smith Chart display









>I am using polar display (Smith chart), but it seems that I cannot display
2 curves that have different magnitude and phase.
>I would like to display two curves as I do in X vs. Y graph, when I can see
the name of the curve.
>I would like to know if smith chart has the same capability.
>It is very important to see the name of the curves on the graph.


From the Help for Polar Plot:
When more than one trace is to be plotted, each execution of the Polar Plot
object uses the single angle input data with each trace's Radius input data,
therefore, all traces share the single angle input.

So it seems it will not work to have curves with different angle scales.
This is pretty inconvenient for Smith charting, so I will log an enhancement
request.


I have made Smith charts in Matlab, though the code is kind of old. Let me
know if you are interested.

--
Bill Ossmann
Philips Ultrasound
e-mail:  bill.ossmann@philips.com









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