[SI-LIST] Re: AW: Impedance_Multi Step_Calculation [Urgent]
- From: johndp@xxxxxxxx
- To: si-list@xxxxxxxxxxxxx
- Date: Tue, 12 Apr 2011 15:37:04 +0100
Jayasuryan,
The type of impedance matching transformer depends on the bandwidth you
require. Paul points out that there some coverage in Pozar, there is more
substantial covarge in RE Collins ?Foundations For Microwave Engineering?.
You can use numeric tools (matlab/mathcad) to determine the impedances you
require and a 2D EM solver to determine the widths for the given impedance
steps. In the limit the impedance transformer becomes a smooth curve between
one impedance and another, how you get there was widely studied in the 50's and
60's.
Regards
John
levinpa@xxxxxxxxxxxxx wrote:
> Dear Jayasuryan,
>
> Please take a look at the section on Impedance Matching and Tuning
> in David Pozar's book "Microwave Engineering." There you will find
> a discussion of single-section and multisection transformers with
> sufficient information to design your transformer. Your design will
> be improved, however, if you have access to a linear simulator such
> as Genesys or ADS.
>
> Incidentally, in your diagram you have reversed the impedances of the
> 30 ohm and 50 ohm sections. For a transformer, the impedances should
> always increase or decrease monotonically. (Otherwise you create
> some sort of filter...)
>
> Good luck!
>
> Regards,
>
> Paul Levin
> Principal Engineer, InnoSense LLC
> ______________
>
> On 4/12/2011 6:09 AM, Jayasuryan KG wrote:
> > Dear Experts,
> >
> > I hope all are doing fine.
> >
> > I have an issue with Multi Step Impedance Calculation. Please find the
> > schematic for your reference. Follow the link to see the pictures!
> >
> > http://photobucket.com/SILIST
> >
> > I have different impedances like 19 Ohm , 50 Ohm and 30 Ohm . Could yo=
> u
> > please help how to calculate the impedance in Multi Step( please see th=
> e
> > link) and implementing it in layout?
> >
> > Looking for your immediate response. Thanks in advance!
> >
> > Best Regards,
> > - Jayasuryan
> >
> >
> > -----Original Message-----
> > From: Havermann, Gert
> > Sent: Tuesday, April 12, 2011 12:05 PM
> > To: Jayasuryan KG ; si-list@xxxxxxxxxxxxx
> > Subject: [SI-LIST] AW: Impedance_Multi Step_Calculation [Urgent]
> >
> > Attachments are not supported on SI-List. You either have to draw the
> > schematic in ASCII, or put the Figure onto the web (google picasa or
> > similar).
> >
> > BR
> > Gert
> >
> >
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> > -----Ursprüngliche Nachricht-----
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> > Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]=
> Im
> > Auftrag von Jayasuryan KG
> > Gesendet: Dienstag, 12. April 2011 07:26
> > An: si-list@xxxxxxxxxxxxx
> > Cc: Jayasuryan K G
> > Betreff: [SI-LIST] Impedance_Multi Step_Calculation [Urgent]
> > Wichtigkeit: Hoch
> >
> > Dear Experts,
> > I hope all are doing fine.
> >
> > I have an issue with Multi Step Impedance Calculation. Please find the
> > schematic for your reference.
> > I have different impedances like 19Ã?©, 50Ã?© and 30Ã=
> ?©. Could you please help
> > how to calculate the impedance in Multi Step( please find attached pict=
> ure)
> > and implementing it in layout?
> >
> > Looking for your immediate response. Thanks in advance.
> >
> > Best Regards,
> > - Jayasuryan
> >
> >
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