Forgot to tell you, Louis, that you can send your parts to us, if the parts
are many and complicated. We have RF test stations en mass, specs, TDRs,
waveform analyzers, anything for microwave testing. Just in case.....
Inge


On 18 September 2013 20:10, Craig Sullivan <[log in to unmask]> wrote:

> Assuming you are talking about a coplanar waveguides on the surface, there
> are generally two differences. Using Polar's nomenclature, I think it's
> called "coplanar waveguide with ground" (CPWG) and the other "coplanar
> waveguide" (CPW). CPWG has a return plane on an underlying layer, CPW does
> not. Your initial description is a little misleading as to which you have.
>
> If I remember correctly, the CPWG will be tested in the same fashion as a
> microstrip since it has a return plane on a layer beneath. For the CPW
> where no return plane is underneath, you will need to test using the
> adjacent ground strips on the surface. See this:
> http://www.polarinstruments.com/support/cits/AP153.html
> http://www.polarinstruments.com/support/cits/AP125.html
>
> Craig Sullivan
> Manufacturing Engineer
> MPL Incorporated
> P: 607.266.0480 x115
> F: 607.266.0482
> [log in to unmask]
>  Please consider the environment before printing this e-mail.
>
>
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Louis Hart
> Sent: Wednesday, September 18, 2013 12:01 PM
> To: [log in to unmask]
> Subject: [TN] impedance measurements for coplanar waveguide
>
> Technetters, how does one make impedance measurements on what I think is a
> grounded coplanar waveguide?
>
> The configuration is, in one plane, what appears to be a signal trace
> flanked by two much larger conductors.
>
> I have a Tektronix time domain reflectometer with P8018 (for single-ended
> impedance) and P80318 (for differential impedance) probes.
>
> I called Tektronix, from which I have gotten excellent information in the
> past on other matters, but the technical support could not advise on this
> matter.
>
> Thanks for any insight.
>
> Louis Hart
> Compunetics
> Monroeville, PA
> USA
> [log in to unmask]<mailto:[log in to unmask]>
> 412-858-1232
>
>
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