The network analyzer after calibration measures the mounted two port network S - parameters  on the the frequency domain (S11, S12, S21, S22). for example if you measure the input reflection coefficient S11 at difference frequencies (amplitude and angle) you can establish either a periodic form so you can find the inverse Fourier series. or if there is no periodicity you evaluate the inverse Fourier Transform.

Yes, it is possible to obtain S11 in time domain. Use the largest bandwidth and the largest number of points (values to be selected on your network analyzer) for the frequency-domain measurement of S11. Then, use Fourier Tranform in order to obtain the time-domain version of S11(f).

Thanks  all.

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Muhammad:

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Since you paid a great deal more than $11 for your analyzer,

it should be easy to get $11 for it, in time for the holidays.....

;

The Jester

Two points.

I like Mr Gilbert's answer so much, it summarizes about all we French like in English humour (I eventually got used to it as I worked 7 years for EADS in Portsmouth :). Congratulations Sir, for your carreer to, started mine working with AD's analog, mixed signal and DSP devices in the early nineties and we always got ahead of competitors thanks to your products... and some engineering ;)

To the point now: most modern NA can provide time domain information, TDR (Time Domain Reflectometry is often used to "locate" a discontinuity in sat comms for example. Best is to check the very good AN from Agilent on this topic (link below). Enjoy.

http://cp.literature.agilent.com/litweb/pdf/5989-5723EN.pdf

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Patrick:

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Now and again it's good to have room for a little jesting,

in any field of endeavour. It would be interesting to write

s book called "Major Inventions that Came from a Joke".

.

I personally believe that a sense of humour and a deep

love of (real) music are essential aspects of the creative

persona - although an incomplete description.I will try to

attach an overly-long essay about this topic, written too

many years ago,  (I must caution you that your machine

may blow up due to its size).

.

The Lone Arranger

Hi Barrie, I can only agree with you, I could maybe add a chapter about a few - inventions - first discussed around the coffee machine or in the cantine... that do not take place anymore, all young engineers around me being on their smartphones during breaks.  As far as music is concerned I join you as well with around 500 CD from Tallis Scholars to Amy Winehouse (...was she an expert in fuzzy logic?). Being a signal processing engineer with a relatively strong background in analog electronics I realized after a few years that I was not listening to the same music whether I read about analog or digital stuff...climbing (do some alpinism as well) or just resting... I do not know if fluid dynamics engineers listen to the Moldau from Smetana... but the must be some kind of reason... :)

I look forward to such publications from you (could do the translation into French too), you could always drop me an e-mail if you need some pictures to illustrate your talk (yes, in adition to music I also think we need to feed our eyes with visual art), interestingly I attended some poetry reading on Sunday, a mix of B. Britten work (poetry and Harp music) and nice accompanying pictures dispayed on the celing in the university observatory in Bremen. You might have something for a TED talk (...) but maybe this now gets a bit far from Mr Sajjad's concerns about S11...

[email protected]

Best regards

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Patrick:

. 

We have indeed reached a long way - too far, in fact - from the

original question. It's time to "keep these lines open" for serious

matters about $11 - ach!  I mean S11.

'

Nonetheless I'd very much like to chat by e-mail. I can be found

lurking at [email protected].

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The Lone Arranger 

If your network analyzer has the option "Time domain", it is sufficient to use it. If not, then you must store the S11 values on a file on the hard disk of your analyzer, then transfer the file on a computer in order to use the IFFT routine.