[SI-LIST] Re: How to obtain accurate S11 for 75ohm Zo DUT using Network Analyzer?

Agilent makes VNAs with 75 Ohm ports.  If you have to use a 50 Ohm 
device get a wideband 50Ohm to 75Ohm pad.

Steve
ji-fong_lim@xxxxxxxxxxx wrote:
> Hey SI/MW Expert,
>  
>
> How to obtain accurate S11 for 75ohm Zo using Network Analyzer? Currently, I 
> have a 75ohm characteristic impedance DUT which need to perform S11 
> measurement using network analyzer which have 50ohm impedance internally.
>
>  
>
> >From my basic understanding of network analyzer measurement technique, the 
> >DUT has to match its respective termination. For my case here which is 75 
> >ohm DUT, it should interconnect to another 75 ohm termination of network 
> >analyzer in order to obtain S11. I have perform such configuration inside 
> >ADS simulation model setup by having 75ohm termination at the front and back 
> >portion respectively towards 75ohm DUT characteristic impedance. Is this S11 
> >simulation result considered appropriate to emulate a 75ohm termination at 
> >network analyzer? 
>
>  
>
> Cheers,
>
> Ji Fong
>
>
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