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i am trying to remove noise from a voltage signal i obtain.
I plan to use the wavelet toolbox to do the denoising.
after reading the tutorial below, and the help file on wavelet toolbox in matlab help.
**broken link removed**
Using the GUI for 1 dimensional discreet wavelet transform,
it...
http://www.home.agilent.com/agilent/editorial.jspx?cc=US&lc=eng&ckey=1536926&nid=-11143.0.00&id=1536926
in the link above,
it explain how equation below is possible.
Z=(2Zo(1-S21 )) / S21
the first thing in the explanation is the assumption that
"Since the relationship between the Vs and...
indeed the S parameter and Z relationship is important.
i've look through alot to find a good relationship, currently trying the one written in this note...
Hi, yup.
still working on it.
i'm thinking of improving the fixture, reducing any unwanted fixture effects, i just realized that the coaxial cable that connects the plates are absolutely unnecessary. How silly of me to think i need to ground them, they are already grounded. *facepalm.
now...
less accurate for DUT with impedance that is much different from 50 ohm.
the above statement is for the magnitude of the impedance?
or the real part of the impedance?
Hi guys,
i know the main function of a network analyzer is not to measure impedance, but i still have to rely on it since i dont have a impedance analyzer.
i read in many notes and some text book, that from a 2 port measurement,
the B parameter is the series impedance...
Just to show you guys the overall results on a large scale.
other than this, all my results are from 40MHz-200MHz. (40MHz is the lowest my vna able to measure)
i did a change to the model, i'm measure using a 2 port network. both plates are connected to each port.
and their ground connected by...
Dear pstuckey,
i've did as you suggested, i connect the 2nd ground plate to the VNA port 2.
and repeat my measurement. using the method i stated in the first post, these are my results.
top left: S11 in dB vs frequency
Bottom left: S11 phase vs frequency
top right: |Z| vs frequency
bottom...
I see, I will try it tomorrow when I get back to my lab.
I will connect the 2nd plate to port 2 and try again.
Thank you for your suggestion. I remember you told me this in my other thread I asked.
But I don't have a 50 ohm termination. I will connected it to port 2 if its the same.
- - -...
The coaxial wire is indeed a simple wire to connect the 2nd plate to the ground.
Based on previous experience, if use normal wire, every time it change position or slightly bend, it will change to a difference inductance value.
Its too sensitive to changes, causing the vna reading to change as...
1. Its AC, i mentioned using VNA to measure, its measuring in AC.
the frequency i start from 40MHz to 8GHz, but readings higher than 200MHz are dont make sense, such as negative value. so i only take from 40MHz-200MHz
2. The MUT is not a conductor, its a dielectric, FR4 to be exact.
After...
I wish to make a fixture/tool that is able to measure dielectric constant.
after researching through the web and read numerous papers and application note.
i decided to try this **broken link removed**
at page 5. using parallel plate capacitor method.
The idea is simple, as long i am able...
when i do a sweep of impedance vs frequency, the resonant frequency is the part where the impedance is the lowest right?
so the capacitor can function well as long as less than the resonant frequency? correct?
- - - Updated - - -
when i do a sweep of impedance vs frequency, the resonant...
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