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I have the Spectrum Digital DSK board and loaded the software onto my laptop but got distracted and put everything aside. Today I tried to start the software and found that it's incompatible with Windows 7. I looked all over for the CD but couldn't find it! Does anyone have the software that...
I don't think that is correct. This is a one port system so the reflection coefficient is given by the S11 parameter. In fact from this correctly simulated S11 parameter (the reflection coefficient) I can calculate the complex propagation constant and the values agree very well with measurement...
what is rf gamma value
If I add a port to a microstip line and run a simulation, the value of Gamma returned is always:
Re(Gamma) = 0
im(Gamma) = 1
I'm assuming this Gamma is the standard,
Gamma = Alpha + j Beta
where Alpha is the attenuation and Beta the propagation constant. I can...
We have a collection of target assemblies that are used to validate our computational software. A few assemblies consist of rectangular and cylindrical microwave resonant cavities (which are basically implemented as just terminated copper tubes and boxes with sma connectors). We had a somewhat...
Re: PCB substrate with dielectric constant 30; fact or ficti
The DLI article does indeed list substrates with very high dielectric constant. But what are CD, CG, and NR type substrates?
I've been told that there are ceramic based PCB substrates with dielectric constant as high as 30+. I've tried searching for such material without success. Does anybody know if such a substrate exists commercially?
Does anyone know where I can find simple example ExpressPCB layout designs for Microwave boards. There are plenty of example PCBs for digital boards but I can't seem to find anything for a typical Microwave board. Specifically I'm looking for a very simple Directional Coupler implemented with...
Rautio - I figured out why I was getting discrepancies with some geometries with calculated characteristic impedances that differ significantly from 50 Ohms. With the Sonnet tools, the port impedances are set to de-embed to 50 Ohms. (And with Sonnet Lite you can't change this; CSULB is trying to...
Thank you, that does make things clearer. Following your explanation I derived an equation for the "generalized" reflection coefficient for a three-layered medium (based off of "Waves and Fields in Inhomogeneous Media" but converted to transmission line parameters). I then wrote a small program...
Here's maybe a dumb question concerning this approach. The Zo has little variation from 1-10GHz yet the Y,Z,S parameters have a deep resonance at 8 GHz. Doesn't this represent a contradiction?
Thanks again for your replies...
ansoft+effective+dielectric+constant
In Sonnet I simply created a 10x10mm box, placed a 1x10mm rectangle, then added ports to both sides. I then confirmed that the dielectric substrate parameters are that same as used by Ansoft. Geometry entry into Ansoft was equally trivial. Is there something...
ansoft comm diff
I'm implementing very simple, single trace, geometries in Ansoft and Sonnet tool sets. For example a 10x1mm through-line microsrtip with a standard edge port on both ends. When I generate Y and S-Parameters and compare, I get results I don't understand. The frequency resonance...
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