From: William Flynn <flynn@at...>  20100225 17:46:23

Dear qucssupport, I hope you can help me with the following query please. I've very recently discovered and started using QUCS which is a great software tool. I wanted to do some parameter calculations for a microstrip line, which I did using the QUCS transcal tool. I entered the various parameters and ran the analysis which gave me a value for the line impedance which is what I'm interested in. I saved the transcalc parameters, pasted here as for reference: <Microstrip> Er 3.4 NA Mur 1 NA H 50 um H_t 2.54e+18 mm T 30 um Cond 5.813e+07 NA Tand 0.0019 NA Rough 0.0024 mm Freq 10 MHz W 80 um L 1000 mm Z0 57.1415 Ohm Ang_l 17.8917 Deg </Microstrip> I don't know what "H_t" parameter is, any ideas? I looked online but couldn't find anything. I used the default value given in transcalc and converted it instead to mm. I then copied the parameters in transcalc to the clip board (copy to clipboard, under transcalc's EXECUTE menu) and inserted in my QUCS schematic. I would like to see how the impedance changes with frequency. A dumb question I realise, but how do I do this , what do i plot ? The default equation that gets pasted in to my schematic window is ZL=real(sqrt(A[1,2]/A[2,1])) Assuming that this is the impedance, if I plot this I get a different value to what the transcalc calculator calculated, eg. calculator said 57 Ohms, Zl shows 54.67 (if i go out to a larger number of digits, only see a change in the 4th or 5th decimal place over the frequency sweep). Does this make sense? I displayed the data in table form and graph form. I wanted to export the data to .csv format. If I select the graph or table and use the "Export to CSV" option in the project menu, I get the Error dialogue box telling me to "Please select a diagram graph!" but that's just what I've been doing. any ideas? Thank you for your assistance, Best regards, Will Flynn. 