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Hello
Its just a PCB not any antennas. Actually I imported DXF file and they can be seen in the attached photo. How can I fill the boundaries? Also, is there any other way I can import directly without filling anything?
Thanks
Friends
I have been trying to export my 4 layers PCB from CST and import it to ALtium, but I get weird results. When I export Gerber/DXF files from CST and import it to Altium, My circuit has only some lines all around the microstrip lines which are not filled with any layer like the following...
Re: RF to ADC or downconverted RF to ADC
Well, I am supposed to increase level of signal by LNAs after my antenna. When I say "direct" I mean without converting to lower frequencies. Do you think there would be any problem if level of signal is enough? Also, how much power the signal must...
Re: RF to ADC or downconverted RF to ADC
Hi Barry,
Thanks for your help.
By "Converting RF to digital needs more bits?" I meant: For example if we want to digitalize a RF signal at 200MHz each sample to be saved on memory needs 20 bits. Then if we work with the 1.5GHz signal without...
Dear All,
I am working on phase array antennas to do null-steering.
I have read lots of papers in this field, but still I have this question in my mind.
Which one is the better approach and why?
We go directly from antenna to ADC at RF (1.5GHz). Or first we do downconversion to IF (200MHZ)...
Hello,
I am trying to excite two parallel striplines in CST according to the photo. I want to see return loss of the differential mode, that's why I connected a discrete port, but I got this error "The discrete edge port is inside perfect conducting material".
Do you have any suggestion? I...
Friends,
I am looking for a substrate to use in my antenna to absorb some waves. Loss tangent of the substrate should be close to 0.1
Do you have any idea about lossy substrates? I know the worse lossy case outside is FR4 :)) I need something worse! If not, do you have any idea how I can...
Hello,
I am designing an antenna which has some lumped components like resistors. One of the resistors is connected between two strip lines. When I sweep the width of the strip lines, because size of the antenna changes, the resistor is not connected to the strip lines anymore and is somewhere...
Hi
Thanks for the help.
When I export results from CST, it gives me .txt file. How can I plot it with Matlab or Excel? Do I need to convert it to another format?
Friends
I am going to import E-cut and H-cut measured results of my antenna to CST. How can I do it?
It seems CST accepts just ASCII files. So, I converted the XLSX file to CSV and then saved it as txt. When I imported the data, it gave a weird rectangular plot. It should be like a polar plot...
Friends,
I am going to plot constant power contours in ADS at higher harmonics, say the second and third harmonics! How can I use load pull in ADS to do that? Any idea or thought?
Thanks
Friends,
I'm working with CST and doing optimization. Do you have any idea how can I assign a goal to phase differences like: phase(S(2,1))-phase(S(3,1))
I know how to do it in ADS, but in CST it seems there is not any way! The following photo shows the optimizer window!
Thanks in advance!
I'm working at 6.78 MHz, thank you for the information though.
- - - Updated - - -
Thank you!
I found that equation in a book too.
Rac=Rdc*h/delta
Where h=diameter of the wire
Hi
If you consider: R=pL/A which is valid for both ac and DC.
I think the only difference between rac and RDC is skin effect. In higher frequencies, area where current can pass through is decreased (because of the skin effect), so rac is increased. Now, I'm looking for the relation between them.
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