| Electronics > Beginners |
| Coplanar Stripline Filter |
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| RFbeginner:
hello everyone, i'm designing (or at least trying to ) a coplanar stripline filter, any filter really but online there isn't a lot of informations about that , all the papers i read do not mention how and the formulas used to design the filters, I wrote a matlab code to determine the slot and strip width (using the formula from every book) and i got 0.769mm for the strip width W and and 0.119mm for Slot width S, which is perfectly confrom to 50Ohm per strip (coupled 100) when i simulated that on CST, I tried various filters i saw online and played with the variables but the best I got was some losses but nothing that makes a filter, does anyone here have an idea or formulas i could use to design a filter of any kind (BP,LP,HP,BS) knowing that I want it to work between 2 and 3 GHz ? I would be really grateful. thanks. |
| Benta:
This might help. Check out chapters 3 and 7: https://userweb.jlab.org/~brads/Manuals/Hardware/ECL_Design_Handbook.pdf |
| schratterulrich:
I have realized my first microstrip filters with ANSOFT Designer SV. It's a limited but free student version of a RF CAD software. Fortunately it includes a very powerful filter design wizard also in the SV version. You can find the software at http://www.gunthard-kraus.de/Ansoft%20Designer%20SV/ Direct download link http://www.gunthard-kraus.de/Ansoft%20Designer%20SV/English%20Tutorial%20Version/DesignerSV050610.exe Since it's been some time since i used this software, i don't know if it's compatible to windows 10. |
| RFbeginner:
@schratterulrich: thank you ! i'll download it and check it today but it seems that it only does microstrip lines , i'm doing a coplanar stripline CPS ( no ground plane, no vias...) i'll check it more later but thanks a lot. @Benta thank you but those formulas are for microstrips, i'm designing a CPS coplanar stripline and since its not very used there isn't really any informations about it... |
| schratterulrich:
Yes you are right, Ansoft Designer won't support CPS structures. To be honest, I didn't even know that these filter type exists. |
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