Re: Transmission Line Design Advice for GSM Module???
ok starting to make sense now,
Any benefit to a Grounded Coplanar Waveguide Vs a regular Coplanar Waveguide??
Ill start to do some maths then and come back to you guys once i have some numbers
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ok i have done some maths as follows and would appreciate any thoughts or opinions,
Ideally i would like to keep the trace length below 7.5mm or so but im not sure how realistic this is (BTW i did my claculations based on 1.8Ghz)
Failing a super short trace maybe i could try a Coplanar WaveGuide on the top side of the board,
If i go with: relative permitivity of FR4 @ 4.6, trace width of 1.5mm, Ground Plane Spacing of 0.2mm and board thickness of 1.6mm i am getting 51.2 ohm impedance which i think is ok??
2mm| 0.2| 1.6mm| 0.2| 2mm
------_____----------___----------
1.6mm Substrate (FR4)
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I do not plan on having ground planes where i can expcept around the microcontroller crystal and small places where necessary,
Plan would be to just tie the Groound traces to Ground,
Anyone any thoughts??
Thanks,