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CC3100MOD: antenna trace impedance

Michal Szymura
Prodigy 10 points
Part Number: CC3100MOD


I'm trying to design antenna wire and calculate trace width. On Fr4 2-sided PCB 1,5mm thick and 35um copper i get more than 100 mils trace width in microstrip PCB stack and 50 mils in stripline stack.

To check my calculation I made calculation for TI Eval board. TI board has 35um copper, core 0,92mm, FR4 2-sided PCB, antenna track width (measured) 20 mils. Based on this data I get 92.5 ohm in microstrip mode and 61 ohm in striplaine mode, but on EVB PCB antenna trace is routed on Top layer, it means mocrostrip mode.

Am I wrong ?

  • 0
    TI__Genius 12960 points
    Hi Michal,

    You must include the GND around the RF trace for a proper calculation. You want to consider it a coplanar wave guide and not simply a micro-strip even though it is on the top layer. This is how the reference boards were designed.

    I hope this helps.

    Thanks,
    Riz