RF transmission lines on a pcb

[LeLyfa]

Hi,

I'm currently working on an antenna-switching project (f = 1 up to 30MHz), which includes, that I need a Z₀ of 50 ohms in my transmission lines.
I'm planning to get the PCBs manufactured by JLCPCB, they are providing every characteristical data I need, to calculate the width of the Trace in KiCAD to get to Z₀=50.

However, the calculated trace width is .3mm (&1oz. copper), but I need to get 100W through it and I think that .3mm is too thin.

Red is for RF and I've got a ground plane between RF & "data": http://prntscr.com/mqia4e

How could I solve this problem?
Thank you for help.

[radiolistener]

At a glance you can increase height of dielectric (use thicker PCB to increase distance from trace to the ground).
It will allow you to increase trace width.

For example:
dielectric height = 0.16 mm; trace height = 0.0347 mm; trace width = 0.3 mm => 50 Ohm
dielectric height = 0.506 mm; trace height = 0.0347 mm; trace width = 1 mm => 50 Ohm

[radioactive]

Use layer 3 for the microstrip ground reference.  This will allow you to make the trace much wider and will keep manufacturing tolerances from becoming an issue (core material thickness is consistent between runs).

[LeLyfa]

Thank you very much for this idea.
I'm now able to make my trace 2,28mm thick. I think this width should be sufficient. =D