NRF24L01+ RF Trace Width

[Alexandros]

Hi, 

I have a question regarding the width of the RF traces on the NRF24L01+.  From the gerbers I notice the width is approximately 0.5mm and the separation to the closest ground plane is approximately 1.2mm.  What is the purpose of this and how does this achieve a 50 Ohm impedance?  

Would it not be better to use a Coplanar Waveguide with trace width 1.1mm, plane clearance of 0.2mm and a distance from top to bottom layer of 1.55mm for a 2-layer board?  Please advise as soon as possible.  

Thanks, 

Alex

[ketiljo]

The impedance between the components isn't 50 ohm. It's more important to keep the series inductance low. The cutout in the ground plane is to reduce parasitic capacitance to ground. 

[Alexandros]

Thanks for clarifying. 

[Quangca]

you can refer to thí website for calculate impedance:

chemandy.com/.../coplanar-waveguide-with-ground-calculator.htm