QUESTION

Question

Hi all,
I have a question regarding the PCB design for the antenna Integra SR4L049-l. According to the datasheet a clearance area has to be provided and I assume that there is no copper in the different buried layers and the bottom layer of the PCB. For the 50Ohm trace, I use a coplanar waveguide with a copper layer below the trace (0.2mm substrate thickness). Should the copper in the bottom layer be left out in the clearance area? How to design the area where feed line and clearance area meet? Enclosed is a picture of my current design? Is this correct?

Cheers
Manuel

Answer 1

Hello Manuel,

Yes, your design looks correct in the area near the antenna feed pad. Yes, you will need to clear the copper through all the layers in the same pattern as your top layer. You should also run vias to connect all layers along the perimeter of the open area for the antenna. Yes, the ground layer should be cleared as you have it under the feed trace in the keep out area near the antenna feed pad.

Best regards,

Geoff S.