I have a 2 layers PCB that I mount a Wi-Fi module. Components (SMD) are placed on the bottom layer and the Wi-Fi module is on the top layer.
I apply ground plane on both layers, as I read, it is good for the EMC compatibility. I know multiple layer design is even better, but now I need to have only 2 layers design.
I wonder if the ground plane might interfere or disturb the RF signal or block the signals coming from the other part of the board?
In this sense, is it fine to keep the ground plane on the both layers or make some holes on the PCB to prevent Farady's cage kinds effects?
Edit: here is the link of datasheet of the WiFi module http://www.zcomax.com/embedded/ZCN-722M/ZX-ZCN-722M-DS.pdf but it is a very simple one
Best Answer
This is a 2014 post, but I just run into it. I cannot view the datasheet link for the wifi module, but I'm working on a design using BLE module (Silabs BGM111). On manufacturing datasheet, the layout recommendation should also apply to a wifi module. To answer the original questions, I don't think copper would block signal completely, but it will degrade the signal strength. Depending on your module antenna design, this copper/plastic clearance in 3D space can be different as well.