Quote Originally Posted by jellis00 View Post
Dave, I am in process of developing an embedded MCU application that will use the ConnectOne Mini iWiFi module. However, your use of the term "ethernet sheild" confuses me.
"Shield" is the term used for all of the boards designed to interface with the Arduino and its many clones - its derivation is a mystery to me.. So, yes, my ConnectOne shield is designed to work with Arduino system boards. You can see JPGs of my various shield layouts on my web site.

I usually leave as much copper as possible, both to help reduce EMI and to make the acid etchant last longer. Since the mini uses an external antenna, you will not need the clear area I provided for the onboard patch antenna of the nano.

Unless your application is a one-off design, it might be worth while to buy their evaluation board both for testing and to see how they handle the ground plane.