Additional EMI cage will not give much of improvement. The module is shielded already and EMI coupling will eventually go from antenna to antenna. This can obviously not be shielded, but placement will make a difference. If possible, the best approach is to have the module on each side of the board and separated with a solid ground plane.
Last Update: August 8, 2017
December 20, 2016 1329 RC232 Q&A