I hope that you could help me to understand the following issue:
I am implementing an external antenna interface for both xE910 module (2G GE910 QUAD V3 and 3G HE910-D options).
The antenna detection circuit is also present on the PCB according to Telit’s guideline.
As suggested I placed an AC coupling capacitor (33pF) isolating the xE910’s RF input from the DC source path sinking into the the external antenna path for its detection.
The question is:
Do I gain some advantage in keeping the AC coupling in case of simple direct connection from ext antenna to RF pad? (e.g. when the antenna detection circuit is not populated).
Do I have to add some passive network on RF track in between for ext antenna tuning for getting device certifications?
Basically I would like to find the righ compromise using the minimum number of parts for RF antenna connection in order to optimize RF performance (PCB layout).
Thanks in advance.
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