I'm using Atmel's ATMEGA256RFR2 (link) for Zigbee (802.15.4).
However I could not reach more than a few meters of range between my nodes.
Here is the antenna design layout and schematics I'm using, could you find any defects in these design? Reaching 4-5 meters range with Zigbee sounds really weird to me as theses systems usually can do hundreds of meters for communication ranges.
Antenna type: 2450AT18A100.
here is my new design, 50Ohm matching is not yet done, but I'm unsure about the VIAs around the antenna:
On the right there is no more space to have them. Is it a problem?
Are they close enough to each other? Distance between their centers are around 1.8mm.
I have just make the board soldered however now the situation is a lot worse than before: the board is not able to connect to the Coordinator at all.
Even if I put it close the the Coordinator it does not connect.
So I believe something went wrong with this design again.
What shall be trivial to check to have at least a little chance to make these boards work?