Hi,
I am designing a miniature helical PCB antenna for 868Mhz according to the "design note DN038". Due to the space limit and to get more ground area the antenna area is only 21mm x 13mm. The size of the PCB is 36mm x 43mm.
The DN038 does not have the information on how far the designed board can transmit. Could you tell me if the board with the miniature helical PCB antenna can transmit over 200 meters in open area if the RF setting is 2-GFSK/175kBaud/ 868Mhz?
Below are the PCB layout and part of the schematic.
Thanks,
Derong Yuan
top side:
bottom side
part of the schematic:
