User's Manual

FLC-WFM301 Datasheet
Flaircomm Microelectronics Confidential
-23-
8. Recommended PCB Layout and Mounting Pattern
Placement and PCB layout are critical to optimize the performances of a module without on-board
antenna designs. The trace from the antenna port of the module to an external antenna should be 50
and must be as short as possible to avoid any interference into the transceiver of the module. The
location of the external antenna and RF-IN port of the module should be kept away from any noise
sources and digital traces. A matching network might be needed in between the external antenna and
Antenna port to better match the impedance to minimize the return loss.
As indicated in Figure 6 below, RF critical circuits of the module should be clearly separated from
any digital circuits on the system board. All RF circuits in the module are close to the antenna port.
The module, then, should be placed in this way that module digital part towards your digital section
of the system PCB.
Figure 6: Placement the Module on a System Board
8.1 Antenna Connection and Grounding Plane Design
Figure 7: Leave 5mm Clearance Space from the Antenna
General design recommendations are:
 The length of the trace or connection line should be kept as short as possible.