L50 Hardware Design
L50_HD_V1.0 -28-
Figure 14: Patch antenna test result
4.2 Design notice
Theoretically the best position for L50 module is not only in the center of PCB not also is on the top
of the PCB, so the radiation plots won’t be skewed due to the effects of placing it close to the edge of
the PCB. The larger the ground-plane is, the higher the gain is in general. And the center frequency of
the antenna will been changed based on the size of the ground-plane. It strongly recommended that the
host PCB is bigger than 80×40mm.
Keep the antenna upside for better performance and remove obstacle between antenna and GPS
satellites. For example, a metal cover should not be used over the antenna.
The evaluation board is as follows.
Quectel
Preliminary