Hardware Guide

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FIBOCOM MC116-NA Series Hardware Guide Page 48 of 63
C3
0R
ANT_DIV
Module
NA
DIV
Antenna
ANT_MAIN
MAIN
Antenna
NA
C4
NA
C1
NA
C2
NA
R1
2nH
R2
0R
Figure 7-1 Main and diversity antenna reference circuit
Figure 7-2 is reference design of GNSS antenna.
Figure 7-2 GNSS antenna reference circuit
Note
All matches must be placed close to antenna to make sure the characteristic impedance of
transmission cable is 50.
Since the antenna loss should be less than 0.3dB, keep PCB cable as short as possible.
Keep the PCB LAYOUT straight, and reduce holes on the route to another layer; also avoid
right-angle and acute-angle wiring.
PCB cable should have a good reference ground to avoid other signal cable near the antenna.
Recommend a complete ground level, and use this complete ground level as a reference
ground.