Hardware Guide

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FIBOCOM MC116-NA Series Hardware Guide Page 46 of 63
Description Condition Typ.
CN0 GNSS Signal@-130dBm
39dB-HZ（TBD）
Positional
Accuracy
CEP GNSS Signal @-130dBm <3m
7.4.2 GNSS Observes Protocol
MC116-NA series module adopts NMEA-0183 protocol.
7.5 Antenna Design
7.5.1 Antenna Index
1) Antenna efficiency
Antenna efficiency is the ratio of antenna input power to radiated power. Due to the antenna return loss,
material loss, and coupling loss, the radiated power is always lower than the input power. Recommend>
40% (-4dB).
2) S11 or VSWR
S11 shows that the matching degree of the antenna’s 50Ω impedance, to a certain extent, affects the
antenna efficiency. VSWR test methods can be used to measure this parameter. Recommend S11
<-10dB.
3) Polarization
Polarization is the rotation direction of the electric field in the maximum radiation direction of the antenna.
It is recommended to use linear polarization.
4) Radiation pattern
Radiation pattern refers to the antenna’s electromagnetic field strength in the far field in all directions.
Half-wave dipole antenna is the most suitable terminal antenna. For built-in antenna, PIFA antennas or
IFA antennas are recommended:
Antenna area: 6mm high*10mm wide*100mm long.
Antenna radiation direction: Omni_directional (all direction).
5) Gain and directivity
Antenna directivity refers to the electromagnetic field strength of electromagnetic wave in all directions.
Gain is a collection of antenna benefits and antenna directivity.
Recommended antenna gain ≤ 2.5dBi.
6) Interference
In addition to the antenna performance, other interferences on the PCB also affect the performance of
the module. In order to ensure the high performance of the module, interference must be controlled.