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FIBOCOM NL668-EAU-MiniPCIe-10 Hardware User Manual
Page 40 of 56
Figure 4-2 Coaxial Cable RF connector Plugs into RF Receptacle
4.6 Antenna Design
4.6.1 Antenna Design Requirement
1) Antenna efficiency
Antenna efficiency is the ratio of antenna input power to emissivity. 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 50 ohm 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
