Reproduction forbidden without Fibocom Wireless Inc. written authorization - All rights reserved.
FIBOCOM MC610 Series Hardware Guide 54/70
4.6 Antenna Design
1. Antenna Requirements
Antenna efficiency is the ratio of antenna input power to radiation power. Because of the return loss,
material loss, coupling loss and radiation power of the antenna are lower than the input power, it is
recommended that the antenna should be more than 40% (-4 dB).
2. S11 or VSWR
S11 shows the matching degree of 50 Ω impedance of the antenna, which affects the antenna
efficiency to a certain extent. The VSWR test can be used to measure this index. S11 < - 10 dB is
recommended.
3. Polarization
Polarization is the rotation direction of the electric field in the maximum radiation direction of the
antenna.
Linear polarization is recommended.
4. Radiation Pattern
Radiation pattern refers to the intensity of electromagnetic field in all directions of far-field. Half wave
dipole antenna is the most suitable terminal antenna. If it is a built-in antenna, it is recommended to
use PIFA antenna or IFA antenna:
Antenna area: 6 mm (height) × 10 mm (width) × 100 mm (length).
Antenna radiation direction: Omni _ Directional.
5. Gain and Directivity
The directivity of antenna refers to the electromagnetic field strength of electromagnetic wave in all
directions. Gain is the combination of antenna efficiency and antenna directivity.
The recommended antenna gain is ≤ 2.5 dBi
6. Interference
In addition to the antenna performance, other interference on the PCB board will also affect the
module performance. In order to ensure the high performance of the module, the interference must
be well controlled. Suggestions: for example, LCD, CP, FPC wiring, audio circuit, power supply part
should be as far away from the antenna as possible, and the corresponding isolation and shielding,
To Next Page
Loading...
Need help?
General
