Antenna Separation Recommendations - Sierra Wireless AirLink ES440 Hardware User's Manual

AirLink ES440 Hardware User Guide
30

Antenna Separation Recommendations

Inadequate antenna separation between the primary and secondary antennas
creates unwanted interference that can cause reduction in:
• Antenna efficiency
• Transmit power
• Receiver sensitivity
• Data throughput
• Radio front-end life span
Antenna separation recommendations:
• The antennas should be separated so that there is at least 10dB isolation
over the entire operating frequency range.
• The separation should be at least 0.25 wavelength (preferably greater than
0.5 wavelength) of the lowest operating frequency.
Note: If the separation is less than 0.25 wavelength, increase it to at least 0.25 wavelength
(preferably greater than 0.5 wavelength) of the lowest operating frequency.
• In confined spaces, a separation of 0.15 wavelength is possible, but this will
result in reduced network coverage.
• The recommended separation is only an approximate value for monopole or
dipole type antennas.
Sierra Wireless recommends the following antenna separation:
Table 3-1: Recommended Antenna Separation
Service
4G LTE
4G LTE
4G LTE
4G LTE
4G LTE
4G LTE
3G WCDMA HSPA
3G WCDMA HSPA
3G WCDMA HSPA
3G WCDMA HSPA
Frequenc Wavelength
y (Hz) (mm) Separation
700 428
800 375
900 333
1800 167
2100 143
2600 115
850 353
900 333
1900 158
2100 143
Best Good Reduced
Separation Service
(> mm) (>mm) Separation
(> mm)
214 107
187 94
167 83
83 42
71 36
58 29
176 88
167 83
79 39
71 36
4114607
64
56
50
25
21
17
53
50
24
21