Antenna Installation; Antenna Separation Recommendations - Sierra Wireless AirLink GX Series Hardware User's Manual

Rev 8 Nov.15

Antenna Installation

Inadequate antenna separation between the transmit and diversity antennas
creates unwanted interactions. This can cause reductions 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 10 dB isolation
over the entire operating frequency range.
• The separation should be at least 1/4 wavelength (), but preferably
1/2 wavelength or greater of the lowest operating frequency. See
specific recommendations, based on your network service type and
frequency.
Note: The values in the table are approximate antenna separation values for monopole or
dipole type antennas.
Table 2-1: Recommended Antenna Separation
Service Frequency
LTE
LTE
LTE
LTE
LTE
LTE
WCDMA
WCDMA
WCDMA
WCDMA
CDMA/EV-DO
CDMA/EV-DO
GSM/GPRS/
EDGE
Wavelength (
(MHz) (mm)
700 428
800 375
900 333
1800 167
2100 143
2600 115
850 353
900 333
1900 158
2100 143
800 375
1900 158
850 353
Installation and Startup
Table 2-1
Best Antenna Good Antenna
Separation (mm) Separation (mm)

(1/2 (1/4
214 107
187
167
83
71
58
176
167
79
71
187
79
176
for

94
83
42
36
29
88
83
39
36
94
39
88
29