Sierra Wireless airlink es440, Hardware User'S Manual

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AirLink ES440 Hardware User Guide
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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 Frequenc
y (Hz)
Wavelength
(mm)
Best
Separation
(> mm)
Good
Separation
(>mm)
Reduced
Service
Separation
(> mm)
4G LTE 700 428 214 107 64
4G LTE 800 375 187 94 56
4G LTE 900 333 167 83 50
4G LTE 1800 167 83 42 25
4G LTE 2100 143 71 36 21
4G LTE 2600 115 58 29 17
3G WCDMA HSPA 850 353 176 88 53
3G WCDMA HSPA 900 333 167 83 50
3G WCDMA HSPA 1900 158 79 39 24
3G WCDMA HSPA 2100 143 71 36 21