Sierra Wireless AirLink ES450, Руководство пользователя по оборудованию

Страница: 29 / 53

AirLink ES450 Hardware User Guide
Rev. 7 July 2019 29 4116746
Warning:
In more complex installations (such as those requiring long lengths of cable and/or
multiple connections), you must follow the maximum dBi gain guidelines specified by the radio
communications regulations of the Federal Communications Commission (FCC) or Industry Canada
or
your country’s regulatory body (if used outside the U.S.A.). Also see Important Information for
North American Users on Radiation Exposure on page 44 for more information.
Antenna Separation
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 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 Table 3-1 for
specific recommendations, based on your network type and frequency.
Note: The values in the following table are approximate antenna separation values for monopole or
dipole type antennas.
Table 3-1: Recommended Antenna Separation
Service Frequency
(MHz)
Wavelength (

)
(mm)
Best Antenna
Separation (mm)
(1/2

)
Good Antenna
Separation (mm)
(1/4

)
4G LTE 700 428 214 107
4G LTE 800 375 187 94
4G LTE 900 333 167 83
4G LTE 1800 167 83 42
4G LTE 2100 143 71 36
4G LTE 2600 115 58 29
3G WCDMA HSPA 850 353 176 88
3G WCDMA HSPA 900 333 167 83
3G WCDMA HSPA 1900 158 79 39
3G WCDMA HSPA 2100 143 71 36
3G CDMA/EV-DO 800 375 187 94
3G CDMA/EV-DO 1900 158 79 39