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Category
Polarization
LTE Antenna Diversity
Antenna diversity uses two receive antennas to improve the downlink connection (cell tower to mobile). It has no
effect on the uplink (mobile to cell tower).
Antenna diversity is useful in environments where the signal arrives at the device after bouncing off or around
buildings or other objects. The bounced signal may be attenuated by going through semi-transparent (to the
signal) objects. Each signal alteration can change its magnitude, phase, orientation, or polarization. This complex
environment can exist in cities, inside buildings or in traffic. In this environment, signal paths from the cell tower
form an interference pattern of peaks and nulls. These peaks and nulls can be very close together.
Antenna diversity provides an advantage in complex environments because if one receive antenna has a poor
signal due to an interference null pattern, the other antenna is likely not in the null and has better reception. The
radio compares the reception from both receive antennas and uses the one with the strongest signal.
Important:
You must deploy with two antennas, unless your carrier has authorized you to deploy with one
antenna.
Selecting Antennas
Select an antenna based on your product and application. Typically, both antennas are the same and either can be
the main receive antenna.
Antenna Approvals and Safety Considerations
Note the following:
Carriers conduct antenna diversity tests.
There are no EMC concerns about antenna diversity.
All antennas need to have a minimum flammability rating.
Safety requirements depend on your final product.
Unless otherwise noted, antennas certified by MultiTech are not approved for outdoor use. Do not extend
these antennas outside of any building.
Diversity and Power Draw
There are no significant power draw differences.
OEM Integration
FCC & IC Information to Consumers
The user manual for the consumer must contain the statements required by the following FCC and IC regulations:
47 C.F.R. 15.19(a)(3), 15.21, 15.105 and RSS-Gen Issue 4 Sections 8.3 and 8.4.
FCC Grant Notes
The OEM should follow all the grant notes listed below. Otherwise, further testing and device approvals may be
necessary.
®
SocketModem
Cell MTSMC-L4G1 Device Guide
Description
Linear, vertical
ANTENNAS
19
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