4RF Aprisa LTE, User Manual

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56 | LTE Router Installation
Aprisa LTE User Manual 2.1
Antenna Selection
The performance specifications described in this section are valid with the antennas externally installed
and antenna coaxial cables routed to their final locations.
LTE Antenna Requirements
External multi-band 2x2 MIMO antenna systems (Main/Diversity).
Table 4 Antenna 1 and Antenna 2 requirements
Requirement Main Antenna Diversity Antenna
Operating Bands All supporting Tx and Rx frequency
bands. All supporting Tx and Rx frequency
bands. If Ant2 includes GNSS, then it
must also satisfy requirements in
Table 5
VSWR < 2:1 (recommended)
< 3:1 (worst case)
On all bands including band edges
Total radiated
efficiency > 50% on all bands
Measured at RF connector. Includes mismatch & antenna loss but excludes
coaxial loss.
Radiation pattern Nominally Omni-directional radiation pattern in azimuth plane
Envelope correlation
coefficient between
Main and Diversity < 0.5 on Rx bands below 960 MHz
< 0.2 on Rx bands above 1.4 GHz
Mean Effective Gain of
Main and Diversity
(MEG1, MEG2) ≥ -3 dBi
Main and Diversity Mean
Effective Gain
Imbalance
|MEG1 / MEG2| < 2 dB for MIMO operation
< 6 dB for diversity operation
Maximum antenna gain Must not exceed antenna gains due to RF exposure and ERP/EIRP limits, as
listed in the module’s FCC grant. See Table 3 Antenna Compliance
Requirements
Isolation between Main
and Diversity (S21) > 10 dB
Power handling > 1 W (30 dBm)