Technical Specs

Rev 3 Oct.20 58 41113694
A
A: Antenna Specification
This appendix describes recommended electrical performance criteria for main path,
diversity path, and GNSS antennas used with AirPrime embedded modules.
The performance specifications described in this section are valid while antennas are
mounted in the host device with antenna feed cables routed in their final application
configuration.
Note: Antennas should be designed before the industrial design is finished to make sure that the
best antennas can be developed
Recommended Main/Diversity Antenna
Specifications
Table A-1: Antenna Requirements
a
Parameter Requirements Comments
Antenna system
(LTE) External multi-band 2x2
MIMO antenna system (Ant1/
Ant2)
b
(3G) External multi-band antenna
system with diversity (Ant1/Ant2)
c
If Ant2 includes GNSS, then it must also satisfy
requirements in Table A-2 on page 60.
Operating bands —
Antenna 1
All supporting Tx and Rx frequency
bands.
Operating bands —
Antenna 2
All supporting Rx frequency bands,
plus GNSS frequency bands if
Antenna 2 is used in shared
Diversity/MIMO/GNSS mode.
VSWR of Ant1 and Ant2
• < 2:1 (recommended)
• < 3:1 (worst case)
On all bands including band edges
Total radiated efficiency of
Ant1 and Ant2
> 50% on all bands
• Measured at the RF connector.
• Includes mismatch losses, losses in the
matching circuit, and antenna losses,
excluding cable loss.
• Sierra Wireless recommends using
antenna efficiency as the primary
parameter for evaluating the antenna
system.
Peak gain is not a good indication of
antenna performance when integrated
with a host device (the antenna does not
provide omni-directional gain patterns).
Peak gain can be affected by antenna
size, location, design type, etc.—the
antenna gain patterns remain fixed unless
one or more of these parameters change.