A
Rev 6 Mar.13
Proprietary and Confidential - Contents subject to change
65
A: Antenna Specification
This appendix describes recommended electrical performance
criteria for main path, diversity path, and GPS 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.
Table A-1: Antenna requirements
a
Parameter
Requirements
Comments
Antenna system
External multi-band 2x2 MIMO
antenna system (Ant1 / Ant2)
b
If Ant2 includes GPS, then it must also satisfy
requirements in
Operating bands of Ant1
and Ant2
c
700–960 MHz
1710–1990 MHz
2110–2170 MHz
2500–2700 MHz
VSWR of Ant1 and Ant2
1:1 (ideal)
< 2.5:1 (recommended)
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.
Radiation patterns of Ant1
and Ant2
Nominally Omni-directional
radiation pattern in azimuth plane.
