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Xplore Technologies Corp. MC7750 Manual Do Utilizador

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A
Rev 4  Sep.11
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.