41110461XXX
Rev 0.1
January 16, 2017
14
Hardware Integration Guide
Introduction
Pad
Name
Direction
Function
BB12
GND
Primary Antenna Ground
BA7
GND
Diversity Antenna Ground
BA8
DIVERSITY_ANT
Input
Diversity Antenna Interface
BA9
GND
Diversity Antenna Ground
BB7
GND
Diversity Antenna Ground
BB8
GND
Diversity Antenna Ground
1.3.4.1.
WWAN Antenna Recommendations
The table below defines the key characteristics to consider for antenna selection.
Table 13.
AirPrime AR758x Series WWAN Antenna Recommendations
Parameter
Requirements
Comments
Antenna system
External multi-band 2x2 MIMO
antenna system (Ant1/Ant2)
a
Operating bands of
Ant1 and Ant2
b
698
–960 MHz
1451
–1512 MHz
1710
–1995 MHz
2110
–2170 MHz
2500
–2700 MHz
Operating bands depend on module
’s
supported bands/modes
VSWR of Ant1 and
Ant2
1:1 (ideal)
< 2.5:1 (recommended)
On all bands including band edges
Total radiated
efficiency of Ant1 or
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.
Maximum antenna
gain
Must not exceed antenna gains due to
RF exposure and ERP/ EIRP limits,
as listed in the module’s FCC grant.
Isolation between
Ant1 and Ant2 (S21)
> 10 dB
If antennas can be moved, test all
positions for both antennas.
Unless otherwise specified, this
isolation requirement need to be
maintained for optimum operation.
Make sure all other wireless devices
(Bluetooth or WLAN antennas, etc.) are
turned OFF to avoid interference.
