Sierra Wireless AirPrime EM7690 Hardware Integration Manual page 16

AirPrime EM7690 Hardware Integration Guide
Parameter
Total Radiated
Efficiency
Radiation Patterns
Envelope
Correlation
Coefficient between
Ant
Mean Effective Gain
of Ant1 and Ant2
(MEG1, MEG2)
Ant1 and Ant2
Mean Effective Gain
Imbalance
| MEG1 / MEG2 |
Maximum Antenna
Gain
Isolation
Power Handling
1. These worst-case VSWR figures for the transmitter bands may not guarantee RSE levels to be within regulatory limits.
The device alone meets all regulatory emissions limits when tested into a cabled (conducted) 50Ω system. With antenna
designs with up to 2.5:1 VSWR or worse, the radiated emissions could exceed limits. The antenna system may need to be
tuned in order to meet the RSE limits as the complex match between the module and antenna can cause unwanted levels
of emissions. Tuning may include antenna pattern changes, phase/delay adjustment, passive component matching.
Examples of the application test limits would be included in FCC Part 22, Part 24 and Part 27, test case 4.2.2 for WCDMA
(ETSI EN 301 908-1), where applicable.
2. Ant1 - Primary, Ant2 - Secondary (Diversity/GNSS L1), Ant3 - MIMO1 Rx path, Ant4 - MIMO2 Rx path and GNSS L5.
411139xx15
Requirements
> 50% on all bands
Nominally Omni-directional radiation
pattern in azimuth plane.
 < 0.5 on Rx bands below 960 MHz
 < 0.2 on Rx bands above 1.4 GHz
 -3 dBi
 < 2 dB for MIMO operation
 < 6 dB for diversity operation
Must not exceed antenna gains due to
RF exposure and ERP/ EIRP limits, as
listed in the module's FCC grant.
 >10dB for all antennas at all bands
frequency range.
 >20dB for Ant1 and Ant4 at B41
frequency range.
>1W
Rev 0.31
Comments
 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.
See Important Compliance Information for
the United States and Canada.
 If antennas can be moved, test all
positions for both antennas.
 Make sure all other wireless devices
(Bluetooth or WLAN antennas, etc.) are
turned OFF to avoid interference.
 Measure power endurance over 4 hours
(estimated talk time) using a 1 W CW
signal — set the CW test signal
frequency to the middle of each
supporting Tx band.
 Visually inspect device to ensure there is
no damage to the antenna structure and
matching components.
 VSWR/TIS/TRP measurements taken
before and after this test must show
similar results.
September 23, 2020
RF Specifications
16