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AirPrime EM7690 Hardware Integration Guide
3.7.2.
Recommended GNSS Antenna Specifications
Table 3-7
GNSS Antenna Requirements
Parameter
Frequency Range
Field of View (FOV)
Polarization (Average
Gv/Gh)
Free Space Average
gain (Gv+Gh) over
FOV
Gain
Average 3D Gain
Isolation between
GNSS and ANTx for
WWAN Tx
Typical VSWR
Polarization
Note:
GNSS active antenna is forbidden to use.
411139xx15
Requirements
Wide-band GNSS: 1559–1606 MHz
recommended
Narrow-band GPS: 1575.42 MHz ± 2 MHz
minimum
Narrow-band Galileo: 1575.42 MHz ± 2 MHz
minimum
Narrow-band BeiDou: 1561.098 MHz ± 2 MHz
minimum
Narrow-band GLONASS: 1601.72 MHz ± 4.2
MHz minimum
Narrow-band QZSS: 1575.42 MHz ± 2 MHz
minimum
Omni-directional in azimuth
-45° to +90° in elevation
>0 dB
> -6 dBi (preferably > -3 dBi)
Maximum gain and uniform coverage in the
high elevation angle and zenith.
Gain in azimuth plane is not desired.
> -5 dBi
> 15 dB in all uplink bands and GNSS Rx
Bands
< 2.5:1
Any other than LHCP (left-hand circular
polarized) is acceptable.
Rev
0.31
RF Specifications
Comments
Vertical linear polarization is
sufficient.
Gv and Gh are measured and
averaged over -45° to +90° in
elevation, and ± 180° in azimuth.
September 23, 2020
17
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