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Table A-2: GPS standalone antenna requirements
Frequency range
Field of view (FOV)
Polarization
(average Gv/Gh)
Free space average gain
(Gv+Gh) over FOV
Gain
Average 3D gain
Isolation between GPS and
Ant1
Typical VSWR
Polarization
Rev 6 Mar.13
Proprietary and Confidential - Contents subject to change
Recommended GPS antenna
specifications
Parameter
•
•
•
•
> 0 dB
> -6 dBi (preferably > -3 dBi)
•
•
> -5 dBi
> 10 dB in all uplink bands
< 2.5:1
Any other than LHCP (left-hand
circular polarized) is acceptable.
Antenna tests
The following guidelines apply to the requirements described in
page 65
and
Table A-2 on page
•
Perform electrical measurements at room temperature (+20°C to +26°C)
unless otherwise specified
•
For main and diversity path antennas, make sure the antennas (including
contact device, coaxial cable, connectors, and matching circuit with no more
than six components, if required) have nominal impedances of 50
supported frequency bands.
•
All tests (except isolation / correlation coefficient) —Test the main or diversity
antenna with the other antenna terminated.
Requirements
1575.42 MHz ±2 MHz
minimum
1565–1606 MHz recom-
mended
Omni-directional in azimuth
°
°
-45
to +90
in elevation
Maximum gain and uniform
coverage in the high elevation
angle and zenith.
Gain in azimuth plane is not
desired.
67:
Antenna Specification
Comments
Vertical linear polarization is
sufficient.
Gv and Gh are measured and
°
averaged over -45
to +90
elevation, and 180
° in azimuth.
Table A-1 on
across
°
in
67
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