Specifications

Antenna Specification
Rev 6 Mar.13 Proprietary and Confidential - Contents subject to change 67
Recommended GPS antenna
specifications
Antenna tests
The following guidelines apply to the requirements described in Tabl e A-1 on
page 65 and Table A-2 on page 67:
• 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
 across
supported frequency bands.
• All tests (except isolation / correlation coefficient) —Test the main or diversity
antenna with the other antenna terminated.
Table A-2: GPS standalone antenna requirements
Parameter Requirements Comments
Frequency range • 1575.42 MHz ±2 MHz
minimum
• 1565–1606 MHz recom-
mended
Field of view (FOV) • Omni-directional in azimuth
• -45° to +90° in elevation
Polarization
(average Gv/Gh)
> 0 dB Vertical linear polarization is
sufficient.
Free space average gain
(Gv+Gh) over FOV
> -6 dBi (preferably > -3 dBi) Gv and Gh are measured and
averaged over -45
° to +90° in
elevation, and 180
° in azimuth.
Gain • Maximum gain and uniform
coverage in the high elevation
angle and zenith.
• Gain in azimuth plane is not
desired.
Average 3D gain > -5 dBi
Isolation between GPS and
Ant1
> 10 dB in all uplink bands
Typical VSWR < 2.5:1
Polarization Any other than LHCP (left-hand
circular polarized) is acceptable.