Specifications
Antenna Specification
Rev 8 Apr.14 Proprietary and Confidential - Contents subject to change 71
Recommended GNSS antenna
specifications
Isolation between Ant1 and
Ant2 (S21)
> 10 dB • 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.
Power handling • > 2 W RF power on low bands
• > 1 W on high bands
• Measure power endurance over 4 hours
(estimated talk time) using a 2 W CW
signal—set the CW test signal frequency
to the middle of the PCS Tx band
(1880 MHz for PCS).
• 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.
a. 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) 50 ohm 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 4.2.16 for GSM (ETSI EN 301 511),
and test case 4.2.2 for WCDMA (ETSI EN 301 908-1), where applicable.
b. Ant1—Primary, Ant2—Secondary (Diversity/MIMO)
Table A-1: Antenna requirements (Continued)
a
Parameter Requirements Comments
Table A-2: GNSS standalone antenna requirements
Parameter Requirements Comments
Frequency range • Narrow-band GPS:
1575.42 MHz ±2MHz minimum
• Wide-band GPS and GLONASS:
1565–1606 MHz recommended
Field of view (FOV) • Omni-directional in azimuth
• -45° to +90° in elevation
Polarization
(average Gv/Gh)
>0dB 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.