Manual

ZED-F9T-Integration manual
Figure 33: u-blox low cost dual-band antenna internal structure
A suitable ground plane is required for the antenna to achieve good performance.
Location of the antenna is critical to reach the stated performance. Unsuitable locations
could include, under vehicle dash, rear-view mirror location, etc.
Dual band active antenna required specifications
Parameter Specification
Antenna type Active antenna
Minimum active antenna gain
2
17 dB
Maximum active antenna gain
2
50 dBActive antenna recommendations
Noise figure <4 dB
L1 band antenna gain
3
1559 - 1606 MHz: 3 dBic typ.
L2/E5b band antenna gain
3
1197 - 1249 MHz: 2 dBic typ.
Polarization RHCP
Axial ratio 2 dB max, at Zenith
Phase center variation <10 mm over elevation/azimuth
Group delay variation in-band
4
10 ns max at each GNSS system bandwidth. Note:
Inter-signal requirement 50 ns max.
EMI immunity out-of-band
5
30 V/m
Out-of-band
4
rejection
40 dB typ
ESD circuit protection 15 kV human body model air discharge
Table 26: Antenna specifications for ZED-F9T modules
The antenna system should include filtering to ensure adequate protection from nearby
transmitters. Take care in the selection of antennas placed close to cellular or Wi-Fi transmitting
antennas.
4.4.1 Antenna bias
Active antennas have an integrated low-noise amplifier that contributes an additional current of
typically 5 to 20 mA to the system's power consumption budget.
2
Including passive losses (filters, cables, connectors etc.)
3
Measured with a ground plane d=150 mm
4
GNSS system bandwidths: 1559… 1563 MHz; 1573… 1578 MHz; 1598… 1606 MHz; 1192… 1212 MHz; 1197… 1217
MHz; 1223… 1231 MHz; 1242… 1249 MHz
5
Exception L1 and L2 bands +/- 200 MHz, emphasis on cellular bands
UBX-19005590 - R05
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4 Design Page 66 of 87
C1-Public Early production information