RCB-F9T - Integration manual
Parameter
Specification
L2/E5b band antenna gain
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
10 ns max at each GNSS system bandwidth. Note:
Inter-signal requirement 50 ns max.
EMI immunity out-of-band
30 V/m
rejection
40 dB typ
ESD circuit protection
15 kV human body model air discharge
Table 15: Antenna specifications for RCB-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 EOS/ESD precautions
When integrating GNSS receivers into wireless systems, careful consideration must be given to
electromagnetic and voltage susceptibility issues. Wireless systems include components which
can produce Electrostatic Discharge (ESD), Electrical Overstress (EOS) and Electro-Magnetic
Interference (EMI). CMOS devices are more sensitive to such influences because their failure
mechanism is defined by the applied voltage, whereas bipolar semiconductors are more susceptible
to thermal overstress. The following design guidelines are provided to help in designing robust yet
cost-effective solutions.
To avoid overstress damage during production or in the field it is essential to observe strict
EOS/ESD/EMI handling and protection measures.
To prevent overstress damage at the RF_IN of your receiver, never exceed the maximum
input power as specified in the u-blox RCB-F9T Data sheet [
].
4.4.1 ESD protection measures
GNSS receivers are sensitive to Electrostatic Discharge (ESD). Special precautions are
required when handling. Most defects caused by ESD can be prevented by following strict
ESD protection rules for production and handling. When implementing passive antenna
patches or external antenna connection points, then additional ESD measures as shown in
the figure below can also avoid failures in the field.
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
6
GNSS system bandwidths: 1559… 1563 MHz; 1573… 1578 MHz; 1598… 1606 MHz; 1192… 1212 MHz; 1197… 1217
MHz; 1223… 1231 MHz; 1242… 1249 MHz
UBX-19003747 - R04
4 Design
Page 45 of 54
Early production information
