ZED-F9P-Integration Manual
UBX-18010802 - R02
8 Design Page 86 of 114
Advance Information
8.3 Antenna
u-blox highlights that the use of an active antenna is a pre-requisite for using the ZED-F9P.
If an active antenna needs to be implemented in an application case, it is recommended
that an OEM active antenna module is used that meets our specification. To implement the
required RF circuitry and source the required components to meet group delay specification
is not a simple process compared to previous L1 only implementation.
Figure 55: u-blox low cost RTK antenna internal structure
A suitable ground plane is required for the antenna to achieve good RTK performance.
Location of the antenna is critical for reaching stated and good RTK performance, not
suitable for under vehicle dash location, rear view mirror location, etc.
L1 + L2/E5b active antenna required specifications
Parameter Specification
Antenna Type Active antenna
Typical gain 30 dB
Maximum gain 40 dBActive Antenna Recommendations
Maximum noise figure 2 dB
L1 band antenna gain
1
1559 - 1606 MHz: 3 dBic typ.
L2/E5b band antenna gain
2
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
3
10 ns max @ each GNSS system bandwidth.
Note: Inter-signal requirement 50 ns max.
EMI immunity out-of-band
4
30 V/m
Out-of-band
5
Rejection
40 dB typ
ESD Circuit Protection 15 kV human body model air discharge
Table 23: Antenna Specifications for ZED-F9P modules
1
Measured with a Ground Plane d=150 mm
2
Measured with a Ground Plane d=150 mm
3
GNSS system bandwidths: 1559… 1563 MHz; 1573… 1578 MHz; 1598… 1606 MHz; 1192… 1212 MHz; 1197…
1217 MHz; 1223… 1231 MHz; 1242… 1249 MHz
4
Exception L1 and L2 bands +/- 200 MHz, emphasis on cellular bands
5
GNSS system bandwidths: 1559… 1563 MHz; 1573… 1578 MHz; 1598… 1606 MHz; 1192… 1212 MHz; 1197…
1217 MHz; 1223… 1231 MHz; 1242… 1249 MHz
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