GSM/GPRS/GNSS Module Series
MC60 Series Hardware Design
MC60_Series_Hardware_Design Confidential / Released 86 / 114
4.2.2. Active Antenna
The following figure is a typical reference design with active antenna. In this mode, the antenna is
powered by GNSS_VCC.
GNSS_VCC
Active Antenna
L1 47nH
R2 10R
GNSS_ANT
C1 NM
C2 NM
R1
П matching circuit
0R
Module
Figure 51: Reference Design with Active Antenna
C1, R1 and C2 are reserved matching circuit for antenna impedance modification. By default, C1 and C2
are not mounted; R1 is 0Ω.
The external active antenna is powered by GNSS_VCC. The voltage ranges from 2.8V to 4.3V, and the
typical value is 3.3V. If the voltage does not meet the requirements for powering the active antenna, an
external LDO should be used.
The inductor L1 is used to prevent the RF signal from leaking into the GNSS_VCC pin and route the bias
supply to the active antenna, and the recommended value of L1 is no less than 47nH. R2 can protect the
whole circuit in case the active antenna is shorted to ground.
GPS frequency: 1575.42±2MHz
GLONASS frequency: 1602±4MHz
VSWR: <2 (Typ.)
Polarization: RHCP or Linear
Noise figure: <1.5dB
Gain (antenna): > -2dBi
Gain (embedded LNA): 20dB (Typ.)
Total gain: >18dBi (Typ.)
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