User's Manual

GSM/GPRS/GNSS Module Series
MC20 Hardware Design
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4 Antenna Interface
MC20 has three antenna interfaces which are used for GSM antenna, GNSS antenna and BT antenna,
respectively. The Pin 41 is the GSM antenna pad; the Pin 15 is the GNSS antenna pad; and Pin 32 is the
BT antenna pad. The RF interface of the three antenna pads has an impedance of 50Ω.
4.1. GSM Antenna Interface
There is a GSM antenna pad named RF_ANT for MC20.
Table 24: Pin Definition of the RF_ANT
4.1.1. Reference Design
The external antenna must be matched properly to achieve the best performance; so the matching circuit
is necessary. A reference design for GSM antenna is shown below.
Figure 37: Reference Design for GSM Antenna
Pin Name Pin No. Description
GND 40 Ground
RF_ANT 41 GSM antenna pad
GND 42 Ground