Quectel UC20

UMTS/HSPA Module Series
UC20 Hardware Design
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5 Antenna Interface
UC20 antenna interface includes a main UMTS antenna, an optional UMTS Rx-diversity antenna, which
is used to improve UMTS’s receiving performance, and a GNSS antenna. The antenna interface has an
impedance of 50Ω.
5.1. UMTS Antenna Interface
5.1.1. Pin Definition
The main antenna and UMTS Rx-diversity antenna pins definition are shown below.
Table 25: Pin Definition of the RF Antenna
Pin Name
Pin No.
I/O
Description
Comment
ANT_MAIN
49
IO
Main antenna
50Ω impedance
ANT_DIV
35
AI
Diversity antenna
50Ω impedance
5.1.2. Operating Frequency
Table 26: The Module Operating Frequencies
Band
Receive
Transmit
Unit
UMTS 1900
1930 ~ 1990
1850 ~ 1910
MHz
UMTS 850
869 ~ 894
824 ~ 849
MHz
5.1.3. Reference Design
The reference design of main antenna and UMTS Rx-diversity antenna is shown as below. It should
reserve a π-type matching circuit for better RF performance. The capacitors are not mounted by default.