User's Manual

UMTS/HSPA Module Series
UC20 User Manual
UC20_Hardware_Design Confidential / Released 58 / 84
UMTS 900
925 ~ 960
880 ~ 915
MHz
UMTS 850
869 ~ 894
824 ~ 849
MHz
UMTS 800
875 ~ 885
830 ~ 840
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.
ANT_MAIN
R1 0R
C1
Module
Main
antenna
NM
C2
NM
R2 0R
C3
Diversity
antenna
NM
C4
NM
ANT_DIV
Figure 33: Reference Circuit of Antenna Interface
Keep a proper distance between main antenna and diversity antenna to improve the receiving sensitivity.
NOTE