LTE Module Series
EC21 Hardware Design
EC21_Hardware_Design Confidential / Released 61 / 94
B12
699~716
729~746
MHz
B13
777~787
746~756
MHz
B18
815~830
860~875
MHz
B19
830~845
875~890
MHz
B20
832~862
791~821
MHz
B26
814~849
859~894
MHz
B28
703~748
758~803
MHz
B40
2300~2400
2300~2400
MHz
5.1.3. Reference Design of RF Antenna Interface
A reference design of ANT_MAIN and ANT_DIV antenna pads 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 31: Reference Circuit of RF Antenna Interface
1. Keep a proper distance between the main antenna and the Rx-diversity antenna to improve the
receiving sensitivity.
2. ANT_DIV
function is enabled by default.
3. Place the
π-type
matching components (R1, C1, C2, R2, C3, C4) as close to the antenna as
possible.
NOTES
Quectel
Confidential
