Reference Design Of Rf Antenna Interfaces - Quectel LTE-A Series Hardware Design

LTE B30
LTE B41
LTE B66
LTE B71

5.1.3. Reference Design of RF Antenna Interfaces

A reference design of ANT_MAIN, ANT_DIV, ANT_MIMO1 and ANT_MIMO2 interfaces is shown as
below. It should reserve a π-type matching circuit for better RF performance. The π-type matching
components (R1/C1/C2, R2/C3/C4, R3/C5/C6, R4/C7/C8) should be placed as close to the antennas as
possible and are mounted according to the actual debugging. C1 to C8 are not mounted and a 0Ω resistor
is mounted on R1 to R4 respectively by default.
NOTE
Please keep a proper distance between the main antenna and the Rx-diversity antenna to improve the
receiving sensitivity.
EG18_Hardware_Design
2305~2315
2496~2689.9
1710~1780
617~652
Module
ANT_MAIN
C1
NM
ANT_DIV
C3
NM
ANT_MIMO1
ANT_MIMO2
Figure 36: Reference Circuit of RF Antenna Interfaces
2350~2360
2496~2689.9
2110~2200
663~698
R1 0R
Main
Antenna
C2
NM
R2 0R
Diversity
Antenna
C4
NM
MIMO
Antenna
R3 0R
C6
C5
NM
NM
MIMO
R4 0R
Antenna
C8
C7
NM
NM
LTE-A Module Series
EG18 Hardware Design
MHz
MHz
MHz
MHz
74 / 104