LTE-A Module Series
EG18 Hardware Design
EG18_Hardware_Design 74 / 104
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 reser
ve 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.
ANT_MAIN
R1 0R
C1
Module
Main
Antenna
NM
C2
NM
R3 0R
C5
MIMO
Antenna
NM
C6
NM
ANT_DIV
R2 0R
C3
NM
C4
NM
ANT_MIMO1
C7
NM
C8
NM
ANT_MIMO2
MIMO
Antenna
Diversity
Antenna
R4 0R
Figure 36: Reference Circuit of RF Antenna Interfaces
Please keep a proper distance between the main antenna and the Rx-diversity antenna to improve the
receiving sensitivity.
LTE B30
2305~2315
2350~2360
MHz
LTE B41
2496~2689.9
2496~2689.9
MHz
LTE B66
1710~1780
2110~2200
MHz
LTE B71
617~652
663~698
MHz
NOTE