GSM/GPRS/NB-IoT Module Series
BC68&M66 Compatible Design
BC68&M66_Compatible_Design 22 / 31
4.9. RF Antenna Interface
RF_ANT and BT_ANT of M66 are compatible to RF_ANT of BC68. The RF antenna interface has an
impedance of 50
Ω. A reference circuit for the interface is shown below. In order to achieve better RF
performance, a π-type matching circuit should be reserved, and
the
π-type
matching components
(R1/C1/C2) should be placed as close the antenna as possible
.
By default, the resistance of R1 is 0
Ω and
capacitors C1 and C2 are not mounted.
RF_ANT
R1 0R
C1
Module
NM
C2
NM
BC68/M66
M66 BT_ANT
Figure 14: Reference Circuit of RF Interface
