Product Info

LPWA Module Series
BC66-NA Hardware Design
BC66-NA_Hardware_Design 41 / 59
“*” means under development.
4.3. RF Antenna Reference Design
BC66-NA provides an RF antenna pad for external NB-IoT antenna connection.
 The RF trace on host PCB connected to the module’s RF antenna pad should be coplanar
waveguide or microstrip, whose characteristic impedance should be close to 50Ω.
 BC66-NA comes with ground pads which are next to the antenna pad in order to give a better
grounding.
 In order to achieve better RF performance, it is recommended to reserve a π type matching circuit
and place the π-type matching components (R1/C1/C2) as close to the antenna as possible. By
default, the capacitors (C1/C2) are not mounted and a 0Ω resistor is mounted on R1.
A reference design of the RF interface is shown as below.
B17 734MHz~746MHz 704MHz~716MHz
B18 860MHz~875MHz 815MHz~830MHz
B19 875MHz~890MHz 830MHz~845MHz
B20 791MHz~821MHz 832MHz~862MHz
B25 1930MHz~1995MHz 1850MHz~1915MHz
B26* 859MHz~894MHz 814MHz~849MHz
B28 758MHz~803MHz 703MHz~748MHz
B66 2110MHz~2200MHz 1710MHz~1780MHz
B71 617MHz~652MHz 663MHz~698MHz
B85 728MHz~746MHz 698MHz~716MHz
NOTE