NB-IoT Module Series
BC66 Hardware Design
BC66_Hardware_Design 37 / 59
“*” means under development.
4.3. RF Antenna Reference Design
BC66 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 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.
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