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4.1.2. Antenna Reference Design
BC65 provides an RF antenna pad for external NB-IoT antenna connection.
The RF trace on the host PCB connected to the module's RF antenna pin should be coplanar
⚫
waveguide or microstrip, whose characteristic impedance should be close to 50 Ω.
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BC65 comes with ground pins which are next to the antenna pin to give a better grounding.
⚫
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 0 Ω resistor is mounted on R1.
Reference design for the NB-IoT antenna interface is shown as below.
Figure 23: Reference Design for NB-IoT Antenna Interface
4.1.3. Antenna Requirements
To minimize the loss on RF trace and RF cable, pay attention to the antenna design. The following tables
show the requirements for the antenna.
Table 18: Antenna Cable Insertion Loss Requirements
Frequency Range
703–960 MHz
1710–2170 MHz
BC65_Hardware_Design
GND
RF_ANT
GND
Module
BC65 Hardware Design
R1 0 Ω
C1 NM
C2 NM
Requirements
Cable insertion loss: < 1 dB
Cable insertion loss: < 1.5 dB
NB-IoT Module Series
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