Product Info
Table Of Contents
- About the Document
- Contents
- Table Index
- Figure Index
- 1Introduction
- 2Product Concept
- 3Application Interfaces
- 4Antenna Interface
- 5Reliability and Electrical Characteristics
- 6Mechanical Features
- 7Storage, Manufacturing and Packaging
- 8Appendix A References
NB-IoT Module Series
BC660K-GL Hardware Design
BC660K-GL_Hardware_Design
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4.3. RF Antenna Reference Design
BC660K-GL provides an RF antenna pin 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 50 Ω.
The module comes with ground pads which are next to the antenna pad 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 0 Ω resistor is mounted on R1.
A reference design of the RF interface is shown as below.
B17 734–746 MHz 704–716 MHz
B18 860–875 MHz 815–830 MHz
B19 875–890 MHz 830–845 MHz
B20 791–821 MHz 832–862 MHz
B25 1930–1995 MHz 1850–1915 MHz
B28 758–803 MHz 703–748 MHz
B66 2110–2180 MHz 1710–1780 MHz
B70 1995–2020 MHz 1695–1710 MHz
B85 728–746 MHz 698–716 MHz