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LPM2100 bg NB Module Hardware Usage Guide
Chapter 4. Overall RF technical indicators
4.1 Chapter overview
The LPM2100 bg series module RF overall technical specifications include the following
sections：
Antenna design;
RF PCB design;
RF connector
working frequency
Conducted transmission power and receiving sensitivity;
RF power consumption characteristics.
4.2 Antenna design
4.2.1 Main antenna
The main antenna interface is provided on pin 53 of the LPM2100 bg series module. In
the circuit design, the trace between the module and the antenna must be guaranteed to 50
ohms.
The antenna is a sensitive device that is susceptible to the external environment. For
example, module size, antenna position, footprint size, and surrounding grounding can all
affect antenna performance.
The module antenna pins are defined as follows：
Pin
Pin name
53
RF_ANT
The 53-pin of the LPM2100 bg series module is the main antenna interface. To facilitate
the debugging of the antenna, it is necessary to add a π-type matching circuit to the
motherboard, and take the 50-ohm impedance line. The recommended circuit is as follows：
Shanghai Yuge Information Technology Co., Ltd.
Table 4-1 RF Pin Definitions
IO
Functional description
IO
Main antenna interface
Remarks
50Ωcharacteristic impedance
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