RF-BM-BG22B1
Shenzhen RF-star Technology Co., Ltd.
Page 9 of 15
4.3 Antenna
4.3.1 Antenna Design Recommendation
1.
The antenna installation structure has a great influence on the module performance. It is necessary to ensure the
antenna is exposed and preferably vertically upward. When the module is installed inside of the case, a high-quality
antenna extension wire can be used to extend the antenna to the outside of the case.
2.
The antenna must not be installed inside the metal case, which will cause the transmission distance to be greatly
weakened.
3.
The recommendation of antenna layout.
The inverted-F antenna position on PCB is free-space electromagnetic radiation. The location and layout of the
antenna is a key factor to increase the data rate and transmission range.
Therefore, the layout of the module antenna location and routing is recommended as follows:
（
1
）
Place the antenna on the edge (corner) of the PCB.
（
2
）
Make sure that there is no signal line or copper foil in each layer below the antenna.
（
3
）
It is best to hollow out the antenna position in the following figure to ensure that the S11 of the module is
minimally affected.
Figure 6. Recommendation of Antenna Layout
Note: The hollow-out position is based on the antenna used.
4.4 Basic Operation of Hardware Design
1.
It is recommended to offer the module with a DC stabilized power supply, a tiny power supply ripple coefficient, and
reliable ground. Please pay attention to the correct connection between the positive and negative poles of the power
supply. Otherwise, the reverse connection may cause permanent damage to the module;
2.
Please ensure the supply voltage is between the recommended values. The module will be permanently damaged
if the voltage exceeds the maximum value. Please ensure a stable power supply and no frequently fluctuated voltage.
3.
When designing the power supply circuit for the module, it is recommended to reserve more than 30% of the margin,
