Bluetooth Audio Module
Figure 19: Clearance area of antenna
9.1
Feed Line and Antenna
The impedance of the feed line between the RF port and the antenna shall be 50Ω.
A good ground directly under the feed line is always needed for impedance control.
Route the feed line as curve lines when needed, avoid 90 or even less degree angles style.
The width of the feed line, the distance of the feed line to the ground plane are keys to the
impedance. Ask your PCB supplier to control the impedance of the feed line.
For the antenna,
When PCB antenna is used, matching networks shall be used to optimize the antenna’s
signal strength.
Use as many vias as possible to connect the ground planes nearby the antenna.
Shanghai Ehong Technologies Inc
Summary of Contents for EH-MB05
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