Specifications

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4.3. PCB Antenna
Please refer to Fig 2 for PCB antenna.
Fig 2 BL3358-P Antenna layout
The module support PCB antenna in 2.4G~2.5G frequency with S11 port less than -10dB and
max gain of 1.5dBi at 2.45GHz, as shown in Fig 3.
Fig 3 Simulated radiation pattern of antenna gain
Please refer to Fig 4 for real testing environment for module antenna.
Fig 4 Antenna testing environment