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11) Instruction for designing PCB and location of parts for the better antenna performance

 

 

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・Antenna resonance frequency shifts towards lower frequency under the influence of the human body. So if AM11DP-ST01 is applied to the remote controller, which mainly works in contact with the human body, the antenna should be tuned under the condition of touching the human body.
・Antenna gain becomes considerably worse when the wireless terminal with AM11DP-ST01 is set close to metallic objects such as a wall or door. Therefore, in this case, wireless terminals should be placed as far as possible from metallic objects.
・In a practical wireless terminal, a circuit board will be enclosed in a case made of plastic. This plastic case has a tendency to make resonance frequency shift lower. In a situation such as this, tuning should be done under conditions where the circuit board is enclosed in a plastic case.
・If the circuit board has a 2 or 3 stage structure and the AM11DP-ST01 is mounted on one of them, not only the mounted antenna PCB but also the other PCB should have GND stripped areas around the AM11DP-ST01 so as not to shield the radiation from the antenna in any direction.

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