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FDC2214: Design a proximity sensor which located on the ground surface

David Nguyen18
Prodigy 130 points
Part Number: FDC2214

I am designing a proximity sensor which located on the ground surface. 

i have tried with several method such as 

but the detected distance dramatically decreased when the sensor set on the ground. 

Is there any method to avoid this problem?

Best regards, 

  • 0
    TI__Genius 14270 points
    Hello David,

    You need to reduce the fixed capacitance between the sensor and ground plane. You can use a larger physical sensor or move the ground plane away from the sensor. Consider hatching the ground plane or using a lower dielectric constant material between the sensor and the ground plane.

    Regards,

    ChrisO