Sensor module with glass plate

Hi everybody! I made a sensor module (resistor + capacitor + plate). The module is working. When I put a glass plate 4 mm thick on the plate, my sensor module stops working. How to make the sensor module work when the plate is covered with a glass plate?

Is this a follow-up of this thread.

Show us a picture of your sensor area.
Did you add a ground plane, as mentioned in post#6.
Leo..

I don't quite understand what that means. Where to connect what?

Google "ground plane for touch sensor", and go to images.
Leo..

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