Radiofrequency-wave-transparent capacitive sensor pad

摘要

A capacitive sensor pad is co-located with (e.g., overlapping) an RF transmitter without causing significant degradation to the performance of the antenna. In one implementation, tuning the resistance per square in the capacitive sensor pad can provide effective sensor pad range and performance while providing making the capacitive sensor pad sufficiently transparent to radiofrequency waves to provide excellent antenna efficiency, despite the co-location of the capacitive sensor pad and the antenna.

主权项

1. An electronic device comprising:
a capacitive sensor pad configured to detect proximity of a body outside the device, the capacitive sensor pad transparent to radiofrequency waves and having a resistivity within a range of 40,000 ohms/square to 120,000 ohms/square; and a radiofrequency antenna overlapping the capacitive sensor pad and configured to transmit radiofrequency through the capacitive sensor pad.