Radiofrequency-wave-transparent capacitive sensor pad
First Claim
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1. An electronic device for transmitting radiofrequency waves comprising:
- a capacitive sensor pad configured to detect proximity of a body outside the electronic device and to permit the radiofrequency waves to pass through the capacitive sensor pad; and
a radiofrequency antenna overlapping the capacitive sensor pad and configured to transmit the radiofrequency waves through the capacitive sensor pad.
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Abstract
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.
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Citations
20 Claims
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1. An electronic device for transmitting radiofrequency waves comprising:
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a capacitive sensor pad configured to detect proximity of a body outside the electronic device and to permit the radiofrequency waves to pass through the capacitive sensor pad; and a radiofrequency antenna overlapping the capacitive sensor pad and configured to transmit the radiofrequency waves through the capacitive sensor pad. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method comprising:
constructing a capacitive sensor pad that is overlapping a radiofrequency antenna, the radiofrequency antenna being positioned to transmit radiofrequency waves through the capacitive sensor pad, the capacitive sensor pad being configured to detect proximity of a conducting body and to permit the radiofrequency waves to pass through the capacitive sensor pad. - View Dependent Claims (13, 14, 15, 16)
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17. An electronic device for transmitting radiofrequency waves comprising:
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a capacitive sensor pad configured to detect proximity of a body outside the electronic device and to permit the radiofrequency waves to pass through the capacitive sensor pad; a first surface of a dielectric adjacent to the capacitive sensor pad; and a second surface of the dielectric adjacent to an antenna, the antenna overlapping the capacitive sensor pad and configured to transmit the radiofrequency waves through the capacitive sensor pad. - View Dependent Claims (18, 19, 20)
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Specification