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