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Capacitive Sensor Arrangement to Detect External Load on a Mobile Terminal Antenna
Progress In Electromagnetics Research Letters, Vol. 15, 13-18, 2010
The feasibility of using a capacitive sensor to sense the proximity of an external load, especially a finger, to a mobile terminal antenna was experimentally studied using a PIFA-type antenna as one of the sensor's electrodes. It was found that with the proposed arrangement it is possible to detect objects with permittivity close to that of body tissue or the conductivity level of aluminium and the size of a human finger at distances up to 15 mm.
Arttu Huttunen, Sami Myllymaki, Mikko Komulainen, and Heli Jantunen, "Capacitive Sensor Arrangement to Detect External Load on a Mobile Terminal Antenna," Progress In Electromagnetics Research Letters, Vol. 15, 13-18, 2010.

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