Feasibility Study of Antenna Integrated Capacitive Sensor in Operational Mobile Phone

An antenna integrated sensor implementation for hand or finger proximity recognition is developed. Capacitive sensor was installed on the antenna of functional Nokia 6021 phone. The sensitivity of the phone with planar inverted F antenna (PIFA) integrated sensor was measured with active TRP (total radiated power) and TIS (total isotropic sensitivity) measurements. Phone active measurements were performed with/without data cables and compared to reference phones. Passive cable phone measurements were compared with active measurement results. TRP results had no significant decrements due to integration compared with the reference phone. Some TIS channels suffered from detrimental effects due to interfering signals, which were measured with a spectrum analyzer.