HAND GRIP SENSOR FOR EXTERNAL CHASSIS ANTENNA

摘要

A method and system for detecting whether the position of a user's hand gripping a mobile communication device chassis affects an external antenna is provided. A sectioned metal band about a periphery of a mobile communication device has a radiating antenna in at least one metal section. The radiating antenna section is bounded on both sides by electrically floating metal sections. Each of the electrically floating metal sections is bounded on the side distal from the antenna section by a ground metal section. Each metal section separated from an adjacent metal section by an insulating gap. Embodiments measure a differential capacitance between the antenna section and the floating metal section and measure a single and capacitance between the floating metal section and the grounded section to determine whether a user's hand is bridging one or more of the insulating gaps.

主权项

1. n antenna system comprising:
a first antenna; a first metal section spaced by a first gap from a first end of the first antenna; a first ground section spaced by a third gap from the first metal section, the first ground section connected to ground; a capacitance sensor configured to measure a first differential capacitance between the first antenna and the first metal section, when the first differential capacitance exceeds a first differential threshold the capacitance sensor provides a capacitance sense signal indicating that the first gap is being bridged by a user's touch; a matching circuit controller responsive to the capacitance sense signal and configured to provide an impedance control signal to a tunable antenna matching circuit to adjust an impedance between the first antenna and a transceiver based on the first gap being bridged.