RF-based dynamic remote control device based on generating and sensing of electrical field in vicinity of the operator

摘要

Circuitry in a wireless remote control apparatus applies a signal to a sensor plate of the device and detects the field, e.g. to sense a parameter related to the field that is responsive to relative position of a part of the body of the operator. In the example, the field generation and sensing are performed during a first time slice. During a second time slice, a reference voltage is applied to the plate, and a transmitter sends a signal via an antenna representing the sensed field state. During the first time slice, however, there is no transmission from the antenna, and the antenna functions as a shield with respect to a lead connecting the circuitry to the plate. The antenna comprises a coaxial conductor around a portion of the electrical lead, and a dielectric material separates the electrical lead and the antenna. The example takes the form of a ring.