Abstract: Devices, systems and methods for magnetic field coupling, as described herein, optimize magnetic coupling between transducers generating and detecting quasistatic magnetic fields by translating the generated and detected magnetic fields into a common frame of reference, such as the Earth's gravitational field. In general, a receiving device has knowledge of the strength and direction of a quasistatic magnetic field generated by a transmitting device, which allows the generated magnetic field to be measured and interpreted by the receiving device in the context of the common frame of reference. Such devices, systems, and methods may use magnetic coupling, for example, for proximity detection and/or for communication between devices. Magnetic coupling may be used for proximity detection, for example, by detecting a magnetic field having a defined magnetic field range and/or by measuring magnetic field strength and/or direction and determining distance and/or location.

Abstract: Systems and methods for sensing and tracing proximity contacts use a magnetic field detection or coupling technology where the detection range between proximate devices may be accurately determined. The detection range may be accurately determined, for example, by generating and detecting a defined magnetic field range and/or by measurement of the received magnetic field strength and direction within an undefined magnetic field range. Proximity sensing devices perform a proximity magnetic field detection when located within a defined, generated magnetic field during a proximity contact interaction with another device that is generating a magnetic field. The magnetic fields generated and detected are generated to behave as quasistatic fields, in contrast to radios that generate and detect radiated, dynamic, electro-magnetic fields.