The present invention relates to a stackable connector for wireless transmission of power between separate devices comprising such a connector of a system, in particular of a patient monitoring system, said separate devices comprising such a connector. The connector comprises a housing (301, 407) and a magnetic coupling unit (302) arranged within the housing (301, 407) for transmitting power to and/or receiving power from another device of the system having a counterpart connector by use of inductive coupling. Said magnetic coupling unit includes a flux concentrator (303, 401, 411, 432, 442), at least part of which having a U-shaped cross-section forming a recess (304, 402, 412, 422, 437, 447) between the legs of the U, a first coil (305, 417, 431) arranged within the recess of the flux concentrator, and a second coil (306, 427, 441) arranged outside of the recess in which the first coil (305, 417, 431) is arranged. The housing (301, 407) is arranged to allow stacking of connectors upon each other so that the first coil (305, 417, 431) of the connector (300, 400, 410, 430) and a second coil of another connector stacked upon the connector together form a transformer for inductive power transmission there between and/or the second coil (306, 427, 441) of the connector (300, 400, 410, 430) and a first coil (305a) of another connector (300a) stacked upon the connector (300, 400, 410, 430) together form a transformer for inductive power transmission there between.

One example discloses a near-field antenna, comprising: a magnetic (H) field antenna; an electric (E) field antenna; wherein the E-field antenna is galvanically insulated from the H-field antenna; and wherein the E-field antenna is configured to be inductively charged by the H-field antenna.

One example discloses a near-field electromagnetic induction (NFEMI) antenna device, having: a coil, having first and second coupling points, configured to generate and/or receive a magnetic (H-field) near-field signal; a conductive structure having first and second coupling points separated by a distance; first and second feed points configured to carry a current from a transmitter and/or to a receiver circuit; wherein the first coupling point of the conductive structure is coupled to the first feed point and wherein the second coupling point of the conductive structure is coupled to the first coupling point of the coil; wherein the second coupling point of the coil is coupled to the second feed point; and wherein the conductive structure is configured to generate an electric (E-field) near-field in response to the current flowing over the distance between the first and second coupling points of the conductive structure.

The present invention relates to a AC-AC converter, which has particular relevance to a converter for an inductive or capacitive (wireless) power transfer system. More specifically, the current invention discloses an AC-AC converter comprising a bridge circuit having a first leg and a second leg, each leg including a high switch and a low switch, the high switches being connected to a first energy source and the low switches being connected to ground, a coupling network(s) having a first connection between the switches of the first leg and a second connection between the switches of the second leg, a second (or multiple secondary) energy source(s) connected between the coupling network(s) and ground.

Various examples are directed to a rotary coupler and methods of use thereof. The rotary data coupler may comprise a transmitter and receiver. The transmitter may comprise a first band and a second transmitter band. The receiver may comprise a receiver housing positioned to rotate relative to the first transmitter band and the second transmitter band. A first receiver band may be positioned opposite the first transmitter band to form a first capacitor and a second receiver band may be positioned opposite the second transmitter band to form a second capacitor. The receiver may also comprise a resistance electrically coupled between the first receiver band and the second receiver band and a differential amplifier. The differential amplifier may comprise an inverting input and a non-inverting input, with the non-inverting input electrically coupled to the first receiver band and the inverting input electrically coupled to the second receiver band.

One example discloses a near-field electromagnetic induction (NFEMI) device configured to be coupled to a non-planar conductive host surface, including: a coil antenna portion configured as a magnetic field antenna; and a conductive antenna surface configured as an electric field antenna; wherein the conductive antenna surface geometrically conforms to the non-planar host surface.

A sensor module for monitoring an asset in an electrical power generation or distribution system includes a module body, a sensor, a sensor near field coupling structure, and an interrogation near field coupling structure. The sensor is supported by the module body, arranged to sense a parameter of the asset and configured to generate a sensor output relating to the parameter. The sensor near field coupling structure is connected to the sensor and supported on a first side of a module body. The interrogation near field coupling structure is supported on a second side of the module body. The sensor output is transmitted from the sensor near field coupling structure to the interrogation near field coupling structure. The sensor module is configured to provide electrical isolation between the asset and a monitoring circuit configured to receive the sensor output through the interrogation near field coupling structure.

A rotary joint has a body with an even number of body segments. Each body segment holds one transmission line with one RF signal connector at one end and a termination at the opposing end. The body segments are oriented such, that alternatingly in neighboring segments two RF signal connectors or two terminations are next to each other. Two neighboring body segments are connected by a carrier plate. The carrier plate holds an electronic housing where two RF signal connectors are located next to each other, and provides a connection to the RF signal connectors.

A phonics learning system, comprising a letter identification board and letter manipulatives that may be placed on the letter identification board by a child, and a computing device connected to the letter identification board that identifies the letters placed on the board, generates a phonetic pronunciation for the combination of letters, and identifies any words or misspelled words.

A wireless repeater system includes an antenna configured to receive a magnetic wake-up signal, a near field communication (NFC) receiver configured to receive a wake-up pattern and compare the received wake-up pattern with a stored wake-up pattern, and an NFC transmitter configured to transmit an output magnetic signal using the stored wake-up pattern to an external device, wherein the transmission of the output magnetic signal is synchronized with the received wake-up pattern to form a superimposed magnetic signal.