A rotating capacitive data link system includes a first body rotatable relative to a second body. The first body has one or multiple circular signal transmission lines with multiple transmission line segments. The second body has multiple circular arranged sets of receiving couplers with multiple receiving couplers. Each of the sets of receiving couplers matches to one of the circular signal transmission lines, such that depending on the relative rotational position or angle between the first body and the second body multiple capacitively coupled paths between the transmission line segments and the receiving couplers of a matching set of receiving couplers exist. A receive signal processor is provided to generate a detailed error or status matrix of transmission errors.

A device includes a first circuit that includes a near-field emission circuit, a second circuit, and a hardware connection linking the first circuit to the second circuit. The hardware connection is dedicated to a priority management between the first circuit and the second circuit. In addition, priority management information can be communicated between a near-field emission circuit and a second circuit. The communicating occurs between a dedicated hardware connection connecting the near-field emission circuit to the second circuit.

Methods, systems, and devices for a functional cover are described. A removable cover (e.g., a functional cover) for a wearable ring device (e.g., a ring wearable) may include one or more electrical components positioned at least partially within the removable cover. In some cases, the functional cover may wireless connect with the ring wearable. The removable cover may further include a first inductive component within the removable cover, where the first inductive component is configured to wirelessly communicate with a second inductive component of the wearable ring device when the removable cover is in a mounted state on the wearable ring device. The first inductive component of the removable cover may be configured to transfer electrical current, data, or both, between the one or more electrical components of the removable cover and one or more additional electrical components of the wearable ring device.

A transaction device includes a transceiver for receiving a first message from a first smart device and a second message from a second smart devices at distances greater than a first distance, a processor for determining a first payload and first identifier for the first smart device from the first message and for determining a second payload and second identifier for the second smart device from the second message, an NFC device for receiving an NFC identifier from a smart device at a distance less than the first distance, wherein the processor is for determining whether the NFC identifier data matches the first identifier data or the second identifier data, for processing the first payload when the NFC identifier matches the first identifier data, and for processing the second payload when the NFC identifier matches the second identifier data.

A driver device for driving at least one lighting device comprises a driving circuit, a control circuit configured to control the driving circuit based on a firmware stored in a memory of the driver device, and a transceiver configured to perform near field communication via an antenna. The control circuit is configured to control the transceiver to detect presence of a passive near field communication tag within range of the antenna. Preferably, the driver device includes the control circuit is configured to control the transceiver to acquire a data file from the detected passive near field communication tag, and to perform at least one of updating the firmware or controlling the light driving circuit based on the acquired data file.

Various embodiments are directed to dynamically and temporarily adjusting power to an NFC reader of a computing device from a first power level to a second power level based on a feedback mechanism between a contactless card and the computing device. The contactless card may provide a message containing a checksum. The computing device may receive the message and calculate a checksum based on the received message. By comparing these two checksums, it may be determined whether the entire message has been correctly received. If not, the power to the NFC reader may be temporarily increased to allow better communication between the contactless card and the computing device.

A wireless sensor antenna system for a turbomachine including a rotating blade including a passive sensor is disclosed. The wireless sensor antenna system includes an antenna extending continuously along a circumferential interior surface of a casing of the turbomachine that surrounds the rotating blade. The antenna is configured to receive a return wireless signal from the passive sensor. A power transmission element extends along the at least portion of the circumferential interior surface of the casing to power the passive sensor by emitting an electromagnetic signal to power the passive sensor.

A method for low power communication links between wireless devices is described. The method includes establishing, by a first wireless device, a first magnetic communication link to a source wireless device through a human body. The method also includes establishing, by a second wireless device, a second magnetic communication link to the source wireless device through the human body. The method also includes receiving, by the first wireless device via the first magnetic communication link and the second wireless device via the second magnetic communication link, communications from the source wireless device through the human body.

A relay device includes a first communication unit that communicates with an information management apparatus connected to the Internet via a firewall, a second communication unit that performs near field communication with a terminal apparatus, a storage unit that acquires from the information management apparatus, using the first communication unit, information for identifying the terminal apparatus and mode instruction information that is instruction information indicating that an operation is to be performed in a second mode for acquiring data having a larger data amount than in a first mode, and stores the acquired information, and a control unit that in a case where the terminal apparatus connected using the second communication unit is a terminal apparatus that needs to operate in the second mode, performs control so as to transmit mode instruction information for instructing the operation in the second mode, to the terminal apparatus, and transmit data acquired from the terminal apparatus by using the second communication unit, to the information management apparatus by using the first communication unit.

Methods and apparatus for determining the misalignment and mutual coupling between the transmitter coil and receiver coil, with or without an intermediate relay resonator coil, of a wireless power charging system are provided. The determination can be made without using any direct measurement from the receiver circuit. The technic involves exciting the transmitter coil of the wireless power charging system at several frequencies with equal or different input voltage/current, such that the number of equivalent circuit equations is at least equal to the number of unknown terms in the equations. The methods use the knowledge of only the input voltage and the input current of the transmitter coil. This means that the mutual inductance or magnetic coupling coefficient between the transmitter and receiver coils can be determined based on the information obtained from the transmitter circuit and there is no need for any wireless communication from or direct measurements of the receiver circuit.