A system for detecting a specific relative position between a reader and a receiver, including: an inductive contactless receiver including an antenna winding and a circuit for selectively modulating a load; an inductive contactless reader including: a transceiver antenna circuit having nonzero mutual inductance with the antenna winding for the position, a communication circuit connected to the transceiver antenna circuit, a receiver antenna circuit having mutual inductance with the antenna winding that exhibits a minimum for the position, and a processing circuit for: identifying presence of a receiver by detecting nonzero mutual inductance between the transceiver antenna circuit and an antenna winding, and detecting a mutual inductance minimum between the receiver antenna circuit and an antenna winding.

A display panel comprises a pixel array, multiple vertical driving lines, multiple parallel driving lines, and a first induction area. The pixel array comprises multiple pixels. One of the multiple parallel driving lines comprises a first driving line and a second driving line. The first induction area comprises part of the pixels, wherein magnetic field of a first RF antenna passes through the display panel via the first induction area, a first projection area is corresponding to a vertical projection of the first RF antenna on the display panel, and the first induction area is larger than the first projection area. The first driving line and the second driving line are configured to drive a first row of pixels among the part of the pixels, and the first driving line and the second driving line are electrically isolated from each other within the first induction area.

The present disclosure provides a range-finding system capable of data communication. The range-finding system includes a rangefinder for acquiring ranging data, a magnetic ring unit having at least two communication channels, and a data processing and control unit. Each communication channel includes a magnetic ring. The magnetic ring unit transmits the ranging data as downlink data from the rangefinder to the data processing and control unit via one or more of the communication channels.

A reader device is provided having a wider readable area and a table with the reader device. The reader device includes an antenna element communicating with an RFID tag attached to an article, a reader module electrically connected to the antenna element and reading information of the RFID tag through the antenna element, and a case housing the antenna element and the reader module. Moreover, the antenna element includes a first dipole antenna having a first element axis extending in a first direction, and a second dipole antenna having a second element axis extending in a second direction crossing the first direction.

A transmission coil used in a wireless power transmitter includes a first coil, a second coil electrically connected in series with the first coil, and a tap provided at a connection node of the first coil and the second coil, the first coil and the second coil being stacked to at least partially overlap with each other. A transmission antenna includes the transmission coil, a first capacitor and a second capacitor connected in series with the transmission coil, and a switch provided in parallel to a series connection circuit of the second coil of the transmission coil and the second capacitor. A wireless power transmitter includes the transmission antenna and a bridge circuit that drives the transmission antenna. A charger includes the wireless power transmitter.

A resonant antenna for long-range wireless power transfer and communications. The antenna may be powered by a source at a frequency that is resonant for the antenna or harmonic(s) of the resonant frequency. The loop or antenna may be a wire laid out in a physically large network or constitute wiring of a building or other place. The antenna may be placed in a high index material, which results in the antenna to be a physically smaller size for the same electrical size. The antenna may be driven with an electrical power signal. Power may be picked up by another or secondary antenna from the source antenna at the resonant frequency or harmonic(s). Communications may also occur between the antennas. Because of a near-field effect, emanation of electromagnetic fields is primarily limited extensively to just between the antennas. A little stray electromagnetic field exists that others cannot easily intercept.

An electronic device and a housing for the electronic device are provided. The housing includes a metal part. The metal part includes at least one spiral slot formed on the metal part A portion of the metal part which is disposed between an innermost loop and an outermost loop of the spiral slot forms a spiral metal coil by being spaced by the spiral slot. The spiral metal coil is configured as an antenna radiation element electrically connected with an antenna circuit inside the electronic device, and the spiral slot is filled with an insulating material.

A Bluetooth financial card, belonging to the field of information security, and comprising a receiving module, an acquisition module, a first execution module, a selection module, a cardholder verification module, a second execution module, an online transaction message organization sending module, an authorization response receiving module, and a transaction confirmation message organization sending module. The technical solution disclosed in the present invention overcomes the defects that the existing contact-type financial cards and contactless-type financial cards are inconvenient to operate in a transaction process, improving the working efficiency, and also saving on the manufacturing cost. The Bluetooth financial card communicates with an upper computer via Bluetooth, which makes the transaction operation more convenient; and when using a fingerprint verification type of cardholder verification method, the transaction is more convenient and secure.

There are provided an antenna device with improved antenna performance while suppressing a decrease in yield and a decrease in viewability, and a display device including the same. The antenna device includes an antenna substrate, a first antenna pattern formed on a first main surface of the antenna substrate, and a second antenna pattern formed on a second main surface opposite to the first main surface of the antenna substrate. The first antenna pattern and the second antenna pattern are formed such that positions on the front and back of the antenna substrate coincide with each other, and at least a part of the antenna substrate is transparent to transmit an image.

A primary side wireless power transmitter inductively couplable to a secondary side wireless power receiver for supplying power to the wireless power receiver for receiving communications from the secondary side wireless power receiver through the inductive coupling comprises a primary side tank circuit receiving a signal on from the secondary side wireless power receiver. A phase delay or time delay circuit generates a fixed delay clock signal. A sample and hold circuit samples a tank circuit voltage utilizing the fixed phase or time delayed clock signal. A comparator is coupled to an output of the sample and hold circuit for extracting data or commands from the signal stream. A method of operating a primary side wireless transmitter inductively coupled to a secondary side wireless power receiver for supplying power to the wireless power receiver to power a load coupled to the receiver is also disclosed.