A structure for wireless communication having a plurality of conductor layers, an insulator layer separating each of the conductor layers, and at least one connector connecting two of the conductor layers wherein an electrical resistance is reduced when an electrical signal is induced in the resonator at a predetermined frequency. The structure is capable of transmitting or receiving electrical energy and/or data at various near and far field magnetic coupling frequencies.

A system including: a foot switch for controlling a medical device; and a receiver for the medical device to be controlled as components. Where the foot switch and the receiver are configured for wirelessly transmitting uniquely assignable control signals after completion of coupling at least from the foot switch to the receiver; one of the components comprises an NFC read module for reading out a transponder in a vicinity and an other component comprises the transponder that can be read out by the NFC read module; and the NFC read module is configured at least to initiate the coupling of the foot switch and the receiver on the basis of items of information read out from the transponder.

An RFID transponder includes a coding and modulation unit that generates a transmission signal by modulating an oscillator signal with an encoded bit signal. During a first and a second time segment, the encoded bit signal assumes a first and a second logic level, respectively. The transmission signal includes a first signal pulse having a first phase within the first time segment and a second signal pulse having a second phase that is shifted with respect to the first phase by a predefined phase difference within the second time segment. The transmission signal is paused for a pause period between the first and the second signal pulse. The pause period is shorter than a mean value of a period of the first time segment and a period of the second time segment.

Systems, methods and apparatus for wireless charging are disclosed. One method includes providing a first charging current to a first transmitting coil in a wireless charging device, where the first transmitting coil is coupled to a receiving coil in a first power receiving device, providing a second charging current to a second transmitting coil in the wireless charging device, where the second transmitting coil is coupled to a receiving coil in a second power receiving device, the first charging current and the second charging current being provided at different frequencies from one another, receiving a first modulated signal from the first power receiving device, where the first modulated signal includes a carrier signal provided at a frequency corresponding to the frequency of the first charging current, and filtering the first modulated signal using a band-pass filter configured to block a second modulated signal transmitted by the second power receiving device.

A vehicle identification means serve to identify vehicles by means of a unique identification. The protection of such identifications against falsification and tampering proves particularly problematic. For this purpose, known vehicle identification means have data carriers which can be read out in a contactless fashion and on which data for permitting unambiguous identification are stored. However, such identification means are very complex in design and are susceptible to faults. The invention provides an improved vehicle identification means which has a design which is as simple as possible and has a lower level of susceptibility to faults. This is ensured in that at least one NFC transponder which can be read out in a contactless fashion and has the purpose of near-field communication with a data carrier and an antenna is assigned to a registration number plate body, wherein at least part of the antenna is arranged in a breakthrough.

A Near Field Communication (NFC) reader can wirelessly cooperate with a rectangular prism-shaped transponder having an NFC transponder antenna. The NFC reader includes an NFC controller, a matching network coupled to the NFC controller, and a receptacle capable of at least partially holding the transponder. The receptacle has a bottom wall, a lateral wall and a shape designed such that the transponder cannot be placed in the receptacle in a direction where the NFC transponder antenna is parallel to the bottom wall. The receptacle includes first and second NFC reader antennas located in two non-parallel parts of the lateral wall and a connection coupling the first and second reader antennas to the matching network.