The invention relates to a coil in the form of a transmitting and/or receiving coil of a device for wireless signal transmission by means of electromagnetic waves, wherein the coil has an impedance matching circuit for adapting the connection impedance of the coil to an input impedance of a signal transmitting and/or receiving device of the device for wireless signal transmission to be connected to the coil, wherein the impedance matching circuit is formed entirety or at least partially by at least partially overlapping conductor tracks of the coil. The invention also relates to a device for wireless signal transmission by means of electromagnetic waves, comprising a signal transmitting and/or receiving device and a coil connected to the signal transmitting and/or receiving device. The invention further relates to a method for producing such a coil.)

A contactless power transmission apparatus includes a receiver that includes a resonant circuit including a receiver coil that receives electric power from a transmitter coil included in a transmitter and a resonant capacitor connected in parallel to the receiver coil. The receiver outputs, through an output coil having fewer turns than the receiver coil and a coil connected to the output coil, electric power received by the resonant circuit and rectifies the output power with a rectifier circuit. The transmitter includes a control circuit that controls a voltage and a switching frequency of alternating current power to be supplied to the transmitter coil from a power supply circuit to allow the contactless power transmission apparatus to continuously perform a constant voltage output operation.

A transformer system is provided that includes four magnetically coupled coils having fixed spacing geometry. The four magnetically coupled coils include a drive coil that produces magnetic fields and a load coil. All coils are coupled in the transformer system, but the first resonant coil is highly coupled with the drive coil so that the resonant coil can receive energy from the drive coil and the second resonant coil is highly coupled to the load coil so that the load coil can extract energy efficiently from the second resonant coil.

A system and method for wirelessly transmitting power through a window comprising transmitting and receiving coils or electrodes, which are embedded in or otherwise mounted with respect to flexible polymer suction cups. The transmitting and receiving coils or electrodes are arranged opposite one another on the interior and exterior of the window, respectively, via attachment of the suction cups thereon. Power provided to the transmitting coil or electrode, for example from an auxiliary power adapter of a vehicle, may be transmitted through the window by inductive coupling or capacitive coupling. The power provided to the receiving coil or electrode can then be used to power external devices such as taxi roof signs, lighted advertising signs, spotlights and other auxiliary off-road lights, trailer tail lights, emergency and warning lights, speakers, cameras, battery chargers, and packages of scientific instruments for measuring air pollutants and various environmental factors such as weather parameters.

A transformer system is provided that includes four magnetically coupled coils having fixed spacing geometry. The four magnetically coupled coils include a drive coil that produces magnetic fields and a load coil. A first resonant coil is magnetically coupled to the drive coil producing energy that is stored by the first resonant coil. A second resonant coil is magnetically coupled to the first resonant coil to propagate the energy stored in the first resonant coil to the second resonant coil without using a magnetic core. The second resonant coil is then magnetically coupled to the load coil where the energy is transferred to the load coil.

A capacitive coupling enhanced (CCE) transponder chip module (TCM) comprises an RFID chip (CM, IC), optionally contact pads (CP), a module antenna (MA), and a coupling frame (CF), all on a common substrate or module tape (MT). The coupling frame (CF, 320A) may be in the form of a ring, having an inner edge (IE), an outer edge IE, 324) and a central opening (OP), disposed closely adjacent to and surrounding the module antenna (MA). A slit (S) may extend from the inner edge (IE) to the outer edge (OE) of the coupling frame (CF) so that the coupling frame (CF) is open loop. An RFID device may comprise a transponder chip module (TCM) having a module antenna (MA), a device substrate (DS), and an antenna structure (AS) disposed on the device substrate (DS) and connected with the module antenna (MA). A portion of a conductive layer (CL, 904) remaining after etching a module antenna (MA) may be segmented to have several smaller isolated conductive structures.

A wireless power transfer apparatus for capacitive-inductive power transfer has a primary and a secondary device separated by the conductive member. The primary device has at least two transmitter plates configured to be capacitively coupled with the conductive member to induce a current flow and generate a magnetic field in the conductive member. The secondary device is connectable to a load and provided with a receiving coil configured to be inductively coupled with the conductive member.

Embodiments discussed herein refer to connectors that enable two structures or devices to be coupled together in a manner that enables consistent and reliable operation of contactless communications and power transfer. The connector integrates power and alignment such that when two connectors are coupled together the power connections are also responsible for connector alignment. The connector alignment ensures that contactless communication channels, spanning between the connectors, are aligned to enable consistent and reliable operation of contactless communications.

A contactless power transmission apparatus includes a receiver that includes a resonant circuit including a receiver coil that receives electric power from a transmitter coil included in a transmitter and a resonant capacitor connected in parallel to the receiver coil. The receiver outputs, through an output coil having fewer turns than the receiver coil and a coil connected to the output coil, electric power received by the resonant circuit and rectifies the output power with a rectifier circuit. The transmitter includes a control circuit that controls a voltage and a switching frequency of alternating current power to be supplied to the transmitter coil from a power supply circuit to allow the contactless power transmission apparatus to continuously perform a constant voltage output operation.

A filter device is mounted on a module substrate and is shielded by a shield member. The filter device has first and second side surfaces opposed to each other. A ground terminal and signal terminals are formed on a bottom surface of the filter device. The shield member includes side wall portions facing the first and second side surfaces. The filter device includes plural LC parallel resonance circuits therein. The inductors of the LC parallel resonance circuits are arranged in parallel with the first side surface and the bottom surface. Each inductor extends upward from its end portion electrically connected to the ground terminal, extends from the first side surface toward the second side surface, and then extends toward the bottom surface. The gap between the first side surface and the corresponding side wall portion is smaller than that between the second side surface and the corresponding side wall portion.