Abstract: Described herein are improved configurations for a wireless power transfer. Described are methods and designs to reduce and manage heating and heat dissipation in resonator structures. Configuration and orientation of magnetic material as well as heat sinking material with respect to the dipole moment of the resonator is used to reduce and control thermal properties of the resonator structure and reduce the effects of heating on the performance of wireless power transfer.

Abstract: In one aspect, methods of making a carbon coating are described herein. In some implementations, a method of making a carbon coating comprises applying a first adhesive material to a substrate surface to provide an adhesive surface; rolling a carbon source over the adhesive surface to provide a carbon layer on the adhesive surface; and rolling an adhesive roller over the carbon layer to remove some but not all of the carbon of the carbon layer to provide the carbon coating.

Abstract: A tap changer for connection to a regulating winding of a rated regulation voltage is provided. The tap changer having a linear tap selector having at least one current collector and a linear arrangement of fixed contacts. Tap changer further includes a shielding structure arranged to shield the tap selector from an external electrical field. The shielding structure includes: a first shielding part arranged to be electrically connected to a current collector; and a second shielding part formed at least partly by the fixed contacts. The first and second shielding parts are separated so that the distance between the first and second shielding parts reaches or exceeds the rated regulating voltage insulation distance of the tap changer.

Abstract: A new family of programmable low-noise RF impedance transformers has been developed. These new transformers can be configured and operated to compensate for variable antenna output impedance. This enables better optimization of RF receiving-system SNR. For some applications, these new devices can be more compact and less expensive than any previously available. In particular, such new transformers can improve MRI system performance. This requires additional new art because MRI systems demand components which are not ferromagnetic, which do not produce spurious MR signals and which add very little noise to received RF signals. In various embodiments, these new transformers are comprised of remotely-controlled variable capacitors and inductors which are connected in networks between antenna element outputs and their following LNA inputs. These new step-programmable inductors and capacitors can be either electrically or pneumatically actuated.

Abstract: Provided herein is a variable inductor, comprising a substrate having a surface layer and an inner layer, a plurality of fixed inductors disposed on the substrate, a signal microstrip line serially connecting the fixed inductors to form a serial fixed inductor, a conductive sheet, a signal input terminal, and a signal output terminal, wherein one end of the serial fixed inductor is connected to the signal input terminal, the other end of the serial fixed inductor is connected to the signal output terminal, and the conductive sheet is for controlling the fixed inductors. The variable inductor of this invention is useful in applications where a given number of inductance values are required, so as to efficiently adjust and obtain the required inductance values.

Abstract: A system and method for controlling the frequency of a signal being transmitted wherein the frequency of the signal received at the transmitter site is error corrected before being broadcast. The error in the frequency may be developed and applied to the intermediate frequency upconversion and/or the channel upconversion to reduce or eliminate the effects of the error. In the system and method, a pilot frequency signal can be added to the signal to be broadcast after the signal to be broadcast has been shaped and filtered.

Abstract: A voltage control system has a pair of clockwise and counterclockwise interleaved coils on a portion of a transformer core, the coils having multiple spaced turns providing sets of co-planar alternate electrical contact pairs extending linearly to form a tapping system for varying the output voltage of the transformer. A conductive electrical bridging member is movable in the linear direction of extension of the contacts and bridges a selected pair of contacts, one contact from each coil, to alter the effective number of electrical turns of the two coils between a minimum and maximum output voltage. An adjunctive feature is to provide both a contact lead to the bridging member and appropriate rectification at output ends of the pair of coils in order to produce a direct current output.

Abstract: A variable transformer comprising an annular core with a winding which at the end surface of the core is provided with a circular contact path to be connected with a current brush mounted on a rotor (7). The current brush consists of a contact roller journalled on a shaft pin (11) which from the rotor (7) is directed obliquely downwardly towards the end surface of the core and inwardly towards the axis thereof. The contact roller includes a double-curved contact path (17) for punctiform contact with the contact path (18) of the winding. The reactive pressure provided by said contact urges the contact roller upwardly along the shaft pin (11) which where secured to the rotor (7) is provided with a contact plate (14) that is in heat-conducting communication with the rotor (7). The contact plate (14) includes a plane circular surface (15) against which a correspondingly plane, circular surface (15') of the contact roller about the bore (12) thereof abuts.

Abstract: This variable delay line makes use of a transmission line as a delay line element and is suitable for switching over the delay time of a high speed signal having for instance a rise time of one nanosecond or less. And this variable delay line includes a transmission line which includes an electroconductive path and a ground plate disposed opposingly with a dielectric body interposed therebetween, a fixed contact array consisting of fixed contacts provided at certain intervals along the electroconductive path, and a movable contact which may be slid along contacting the fixed contacts of the fixed contact array. Particularly, the movable contact contacts one of the fixed contacts in the fixed contact array in a first state and contacts two neighboring ones of the fixed contacts in the fixed contact array in a second state, and the movable contact may be slid over the fixed contact array by alternatingly repeating the first and the second states.

Abstract: A variable delay line using a lumped constant type electromagnetic delay line and enjoying a superhigh-speed rising characteristic is disclosed, which comprises an inductance element formed by winding a conductor and possessed of a plurality of taps, a plurality of capacitors having electrodes thereof on one side kept in common connection, a plurality of linking electrodes disposed along the inductance element and adapted to interconnect the taps of the inductance element and the electrodes of the capacitors on the other side, fixed contacts formed of limited surface regions of the linking electrodes, and movable contact means adapted to advance on the fixed contacts while keeping pressed contact with each fixed contact so as to permit selection of the taps of the inductance element.

Abstract: An adjustable voltage transformer having a commutating surface formed of segments of electrical conductors upon which a contact brush is movable while in electrical engagement therewith. Means are provided to "step" the brush between segments, so that when at rest, the brush contacts no more than one segment, thus reducing short-circuiting currents and overheating; however, when the brush is being moved, it is in contact with two segments, thus allowing uninterrupted output from the transformer.

Abstract: A coil for a variable transformer is provided having multiple layers of wire. Winding of such a coil is facilitated by providing an end form having a series of raised fins, or partitions, between which stacked layers of wire are held. The construction provides for easy and economical machine-winding and ensures that the segments of wire forming the commutating surface are held relatively immovable with respect to each other, thus preserving the integrity of the commutating surface.

Abstract: A multi-phase regulating transformer is disclosed having a plurality of windings cooperating with stepping trolleys which are driven by a common driving member. To obtain fine adjustment of the output voltage, the trolleys are coupled to the driving member with different plays to introduce a dead travel of the driving member relative to at least one trolley, which exceeds the spacing between two adjoining individual windings of the transformer.

Abstract: An improved electrical device of the type having a coil and a base and having a thermally conductive electrical insulating material placed between the coil and the base so as to facilitate the flow of heat from the coil to the base, and further having a base with an extended surface area so as to promote the flow of heat from the base to the surrounding air. In one construction, the insulating material is cast in place, thus cementing the coil and the base together.

Abstract: A variable inductor includes a coil, a moveable contactor, and moveable magnetic material caused to move proximate the coil and simultaneously with the contactor. The contactor establishes first and second portions of the coil and, relative to the condition using no magnetic material, the inductance of the first portion is increased while the inductance of the second portion is substantially unchanged. Thus, over substantially all the tuning range, the first portion inductance is maintained greater than the second portion inductance.

Abstract: A variable inductance includes a coil and a moveable contactor which maintains continuous contact with the coil. An electrical connection, which is moveable along with the moveable contactor and away from a first end of the coil, connects the moveable contactor with further contact means positioned remote from the first end of the coil.

Abstract: As part of a moveable carriage assembly, a plurality of trolley wheels are capable of being driven, in worm-gear fashion, along a coil which is rotatable about its axis. One end of the coil is conductive and the other end of the coil is preferably non-conductive. A further part of the traveling carriage assembly electrically interconnects a conductive trolley wheel with an electrical contact situated remote from one end of the coil. Multiple conductive wheels are electrically interconnected.

Abstract: A plurality of moveable contactors may travel along a rotating coil, one end of which is conductive and the other end of which is non-conductive. Two or more electrically interconnected moveable contactors effect a shorting across unused electrical turns and thereby affect unused coil portion resonance. For tuning conditions where very little of the coil is unused, the non-conductive coil portion serves as a sidetrack onto which one or more contactors can move and acts as a mechanical storage or memory for preserving relative positions between contactors.

Abstract: Different line-cord sets connect an electrical device to different supply voltages, assuring that the supply voltage matches the device. Each line-cord set has a uniquely keyed socket and a wall plug. A device receptacle receives the line-cord's keyed socket. An adjustable key on the device mates with the socket's key and rejects nonmating sockets to admit the socket into the receptacle and adjusts the device's input voltage to match the supply voltage.

Abstract: In a variable transformer, two high-conductivity brushes are mounted in a carriage and adapted for longitudinally traversing the transformer winding to contact exposed segments of the winding. By relatively elevating and exposing the odd and even turns along two different traverse paths, contact with the individual odd and even turns is obtained by the dual brush system without short-circuiting adjoining turns, the brushes being interconnected through an external current-limiting or compensating circuit. Spacings between exposed segments of the winding along these respective traverse paths are filled with dielectric material and are wider than the high-conductivity brushes; thus these brushes can never short circuit adjacent turns. The brushes are positioned so that at all times at least one of them contacts an exposed winding segment.