Systems and methods for magnetic shielding are described. A magnetic shield formed of a material having a high magnetic permeability may be degaussed using a toroidal degaussing coil. The toroidal degaussing coil may enclose at least a portion of the shield. Magnetic field gradients may be actively compensated using multiple magnetic field sensors and local compensation coils. Trapped fluxons may be removed by an application of Lorentz force wherein an electrical current is passed through a superconducting plane.

A passenger vehicle, comprising: a frame of a vehicle; a passenger compartment of the vehicle, including a selected region suitable for presence of people; a magnetic field source configured such that upon electrification, magnetic field radiation is caused in the selected region; a plurality of magnetic field sensors arranged along generally intersecting planes for providing magnetic field sensing data along at least two axes within the selected region; and at least one circuit mounted in the vehicle and electrically connected to the plurality of magnetic field sensors, the at least one circuit being configured to measure the magnetic field radiation in the selected region.

The present invention relates to an electromagnetically-countered display system including at least one wave source and at least one counter unit, where such a wave source irradiates harmful electromagnetic waves and the counter unit emits counter electromagnetic waves for countering the harmful waves therewith. More particularly, the present invention relates to various counter units for the electromagnetically-countered display system and to various mechanisms to counter the harmful waves with the counter units, e.g., by matching configurations of the counter units with those of the wave sources, by matching wavefronts of the harmful waves with those the counter waves, and so on. The present invention also relates to various methods of countering the harmful waves with such counter waves by source and/or wave matchings, various methods of providing the counter units for emitting the counter waves defining desired wave characteristics, and the like. The present invention further relates to various processes for providing the electromagnetically-countered display systems and their counter units. The present invention further relates to various electric and magnetic shields employed either alone or in conjunction with the counter units for minimizing irradiation of the harmful waves from the shaving system.

Transparent structures containing a transparent electrically conductive fluid are used for aesthetically appealing designs and/or improved fatigue performance. Some structures have multiple isolated conductors while others have a single conductive area that may be used as a transparent antenna or a transparent EMI shield. Other embodiments employ fluids that change crystalline structure under an applied voltage such that a structure can change color and/or display a message.

Various circuit board systems and methods of use and manufacture thereof are disclosed. A circuit board system can have a first circuit board including a substrate and a first component susceptible to electromagnetic interference carried by the substrate. The system can also include a second circuit board including a second substrate, and a shield engaged to the substrate of the first component, the shield at least partially covering the first component and being configured to protect the first component from electromagnetic interference, wherein the shield couples the substrate of the first circuit board to the substrate of the second circuit board.

System, method, and computer readable medium are disclosed for reducing a time-varying undesired magnetic field in a passenger compartment of a vehicle. Reducing a time-varying undesired magnetic field in a passenger compartment of a vehicle includes a magnetic field source for transmitting time-varying currents resulting in the time-varying undesired magnetic field in the passenger compartment including a selected region suitable for presence of people; a sensor for detecting the time-varying undesired magnetic field and to provide sensing data; a magnetic field generator for generating a time-varying cancellation magnetic field in the selected region; a circuit for receiving the associated sensing data; determining the time-varying cancellation magnetic field from the associated sensing data; and transmitting signals to the magnetic field generator to thereby generate the time-varying cancellation magnetic field for at least reducing the time-varying undesired magnetic field.

The present disclosure provides a protective enclosure for electronic systems. The enclosure comprises a polymer-containing matrix and a metamaterial incorporated into the matrix. The metamaterial is tuned to a specific permittivity or permeability to absorb or reflect a particular frequency. The protective enclosure may be used to create a safe inner environment for electronic components while facilitating uninterrupted wireless communications to/from the outer environment. Additionally, the protective enclosure may be used to protect against electromagnetic interference. In particular, shielding metamaterials are configured individually or in combination to specifically shield (via reflection, absorption, etc.) against relatively wide bands of electromagnetic frequencies, while transparent metamaterials are configured specifically to pass electromagnetic signals within narrow bands of frequencies. This new approach resolves and vastly improves current shield solutions, such as Faraday cages. For example, tuned metamaterials may be configured across a variety of preconfigured frequencies, and can be constructed of lightweight materials.

A method, a system, and a storage medium for detecting noise of a fluxgate sensor are disclosed. Acquiring sensitivity of the fluxgate sensor; acquiring open-loop sensitivity of the probe of the fluxgate sensor; placing the probe in a magnetic shielding module to obtain the total noise of the fluxgate sensor; setting a probe replacing circuit to replace the probe, and placing it in a magnetic shielding module to obtain external noise introduced by parts outside the probe; acquiring the open-loop noise of the probe based on the total noise of the fluxgate sensor and the external noise; calculating the closed-loop noise of the probe by multiplying the open-loop noise by the ratio of the sensitivity of the fluxgate sensor to the open-loop sensitivity of the probe; and acquiring the actual noise of the fluxgate sensor based on the closed-loop noise of the probe and the external noise.

A vehicle, comprising: a frame; a passenger compartment including a selected region suitable for presence of people; an electric motor that, when in operation is associated with an undesired magnetic field emitted into the selected region; a magnetic field generator positioned in at least one of a passenger seat, a vehicle door, or the frame, wherein the magnetic field generator is configured to at least reduce the undesired magnetic field in the selected region; a magnetic field sensor configured for sensing the undesired magnetic field emitted into the selected region; and a circuit configured to: receive from the magnetic field sensor sensing data indicative of the undesired magnetic field; determine a cancelation magnetic field for at least reducing the undesired magnetic field; and direct electrical signals to the magnetic field generator for generating the cancelation magnetic field for at least reducing the undesired magnetic field.

Various circuit board systems and methods of use and manufacture thereof are disclosed. A circuit board system can have a first circuit board including a substrate and a first component susceptible to electromagnetic interference carried by the substrate. The system can also include a second circuit board including a second substrate, and a shield engaged to the substrate of the first component, the shield at least partially covering the first component and being configured to protect the first component from electromagnetic interference, wherein the shield couples the substrate of the first circuit board to the substrate of the second circuit board.