A metamaterial electromagnetic absorber includes a substrate having a first surface on which electromagnetic waves are incident and a second surface opposite the first surface. The substrate is made of a metamaterial. The metamaterial electromagnetic absorber also includes a first inductive conduction pattern and a second inductive conduction pattern formed on the first surface and the second surface, respectively.

An electronic component includes a common port, a first signal port that selectively passes a first signal of a frequency within a first passband, a second signal port that selectively passes a second signal of a frequency within a second passband higher than the first passband, a first resonator provided between the common port and the first signal port in a circuit configuration, a second resonator provided between the common port and the second signal port in the circuit configuration, a stack, and a shield that covers a part of a surface of the stack. The shield includes a specific portion opposed to both the first and second resonators. A distance between the second resonator and the specific portion is greater than a distance between the first resonator and the specific portion.

A semiconductor package includes a transformer having a primary winding and a secondary winding. The primary winding has first and second terminals and a pair of taps. The secondary winding has first and second terminals and a pair of taps. The semiconductor package includes first and second data transfer circuits, a bridge, and a rectifier. The first data transfer circuit is coupled to the pair of taps of the primary winding. The second data transfer circuit is coupled to the pair of taps of the secondary winding. The bridge is coupled to the first and second terminals of the primary winding. The rectifier is coupled to the first and second terminals of the secondary winding.

An isolation transformer includes: a Faraday cage and an input ground terminal for connecting to the Faraday cage; and an output ground terminal connected to the Faraday cage for further connection to a further circuit. The isolation trans-former further has a clean ground input terminal for receiving an external clean ground; a clean ground output terminal for connecting to a further clean ground input terminal of the further circuit; and a physical electrical node placed at a location within the Faraday cage where the magnetic flux and electric field are the lowest. The clean ground input terminal is electrically fed into the isolation transformer and connected to the physical electrical node through a first electric connection, and the physical electrical node is further electrically connected to a clean ground output terminal through a second electric connection. The invention provides for a low-EMI isolation transformer.

A stacked electronic module includes a magnetic device comprising a magnetic body with electrodes of the magnetic device being disposed on a top and bottom surface of the magnetic body, wherein a molding body encapsulates the magnetic body, wherein conductive layers are disposed on a top and bottom surface of the molding body for electrically connected to the electrodes of the magnetic device.

A recess is formed on a bottom surface of a body of an inductor, wherein an electrode for connecting to a ground is disposed in the recess, and an electrode connecting with a coil of the inductor is disposed on a protruding portion adjacent to the recess.

A coil component includes a body having a bottom surface and a top surface opposing each other in one direction, and a plurality of walls each connecting the bottom surface to the top surface of the body; a coil portion buried in the body, and having first and second lead-out portions; first and second external electrodes disposed on the bottom surface of the body and spaced apart from each other; via electrodes penetrating through the body and connecting the first and second lead-out portions and the first and second external electrodes to each other; a third external electrode including a pad portion disposed on the bottom surface of the body, and a connection portion extending to portions of the plurality of walls of the body, and spaced apart from the first and second external electrodes; a shielding layer including a cap portion disposed on the other surface of the body, and side wall portions respectively disposed on the plurality of walls of the body, and connected to the third external electrode; and an insulating layer disposed between the shielding layer and the body, and between the first to third external electrodes and the body.

A shielding layer that is made of a conductive and magnetic material is used to encapsulate the bare metal wire of a coil of an inductor so as to shield the coil from external magnetic field and make the resistance and the power loss of the inductor lower.

The invention enables efficient wireless power transfer, and charging of devices and batteries, in a manner that allows freedom of placement of devices or batteries in one or multiple dimensions. Provided is a base unit for wireless power transfer or charging through a time varying magnetic field. The unit typically includes a magnetic material or layer that guides magnetic flux generated by a charger coil as to create a preferential path for returning magnetic flux from a receiver coil in one or multiple dimensions. The receiver may include a magnetic core having a magnetic permeability exceeding 1 with copper Litz wire around a ferrite core. With power receivers proximate to the base unit, the base unit coil may inductively generate a current in receiver coils or receivers associated with the power receivers. Uni-directionally or bi-directionally wireless communication protocols include NFC, Bluetooth, WiFi, and etc. control and optimize power transfer therebetween.

An electric compressor includes a compression part, an electric motor, an inverter device, and a housing. The inverter device includes an inverter circuit, a noise reduction unit, and a circuit board. The noise reduction unit includes a common mode choke coil and a smoothing capacitor. The common mode choke coil includes an annular core, a pair of winding wires, and an annular electrical conductor. The electrical conductor is split into a first metal plate and a second metal plate in a circumferential direction. The first metal plate is thermally coupled to the housing. The second metal plate is electrically connected to the first metal plate. An electrical resistance value of the first metal plate is larger than that of the second metal plate.