109 results about "Ferrite bead" patented technology

A dipole antenna may be created by surrounding a portion of the continuous conductor with a nonconductive magnetic bead, and then applying a power source to the continuous conductor across the nonconductive magnetic bead. The nonconductive magnetic bead creates a driving discontinuity without requiring a break or gap in the conductor. The power source may be connected or applied to the continuous conductor using a variety of preferably shielded configurations, including a coaxial or twin-axial inset or offset feed, a triaxial inset feed, or a diaxial offset feed. A second nonconductive magnetic bead may be positioned to surround a second portion of the continuous conductor to effectively create two nearly equal length dipole antenna sections on either side of the first nonconductive magnetic bead. The nonconductive magnetic beads may be comprised of various nonconductive magnetic materials, and preformed for installation around the conductor, or injected around the conductor in subsurface applications. Electromagnetic heating of hydrocarbon ores may be accomplished.

A noise filter has an element body, first to fourth terminal electrodes, and a connection conductor. The first to fourth terminal electrodes are disposed on the exterior of the element body. The connection conductor is also disposed on the exterior of the element body. A capacitor is formed in the element body and is electrically connected between the first and second terminal electrodes and the third and fourth terminal electrodes. The first and second terminal electrodes are electrically connected through the connection conductor. The connection conductor is covered by a resin containing ferrite. Since the connection conductor is covered by the resin containing ferrite, the connection conductor and the ferrite-containing resin function as a ferrite bead inductor.

A dipole antenna may be created by surrounding a portion of the continuous conductor with a nonconductive magnetic bead, and then applying a power source to the continuous conductor across the nonconductive magnetic bead. The nonconductive magnetic bead creates a driving discontinuity without requiring a break or gap in the conductor. The power source may be connected or applied to the continuous conductor using a variety of preferably shielded configurations, including a coaxial or twin-axial inset or offset feed, a triaxial inset feed, or a diaxial offset feed. A second nonconductive magnetic bead may be positioned to surround a second portion of the continuous conductor to effectively create two nearly equal length dipole antenna sections on either side of the first nonconductive magnetic bead. The nonconductive magnetic beads may be comprised of various nonconductive magnetic materials, and preformed for installation around the conductor, or injected around the conductor in subsurface applications. Electromagnetic heating of hydrocarbon ores may be accomplished.

An end-fed sleeve dipole is provided herein with improved impedance match and increased bandwidth by incorporating a ¾-wavelength transformer in the antenna design. The ¾-wavelength transformer is compatible with a number of different choking schemes, including but not limited to, a single ¼-wave choke sleeve, a single ¼-wave choke sleeve with additional ferrite beads, and two or more ¼-wave choke sleeves with or without ferrite beads. In some embodiments, one or more shunt resonators may be used to provide additional impedance compensation.

A communication device having a wireless communication system and a Near Field Communication (NFC) circuit is provided. The NFC circuit includes two pads, two ferrite beads and a NFC controller. The first pad and the second pad are coupled to a NFC antenna. The first and the second ferrite bead are respectively coupled to the first pad and the second pad. The NFC controller includes two pins. The first pin and the second pin are coupled to the first ferrite bead and the second ferrite bead, respectively. The first pin and the second pin output a differential NFC signal to be emitted by the NFC antenna. The first and the second ferrite bead allow the fundamental frequency component of the NFC signal to pass, and filter out a plurality of high-frequency components for avoiding the operating frequency of the wireless communication system from being interfered by the high-frequency components.

A headphone receiver apparatus for use with low power transmitters includes a pair of headphone speaker enclosures connected by a headband. An antenna element in the form of a spring steel band or a plastic cable / antenna band where one of the conductors is utilized as the antenna is configured generally concentric with but offset from the headband and the user's head by at least 0.5 inches over at least some length of the antenna. Low-noise performance is improved by a low noise amplifier incorporated before the receiver IC, and a bandpass filter interposed between the low noise amplifier and the receiver IC. A base-loading inductor is used to tune the antenna element to resonance, with or without capacative end-loading. Lumped inductors, ferrite beads, or a parallel resonant LC circuit may be used to isolate the shield conductor at RF frequencies, and / or to reduce the loading of the other conductors.

A method for selecting a ferrite bead for a filter to avoid a peak value in a frequency response curve of the filter is provided. The method includes the steps of: building an equivalent model database including parameters of equivalent models of ferrite beads, the parameters including an inductance and a capacitance of a corresponding equivalent model of each ferrite bead; calculating parameters of a desired ferrite bead in the filter based on parameters of the filter, the parameters of the ferrite bead including an inductance, a capacitance, and a resonant frequency; adjusting parameters of the filter until the calculated resonant frequency equals or approaches a desired resonant frequency, and finding an inductance and a capacitance respectively equaling or approaching the calculated inductance and the calculated capacitance in the database; and selecting a ferrite bead with the appropriate inductance and capacitance as found in the database for the filter.

A device designed to protect low-voltage circuits includes a transmission line for transmitting electromagnetic signals of an operational frequency band, a capacitor located in series on the transmission line, and a diode-based clamping component connecting the transmission line to ground. In use, the capacitor is designed to filter any unwanted transient energy that falls beneath the operational frequency band and the clamping component is designed to limit unwanted transient energy that falls within the operational frequency band. A gas discharge tube (GDT) connecting the transmission line to ground preferably protects low-voltage circuits from higher current threats. An inductive component constructed of a ferrite material, such as a ferrite bead, is connected in series with the GDT. Upon activation of the GDT, the inductive component manages the fall time of the GDT and thereby prevents the output waveform generated in response to GDT activation from shifting into the operational frequency band.

The invention relates to a power supplying circuit and a power supplying method for chain-type SVG (static var generator) modules. The power supplying circuit comprises a constant alternating-current control power supply and a plurality of current sensing receiving circuits, and each current sensing receiving circuit consists of a ferrite bead and a coil. An output terminal of the constant alternating-current control power supply is connected with a high-voltage cable, and the high-voltage cable is penetratingly arranged in the ferrite beads of the current sensing receiving circuits to connect the ferrite beads in series structure. Each input terminal of the SVG modules is respectively connected with each output terminal of the current sensing receiving circuits, and the ferrite beads are located outside the SVG modules. The constant alternating-current control power supply comprises a semi-controlled rectifier bridge, an inductor, a direct-current capacitor and a phase-shifting and voltage-regulating inverter bridge. Alternating-current utility power is rectified to direct-current voltage containing ripple components through the semi-controlled rectifier bridge, and current surge is reduced via the inductor, the ripple components in the direct-current voltage are restrained by the direct-current capacitor parallelly connected between two output terminals of the semi-controlled rectifier bridge, and then the alternating-current utility power is inputted into the phase-shifting and voltage-regulating inverter bridge. The power supplying circuit and the power supplying method for the chain-type SVG (static var generator) modules can be widely applied to the field of high-voltage reactive power compensation.