15results about "Mechanically variable capacitors" patented technology

A capacitor provides a plurality of selectable capacitance values, by selective connection of six capacitor sections of a capacitive element each having a capacitance value. The capacitor sections are provided in a plurality of wound cylindrical capacitive elements. Two vertically stacked wound cylindrical capacitance elements may each provide three capacitor sections. There may be six separately wound cylindrical capacitive elements each providing a capacitor section. The capacitor sections have a common element terminal.

An illustrative electrostatic machine includes a shaft that is configured to rotate about an axis, a rotor electrode, and a stator electrode. The rotor electrode and the stator electrode are separated by a gap and form a capacitor. The rotor electrode is fixed to the shaft. The electrostatic machine can also include a housing that is configured to enclose the rotor electrode, the stator electrode, and at least a portion of the shaft. The stator electrode is fixed to the housing. A dielectric fluid fills a void defined by the housing, the rotor electrode, and the stator electrode.

The embodiment of the invention provides a capacitor, a capacitor design method and device, electronic equipment and a medium, and the capacitor comprises a first electrode which comprises a plurality of first metal strips arranged in parallel in a first direction and a plurality of second metal strips arranged in parallel in a second direction, and the second metal strips are vertically connected with one of the first metal strips; the second electrode comprises a plurality of third metal strips which are arranged in parallel in the first direction and a plurality of fourth metal strips which are arranged in parallel in the second direction; the third metal strips and the first metal strips are arranged in a staggered mode, the fourth metal strips are perpendicularly connected with one third metal strip, and the fourth metal strips and the second metal strips are arranged in a staggered mode. The size parameters of the first metal strip and the third metal strip are determined according to the target capacitance value. In the embodiment of the invention, if the capacitance value of the capacitor is not matched with the expected requirement, the capacitance value can be adjusted only by adjusting the size parameters of the third metal strip and the first metal strip, so that the design efficiency of the capacitor is improved.

The present disclosure describes a strained dielectric material comprising at least one type of component containing a domain wall variant pattern, or superdomain structure, that is in phase-co-existence with, or in close phase proximity to, a paraelectric state achieved at zero electric field or over a finite range of non-zero electric field, wherein the at least one type of component comprises one or more of an in-plane sub-domain polarization component, a plane-normal sub-domain polarization component, or a solid solution of a ferroelectric.

The application relates to the technical field of antenna matching and tuning devices, in particular to a medium wave antenna matching assembly based on double helix inductors, which comprises a shell, a coil set arranged in the shell, a movable magnetic core rod, a lead screw, a variable capacitor, a mounting plate, a coarse tuning knob, a fine tuning knob, an antenna interface and a speed reducer; wherein an operation table is arranged on the shell, the coarse tuning knob and the fine tuning knob are arranged on the operation table; the coil set comprises a first double helix inductor, the magnetic core rod is arranged along the axial direction of the first double helix inductor and can axially move relative to the first double helix inductor; the lead screw is arranged in the shell and is in transmission connection with the magnetic core rod, the coarse tuning knob is in transmission connection with the lead screw so as to drive the magnetic core rod to perform coarse tuning; the variable capacitor is arranged on the mounting plate, the fine tuning knob is in transmission connection with the variable capacitor through the speed reducer so as to perform fine tuning on the variable capacitor; and the antenna interface is arranged on the shell and is electrically connected with the first double helix inductor and the variable capacitor to form an antenna matching network.

Provided herein are highly porous electrode structures made from natural materials and retaining natural architecture, which are highly permeable and find use in capacitive deionization desalination systems and methods. The porous electrode includes an electrode body including an architecturally intact carbonized organic material having a hydraulic permeability of at least 0.5×10−13 m2 as determined by application of Darcy's Law, and optionally having hierarchical porosity and a non-metal conductor attached to the electrode body. Also provided herein are methods of making the porous electrodes, desalination systems including the porous electrodes, and methods of desalinating water using the desalination systems including the porous electrodes.

The invention relates to a wireless system (100) having a first assembly (20) comprising a power consumption coil (21) and at least one capacitor (10), which form a power consumption resonant circuit, and having a second assembly (30) for receiving an electrical alternating current and generating an electrical direct current and / or for receiving an electrical direct current and generating an electrical alternating current, wherein the capacitor (10) is in the form of a multilayer capacitor with a capacitor body (11) having first electrode layers (1) and second electrode layers (2) which alternate along a stacking direction of the capacitor (10) with dielectric layers (3) inserted therebetween, each of the first electrode layers (1) having at least one first internal electrode (1a), and each of the second electrode layers (2) having at least one second internal electrode (2a). The capacitor (10) further comprises a first coil connection (12a), a second coil connection (12b), a first capacitor connection (13a), and a second capacitor connection (13b), the first internal electrodes (1a) being connected to the first coil connection (12a), and the second internal electrodes (2a) being connected to the second coil connection (12b). The second assembly (30) is electrically conductively connected to the capacitor (10) via the first capacitor connection (13a) and the second capacitor connection (13b), and one of the first electrode layers (1), one of the second electrode layers (2), or a dielectric bottom layer (4) is formed by a support (5) on which the capacitor (10) is mounted.

An electro-hydraulic actuator includes a deformable shell defining an enclosed internal cavity and containing a liquid dielectric, first and second electrodes on first and second sides, respectively, of the enclosed internal cavity. An electrostatic force between the first and second electrodes upon application of a voltage to one of the electrodes draws the electrodes towards each other to displace the liquid dielectric within the enclosed internal cavity. The shell includes active and inactive areas such that the electrostatic forces between the first and second electrodes displaces the liquid dielectric within the enclosed internal cavity from the active area of the shell to the inactive area of the shell. The first and second electrodes, the deformable shell, and the liquid dielectric cooperate to form a self-healing capacitor, and the liquid dielectric is configured for automatically filling breaches in the liquid dielectric resulting from dielectric breakdown.

With this invention, electronic circuit components such as transistors, diodes, zener diodes and varicap diodes, which are conventionally manufactured with semiconductors, can be produced without semiconductors by means of a much simpler and cheaper technology, and by the same technology a compensation capacitor can be manufactured whose capacitance is automatically varied so as to follow changes in the load simultaneously. This principle may also be applied in other areas such as microwaves. In simple terms, the electric and magnetic fields of the main capacitor are blocked by a control voltage and varied between zero and maximum values, and as a result the capacitance of the main capacitor is changed. The fundamental principle here is the control of the electric and magnetic fields between the two conductive plates of a fixed-capacitance capacitor. For this purpose, a control voltage is applied between a third metallic plate, designed as a grid or similar structure so as not to block the electric and magnetic fields of the main capacitor and placed closer to one of the two plates, and the adjacent metallic plate, while a DC voltage (VDD) of suitable value for the circuit is applied across the terminals of the main capacitor. In a slightly different version, two grids are provided so that the structure can be used both as a diode and as a transistor. In both cases, the capacitance value of the main capacitor varies depending on the control voltage, i.e. Co = f(Vi). This means that, similar to classical transistors, the impedance of the circuit varies depending on the control voltage. In this structure, which exhibits behaviour similar to FET transistors, the output voltage is taken across the two outer plates of the capacitor with a design similar to a classical transistor circuit. In the production stage, the dielectric will be formed by coating very thin special plastic or other suitable materials with an appropriate metal of suitable thickness for the design and winding it in roll form. Likewise, dielectric layers may also be formed as very thin oxide or other non-conductive chemical compounds on the surfaces of the metallic 24 plates. That is, use will be made of conventional capacitor technologies such as ceramic, tantalum and electrolytic capacitors. In addition, different methods may be developed depending on the field of application. These designs will find application areas as semiconductor-free transistors, diodes, voltage-controlled variable capacitors, and many other uses, some of which have been explained in this project.

Ultrasonic Probe This description relates to an ultrasonic probe (200) comprising: - an interconnecting substrate (230); - an array of ultrasonic transducers (201); - a control integrated circuit (202) electrically connected to the array of ultrasonic transducers and positioned on a first face (230A) of the interconnecting substrate; - a capacitive structure (210) positioned on a second face (230B) of the interconnecting substrate opposite the first face, the capacitive structure comprising a mechanically rigid insulating substrate, including at least one dielectric layer, and two metallic elements insulated from each other and positioned on either side of each dielectric layer, forming at least one capacitor. Figure for the abbreviation: Fig. 2A

Disclosed herein are devices comprising stretchable interdigitated electrode arrays and methods for fabricating the devices. The devices are capable of acting as elongation sensors by sensing a change in the capacitance of the device as the distance between the interdigitated fingers changes when the device is elongated or compressed. The device may be coupled to other devices such as to be able to sense elongation or compression of the coupled device. The interdigitated fingers of the device are supported by a substrate and may be fabricated using traditional microfabrication techniques.

Provided are a flexible variable capacitor and method for preparation thereof. The flexible variable capacitor includes two highly conductive flexible electrode layers and an elastomer dielectric insulation layer disposed between the two highly conductive flexible electrode layers, wherein the highly conductive flexible electrode layers include first polymeric elastomer and carbon nanomaterial, and the elastomer dielectric insulation layer includes second polymeric elastomer and functional ceramic nanoparticles. The method for preparation of the flexible variable capacitor is as follows: first, preparing an elastomer composite film with different functions, and then pressing upper and lower electrode layers with the intermediate elastomer insulation layer together to obtain a stretchable strip-shaped plate capacitor. Different from existing technologies, the present application uses independently developed highly conductive flexible electrodes to replace traditional silver oil electrodes, which greatly reduces the cost of variable capacitor devices, and enhances the integration and operability. The prepared flexible variable capacitor has characteristics such as high dielectric constant, low dielectric loss, simple preparation process, and capacitance being sensitive to deformation.

A micromachined ultrasonic transducer (MUT) (400). The MUT (400) includes: a substrate (402); a membrane (406) suspending from the substrate (402); a bottom electrode (408) disposed on the membrane (406); a piezoelectric layer (410) disposed on the bottom electrode (408) and an asymmetric top electrode (412, 722) is disposed on the piezoelectric layer (410). The areal density distribution of the asymmetric electrode (722) along an axis (742) has a plurality of local maxima (702), wherein locations of the plurality of local maxima (735, 737) coincide with locations (726, 728) where a plurality of anti-nodal points (516, 517) at a vibrational resonance frequency is located.