1438 results about "High capacitance" patented technology

A method of making a metal capacitor includes the following steps. A dielectric layer having a metal interconnection and a capacitor electrode is provided. Then, a treatment is performed to increase the dielectric constant of the dielectric layer surrounding the capacitor electrode. The treatment can be UV radiation, a plasma treatment or an ion implantation. Accordingly, the metal capacitor will have a higher capacitance and RC delay between the metal interconnection and the dielectric layer can be prevented.

A process for producing meso-porous nanocomposite electrode comprising nano-scaled graphene platelets. The process comprises: (A) providing nano-scaled graphene platelets, wherein each of the platelets comprises a single graphene sheet or a stack of multiple graphene sheets, and the platelets have an average thickness no greater than 100 nm (preferably less than 5 nm and most preferably less than 2 nm in thickness); (B) combining a binder material, the graphene platelets, and a liquid to form a dispersion; (C) forming the dispersion into a desired shape and removing the liquid to produce a binder-platelet mixture; and (D) treating the binder material under a desired temperature or radiation environment to convert the binder-platelet mixture into a meso-porous nanocomposite electrode, wherein the platelets are bonded by the binder and the electrode has electrolyte-accessible pores characterized in that the nanocomposite has a surface area greater than about 100 m2 / gm (preferably greater than 200 m2 / gm, more preferably greater than 500 100 m2 / gm, and most preferably greater than 1,000 m2 / gm). A supercapacitor featuring such a nanocomposite exhibits an exceptionally high capacitance value.

A MEMS tunable capacitor with angular vertical comb-drive (AVC) actuators is described where high capacitances and a wide continuous tuning range is achieved in a compact space. The comb fingers rotate through a small vertical angle which allows a wider tuning range than in conventional lateral comb drive devices. Fabrication of the device is straightforward, and involves a single deep reactive ion etching step followed by release and out-of-plane assembly of the angular combs.

Composite electrodes comprising carbon nanofibers (fibrils) and an electrochemically active material are provided for use in electrochemical capacitors. The fibril composite electrodes exhibit high conductivity, improved efficiency of active materials, high stability, easy processing, and increase the performance of the capacitor. A method for producing the composite electrodes for use in electrochemical capacitors is also provided.

The tantalum powder for capacitors of the present invention has a specific surface area SB as determined by the BET method of 1.3 m<2> / g or more, and an SB / SF ratio between the specific surface area SB as determined by the BET method and the specific surface area SF determined by the FSS method of 4 to 10. This tantalum powder not only has a large specific surface area SB, but also has suitable cohesive strength and uniform porosity.Consequently, a solid state electrolytic capacitor having high capacitance and low ESR can be obtained by providing with a capacitor anode formed from a sintered body of this tantalum powder. In addition, whether or not this tantalum powder is suitable for the production of a tantalum capacitor having high capacitance and low ESR can be determined easily and reliably by evaluating the tantalum powder using the specific surface area SB as determined by the BET method and the SB / SF ratio between SB and the specific surface area SF determined by the FSS method.

In accordance with this invention the above and other problems are solved by a switching apparatus and method that uses a switching circuit having a pair of parallel solid-state diodes (e.g., PN diodes), one of which is connected to a transistor (e.g., power MOSFET or IGBT), to switch a capacitor in or out of a variable capacitance element of an impedance matching network. Charging a body capacitance of the transistor reverse biases one of the two diodes so as to isolate the transistor from the RF signal enabling a low-cost high capacitance transistor to be used. Multiple such switching circuits and capacitors are connected in parallel to provide variable impedance for the purpose of impedance matching.

A high performance, high capacitance gain, electric connector for data transfer applications. At least eight sequentially positioned elongate contact members are connected in a series of signal pairs. A first signal pair includes a fourth contact member and a fifth contact member. A second signal pair includes a third contact member and a sixth contact member. In addition, a third signal pair comprises a first contact member and a second contact member. Finally, a seventh and an eighth contact member are in a fourth signal pair. One member of each contact member pair is configured differently from the other member of the pair, the respective contact members being oriented relative to one another such that they substantially remain in generally parallel planes, but define non-parallel paths. Each of the third and fifth contact members mounts a plate-like extension oriented in a first direction and in respective planes generally parallel to one another. Each pair of extensions are separated by a first dielectric such that a first capacitor is formed. Furthermore, each of the fourth and sixth contact members mounts a plate-like extension oriented in a second direction and also in respective planes generally parallel to one another. Each pair of extensions are likewise separated by a second dielectric such that a second capacitor is formed. Each contact of each contact member pair has a plug engaging portion and a board engaging portion, the plurality of contact members having a selected shape, being arranged relative to one another, and being housed collectively by a dielectric casing so as to minimize crosstalk during data transfer.