Abstract: The present invention relates to A radio frequency (RF) switch and an apparatus including the RF switch. In an aspect of the present invention, an RF switch includes a transmission line having one end connected to an input terminal or an output terminal and the other end connected to a signal line and configured to transfer an RF signal, and a diode disposed between the input terminal and the transmission line or between the output terminal and the transmission line, the diode being configured to control whether or not to transmit the RF signal. In another aspect, an RF switch includes a transmission line having one end connected to an input terminal and the other end connected to an output terminal, and a diode disposed between the input terminal and the transmission line or between the output terminal and the transmission line, the diode being configured to control whether or not to transmit the RF signal. Here, a CRLH (Composite Right/Left-Handed) transmission line is employed as the transmission line.

Abstract: Disclosed is an anode supported flat-tube solid oxide fuel cell including: a stack including a plurality of unit cells layered therein, each of the unit cells having an anode support, wherein within the anode support, a flow path allowing a fuel gas to flow is formed, and on a surface of the anode support, an electrolyte, a cathode, and an interconnect layer are provided, wherein the interconnect layer positioned between the unit cells constituting the stack is formed by a paste obtained by mixing an electrical conductive material with glass, and on the interconnect layer formed by the paste, a metallic mesh for drawing out a current collection wire is disposed.

Abstract: The present invention provides an RF switch, including a diode adapted to operate as a switch when a control current is applied thereto, a first CRLH transmission line of a ? degree phase, which provides one signal transfer path from a terminal 1 to a terminal 2 when the diode is shorted due to application of a control current, and a second CRLH transmission line of a ?-180 degree phase, which has a 180 degree phase difference from that of the first CRLH transmission line and provides the other signal transfer path from the terminal 1 to the terminal 2. The present invention provides an RF switch having a broad-band characteristic by employing a CRLH transmission line. More specifically, the present invention provides a ring-shaped RF switch, which has a broad-band characteristic and can also be miniaturized at a low frequency band, by employing a CRLH transmission line having a 180 degree phase difference in a broad band.

Abstract: Disclosed is a method for heating a metallic interconnect for a solid oxide fuel cell (SOFC) to 150˜300° C., which can minimize the thermal shock by reducing a temperature difference between the metallic interconnect and a coating material during a thermal plasma coating process on the metallic interconnect for the SOFC. Accordingly, through the disclosed method, a densified coating layer with minimized micro pores/cracks can be formed on the surface of the metallic interconnect. Thus, it is possible to reduce the loss in output performance during the operation of the SOFC at a high temperature, and to maintain the long-term durability and performance of the metallic interconnect.

Abstract: Disclosed is a method for coating a metallic interconnect for a solid oxide fuel cell (SOFC), the method including the steps of: carrying out pre-treatment for removing impurities adhered on a surface of the metallic interconnect; and carrying out pulse plating with cobalt as an anode, and the metallic interconnect as a cathode, in which an average current density (Ia) is set in a room-temperature cobalt plating solution, and a maximum current density (Ip), a current-on time (Ton) and a current-off time (Toff) are adjusted based on Ia=Ip×Ton/(Ton+Toff). Through the disclosed method, it is possible to obtain a metallic interconnect having a coating surface which has a high electrical conductivity and a high chrome volatilization inhibiting property and can minimize the occurrence of micro-cracks and micro-pores, thereby improving the performance of the SOFC.

Abstract: The present invention relates to A radio frequency (RF) switch and an apparatus including the RF switch. In an aspect of the present invention, an RF switch includes a transmission line having one end connected to an input terminal or an output terminal and the other end connected to a signal line and configured to transfer an RF signal, and a diode disposed between the input terminal and the transmission line or between the output terminal and the transmission line, the diode being configured to control whether or not to transmit the RF signal. In another aspect, an RF switch includes a transmission line having one end connected to an input terminal and the other end connected to an output terminal, and a diode disposed between the input terminal and the transmission line or between the output terminal and the transmission line, the diode being configured to control whether or not to transmit the RF signal. Here, a CRLH (Composite Right/Left-Handed) transmission line is employed as the transmission line.

Abstract: The present invention relates to a power divider and a power combiner employing dual band-Composite Right/Left-Handed (CRLH) transmission lines. A power divider including an input terminal and two output terminals according to the present invention includes two transmission lines each having two terminals connected to the input terminal and the output terminals, respectively, and two short-stubs having one terminals connected to the output terminals, respectively, and the other terminals connected to grounds. The transmission line may employ a first dual band-CRLH transmission line having a double value of a termination impedance, which is substantially connected to the output terminal, as a characteristic impedance, and the short-stub may employ a second dual band-CRLH transmission line, which has substantially the same value as that of the termination impedance as a characteristic impedance.

Abstract: The present invention provides an RF switch, including a diode adapted to operate as a switch when a control current is applied thereto, a first CRLH transmission line of a ? degree phase, which provides one signal transfer path from a terminal 1 to a terminal 2 when the diode is shorted due to application of a control current, and a second CRLH transmission line of a ?-180 degree phase, which has a 180 degree phase difference from that of the first CRLH transmission line and provides the other signal transfer path from the terminal 1 to the terminal 2. The present invention provides an RF switch having a broad-band characteristic by employing a CRLH transmission line. More specifically, the present invention provides a ring-shaped RF switch, which has a broad-band characteristic and can also be miniaturized at a low frequency band, by employing a CRLH transmission line having a 180 degree phase difference in a broad band.

Abstract: There is disclosed a multi-band RFID reader, including a duplexer for separating a data signal received from a tag according to a frequency band, a directional coupler for diverging a part of the signal separated through the duplexer, a Digital Signal Processor (DSP) for determining a frequency band of the diverged signal and generating a control signal based on the determination result, and Radio Frequency (RF) switch for turning on/off transmission/reception modes in response to the control signal of the DSP. The multi-band RFID reader can read signals received from various kinds of tags by employing a multi-frequency band irrespective of frequency bands.

Abstract: A sealing element and a sealing method for sealing both ends of an anode-supported tubular solid oxide fuel cell. The sealing element utilizes a coupling tube having one end opened to an exterior and a second end with a perforation hole, in which the coupling tube is formed with an internal cavity having a shape corresponding to an external appearance of an end portion of a fuel cell. A flow tube having a hollow section axially extends outwards from the second end of the coupling tube while communicating with the perforation hole. The sealing method involves cleaning the sealing element and fuel cell, surrounding an outer peripheral surface of an electrolyte layer on the ends of the fuel cell with a metallic filler material, inserting the fuel cell in a connection tube of the sealing element, heating and melting the filler material, and solidifying the melted filler material.

Abstract: The present invention relates to an apparatus and method for controlling a hybrid motor, and more particularly, to an apparatus and method for controlling a hybrid motor, which uses a permanent magnet instead of a field coil for a rotor, winds a coil round a stator in a multi-phase independent parallel manner, fixes a rectifying type encoder to the rotor and connects a sensor to a driving circuit to smoothly start and rotate the hybrid motor, simplifies the configuration of the hybrid motor and reduce the manufacturing cost of the hybrid motor The apparatus for controlling a hybrid motor having a multi-phase independent parallel stator coil comprises: an encoder attached to a rotor of the hybrid motor and operated in cooperation with a sensor in order to sense the pole of the rotor; the sensor for outputting a sensor signal indicating the polo of the rotor, sensed by the encoder; a speed input unit for generating a speed instruction signal for driving the motor; a power switching circuit for generating signal

Abstract: An anode-supported flat-tubular solid oxide fuel cell stack includes a plurality of fuel cells and a plurality of connector plates. Each of the fuel cells includes a supported tube having semi-cylinder parts and plate parts, a connector coated on an upper plate of the supported tube as a way to be positioned at the center of the upper plate, an electrolyte layer partly coated on an external surface of the supported tube except for a portion of the supported tube coming into contact with the connector, and an air electrode coated on an external surface of the electrolyte layer. Each of the connector plates includes a lower connector plate, middle connector plates, and an upper connector plate. A plurality of gas channels are formed on the middle and lower connector plates. The anode-supported flat-tubular solid oxide fuel cell stack has a large capacity, improved power density, and reduced production costs.

Abstract: Disclosed are a sealing element and a sealing method for sealing both ends of an anode-supported tubular solid oxide fuel cell. The sealing element includes a coupling tube having a first end portion opened to an exterior and a second end portion having a perforation hole, in which the coupling tube is formed with an internal cavity having a shape corresponding to an external appearance of an end portion of the fuel cell; and a flow tube extending outward from the center of the second end portion of the coupling tube and being formed with a hollow section, which axially extends while communicating with the perforation hole of the coupling tube.

Abstract: Disclosed is an anode-supported flat-tubular solid oxide fuel cell stack, which includes an anode-supported tube having semi-cylinder parts and plate parts, thereby securing a combined structure of a tube-type and a plate-type anode-supported body, and a method of fabricating the same. The anode-supported flat-tubular solid oxide fuel cell stack includes a plurality of fuel cells and a plurality of connector plates. Each of the fuel cells includes a supported tube having the semi-cylinder parts and plate parts, a connector coated on an upper plate of the supported tube as a way to be positioned at the center of the upper plate, an electrolyte layer partly coated on an external surface of the supported tube except for a portion of the supported tube coming into contact with the connector, and an air electrode coated on an external surface of the electrolyte layer. Additionally, each of the connector plates includes a lower connector plate, one or more middle connector plates, and an upper connector plate.

Abstract: Disclosed is an anode-supported tubular solid oxide fuel cell stack, in which a thin and dense electrolyte layer and an air electrode are coated in good order on the surface of a porous anode-supported tube extruded by use of a slurry dipping process useful in mass production of a fuel cell, thereby the stable fuel cell stack with high mechanical strength is formed, and method of fabricating the anode-supported tubular solid oxide fuel cell stack. After a plurality of unit cells for anode-supported tubular solid oxide fuel cell stacks with excellent electric conductivity and a smooth current flow are inexpensively produced, the unit cells are stacked and combined with a plurality of metal connector plates having semicircular grooves for mounting unit cells thereon to fabricate a desired fuel cell stack.

Abstract: A method of making and fuel electrode-supported solid oxide fuel cell (SOFC). For manufacturing the SOFC, YSZ powder containing 30 to 50 vol % of Ni is mixed with carbon powder to give a fuel electrolyte slurry which is pre-sintered, coated on a fuel electrode tube, and then the coated tube is sintered. An air electrode slurry made of (La, Sr)MnO3 powder is coated on the electrolyte-coated tube and sintered. The fuel electrode of the metal (Ni/ceramic (YSZ) cermet of the SOFC is a support and the electrolyte layer underlaying the air electrode is coated as a thin film. At about 1,000° C., the Ni components of the fuel electrode are connected to each other like a mesh, improving the fuel electrode strength while the porous fuel electrode allows the sufficient permeation of fuel gas, thereby providing a large economical profit in the production cost without degradation of fuel cell performance.

Abstract: A method for fabricating an electrode and membrane assembly (MEA) for polymer electrolyte membrane fuel cells. The MEA comprises a polymer electrolyte membrane on each side of which an electrocatalyst layer is provided in a melted state. A perfluorosulfonyl fluoride copolymer powder ranging, in particle size distribution, from 20 to 200 &mgr;m is hot-pressed at 200-250° C. to give a pre-formed sheet whose opposite sides are then coated with a catalyst ink consisting of Pt/C powder, glycerol and water. This catalyst ink-coated preformed sheet is again subjected to hot pressing at 200-250° C. to embed the catalyst ink into the pre-formed sheet. Hydrolysis in NaOH/methanol or H2SO4 solution converts the membrane of the sheet from a non-ionized form to an ionized form.

Abstract: Disclosed are a metallic interconnection material for solid oxide fuel cells and a preparation method thereof. The metallic interconnection material has two fine microstructural phases in which 5-25% by volume of LaCrO.sub.3 is dispersed at the grain boundaries of Cr particles. It can be prepared by mixing 75-95% by volume of a Cr powder and 5-25% by volume of an LaCrO.sub.3 powder, together with a solvent and a binder, in a mill, molding the mixture into a predetermined shape after drying, and sintering the molded shape at approximately 1,500.degree. C. for 10 hours in an Ar atmosphere with 5 vol % of hydrogen to give an LaCrO.sub.3 -dispersed Cr alloy. The LaCrO.sub.3 -dispersed Cr alloy shows high electric conductivity by virtue of the growth inhibition of Cr particles during sintering and high chemical stability by virtue of the presence of the rare earth metal, La, meeting meet the requirements for the interconnection materials for solid oxide fuel cells.

Abstract: There is disclosed a method for manufacturing an electrode for phosphate type fuel cells, utilizing a combination of a coating process and a rolling process. Carbon paper is waterproofed to give an electrode support. Separately, platinum-dispersed carbon powder (Pt/C) is added in a solvent and mechanically stirred to give a homogeneous mixture which is, then, added with a PTFE emulsion at an amount of about 40-55 wt % and stirred. Another stirring is executed in the presence of a bridge-builder and a peptization agent, to produce an electrocatalyst layer slurry. Using a coating apparatus, the electrocatalyst slurry is coated upon the electrode support in a uniform thickness. The resulting structure is dried for 30 min in an inert atmosphere of 225.degree. C. to completely remove the solvent from the catalyst layer, passed through a rolling apparatus and subjected to sintering for 30 min in an inert atmosphere of 350.degree. C., to produce the electrode.