Abstract: A multi-frequency antenna includes a first antenna element, a second antenna element, a connection element, a third antenna element and a shorted element. The connection element is connected between the first antenna element and a neighborhood portion of the third antenna element. A feeding point is located in or nearby a first junction between the connection element and the first antenna element or located in the connection element. The shorted element is connected between the second antenna element and the grounding plane. The shorted element extends from a second junction between the second antenna element and the third antenna element to the grounding plane. The first conductive path that extends from the feeding point to the other end of the shorted element is substantially equal to a second conductive length that extends from the feeding point to the free end of the first antenna element.

Abstract: A multiband antenna comprises a feeder member, a radiation conductor, a short-circuit member, a grounding plane and a feeder cable. The feeder member has a first coupling side. Two end of the short-circuit member are respectively connected with the radiation conductor and the grounding plane. The short-circuit member has a second coupling side parallel to and conformable to the first coupling side with a gap existing therebetween. The feeder cable has a central wire and an outer wire respectively connected with the feeder member and the grounding plane. The feeder member transmits a high-frequency fed-in signal to the short-circuit member in a capacitive coupling way. The multiband antenna of the present invention has a simplified antenna structure, a miniaturized size and wide frequency bands.

Abstract: The invention provides a lamp circuit of a light emitting device, which comprises a capacitor, a rectification unit, a current limiting unit, and a light emitting device. The capacitor is connected to the two lamp contacts of the lamp holder of the electrical ballast to change the resonant frequency of the resonant circuit of the electrical ballast. The rectification unit is connected to the capacitor, and utilized to rectify a sine-wave voltage to a direct current voltage. The current limiting unit is connected to the rectification unit, outputting a direct current corresponding to the direct current voltage. The light emitting device is connected to the current limiting unit and the rectification unit to generate a light source. With the invention, the light emitting device can be installed directly in a lamp holder of a conventional fluorescent lamp.

Abstract: A standard receptacle connector has an insulating housing, multiple first terminals, multiple second terminals, a plug detecting terminal and a shell. The first and second terminals and the plug detecting terminal are mounted on the insulating housing. The shell covers the insulating housing and all of the terminals. The plug detecting terminal is capable of being connected to a controlling circuit incorporated in a PCB on which the standard receptacle connector is mounted and selectively activates the controlling circuit to provide power to an external plug connector that is inserted in and connected to the standard receptacle connector.

Abstract: A limiting current circuit that has output short circuit protection is connected to an external voltage source and comprises an output terminal, an input current unit, a driving transistor, a voltage control resistor, a voltage control transistor and a delay unit. The output terminal is connected to a load and has an output current. The driving transistor has an internal resistance, a drain current and a gate voltage. The voltage control resistor has a resistor voltage. The voltage control transistor has an internal resistance and a parasitic capacitance. The delay unit makes the resistor voltage charging the parasitic capacitance to extend the period of lower internal resistance of the voltage control transistor and the period of higher internal resistance of the driving transistor, makes the internal resistance of the voltage control transistor is less than the internal resistance of the driving transistor when the load is shorted.

Abstract: A connector includes an insulated body with a slot to receive therein a terminal module and a casing entirely enclosing the insulated body. An arm has at least two extensions respectively adapted to two oppositely formed sidewalls of the insulated body and each is provided with a boss formed on a distal end of the at least two extensions. At least two through holes are adapted to be defined in each of the two sidewalls of the insulated body to receive therein the bosses.

Abstract: A standard receptacle connector has an insulating housing, multiple first terminals, multiple second terminals, a plug detecting terminal and a shell. The first and second terminals and the plug detecting terminal are mounted on the insulating housing. The shell covers the insulating housing and all of the terminals. The plug detecting terminal is capable of being connected to a controlling circuit incorporated in a PCB on which the standard receptacle connector is mounted and selectively activates the controlling circuit to provide power to an external plug connector that is inserted in and connected to the standard receptacle connector.

Abstract: A connector includes a receptacle and terminal modules each inserted into the receptacle and having a base and a plurality of terminals securely extended through the base. A block is formed on a side of the base and a cutout is defined on the side of the base to structurally correspond to the block so that two adjacent bases are connected together.

Abstract: A connector includes terminal elements each having a base, multiple terminals securely received in the base with first ends and second ends, positioning blocks formed on one side face of the base and cutouts defined in a top portion of the base, a casing having receiving spaces defined in the casing for receiving the second ends of the terminals, positioning holes each defined to communicate with a corresponding one of the receiving spaces to position therein the second end of the terminals and ribs formed inside the casing to isolate each of the terminals from influence from the other terminals and an insert having receiving holes defined to receive therein the terminal elements and transverse columns corresponding to the cutouts of the terminal elements such that with the transverse columns received in the corresponding cutouts, connection between the insert and the terminal elements is secured.

Abstract: A male connector has an insulating housing, multiple signal terminals, and multiple grounding modules. The signal terminals are mounted through the insulating housing. The grounding terminal modules are mounted through the insulating housing. Each grounding terminal module is integrally formed into one piece and has multiple grounding terminals. Adjacent grounding terminals are connected integrally to each other so that the grounding terminals of each grounding terminal module are arranged in a line. The integrally formed ground terminal modules reduce a total tolerance of the grounding terminals and increase the production rate of the male connector.

Abstract: A driving circuit for light emitting elements comprises a rectifying unit, a first constant current unit, a first driving transistor, a first voltage control unit and at least one first light emitting element. The rectifying unit has a first terminal and a second terminal, is connected to an external power source that provides alternating current power that is sinusoidal and has alternating negative and positive segments, inverts the negative segments of the AC power to positive segments and forms a pulsating direct current voltage. The first constant current unit has a first end and a second end. The first driving transistor comprises a first gate, a first drain and a first source. The first voltage control unit comprises a first variable resistor and a first bias control element. The first light emitting element has a first end and a second end.

Abstract: The present invention is a light emitting diode lamp structure, which comprises a heat dissipating plane, a light emitting housing and a base. The light emitting housing further comprises a casing and a first hollow region. The heat dissipating plane is partly covered by the casing and the rest of the heat dissipating plane is shown in the first hollow region. The part of the heat dissipating plane covered by the casing further includes a plurality of LEDs. The base is mounted with the light emitting housing and electrically engaged with the LEDs.

Abstract: A multi-curvature antenna comprises a radiation conductor and a support element. The outer rim of the radiation conductor is fabricated into an outer ring having an arc-shape surface, and the arc-shape surface has a notch. The central portion of the radiation conductor is patterned to form a conduction path. The support element carries the radiation conductor. A method for fabricating a multi-curvature antenna comprises providing a plane metallic sheet; pressing or stamping the metallic sheet to form a radiation conductor having an outer ring with an arc-shape surface; pattering the central portion of the radiation conductor into a predetermined conduction path and punching the outer ring to form a connection member; and cutting off the connection member to complete a multi-curvature antenna.

Abstract: The invention provides a light emitting device driving circuit, comprising a rectification unit, a current limiting unit and a load. The load comprises a first light emitting device, a reverse voltage providing unit and a second light emitting device connected in serial. When the rectification unit rectifies an alternate current voltage to output a direct current voltage, and the current limiting unit limits the direct current in a predetermined value, the direct current is provided to the first light emitting device or the second light emitting device for operation. The reverse voltage providing unit provides a reverse voltage to reduce the total operating voltage of the light emitting devices in order to enhance the driving efficiency and the power factor.

Abstract: A standard receptacle connector has an insulating housing, multiple first terminals, multiple second terminals, a plug detecting terminal and a shell. The first and second terminals and the plug detecting terminal are mounted on the insulating housing. The shell covers the insulating housing and all of the terminals. The plug detecting terminal is capable of being connected to a controlling circuit incorporated in a PCB on which the standard receptacle connector is mounted and selectively activates the controlling circuit to provide power to an external plug connector that is inserted in and connected to the standard receptacle connector.

Abstract: An optical fiber connector in accordance with the present invention prevents its components from being assembled incorrectly and comprises a distal housing, a core tube, an extension tube, a spring, a proximal housing and an end tube. The distal housing has a slot. The core tube is mounted longitudinally in the distal housing and has a distal tube and a proximal tube. The extension tube is mounted around and connected to the proximal tube. The spring is mounted around the proximal tube of the core tube and the extension tube. The proximal housing is connected to the distal housing and mounted around the core tube, the extension tube and the spring and has an assembly protrusion that is mounted slidably in the slot to prevent the proximal housing from being connected to the distal housing incorrectly.

Abstract: An antenna with a feed cable support member comprises a first conductor, a pivotal shaft, a second conductor and a feed cable. The first and second conductors respectively connect with two sides of the pivotal shaft. The pivotal shaft enables the first and second conductors to open or close by 0-180 degrees. The support member is connected with one end of the pivotal shaft and disposed inside the slot between the first and second conductors. The feed cable has a high frequency signal feeding terminal fixed to the surface of the support member. Based on the principle of an aperture coupled antenna, the present invention adds the support member into the slot, whereby the high frequency signal feeding terminal can be directly fixed to the surface of the support member, and whereby the operating frequency and impedance matching can be fine tuned via the support member.

Abstract: A backplane connector has a housing and multiple terminal assemblies. The housing has a top, a bottom and an expansion slot defined in the top. The terminal assemblies are mounted in the bottom of the housing and each terminal assembly has a first insulating base, a second insulating base and two pairs of signal transmission terminals. The first and second insulating bases are connected to each other. The pairs of the signal transmission terminals are mounted respectively through the first and second insulating bases. Each signal transmission terminal has a curved guide element and an angled protruding element. The curved guiding elements smoothly contacts and guides an electrical connecting portion of a PCB expansion card to move so that the PCB expansion card is installed easily in the expansion slot of the backplane connector.

Abstract: A male connector has an insulating housing, multiple signal terminals, and multiple grounding modules. The signal terminals are mounted through the insulating housing. The grounding terminal modules are mounted through the insulating housing. Each grounding terminal module is integrally formed into one piece and has multiple grounding terminals. Adjacent grounding terminals are connected integrally to each other so that the grounding terminals of each grounding terminal module are arranged in a line. The integrally formed ground terminal modules reduce a total tolerance of the grounding terminals and increase the production rate of the male connector.