127results about How to "Impedance matching" patented technology

A broadband antenna has a substrate, a coupling conductor, a conductor string, a ground conductor and a ground plane. The coupling conductor has a first coupling member and a second coupling member being separated from each other. The conductor string and the ground conductor are connected to the second coupling member. The conductor string extends along a direction opposite to the second coupling member. The ground conductor is connected to the ground plane. The broadband antenna uses the coupling conductor and the ground conductor to adjust input impedance for impedance match. The conductor string functions as a multi level resonance circuit to increase impedance bandwidth.

A wireless communication high-frequency circuit in which a broadband amplifier is shared between multiple communication frequency bands and multiple duplexers are used in order to support the multiple communication frequency bands to improve the transmission efficiency includes a first impedance matching circuit between an output port of an amplifier and a relay switch. A first signal path extends from the output port of the amplifier to the ground in the first impedance matching circuit. An inductor and a variable capacitance element are provided on the first signal path. Second impedance matching circuits are provided between output ports and the input port of the relay switch and transmission signal input ports of duplexers, respectively.

A wireless IC device includes a wireless IC chip, a coupling electrode, and a radiation plate. The coupling electrode includes coupling portions arranged to be coupled to the wireless IC chip and a pair of opposing ends. The pair of opposing ends are capacitively coupled to each other and oppose the radiation plate to be coupled to the radiation plate. The wireless IC chip uses the radiation plate as an antenna to transmit and receive signals having certain frequencies to and from an RFID system.

A connector includes a connector housing having a plurality of terminal receiving chambers arranged in a row, and a plurality of terminals which are connected respectively to end portions of a plurality of wires of a cable, and are received respectively in the terminal receiving chambers. Wall reduction portions are formed respectively in partition walls of the connector housing, each interposed between the adjacent terminal receiving chambers, so that an impedance of the connector can be matched with an impedance of the cable.

A power supply device supplies electric power to a power receiving device including a power receiving unit in a non-contact manner. The power supply device includes a power source device that generates electric power with a predetermined frequency; a power transmitting unit that receives the electric power from the power source device, and that resonates with the power receiving unit through an electromagnetic field, thereby transmitting the electric power to the power receiving unit in the non-contact manner; a detection device that detects reflected electric power to the power source device; a communication device that receives information regarding a power receiving situation in the power receiving device; and a control device that controls electric power transmission from the power transmitting unit based on the information regarding the power receiving situation and the reflected electric power.

A low voltage data transmitting circuit (LVDTC) may be connected to a first transmission line that transmits a first voltage signal to a receiver and a second transmission line that transmits a second voltage signal to the receiver. The LVDTC includes a first resistor coupled to the first transmission line, a second resistor coupled to the second transmission line, and a control unit coupled to the first transmission line and the second transmission line, the control unit being configured to control voltage levels of the first and second voltage signals such that the voltage levels of the first and second voltage signals are higher than a ground voltage level of the receiver, wherein the first and second voltage signals may constitute a differential pair.

The invention provides an impedance-adjustable type refrigerating machine. The impedance-adjustable type refrigerating machine comprises an impedance adjusting unit, a refrigerating unit and a phase modulating unit which are sequentially connected, wherein the impedance adjusting unit is used for regulating acoustic impedance of a refrigerating machine inlet, namely a joint of the driver and the impedance adjusting unit to match acoustic power of pressure waves input by the driver; the phase modulating unit is used for adjusting the impedance of a working gas in the refrigerating unit; and the refrigerating unit is used for refrigerating the phase-modulated working gas. According to the impedance-adjustable type refrigerating machine, the impedance adjusting unit is arranged, so that an impedance phase angle of the refrigerating machine inlet can be adjusted to any needed value for enabling the refrigerating machine inlet to match with the driver better, and therefore, the driver and the refrigerating unit simultaneously work at the most ideal state.

A low noise amplifier (LNA) has a selectable bypass signal path integrated into the same integrated circuit (IC) as the amplifier components. In a normal mode of operation, an integrated mode switch allows an appropriate biasing signal to be applied LNA transistors, which function to amplify an input signal and produce an amplified output signal. In an attenuation mode, which is activated to handle large input signals, the LNA transistors are switched off and the input signal is attenuated by a voltage divider, which provides an attenuated output on a signal path that bypasses the LNA amplifier. An attenuation switching signal not only operates the mode switch in the LNA, but also selects between the normal and bypass outputs of the LNA, for further amplification downstream of the LNA.

Antenna devices that include a frequency selective surface (FSS) resistive card (R-card) to suppress ground plane interference are provided. The antenna device can include a tightly coupled dipole array (TCDA), and the FSS R-card can be a saw-tooth ring that only attenuates the intended frequencies. The antenna device can be an extremely wideband phased array with integrated feeding network and spatial scanning down to 60°.

A connector with controlled impedance includes at least one set of differential signal terminals with an associated ground terminal. The ground terminal has a symmetric configuration, while the two differential signal terminals have asymmetric configurations. The asymmetric configurations permit capacitive coupling to occur primarily between the two differential signals in an area of the connector where the inductance of the connector would be high. The two differential signal terminals flank the ground terminal.

A wideband low-noise amplifier includes a source-degenerated common-source amplifier, a common-gate amplifier, and a matching frequency band determiner. The source-degenerated common-source amplifier is configured to amplify an input signal to output a first signal that is opposite in phase to the input signal. The common-gate amplifier is connected in parallel to the source-degenerated common-source amplifier to amplify the input signal to output a second signal that has the same phase as the input signal. The matching frequency band determiner is configured to isolate an input terminal of the source-degenerated common-source amplifier and an input terminal of the common-gate amplifier and determine a matching frequency band.

Specifically, provided is a horizontal-cavity surface-emitting laser including, on a semiconductor substrate: a cavity structure; a waveguide layer; and a reflecting part, wherein a first electrode provided on the semiconductor substrate along side regions of the cavity structure and the reflecting part and a second electrode provided on the main surface of the cavity structure are provided, the first electrode includes an electrode (1) that is provided around one side region of the reflecting part located in the direction intersecting with the traveling direction of light guided through the waveguide layer and an electrode (2) provided around one side region of the cavity structure and the other side region of the reflecting part that are located in the direction parallel with the traveling direction of light guided through the waveguide layer, and the shape of the electrode (2) has different widths at at least two positions.

In a mobile radio apparatus, a matching circuit is selected to meet the detected condition detected by a switching control unit. Matching of the antenna to the RF circuit can be optimized and the antenna gain deterioration can be prevented.

The embodiment of the present invention provides an optical device which relates to the optical communication field, and can satisfy the impedance matching requirement of the high frequency signal transmission. The optical device comprises a first substrate, a second substrate and a transfer plate, a first conductive access is arranged on the upper surface of the first substrate, a second conductive access is arranged on the lower surface of the first substrate, and a third conductive access is arranged on the upper surface of the second substrate. A microstrip line structure is arranged on the transfer plate and comprises a transfer line arranged on the upper surface of the transfer plate, and the upper surface of the second substrate is opposite to the lower surface of the first substrate, wherein the second conductive access is attached to the third conductive access, and the transfer plate is arranged above the upper surface of the second substrate and is located in the third conductive access. One end of the transfer line is electrically connected with the first conductive access by threading, and the other end is connected with an internal element in the optical device by threading. The embodiment of the present is used for the optical device manufacture.

Transducer for converting mechanical stress into electric signals, which transducer is composed of at least one electromechanical sheet (107,108) and is capable of converting mechanical stress into electric signals and in which transducer at least one of the electrodes required by the electromechanical sheet is disposed on the surface of one or more thin and flexible dielectric materials, said electrodes (109) forming electrically conductive surfaces of the transducer for connecting the transducer to a signal processing device, said electromechanical sheets being permanently charged cellular electret film and which transducer is constructed of a unitary, thin and flexible layered laminate structure.

The invention discloses a broadband low power consumption and low noise amplifier applied to a wireless sensor network, which comprises an input matching circuit, a first-stage amplifying circuit and a second-stage amplifying circuit which are connected in sequence, and the first-stage amplifying circuit adopts resistance feedback Common source circuit structure, the second stage amplifier circuit adopts active parallel feedback common gate circuit structure.

The present invention has an object to provide a substrate with a built-in functional element, including the functional element above a metal plate, in which crosstalk noise between signal wirings can be reduced and higher characteristic impedance matching can be achieved. An aspect of the present invention provides a substrate with a built-in functional element, including: a metal plate that includes a concave portion and serves as a ground; the functional element that is placed in the concave portion and includes an electrode terminal; a first insulating layer that covers the functional element and is placed in contact with the metal plate; a first wiring layer including first signal wiring that is opposite the metal plate with the first insulating layer being interposed therebetween; a second insulating layer that covers the first wiring layer; and a ground layer formed of a ground plane that is opposite the first wiring layer with the second insulating layer being interposed therebetween.

Provided is an antenna system for terrestrial broadcasting. The antenna system has a dipole antenna probe receiving a broadcast signal, a signal amplifier amplifying the received broadcast signal, an antenna matching unit matching impedances between the antenna probe and the signal amplifier, an output matching unit matching impedances between an output signal of the signal amplifier and an input terminal of a broadcast receiver to which the output signal is fed, and a bias extractor converting power received from the broadcast receiver into power needed for driving the signal amplifier and supplying the converted power to the signal amplifier.

The invention provides a nitrogen-doped and carbon-coated magnetic nanoparticle composite microspheres and a preparation method thereof, and belongs to the technical field of materials with an electromagnetic function. According to the method, a glycerin metal complex and a nitrogenous organic compound are taken as main raw materials. A monodispersed glycerin metal complex precursor is prepared according to a self-template method at first; then the surface of the precursor is coated to form a shell by virtue of in-situ polymerization for nitrogenous organic monomers, and a carbon source and anitrogen source are introduced; and finally, calcining is carried out under an inert gas, and a core is subjected to thermal decomposition to form magnetic nanoparticles while the shell is carbonizedto form nitrogen-doped carbon. The nitrogen-doped and carbon-coated magnetic nanoparticle composite microspheres are green and environment-friendly, and efficient and time-saving in preparation process, and suitable for being prepared in a large scale; the electromagnetic parameters of the composite microspheres and the sizes of the magnetic nanoparticles can be regulated and controlled by changing the mass ratio of metal salt to the nitrogenous organic monomers, and an annealing temperature, so that impedance matching and attenuation characteristic are achieved; and the prepared composite microspheres are high in absorption intensity for electromagnetic wave, wide in effective absorption frequency band, easy to prepare in a large scale, and capable of meeting many use needs.