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101results about How to "Reduce signal reflection" patented technology
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Radome and shroud enclosure for reflector antenna
ActiveUS8077113B2Improved choke effect upon signal energyShorten the lengthRadiating element housingsAntenna couplingsEngineeringRadome
An enclosure for the open end of a reflector antenna includes a cylindrical shroud coupled to a distal end of the reflector antenna, the shroud generally coaxial with a longitudinal axis of the reflector antenna. A retaining band is coupled to an inner diameter of the shroud, proximate a distal end of the shroud. The retaining band is provided with a retaining groove open radially inward towards the longitudinal axis. The retaining groove provided with a bottom extending radially outward beyond an outer diameter of the shroud. A radome is seated within the retaining groove.
Owner:COMMSCOPE TECH LLC
Circularly-polarized-wave patch antenna which can be used in a wide frequency band
InactiveUS6952183B2Wide bandImprove axle ratioSimultaneous aerial operationsRadiating elements structural formsAxial ratioCoaxial cable
A circularly-polarized-wave patch antenna includes a main body having a patch electrode provided with two feeding points and a circuit for generating a phase difference of 90° between signals supplied to the feeding points. A Wilkinson distribution circuit is provided between the 90°-phase-difference generating circuit and a coaxial cable (feeder line) so as to improve a reflection characteristic. The patch antenna includes two feeding points, and thus a favorable axial ratio characteristic can be obtained in a wide band. Also, a favorable reflection characteristic can be obtained in a wide band because of the Wilkinson distribution circuit. Accordingly, the patch antenna can be used in a wider frequency band.
Owner:ALPS ALPINE CO LTD
High density memory module with in-line bus switches being enabled in response to read/write selection state of connected RAM banks to improve data bus performance
InactiveUS6070217AMaximize memory densityReduce signal reflectionMemory adressing/allocation/relocationSolid-state devicesCapacitanceBiological activation
Data line loading on high density modules with multiple DRAMs is minimized permitting the maximum memory density of systems of otherwise limited density to be increased without an ensuing performance degradation due to data line capacitive loading. First the single or dual in-line memory module (SIMM or DIMM) includes in-line bus switches. The bus switches are between the SIMM or DIMM module tabs (system) and random access memory devices (RAM) and are either in a high impedance (off) or active state depending on the READ / WRITE state of the RAM. When in the high impedance state, the effective loading of the module is that of the bit switch device. The logic for determining the READ / WRITE state may be embedded in an application specific integrated circuit (ASIC) that monitors bus activity and controls activation of the bus switches, be provided by a memory controller or, generated by the RAM itself. The bus switches are active when the RAM is performing a read or a write and inactive otherwise. The RAM is Fast Page Mode (FPM) and Extended Data Output (EDO) or Synchronous DRAM (SDRAM).
Owner:IBM CORP
Electrical contact for downhole drilling networks
InactiveUS6929493B2Robust electrical connectionReduce signal reflectionDrilling rodsSecuring/insulating coupling contact membersElectricityElectrical conductor
An electrical contact system for transmitting information across tool joints while minimizing signal reflections that occur at the tool joints includes a first electrical contact comprising an annular resilient material. An annular conductor is embedded within the annular resilient material and has a surface exposed from the annular resilient material. A second electrical contact is provided that is substantially equal to the first electrical contact. Likewise, the second electrical contact has an annular resilient material and an annular conductor. The two electrical contacts configured to contact one another such that the annular conductors of each come into physical contact. The annular resilient materials of each electrical contact each have dielectric characteristics and dimensions that are adjusted to provide desired impedance to the electrical contacts.
Owner:INTELLISERV LLC
Tunable microwave devices with auto-adjusting matching circuit
InactiveUS6864757B2Reduce signal reflectionReduce reflectionMultiple-port networksAmplifiers wit coupling networksElectrical conductorCoplanar waveguide
Owner:NXP USA INC
Data transmission circuit for memory subsystem, has switching circuit that selectively connects or disconnects two data bus segments to respectively enable data transmission or I/O circuit connection
InactiveUS6871253B2Improve acceleration performanceReduce reflectionEnergy efficient ICTDigital data processing detailsElectricityHigh speed memory
A method and associated apparatus is provided for improving the performance of a high speed memory bus using switches. Bus reflections caused by electrical stubs are substantially eliminated by connecting system components in a substantially stubless configuration using a segmented bus wherein bus segments are connected through switches. The switches disconnect unused bus segments during operations so that communicating devices are connected in an substantially point-to-point communication path.
Owner:MICRON TECH INC
Step attenuator apparatus
InactiveUS20110316645A1Reduce signal reflectionImprove isolationCoupling devicesUltrasound attenuationControl signal
A step attenuator apparatus is provided, having an attenuation ratio which is switchable according to a control signal. Multiple variable attenuators are connected in series. Each variable attenuator includes a first terminal, a second terminal, multiple paths having different attenuation ratios, a first switch that can be connected to one end of a desired path selected from among the multiple paths, and a second switch that can be connected to the other end of a desired path selected from among the multiple paths. When a control signal is an instruction to set the step attenuator apparatus to a disconnected state, a control unit connects the first switch of the first-stage variable attenuator to one of the multiple paths, and connects the second switch of the first-stage variable attenuator to a different one of the multiple paths.
Owner:ADVANTEST CORP
Radome and Shroud Enclosure for Reflector Antenna
ActiveUS20100315307A1Improved choke effect upon signal energyShorten the lengthRadiating element housingsAntenna couplingsEngineeringRadome
An enclosure for the open end of a reflector antenna includes a cylindrical shroud coupled to a distal end of the reflector antenna, the shroud generally coaxial with a longitudinal axis of the reflector antenna. A retaining band is coupled to an inner diameter of the shroud, proximate a distal end of the shroud. The retaining band is provided with a retaining groove open radially inward towards the longitudinal axis. The retaining groove provided with a bottom extending radially outward beyond an outer diameter of the shroud. A radome is seated within the retaining groove.
Owner:COMMSCOPE TECH LLC
Printed circuit board
InactiveUS20110203834A1Reduce signal reflectionQuality improvementPrinted circuit aspectsMeanderDifferential signaling
There is provided a printed circuit board having a differential signal transmission line composed of non-skew-adjusting portions and skew-adjusting portions. The non-skew-adjusting portion consists of parallel conductive traces spaced apart by a spacing. The skew-adjusting portion consists of a pair of meander traces for the skew adjustment. The skew-adjusting portion include convex transmission line segments and concave transmission line segments. The convex transmission line segment has parallel traces having a differential trace pair spacing greater than the differential trace pair spacing in the non-skew-adjusting portion. The concave transmission line segment has parallel traces having a differential trace pair spacing smaller than the differential trace pair spacing in the non-skew-adjusting portion.
Owner:HITACHI LTD
Low voltage differential signaling drivers including branches with series resistors
ActiveUS7595661B2Reduce in quantityMinimizes signal reflectionElectric pulse generatorDifferential amplifiersLow voltageResistor
A low voltage differential signal driver includes first and second current sources, a first branch and a second branch. The first branch includes at least two transistors and at least two resistors between them that are all connected in series between the first and second current sources, to define a first node between adjacent resistors that is configured to transmit and receive differential signals. The second branch also includes at least two transistors and at least two resistors between them that also are all connected in series between the first and second current sources, to define a second node between adjacent resistors that is also configured to transmit and receive differential signals.
Owner:SAMSUNG ELECTRONICS CO LTD
Improved electrical contact for downhole drilling networks
InactiveUS20050074988A1Robust electrical connectionReduce signal reflectionRotary current collectorDrilling rodsElectricityElectrical conductor
An electrical contact system for transmitting information across tool joints while minimizing signal reflections that occur at the tool joints includes a first electrical contact comprising an annular resilient material. An annular conductor is embedded within the annular resilient material and has a surface exposed from the annular resilient material. A second electrical contact is provided that is substantially equal to the first electrical contact. Likewise, the second electrical contact has an annular resilient material and an annular conductor. The two electrical contacts configured to contact one another such that the annular conductors of each come into physical contact. The annular resilient materials of each electrical contact each have dielectric characteristics and dimensions that are adjusted to provide desired impedance to the electrical contacts.
Owner:INTELLISERV
Low voltage differential signaling drivers including branches with series resistors
ActiveUS20060132179A1Minimizes signal reflectionReduce in quantityElectric pulse generatorDifferential amplifiersLow voltageResistor
A low voltage differential signal driver includes first and second current sources, a first branch and a second branch. The first branch includes at least two transistors and at least two resistors between them that are all connected in series between the first and second current sources, to define a first node between adjacent resistors that is configured to transmit and receive differential signals. The second branch also includes at least two transistors and at least two resistors between them that also are all connected in series between the first and second current sources, to define a second node between adjacent resistors that is also configured to transmit and receive differential signals.
Owner:SAMSUNG ELECTRONICS CO LTD
High frequency transmission line and high frequency board
ActiveUS7193490B2Reduce signal reflectionGood signalCross-talk/noise/interference reductionPrinted circuit aspectsElectrical impedanceSignal reflection
Since a width of an edge portion of a signal line of a first high frequency transmission line is changed with respect to a width of another portion thereof, a deviation of impedances in a connection portion of the first and second high frequency transmission lines can be suppressed, so that signal reflections occurred in the connection portion can be lowered and a signal passing characteristic is improved.
Owner:TDK CORPARATION
Circuit and method for an improved front end in duplex signal communication systems
InactiveUS7010025B1Reduce signal reflectionMinimize powerMultiplex system selection arrangementsTransmission hybrid circuitsTransceiverAdaptive filter
An improved analog front end and methods for increasing the power efficiency of duplex signals on a transmission line are disclosed. The improved analog front end bifurcates a hybrid into a fixed portion and an adaptive portion. The adaptive portion combines a biquad and a summer to produce a filter transfer function suited to compensate for transmission line irregularities. A method for configuring a local transceiver to minimize power requirements at a remote transmitter is disclosed. Broadly the method entails, applying a transmit signal to a front end in the absence of a remote signal; optimizing the transmit signal power; recording the reflected transmit signal; applying an adaptive filter in response to transmission line irregularities; and controllably adjusting the adaptive filter to minimize the amplitude of the reflected version of the transmit signal in the receive path. A method for recovering a remotely generated signal is also disclosed. The method entails, applying a local transmit signal to the front end in the absence of a remote signal; recording a reflected version of the transmit signal in the receive path; controllably adjusting an adaptive portion of the front end to minimize the amplitude of the reflected version of the local transmit signal; and combining a scaled replica of the local transmit signal with a plurality of adaptive filter outputs to recover a remotely generated receive signal from the transmission line.
Owner:IKANOS COMMUNICATIONS
Impedance matching via structure for high-speed printed circuit boards and method of determining same
InactiveUS20070193775A1Suppress couplingEasy transitionPrinted circuit aspectsHigh frequency circuit adaptationsRadiation lossElectrical conductor
An impedance matching conductive via structure that is effectively constructed by selecting an outer conductor and an inner conductor diameter through analytical calculation or numerical simulation, such that impedance of the conductive via structure is matched to the impedance of the conductive signal traces of a printed circuit board. The conductive via structure comprises a conductive barrel that either connects to multiple ground planes or to multiple powers planes and serves as the outer conductor for a coaxial structure that provides a current return path and a matched impedance path of via transition, thus improving the signal transition and reducing signal reflection due to via discontinuity. Moreover, the conductive barrel of the conductive via structure also reduces radiation loss through a parallel plane structure and suppresses coupling between neighboring vias as the energy escaping through the conductive barrel and radiating to other vias is minimized.
Owner:MICRON TECH INC
Differential communication link with skew compensation circuit
ActiveUS20090174448A1Minimize skewReduce signal reflectionPulse automatic controlError detection/correctionTelecommunications linkDifferential signaling
A system and method is presented for reducing skew between the positive and negative components of a differential signal in a high speed communications link. The communications link includes a signal generator producing and transmitting complementary positive and negative signals over separate transmission lines and a receiver receiving the complementary signals. The communication link further includes a skew compensation circuit having a skew detector, a controller, and separate delay and buffer elements for both the positive and negative component of the differential signal. The controller separately controls each of the delay or buffer elements in response to the detected skew between differential signal components.
Owner:MAYO FOUND FOR MEDICAL EDUCATION & RES
High performance optoelectronic packaging assembly
InactiveUS7070340B2Easy to installSimple and accurate and stable optical alignmentLaser detailsCoupling light guidesElectricityConductive materials
Optoelectronic packaging assemblies for optically and electrically interfacing a protected electro-optical device or system to both an optical fiber and to external circuitry. Such assemblies are comprised of body components that are comprised of plastic that coated or plated with a conductive material. Electrical contact pins in the form of transmission lines are used to couple external electrical signals with the package. The optoelectronic packaging assemblies are dimensioned with small cavities and with steps, breaks, walls, and / or fins molded into the body components. The optoelectronic packaging assemblies further include an optical input receptacle for receiving an optical ferrule and an optical fiber. The optoelectronic packaging assembly provides for cooling, such as by heat sink fins and / or a thermal-electric-cooler. The transmission line pins and body components are dimensioned to mate with a standardized circuit board having transmission line traces.
Owner:SILICON BANDWIDTH
Via structure of packages for high frequency semiconductor devices
ActiveUS20050191785A1Increased via-to-via capacitanceIncrease capacitanceSemiconductor/solid-state device detailsPrinted electric component incorporationCapacitanceDevice material
A substrate (300) for a package of high frequency semiconductor devices comprising a planar insulating substrate having a plurality of parallel, planar metal layers (301a, 301b, etc.) embedded in the insulator. The substrate further has at least one pair of parallel, metal-filled vias (302 and 303) traversing the substrate; the vias have a diameter and a distance from each other of at least this diameter. The metal in each via has a sheet-like extension (321a, 321b, etc.) in each of selected planes of said metal layers, resulting in an increased via-to-via capacitance so that the reflection of a high frequency signal is less than 10%.
Owner:TEXAS INSTR INC
1:N MEM switch module
InactiveUS7157993B2Reduce areaReduce the numberElectrostatic/electro-adhesion relaysWaveguide type devicesCapacitancePhase shifted
A 1:N MEM switch module comprises N MEM switches fabricated on a common substrate, each of which has input and output contacts and a movable contact which bridges the input and output contacts when the switch is actuated. The input contacts are connected to a common input node, and the output contacts are connected to respective output lines. Each output line has an associated inductance and effective capacitance, and is arranged such that its inductance is matched to its effective capacitance. The switches are preferably arranged symmetrically about the terminus point of the signal input line. A phase shifter employs at least two switch modules connected together with N transmission lines having different lengths, operated such that an input signal is routed via one of the transmission lines to effect a desired phase-shift.
Owner:TELEDYNE SCI & IMAGING
Directional coupler
ActiveUS9385411B2Reduce signal reflectionSuppress a change in the coupling of the directional couplerWaveguidesCoupling devicesLow-pass filterCoupling
A directional coupler includes a main line and a subline. The main line connects an input port and an output port. The subline connects a coupling port and a terminal port. The subline includes a first coupling line section connected to the terminal port, a second coupling line section connected to the coupling port, and a low-pass filter. The low-pass filter includes an inductor provided between the first and second coupling line sections, a first capacitor having an end connected to the connection point between the inductor and the second coupling line section, a resistor connecting the other end of the first capacitor to the ground, and a second capacitor connecting the connection point between the inductor and the first coupling line section to the ground.
Owner:TDK CORPARATION
Differential communication link with skew compensation circuit
ActiveUS8108710B2Minimize skewReduce signal reflectionPulse automatic controlError detection/correctionTelecommunications linkDifferential signaling
A system and method is presented for reducing skew between the positive and negative components of a differential signal in a high speed communications link. The communications link includes a signal generator producing and transmitting complementary positive and negative signals over separate transmission lines and a receiver receiving the complementary signals. The communication link further includes a skew compensation circuit having a skew detector, a controller, and separate delay and buffer elements for both the positive and negative component of the differential signal. The controller separately controls each of the delay or buffer elements in response to the detected skew between differential signal components.
Owner:MAYO FOUND FOR MEDICAL EDUCATION & RES
Adjustable antenna feed network with integrated phase shifter
InactiveUS7026889B2Reduce reflectionReduce signal reflectionAntenna supports/mountingsAntenna equipments with additional functionsPhase relationshipEngineering
A device for feeding signals between a common line and two or more ports. The device including a branched network of feedlines coupling the common line with the ports. The feedlines have transformer portions of varying width for reducing reflection of signals passing through the network. A dielectric member is mounted adjacent to the network and can be moved to synchronously adjust the phase relationship between the common line and one or more of the ports. The dielectric member also has transformer portions for reducing reflection of signals passing through the network. At least one of the junctions of the network does not overlap with the dielectric member, or overlaps a region of reduced permittivity.
Owner:COMMSCOPE TECH LLC
Radar level gauge system with single propagation mode feed-through
ActiveUS20180010949A1Reduce riskReduce signalingWaveguide hornsTransmission systemsTransceiverElectrical conductor
A radar level gauge system, comprising a transceiver; an antenna; a feed-through connecting the transceiver and the antenna; and processing circuitry coupled to the transceiver. The feed-through comprises a first waveguide section comprising a dielectric plug sealingly arranged in a cylindrical first hollow conductor section having a diameter selected for single mode propagation; a second waveguide section arranged between the transceiver and the first waveguide section and comprising a cylindrical second hollow conductor section having a second diameter selected for single mode propagation, a third waveguide section arranged between the antenna and the first waveguide section comprising a cylindrical third hollow conductor section having a third diameter selected for single mode propagation; a first impedance matching waveguide section arranged between the first waveguide section and the second waveguide section, and a second impedance matching waveguide section arranged between the first waveguide section and the third waveguide section.
Owner:ROSEMOUNT TANK RADAR
Slip ring device
InactiveUS20120115335A1High speed transmissionLess susceptible to noiseRotary current collectorCoupling device detailsElectricityRing device
A slip ring device includes a hollow pipe-shaped shaft rotatably supported inside a tubular body of a main case through a bearing and an electricity-collecting body integrally and concentrically provided in the shaft. The electricity-collecting body preferably includes a plurality of electricity-collecting rings and a plurality of insulating rings alternately layered with one another. The slip ring device further includes a plurality of brushes held by the main case and tip end portions making sliding contact with outer circumferential surfaces of the electricity-collecting rings and a plurality of lead lines introduced into the shaft. The lead lines include tip end portions electrically connected to the respective electricity-collecting rings. Two or more of the lead lines include shielded lines.
Owner:NIDEC SERVO CORP
Method and device for pseudo-differential transmission
InactiveUS20100253446A1Reduce signal reflectionReduce resonanceMultiple-port networksCross-talk/noise/interference reductionElectrical conductorDifferential transmission
The invention relates to a method and a device for pseudo-differential transmission in interconnections used for sending a plurality of electrical signals. The ends of an interconnection having 4 transmission conductors and a return conductor distinct from the reference conductor are each connected to a termination circuit. Three damping circuits are connected between the return conductor and the reference conductor. The transmitting circuits receive at their inputs the signals from the 4 channels of the two sources, and are connected to the conductors of the interconnection. The receiving circuits are connected to the conductors of the interconnection, each receiving circuit being such that the 4 channels of a source connected to a transmitting circuit in the activated state are sent to the four channels of the destinations without noticeable external crosstalk.
Owner:ZXNOISE LLC
Printed circuit board
ActiveUS20130327565A1Small sizeImprove transmission qualityPrinted circuit aspectsHigh frequency circuit adaptationsEngineeringPrinted circuit board
A printed circuit board includes: an insulating substrate, and a patterned conductive layer having a signal line and fixed on the insulating substrate, where signal lines on different planes of the patterned conductive layer are electrically connected to a via hole through a pad. An inner wall of the via hole is formed of a conductive bar and an insulating bar that penetrate the via hole; the pad is at an edge of the via hole and is connected to the conductive bar; the pad has an unclosed structure. In the printed circuit board according to the present invention, the size of the pad is significantly reduced by arranging the pad at partial edge of the via hole, thereby effectively improving a layout density of the patterned conductive layer, hence reducing the size of the printed circuit board, and satisfying the market demand for smaller electronic products.
Owner:CELESTICA TECH CONSULTANCY SHANGHAI
Slip ring device
InactiveUS8376757B2Less susceptible to noiseReduce amountRotary current collectorCoupling device detailsElectricityRing device
A slip ring device includes a hollow pipe-shaped shaft rotatably supported inside a tubular body of a main case through a bearing and an electricity-collecting body integrally and concentrically provided in the shaft. The electricity-collecting body preferably includes a plurality of electricity-collecting rings and a plurality of insulating rings alternately layered with one another. The slip ring device further includes a plurality of brushes held by the main case and tip end portions making sliding contact with outer circumferential surfaces of the electricity-collecting rings and a plurality of lead lines introduced into the shaft. The lead lines include tip end portions electrically connected to the respective electricity-collecting rings. Two or more of the lead lines include shielded lines.
Owner:NIDEC SERVO CORP
Circuit substrate
InactiveUS20110199165A1Preserve layout spaceCharacteristic impedance can be keptMultiple-port networksPrinted circuit aspectsEngineeringGround line
A circuit substrate includes a first pair of ground lines, a second pair of ground lines, a plurality of first connection lines, a plurality of second connection lines and a plurality of conductive pillars. The first and second pairs of ground lines are located on first and second surfaces of the substrate, respecteively. The pillars are located in the substrate and vertically conducted between the first pair of ground lines and the second connection lines and between the second pair of ground lines and the first connection lines, and the first and second pairs of ground lines are conducted, so that a 3-D grounding circuit loop is formed. Moreover, a first pair of signal lines is disposed between the first connection lines for grounding and a second pair of signal lines is disposed between the second connection lines for grounding to get a better signal integrity.
Owner:SUNPLUS TECH CO LTD
1:N MEM switch module
ActiveUS20050068129A1Low insertion lossHigh frequencyElectrostatic/electro-adhesion relaysWaveguide type devicesCapacitancePhase shifted
A 1:N MEM switch module comprises N MEM switches fabricated on a common substrate, each of which has input and output contacts and a movable contact which bridges the input and output contacts when the switch is actuated. The input contacts are connected to a common input node, and the output contacts are connected to respective output lines. Each output line has an associated inductance and effective capacitance, and is arranged such that its inductance is matched to its effective capacitance. The switches are preferably arranged symmetrically about the terminus point of the signal input line. A phase shifter employs at least two switch modules connected together with N transmission lines having different lengths, operated such that an input signal is routed via one of the transmission lines to effect a desired phase-shift.
Owner:TELEDYNE SCI & IMAGING
Digital visual interface dual-stack connector
InactiveUS8684768B2Exact matchReduce signal reflectionCoupling device detailsPrinted circuitsDigital Visual InterfaceImpedance matching
Owner:WIESON TECH CO LTD
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