Patent application number | Description | Published |
20090243761 | Circular Polarizer for Coaxial Waveguide - There is disclosed a linear polarization to circular polarization converter. An outside surface of an inner conductor may be coaxial with the inside surface of an outer conductor. First and second diametrically opposed conductive fins may extend outward from the outer surface of the inner conductor. First and second dielectric fins may be interlocked with the first and second conductive fins, respectively. | 10-01-2009 |
20090251233 | Ortho-Mode Transducer for Coaxial Waveguide - There is disclosed an ortho-mode transducer. An annular common waveguide may be defined by an outside surface of an inner conductor and an inside surface of an outer conductor, the outside surface and the inside surface concentric about a waveguide axis. A first port may couple a first TE | 10-08-2009 |
20090284327 | Rotatable Polarizer Device and Feed Network Using The Same - There is disclosed a feed network including a circular common waveguide having an axis and terminating in a common port and a first port for coupling a first linearly polarized mode to the circular common waveguide. A phase shifting element may be disposed within the circular waveguide. The phase shifting element may be adapted to cause a predetermined phase shift between a first signal and a second signal propagating in the common waveguide. The phase shifting element may be rotatable about the axis of the common waveguide. | 11-19-2009 |
20100109814 | Circular Polarizer Using Interlocked Conductive and Dielectric Fins in an Annular Waveguide - There is disclosed a linear polarization to circular polarization converter. An outside surface of an inner conductor may be coaxial with the inside surface of an outer conductor. First and second diametrically opposed fins may extend outward from the outer surface of the inner conductor. Each of the first and second fins may include a conductive fin and a dielectric fin. | 05-06-2010 |
20110037534 | Ortho-Mode Transducer With TEM Probe for Coaxial Waveguide - An ortho-mode transducer may include an annular common waveguide defined by an outside surface of an inner conductor and an inside surface of an outer conductor, the outside surface and the inside surface concentric about a waveguide axis. A first port may couple a first TE | 02-17-2011 |
20120229232 | Rotatable Polarizer/Filter Device and Feed Network Using the Same - A feed network may include a cylindrical common waveguide terminating in a common port and an orthomode transducer having a first port for coupling a first linearly polarized mode to the cylindrical common waveguide and a second port for coupling a second linearly polarized mode to the cylindrical common waveguide, the second linearly polarized mode orthogonal to the first linearly polarized mode. A filter-polarizer element may be disposed within the cylindrical common waveguide. The filter-polarizer element may be rotatable about an axis of the cylindrical common waveguide. The filter-polarizer element may be configured to cause a predetermined relative phase shift between a first signal and a second signal propagating in the cylindrical common waveguide. The filter-polarizer element may be further configured to suppress propagation of at least one undesired mode in the cylindrical common waveguide. | 09-13-2012 |
20120306592 | Opposed Port Ortho-Mode Transducer With Ridged Branch Waveguide - An ortho-mode transducer may include a common waveguide terminating in a common port. A horizontal branch waveguide may terminate in a horizontal port. The horizontal branch waveguide may couple a first linearly polarized mode from the horizontal port to the common waveguide. The horizontal branch waveguide may comprise one or more ridged waveguide segments. A vertical branch waveguide may terminate in a vertical port opposed to the horizontal port. The vertical branch waveguide may couple a second linearly polarized mode from the vertical port to the common waveguide, the second linearly polarized mode orthogonal to the first linearly polarized mode. | 12-06-2012 |
20120319804 | Circular Polarizer Using Stepped Conductive and Dielectric Fins In An Annular Waveguide - A polarization converter may include an annular waveguide comprising an inner conductor having an outer surface and an outer conductor having an inner surface coaxial with the outer surface of the inner conductor. A plurality of loading structures may be disposed within the annular waveguide to form a plurality of regions within the annular waveguide including an alternating sequence of high phase shift regions and low phase shift regions along a direction of propagation of an electromagnetic wave. The plurality of loading structures may be configured to introduce a predetermined relative phase shift between orthogonally polarized first and second components of the electromagnetic wave for a predetermined operating frequency band. The plurality of loading structures may be further configured to suppress propagation of one or more higher order modes in the annular waveguide over the operating frequency band. | 12-20-2012 |
20130278352 | ORTHO-MODE TRANSDUCER WITH WIDE BANDWIDTH BRANCH PORT - An ortho-mode transducer may include a cylindrical common waveguide terminating in a common port, a rectangular vertical branch waveguide in-line with the cylindrical common waveguide and terminating in a vertical port, and a rectangular horizontal branch waveguide normal to the common waveguide and terminating in a horizontal port. The vertical branch waveguide may be configured to couple a first linearly polarized mode from the vertical port to the common waveguide. The horizontal branch waveguide may be configured to couple a second linearly polarized mode, orthogonal to the first linearly polarized mode, from the horizontal port to the common waveguide. A portion of the vertical branch waveguide may overlap a portion of the cylindrical common waveguide. A septum may span the vertical branch waveguide proximate to the overlapping portions of the vertical branch waveguide and the common waveguide. A rectangular symmetry cavity may be opposed to the horizontal branch waveguide. | 10-24-2013 |
Patent application number | Description | Published |
20090309686 | LOW PROFILE COIL-WOUND BOBBIN - A low profile coil-wound bobbin is disclosed. A low profile coil-wound bobbin includes a spool and a terminal. The spool is configured to have a coil-wire arrangement wound around the spool. The terminals are to be coupled to the coil-wire arrangement and a first side of a circuit board. The terminal is configured to mechanically and/or electrically couple the low profile coil-wound bobbin to the first side of the circuit board such that the low profile bobbin extends through the circuit board to another side of the circuit board. | 12-17-2009 |
20100109832 | METHOD AND APPARATUS FOR ADJUSTING DISPLACEMENT CURRENT IN AN ENERGY TRANSFER ELEMENT - A method includes calculating a number of turns of a shield winding included in an energy transfer element of a power supply, where the calculating is to have a low noise current in an input conductor of the power supply. The method further includes: increasing the number of turns for the shield winding; operating the power supply; and adjusting a value of a shield impedance to substantially reduce the noise current. An apparatus includes a power supply having an energy transfer element and a shield impedance. The energy transfer element includes a shield winding having an end terminated externally to the energy transfer element. The shield impedance is coupled between the externally terminated end of the shield winding and an input conductor of the power supply, where the shield impedance has a non-zero finite impedance value to substantially reduce a noise current in the input conductor. | 05-06-2010 |
20120119865 | LOW PROFILE COIL-WOUND BOBBIN - A low profile coil-wound bobbin includes a spool, a terminal, a lower flange, and a terminal base member. The spool is configured to have a coil-wire arrangement wound around an axis the spool. The terminal is to be coupled to the coil-wire arrangement and a first side of a circuit board such that the axis of the spool is substantially normal to the circuit board and the bobbin extends completely through the circuit board. The lower flange is coupled to the spool to at least partially contain the coil-wire arrangement. The terminal base member is coupled to the lower flange and the terminal. A vertical member of the terminal base member includes a chamfer region on a top edge of the vertical member to guide and reduce stress on a wire end of the coil-wire arrangement. | 05-17-2012 |
20120151749 | METHOD AND APPARATUS FOR ADJUSTING DISPLACEMENT CURRENT IN AN ENERGY TRANSFER ELEMENT - Example methods include calculating a first number of turns of a shield winding included in an energy transfer element of a power supply. A first number of turns of the shield winding is calculated for the power supply to have a low noise current in an input conductor of the power supply. The method then includes increasing the first number of turns to a second number of turns. The power supply is then operated, which generates a first voltage waveform of a voltage between the input conductor and an output conductor of the power supply. An impedance is then inserted between the shield winding and the input conductor. The noise current is reduced by adjusting a value of the impedance until a second voltage waveform of the voltage between the input conductor and the output conductor reverses polarity to be the opposite of a polarity of the first voltage waveform. | 06-21-2012 |
20140333228 | DIMMER DETECTOR FOR BLEEDER CIRCUIT ACTIVATION - A circuit to be utilized for an LED driver bleeder activation. The circuit comprises a circuit block for timing a duration of any removed portion of a rectified line signal. The input of the circuit to be coupled to receive the phase controlled rectified line signal through a voltage divider. Comparing the divided rectified line signal with a threshold voltage and output a comparison result. A timer coupled to the comparator and responsive to the comparison result to time the duration of the removed portion of the rectified line signal and activate the bleeder activation circuitry to turn on the switching element of the bleeder to sink a controlled current from the input line. | 11-13-2014 |
Patent application number | Description | Published |
20140185337 | TRANSVERSE SHIELD WIRE FOR ENERGY TRANSFER ELEMENT - Energy transfer elements having a shield to reduce EMI while maintaining a low profile are disclosed. In one example, the transformer may include a transverse shield wire that may be utilized to keep displacement current within the energy transfer element. While windings of the energy transfer element are generally wound axially around the axis of a bobbin in a direction generally perpendicular to the axis of the bobbin, the transverse shield wire may be placed on the bobbin extending over multiple power windings of the energy transfer element in a transverse direction. The transverse shield wire may be situated outside all other windings wound around the bobbin. In some examples, one end of the transverse shield wire may be coupled to a switching node of the energy transfer element while the other end of the transverse shield wire may be coupled to a winding of the energy transfer element. | 07-03-2014 |
20140192569 | OVERVOLTAGE PROTECTION CIRCUIT - Apparatus and methods for generating an overvoltage signal from a bias winding signal of a power converter transformer are disclosed. In one example, an overvoltage protection circuit may include a current augmentation circuit and a detection circuit. The current augmentation circuit may be coupled to receive the bias winding signal, which may be representative of the power converter output. The current augmentation circuit may include a threshold circuit and a filter circuit that may generate a filtered level shifted signal from the bias winding signal. The current augmentation circuit may generate an augmented signal from the filtered level shifted signal. The detection circuit may be coupled to receive the augmented signal and to generate an overvoltage signal by comparing the augmented signal with a reference voltage. When high asserted, the overvoltage signal may indicate a potential overvoltage condition at the output of the power converter. | 07-10-2014 |
20140265898 | LOSSLESS PRELOAD FOR LED DRIVER WITH EXTENDED DIMMING - A quasi-phase active preload circuit to be coupled at the output of a non-isolated LED driver converter having a pre-stage phase-angle control dimmer circuit, such as a commonly used leading-edge control Triac dimmer, is disclosed. The quasi-phase active preload circuit may include a preload resistor coupled to a current-controlled current source configured to draw a sinking current through the preload resistor based on a peak detect signal. The peak detect signal may be, in one example, representative of a leading-edge peak voltage of an output of the Triac dimmer circuit, which may be representative of a conduction angle of the Triac dimmer circuit. During normal operating conditions, no sinking current is drawn through the preload resistor. During low dimming conditions, a sinking current that is responsive to the peak detect signal is drawn through the preload resistor. During deep dimming or when used with a leaky Triac dimmer, a maximum sinking current may be drawn through the preload resistor by the current-controlled current source. | 09-18-2014 |
Patent application number | Description | Published |
20100306258 | LIGHTWEIGHT DIRECTORY ACCESS PROTOCOL CLIENT - A method, apparatus and computer program product for updating data for an application, including invoking a client application; identifying an application having data to be updated; and sending a query to a directory server via the client application, the query identifying the data. | 12-02-2010 |
20110296443 | METHOD, SYSTEM AND COMPUTER PROGRAM PRODUCT FOR A LIGHTWEIGHT DIRECTORY ACCESS PROTOCOL CLIENT APPLICATION PROGRAM INTERFACE - A device, including a computer readable medium storing executable computer instructions for implementing an application program interface (API). The API including a function call for enabling communications between a calling application and a client on the device, the client communicating with a directory server. In another aspect, there is provided a computer-readable medium, including executable computer instructions for implementing an application program interface (API) on a device. The API, including a function call for enabling communications between a calling application and a client on the device, the client communicating with a directory server. | 12-01-2011 |
20120117153 | METHOD AND SYSTEM FOR PROVIDING CONFERENCING SERVICES - An approach is provided for supporting multi-media conferencing. Textual information (e.g., text associated with a presentation) is received for display during a conference session to multiple participants. For a particular participant, configuration information corresponding to the participant specifies language assistance for the textual information. Language assistance involves augmenting the textual information according to the configuration information for comprehension of the textual information by the particular participant. In one embodiment, the augmented textual information includes language translation of the textual information. Additionally, the augmented textual information can encompass definitions of terms, including acronyms. The augmented textual information is forwarded for display to the participant during the conference session. | 05-10-2012 |
20130024549 | METHOD, SYSTEM AND COMPUTER PROGRAM PRODUCT FOR LIGHTWEIGHT DIRECTORY ACCESS PROTOCOL APPLICATIONS - A device and computer-readable medium, including an application for communicating with a directory server. The application submits a query to the directory server requesting data for the application. In response to a query result that includes the requested data from the directory server, the application stores the received data for display on the device. In another aspect, there is provided a device, including a client process for running on the device and for communicating with a directory server; and an application for running on the device. The client process submits a query to the directory server requesting data for the application. In response to a query result that includes the requested data from the directory server, the client process stores the received data for display on the device by the application. | 01-24-2013 |