Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7907030 | Integrated circulators sharing a continuous circuit The present invention is directed to a circuit assembly that includes an integrated circulator assembly. The circuit assembly has a first substrate, which contains a continuous circuit trace that includes a circulator component from the circulator assembly and at le... | 03/15/2011 |
| 7876280 | Frequency control of electrical length for bicone antennas A broadband bicone antenna supports frequency selective control of electrical length. Frequency selective control of the electrical length of an antenna can provide an antenna exhibiting two or more different electrical lengths where use of each length depends upon ... | 01/25/2011 |
| 7683731 | Ferrite waveguide circulator with thermally-conductive dielectric attachments The present invention improves the geometry of ferrite circulators in order to increase the average power handling by decreasing the temperature rise in the ferrite and associated adhesive bonds. Embodiments of the present invention utilize dielectric attachments on... | 03/23/2010 |
| 7656296 | Antenna for mobile wireless data collection system The present invention provides an antenna system for reading RFID tags and/or transmitting and receiving wireless network signals, including for example wireless local area network (WLAN) signals, in a material handling environment. A ruggedized antenna can be mount... | 02/02/2010 |
| 7639142 | Systems and methods for order-picking In one exemplary embodiment in accordance with the invention, an order-picking system includes a picking cart having a radio frequency (RF) antenna arranged above an object-stacking surface of the picking cart. The order-picking system further includes a radio frequ... | 12/29/2009 |
| 7616127 | Removable mount for mounting an electronic system component on a forklift A removable mount for mounting an electronic system component on a forklift includes, in one embodiment, a mounting plate having a major surface for mounting the electronic system component and an inverted J-shaped part located at a top portion of the mounting plate... | 11/10/2009 |
| 7592544 | Snag-free coiled cable assembly for a lift truck A cable assembly for a lift truck includes, in one exemplary embodiment, a transportation cable loosely housed in a self-retracting hose preformed to default to a coiled shape when no pressure is applied to elongate the self-retracting hose. The self-retracting hose... | 09/22/2009 |
| 7569951 | Systems and methods for driving a ferrite load A ferrite load driver system in accordance with the invention includes a clock generator configured to generate a digital clock signal. The system further includes a digital pulse generator configured to generate an enable pulse having a pulse width equal to a certa... | 08/04/2009 |
| 7561003 | Multi-junction waveguide circulator with overlapping quarter-wave transformers An improved multi-junction waveguide circulator overlaps two quarter-wave dielectric transformer sections so that the transitional sections occur concurrently in the same length of waveguide. Consequently, the two quarter-wavelength sections require a total length o... | 07/14/2009 |
| 7557714 | Pallet jack antenna for RFID system The present invention provides an antenna for reading RFID tags in a material handling environment. At least one ruggedized, upward-looking antenna is mounted on the fork (or other base-level platform) of a pallet jack or pallet truck. The antenna can be configured ... | 07/07/2009 |
| 7548166 | Tine-mounted antenna for an RFID The present invention provides a tine-mounted antenna for reading RFID tags in a warehouse environment using RFID technology operating at ultra-high frequencies (UHF) or microwave frequencies and backscatter coupling techniques. At least one ruggedized antenna is mo... | 06/16/2009 |
| 7538737 | High impedance bicone antenna A high impedance bicone antenna system supporting ultra wideband operation. The antenna may comprise a reduced aperture size and reduced half-angles of the conductive cones forming the antenna. Reduction in cone angles may increase the impedance of the cones. An imp... | 05/26/2009 |
| 7525501 | Bicone pattern shaping device A broadband omni-directional bicone antenna. The antenna can comprise conductive surfaces of conical voids provided within a solid dielectric structure. The outside surface of the solid structure can support a radio frequency (RF) lens geometry operable for beam for... | 04/28/2009 |
| 7501918 | System for connecting waveguides A connecting system can couple two waveguides to one another, wherein each of the waveguides comprises a flange or a protruding rim. When the waveguides are connected together, the flanges can face one another in an adjoining arrangement. The connecting system can c... | 03/10/2009 |
| 7471175 | Planar mixed-signal circuit board A mixed-signal circuit board can provide a flexible arrangement of multiple RF transmission mediums in a single lightweight and compact structure as well as support embedding electronic devices within RF transmission paths. The transmission mediums may include a voi... | 12/30/2008 |
| 7463193 | Beam forming system A compact system can use modular components to enhance the isolation or quality of signals that an antenna array produces. The system can comprise an array of input coupler modules and an array of output coupler modules respectively on the input and output sides of ... | 12/09/2008 |
| 7460017 | Pallet jack antenna for RFID system The present invention provides an antenna for reading RFID tags in a material handling environment. At least one ruggedized, upward-looking antenna is mounted on the fork (or other base-level platform) of a pallet jack or pallet truck. The antenna can be configured ... | 12/02/2008 |
| 7460016 | Radio frequency identification (RFID) system for a forklift In one of several embodiments, an RFID system for a forklift incorporates a metal plate to which is attached an electronic circuit assembly. Also attached to the metal plate, is an antenna assembly housing an RFID interrogator antenna and/or a wireless local area ne... | 12/02/2008 |
| 7449975 | Ultra wide bandwidth balun A balun is a device for coupling together balanced and unbalanced electrical signals. An ultra-wide bandwidth balun can operate in a frequency band of more than 1.5 GHz to 26.5 GHz. The balun can be based upon a resistively loaded choke structure. The loading can be... | 11/11/2008 |
| 7420434 | Circular to rectangular waveguide converter including a bend section and mode suppressor A compact circular waveguide system can connect circular waveguides through a bend while avoiding excessive interaction between the orthogonal modes of the circular waveguides. A compact bend system with circular waveguide input and output can be achieved by providi... | 09/02/2008 |
| 7301504 | Mechanical scanning feed assembly for a spherical lens antenna The invention includes a mechanical scanning feed and a spherical lens antenna system. The mechanical feed includes a waveguide, which has a movable wall assembly that contains a guide slot. The moveable wall portion also includes an end wall that is located proxima... | 11/27/2007 |
| 7280004 | Latching ferrite waveguide circulator without E-plane air gaps An apparatus, system, and method of and for a microwave circulator. The apparatus, system, and method includes a non-reciprocal element for coupling microwaves from an input port to at least one output port, wherein the non-reciprocal element is capable of isolating... | 10/09/2007 |
| 7242263 | Transformer-free waveguide circulator An improved waveguide circulator that eliminates the need for quarter-wave dielectric transformers or impedance steps in the interface waveguide for broadband operation is described. The circulator designs in the prior art all require impedance matching elements out... | 07/10/2007 |
| 7230507 | Compact waveguide isolator An improved waveguide isolator that eliminates the transitions to air-filled waveguides between ferrite elements and absorptive load elements is described. The waveguide isolator in accordance with the invention can be implemented in variations from a single ferrite... | 06/12/2007 |
| 7176767 | Multi-junction waveguide circulator with elements having no discontinuities An improved multi-junction waveguide circulator that eliminates the transitions to dielectric transformers and air-filled waveguides between ferrite elements is described. The waveguide circulator in accordance with the invention can be implemented in variations fro... | 02/13/2007 |
| 7170466 | Wiper-type phase shifter with cantilever shoe and dual-polarization antenna with commonly driven phase shifters A wiper-type phase shifter with a cantilever shoe that ensures that the electrical contact on the wiper arm remains in electrical communication with the transmission trace located on the antenna backplane without relying to an element, such as a spring-loaded set sc... | 01/30/2007 |
| 7109919 | Beamformer for multi-beam broadcast antenna A phased array antenna system operative to broadcast multiple beams that each include coded data for specific users located within the coverage area of the corresponding beam. An appropriate receiver then receives and decodes a particular beam to extract the specifi... | 09/19/2006 |
| 7049900 | Multi-junction waveguide circulator using a single control wire for multiple ferrite elements An improved multi-junction waveguide circulator that eliminates the transitions to dielectric transformers and air-filled waveguides between ferrite elements is described. The elimination of the additional transformer sections between the ferrite elements allows for... | 05/23/2006 |
| D514554 | Ceiling mounted communication access point | 02/07/2006 |
| 6982680 | Antenna tower and support structure therefor An antenna tower and support structure for use with an antenna tower, which allow a number of antennas or antenna panels to be mounted thereto, while maintaining the compactness of the overall structure and still providing high strength, such as is needed to resist ... | 01/03/2006 |
| 6965279 | Double-sided, edge-mounted stripline signal processing modules and modular network A class of modular, double-sided, edge-mounted printed circuit (PC) board modules and an associated modular network architecture for constructing stripline signal processing networks including high-power analog amplifiers and beam forming networks for driving multi-... | 11/15/2005 |
| 6950061 | Antenna array for moving vehicles A low-profile antenna system to be mounted to a moving vehicle for receiving signals, such as from a Digital Broadcast Satellite, includes a base for mounting to the surface of the vehicle, a platen mounted to the base for rotation, an azimuth drive motor for rotati... | 09/27/2005 |
| 6947008 | Conformable layered antenna array A low-cost antenna array and method of manufacturing the array, in a planar form or in a structurally flexible or curved array structure are shown. The antenna array has a plurality of metallic antenna electrical and radiator elements formed on a foam core layer bon... | 09/20/2005 |
| 6933905 | RF card with conductive strip One or more feedback elements generate a feedback signal in response to a transmitted signal outputted by each radiator of the antenna system. This feedback signal is received by each radiator, also described as a radiating element, and combined with any leakage sig... | 08/23/2005 |
| 6911939 | Patch and cavity for producing dual polarization states with controlled RF beamwidths An antenna system can generate RF radiation fields having dual simultaneous polarization states and having substantially rotationally symmetric radiation patterns. The antenna system generates RF radiation patterns where the beamwidths of respective RF fields for re... | 06/28/2005 |
| 6897809 | Aperture Coupled Cavity Backed Patch Antenna A compact antenna system can generate RF radiation fields having increased beamwidths and bandwidths. The antenna system can include one or more patch radiators. The lower patch radiators can be mounted to a printed circuit board that can include a ground plane whic... | 05/24/2005 |
| 6885257 | Multi-junction waveguide circulator without internal transitions An improved multi-junction waveguide circulator that eliminates the transitions to dielectric transformers and air-filled waveguides between ferrite elements is described. The waveguide circulator in accordance with the invention can be implemented in variations fro... | 04/26/2005 |
| 6836658 | High data rate satellite communications system and method A spot beam satellite communications system and method for delivering information to user terminals at a high data rate. In a hub, a high data rate serial data stream is separated into parallel data streams that are modulated onto respective uplink transponders. The... | 12/28/2004 |
| 6816124 | Linearly-polarized dual-band base-station antenna A dual-band antenna suitable for use in a cellular telephone network base station includes two parallel arrays of low-frequency dipole elements disposed on a ground plane, a raised array of high-frequency dipole elements disposed between the two parallel arrays, and... | 11/09/2004 |
| 6788165 | Variable power divider A variable power divider and method can vary the RF power between ports in a high power and multi-carrier RF environment, such as is used in controlling signals sent and received in a base station antenna. The variable power divider can include a single-control phas... | 09/07/2004 |
