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...that Kleenex tissue was originally designed to be a gas mask filter? It was developed at the beginning of World War I to replace cotton, which was then in short supply as a surgical dressing.
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| Number | Title | Issue Date |
| 8115565 | Dual polarized waveguide feed arrangement with symmetrically tapered structures A waveguide arrangement having a longitudinal extension, along which an electromagnetic wave may propagate, and comprising at least one waveguide part and a feeding arrangement which is arranged for feeding said waveguide part with a first polarization and a second ... | 02/14/2012 |
| 8008984 | 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 ... | 08/30/2011 |
| 8008983 | Waveguide multiplexer and waveguide phase shifter connected by a polarization adjustment assembly An adjustable assembly apparatus includes a waveguide phase shifter and a waveguide multiplexer. The waveguide phase shifter has a first flange structure and the waveguide multiplexer has a second flange structure. The second flange structure and the first flange st... | 08/30/2011 |
| 7978020 | Waveguide junction having angular and linear offsets for providing polarization rotation A junction (300) for connecting two waveguides having an angular offset between longitudinal symmetry axes of their cross-sections and a first linear offset of the center axes of the waveguides. The junction (300) comprises at least a first and a secon... | 07/12/2011 |
| 7956700 | Waveguide junction A junction (100) for connecting two waveguides (102, 104) having a first angular offset (α) between longitudinal symmetry axes of their cross-sections, said junction (100) comprising a first interface and a second interlace for connecting said ... | 06/07/2011 |
| 7847652 | Compact orthomode transducer with improved cross-polarization isolation An orthomode transducer includes first, second and third waveguide sections. The first waveguide section is coupled to an antenna port and extends to a first port. The first waveguide section is configured to support the propagation of a signal having a first polari... | 12/07/2010 |
| 7808337 | T-shape waveguide twist-transformer A junction for connecting two waveguides having substantially a 90-degree angular offset between longitudinal symmetry axes of their cross-sections. The junction has a first interface and a second interface for connecting the waveguides, and at least a first transfo... | 10/05/2010 |
| 7772940 | Rotatable polarizer device using a hollow dielectric tube 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 th... | 08/10/2010 |
| 7772939 | Polarization transformation circuit An apparatus adapted for easily performing polarization switching is disclosed. Within a second waveguide connected to a first waveguide, there is embedded a polarization transformation circuit in the state rotated relative to the second waveguide at an angle set, b... | 08/10/2010 |
| 7768362 | Comb polarizer suitable for millimeter band applications There is provided a comb polarizer suitable for millimeter band applications including: a waveguide having an aperture side formed of two separable half waveguides, and a comb shaped conductive unit having a plurality of cogs interposed between two half waveguides f... | 08/03/2010 |
| 7755446 | Waveguide and method for adjusting waveguide structure thereof A waveguide comprises a connecting part, a main chamber and a buffer. The connecting part is connected to the main chamber via the buffer. The side length of the junction between the connecting part and the buffer is smaller than that of the junction between the buf... | 07/13/2010 |
| 7746190 | Polarization-preserving waveguide filter and transformer A microwave waveguide filter includes an input waveguide section, an output waveguide section, a plurality of resonator sections disposed between the input and output waveguide sections, and a plurality of coupling sections disposed on either side of each of the res... | 06/29/2010 |
| 7656246 | Circular polarizer using conductive and dielectric fins in a 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 out... | 02/02/2010 |
| 7501909 | Wide-bandwidth polarization modulator for microwave and mm-wavelengths A polarization modulator device for modulating a polarization of an electromagnetic wave includes a corrugated metallic waveguide having an interior cylindrical opening defined therein and situated along a longitudinal axis of the waveguide. The corrugated metallic ... | 03/10/2009 |
| 7439925 | Dual band corrugated feed horn antenna A dual band antenna with a corrugated feed horn comprises a waveguide and a feed horn assembly. The feed horn assembly comprises at least two portions. Two portions each have at least a cylindrical ring and a groove, in which the groove is between two cylindrical ri... | 10/21/2008 |
| 7414491 | Method and apparatus for changing the polarization of a signal A method and apparatus for changing the polarization of an input signal includes propagating a polarized input signal having orthogonal E-field components by at least one surface each having a respective surface impedance and varying at least one of the surface impe... | 08/19/2008 |
| 7408427 | Compact multi-frequency feed with/without tracking A method and apparatus forming an efficient and compact waveguide feed with all components for processing signals in multi-frequency band antenna feeds with single/dual linear/circular polarizations with/without tracking. The layout can be realized in a split block ... | 08/05/2008 |
| 7397323 | Orthomode transducer A waveguide orthomode transducer. In a first layer a turnstile junction having a main waveguide and four waveguide ports, and four hybrid tees each have an e-port, two opposed side-ports, and an h-port. The hybrid tees are ring-arranged around the turnstile junction... | 07/08/2008 |
| 7394335 | Polarized high-order mode electromagnetic wave coupler and its coupling method The a polarized high-order mode electromagnetic wave converter and its coupling method, uses bifurcate structure to divide the input wave into two signals with the same amplitude but opposition phases, which are then inputted into a circular main waveguide through w... | 07/01/2008 |
| 7378914 | Solid-state high-power oscillators Embodiments of High-Power Millimeter-Wave Oscillators are generally described herein. Other embodiments may be described and claimed. In some embodiments, the oscillator includes a polarized partial reflector to at least partially reflect back signals to a reflectio... | 05/27/2008 |
| 7304552 | Waveguide for use in dual polarisation probe system having a signal reflector and rotator provide differential phase shift A waveguide for use with a dual polarization waveguide probe system is described which provides an improved frequency response across a desired frequency range (10.7 to 12.75 GHz) and particularly at the band edges. This is achieved by providing a waveguide with a r... | 12/04/2007 |
| 7280080 | Multiple beam feed assembly A multi-beam feed assembly having a feed assembly housing with a plurality of input waveguide(s) formed in a front face. The housing may be adapted for manufacture via die casting. The housing also having at least two PCB mounting surface(s), a plurality of probe ap... | 10/09/2007 |
| 7276990 | Single-pole multi-throw switch having low parasitic reactance, and an antenna incorporating the same A switch arrangement comprises a plurality of MEMS switches arranged on a substrate about, and close to, a central point, each MEMS switch being disposed on a common imaginary circle centered on the central point. Additionally, and each MEMS switch is preferably spa... | 10/02/2007 |
| 7259640 | Miniature RF and microwave components and methods for fabricating such components RF and microwave radiation directing or controlling components are provided that may be monolithic, that may be formed from a plurality of electrodeposition operations and/or from a plurality of deposited layers of material, that may include switches, inductors, ant... | 08/21/2007 |
| 7253699 | RF MEMS switch with integrated impedance matching structure An impedance matching structure for a RF MEMS switch having at least one closeable RF contact in an RF line, the impedance matching structure comprising a protuberance in the RF line immediately adjacent the RF contact that forms one element of a capacitor, the othe... | 08/07/2007 |
| 7245269 | Adaptive beam forming antenna system using a tunable impedance surface A method of and apparatus for beam steering. A feed horn is arranged so that the feed horn illuminates a tunable impedance surface comprising a plurality of individually tunable resonator cells, each resonator element having a reactance tunable by a tuning element a... | 07/17/2007 |
| 7239285 | Circular polarity elliptical horn antenna A relatively low cost, easy to install and aesthetically pleasing digital video broadcast from satellite (DVBS) elliptical horn antenna designed as part of a reflector antenna system to receive satellite television broadcast signals with circular polarity. This type... | 07/03/2007 |
| 7239219 | Miniature RF and microwave components and methods for fabricating such components RF and microwave radiation directing or controlling components are provided that may be monolithic, that may be formed from a plurality of electrodeposition operations and/or from a plurality of deposited layers of material, that may include switches, inductors, ant... | 07/03/2007 |
| 7236681 | Feed assembly for multi-beam antenna with non-circular reflector, and such an assembly that is field-switchable between linear and circular polarization modes A feed assembly for an antenna having a non-circular reflector, in which the feed assembly includes a feed horn capable of correcting the distortions of circularly polarized signals caused by the non-circular reflector profile, and wherein the feed horn is coupled w... | 06/26/2007 |
| 7218441 | Non-polarization light source device and raman amplifier A laser light source outputs a virtually linearly-polarized light beam that has plural mode components arranged at an interval of an almost equal angular frequency. A polarization dispersion device is connected to the laser light source in such a way that a polariza... | 05/15/2007 |
| 7215222 | Dual polarization waveguide probe system with wedge shape polarization rotator There is disclosed herein a waveguide rotator for use with a dual polarization waveguide probe system. The waveguide has an internal structure that protrudes into the waveguide such that a first orthogonal component of the incident polarized signal propagates to the... | 05/08/2007 |
| 7212087 | Twisted waveguide and wireless device H plane and E plane of a second rectangular waveguide element are inclined at an angle of 45° with respect to H plane and E plane of a first rectangular waveguide element. A connection element disposed between the first and second rectangular waveguide elements has... | 05/01/2007 |
| 7170366 | Waveguide to microstrip transition with a 90° bend probe for use in a circularly polarized feed A first waveguide to microstrip transition, the waveguide having a top, a bottom, a first sidewall, a second sidewall and a closed end. A transition slot normal to a longitudinal axis of the waveguide intersects the top and the first sidewall. A probe having a 90 de... | 01/30/2007 |
| 7170460 | Polarized wave separator, converter for satellite broadcast reception, and antenna device for satellite broadcast reception A polarized wave separator includes a tubular waveguide, and a partition extending in the waveguide along the longitudinal direction thereof. The end of the partition facing the longitudinal direction is a step-graded end taking a stepped configuration when viewed f... | 01/30/2007 |
| 7164387 | Compact tunable antenna The present disclosure relates to a method and an antenna for transmitting/receiving a RF signal at a plurality of different frequencies. Transmitting/receiving a RF signal at a plurality of different frequencies is achieved by providing a F antenna comprising a plu... | 01/16/2007 |
| 7154451 | Large aperture rectenna based on planar lens structures A rectenna structure comprising a flexible, dielectric sheet of material; a plurality of metallic lenslets disposed on the sheet of material; and a plurality of diodes disposed on the sheet of material, each diode in said plurality of diodes being arranged at a focu... | 12/26/2006 |
| 7151494 | Reflective and transmissive mode monolithic millimeter wave array system and oscillator using same An oscillator. In the illustrative embodiment, the oscillator includes an ortho-mode feed; a reflective amplifier array adapted to be illuminated by the feed with an input wavefront with a first polarization and to return thereto an amplified wavefront with a second... | 12/19/2006 |
| 7146084 | Fiber optic light source for display devices A light source includes at least one optical fiber having a length and first and second ends and at least one electromagnetic wave source disposed along at least a portion of the length of the fiber for transmitting electromagnetic waves through a side surface of th... | 12/05/2006 |
| 7132907 | Frequency-separator waveguide module with double circular polarization The module comprises an input/output access point at a first end of a waveguide with a square cross section, called a square waveguide, two access points made of waveguides with a rectangular cross section, called rectangular waveguides, placed side by side at a sec... | 11/07/2006 |
| 7126530 | Non-coherent high-power directed-energy system and method A directed-energy system includes a plurality of non-coherent microwave sources and a plurality of antennas. Each antenna may be coupled to a corresponding one or more of the sources to radiate energy from the sources and cumulatively generate high-energy pulses bas... | 10/24/2006 |
