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| Number | Title | Issue Date |
| 7952450 | Manually adjustable attenuator An improved manually adjustable wave attenuator for a waveguide comprises a resistive portion sandwiched between two dielectric portions. In a preferred embodiment the adjustable attenuator comprises a first card further comprising a dielectric portion and a resisti... | 05/31/2011 |
| 7733195 | Waveguide attenuator having coaxial probes Various methods and devices are provided for attenuating RF signals propagating within a waveguide. In particular, a plurality of coaxial probes are incorporated into the waveguide for the purpose of attenuating X-band RF signals. In one embodiment, a 7-bit, 3 dB li... | 06/08/2010 |
| 7351990 | Analyzer magnet chamber liner A waveguide liner for an analyzer magnet chamber having three interlocking pieces of graphite, the liner pieces having sufficient size to allow them to stand freely without being secured, said liner pieces providing case of interchange and replacement in a Kestrel a... | 04/01/2008 |
| 7304554 | U-shaped microwave and millimeter wave resonator filter A filter including a body on which a waveguide groove, whose one surface is open, is formed in a U-shape and a plurarity of inductive resonant windows are provided along a longitudinal direction of the waveguide groove at a predetermined interval in the waveguide gr... | 12/04/2007 |
| 7271683 | Electromagnetic switch element An electromagnetic switch element that through electromechanical actuation is able to be used to influence the propagation of an electromagnetic signal within a guiding medium. An electromagnetic switch element that is activated by displacement of conducting element... | 09/18/2007 |
| 7038556 | Waveguide type signal terminator and signal attenuator Disclosed are a waveguide type signal attenuator for attenuating an input signal as desired and a waveguide type signal terminator for making an input signal be utterly disappeared, where a manufacturing-easy resistor sheet is inserted into the center area, along wh... | 05/02/2006 |
| 7039942 | Pad adjustable equalizer for two way cable transmission A forward signal equalizer for a forward amplifier for two-way coaxial cable systems, of the type having a distribution center distributing forward signals, and having reception facilities for receiving return signals from said cable system, the system having forwar... | 05/02/2006 |
| 7002429 | Nonreflective waveguide terminator and waveguide circuit A nonreflective waveguide terminator includes a waveguide portion and an electromagnetic wave absorber. The portion has a rectangular opening in a plane perpendicular to a radio-wave propagation direction. The portion has one open end in the direction and the other ... | 02/21/2006 |
| 6985047 | Continuously tunable waveguide attenuator A continuously variable waveguide attenuator (100). The continuously variable waveguide attenuator includes at least one waveguide attenuator cavity (109) having at least one barrier. A fluid dielectric (108) having a loss tangent, a permittivit... | 01/10/2006 |
| 6975188 | Variable waveguide A variable waveguide system (100). The variable waveguide system (100) includes a waveguide (102), a dielectric structure (116) including at least one cavity disposed within the waveguide, and a conductive fluid (126). The cavity i... | 12/13/2005 |
| 6972728 | Horn antenna with dynamically variable geometry An electromagnetic horn antenna (100). The antenna can include a horn housing having a throat portion (102), a tapered portion (106, 104) and an aperture 108. At least one cavity structure (142, 144, 138) can be provided within the... | 12/06/2005 |
| 6960965 | Transverse mode control in a waveguide A waveguide apparatus (100) includes a waveguide attenuator portion (102) having at least one waveguide cavity (109) and a conductive fluid (108) at least partially disposed within a waveguide cavity (104). At least one composition... | 11/01/2005 |
| 6952145 | Transverse mode control in a transmission line A waveguide apparatus (100) and method (300) of mode control can include a waveguide structure (102) defining at least one cavity (116) disposed within the waveguide apparatus. The waveguide apparatus has at least a first operational stat... | 10/04/2005 |
| 6952146 | Variable fluidic waveguide attenuator A waveguide attenuator apparatus (100) includes a variable waveguide attenuator (102) having at least one waveguide attenuator cavity (109) and a fluidic dielectric (108) having a loss tangent, a permittivity and a permeability at least p... | 10/04/2005 |
| 6937110 | Variable cut off attenuator for rectangular wave-guides The attenuator includes two variable-section components (13, 15) for the passage, in conditions of perfect adaptation, from a first wave-guide in the P band to a second wave-guide in the X band and vice versa. An air-filled zone (5V), the length of which can ... | 08/30/2005 |
| 6870449 | High-frequency transmission line In a high-frequency transmission line that is used in a high-frequency band such as the microwave band or the millimeter wave band, at least one resistive film is disposed in a plane that is substantially perpendicular to an electric field of an operating transmissi... | 03/22/2005 |
| 6657514 | Dielectric transmission line attenuator, dielectric transmission line terminator, and wireless communication device A dielectric transmission line attenuator or terminator, which is used with a dielectric transmission line provided with two conductive plates substantially parallel to each other and a dielectric strip held between the two conductive plates. A resistor f... | 12/02/2003 |
| 6441698 | Dielectric-waveguide attenuator, dielectric-waveguide terminator, and wireless apparatus incorporating same A dielectric-waveguide attenuator, a dielectric-waveguide terminator, and a wireless apparatus incorporating the same in which the length of a dielectric waveguide is shortened in a direction in which an electromagnetic wave propagates to reduce the size ... | 08/27/2002 |
| 6094106 | Non-radiative dielectric waveguide module A module equipped with a non-radiative dielectric waveguide in accordance with this invention comprises a pair of parallel flat conductors arranged at a space of 1/2 or below of a high frequency signal wavelength λ and a dielectric strip extending betwee... | 07/25/2000 |
| 6066992 | Variable ISO attenuator using absorptive/reflective elements and latching A variable absorptive/reflective high power attenuator for attenuating microwave signals in a communication system is formed from a circulator connected to a section transmission line such as a waveguide, having at least one adjustable tuning element conn... | 05/23/2000 |
| 5969581 | Opto-electronically controlled RF waveguide An opto-electronically controlled waveguide includes a waveguide; a finline mounted in the waveguide; a photovoltaic switch operably electrically cected to the finline; and a light source for generating an optical signal for modulating the photovoltaic ... | 10/19/1999 |
| 5969609 | Counter-current RF field attenuator using loop tubes The attenuator is applicable to the art of identification, interrogation and communication equipment. The attenuator has particular application to equipment used in conjunction with smart cards, tags and like apparatus and including, in one form, an RF ba... | 10/19/1999 |
| 5949298 | High power water load for microwave and millimeter-wave radio frequency sources A high power water load for microwave and millimeter wave radio frequency sources has a front wall including an input port for the application of RF power, a cylindrical dissipation cavity lined with a dissipating material having a thickness which varies ... | 09/07/1999 |
| 5894197 | Device for attenuating unwanted waves in an electron tube The present invention relates to a device for attenuating unwanted waves appearing in an electron tube which includes at least two coaxial cylindrical electrodes (2, 3). The electrodes (2, 3) contribute to forming the walls of a coaxial resonator. The unw... | 04/13/1999 |
| 5801598 | High-power RF load A compact high-power RF load comprises a series of very low Q resonators, or chokes 16!, in a circular waveguide 10!. The sequence of chokes absorb the RF power gradually in a short distance while keeping the bandwidth relatively wide. A polarizer 1... | 09/01/1998 |
| 5796314 | Active high-power RF switch and pulse compression system A high-power RF switching device employs a semiconductor wafer positioned in the third port of a three-port RF device. A controllable source of directed energy, such as a suitable laser or electron beam, is aimed at the semiconductor material. When the so... | 08/18/1998 |
| 5786739 | Integrated evanescent mode filter with adjustable attenuator A waveguide evanescent mode filter is integrated with a monolithic microwave integrated circuit (MMIC) by forming both the MMIC circuitry and the waveguide filter on a single substrate that forms a common ground plane for both elements. The waveguide has ... | 07/28/1998 |
| 5742211 | Radio-frequency and microwave load comprising a carbon-bonded carbon fiber composite A billet of low-density carbon-bonded carbon fiber (CBCF) composite is machined into a desired attenuator or load element shape (usually tapering). The CBCF composite is used as a free-standing load element or, preferably, brazed to the copper, brass or a... | 04/21/1998 |
| 5610562 | Waveguide absorber A waveguide absorber which withstands high mechanical and thermal loads is typified in that a member (4) exhibiting absorber material is clamped between waveguide walls (5, 6) in such a way that at least one wall region (5) adjoining the member (4) is con... | 03/11/1997 |
| 5523727 | Dielectric waveguide including a tapered wave absorber A dielectric waveguide has a pair of parallel flat metallic plates spaced from each other, a dielectric strip sandwiched between the parallel flat metallic plates, and a wave absorber sandwiched between the parallel flat metallic plates and extending para... | 06/04/1996 |
| 5469128 | Circuit elements for microwave and millimeter-wave bands and method of producing same A circuit element for microwave and millimeter-wave bands and a method of producing the same. A dielectric line is made of a pure dielectric resin. A high-frequency wave absorbing member is made of a pure dielectric resin containing at least one of first,... | 11/21/1995 |
| 5262737 | Data processing system and housing having reduced electromagnetic emissions A data processing system and housing are disclosed having reduced electromagnetic energy emissions. A central processor is mounted within a generally rectangular conductive outer case which includes one or more apertures for receiving and mounting electro... | 11/16/1993 |
| 5175516 | Waveguide termination A liquid cooled adjustable waveguide termination for use in high power applications is described. The liquid cooled adjustable termination includes a waveguide housing having a shorting plate disposed at an end portion of the housing and an electromagneti... | 12/29/1992 |
| 5159295 | Microwave vector modulator and device for matching a microwave load A microwave vector modulator (4) of the reflective type is used to match a microwave load. The adjustable reflection of the vector modulator is obtained by semiconducting surfaces (18, 19, 20, 21), illuminated by light-emitting means (24, 25, 26, 27).... | 10/27/1992 |
| 5113160 | Wide band cryogenic ultra-high vacuum microwave absorber An absorber wave guide assembly for absorbing higher order modes of microwave energy under cryogenic ultra-high vacuum conditions, that absorbs wide-band multi-mode energy. The absorber is of a special triangular shape, made from flat tiles of silicon car... | 05/12/1992 |
| 5099214 | Optically activated waveguide type phase shifter and attenuator A waveguide having walls defining an opening. An optically transmissive aperture in one wall allows light from an optical illumination source such as a laser diode array to illuminate the opening in which is located a semiconductor slab positioned to be i... | 03/24/1992 |
| 5030793 | Integrated EMI filter and thermal heat sink The present invention discloses an apparatus that shields electronic equipment from electromagnetic interference. The apparatus is a partially enclosed box having a substantially enclosed cavity. Disposed within the cavity is electronic equipment that is ... | 07/09/1991 |
| 4973963 | Flat lattice for absorbing electromagnetic wave A plurality of waveguide elements are arranged to form an electromagnetic wave absorbing lattice in opposed relation to the advancing wave surface of the incident electromagnetic wave. Each waveguide element has a front opening on the lattice receptive of... | 11/27/1990 |
| 4960487 | Process for making microwave energy attenuating circuits A process for making attenuating circuits from a waveguide, in which the guide is made from two metal parts (A, B) of elongated shape, at least one of which comprises a groove (1) over the entire length of the part or parts, the two parts (A, B) being int... | 10/02/1990 |
| 4918410 | Isolator for microwave electromagnetic radiation An insert for non-reciprocal waveguide device comprises a layer of ferrite and a layer of energy absorbing material with a spacer layer between them. The device works by reason of asymmetrical interaction of the microwave energy and the ferrite whereby en... | 04/17/1990 |
