Including Frequency Selective Absorbing Means Patents (Class 333/211)
  • Publication number: 20150061794
    Abstract: The present disclosure relates to a cavity filter, a connector and manufacturing processes thereof. The cavity filter comprises a cavity, a cover plate and a connector disposed on the cavity or the cover plate; an end of the connector is connected with internal devices inside the cavity filter and the other end of the connector is connected with external communication devices; and the connector comprises an inner conductor and a metal enclosure disposed coaxially and an insulation medium disposed between the metal enclosure and the inner conductor, and a non-metal layer is disposed on an outer peripheral surface of the metal enclosure. The connector of the present disclosure is formed with a non-metal layer on the outer peripheral surface of the metal enclosure thereof, which can improve the moisture-proof capability, the salt-mist-proof capability, the mould-proof capability and the reliability of the connector and the cavity filter.
    Type: Application
    Filed: March 8, 2013
    Publication date: March 5, 2015
    Inventor: Endong Tong
  • Patent number: 8704614
    Abstract: A cavity filter includes a base member defining therein a resonant chamber, an antenna port disposed at the center of the resonant chamber, two signal input/output ports respectively disposed at two distal ends of the resonant chamber for signal input/output, a cover member covering the base member, two feedback channels disposed in the base member at two opposite lateral sides relative to the resonant chamber and respectively connected between the signal ports and the antenna port, and wave-absorbing components respectively mounted in the feedback channels for removing surge waves from feedback frequency components in the feedback channels.
    Type: Grant
    Filed: May 25, 2011
    Date of Patent: April 22, 2014
    Assignee: Universal Microwave Technology, Inc.
    Inventors: Hsien-Wen Liu, Chien-Chih Lee, Chin-Hsuan Tsai, Shang-Yu Yang
  • Patent number: 8514034
    Abstract: A waveguide having a non-conductive material with a high permeability (?, ?r for relative permeability) and/or a high permittivity (?, ?r for relative permittivity) positioned within a housing. When compared to a hollow waveguide, the waveguide of this invention, reduces waveguide dimensions by ? 1 ? r * ? r . The waveguide of this invention further includes ridges which further reduce the size and increases the usable frequency bandwidth.
    Type: Grant
    Filed: October 15, 2010
    Date of Patent: August 20, 2013
    Assignee: UT-Battelle, LLC
    Inventor: Yoon W. Kang
  • Patent number: 8493276
    Abstract: A method and apparatus comprising a dielectric structure and a plurality of conductive segments. The dielectric structure is configured for placement in a waveguide. The plurality of conductive segments is located within the dielectric structure. Each of the plurality of conductive segments is configured to reduce a passing of a number of frequencies of electromagnetic signals traveling through the dielectric structure.
    Type: Grant
    Filed: November 19, 2009
    Date of Patent: July 23, 2013
    Assignee: The Boeing Company
    Inventors: Robert B. Greegor, Minas Hagop Tanielian
  • Publication number: 20130053104
    Abstract: A multi-mode cavity filter comprises a dielectric body having at least first and second orthogonal resonant modes; a first coupling element formed on a first face of the dielectric body for coupling energy to at least a first resonant mode; and a second coupling element formed on the first face of the dielectric body for coupling energy from the at least a first resonant mode. The dielectric body is capable of supporting a first coupling path between the first coupling element and the second coupling element via the at least a first resonant mode and a second coupling path between the first coupling element and the second coupling element, the second coupling path being such that at least partial cancellation of at least some coupled energy takes place so as to form a zero in a response of the filter.
    Type: Application
    Filed: August 23, 2012
    Publication date: February 28, 2013
    Applicant: MESAPLEXX PTY LTD
    Inventors: David Robert Hendry, Steven John Cooper, Peter Blakeborough Kenington
  • Publication number: 20120075041
    Abstract: A filter for use with a waveguide which is part of a low-noise block (LNB) for use with VSAT, satellite communications systems is described. The filter is cast into the waveguide wall at the same time as the waveguide is manufactured providing a waveguide filter with a consistent filtering performance.
    Type: Application
    Filed: April 19, 2011
    Publication date: March 29, 2012
    Inventor: Stephen Flynn
  • Patent number: 7973621
    Abstract: A HOM attenuated high frequency resonator provided with a cylindrical resonator cavity on the outer surface of which are arranged three circular tapered waveguides with two symmetrically arranged ridges each, the cut-off frequency of the waveguide base mode being kept constant over the length of the waveguides by varying the height of the ridges, and the ridge waveguides being provided at their end of the smaller diameter with an impedance transformer each for the broadband adjustment of the coaxial line is to be cost-efficiently manufacturable as a compact structure and is to be of improved attenuation properties while at the same time having, relative to prior art arrangements, a high shunt impedance for the fundamental modes.
    Type: Grant
    Filed: June 13, 2002
    Date of Patent: July 5, 2011
    Assignee: Helmholtz-Zentrum Berlin Fuer Materialien und Energie GmbH
    Inventors: Ernst Weihreter, Frank Marhauser
  • Patent number: 7952450
    Abstract: 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 resistive portion and a second dielectric card of substantially the same thickness as said first card, thereby minimizing the possibility of the resistive material coming into contact with and shorting to the resistive card opening, and reducing the required width of the card channel, while many of the problems regarding RF leakages that occur in conventional systems. Finally, more precisely centering the resistive material to the waveguide center is possible because process of affixing the two cards reduces warpage therein, and puts the resistive film symmetrically between the dielectric portions.
    Type: Grant
    Filed: September 29, 2008
    Date of Patent: May 31, 2011
    Assignee: OML, Inc.
    Inventors: Yuenie S. Lau, Anthony Denning
  • Publication number: 20110115684
    Abstract: A method and apparatus comprising a dielectric structure and a plurality of conductive segments. The dielectric structure is configured for placement in a waveguide. The plurality of conductive segments is located within the dielectric structure. Each of the plurality of conductive segments is configured to reduce a passing of a number of frequencies of electromagnetic signals traveling through the dielectric structure.
    Type: Application
    Filed: November 19, 2009
    Publication date: May 19, 2011
    Applicant: The Boeing Company
    Inventors: Robert B. Greegor, Minas Hagop Tanielian
  • Patent number: 7898368
    Abstract: A filter unit comprises a cover and a base. The cover includes a number of first grooves, and the base includes a number of second grooves aligned with the first grooves. At least one of the cover or the base includes an alloy of zinc and aluminum, wherein the weight percentage of zinc is greater than that of aluminum.
    Type: Grant
    Filed: February 11, 2009
    Date of Patent: March 1, 2011
    Assignee: Azure Shine International Inc.
    Inventor: Wen-Chao Shen
  • Publication number: 20100308938
    Abstract: The invention relates to a low-pass filter for electromagnetic signals, made up of a series of rejection elements defined by stubs (2) of length ?g/4, with a small or zero distance between them, these elements being tuned to different frequencies determining the rejection band.
    Type: Application
    Filed: January 21, 2009
    Publication date: December 9, 2010
    Applicant: TAFCO METAWIRELESS, S. L.
    Inventors: Iván Arregui Padilla, Israel Arnedo Gil, José María Lopetegui Beregaña, Miguel Ángel Gómez Laso, José Antonio Marcotegui Iturmendi
  • Patent number: 6975188
    Abstract: 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 is filled with the conductive fluid (126) in a first operational state, and the cavity is purged of the conductive fluid (126) in a second operational state. A fluid control system (150) can be provided for transferring the conductive fluid (126) in and out of the cavity in response to a control signal (174). The waveguide (102) can have a first cutoff frequency in the first operational state and a second cutoff frequency in the second operational state. Further, the waveguide (102) can have a first electrical length in the first operational state and a second electrical length in the second operational state.
    Type: Grant
    Filed: August 1, 2003
    Date of Patent: December 13, 2005
    Assignee: Harris Corporation
    Inventors: James J. Rawnick, Stephen B. Brown
  • Publication number: 20040164822
    Abstract: A HOM attenuated high frequency resonator provided with a cylindrical resonator cavity on the outer surface of which are arranged three circular tapered waveguides with two symmetrically arranged ridges each, the cut-off frequency of the waveguide base mode being kept constant over the length of the waveguides by varying the height of the ridges, and the ridge waveguides being provided at their end of the smaller diameter with an impedance transformer each for the broadband adjustment of the coaxial line is to be cost-efficiently manufacturable as a compact structure and is to be of improved attenuation properties while at the same time having, relative to prior art arrangements, a high shunt impedance for the fundamental modes.
    Type: Application
    Filed: December 11, 2003
    Publication date: August 26, 2004
    Inventors: Ernst Weihreter, Frank Marhauser
  • Patent number: 6727781
    Abstract: Disclosed is a high frequency (HF) amplifier to be used at a high frequency, typically in the range of 9 GHz to 12 GHz, in which coupling of input side and output side is prevented to achieve high gain without influence on the fidelity of amplification. The HF amplifier comprises a metal case consisting of a box type container and a lid, an amplifying element installed on a dielectric, insulating board at the bottom of the case, and leads connected to the input circuit and the output circuit of the amplifying element and extending outside through both the end walls of the case. The HF amplifier is characterized by disposition of an electromagnetic wave-absorbing sheet or sheets inside of at least one of both the side walls, the ceiling, and both the end walls so as to prevent electromagnetic coupling.
    Type: Grant
    Filed: September 17, 2001
    Date of Patent: April 27, 2004
    Assignee: Daido Steel Co., Ltd.
    Inventor: Akihiko Saito
  • Patent number: 6724280
    Abstract: An electronic device comprises a non-metallic waveguide, a tunable component mounted within the waveguide, and a conductive layer on a surface of the waveguide. The tunable component can comprise a tunable filter. The non-metallic waveguide can comprise a plastic material. Connections for applying a tuning voltage to the tunable component can be provided. A temperature sensor can be connected to the waveguide.
    Type: Grant
    Filed: March 14, 2002
    Date of Patent: April 20, 2004
    Assignee: Paratek Microwave, Inc.
    Inventors: Khosro Shamsaifar, Alden Partridge, Edward Davis, John Robinson
  • Patent number: 6633477
    Abstract: The object of the invention is to provide a conductive member capable of attenuating the noise having frequency components, for example, of the order of several GHz efficiently. Signal line 21 is formed by using the first conductive paste containing a silver powder, a ferrite powder, an organic binder, a dispersant, and a solvent.
    Type: Grant
    Filed: March 23, 2001
    Date of Patent: October 14, 2003
    Assignee: Koninklijke Philips Electronics N. V.
    Inventors: Kenichi Horie, Hiroyuki Ishida
  • Patent number: 6566973
    Abstract: An electromagnetic enclosure is provided that this configured to enclose an electrical assembly. The enclosure includes a waveguide defining a channel that one or more cables from the electrical assembly pass through. The waveguide is dimensioned to attenuate radiation having a selected frequency range. With the present invention, shielding emitted or transmitted radiation around an opening in an enclosure and around cables can be easily done.
    Type: Grant
    Filed: August 31, 2001
    Date of Patent: May 20, 2003
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventor: Richard A. Schumacher
  • Patent number: 5469024
    Abstract: A leaky wall filter for use in an EIK comprises a plurality of guidelets intersecting perpendicularly with a wall of an output waveguide of the EIK. The guidelets would propagate 2.pi. mode oscillation frequencies from the EIK out of the output waveguide. A load matched to the 2.pi. mode disposed at the end of the guidelets provides termination for the 2.pi. mode oscillation frequencies and prevents the initiation of oscillation. The load comprises a plenum disposed at an end of the guidelets opposite to the output waveguide, a window having a first surface within the plenum, and a water load provided at a second surface of the window. The 2.pi. mode oscillation frequencies propagating through the guidelets are impedance matched by the window and coupled into the water load for termination. Since a portion of the operating frequency power also leaks through the guidelets into the plenum due to insertion loss, this combined RF power also couples into the water load and is converted into thermal energy.
    Type: Grant
    Filed: January 21, 1994
    Date of Patent: November 21, 1995
    Assignee: Litton Systems, Inc.
    Inventors: Mark F. Kirshner, Robert S. Symons
  • Patent number: 4802234
    Abstract: A microwave band pass filter for filtering electromagnetic signals has a set of cavities arranged serially, with a block of dielectric material filling each cavity to define regions of each cavity which are loaded with dielectric material and regions which are free of the dielectric material. Each cavity may be viewed as a resonator for a fundamental mode of progagation of an electromagnetic wave while each block can be viewed as a resonator for higher-order modes of propagation of electromagnetic power. The cavities are separated by walls having slots aligned with the free regions of the cavities for coupling power from the fundamental mode while minimizing interaction with power of the higher-order modes. The filter enables the construction of an enlarged passband while inhibiting the presence of the spurious higher-order modes in a stop band bordering the passband.
    Type: Grant
    Filed: February 16, 1988
    Date of Patent: January 31, 1989
    Assignee: Hughes Aircraft Company
    Inventors: Paul J. Tatomir, Martin B. Hammond, Rolf Kich
  • Patent number: 4749973
    Abstract: A waveguide filter for use in a microwave oven having a plurality of metallic plates disposed in a waveguide in substantially parallel to side walls of the waveguide. The metallic plates are provided in the upper and lower edges thereof with a series of openings at a constant interval so as to provide a corrugated configuration. First members are disposed for providing a certain spacing between adjacent ones of the metallic plates and holding the metallic plates substantially in parallel to one another; and second members including metal members are disposed between the side walls of said waveguide and the ones of the metallic plates adjacent the waveguide side walls for creating a substantially uniform clearance between the upper and lower edges of the metallic plates and the upper and lower walls of the waveguide and for holding the metallic plates substantially in parallel to the waveguide side walls.
    Type: Grant
    Filed: June 9, 1986
    Date of Patent: June 7, 1988
    Assignee: Hitachi Heating Appliances Co., Ltd.
    Inventors: Kazuo Kaneko, Kohji Iwabuchi, Akikazu Harada
  • Patent number: 4680561
    Abstract: A thin plate member of electrically conductive material is disposed within a rectangular waveguide. The plate member has the thickness less than one tenth of the wavelength of a frequency to be suppressed, an opening whose maximum dimension is less than the length of the short side of the waveguide, and a gap formed between two opposite projections extending from the edge of the opening. The plate member is arranged, in said rectangular waveguide, parallel with the electric field and perpendicular to the magnetic field.
    Type: Grant
    Filed: May 29, 1985
    Date of Patent: July 14, 1987
    Assignee: Nec Corporation
    Inventor: Tadao Shirai
  • Patent number: 4661999
    Abstract: In a microwave push-pull frequency converter having the form of a waveguide for effecting frequency conversion of a broadband microwave signal, which converter includes a converter module composed of a waveguide section and a pair of semiconductor mixer elements disposed in the waveguide section for effecting frequency conversion between a high frequency microwave signal and a low frequency microwave signal without intermediate frequency conversion, the converter further including a waveguide filter for the low frequency microwave signal connected to one side of the module, the waveguide filter includes a plurality of ridged waveguide sections and a plurality of blocking waveguide sections interposed between, and coupling, the ridged waveguide sections, and the converter module includes fastening devices supporting the semiconductor mixer elements and configured to give the coverter module the form of a ridged waveguide which permits the high and low frequency microwave signals to pass in a single mode.
    Type: Grant
    Filed: November 21, 1984
    Date of Patent: April 28, 1987
    Assignee: ANT Nachrichtentechnik GmbH
    Inventors: Wolfgang Ullmann, Walter Gross
  • Patent number: 4628538
    Abstract: A television transmission system for transmitting UHF signals from a UHF signal generator, the system comprising an antenna for radiating UHF signals generated by said UHF signal generator, an overmoded section of waveguide for carrying the signals at least part of the way between the UHF signal generator and the antenna with a low level of power loss, and a high-power mode filter coupled between the antenna and the overmoded section of waveguide.
    Type: Grant
    Filed: May 13, 1985
    Date of Patent: December 9, 1986
    Assignee: Andrew Corporation
    Inventor: Laddie A. Basa
  • Patent number: 4578657
    Abstract: Filter comprising a rectangular waveguide extended at both ends by rectangular guide-to-rectangular guide couplers and provided with lateral secondary guides. In order to enable the use of cylindrical secondary guides without introducing unwanted resonances, said couplers are given, at their ends, rectangular internal cross sections both the height and width whereof are smaller at the end coupled to the primary guide than at the end remote from the primary guide.
    Type: Grant
    Filed: May 30, 1985
    Date of Patent: March 25, 1986
    Assignee: Alcatel Thomson Faisceaux Hertziens
    Inventors: Jean-Claude Cruchon, Jean-Denis Schubert
  • Patent number: 4545073
    Abstract: A magnetically tuned band reject filter for millimeter wave frequencies crising a barium ferrite sphere embedded in the upper surface of a semi-insulating gallium arsenide waveguide transmission line element located on a conductive ground plane and forming thereby an image guide. A pair of high energy rare earth permanent magnets are located on the upper and lower surfaces of the waveguide element at the location of the ferrite sphere with a single tuning coil surrounding both the magnets and the waveguide and operates to bias the ferrite sphere for selective absorption of signals propagating along the transmission line. With the magnetically tuned ferrite sphere located therebetween, both an input signal and a local oscillator signal, for example, are coupled to one end of the waveguide element while receiving electronics apparatus, such as a Schottky barrier diode mixer, is located at the other end of the waveguide element.
    Type: Grant
    Filed: February 21, 1984
    Date of Patent: October 1, 1985
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Samuel Dixon, Jr.
  • Patent number: 4540960
    Abstract: A radio frequency resonant cavity having a fundamental resonant frequency and characterized by being free of spurious modes. A plurality of spaced electrically conductive bars are arranged in a generally cylindrical array within the cavity to define a chamber between the bars and an outer solid cylindrically shaped wall of the cavity. A first and second plurality of mode perturbing rods are mounted in two groups at determined random locations to extend radially and axially into the cavity thereby to perturb spurious modes and cause their fields to extend through passageways between the bars and into the chamber. At least one body of lossy material is disposed within the chamber to damp all spurious modes that do extend into the chamber thereby enabling the cavity to operate free of undesired spurious modes.
    Type: Grant
    Filed: February 9, 1984
    Date of Patent: September 10, 1985
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventor: Salvatore Giordano
  • Patent number: 4218666
    Abstract: A dual mode band rejection filter for attenuating electromagnetic energy in a predetermined stop band having at least one resonant cavity with a pair of orthogonally related modes of propagation. The energy is propagated through a waveguide coupled to ports in the cavity. The waveguide has an input section coupled to a first cavity port, an intermediate section coupled between the first and second ports of the cavity and an output section coupled to the second port. The length of the intermediate section provides a predetermined phase shift between the first and second ports. The filter may include another dual mode resonant cavity coupled to the waveguide by additional waveguide sections.
    Type: Grant
    Filed: April 27, 1979
    Date of Patent: August 19, 1980
    Assignee: Premier Microwave Corporation
    Inventor: Richard V. Snyder
  • Patent number: 4188594
    Abstract: Films of epitaxially deposited hexagonal ferrite material backed with metal and inserted into waveguides in single and multiple stages are used to form band-pass and band-stop filters, variable attenuators and modulators. The films have body resonance modes with resonant frequencies which are essentially fixed as an externally applied magnetic field is varied. Thin films of hexagonal ferrite material have resonant frequencies in the high microwave and millimeter wavelength frequency ranges. Since hexagonal ferrites have a high magnetic anisotropy and accompanying high internal magnetic field, little or no external magnetic bias may be required once the film is magnetized.
    Type: Grant
    Filed: January 17, 1978
    Date of Patent: February 12, 1980
    Assignee: Rockwell International Corporation
    Inventor: Wayne L. Bongianni
  • Patent number: 4185257
    Abstract: One of ports of a 3dB hybrid for dividing and combining electromagnetic waves is used as an input port, and first and second resonators are electromagnetically coupled respectively with two ports to which the electromagnetic waves incident from the input port are outputted after being divided. The first and second resonators respectively comprise pluralities of opposed coupling disks sequentially arranged in the direction of travel of the electromagnetic waves and first and second reflectors disposed opposite the coupling disks farthest from the hybrid. The numbers of coupling disks of the first and second resonators are selected to differ by one. The remaining port of the hybrid is used as an output port.
    Type: Grant
    Filed: June 1, 1978
    Date of Patent: January 22, 1980
    Assignee: Nippon Telegraph and Telephone Public Corporation
    Inventor: Nobuo Nakajima