Including Evanescent Guide Sections Patents (Class 333/210)
  • Patent number: 10153533
    Abstract: A function varying a wavelength in a waveguide including a ridge-shaped conductor and columnar conductors in a parallel flat structure is added to reduce a size of a phase shifter in which input and output ports are fixed. Thus, a phased array antenna including a plurality of phase shifters is reduced in size. A plurality of convex shapes or concave shapes are provided on a conductor plate on a side not including a ridge-shaped conductor and columnar conductors. A mechanism that moves the conductor plate in a direction crossing a direction in which the ridge-shaped conductor extends is applied. After the convex shapes or the concave shapes are changed by a fixed number between phase shifters adjacent to each other, conductor plates are respectively configured by single members. A mechanism that relatively moves the conductor plates in the direction crossing the direction in which the ridge-shaped conductor extends of the phase shifter is applied.
    Type: Grant
    Filed: November 4, 2016
    Date of Patent: December 11, 2018
    Assignees: NIDEC CORPORATION
    Inventor: Hideki Kirino
  • Patent number: 9531048
    Abstract: A mode filter provides a low-loss transmission path for RF signals propagating in a first mode, while substantially suppressing at least one second mode. The mode filter includes a proximal port and a distal port, having a respective characteristic cross sectional dimension Dp1 and Dp2, and an electrically conductive hollow tube having a longitudinal axis that extends a length L between a distal end of the proximal port and a proximal end of the distal port. A cross section transverse to the longitudinal axis is non-uniform along length L and has a minimum internal characteristic dimension Dmin at least at a first longitudinal position and a maximum internal characteristic dimension Dmax at least at a second longitudinal position. The mode filter is configured to suppress the at least one second mode by at least 5 dB, and Dmax is less than 2.5 times the greater of Dp1 and Dp2.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: December 27, 2016
    Assignee: Space Systems/Loral, LLC
    Inventor: Behzad Tavassoli Hozouri
  • Patent number: 9190701
    Abstract: The present invention uses TE01(n?) single-mode resonators in different orientations that are cascaded along an evanescent mode waveguide. By exploiting multiple orthogonal evanescent modes that can alternatively by-pass, or excite the resonators, cross-coupling between non-adjacent resonators is established and properly controlled. Pseudoelliptic filters are realized without using cumbersome cross-coupled architectures, or reduced spurious performance multi-mode resonators. A 6th order filter with two transmission zeros in the lower stopband, a 5th order filter with three transmission zeros, and an 8th order filter with four transmission zeros are included as embodiments of the present invention.
    Type: Grant
    Filed: March 11, 2013
    Date of Patent: November 17, 2015
    Assignee: RS Microwave Company
    Inventors: Richard V. Snyder, Simone Bastioli
  • Patent number: 9184506
    Abstract: A waveguide antenna for a radar antenna array, particularly for use in motor vehicles, includes a metal waveguide extending in an x direction and having a longitudinal axis, which, for the propagation of a radar wave of a first mode in the x direction, delimits an inner space, wherein in order to specifically convert the first mode to a second mode of the radar wave which is different from the first mode and to couple the second mode out of the waveguide, a plurality of structural elements arranged in the x direction are provided which extend into the inner space and wherein adjacent structural elements have a distance which is larger than half a waveguide wavelength of the radar wave of the first mode or larger than half a free-space wavelength, depending on which of the two wavelengths is smaller.
    Type: Grant
    Filed: March 24, 2011
    Date of Patent: November 10, 2015
    Assignee: Conti Temic Microelectronic GmbH
    Inventors: Arnold Möbius, Wolfgang Fey
  • Patent number: 9123983
    Abstract: A tunable bandpass filter integrated circuit includes a filter core including at least two spaced conductor layers, a plurality of peripherally spaced backside vias extending between the conductor layers defining a resonator cavity, at least one internal backside via, and a tunable impedance connected in series with the internal backside via between the conductor layers for adjusting the resonance of the cavity.
    Type: Grant
    Filed: July 20, 2012
    Date of Patent: September 1, 2015
    Assignee: Hittite Microwave Corporation
    Inventor: Ekrem Oran
  • Patent number: 9024709
    Abstract: A tunable filter having an electronically tunable center frequency and dynamic bandwidth control over a large tuning range. High-Q continuously tunable evanescent-mode cavity resonators and filters using reliable RF MEMS actuators. One embodiment is a 3.4-6.2 GHz (1.8:1 tuning ratio) continuously tunable electrostatic MEMS resonator with quality factor of 460-530, with a volume of 18×30×4 mm including the actuation scheme and biasing lines. A tunable resonators is also disclosed with a 2.8:1 (5.0-1.9 GHz) tuning ratio, and Q of 300-650.
    Type: Grant
    Filed: October 3, 2009
    Date of Patent: May 5, 2015
    Assignee: Purdue Research Foundation
    Inventors: Himanshu Joshi, Hjalti Hreinn Sigmarsson, Dimitrios Peroulis, William J. Chappell, Xiaoguang Liu
  • Patent number: 8884725
    Abstract: This disclosure provides implementations of electromechanical systems (EMS) resonator structures, devices, apparatus, systems, and related processes. In one aspect, a device includes an evanescent-mode electromagnetic-wave cavity resonator. In some implementations, the cavity resonator includes a lower cavity portion and an upper cavity portion that together form a volume. The cavity resonator also includes an in-plane lithographically-defined resonator structure having a portion that is located at least partially within the volume to support one or more evanescent electromagnetic wave modes. In some implementations, an upper surface of the resonator structure is connected with the upper cavity portion while a lower mating surface is connected with the lower cavity portion.
    Type: Grant
    Filed: April 19, 2012
    Date of Patent: November 11, 2014
    Assignee: QUALCOMM MEMS Technologies, Inc.
    Inventors: Philip Jason Stephanou, Sang-June Park, Ravindra V. Shenoy
  • Publication number: 20130328644
    Abstract: The present invention uses TE01(n?) single-mode resonators in different orientations that are cascaded along an evanescent mode waveguide. By exploiting multiple orthogonal evanescent modes that can alternatively by-pass, or excite the resonators, cross-coupling between non-adjacent resonators is established and properly controlled. Pseudoelliptic filters are realized without using cumbersome cross-coupled architectures, or reduced spurious performance multi-mode resonators. A 6th order filter with two transmission zeros in the lower stopband, a 5th order filter with three transmission zeros, and an 8th order filter with four transmission zeros are included as embodiments of the present invention.
    Type: Application
    Filed: March 11, 2013
    Publication date: December 12, 2013
    Applicant: RS MICROWAVE COMPANY
    Inventors: RICHARD V. SNYDER, SIMONE BASTIOLI
  • Patent number: 8598969
    Abstract: The present invention is directed to a piezo-electrically actuated membrane (ex.—a tuner) configured for use with a tunable cavity filter. The piezo-electrically actuated tuner may be formed of printed circuit board materials and may be placed over the cavities of the tunable cavity filter. Further, the piezo-electrically actuated tuner may promote high level performance of the tunable cavity filter, while allowing the tunable cavity filter to be tunable across wide bands.
    Type: Grant
    Filed: April 15, 2011
    Date of Patent: December 3, 2013
    Assignee: Rockwell Collins, Inc.
    Inventors: Anders P. Walker, Thomas J. Journot, Todd A. Freeman, John C. Mather, Jonathan A. Lovseth
  • Patent number: 8022792
    Abstract: Waveguide filters utilizing the TM modes in an evanescent waveguide are provided. The Q of such filters surpasses any evanescent, dual and triple mode filters in propagating or evanescent waveguides. The waveguide filter in accordance with the present invention features a small size, as well as ease and simplicity in its manufacture when compared with conventional filters. Filters of exceptionally high Q and very low loss, when compared to conventional filters, can be obtained by employing TM modes in an evanescent waveguide. The TM mode evanescent filter has a higher Q than either the evanescent TE mode standard filter of a single mode propagating waveguide (TM or TE) or even the dual or triple mode filters in evanescent or propagating waveguides.
    Type: Grant
    Filed: August 29, 2008
    Date of Patent: September 20, 2011
    Inventor: John Howard
  • Patent number: 7755450
    Abstract: A waveguide correlation unit and a method for manufacturing the same are disclosed. The waveguide correlation unit includes stacked first and second waveguide plates having an identical configuration, wherein a central coupling plate is disposed therebetween. Due to the identical configuration of the first and second waveguide plates, mechanical uncertainties may significantly be reduced, since both plates may be formed in a common process without the repositioning activities during the manufacturing process.
    Type: Grant
    Filed: September 8, 2006
    Date of Patent: July 13, 2010
    Assignee: Sisvel Technology SRL
    Inventors: Riccardo Tascone, Massimo Baralis, Giuseppe Virone, Oscar Antonio Peverini, Augusto Olivieri
  • Patent number: 7692125
    Abstract: An apparatus includes a radome and an evanescent wave-coupled windowing system in the radome. In operation, the apparatus receives radiation reflected from an object that is incident upon a windowing system; emits evanescent waves from the windowing system whose amplitudes are proportional to the angle of incidence of the radiation; and non-coherent, Fresnel direction finds the object.
    Type: Grant
    Filed: November 29, 2005
    Date of Patent: April 6, 2010
    Assignee: Lockheed Martin Corporation
    Inventor: Brett A. Williams
  • Publication number: 20100052823
    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: Application
    Filed: February 11, 2009
    Publication date: March 4, 2010
    Inventor: Wen-Chao Shen
  • Publication number: 20090058564
    Abstract: Waveguide filters utilizing the TM modes in an evanescent waveguide are provided. The Q of such filters surpasses any evanescent, dual and triple mode filters in propagating or evanescent waveguides. The waveguide filter in accordance with the present invention features a small size, as well as ease and simplicity in its manufacture when compared with conventional filters. Filters of exceptionally high Q and very low loss, when compared to conventional filters, can be obtained by employing TM modes in an evanescent waveguide. The TM mode evanescent filter has a higher Q than either the evanescent TE mode standard filter of a single mode propagating waveguide (TM or TE) or even the dual or triple mode filters in evanescent or propagating waveguides.
    Type: Application
    Filed: August 29, 2008
    Publication date: March 5, 2009
    Applicant: ET INDUSTRIES, INC.
    Inventor: John Howard
  • Publication number: 20080252401
    Abstract: An evanescent mode resonator including a cavity formed in a substrate of semiconductor material. The resonator includes a capacitive post positioned within the cavity, and a tuning element positioned within the wall of the cavity proximate to the capacitive post, where a gap between the flexible element and the post sets the tuning of the resonator.
    Type: Application
    Filed: April 13, 2007
    Publication date: October 16, 2008
    Applicant: EMAG Technologies, Inc.
    Inventors: Alexandros Margomenos, Linda P.B. Katehi
  • Patent number: 7332988
    Abstract: The invention relates to a frequency filter including a structure with, on one face, two extreme evanescent areas and at least one wave guide area between the evanescent areas. The at least one wave guide area and the evanescent areas form a single closed cavity. The single cavity is partitioned by at least two resonator elements that are embedded in the single cavity at placement areas and that contribute to delimiting the at least one wave guide area and the evanescent areas.
    Type: Grant
    Filed: June 21, 2005
    Date of Patent: February 19, 2008
    Assignee: Commissariat a l'Energie Atomique
    Inventors: Francois Baleras, Pierre Blondy
  • Patent number: 7299534
    Abstract: A method of fabricating a waveguide filter includes forming a monolithic polymeric dielectric core configured for fabricating a dielectric-filled cavity, where the core includes a plurality of spaced-apart depressions; applying a layer of conducting metal to an outer surface of the core to form a metallized core with a conductive metal layer, wherein the metal layer includes port openings at opposite ends of the metallized core, and wherein metallized depressions thereby formed are the ridges of the filter's ridge-waveguide sections; and mounting the metallized core on a supporting carrier. A desired number of such filters can be connected with an electrical-series-type connection among one port of each filter to form a frequency multiplexer having a waveguide manifold.
    Type: Grant
    Filed: February 17, 2006
    Date of Patent: November 27, 2007
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Christen Rauscher
  • Patent number: 7298232
    Abstract: A waveguide filter with a signal input port at a first end and a signal output port at a second end includes a dielectric core of moldable material where the outer surface of its periphery has a metal layer with nonmetallized openings positioned at opposite ends of the filter to accommodate the input and output ports. The filter's periphery is configured to provide a cascade connection of a plurality of metal-bounded ridge-waveguide sections with interspersed metal-bounded evanescent-mode coupling regions. The filter can be joined through a manifold to realize a frequency-multiplexer, with the manifold containing a cascade connection of electrically short waveguide segments and quasi-lumped waveguide circuit components, such as irises. The filter and multiplexer are amenable to the application of cost-effective injection molding techniques to manufacture the dielectric core.
    Type: Grant
    Filed: February 17, 2006
    Date of Patent: November 20, 2007
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Christen Rauscher
  • Patent number: 7212087
    Abstract: 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 an inner periphery that surrounds a central axis extending in a direction of electromagnetic-wave propagation. The inner periphery includes surfaces parallel to H plane and E plane of the first rectangular propagation path element, and these surfaces form a staircase such that abutting sections between the surfaces parallel to H plane and the surfaces parallel to E plane constitute projections. The staircase is inclined in a direction corresponding to a direction in which H plane of the second rectangular propagation path element is inclined.
    Type: Grant
    Filed: August 5, 2004
    Date of Patent: May 1, 2007
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Tomohiro Nagai
  • Patent number: 7183883
    Abstract: An RF circuit component according to the present invention includes a waveguide 1 and at least one resonator 2, which is arranged inside the waveguide 1. The resonator 2 includes at least one patterned conductor layer, which is parallel to a plane that crosses an H plane, and resonates at a lower frequency than a cutoff frequency, which is defined by the internal dielectric constant, shape and size of the waveguide 1, thereby letting an electromagnetic wave, having a lower frequency than the cutoff frequency, pass through the inside of the waveguide 1.
    Type: Grant
    Filed: September 22, 2005
    Date of Patent: February 27, 2007
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiroshi Kanno, Kazuyuki Sakiyama, Ushio Sangawa, Tomoyasu Fujishima
  • Patent number: 6888425
    Abstract: A microstrip resonator including a dielectric substrate, a resonance electrode on a first main surface of the dielectric substrate, and a ground electrode over an entire second main surface of the dielectric substrate. The resonance electrode includes a superconducting film and a metal film deposited in that order. The ground electrode includes a superconducting film and a metal film deposited in that order. The superconducting film functions as an electrode in low-temperature operation below a critical temperature, and the metal film functions as an electrode in high-temperature operation at or above the critical temperature. The length of the superconducting film of the resonance electrode is set to be longer than that of the metal film of the resonance electrode, so that the resonance frequency in low-temperature operation is substantially equal to the resonance frequency in high-temperature operation.
    Type: Grant
    Filed: April 16, 2003
    Date of Patent: May 3, 2005
    Assignee: Murata Manufacturing Co. Ltd.
    Inventors: Norifumi Matsui, Yuji Kintaka
  • Patent number: 6850131
    Abstract: A highly compact bandpass filter that has excellent mechanical strength is disclosed. A bandpass filter according to the present invention employs a dielectric block of substantially rectangular prismatic shape constituted of a first portion lying between a first cross-section of the dielectric block and a second cross-section of the dielectric block substantially parallel to the first cross-section and second and third portions divided by the first portion and metal plates formed on surfaces of the dielectric block. The first portion of the dielectric block and the metal plates formed thereon are enabled to act as an evanescent waveguide. The second portion of the dielectric block and the metal plates formed thereon are enabled to act as a first resonator. The third portion of the dielectric block and the metal plates formed thereon are enabled to act as a second resonator. The metal plates include an inductive stub formed on the surface of the first portion of the dielectric block.
    Type: Grant
    Filed: July 31, 2002
    Date of Patent: February 1, 2005
    Assignee: TDK Corporation
    Inventor: Arun Chandra Kundu
  • Patent number: 6828880
    Abstract: A highly compact band pass filter that has excellent mechanical strength is disclosed. A band pass filter according to the present invention employs a dielectric block of substantially rectangular prismatic shape constituted of a first portion lying between a first cross-section of the dielectric block and a second cross-section of the dielectric block substantially parallel to the first cross-section and second and third portions divided by the first portion and metal plates formed on surfaces of the dielectric block. The first portion of the dielectric block and the metal plates formed thereon are enabled to act as an evanescent waveguide. The second portion of the dielectric block and the metal plates formed thereon are enabled to act as a first resonator. The third portion of the dielectric block and the metal plates formed thereon are enabled to act as a second resonator. The metal plates include at least one exciting electrode formed on a first surface of the dielectric block which has the widest area.
    Type: Grant
    Filed: September 6, 2002
    Date of Patent: December 7, 2004
    Assignee: TDK Corporation
    Inventor: Arun Chandra Kundu
  • Patent number: 6714103
    Abstract: A highly compact and easily fabricated band pass filter is disclosed. A band pass filter according to the present invention employs a first half-wave (&lgr;/2) resonator having a first open end on which an input terminal is formed and a second open end opposite to the first open end, a second half-wave (&lgr;/2) resonator having a third open end on which an output terminal is formed and a fourth open end opposite to the third open end, and an evanescent waveguide interposed between the second open end of the first resonator and the fourth open end of the second resonator. The first half-wave (&lgr;/2) resonator, the second half-wave (&lgr;/2) resonator, and the evanescent waveguide being single-unit. An air gap does not have to be formed by mounting components on a printed circuit board. Therefore, the overall size of the band pass filter can be miniaturized and fabrication of the band pass filter is simplified.
    Type: Grant
    Filed: November 2, 2001
    Date of Patent: March 30, 2004
    Assignee: TDK Corporation
    Inventor: Arun Chandra Kundu
  • Patent number: 6686208
    Abstract: The invention relates to devices and methods for carrying out quantitative fluorescence immunoassays using evanescent field excitation. Light from at least one light source is directed onto the boundary between two media which have differing refractive indices. The light source emits practically monochromatic light with a wavelength suitable for exciting a marking substance. The light is directed onto a boundary surface disposed between an optically transparent base plate, the refractive index of which is greater than that of the material above the boundary surface, and a receiving region for the sample. The receiving region is covered with a covering plate on the side disposed opposite the base plate, there being arranged between the base plate and covering plate at least one functional layer. A detector for detecting the fluorescent light is disposed on the same side of the base plate as the light source.
    Type: Grant
    Filed: August 6, 2002
    Date of Patent: February 3, 2004
    Assignee: Institut fur Chemo- und Biosensorik Munster e.V.
    Inventors: Markus Meusel, Dieter Trau, Andreas Katerkamp
  • Patent number: 6674346
    Abstract: A evanescent resonator device includes a short-circuited evanescent waveguide and loading capacitor. The evanescent waveguide of the resonator includes a single length of evanescent transmission line terminated in short circuit, a first support substrate having a predetermined dielectric constant, the first support substrate having a top surface and a bottom surface; a dielectrically loaded feed network including: (a) a second substrate arranged on the top surface of the first support substrate, the second substrate having a predetermined dielectric constant that is higher than the first support substrate; and (b) a metal strip arranged on an upper surface of the second substrate, so that the second substrate is arranged between the first support substrate and the second substrate. A ground plane is arranged on the bottom surface of the first support substrate, the support substrate includes a hollow metalized center area being open on an upper end closest to the second substrate.
    Type: Grant
    Filed: May 31, 2002
    Date of Patent: January 6, 2004
    Assignee: New Jersey Institute of Technology
    Inventors: Richard V. Snyder, Edip Niver, Keehong Um, Sanghoon Shin
  • Patent number: 6661314
    Abstract: A highly compact band pass filter that has excellent mechanical strength is disclosed. A band pass filter according to the present invention employs a dielectric block of substantially rectangular prismatic shape constituted of a first portion lying between a first cross-section of the dielectric block and a second cross-section of the dielectric block substantially parallel to the first cross-section and second and third portions divided by the first portion and metal plates formed on the surfaces of the dielectric block. The first portion of the dielectric block and the metal plates formed thereon are enabled to act as an evanescent waveguide. The second portion of the dielectric block and the metal plates formed thereon are enabled to act as a first resonator. The third portion of the dielectric block and the metal plates formed thereon are enabled to act as a second resonator.
    Type: Grant
    Filed: October 23, 2001
    Date of Patent: December 9, 2003
    Assignee: TDK Corporation
    Inventor: Arun Chandra Kundu
  • Patent number: 6657521
    Abstract: A microwave waveguide filter includes a main-line cavity structure with a group of at least two rectangular main-line cavities arrayed along a main propagation path and including a first main-line cavity and a second main-line cavity. Each main-line cavity includes a sidewall, and each pair of adjacent main-line cavities has a common transverse wall transverse to the main propagation path and a main-line aperture in the common transverse wall. A rectangular first feedback cavity is in microwave communication with each of the first main-line cavity and the second main-line cavity through the respective sidewall of the first main-line cavity and the second main-line cavity. There is a first-cavity feedback aperture between the first feedback cavity and the first main-line cavity, and a second-cavity feedback aperture between the first feedback cavity and the second main-line cavity. There may be additional feedback cavities as well.
    Type: Grant
    Filed: April 26, 2002
    Date of Patent: December 2, 2003
    Assignee: The Boeing Company
    Inventors: Paul J. Tatomir, James M. Barker, Keith N. Loi, Richard L. Bennett, Louis W. Hendrick, Rolf Kich
  • Patent number: 6646317
    Abstract: An evanescently coupled photodiode of the invention has a semiconductor substrate 1, a guide layer 3 being greater in refractive index than the semiconductor substrate, and an absorption layer 4 on a partial area of said guide layer formed in it. The mesa width of a PD region in which the absorption layer and the guide layer are formed is made wider at a part where the density of a photoelectric current is higher when the photodiode operates and more narrow at a part where the density of a photoelectric current is lower.
    Type: Grant
    Filed: November 9, 2001
    Date of Patent: November 11, 2003
    Assignee: NEC Corporation
    Inventor: Takeshi Takeuchi
  • Patent number: 6600392
    Abstract: Disclosed is a metal window filter assembly, of a millimeter wave band, using an NRD guide. The filter assembly comprises a filter housing including parallel conductive plates and a filter for filtering a certain frequency band of an electromagnetic wave traveling therethrough. The filter includes a plurality of polygonal metal windows and a single body type dielectric line made from a non-radiative dielectric. A plurality of polygonal inserting grooves spaced by the predetermined distance are formed respectively on both surfaces of the dielectric line making contact with the parallel conductive plates. The metal windows are inserted in the inserting grooves one to one to form multi-staged dielectric resonators cascaded as a single body. The filter has a filtering function selectively passing the certain frequency band determined by an impedance coupling relationship that the multi-staged dielectric resonators have with respect to the electromagnetic wave.
    Type: Grant
    Filed: October 23, 2001
    Date of Patent: July 29, 2003
    Assignee: NRD Co., Ltd.
    Inventors: Young Su Kim, Young Geun Yoo
  • Patent number: 6563402
    Abstract: A highly compact band pass filter that reliably achieves desired characteristic is disclosed. A band pass filter according to the present invention employs first and second disk resonators having exciting electrodes formed on one side surface thereof, an evanescent waveguide interposed between the first and second disk resonators, and a capacitive stub formed on other side surfaces of the first and second disk resonators. The capacitive stub reduces the size of the band pass filter because a resonant frequency of the disk resonators is lowered by the capacitive stub. Further, the capacitive stub enhances the mechanical strength of the band pass filter because a coupling constant k between the disk resonators is lowered by the capacitive stub.
    Type: Grant
    Filed: May 30, 2001
    Date of Patent: May 13, 2003
    Assignee: TDK Corporation
    Inventor: Arun Chandra Kundu
  • Publication number: 20030076200
    Abstract: A filter includes an electromagnetic wave supporting structure having a cavity defined by an encircling sidewall, and microwave feeds coupled to the cavity for inputting and for outputting electromagnetic power to and from the wave supporting structure. At least a portion of an interior surface of the sidewall has a succession of corrugations. Successive ones of the corrugations are spaced apart by a distance less than approximately 0.2 wavelength of the electromagnetic wave, and each of the corrugations has a height greater than the spacing distance but less than approximately 0.5 wavelength of the electromagnetic wave. The geometry of the corrugated sidewall reduces interaction between the electromagnetic wave and the sidewall to inhibit dissipation of power of the electromagnetic wave within the sidewall.
    Type: Application
    Filed: October 18, 2001
    Publication date: April 24, 2003
    Inventors: Slawomir J. Fiedziuszko, Torsten Schnabel
  • Patent number: 6535083
    Abstract: A ridge waveguide filter which is formed of metallized blind vias in a plurality of contiguous layers of a dielectric medium including low temperature cofired ceramic (LTCC), high temperature cofired ceramic (HTCC) or organic printed wiring boards (PWB) in the fabrication of the waveguide sidewalls and solid ground planes to provide top and bottom walls as well as in the formation of a plurality of ridge waveguide sections in an embedded ridge waveguide structure. Patterns of conductive metal are selectively printed on the outer surface of certain dielectric layers to electrically short all the vias in the ridge waveguide sections and the adjacent wall vias so that the elements behave as though they comprise a solid metal structure.
    Type: Grant
    Filed: September 4, 2001
    Date of Patent: March 18, 2003
    Assignee: Northrop Grumman Corporation
    Inventors: Michael A. Hageman, John W. Gipprich, Daniel A. Stevens, Jr., Kawthar Zaki
  • Patent number: 6529104
    Abstract: A bandpass filter makes use of at least one waveguide cavity that is thermally compensated to minimize drift of a resonant frequency of the cavity with thermal expansion of cavity components. The compensation relies on deformation of the shape of at least one cavity surface in response to thermally induced dimensional changes of the cavity. A control rod is used to limit the movement of a point on the deformed surface, while the rest of the surface moves with the thermal expansion. The control rod is made of a material having a coefficient of thermal expansion that is significantly different than that of other filter components. The rod may also be arranged to span more thermally expandable material than defines the filter such that, as the filter expands, the point of deflection is moved toward the interior of the filter beyond its original position.
    Type: Grant
    Filed: February 16, 2000
    Date of Patent: March 4, 2003
    Assignee: Andrew Passive Power Products, Inc.
    Inventors: Derek J. Small, John A. Lunn
  • Patent number: 6507252
    Abstract: An integrated circuit multiplexer comprises a waveguide having an interior cavity, first RF input port, and a first and second output ports; a dielectric structure positioned in the cavity; an RF input feed attached to the dielectric structure that extends through the RF input port; a first RF output feed attached to the dielectric structure that extends through the first RF output port; a second RF output feed attached to the dielectric structure that extends through the second RF output port; a first resonator pair mounted to the dielectric structure between the RF input feed and the first RF output feed, and electrically connected to the waveguide; and a second resonator pair mounted to the dielectric structure between the RF input feed and the second RF output feed, and electrically connected to the waveguide so that the first and second resonator pairs are generally coplanar.
    Type: Grant
    Filed: June 21, 2001
    Date of Patent: January 14, 2003
    Inventors: Thinh Q. Ho, Stephen M. Hart, Willard I. Henry
  • Publication number: 20030006865
    Abstract: Disclosed is a metal window filter assembly, of a millimeter wave band, using an NRD guide. The filter assembly comprises a filter housing including parallel conductive plates and a filter for filtering a certain frequency band of an electromagnetic wave traveling therethrough. The filter includes a plurality of polygonal metal windows and a single body type dielectric line made from a non-radiative dielectric. A plurality of polygonal inserting grooves spaced by the predetermined distance are formed respectively on both surfaces of the dielectric line making contact with the parallel conductive plates. The metal windows are inserted in the inserting grooves one to one to form multi-staged dielectric resonators cascaded as a single body. The filter has a filtering function selectively passing the certain frequency band determined by an impedance coupling relationship that the multi-staged dielectric resonators have with respect to the electromagnetic wave.
    Type: Application
    Filed: October 23, 2001
    Publication date: January 9, 2003
    Inventors: Young Su Kim, Young Geun Yoo
  • Patent number: 6285267
    Abstract: A waveguide filter having a stepped transformer area on the input and/or output sides, with at least one band-stop filter composed of geometrically closely spaced stop elements integrated into this stepped transformer area. These features make it possible to build waveguide filters with a high edge steepness and a short overall length.
    Type: Grant
    Filed: June 15, 2000
    Date of Patent: September 4, 2001
    Assignee: Robert Bosch GmbH
    Inventors: Wolfgang Hauth, Dietmar Schmitt
  • Patent number: 6232853
    Abstract: A waveguide filter is provided having a plurality of asymmetrical corrugated resonators. The filter may also include an input section and an output section including a low-pass filter unit and a transformer unit. The low-pass filter unit includes a plurality of symmetrically corrugated slots, and the transformer unit includes at least one stepped transformer section for matching the filter to an external waveguide line. Each of the asymmetrically corrugated resonators may include a pair of opposed slots of different depth, a long slot and a short slot. The resonators provide at least one reflection zero and two transmission zeros to the frequency response of the filter, thus providing high-pass, band-pass and low-pass filter properties in a single filter structure.
    Type: Grant
    Filed: March 12, 1999
    Date of Patent: May 15, 2001
    Assignee: COM DEV Limited
    Inventor: Rousslan Goulouev
  • Patent number: 6169466
    Abstract: A corrugated waveguide filter has a plurality of coupled resonator cavities arranged in a horizontal or vertical manner. The filter may include an input transformer section and an output transformer section for matching the filter to external waveguide lines. Each resonator includes at least two extracted slots (or cavities) that are grouped in close proximity to each other, and which may be symmetrically or asymmetrically implemented in the waveguide. The resonators each contribute one reflection zero and two transmission zeros to the frequency response of the filter, the reflection zero being located within the pass-band of the filter, and the two transmission zeros located either at the high-side or low-side of the pass-band depending upon whether the resonator is a low-pass type or a high-pass type. The dimensions of each resonator, including the depth of the slots and the distance between the slots, determines the position of the reflection zero and whether the resonator is low-pass or high-pass.
    Type: Grant
    Filed: May 10, 1999
    Date of Patent: January 2, 2001
    Assignee: COM DEV Limited
    Inventor: Rousslan Goulouev
  • Patent number: 6154106
    Abstract: A multilayer dielectric evanescent mode waveguide bandpass filter with resonators utilizing via hole technology is capable of achieving very narrow bandwidths with minimal insertion loss and high selectivity at microwave frequencies is provided. A typical implementation of this filter is fabricated with soft substrate multilayer dielectrics with high dielectric constant ceramics. This filter typically takes up less space than other filters presently available. A typical implementation operates at a center frequency of 1 GHz, although other center frequencies, such as approximately 0.5 GHz to approximately 60 GHz, are achievable.
    Type: Grant
    Filed: November 25, 1998
    Date of Patent: November 28, 2000
    Assignee: Merrimac Industries, Inc.
    Inventor: Rocco A. De Lillo
  • Patent number: 6137383
    Abstract: A multilayer dielectric evanescent mode waveguide bandpass filter with resonators utilizing via hole technology is capable of achieving very narrow bandwidths with minimal insertion loss and high selectivity at microwave frequencies is provided. The resonators may also be used as feed posts. A typical implementation of this filter is fabricated with soft substrate multilayer dielectrics with high dielectric constant ceramics. This filter typically takes up less space than other filters presently available. A typical implementation operates at a center frequency of 1 GHz, although other center frequencies, such as approximately 0.5 GHz to approximately 60 GHz, are achievable. The perimeter of the filter may be defined by via holes or plated slots.
    Type: Grant
    Filed: June 11, 1999
    Date of Patent: October 24, 2000
    Assignee: Merrimac Industries, Inc.
    Inventor: Rocco A. De Lillo
  • Patent number: 5959512
    Abstract: Tunable varactor diodes are utilized to adjust the filter frequency of a waveguide filter operating in evanescent mode. Because evanescent mode signals in a waveguide attenuate as they propagate, and because shunt capacitance between a waveguide and the surroundings can change the frequency at which the signals attenuate, controlling the shunt capacitance can filter the signals passing along the waveguide.
    Type: Grant
    Filed: September 19, 1997
    Date of Patent: September 28, 1999
    Assignee: Raytheon Company
    Inventor: James R. Sherman
  • Patent number: 5786739
    Abstract: 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 a superstructure with an interior recess that is contoured to provide a desired cutoff frequency. The underlying portion of the ground plane can form the lower portion of the waveguide itself, and can also be contoured to define the cutoff frequency. Adjustable attenuation is provided by a resistive card that can be inserted by different amounts into the waveguide.
    Type: Grant
    Filed: September 3, 1996
    Date of Patent: July 28, 1998
    Assignee: Hughes Electronics
    Inventors: Jeffrey A. Paul, Chaim Warzman, Roy Wien, Richard T. Hennegan
  • Patent number: 5739734
    Abstract: Apparatus and related methods for an easily manufactured evanescent mode band reject filter that provides high performance with minimal dependence on critical dimensions. According to one embodiment, the present invention provides a band reject filter including a waveguide having an input, an output, a first wall between the input and the output, and a second wall opposite the first wall. The first wall is part of a substantially solid first block, and the second wall is part of a substantially solid second block. The waveguide is capable of transmitting an electromagnetic radiation signal from the input to the output, where the signal is at an operating frequency above a waveguide cutoff frequency. The band reject filter also includes at least one cavity coupled directly to the first wall of the waveguide, where the cavity is a substantially cylindrical cavity formed in the first block.
    Type: Grant
    Filed: January 13, 1997
    Date of Patent: April 14, 1998
    Assignee: Victory Industrial Corporation
    Inventors: Ming Hui Chen, Song Mu Yang
  • Patent number: 5220300
    Abstract: A system for coupling two resonating cavities, where the coupling system provides a form of bandpass or bandstop filtering about the desired frequency mode and helps suppress undesired modes about the desired frequency mode and higher order modes. The system for coupling the two resonating cavities includes a tuned evanescent iris, where the tunability of the iris is provided by at least one tunable resonating capacitance element embedded in the iris.
    Type: Grant
    Filed: April 15, 1992
    Date of Patent: June 15, 1993
    Assignee: RS Microwave Company, Inc.
    Inventor: Richard V. Snyder
  • Patent number: 5184097
    Abstract: An agile microwave filter tunable by ferrite is constituted as a filter having dielectric confinement resonators and as a result comprises an evanescent mode waveguide and resonant cylinders placed in the waveguide. In addition, the cylinders are made of ferrite and means are provided for applying an adjustable magnetic field thereto, thereby enabling the center frequency of the filter to be shifted.
    Type: Grant
    Filed: February 15, 1991
    Date of Patent: February 2, 1993
    Assignee: Alcatel Transmission par Faisceaux Hertziens
    Inventors: Carole Brouzes, Claude Ressencourt, Alain de Place
  • Patent number: 4837535
    Abstract: A compact resonant wave filter capable of selectively propagating an electromagnetic wave of a prescribed frequency with excellent band-pass wave filter characteristics comprises a TM mode resonator disposed perpendicularly to the direction of propagation of electromagnetic wave energy, a pair of TEM mode resonators disposed one on either side or said TM mode resonator in the direction of propagation of electromagnetic wave energy, and a pair of cutoff waveguides disposed one between said TEM mode resonator and each of said TM mode resonators to couple said TEM mode resonator with said TM mode resonators in evanescent mode.
    Type: Grant
    Filed: January 5, 1989
    Date of Patent: June 6, 1989
    Assignee: Uniden Corporation
    Inventors: Yoshihiro Konishi, Kenichi Konno, Ikuo Awai
  • Patent number: 4760361
    Abstract: A double-mode filter having double-mode resonance in each resonator, with at least two dielectric resonators being accommodated within a cut-off waveguide having a given axial length. This double-mode filter is easier to design, easier to manufacture through simplified construction, and also has smaller insertion loss. No metallic bulkhead having a coupling slot is required between each pair of stages, so that lower loss is achieved or the coupling coefficient may be analytically calculated, thus realizing high-precision design.
    Type: Grant
    Filed: March 3, 1987
    Date of Patent: July 26, 1988
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Yoshio Kobayashi
  • Patent number: 4757289
    Abstract: A dielectric resonator filter applicable to any desired frequency which is required with a microwave band or a millimeter wave band communication apparatus is disclosed. A single base plate made of metal carries therewith a single or a plurality of dielectric resonators, a pair of input/output coupling members, and a pair of input/output connectors all of which are arranged directly on the base plate in a planar configuration. This base plate subassembly is shielded by a cover having a recess in a sectional view which serves as a cutoff range waveguide.
    Type: Grant
    Filed: July 16, 1986
    Date of Patent: July 12, 1988
    Assignee: NEC Corporation
    Inventors: Yuhei Kosugi, Shigeo Ogawa
  • 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