US2981949A - Flush-mounted plural waveguide slot antenna - Google Patents

Flush-mounted plural waveguide slot antenna Download PDF

Info

Publication number
US2981949A
US2981949A US607830A US60783056A US2981949A US 2981949 A US2981949 A US 2981949A US 607830 A US607830 A US 607830A US 60783056 A US60783056 A US 60783056A US 2981949 A US2981949 A US 2981949A
Authority
US
United States
Prior art keywords
sectoral
waveguides
waveguide
antenna
flush
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US607830A
Inventor
Robert S Elliott
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Raytheon Co
Original Assignee
Hughes Aircraft Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hughes Aircraft Co filed Critical Hughes Aircraft Co
Priority to US607830A priority Critical patent/US2981949A/en
Application granted granted Critical
Publication of US2981949A publication Critical patent/US2981949A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/12Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical relative movement between primary active elements and secondary devices of antennas or antenna systems
    • H01Q3/14Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical relative movement between primary active elements and secondary devices of antennas or antenna systems for varying the relative position of primary active element and a refracting or diffracting device
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/20Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00Antenna arrays or systems
    • H01Q21/0006Particular feeding systems
    • H01Q21/0012Radial guide fed arrays
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00Antenna arrays or systems
    • H01Q21/06Arrays of individually energised antenna units similarly polarised and spaced apart
    • H01Q21/20Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a curvilinear path

Definitions

  • This invention relates to beacon antennas and more particularly to a flush-mounted antenna of the end-fire type adapted either to radiate a toroidal beam or to scan a toroidal region.
  • annular corrugated surface antennas as well as many other beacon antennas employing trapping means to provide surface waves, lack a certain degree of versatility in that such antennas are primarily suitable to generate a toroidal beam pattern and are not readily adapted for scanning a beam through a toroidal region.
  • a set of identical sectoral waveguides is arranged side by side to form a circular body henceforth referred to as the antenna, having a thickness equal to that of the waveguides
  • Electromagnetic wave energy is fed to the sectoral waveguides from a central position of the antenna so that propagation takes place from the narrow opening of the sectoral waveguide in the direction of increasing radius.
  • the wide opening of the sectoral waveguides is capped and one of the parallel walls of the waveguide is provided with a radiation aperture in the form of serrations. Wave energy leaks out of the sectoral waveguides through the serrations to provide an end-fire beam in the direction of wave propagation, a phenomena well known to those skilled in the art.
  • Fig. 1 is a perspective exploded view of an embodiment of the flush-mounted beacon antenna provided in accordance with this invention
  • Fig. 2 is a fragmentary top plan view of two adjacent radial waveguides showing the position of the serrations of the flush mounted beacon antenna of Fig. 1;
  • Fig. 3 is a cross-sectional fragmentary view and Fig. 4 is a sectional view taken along line 44 of Fig. 3 of a coaxial waveguide feed system for the antenna of Fig. 1;
  • Fig. 5 is an electric field vector diagram showing the mode transition from the coaxial waveguide feed to the sectoral waveguides of the feed structure of Fig. 3;
  • Fig. 6 is a cross-sectional fragmentary view
  • Fig. 7 is a sectional view taken along line 7-7 of Fig. 6 of a scanning radial waveguide feed for the antenna of Fig. 1;
  • Fig. 8 is a cross-sectional fragmentary view and Fig. 9 is a sectional view taken along line 9-9 of Fig. 8 of a scanning horn waveguide feed for the antenna of Fig. l.
  • the antenna 10 comprises essentially a metallic lower plate 12, a metallic upper plate 14 and a metallic cylindrical shell or rim 16 all of which are symmetric with respect to an antenna axis 18.
  • the upper plate 14 and the cylindrical shell 16 together form a cover 20.
  • the lower plate 12 is provided with a number of radial planar fins 22 which serve to divide the space between the lower plate 12 and the cover 20 into a number of identical sectoral spaces 24.
  • the outer end portions 26 of the fins 22 are shown to extend to the edge 28 of the lower plate 12 so that upon assembly of the cover 20 with the lower plate 12 the end portion 26 abuts against the inner edge of the cylindrical shell 16.
  • the inner end portions 27 of the fins 22 form a cylindrical space 29 about the antenna axis 18.
  • the lower plate 12 may be supported by a hollow support 30 or any other suitable support means.
  • the cylindrical space 29 is provided with a central feed opening 32 in the lower plate 12 to allow access to a feed means.
  • the upper plate 14 contains a large number of narrow, closely spaced non-resonant slots 33 which are arranged in groups, each of the groups being associated with one of the sectoral spaces 24. Said groups of slots are known in the art as serrations.
  • the antenna 10 has been described as being made up of components such as the lower plate 12, the upper plate 14, and the rim 16, such components are merely structural details of one embodiment. Electrically and therefore basically, the antenna 10 comprises a radial waveguide which is radially subdivided starting at a predetermined radial distance by means of the fins 22 into a number of identical sectoral waveguides 24 each of which has a sectoral waveguide axis 25. Wave energy is supplied to the individual sectoral waveguides through their throats and radiated therefrom via serrations.
  • the sectoral waveguide 24 as shown particularly in Fig. 2 has two parallel top and bottom walls 38 and 40, two flared side walls 22, a throat or input port 36 and a mouth 42.
  • the mouth 42 is closed electrically to prevent the escape of wave energy therefrom.
  • Such a closure member is illustrated by the cylindrical shell 16 and may conveniently be replaced by any conductive wall inserted between the parallel top and bottom walls 38 and 40 and the two flared side walls 22.
  • the throat or input port 36 of the sectoral waveguide 24 has a width A which may have any value as long as it is greater than one-half of the wavelength of the wave energy propagated by the sectoral waveguide 24.
  • Serrations have a very similar effect as an open or leaky waveguide permitting a leaking oil of the wave energy from the sectoral waveguide 24 into space in the form of an end-fire beam.
  • the elevation pattern of such an end-fire beam depends on the relative amplitudes and phases of the wave energy contributed by each slot. Since the position of the individual slot fixes the phase of its contribution, the amplitude of each contributing wave may be controlled by adjusting the length of the individual slot. As shown in Fig. 2, the line 44 defining the aperture 34 is the generatrix of all the slot termini and its shape determines the elevation pattern of the end-fire beam.
  • the beam angle itself may be raised or lowered by properly increasing or decreasing the curvature of the parallel top and bottom sides of the sectoral waveguides.
  • Fig. 1 shows the curvature of the lower and upper plates 12, 14 to be parabolic and depending upon the desired beam angle, this curvature may be spherical, hyperbolic or conical.
  • the elevation pattern, as well as the beam angle may be controlled by changing the length of the slots 33 relative to one another and by changing the curvature of the sectoral waveguides.
  • the antenna of Fig. 1 may be provided with wave energy feed means adapted to excite and be excited by one or more of the sectoral waveguides 24 either progressively or simultaneously depending on whether an omnidirectional or a scanning beam is desired.
  • a sectoral waveguide will propagate the TE -mode of a rectangular waveguide so that any feed means extending over the region of coincidence with the throat of the sectoral waveguide 24 must be adapted to excite and be excited by such a mode.
  • an omnidirectional beam also called a toroidal beam
  • all of the sectoral waveguides 24 of the antenna 10 are excited simultaneously and in phase with one another.
  • the sectoral waveguides 24 of antenna 10 are excited progressively or sequentially and the number of waveguides excited at any instant of time will determine the azimuthal pattern of the radiated beam. Consequently, in order to obtain sharpness in the azimuthal plane, it is usually desirable to excite at least two and preferably three or four sectoral waveguides simultaneously.
  • Fig. 3 shows an embodiment of wave energy feed means adapted to excite all of said sectoral waveguides 24 simultaneously thereby to produce a toroidal beam.
  • the lower plate 12 together with the upper plate 14 and the fins 22 define the sectoral waveguides 24.
  • the lower plate 12 is supported by the hollow support member 30 which permits the axial positioning and coupling of a coaxial waveguide feed 50 to the antenna of Fig. l.
  • the coaxial waveguide feed 50 comprises an outer conductor 52 and an inner conductor 54.
  • the outer conductor 52 is coupled to the feed opening 32 in the lower plate 12 while the inner conductor 52 is coupled to the upper plate 14 as shown.
  • Fig. 5 shows diagrammatically the progressive mode change of the electric field vector E.
  • the circular cylinder 29 defined by the throats of the sectoral waveguides 24 may be likened to a radial waveguide which separates the coaxial waveguide 50 from the sectoral waveguide 24.
  • Wave energy in the principal TEM-mode of the coaxial waveguide 50 enters the radial waveguide 29 and excites the principal TEM-mode of the radial waveguide therein. This is shown by the change of the electric field vector E from a horizontal plane to a vertical plane.
  • the radial waveguide 29 propagates the principal mode radially and equally towards the edge 27 of the sectoral waveguide 24. As the electric vector E is perpendicular to the parallel walls 38 and 40, the sectoral waveguide 24 will be excited in its dominant mode.
  • Figs. 6 and 7 show an embodiment of a wave energy feed means for the antenna 10 of Fig. l which is suitable for scanning a wave energy beam through a toroidal sector.
  • the lower plate 12, the upper plate 14 and the fins 22 form the sectoral waveguides 24.
  • a coaxial waveguide feed 60 has its inner conductor 62 coupled to the center of the upper plate 14.
  • the outer conductor 64 is rigidly connected to a radial waveguide 66 which is provided with an opening 68 in its cylindrical wall 70.
  • the outer conductor 64 together with appended radial waveguide 66 is rotatably mounted with respect to the sectoral waveguides 24 defining the beacon antenna 10 of Fig. 1.
  • a motor 72 is coupled to the outer conductor 64 by a train of gears 74 providing rotation means to the radial waveguide 66.
  • a choke coupling 78 may be fixed to the lower plate 12 permitting the outer conductor 64 to rotate with respect to the choke coupling 78.
  • the width of the opening 68 must be greater than one-half of the operating wavelength within the sectoral waveguide 24 and is usually made large enough to excite two or three sectoral waveguides 24 simultaneously.
  • the directivity of the azimuth pattern is related to the number of sectoral waveguides excited simultaneously.
  • Figs. 8 and 9 show still another embodiment of a wave energy feed means for the antenna 10 of Fig. 1 suitable to provide a wave energy beam scanning through a sectoral sector.
  • the wave energy feed means of Fig. 8 supplies wave energy directly to the sectoral waveguides without any mode transformation.
  • the sectoral waveguides 24 are formed again by the lower plate 12, the upper plate 14 and the fins 22.
  • a rectangular waveguide 80 is provided with a degree bend 82 to which is afiixed an H-plane sectoral horn 84.
  • the waveguide 80 is rotatably mounted along the antenna axis 18 and may be rotated about its axis by a motor 86 coupled to the waveguide 80 by a train of gears 88 to produce a scanning beam.
  • the width of the mouth 90 of the sectoral horn 84 will determine the number of sectoral waveguides 24 fed simultaneously and therefore is determinative of the directiveness of the azimuthal pattern of the scanning beam.
  • An antenna adapted to be flush-mounted comprising: a plurality of identical sectoral waveguides, each defining a sectoral waveguide axis and each being adapted to propagate the TE -mode, said waveguides being disposed with radial symmetry about an antenna axis so that all of said sectoral waveguide axes lie in a surface of revolution and intersect said antenna axis at a common point, each of said sectoral waveguides having a throat, a mouth and a pair of parallel walls, each of said mouths of said sectoral waveguides being provided with capping means to prevent wave energy escaping therefrom, one of said parallel walls of each of said sectoral waveguides being provided with radiation aperture means to effect an exchange of wave energy between said sectoral waveguides and free space in the form of an end-fire beam, a radial waveguide adapted to propagate the dominant TEM-mode and terminated by a cylindrical wall, said cylindrical wall having a aperture equal in width to at least one of said sectoral waveguide throats, said radial
  • a beacon antenna adapted to be flush-mounted comprising: a plurality of identical sectoral waveguides, each defining a sectoral waveguide axis and each being adapted to propagate the TE -mode, said waveguides being disposed with radial symmetry about an antenna axis so that all of said sectoral waveguide axes lie in a surface of revolution and intersect said antenna axis at a common point, each of said sectoral waveguides having a throat, a mouth and a pair of substantially parallel walls, each of said mouths of said sectoral waveguides being provided with capping means to prevent wave energy escaping therefrom, one of said parallel walls of each of said sectoral waveguides being provided with a radiation aperture to effect an exchange of wave energy between said sectoral waveguides and free space in the form of a radially directed end-fire beam, a rectangular waveguide adapted to excite and be excited by wave energy in the dominant TE -mode mounted rotatably about said an tenna axis, said rectangular waveguide having
  • An antenna comprising: a pair of substantially parallel walls spaced from each other to form a volume of revolution, a plurality of radial walls disposed between said parallel walls to divide said volume into a plurality of sectoral waveguides having restricted radially inner ends for the passage of electromagnetic energy therethrough and having enlarged radially outer ends termimated to prevent the passage of energy therethrough, at least one of said parallel walls having a separate group of slots for each of said sectoral waveguides, the slots in each of said groups being arranged to couple energy be tween said sectoral waveguides and free space whereby each of said sectorial waveguides will have a predetermined pattern that extends substantially radially outwardly therefrom.
  • An antenna adapted to be mounted substantially flush with a surrounding surface, said antenna comprising a first wall adapted to be disposed substantially flush with said surface, a second wall disposed in said spaced parallel relation to said first wall to form a volume of revolution therebetween, a plurality of walls radially disposed between said parallel walls to form a plurality of sectoral waveguides, each of said sectoral waveguides having a restricted throat and an enlarged mouth, input means coupled to said throats of said sectoral waveguides for causing electromagnetic energy to be propagated therethrough, means for terminating each of said enlarged mouths to prevent the escape of said energy therethrough, a separate group of slots through said first plate for each of said sectoral waveguides, the slots in each of said groups being arranged to cause the energy in the associated waveguide to be coupled therethrough and propagated radially outwardly through space in a predetermined pattern.
  • An antenna comprising a pair of substantially parallel walls spaced from each other to form a volume of revolution, a plurality of radial walls disposed between said parallel walls to divide said volume into a plurality of sectoral waveguides having restricted radial inner ends and enlarged radial outer ends, means for sequentially feeding electromagnetic energy through preselected ones of said inner ends and into said sectoral waveguides, terminating means at each of said outer ends for preventing the loss of said energy in said waveguides through said enlarged ends, at least one of said parallel walls having a separate group of slots for each of said sectoral waveguides, the slots in each of said groups being arranged to couple energy out of said sectoral waveguides so as to be propagated radially outwardly in predetermined patterns.
  • An antenna adapted to be mounted substantially flush with a surrounding surface, said antenna comprising a first wall adapted to be disposed substantially flush with said surface, a second wall disposed in spaced parallel relation thereto to form a volume of revolution therebetween, a plurality of walls radially disposed between said parallel walls to form a plurality of sectoral waveguides, each of said sectoral waveguides having a restricted throat and an enlarged end, waveguiding means disposed adjacent said throats for sequentially feeding electromagnetic energy through preselected throats and into the associated sectoral waveguides, terminating means at each of said enlarged ends for preventing the loss of said energy in said sectoral waveguides therethrough, a separate group of slots through said first plate for each of said sectoral waveguides, the slots in each of said groups being arranged to cause the energy in the associated sectoral waveguide to be coupled therethrough and propagated radially outwardly through space in a pattern substantially coplanar with said surface.

Description

April 25,1961 R. s. ELLIOTT MOUNTED PLURAL WAVEGUIDE SLOT ANTENNA FLUSH- Filed Sept. 4, 1956 2 Sheets-Sheet l //V VE N 701?.
A T TOR/V5 Y.
April 25, 1961 R. s. ELLIOTT FLUSH-MOUNTED PLURAL WAVEGUIDE SLOT ANTENNA Filed Sept. 4, 1956 2 Sheets-Sheet 2 Robert S. Elliott,
nvvsmrom A 7' TORNE Y.
FLUSH-MOUNTED PLURAL WAVEGUIDE SLOT ANTENNA Robert S. Elliott, Los Angeles, Calif., assignor to Hughes Aircraft Company, Culver City, Calif., a corporation of Delaware Filed Sept. 4, 1956, Ser. No. 607,830 6 Claims. (Cl. 343-771) This invention relates to beacon antennas and more particularly to a flush-mounted antenna of the end-fire type adapted either to radiate a toroidal beam or to scan a toroidal region.
Heretofore, it has been proposed to produce a toroidal beam by means of an isolated half-wave antenna. Such a half-wave antenna has the disadvantage of giving rise to a very broad beam in the elevation plane making the resulting radiation pattern unsuitable for many applications which required a large gain. To increase the sharpness of the elevation pattern of toroidal beams, biconical horns have been used with success. However, when low aerodynamic drag is required in addition to a large antenna gain, biconical horns are also unsuitable. Recently, center-fed annular corrugated surface antennas have found application when aerodynamic requirements demanded a flush-mounted antenna structure. This has been described in a paper entitled An Annular Corrugated-Surface Antenna, by E. M. T. Jones, published in The Proceedings of the IRE, June 1952, vol. 40, No. 6, page 721. Even though the aerodynamic characteristics of such an antenna are excellent, the inherently limited degree of beam shaping and gain control in the elevation plane which such an antenna is capable of have restricted its application considerably. Further, annular corrugated surface antennas as well as many other beacon antennas employing trapping means to provide surface waves, lack a certain degree of versatility in that such antennas are primarily suitable to generate a toroidal beam pattern and are not readily adapted for scanning a beam through a toroidal region.
It is therefore an object of this invention to provide a flush-mounted beacon antenna of the end-fire type having a predetermined elevation pattern which pattern is not inherently limited in gain but readily adjustable to any degree of sharpness desired.
It is a further object of this invention to provide a versatile flush-mounted beacon antenna which is capable of either producing a fixed toroidal beam or of scanning a beam through a toroidal region.
It is a still further object of this invention to provide a new type of end-fire antenna which has a low aerodynamic drag, a high gain predetermined elevation pattern and which is rugged in construction and which may also be made to scan.
In accordance with this invention a set of identical sectoral waveguides is arranged side by side to form a circular body henceforth referred to as the antenna, having a thickness equal to that of the waveguides Electromagnetic wave energy is fed to the sectoral waveguides from a central position of the antenna so that propagation takes place from the narrow opening of the sectoral waveguide in the direction of increasing radius. The wide opening of the sectoral waveguides is capped and one of the parallel walls of the waveguide is provided with a radiation aperture in the form of serrations. Wave energy leaks out of the sectoral waveguides through the serrations to provide an end-fire beam in the direction of wave propagation, a phenomena well known to those skilled in the art.
When all sectoral waveguides are fed simultaneously, an omnidirectional or toroidal beam is obtained. When United States Patent Patented Apr. 25, 1961 feeding less than all the waveguides at the same time, a directional beam in the azimuth plane may be provided. Therefore, by progressively feeding adjacent sectoral waveguides a progressively sweeping or scanning beam may be obtained, the width of the beam in the azimuthal plane depending on the number of waveguides fed at any one instant of time.
Fig. 1 is a perspective exploded view of an embodiment of the flush-mounted beacon antenna provided in accordance with this invention;
Fig. 2 is a fragmentary top plan view of two adjacent radial waveguides showing the position of the serrations of the flush mounted beacon antenna of Fig. 1;
Fig. 3 is a cross-sectional fragmentary view and Fig. 4 is a sectional view taken along line 44 of Fig. 3 of a coaxial waveguide feed system for the antenna of Fig. 1;
Fig. 5 is an electric field vector diagram showing the mode transition from the coaxial waveguide feed to the sectoral waveguides of the feed structure of Fig. 3;
Fig. 6 is a cross-sectional fragmentary view, and Fig. 7 is a sectional view taken along line 7-7 of Fig. 6 of a scanning radial waveguide feed for the antenna of Fig. 1; and
Fig. 8 is a cross-sectional fragmentary view and Fig. 9 is a sectional view taken along line 9-9 of Fig. 8 of a scanning horn waveguide feed for the antenna of Fig. l.
The novel features which are believed to be characteristic of the invention, both as to its organization and method of operation, together with further objects and advantages thereof, will be better understood from the following description considered in connection with the accompanying drawings in which several embodiments of the invention are illustrated by way of example. It is to be expressly understood, however, that the drawings are for the purpose of illustration and description only, and are not intended as a definition of the limits of the invention.
Referring now to the drawings and more particularly to Figs. 1 and 2 there is shown a flush-mounted beacon antenna 10 in accordance with this invention. The antenna 10 comprises essentially a metallic lower plate 12, a metallic upper plate 14 and a metallic cylindrical shell or rim 16 all of which are symmetric with respect to an antenna axis 18. The upper plate 14 and the cylindrical shell 16 together form a cover 20.
The lower plate 12 is provided with a number of radial planar fins 22 which serve to divide the space between the lower plate 12 and the cover 20 into a number of identical sectoral spaces 24. The outer end portions 26 of the fins 22 are shown to extend to the edge 28 of the lower plate 12 so that upon assembly of the cover 20 with the lower plate 12 the end portion 26 abuts against the inner edge of the cylindrical shell 16. The inner end portions 27 of the fins 22 form a cylindrical space 29 about the antenna axis 18. The lower plate 12 may be supported by a hollow support 30 or any other suitable support means. The cylindrical space 29 is provided with a central feed opening 32 in the lower plate 12 to allow access to a feed means. The upper plate 14 contains a large number of narrow, closely spaced non-resonant slots 33 which are arranged in groups, each of the groups being associated with one of the sectoral spaces 24. Said groups of slots are known in the art as serrations.
Whereas the antenna 10 has been described as being made up of components such as the lower plate 12, the upper plate 14, and the rim 16, such components are merely structural details of one embodiment. Electrically and therefore basically, the antenna 10 comprises a radial waveguide which is radially subdivided starting at a predetermined radial distance by means of the fins 22 into a number of identical sectoral waveguides 24 each of which has a sectoral waveguide axis 25. Wave energy is supplied to the individual sectoral waveguides through their throats and radiated therefrom via serrations.
The sectoral waveguide 24 as shown particularly in Fig. 2 has two parallel top and bottom walls 38 and 40, two flared side walls 22, a throat or input port 36 and a mouth 42. The mouth 42 is closed electrically to prevent the escape of wave energy therefrom. Such a closure member is illustrated by the cylindrical shell 16 and may conveniently be replaced by any conductive wall inserted between the parallel top and bottom walls 38 and 40 and the two flared side walls 22. The throat or input port 36 of the sectoral waveguide 24 has a width A which may have any value as long as it is greater than one-half of the wavelength of the wave energy propagated by the sectoral waveguide 24.
Exchange of wave energy between the sectoral waveguides 24 and free space takes place through the serrations 34. Serrations have a very similar effect as an open or leaky waveguide permitting a leaking oil of the wave energy from the sectoral waveguide 24 into space in the form of an end-fire beam. The elevation pattern of such an end-fire beam depends on the relative amplitudes and phases of the wave energy contributed by each slot. Since the position of the individual slot fixes the phase of its contribution, the amplitude of each contributing wave may be controlled by adjusting the length of the individual slot. As shown in Fig. 2, the line 44 defining the aperture 34 is the generatrix of all the slot termini and its shape determines the elevation pattern of the end-fire beam. The beam angle itself may be raised or lowered by properly increasing or decreasing the curvature of the parallel top and bottom sides of the sectoral waveguides. Fig. 1 shows the curvature of the lower and upper plates 12, 14 to be parabolic and depending upon the desired beam angle, this curvature may be spherical, hyperbolic or conical. In other words, the elevation pattern, as well as the beam angle may be controlled by changing the length of the slots 33 relative to one another and by changing the curvature of the sectoral waveguides.
The antenna of Fig. 1 may be provided with wave energy feed means adapted to excite and be excited by one or more of the sectoral waveguides 24 either progressively or simultaneously depending on whether an omnidirectional or a scanning beam is desired. As is well known in the art, a sectoral waveguide will propagate the TE -mode of a rectangular waveguide so that any feed means extending over the region of coincidence with the throat of the sectoral waveguide 24 must be adapted to excite and be excited by such a mode.
To obtain an omnidirectional beam, also called a toroidal beam, all of the sectoral waveguides 24 of the antenna 10 are excited simultaneously and in phase with one another. For scanning a wave energy beam through a toroidal sector, the sectoral waveguides 24 of antenna 10 are excited progressively or sequentially and the number of waveguides excited at any instant of time will determine the azimuthal pattern of the radiated beam. Consequently, in order to obtain sharpness in the azimuthal plane, it is usually desirable to excite at least two and preferably three or four sectoral waveguides simultaneously.
Fig. 3 shows an embodiment of wave energy feed means adapted to excite all of said sectoral waveguides 24 simultaneously thereby to produce a toroidal beam. The lower plate 12 together with the upper plate 14 and the fins 22 define the sectoral waveguides 24. The lower plate 12 is supported by the hollow support member 30 which permits the axial positioning and coupling of a coaxial waveguide feed 50 to the antenna of Fig. l. The coaxial waveguide feed 50 comprises an outer conductor 52 and an inner conductor 54. The outer conductor 52 is coupled to the feed opening 32 in the lower plate 12 while the inner conductor 52 is coupled to the upper plate 14 as shown.
The relative position and symmetry of the fins 22 forming the sectoral waveguides 24 and the coaxial feed waveguide 50 is shown particularly in Fig. 4. It also shows the existence of the cylindrical space 29 terminated by the end portions 27 of the radial fins 22 which space is electrically equivalent to a radial waveguide.
For the purpose of illustrating the method of operation of the feed means of Figs. 3 and 4, it is helpful to look at the wave energy mode transformation from the coaxial waveguide 50 to the sectoral waveguide 24. Fig. 5 shows diagrammatically the progressive mode change of the electric field vector E. The circular cylinder 29 defined by the throats of the sectoral waveguides 24 may be likened to a radial waveguide which separates the coaxial waveguide 50 from the sectoral waveguide 24. Wave energy in the principal TEM-mode of the coaxial waveguide 50 enters the radial waveguide 29 and excites the principal TEM-mode of the radial waveguide therein. This is shown by the change of the electric field vector E from a horizontal plane to a vertical plane. The radial waveguide 29 propagates the principal mode radially and equally towards the edge 27 of the sectoral waveguide 24. As the electric vector E is perpendicular to the parallel walls 38 and 40, the sectoral waveguide 24 will be excited in its dominant mode.
Figs. 6 and 7 show an embodiment of a wave energy feed means for the antenna 10 of Fig. l which is suitable for scanning a wave energy beam through a toroidal sector. The lower plate 12, the upper plate 14 and the fins 22 form the sectoral waveguides 24. A coaxial waveguide feed 60 has its inner conductor 62 coupled to the center of the upper plate 14. The outer conductor 64 is rigidly connected to a radial waveguide 66 which is provided with an opening 68 in its cylindrical wall 70. The outer conductor 64 together with appended radial waveguide 66 is rotatably mounted with respect to the sectoral waveguides 24 defining the beacon antenna 10 of Fig. 1. A motor 72 is coupled to the outer conductor 64 by a train of gears 74 providing rotation means to the radial waveguide 66. To minimize impedance mismatches across the gap 76 formed between the radial waveguide 66 and the lower plate 12, it has been found convenient to provide a choke coupling 78 across the gap. The choke coupling 78 may be fixed to the lower plate 12 permitting the outer conductor 64 to rotate with respect to the choke coupling 78. The width of the opening 68 must be greater than one-half of the operating wavelength within the sectoral waveguide 24 and is usually made large enough to excite two or three sectoral waveguides 24 simultaneously. As mentioned before, the directivity of the azimuth pattern is related to the number of sectoral waveguides excited simultaneously.
Figs. 8 and 9 show still another embodiment of a wave energy feed means for the antenna 10 of Fig. 1 suitable to provide a wave energy beam scanning through a sectoral sector. Whereas the embodiments of the wave energy feed means shown in Fig. 3 and Fig. 6 required the interposition of a radial waveguide between the coaxial waveguide feed and the sectoral waveguides, the wave energy feed means of Fig. 8 supplies wave energy directly to the sectoral waveguides without any mode transformation. The sectoral waveguides 24 are formed again by the lower plate 12, the upper plate 14 and the fins 22. A rectangular waveguide 80 is provided with a degree bend 82 to which is afiixed an H-plane sectoral horn 84. The waveguide 80 is rotatably mounted along the antenna axis 18 and may be rotated about its axis by a motor 86 coupled to the waveguide 80 by a train of gears 88 to produce a scanning beam. The width of the mouth 90 of the sectoral horn 84 will determine the number of sectoral waveguides 24 fed simultaneously and therefore is determinative of the directiveness of the azimuthal pattern of the scanning beam.
There has been described a flush-mounted beacon antenna in accordance with this invention which provides a stationary or scanning end-fire wave energy beam. The
aerodynamic body thereby providing a dragless beacon antenna.
What is claimed is:
1. An antenna adapted to be flush-mounted comprising: a plurality of identical sectoral waveguides, each defining a sectoral waveguide axis and each being adapted to propagate the TE -mode, said waveguides being disposed with radial symmetry about an antenna axis so that all of said sectoral waveguide axes lie in a surface of revolution and intersect said antenna axis at a common point, each of said sectoral waveguides having a throat, a mouth and a pair of parallel walls, each of said mouths of said sectoral waveguides being provided with capping means to prevent wave energy escaping therefrom, one of said parallel walls of each of said sectoral waveguides being provided with radiation aperture means to effect an exchange of wave energy between said sectoral waveguides and free space in the form of an end-fire beam, a radial waveguide adapted to propagate the dominant TEM-mode and terminated by a cylindrical wall, said cylindrical wall having a aperture equal in width to at least one of said sectoral waveguide throats, said radial waveguide being mounted rotatably about said antenna axis to provide coincidence of said aperture with at least one of said sectoral waveguide throats, a coaxial waveguide feed coupled centrally to said radial waveguide, and rotating means coupled to said radial waveguide, whereby said aperture is brought sequentially into coincidence with a different one of said sectoral waveguides, thereby providing scanning of the wave energy beam through a sectoral sector.
2. A beacon antenna adapted to be flush-mounted comprising: a plurality of identical sectoral waveguides, each defining a sectoral waveguide axis and each being adapted to propagate the TE -mode, said waveguides being disposed with radial symmetry about an antenna axis so that all of said sectoral waveguide axes lie in a surface of revolution and intersect said antenna axis at a common point, each of said sectoral waveguides having a throat, a mouth and a pair of substantially parallel walls, each of said mouths of said sectoral waveguides being provided with capping means to prevent wave energy escaping therefrom, one of said parallel walls of each of said sectoral waveguides being provided with a radiation aperture to effect an exchange of wave energy between said sectoral waveguides and free space in the form of a radially directed end-fire beam, a rectangular waveguide adapted to excite and be excited by wave energy in the dominant TE -mode mounted rotatably about said an tenna axis, said rectangular waveguide having a 90- degree bend at one end thereof, an H-plane sectoral horn having a horn mouth coupled to said bend, said horn mouth being equal in width to at least two of said sectoral waveguide throats, and means for rotating said rectangular waveguide, whereby said horn mouth is sequentially brought into coincidence with the throats of different ones of said sectoral Waveguides.
3. An antenna comprising: a pair of substantially parallel walls spaced from each other to form a volume of revolution, a plurality of radial walls disposed between said parallel walls to divide said volume into a plurality of sectoral waveguides having restricted radially inner ends for the passage of electromagnetic energy therethrough and having enlarged radially outer ends termimated to prevent the passage of energy therethrough, at least one of said parallel walls having a separate group of slots for each of said sectoral waveguides, the slots in each of said groups being arranged to couple energy be tween said sectoral waveguides and free space whereby each of said sectorial waveguides will have a predetermined pattern that extends substantially radially outwardly therefrom.
4. An antenna adapted to be mounted substantially flush with a surrounding surface, said antenna comprising a first wall adapted to be disposed substantially flush with said surface, a second wall disposed in said spaced parallel relation to said first wall to form a volume of revolution therebetween, a plurality of walls radially disposed between said parallel walls to form a plurality of sectoral waveguides, each of said sectoral waveguides having a restricted throat and an enlarged mouth, input means coupled to said throats of said sectoral waveguides for causing electromagnetic energy to be propagated therethrough, means for terminating each of said enlarged mouths to prevent the escape of said energy therethrough, a separate group of slots through said first plate for each of said sectoral waveguides, the slots in each of said groups being arranged to cause the energy in the associated waveguide to be coupled therethrough and propagated radially outwardly through space in a predetermined pattern.
5. An antenna comprising a pair of substantially parallel walls spaced from each other to form a volume of revolution, a plurality of radial walls disposed between said parallel walls to divide said volume into a plurality of sectoral waveguides having restricted radial inner ends and enlarged radial outer ends, means for sequentially feeding electromagnetic energy through preselected ones of said inner ends and into said sectoral waveguides, terminating means at each of said outer ends for preventing the loss of said energy in said waveguides through said enlarged ends, at least one of said parallel walls having a separate group of slots for each of said sectoral waveguides, the slots in each of said groups being arranged to couple energy out of said sectoral waveguides so as to be propagated radially outwardly in predetermined patterns.
6. An antenna adapted to be mounted substantially flush with a surrounding surface, said antenna comprising a first wall adapted to be disposed substantially flush with said surface, a second wall disposed in spaced parallel relation thereto to form a volume of revolution therebetween, a plurality of walls radially disposed between said parallel walls to form a plurality of sectoral waveguides, each of said sectoral waveguides having a restricted throat and an enlarged end, waveguiding means disposed adjacent said throats for sequentially feeding electromagnetic energy through preselected throats and into the associated sectoral waveguides, terminating means at each of said enlarged ends for preventing the loss of said energy in said sectoral waveguides therethrough, a separate group of slots through said first plate for each of said sectoral waveguides, the slots in each of said groups being arranged to cause the energy in the associated sectoral waveguide to be coupled therethrough and propagated radially outwardly through space in a pattern substantially coplanar with said surface.
References Cited in the file of this patent France June 25, 1952
US607830A 1956-09-04 1956-09-04 Flush-mounted plural waveguide slot antenna Expired - Lifetime US2981949A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US607830A US2981949A (en) 1956-09-04 1956-09-04 Flush-mounted plural waveguide slot antenna

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US607830A US2981949A (en) 1956-09-04 1956-09-04 Flush-mounted plural waveguide slot antenna

Publications (1)

Publication Number Publication Date
US2981949A true US2981949A (en) 1961-04-25

Family

ID=24433897

Family Applications (1)

Application Number Title Priority Date Filing Date
US607830A Expired - Lifetime US2981949A (en) 1956-09-04 1956-09-04 Flush-mounted plural waveguide slot antenna

Country Status (1)

Country Link
US (1) US2981949A (en)

Cited By (161)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3184743A (en) * 1961-03-07 1965-05-18 Bell Telephone Labor Inc Antenna structures for communication satellites
US3277488A (en) * 1964-07-27 1966-10-04 John G Hoffman Antenna decoupling by means of a lossy dielectric slab
EP0047684A1 (en) * 1980-09-05 1982-03-17 Thomson-Csf Missile antenna and missile provided with such an antenna
DE3210895A1 (en) * 1982-03-25 1983-09-29 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Microwave directional antenna
DE3217437A1 (en) * 1982-03-25 1983-11-10 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt MICROWAVE DIRECTIONAL ANTENNA FROM A DIELECTRIC LINE
US4518967A (en) * 1982-03-05 1985-05-21 Ford Aerospace & Communications Corporation Tapered-width leaky-waveguide antenna
US4594595A (en) * 1984-04-18 1986-06-10 Sanders Associates, Inc. Circular log-periodic direction-finder array
US5239311A (en) * 1989-04-28 1993-08-24 Arimura Giken Kabushiki Kaisha Flat slot array antenna
US5745083A (en) * 1994-10-17 1998-04-28 Nippon Steel Corporation Slotted leaky waveguide array antenna and a method of manufacturing the same
EP2042402A1 (en) * 2007-09-25 2009-04-01 Alstom Transport S.A. Radio communication device in a guided transport means
US20090146897A1 (en) * 2003-07-14 2009-06-11 James Michael Halek Microwave demulsification of hydrocarbon emulsion
US20140354498A1 (en) * 2011-12-29 2014-12-04 Selex Es S.P.A. Slotted waveguide antenna for near-field focalization of electromagnetic radiation
US9608740B2 (en) 2015-07-15 2017-03-28 At&T Intellectual Property I, L.P. Method and apparatus for launching a wave mode that mitigates interference
US9615269B2 (en) 2014-10-02 2017-04-04 At&T Intellectual Property I, L.P. Method and apparatus that provides fault tolerance in a communication network
US9640850B2 (en) 2015-06-25 2017-05-02 At&T Intellectual Property I, L.P. Methods and apparatus for inducing a non-fundamental wave mode on a transmission medium
US9667317B2 (en) 2015-06-15 2017-05-30 At&T Intellectual Property I, L.P. Method and apparatus for providing security using network traffic adjustments
US9674711B2 (en) 2013-11-06 2017-06-06 At&T Intellectual Property I, L.P. Surface-wave communications and methods thereof
US9685992B2 (en) 2014-10-03 2017-06-20 At&T Intellectual Property I, L.P. Circuit panel network and methods thereof
US9699785B2 (en) 2012-12-05 2017-07-04 At&T Intellectual Property I, L.P. Backhaul link for distributed antenna system
US9705610B2 (en) 2014-10-21 2017-07-11 At&T Intellectual Property I, L.P. Transmission device with impairment compensation and methods for use therewith
US9705561B2 (en) 2015-04-24 2017-07-11 At&T Intellectual Property I, L.P. Directional coupling device and methods for use therewith
US9722318B2 (en) 2015-07-14 2017-08-01 At&T Intellectual Property I, L.P. Method and apparatus for coupling an antenna to a device
US9729197B2 (en) 2015-10-01 2017-08-08 At&T Intellectual Property I, L.P. Method and apparatus for communicating network management traffic over a network
US9735833B2 (en) 2015-07-31 2017-08-15 At&T Intellectual Property I, L.P. Method and apparatus for communications management in a neighborhood network
US9742462B2 (en) 2014-12-04 2017-08-22 At&T Intellectual Property I, L.P. Transmission medium and communication interfaces and methods for use therewith
US9742521B2 (en) 2014-11-20 2017-08-22 At&T Intellectual Property I, L.P. Transmission device with mode division multiplexing and methods for use therewith
US9749013B2 (en) 2015-03-17 2017-08-29 At&T Intellectual Property I, L.P. Method and apparatus for reducing attenuation of electromagnetic waves guided by a transmission medium
US9749053B2 (en) 2015-07-23 2017-08-29 At&T Intellectual Property I, L.P. Node device, repeater and methods for use therewith
US9748626B2 (en) 2015-05-14 2017-08-29 At&T Intellectual Property I, L.P. Plurality of cables having different cross-sectional shapes which are bundled together to form a transmission medium
US9762289B2 (en) 2014-10-14 2017-09-12 At&T Intellectual Property I, L.P. Method and apparatus for transmitting or receiving signals in a transportation system
US9769020B2 (en) 2014-10-21 2017-09-19 At&T Intellectual Property I, L.P. Method and apparatus for responding to events affecting communications in a communication network
US9769128B2 (en) 2015-09-28 2017-09-19 At&T Intellectual Property I, L.P. Method and apparatus for encryption of communications over a network
US9768833B2 (en) 2014-09-15 2017-09-19 At&T Intellectual Property I, L.P. Method and apparatus for sensing a condition in a transmission medium of electromagnetic waves
US9780834B2 (en) 2014-10-21 2017-10-03 At&T Intellectual Property I, L.P. Method and apparatus for transmitting electromagnetic waves
US9787412B2 (en) 2015-06-25 2017-10-10 At&T Intellectual Property I, L.P. Methods and apparatus for inducing a fundamental wave mode on a transmission medium
US9793954B2 (en) 2015-04-28 2017-10-17 At&T Intellectual Property I, L.P. Magnetic coupling device and methods for use therewith
US9793951B2 (en) 2015-07-15 2017-10-17 At&T Intellectual Property I, L.P. Method and apparatus for launching a wave mode that mitigates interference
US9793955B2 (en) 2015-04-24 2017-10-17 At&T Intellectual Property I, Lp Passive electrical coupling device and methods for use therewith
US9800327B2 (en) 2014-11-20 2017-10-24 At&T Intellectual Property I, L.P. Apparatus for controlling operations of a communication device and methods thereof
US9820146B2 (en) 2015-06-12 2017-11-14 At&T Intellectual Property I, L.P. Method and apparatus for authentication and identity management of communicating devices
US9838896B1 (en) 2016-12-09 2017-12-05 At&T Intellectual Property I, L.P. Method and apparatus for assessing network coverage
US9838078B2 (en) 2015-07-31 2017-12-05 At&T Intellectual Property I, L.P. Method and apparatus for exchanging communication signals
US9847566B2 (en) 2015-07-14 2017-12-19 At&T Intellectual Property I, L.P. Method and apparatus for adjusting a field of a signal to mitigate interference
US9847850B2 (en) 2014-10-14 2017-12-19 At&T Intellectual Property I, L.P. Method and apparatus for adjusting a mode of communication in a communication network
US9853342B2 (en) 2015-07-14 2017-12-26 At&T Intellectual Property I, L.P. Dielectric transmission medium connector and methods for use therewith
US9860075B1 (en) 2016-08-26 2018-01-02 At&T Intellectual Property I, L.P. Method and communication node for broadband distribution
US9866276B2 (en) 2014-10-10 2018-01-09 At&T Intellectual Property I, L.P. Method and apparatus for arranging communication sessions in a communication system
US9865911B2 (en) * 2015-06-25 2018-01-09 At&T Intellectual Property I, L.P. Waveguide system for slot radiating first electromagnetic waves that are combined into a non-fundamental wave mode second electromagnetic wave on a transmission medium
US9866309B2 (en) 2015-06-03 2018-01-09 At&T Intellectual Property I, Lp Host node device and methods for use therewith
US9871282B2 (en) 2015-05-14 2018-01-16 At&T Intellectual Property I, L.P. At least one transmission medium having a dielectric surface that is covered at least in part by a second dielectric
US9871558B2 (en) 2014-10-21 2018-01-16 At&T Intellectual Property I, L.P. Guided-wave transmission device and methods for use therewith
US9871283B2 (en) 2015-07-23 2018-01-16 At&T Intellectual Property I, Lp Transmission medium having a dielectric core comprised of plural members connected by a ball and socket configuration
US9876570B2 (en) 2015-02-20 2018-01-23 At&T Intellectual Property I, Lp Guided-wave transmission device with non-fundamental mode propagation and methods for use therewith
US9876264B2 (en) 2015-10-02 2018-01-23 At&T Intellectual Property I, Lp Communication system, guided wave switch and methods for use therewith
US9876605B1 (en) 2016-10-21 2018-01-23 At&T Intellectual Property I, L.P. Launcher and coupling system to support desired guided wave mode
US9882257B2 (en) 2015-07-14 2018-01-30 At&T Intellectual Property I, L.P. Method and apparatus for launching a wave mode that mitigates interference
US9887447B2 (en) 2015-05-14 2018-02-06 At&T Intellectual Property I, L.P. Transmission medium having multiple cores and methods for use therewith
US9893795B1 (en) 2016-12-07 2018-02-13 At&T Intellectual Property I, Lp Method and repeater for broadband distribution
WO2018035123A1 (en) * 2016-08-18 2018-02-22 Echodyne Corp Antenna having increased side-lobe suppression and improved side-lobe level
US9906269B2 (en) 2014-09-17 2018-02-27 At&T Intellectual Property I, L.P. Monitoring and mitigating conditions in a communication network
US9904535B2 (en) 2015-09-14 2018-02-27 At&T Intellectual Property I, L.P. Method and apparatus for distributing software
US9912033B2 (en) 2014-10-21 2018-03-06 At&T Intellectual Property I, Lp Guided wave coupler, coupling module and methods for use therewith
US9912419B1 (en) 2016-08-24 2018-03-06 At&T Intellectual Property I, L.P. Method and apparatus for managing a fault in a distributed antenna system
US9913139B2 (en) 2015-06-09 2018-03-06 At&T Intellectual Property I, L.P. Signal fingerprinting for authentication of communicating devices
US9911020B1 (en) 2016-12-08 2018-03-06 At&T Intellectual Property I, L.P. Method and apparatus for tracking via a radio frequency identification device
US9912381B2 (en) 2015-06-03 2018-03-06 At&T Intellectual Property I, Lp Network termination and methods for use therewith
US9912027B2 (en) 2015-07-23 2018-03-06 At&T Intellectual Property I, L.P. Method and apparatus for exchanging communication signals
US9917341B2 (en) 2015-05-27 2018-03-13 At&T Intellectual Property I, L.P. Apparatus and method for launching electromagnetic waves and for modifying radial dimensions of the propagating electromagnetic waves
US9929755B2 (en) 2015-07-14 2018-03-27 At&T Intellectual Property I, L.P. Method and apparatus for coupling an antenna to a device
US9930668B2 (en) 2013-05-31 2018-03-27 At&T Intellectual Property I, L.P. Remote distributed antenna system
US9927517B1 (en) 2016-12-06 2018-03-27 At&T Intellectual Property I, L.P. Apparatus and methods for sensing rainfall
US9948333B2 (en) 2015-07-23 2018-04-17 At&T Intellectual Property I, L.P. Method and apparatus for wireless communications to mitigate interference
US9948355B2 (en) 2014-10-21 2018-04-17 At&T Intellectual Property I, L.P. Apparatus for providing communication services and methods thereof
US9948354B2 (en) 2015-04-28 2018-04-17 At&T Intellectual Property I, L.P. Magnetic coupling device with reflective plate and methods for use therewith
US9954286B2 (en) 2014-10-21 2018-04-24 At&T Intellectual Property I, L.P. Guided-wave transmission device with non-fundamental mode propagation and methods for use therewith
US9954287B2 (en) 2014-11-20 2018-04-24 At&T Intellectual Property I, L.P. Apparatus for converting wireless signals and electromagnetic waves and methods thereof
US9967173B2 (en) 2015-07-31 2018-05-08 At&T Intellectual Property I, L.P. Method and apparatus for authentication and identity management of communicating devices
US9973940B1 (en) 2017-02-27 2018-05-15 At&T Intellectual Property I, L.P. Apparatus and methods for dynamic impedance matching of a guided wave launcher
US9991580B2 (en) 2016-10-21 2018-06-05 At&T Intellectual Property I, L.P. Launcher and coupling system for guided wave mode cancellation
US9997819B2 (en) 2015-06-09 2018-06-12 At&T Intellectual Property I, L.P. Transmission medium and method for facilitating propagation of electromagnetic waves via a core
US9999038B2 (en) 2013-05-31 2018-06-12 At&T Intellectual Property I, L.P. Remote distributed antenna system
US9998870B1 (en) 2016-12-08 2018-06-12 At&T Intellectual Property I, L.P. Method and apparatus for proximity sensing
US10009067B2 (en) 2014-12-04 2018-06-26 At&T Intellectual Property I, L.P. Method and apparatus for configuring a communication interface
US10009063B2 (en) 2015-09-16 2018-06-26 At&T Intellectual Property I, L.P. Method and apparatus for use with a radio distributed antenna system having an out-of-band reference signal
US10020844B2 (en) 2016-12-06 2018-07-10 T&T Intellectual Property I, L.P. Method and apparatus for broadcast communication via guided waves
US10027397B2 (en) 2016-12-07 2018-07-17 At&T Intellectual Property I, L.P. Distributed antenna system and methods for use therewith
US10027398B2 (en) 2015-06-11 2018-07-17 At&T Intellectual Property I, Lp Repeater and methods for use therewith
US10033108B2 (en) 2015-07-14 2018-07-24 At&T Intellectual Property I, L.P. Apparatus and methods for generating an electromagnetic wave having a wave mode that mitigates interference
US10044409B2 (en) 2015-07-14 2018-08-07 At&T Intellectual Property I, L.P. Transmission medium and methods for use therewith
US10069535B2 (en) 2016-12-08 2018-09-04 At&T Intellectual Property I, L.P. Apparatus and methods for launching electromagnetic waves having a certain electric field structure
US10079661B2 (en) 2015-09-16 2018-09-18 At&T Intellectual Property I, L.P. Method and apparatus for use with a radio distributed antenna system having a clock reference
US10090594B2 (en) 2016-11-23 2018-10-02 At&T Intellectual Property I, L.P. Antenna system having structural configurations for assembly
US10090606B2 (en) 2015-07-15 2018-10-02 At&T Intellectual Property I, L.P. Antenna system with dielectric array and methods for use therewith
US10103801B2 (en) 2015-06-03 2018-10-16 At&T Intellectual Property I, L.P. Host node device and methods for use therewith
US10103422B2 (en) 2016-12-08 2018-10-16 At&T Intellectual Property I, L.P. Method and apparatus for mounting network devices
US10135145B2 (en) 2016-12-06 2018-11-20 At&T Intellectual Property I, L.P. Apparatus and methods for generating an electromagnetic wave along a transmission medium
US10136434B2 (en) 2015-09-16 2018-11-20 At&T Intellectual Property I, L.P. Method and apparatus for use with a radio distributed antenna system having an ultra-wideband control channel
US10135147B2 (en) 2016-10-18 2018-11-20 At&T Intellectual Property I, L.P. Apparatus and methods for launching guided waves via an antenna
US10135146B2 (en) 2016-10-18 2018-11-20 At&T Intellectual Property I, L.P. Apparatus and methods for launching guided waves via circuits
US10139820B2 (en) 2016-12-07 2018-11-27 At&T Intellectual Property I, L.P. Method and apparatus for deploying equipment of a communication system
US10142086B2 (en) 2015-06-11 2018-11-27 At&T Intellectual Property I, L.P. Repeater and methods for use therewith
US10144036B2 (en) 2015-01-30 2018-12-04 At&T Intellectual Property I, L.P. Method and apparatus for mitigating interference affecting a propagation of electromagnetic waves guided by a transmission medium
US10148016B2 (en) 2015-07-14 2018-12-04 At&T Intellectual Property I, L.P. Apparatus and methods for communicating utilizing an antenna array
US10168695B2 (en) 2016-12-07 2019-01-01 At&T Intellectual Property I, L.P. Method and apparatus for controlling an unmanned aircraft
US10170840B2 (en) 2015-07-14 2019-01-01 At&T Intellectual Property I, L.P. Apparatus and methods for sending or receiving electromagnetic signals
US10178445B2 (en) 2016-11-23 2019-01-08 At&T Intellectual Property I, L.P. Methods, devices, and systems for load balancing between a plurality of waveguides
US10205655B2 (en) 2015-07-14 2019-02-12 At&T Intellectual Property I, L.P. Apparatus and methods for communicating utilizing an antenna array and multiple communication paths
US10225025B2 (en) 2016-11-03 2019-03-05 At&T Intellectual Property I, L.P. Method and apparatus for detecting a fault in a communication system
US10224634B2 (en) 2016-11-03 2019-03-05 At&T Intellectual Property I, L.P. Methods and apparatus for adjusting an operational characteristic of an antenna
US10243270B2 (en) 2016-12-07 2019-03-26 At&T Intellectual Property I, L.P. Beam adaptive multi-feed dielectric antenna system and methods for use therewith
US10243784B2 (en) 2014-11-20 2019-03-26 At&T Intellectual Property I, L.P. System for generating topology information and methods thereof
US10264586B2 (en) 2016-12-09 2019-04-16 At&T Mobility Ii Llc Cloud-based packet controller and methods for use therewith
US10291311B2 (en) 2016-09-09 2019-05-14 At&T Intellectual Property I, L.P. Method and apparatus for mitigating a fault in a distributed antenna system
US10291334B2 (en) 2016-11-03 2019-05-14 At&T Intellectual Property I, L.P. System for detecting a fault in a communication system
US10298293B2 (en) 2017-03-13 2019-05-21 At&T Intellectual Property I, L.P. Apparatus of communication utilizing wireless network devices
US10305190B2 (en) 2016-12-01 2019-05-28 At&T Intellectual Property I, L.P. Reflecting dielectric antenna system and methods for use therewith
US10312567B2 (en) 2016-10-26 2019-06-04 At&T Intellectual Property I, L.P. Launcher with planar strip antenna and methods for use therewith
US10320586B2 (en) 2015-07-14 2019-06-11 At&T Intellectual Property I, L.P. Apparatus and methods for generating non-interfering electromagnetic waves on an insulated transmission medium
US10326689B2 (en) 2016-12-08 2019-06-18 At&T Intellectual Property I, L.P. Method and system for providing alternative communication paths
US10326494B2 (en) 2016-12-06 2019-06-18 At&T Intellectual Property I, L.P. Apparatus for measurement de-embedding and methods for use therewith
US10341142B2 (en) 2015-07-14 2019-07-02 At&T Intellectual Property I, L.P. Apparatus and methods for generating non-interfering electromagnetic waves on an uninsulated conductor
US10340601B2 (en) 2016-11-23 2019-07-02 At&T Intellectual Property I, L.P. Multi-antenna system and methods for use therewith
US10340983B2 (en) 2016-12-09 2019-07-02 At&T Intellectual Property I, L.P. Method and apparatus for surveying remote sites via guided wave communications
US10340600B2 (en) 2016-10-18 2019-07-02 At&T Intellectual Property I, L.P. Apparatus and methods for launching guided waves via plural waveguide systems
US10340573B2 (en) 2016-10-26 2019-07-02 At&T Intellectual Property I, L.P. Launcher with cylindrical coupling device and methods for use therewith
US10340603B2 (en) 2016-11-23 2019-07-02 At&T Intellectual Property I, L.P. Antenna system having shielded structural configurations for assembly
US10355367B2 (en) 2015-10-16 2019-07-16 At&T Intellectual Property I, L.P. Antenna structure for exchanging wireless signals
US10359749B2 (en) 2016-12-07 2019-07-23 At&T Intellectual Property I, L.P. Method and apparatus for utilities management via guided wave communication
US10361489B2 (en) 2016-12-01 2019-07-23 At&T Intellectual Property I, L.P. Dielectric dish antenna system and methods for use therewith
US10374316B2 (en) 2016-10-21 2019-08-06 At&T Intellectual Property I, L.P. System and dielectric antenna with non-uniform dielectric
US10382976B2 (en) 2016-12-06 2019-08-13 At&T Intellectual Property I, L.P. Method and apparatus for managing wireless communications based on communication paths and network device positions
US10389037B2 (en) 2016-12-08 2019-08-20 At&T Intellectual Property I, L.P. Apparatus and methods for selecting sections of an antenna array and use therewith
US10389029B2 (en) 2016-12-07 2019-08-20 At&T Intellectual Property I, L.P. Multi-feed dielectric antenna system with core selection and methods for use therewith
US10411356B2 (en) 2016-12-08 2019-09-10 At&T Intellectual Property I, L.P. Apparatus and methods for selectively targeting communication devices with an antenna array
US10439675B2 (en) 2016-12-06 2019-10-08 At&T Intellectual Property I, L.P. Method and apparatus for repeating guided wave communication signals
US10446936B2 (en) 2016-12-07 2019-10-15 At&T Intellectual Property I, L.P. Multi-feed dielectric antenna system and methods for use therewith
US10498044B2 (en) 2016-11-03 2019-12-03 At&T Intellectual Property I, L.P. Apparatus for configuring a surface of an antenna
US10530505B2 (en) 2016-12-08 2020-01-07 At&T Intellectual Property I, L.P. Apparatus and methods for launching electromagnetic waves along a transmission medium
US10535928B2 (en) 2016-11-23 2020-01-14 At&T Intellectual Property I, L.P. Antenna system and methods for use therewith
US10547348B2 (en) 2016-12-07 2020-01-28 At&T Intellectual Property I, L.P. Method and apparatus for switching transmission mediums in a communication system
US10601130B2 (en) 2016-07-21 2020-03-24 Echodyne Corp. Fast beam patterns
US10601494B2 (en) 2016-12-08 2020-03-24 At&T Intellectual Property I, L.P. Dual-band communication device and method for use therewith
US10637149B2 (en) 2016-12-06 2020-04-28 At&T Intellectual Property I, L.P. Injection molded dielectric antenna and methods for use therewith
US10650940B2 (en) 2015-05-15 2020-05-12 At&T Intellectual Property I, L.P. Transmission medium having a conductive material and methods for use therewith
US10684354B2 (en) 2016-12-05 2020-06-16 Echodyne Corp. Antenna subsystem with analog beam-steering transmit array and digital beam-forming receive array
US10694379B2 (en) 2016-12-06 2020-06-23 At&T Intellectual Property I, L.P. Waveguide system with device-based authentication and methods for use therewith
US10727599B2 (en) 2016-12-06 2020-07-28 At&T Intellectual Property I, L.P. Launcher with slot antenna and methods for use therewith
US10755542B2 (en) 2016-12-06 2020-08-25 At&T Intellectual Property I, L.P. Method and apparatus for surveillance via guided wave communication
US10777873B2 (en) 2016-12-08 2020-09-15 At&T Intellectual Property I, L.P. Method and apparatus for mounting network devices
US10797781B2 (en) 2015-06-03 2020-10-06 At&T Intellectual Property I, L.P. Client node device and methods for use therewith
US10811767B2 (en) 2016-10-21 2020-10-20 At&T Intellectual Property I, L.P. System and dielectric antenna with convex dielectric radome
US10819035B2 (en) 2016-12-06 2020-10-27 At&T Intellectual Property I, L.P. Launcher with helical antenna and methods for use therewith
US10916969B2 (en) 2016-12-08 2021-02-09 At&T Intellectual Property I, L.P. Method and apparatus for providing power using an inductive coupling
US10938108B2 (en) 2016-12-08 2021-03-02 At&T Intellectual Property I, L.P. Frequency selective multi-feed dielectric antenna system and methods for use therewith
US11032819B2 (en) 2016-09-15 2021-06-08 At&T Intellectual Property I, L.P. Method and apparatus for use with a radio distributed antenna system having a control channel reference signal
US11128035B2 (en) 2019-04-19 2021-09-21 Echodyne Corp. Phase-selectable antenna unit and related antenna, subsystem, system, and method
US11223137B2 (en) * 2018-02-23 2022-01-11 Mitsubishi Electric Corporation Array antenna device
US11402462B2 (en) 2017-11-06 2022-08-02 Echodyne Corp. Intelligent sensor and intelligent feedback-based dynamic control of a parameter of a field of regard to which the sensor is directed
US11515625B2 (en) 2017-10-13 2022-11-29 Echodyne Corp. Beam-steering antenna
US11879989B2 (en) 2016-12-05 2024-01-23 Echodyne Corp. Antenna subsystem with analog beam-steering transmit array and sparse hybrid analog and digital beam-steering receive array
EP4085493A4 (en) * 2019-12-30 2024-01-24 Kymeta Corp Radial feed segmentation using wedge plates radial waveguide

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2527222A (en) * 1947-10-30 1950-10-24 Rca Corp Scanning antenna
FR1014859A (en) * 1950-03-20 1952-08-25 Csf Horizontal beams for ultra-short waves
DE868628C (en) * 1941-08-15 1953-02-26 Julius Pintsch K G Multiple radiator arrangement for directional transmission and / or reception of ultra-short electromagnetic waves
DE882430C (en) * 1951-10-02 1953-07-09 Siemens Ag Antenna for very short electric waves
US2836822A (en) * 1955-08-10 1958-05-27 Hughes Aircraft Co Method of feeding and scanning a circularly disposed antenna array
US2840818A (en) * 1954-04-15 1958-06-24 Hughes Aircraft Co Slotted antenna

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE868628C (en) * 1941-08-15 1953-02-26 Julius Pintsch K G Multiple radiator arrangement for directional transmission and / or reception of ultra-short electromagnetic waves
US2527222A (en) * 1947-10-30 1950-10-24 Rca Corp Scanning antenna
FR1014859A (en) * 1950-03-20 1952-08-25 Csf Horizontal beams for ultra-short waves
DE882430C (en) * 1951-10-02 1953-07-09 Siemens Ag Antenna for very short electric waves
US2840818A (en) * 1954-04-15 1958-06-24 Hughes Aircraft Co Slotted antenna
US2836822A (en) * 1955-08-10 1958-05-27 Hughes Aircraft Co Method of feeding and scanning a circularly disposed antenna array

Cited By (189)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3184743A (en) * 1961-03-07 1965-05-18 Bell Telephone Labor Inc Antenna structures for communication satellites
US3277488A (en) * 1964-07-27 1966-10-04 John G Hoffman Antenna decoupling by means of a lossy dielectric slab
EP0047684A1 (en) * 1980-09-05 1982-03-17 Thomson-Csf Missile antenna and missile provided with such an antenna
US4518967A (en) * 1982-03-05 1985-05-21 Ford Aerospace & Communications Corporation Tapered-width leaky-waveguide antenna
DE3210895A1 (en) * 1982-03-25 1983-09-29 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Microwave directional antenna
DE3217437A1 (en) * 1982-03-25 1983-11-10 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt MICROWAVE DIRECTIONAL ANTENNA FROM A DIELECTRIC LINE
US4594595A (en) * 1984-04-18 1986-06-10 Sanders Associates, Inc. Circular log-periodic direction-finder array
US5239311A (en) * 1989-04-28 1993-08-24 Arimura Giken Kabushiki Kaisha Flat slot array antenna
US5745083A (en) * 1994-10-17 1998-04-28 Nippon Steel Corporation Slotted leaky waveguide array antenna and a method of manufacturing the same
US20090146897A1 (en) * 2003-07-14 2009-06-11 James Michael Halek Microwave demulsification of hydrocarbon emulsion
US7889146B2 (en) * 2003-07-14 2011-02-15 Enhanced Energy, Inc. Microwave demulsification of hydrocarbon emulsion
EP2042402A1 (en) * 2007-09-25 2009-04-01 Alstom Transport S.A. Radio communication device in a guided transport means
CN101397019B (en) * 2007-09-25 2013-01-09 阿尔斯通运输股份有限公司 Radio communication device in a guided transport means
US20140354498A1 (en) * 2011-12-29 2014-12-04 Selex Es S.P.A. Slotted waveguide antenna for near-field focalization of electromagnetic radiation
US9673533B2 (en) * 2011-12-29 2017-06-06 Selex Es S.P.A. Slotted waveguide antenna for near-field focalization of electromagnetic radiation
US9699785B2 (en) 2012-12-05 2017-07-04 At&T Intellectual Property I, L.P. Backhaul link for distributed antenna system
US10194437B2 (en) 2012-12-05 2019-01-29 At&T Intellectual Property I, L.P. Backhaul link for distributed antenna system
US9788326B2 (en) 2012-12-05 2017-10-10 At&T Intellectual Property I, L.P. Backhaul link for distributed antenna system
US10051630B2 (en) 2013-05-31 2018-08-14 At&T Intellectual Property I, L.P. Remote distributed antenna system
US10091787B2 (en) 2013-05-31 2018-10-02 At&T Intellectual Property I, L.P. Remote distributed antenna system
US9930668B2 (en) 2013-05-31 2018-03-27 At&T Intellectual Property I, L.P. Remote distributed antenna system
US9999038B2 (en) 2013-05-31 2018-06-12 At&T Intellectual Property I, L.P. Remote distributed antenna system
US9674711B2 (en) 2013-11-06 2017-06-06 At&T Intellectual Property I, L.P. Surface-wave communications and methods thereof
US9768833B2 (en) 2014-09-15 2017-09-19 At&T Intellectual Property I, L.P. Method and apparatus for sensing a condition in a transmission medium of electromagnetic waves
US10063280B2 (en) 2014-09-17 2018-08-28 At&T Intellectual Property I, L.P. Monitoring and mitigating conditions in a communication network
US9906269B2 (en) 2014-09-17 2018-02-27 At&T Intellectual Property I, L.P. Monitoring and mitigating conditions in a communication network
US9973416B2 (en) 2014-10-02 2018-05-15 At&T Intellectual Property I, L.P. Method and apparatus that provides fault tolerance in a communication network
US9615269B2 (en) 2014-10-02 2017-04-04 At&T Intellectual Property I, L.P. Method and apparatus that provides fault tolerance in a communication network
US9685992B2 (en) 2014-10-03 2017-06-20 At&T Intellectual Property I, L.P. Circuit panel network and methods thereof
US9866276B2 (en) 2014-10-10 2018-01-09 At&T Intellectual Property I, L.P. Method and apparatus for arranging communication sessions in a communication system
US9762289B2 (en) 2014-10-14 2017-09-12 At&T Intellectual Property I, L.P. Method and apparatus for transmitting or receiving signals in a transportation system
US9973299B2 (en) 2014-10-14 2018-05-15 At&T Intellectual Property I, L.P. Method and apparatus for adjusting a mode of communication in a communication network
US9847850B2 (en) 2014-10-14 2017-12-19 At&T Intellectual Property I, L.P. Method and apparatus for adjusting a mode of communication in a communication network
US9948355B2 (en) 2014-10-21 2018-04-17 At&T Intellectual Property I, L.P. Apparatus for providing communication services and methods thereof
US9876587B2 (en) 2014-10-21 2018-01-23 At&T Intellectual Property I, L.P. Transmission device with impairment compensation and methods for use therewith
US9871558B2 (en) 2014-10-21 2018-01-16 At&T Intellectual Property I, L.P. Guided-wave transmission device and methods for use therewith
US9769020B2 (en) 2014-10-21 2017-09-19 At&T Intellectual Property I, L.P. Method and apparatus for responding to events affecting communications in a communication network
US9960808B2 (en) 2014-10-21 2018-05-01 At&T Intellectual Property I, L.P. Guided-wave transmission device and methods for use therewith
US9705610B2 (en) 2014-10-21 2017-07-11 At&T Intellectual Property I, L.P. Transmission device with impairment compensation and methods for use therewith
US9780834B2 (en) 2014-10-21 2017-10-03 At&T Intellectual Property I, L.P. Method and apparatus for transmitting electromagnetic waves
US9912033B2 (en) 2014-10-21 2018-03-06 At&T Intellectual Property I, Lp Guided wave coupler, coupling module and methods for use therewith
US9954286B2 (en) 2014-10-21 2018-04-24 At&T Intellectual Property I, L.P. Guided-wave transmission device with non-fundamental mode propagation and methods for use therewith
US9954287B2 (en) 2014-11-20 2018-04-24 At&T Intellectual Property I, L.P. Apparatus for converting wireless signals and electromagnetic waves and methods thereof
US9749083B2 (en) 2014-11-20 2017-08-29 At&T Intellectual Property I, L.P. Transmission device with mode division multiplexing and methods for use therewith
US10243784B2 (en) 2014-11-20 2019-03-26 At&T Intellectual Property I, L.P. System for generating topology information and methods thereof
US9800327B2 (en) 2014-11-20 2017-10-24 At&T Intellectual Property I, L.P. Apparatus for controlling operations of a communication device and methods thereof
US9742521B2 (en) 2014-11-20 2017-08-22 At&T Intellectual Property I, L.P. Transmission device with mode division multiplexing and methods for use therewith
US10009067B2 (en) 2014-12-04 2018-06-26 At&T Intellectual Property I, L.P. Method and apparatus for configuring a communication interface
US9742462B2 (en) 2014-12-04 2017-08-22 At&T Intellectual Property I, L.P. Transmission medium and communication interfaces and methods for use therewith
US10144036B2 (en) 2015-01-30 2018-12-04 At&T Intellectual Property I, L.P. Method and apparatus for mitigating interference affecting a propagation of electromagnetic waves guided by a transmission medium
US9876570B2 (en) 2015-02-20 2018-01-23 At&T Intellectual Property I, Lp Guided-wave transmission device with non-fundamental mode propagation and methods for use therewith
US9876571B2 (en) 2015-02-20 2018-01-23 At&T Intellectual Property I, Lp Guided-wave transmission device with non-fundamental mode propagation and methods for use therewith
US9749013B2 (en) 2015-03-17 2017-08-29 At&T Intellectual Property I, L.P. Method and apparatus for reducing attenuation of electromagnetic waves guided by a transmission medium
US9705561B2 (en) 2015-04-24 2017-07-11 At&T Intellectual Property I, L.P. Directional coupling device and methods for use therewith
US9831912B2 (en) 2015-04-24 2017-11-28 At&T Intellectual Property I, Lp Directional coupling device and methods for use therewith
US10224981B2 (en) 2015-04-24 2019-03-05 At&T Intellectual Property I, Lp Passive electrical coupling device and methods for use therewith
US9793955B2 (en) 2015-04-24 2017-10-17 At&T Intellectual Property I, Lp Passive electrical coupling device and methods for use therewith
US9793954B2 (en) 2015-04-28 2017-10-17 At&T Intellectual Property I, L.P. Magnetic coupling device and methods for use therewith
US9948354B2 (en) 2015-04-28 2018-04-17 At&T Intellectual Property I, L.P. Magnetic coupling device with reflective plate and methods for use therewith
US9748626B2 (en) 2015-05-14 2017-08-29 At&T Intellectual Property I, L.P. Plurality of cables having different cross-sectional shapes which are bundled together to form a transmission medium
US9887447B2 (en) 2015-05-14 2018-02-06 At&T Intellectual Property I, L.P. Transmission medium having multiple cores and methods for use therewith
US9871282B2 (en) 2015-05-14 2018-01-16 At&T Intellectual Property I, L.P. At least one transmission medium having a dielectric surface that is covered at least in part by a second dielectric
US10650940B2 (en) 2015-05-15 2020-05-12 At&T Intellectual Property I, L.P. Transmission medium having a conductive material and methods for use therewith
US9917341B2 (en) 2015-05-27 2018-03-13 At&T Intellectual Property I, L.P. Apparatus and method for launching electromagnetic waves and for modifying radial dimensions of the propagating electromagnetic waves
US10812174B2 (en) 2015-06-03 2020-10-20 At&T Intellectual Property I, L.P. Client node device and methods for use therewith
US10797781B2 (en) 2015-06-03 2020-10-06 At&T Intellectual Property I, L.P. Client node device and methods for use therewith
US10050697B2 (en) 2015-06-03 2018-08-14 At&T Intellectual Property I, L.P. Host node device and methods for use therewith
US9967002B2 (en) 2015-06-03 2018-05-08 At&T Intellectual I, Lp Network termination and methods for use therewith
US9935703B2 (en) 2015-06-03 2018-04-03 At&T Intellectual Property I, L.P. Host node device and methods for use therewith
US9866309B2 (en) 2015-06-03 2018-01-09 At&T Intellectual Property I, Lp Host node device and methods for use therewith
US10103801B2 (en) 2015-06-03 2018-10-16 At&T Intellectual Property I, L.P. Host node device and methods for use therewith
US9912382B2 (en) 2015-06-03 2018-03-06 At&T Intellectual Property I, Lp Network termination and methods for use therewith
US9912381B2 (en) 2015-06-03 2018-03-06 At&T Intellectual Property I, Lp Network termination and methods for use therewith
US9997819B2 (en) 2015-06-09 2018-06-12 At&T Intellectual Property I, L.P. Transmission medium and method for facilitating propagation of electromagnetic waves via a core
US9913139B2 (en) 2015-06-09 2018-03-06 At&T Intellectual Property I, L.P. Signal fingerprinting for authentication of communicating devices
US10142086B2 (en) 2015-06-11 2018-11-27 At&T Intellectual Property I, L.P. Repeater and methods for use therewith
US10142010B2 (en) 2015-06-11 2018-11-27 At&T Intellectual Property I, L.P. Repeater and methods for use therewith
US10027398B2 (en) 2015-06-11 2018-07-17 At&T Intellectual Property I, Lp Repeater and methods for use therewith
US9820146B2 (en) 2015-06-12 2017-11-14 At&T Intellectual Property I, L.P. Method and apparatus for authentication and identity management of communicating devices
US9667317B2 (en) 2015-06-15 2017-05-30 At&T Intellectual Property I, L.P. Method and apparatus for providing security using network traffic adjustments
US10090601B2 (en) 2015-06-25 2018-10-02 At&T Intellectual Property I, L.P. Waveguide system and methods for inducing a non-fundamental wave mode on a transmission medium
US9640850B2 (en) 2015-06-25 2017-05-02 At&T Intellectual Property I, L.P. Methods and apparatus for inducing a non-fundamental wave mode on a transmission medium
US9865911B2 (en) * 2015-06-25 2018-01-09 At&T Intellectual Property I, L.P. Waveguide system for slot radiating first electromagnetic waves that are combined into a non-fundamental wave mode second electromagnetic wave on a transmission medium
US9787412B2 (en) 2015-06-25 2017-10-10 At&T Intellectual Property I, L.P. Methods and apparatus for inducing a fundamental wave mode on a transmission medium
US10069185B2 (en) 2015-06-25 2018-09-04 At&T Intellectual Property I, L.P. Methods and apparatus for inducing a non-fundamental wave mode on a transmission medium
US10770800B2 (en) 2015-06-25 2020-09-08 At&T Intellectual Property I, L.P. Waveguide systems and methods for inducing a non-fundamental wave mode on a transmission medium
US9722318B2 (en) 2015-07-14 2017-08-01 At&T Intellectual Property I, L.P. Method and apparatus for coupling an antenna to a device
US9882257B2 (en) 2015-07-14 2018-01-30 At&T Intellectual Property I, L.P. Method and apparatus for launching a wave mode that mitigates interference
US10320586B2 (en) 2015-07-14 2019-06-11 At&T Intellectual Property I, L.P. Apparatus and methods for generating non-interfering electromagnetic waves on an insulated transmission medium
US10044409B2 (en) 2015-07-14 2018-08-07 At&T Intellectual Property I, L.P. Transmission medium and methods for use therewith
US10033108B2 (en) 2015-07-14 2018-07-24 At&T Intellectual Property I, L.P. Apparatus and methods for generating an electromagnetic wave having a wave mode that mitigates interference
US9847566B2 (en) 2015-07-14 2017-12-19 At&T Intellectual Property I, L.P. Method and apparatus for adjusting a field of a signal to mitigate interference
US9853342B2 (en) 2015-07-14 2017-12-26 At&T Intellectual Property I, L.P. Dielectric transmission medium connector and methods for use therewith
US9929755B2 (en) 2015-07-14 2018-03-27 At&T Intellectual Property I, L.P. Method and apparatus for coupling an antenna to a device
US10341142B2 (en) 2015-07-14 2019-07-02 At&T Intellectual Property I, L.P. Apparatus and methods for generating non-interfering electromagnetic waves on an uninsulated conductor
US10205655B2 (en) 2015-07-14 2019-02-12 At&T Intellectual Property I, L.P. Apparatus and methods for communicating utilizing an antenna array and multiple communication paths
US10170840B2 (en) 2015-07-14 2019-01-01 At&T Intellectual Property I, L.P. Apparatus and methods for sending or receiving electromagnetic signals
US10148016B2 (en) 2015-07-14 2018-12-04 At&T Intellectual Property I, L.P. Apparatus and methods for communicating utilizing an antenna array
US10090606B2 (en) 2015-07-15 2018-10-02 At&T Intellectual Property I, L.P. Antenna system with dielectric array and methods for use therewith
US9793951B2 (en) 2015-07-15 2017-10-17 At&T Intellectual Property I, L.P. Method and apparatus for launching a wave mode that mitigates interference
US9608740B2 (en) 2015-07-15 2017-03-28 At&T Intellectual Property I, L.P. Method and apparatus for launching a wave mode that mitigates interference
US9912027B2 (en) 2015-07-23 2018-03-06 At&T Intellectual Property I, L.P. Method and apparatus for exchanging communication signals
US9871283B2 (en) 2015-07-23 2018-01-16 At&T Intellectual Property I, Lp Transmission medium having a dielectric core comprised of plural members connected by a ball and socket configuration
US9749053B2 (en) 2015-07-23 2017-08-29 At&T Intellectual Property I, L.P. Node device, repeater and methods for use therewith
US9948333B2 (en) 2015-07-23 2018-04-17 At&T Intellectual Property I, L.P. Method and apparatus for wireless communications to mitigate interference
US9806818B2 (en) 2015-07-23 2017-10-31 At&T Intellectual Property I, Lp Node device, repeater and methods for use therewith
US9838078B2 (en) 2015-07-31 2017-12-05 At&T Intellectual Property I, L.P. Method and apparatus for exchanging communication signals
US9735833B2 (en) 2015-07-31 2017-08-15 At&T Intellectual Property I, L.P. Method and apparatus for communications management in a neighborhood network
US9967173B2 (en) 2015-07-31 2018-05-08 At&T Intellectual Property I, L.P. Method and apparatus for authentication and identity management of communicating devices
US9904535B2 (en) 2015-09-14 2018-02-27 At&T Intellectual Property I, L.P. Method and apparatus for distributing software
US10079661B2 (en) 2015-09-16 2018-09-18 At&T Intellectual Property I, L.P. Method and apparatus for use with a radio distributed antenna system having a clock reference
US10136434B2 (en) 2015-09-16 2018-11-20 At&T Intellectual Property I, L.P. Method and apparatus for use with a radio distributed antenna system having an ultra-wideband control channel
US10009063B2 (en) 2015-09-16 2018-06-26 At&T Intellectual Property I, L.P. Method and apparatus for use with a radio distributed antenna system having an out-of-band reference signal
US9769128B2 (en) 2015-09-28 2017-09-19 At&T Intellectual Property I, L.P. Method and apparatus for encryption of communications over a network
US9729197B2 (en) 2015-10-01 2017-08-08 At&T Intellectual Property I, L.P. Method and apparatus for communicating network management traffic over a network
US9876264B2 (en) 2015-10-02 2018-01-23 At&T Intellectual Property I, Lp Communication system, guided wave switch and methods for use therewith
US10355367B2 (en) 2015-10-16 2019-07-16 At&T Intellectual Property I, L.P. Antenna structure for exchanging wireless signals
US10601130B2 (en) 2016-07-21 2020-03-24 Echodyne Corp. Fast beam patterns
WO2018035123A1 (en) * 2016-08-18 2018-02-22 Echodyne Corp Antenna having increased side-lobe suppression and improved side-lobe level
US10396468B2 (en) 2016-08-18 2019-08-27 Echodyne Corp Antenna having increased side-lobe suppression and improved side-lobe level
US11211716B2 (en) 2016-08-18 2021-12-28 Echodyne Corp. Antenna having increased side-lobe suppression and improved side-lobe level
US9912419B1 (en) 2016-08-24 2018-03-06 At&T Intellectual Property I, L.P. Method and apparatus for managing a fault in a distributed antenna system
US9860075B1 (en) 2016-08-26 2018-01-02 At&T Intellectual Property I, L.P. Method and communication node for broadband distribution
US10291311B2 (en) 2016-09-09 2019-05-14 At&T Intellectual Property I, L.P. Method and apparatus for mitigating a fault in a distributed antenna system
US11032819B2 (en) 2016-09-15 2021-06-08 At&T Intellectual Property I, L.P. Method and apparatus for use with a radio distributed antenna system having a control channel reference signal
US10135146B2 (en) 2016-10-18 2018-11-20 At&T Intellectual Property I, L.P. Apparatus and methods for launching guided waves via circuits
US10340600B2 (en) 2016-10-18 2019-07-02 At&T Intellectual Property I, L.P. Apparatus and methods for launching guided waves via plural waveguide systems
US10135147B2 (en) 2016-10-18 2018-11-20 At&T Intellectual Property I, L.P. Apparatus and methods for launching guided waves via an antenna
US10374316B2 (en) 2016-10-21 2019-08-06 At&T Intellectual Property I, L.P. System and dielectric antenna with non-uniform dielectric
US9876605B1 (en) 2016-10-21 2018-01-23 At&T Intellectual Property I, L.P. Launcher and coupling system to support desired guided wave mode
US9991580B2 (en) 2016-10-21 2018-06-05 At&T Intellectual Property I, L.P. Launcher and coupling system for guided wave mode cancellation
US10811767B2 (en) 2016-10-21 2020-10-20 At&T Intellectual Property I, L.P. System and dielectric antenna with convex dielectric radome
US10340573B2 (en) 2016-10-26 2019-07-02 At&T Intellectual Property I, L.P. Launcher with cylindrical coupling device and methods for use therewith
US10312567B2 (en) 2016-10-26 2019-06-04 At&T Intellectual Property I, L.P. Launcher with planar strip antenna and methods for use therewith
US10498044B2 (en) 2016-11-03 2019-12-03 At&T Intellectual Property I, L.P. Apparatus for configuring a surface of an antenna
US10224634B2 (en) 2016-11-03 2019-03-05 At&T Intellectual Property I, L.P. Methods and apparatus for adjusting an operational characteristic of an antenna
US10291334B2 (en) 2016-11-03 2019-05-14 At&T Intellectual Property I, L.P. System for detecting a fault in a communication system
US10225025B2 (en) 2016-11-03 2019-03-05 At&T Intellectual Property I, L.P. Method and apparatus for detecting a fault in a communication system
US10178445B2 (en) 2016-11-23 2019-01-08 At&T Intellectual Property I, L.P. Methods, devices, and systems for load balancing between a plurality of waveguides
US10535928B2 (en) 2016-11-23 2020-01-14 At&T Intellectual Property I, L.P. Antenna system and methods for use therewith
US10340603B2 (en) 2016-11-23 2019-07-02 At&T Intellectual Property I, L.P. Antenna system having shielded structural configurations for assembly
US10340601B2 (en) 2016-11-23 2019-07-02 At&T Intellectual Property I, L.P. Multi-antenna system and methods for use therewith
US10090594B2 (en) 2016-11-23 2018-10-02 At&T Intellectual Property I, L.P. Antenna system having structural configurations for assembly
US10305190B2 (en) 2016-12-01 2019-05-28 At&T Intellectual Property I, L.P. Reflecting dielectric antenna system and methods for use therewith
US10361489B2 (en) 2016-12-01 2019-07-23 At&T Intellectual Property I, L.P. Dielectric dish antenna system and methods for use therewith
US10684354B2 (en) 2016-12-05 2020-06-16 Echodyne Corp. Antenna subsystem with analog beam-steering transmit array and digital beam-forming receive array
US11879989B2 (en) 2016-12-05 2024-01-23 Echodyne Corp. Antenna subsystem with analog beam-steering transmit array and sparse hybrid analog and digital beam-steering receive array
US10694379B2 (en) 2016-12-06 2020-06-23 At&T Intellectual Property I, L.P. Waveguide system with device-based authentication and methods for use therewith
US10727599B2 (en) 2016-12-06 2020-07-28 At&T Intellectual Property I, L.P. Launcher with slot antenna and methods for use therewith
US10819035B2 (en) 2016-12-06 2020-10-27 At&T Intellectual Property I, L.P. Launcher with helical antenna and methods for use therewith
US10326494B2 (en) 2016-12-06 2019-06-18 At&T Intellectual Property I, L.P. Apparatus for measurement de-embedding and methods for use therewith
US10755542B2 (en) 2016-12-06 2020-08-25 At&T Intellectual Property I, L.P. Method and apparatus for surveillance via guided wave communication
US10135145B2 (en) 2016-12-06 2018-11-20 At&T Intellectual Property I, L.P. Apparatus and methods for generating an electromagnetic wave along a transmission medium
US9927517B1 (en) 2016-12-06 2018-03-27 At&T Intellectual Property I, L.P. Apparatus and methods for sensing rainfall
US10382976B2 (en) 2016-12-06 2019-08-13 At&T Intellectual Property I, L.P. Method and apparatus for managing wireless communications based on communication paths and network device positions
US10637149B2 (en) 2016-12-06 2020-04-28 At&T Intellectual Property I, L.P. Injection molded dielectric antenna and methods for use therewith
US10020844B2 (en) 2016-12-06 2018-07-10 T&T Intellectual Property I, L.P. Method and apparatus for broadcast communication via guided waves
US10439675B2 (en) 2016-12-06 2019-10-08 At&T Intellectual Property I, L.P. Method and apparatus for repeating guided wave communication signals
US10446936B2 (en) 2016-12-07 2019-10-15 At&T Intellectual Property I, L.P. Multi-feed dielectric antenna system and methods for use therewith
US10359749B2 (en) 2016-12-07 2019-07-23 At&T Intellectual Property I, L.P. Method and apparatus for utilities management via guided wave communication
US10243270B2 (en) 2016-12-07 2019-03-26 At&T Intellectual Property I, L.P. Beam adaptive multi-feed dielectric antenna system and methods for use therewith
US10139820B2 (en) 2016-12-07 2018-11-27 At&T Intellectual Property I, L.P. Method and apparatus for deploying equipment of a communication system
US9893795B1 (en) 2016-12-07 2018-02-13 At&T Intellectual Property I, Lp Method and repeater for broadband distribution
US10389029B2 (en) 2016-12-07 2019-08-20 At&T Intellectual Property I, L.P. Multi-feed dielectric antenna system with core selection and methods for use therewith
US10547348B2 (en) 2016-12-07 2020-01-28 At&T Intellectual Property I, L.P. Method and apparatus for switching transmission mediums in a communication system
US10168695B2 (en) 2016-12-07 2019-01-01 At&T Intellectual Property I, L.P. Method and apparatus for controlling an unmanned aircraft
US10027397B2 (en) 2016-12-07 2018-07-17 At&T Intellectual Property I, L.P. Distributed antenna system and methods for use therewith
US10938108B2 (en) 2016-12-08 2021-03-02 At&T Intellectual Property I, L.P. Frequency selective multi-feed dielectric antenna system and methods for use therewith
US10916969B2 (en) 2016-12-08 2021-02-09 At&T Intellectual Property I, L.P. Method and apparatus for providing power using an inductive coupling
US10389037B2 (en) 2016-12-08 2019-08-20 At&T Intellectual Property I, L.P. Apparatus and methods for selecting sections of an antenna array and use therewith
US9911020B1 (en) 2016-12-08 2018-03-06 At&T Intellectual Property I, L.P. Method and apparatus for tracking via a radio frequency identification device
US10601494B2 (en) 2016-12-08 2020-03-24 At&T Intellectual Property I, L.P. Dual-band communication device and method for use therewith
US10530505B2 (en) 2016-12-08 2020-01-07 At&T Intellectual Property I, L.P. Apparatus and methods for launching electromagnetic waves along a transmission medium
US10069535B2 (en) 2016-12-08 2018-09-04 At&T Intellectual Property I, L.P. Apparatus and methods for launching electromagnetic waves having a certain electric field structure
US10777873B2 (en) 2016-12-08 2020-09-15 At&T Intellectual Property I, L.P. Method and apparatus for mounting network devices
US10103422B2 (en) 2016-12-08 2018-10-16 At&T Intellectual Property I, L.P. Method and apparatus for mounting network devices
US9998870B1 (en) 2016-12-08 2018-06-12 At&T Intellectual Property I, L.P. Method and apparatus for proximity sensing
US10326689B2 (en) 2016-12-08 2019-06-18 At&T Intellectual Property I, L.P. Method and system for providing alternative communication paths
US10411356B2 (en) 2016-12-08 2019-09-10 At&T Intellectual Property I, L.P. Apparatus and methods for selectively targeting communication devices with an antenna array
US10340983B2 (en) 2016-12-09 2019-07-02 At&T Intellectual Property I, L.P. Method and apparatus for surveying remote sites via guided wave communications
US10264586B2 (en) 2016-12-09 2019-04-16 At&T Mobility Ii Llc Cloud-based packet controller and methods for use therewith
US9838896B1 (en) 2016-12-09 2017-12-05 At&T Intellectual Property I, L.P. Method and apparatus for assessing network coverage
US9973940B1 (en) 2017-02-27 2018-05-15 At&T Intellectual Property I, L.P. Apparatus and methods for dynamic impedance matching of a guided wave launcher
US10298293B2 (en) 2017-03-13 2019-05-21 At&T Intellectual Property I, L.P. Apparatus of communication utilizing wireless network devices
US11515625B2 (en) 2017-10-13 2022-11-29 Echodyne Corp. Beam-steering antenna
US11402462B2 (en) 2017-11-06 2022-08-02 Echodyne Corp. Intelligent sensor and intelligent feedback-based dynamic control of a parameter of a field of regard to which the sensor is directed
US11223137B2 (en) * 2018-02-23 2022-01-11 Mitsubishi Electric Corporation Array antenna device
US11128035B2 (en) 2019-04-19 2021-09-21 Echodyne Corp. Phase-selectable antenna unit and related antenna, subsystem, system, and method
EP4085493A4 (en) * 2019-12-30 2024-01-24 Kymeta Corp Radial feed segmentation using wedge plates radial waveguide

Similar Documents

Publication Publication Date Title
US2981949A (en) Flush-mounted plural waveguide slot antenna
US2206923A (en) Short wave radio system
US3852762A (en) Scanning lens antenna
US2993205A (en) Surface wave antenna array with radiators for coupling surface wave to free space wave
US6011520A (en) Geodesic slotted cylindrical antenna
US2364371A (en) Double polarization feed for horn antennas
US4783665A (en) Hybrid mode horn antennas
US3623114A (en) Conical reflector antenna
US4042935A (en) Wideband multiplexing antenna feed employing cavity backed wing dipoles
US2754513A (en) Antenna
US3568204A (en) Multimode antenna feed system having a plurality of tracking elements mounted symmetrically about the inner walls and at the aperture end of a scalar horn
Kildal The hat feed: A dual-mode rear-radiating waveguide antenna having low cross polarization
US2764757A (en) Metallic lens antennas
US2650985A (en) Radio horn
US3032762A (en) Circularly arrayed slot antenna
US2846678A (en) Dual frequency antenna
US3500419A (en) Dual frequency,dual polarized cassegrain antenna
US3274603A (en) Wide angle horn feed closely spaced to main reflector
US2994873A (en) Beam-waveguide antenna
US4477816A (en) Corrugated antenna feed horn with means for radiation pattern control
US3938159A (en) Dual frequency feed horn using notched fins for phase and amplitude control
US3775773A (en) Technique for generating planar beams from a linear doppler line source employing a circular parallel-plate waveguide
US2556046A (en) Directional antenna system
US4014027A (en) Omnidirectional antenna for around a mast
US2785397A (en) Annular lens antenna