US3383694A - Rotatable directional antenna attachment for use with a vertical antenna rod - Google Patents

Rotatable directional antenna attachment for use with a vertical antenna rod Download PDF

Info

Publication number
US3383694A
US3383694A US432510A US43251065A US3383694A US 3383694 A US3383694 A US 3383694A US 432510 A US432510 A US 432510A US 43251065 A US43251065 A US 43251065A US 3383694 A US3383694 A US 3383694A
Authority
US
United States
Prior art keywords
base
antenna
rod
director
vertical
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
US432510A
Inventor
Jr Carll F Strohmeyer
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.)
CARLL F STROHMEYER JR
Original Assignee
Carll F. Strohmeyer Jr.
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 Carll F. Strohmeyer Jr. filed Critical Carll F. Strohmeyer Jr.
Priority to US432510A priority Critical patent/US3383694A/en
Application granted granted Critical
Publication of US3383694A publication Critical patent/US3383694A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/28—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using a secondary device in the form of two or more substantially straight conductive elements
    • H01Q19/30—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using a secondary device in the form of two or more substantially straight conductive elements the primary active element being centre-fed and substantially straight, e.g. Yagi antenna
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/02—Arrangements 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 movement of antenna or antenna system as a whole
    • H01Q3/04—Arrangements 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 movement of antenna or antenna system as a whole for varying one co-ordinate of the orientation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/32—Articulated members
    • Y10T403/32254—Lockable at fixed position
    • Y10T403/32467—Telescoping members
    • Y10T403/32475—Telescoping members having detent
    • Y10T403/32501—Cam or wedge

Definitions

  • a directional antenna attachment for use with an installed vertical active antenna rod having an insulation mounting member at its lower end comprising a horizontally elongated metallic base provided intermediate its ends with an aperture for rotatable positioning of said base on the stated mounting member, a director antenna and a reflector antenna rod carried by opposite end portions of the base, and means adjustably mounting the director and reflector antenna rods on the base for movement thereof toward and away from the aperture.
  • the base comprises a plurality of slidably connected and longitudinally extensible and retracted base portions.
  • Both the director and reflector antenna rods include a plurality of slidably telescoped extensible and retractable rod sections.
  • This invention relates to new and useful improvements in directional antennas used for radio or similar purposes, and in particular the invention concerns itself with a directional antenna embodying a vertical active antenna rod together with director and reflector antenna rods carried by a horizontally elongated base at opposite sides of the active rod, the base being rotatable in a horizontal plane to permit the antenna to be oriented in a desired direction for optimum transmission and/or reception of signals.
  • the principal object of the invention is to provide a directional antenna of this type which is very simple in construction, highly efilcient in operation, which may be quickly and easily adjusted as to positional relationship between the director and reflector rods and the active rod, and which may be conveniently folded or collapsed into a compact form when it is not in use.
  • the directional antenna of the invention has general utility, it is especially adapted for use in the environment of mobile antennas such as are commonly carried by automobiles or other vehicles.
  • a conventional single active antenna already provided on the vehicle may be readily converted into a directional antenna by simply applying the director and reflector rods of the invention with their carrying base to the conventional active antenna to obtain the desired directional transmission and/or reception of signals.
  • FIGURE 1 is a side elevational view of the directional antenna of the invention
  • FIGURE 2 is a top plan view thereof
  • FIGURE 3 is an enlarged, fragmentary sectional view, taken substantially in the plane of the line 3-3 in FIG- URE 2;
  • FIGURE 4 is a cross-sectional view, taken substantially in the plane of the line 4-4 in FIGURE 3.
  • the directional antenna in accordance with the invention is designated generally by the reference numeral and embodies in its construction a conventional active antenna 11 and what may be referred to as a directional antenna attachment 12.
  • the active antenna 11 is of the usual type including a vertical rod 13 provided at its lower end with a mounting member 14 of insulating material, the member 14 being suitably secured to supporting structure, as for example, to the top of a vehicle indicated by the dotted lines 15.
  • the mounting member 14 includes the usual hexagonal bottom portion 14' and a substantially semi-spherical upper portion 14 (see FIG. 3), the upper portion 14 being equipped with a metallic socket 16 in which the lower end of the rod 13 is secured.
  • the directional antenna attachment 12 of the invention comprises a metallic, horizontally elongated base 17, including an inverted channel-shaped center portion 18 and a pair of strap-like end portions 19 which are slidably telescoped in the ends of the center portion, as will be clearly apparent from FIGS. 3 and 4.
  • the ends of the center portion 18 are provided with longitudinal, openended slots 20 to adjustably receive bolts 21 carried by the inner ends of the end portions 19, so that by sliding the portions 18, 19 of the base together or apart, the overall length of the base may be varied.
  • Suitable washers 22 and nuts 23 are provided on the bolts 21 for locking the base portions in a desired adjusted position.
  • the base center portion 18 is provided with a central opening or aperture 24 for rotatable reception of the upper portion 14" of the aforementioned mounting member 14, whereby the entire base 17 may be manually rotated about the member 14 in a horizontal plane, it being noted that the base projects diametrically to opposite directions from the member 14, as shown.
  • the respective end portions 19, 19 of the base 17 carry a director antenna rod 25 and a reflector antenna rod 26 which are identical in construction and each comprises a rod member 27 pivotally secured at its lower end as at 28 to a fastener 29, the latter including a socket 30 similar to the aforementioned socket 16 and a bolt, nut and washer assembly 31 for fastening the socket 30 to the associated end portion 19 of the base 17.
  • the base end portions 19 are provided with longitudinal, open-ended slots 32 which adjustably receive the bolt assemblies 31 so that the director antenna 25 and the reflector antenna 26 may be moved toward or away from the active antenna 11 as desired.
  • the slots 32 in the base end portions 19 are aligned with the slots 20 in the base center portion 18, as will be apparent from FIG. 2.
  • Each rod member 27 of the antennas 25, 25 preferably consists of two or more slidably telescoped, extensible and retractable rod sections 27', 27", to that the length of the antennas 25, 26 may be adjusted. Also, while these antennas are normally vertical and are held so by tightening of the pivot means 28, the pivot means 28 may be loosened to permit the antennas 25, 26 to be moved to a folded, inoperative position on top of the base 17 to facilitate collapsing of the device into a compact form, when it is not in use.
  • the antennas 11, 25, 26 are longitudinally aligned in a common vertical plane extending diametrically of the mounting member 14, so that by simply rotating the base 17 about the member 14, the entire antenna device may be oriented in any direction for optimum transmission and/or reception of signals.
  • the center portion 18 of the base 17 is simply seated on the hexagonal bottom portion 14' of the member 14 so that it rotatably encompasses the member portion 14", with some clearance existingbetwene the base 17 and the vehicle top 15.
  • the active antenna rod 13 is electrically connected by a suitable conductor 33 to the transmitter and/or receiver (not shown), and a ground connection is provided for the base 17 and, consequently for the antennas 25, 26.
  • This ground connection consists of a pair of metal brushes 34 which are preferably flexibly resilient and are suitably secured, as at 35, to the vehicle top 15 at opposite sides of the mounting member 14.
  • the brushes 34 extend into the aperture 24 in the base portion 17 and electrically engage the base at the edge of the aperture to effect the desired ground.
  • An adjustable directional antenna comprising in combination, a support surface, a mounting member of insulating material installed on top of said support surface, a vertical active antenna rod projecting upwardly from said mounting member, a horizontally elongated base rotatably positioned on said mounting member and extending to diametrically opposite sides therefrom, a director antenna rod and a reflector antenna rod carried by opposite end portions of said base, and means adjustably mounting said director and reflector antenna rods on the base for movement thereof toward and away from said active antenna rod
  • said mounting member including a top portion having a circular cross sectional configuration in a transverse base plane therethrough, a pair of upright resilient metal members secured to said support surface adjacent to said mounting member at opposite ends of a diametric line through said mounting member; said base including a center portion having a centrally located circular aperture therein rotatably and detachably receiving said mounting member, said aperture being of sufficient diameter to clear said upper portion of said mounting means, but small enough so that the edge of said aperture is frictionally engaged by said metal members,
  • each of said director and reflector antenna rods includes a fastener mounted on an end portion of said base, and a rod member adjustably secured to said fastener and projecting upwardly therefrom, said rod member being movable to a folded position overlying and substantially parallel to said base.
  • each of said director and reflector antenna rods includes a rod member com rising a plurality of slidably telescoped extensible and retractable rod sections.

Landscapes

  • Aerials With Secondary Devices (AREA)

Description

May 1 1968 c. F. STROHMEYER, JR 3,383,694
ROTATABLE DIRECTIONAL ANTENNA ATTACHMENT FOR USE WITH A VERTICAL ANTENNA ROD FilSd Feb. 15, 1965 T 14 54 2/ 25 1 5- /6 n l /2Z 5 INVENTOR /9 Car/l F .Sfro/zmeyer, Jr
F T- BY ATTORNEY United States Patent 3,383,694 ROTATABLE DERECTIONAL ANTENNA ATTACH- llzigllgll FOR USE WITH A VERTECAL ANTENNA Carl] F. Strohmeyer, in, RED. 2, St. Pauls, N.C. 28384 Filed Feb. 15, 1965, Ser. No. 432,510 3 Claims. (Cl. 343-833) ABSTRAQT OF THE DISCLOSURE A directional antenna attachment for use with an installed vertical active antenna rod having an insulation mounting member at its lower end comprising a horizontally elongated metallic base provided intermediate its ends with an aperture for rotatable positioning of said base on the stated mounting member, a director antenna and a reflector antenna rod carried by opposite end portions of the base, and means adjustably mounting the director and reflector antenna rods on the base for movement thereof toward and away from the aperture. The base comprises a plurality of slidably connected and longitudinally extensible and retracted base portions. Both the director and reflector antenna rods include a plurality of slidably telescoped extensible and retractable rod sections.
This invention relates to new and useful improvements in directional antennas used for radio or similar purposes, and in particular the invention concerns itself with a directional antenna embodying a vertical active antenna rod together with director and reflector antenna rods carried by a horizontally elongated base at opposite sides of the active rod, the base being rotatable in a horizontal plane to permit the antenna to be oriented in a desired direction for optimum transmission and/or reception of signals.
The principal object of the invention is to provide a directional antenna of this type which is very simple in construction, highly efilcient in operation, which may be quickly and easily adjusted as to positional relationship between the director and reflector rods and the active rod, and which may be conveniently folded or collapsed into a compact form when it is not in use.
While the directional antenna of the invention has general utility, it is especially adapted for use in the environment of mobile antennas such as are commonly carried by automobiles or other vehicles. In such an environment, a conventional single active antenna already provided on the vehicle may be readily converted into a directional antenna by simply applying the director and reflector rods of the invention with their carrying base to the conventional active antenna to obtain the desired directional transmission and/or reception of signals.
Other objects and advantages of the invention will become apparent from the following description taken in conjunction with the accompanying drawings, wherein like characters of reference are used to designate like parts, and wherein:
FIGURE 1 is a side elevational view of the directional antenna of the invention;
FIGURE 2 is a top plan view thereof;
FIGURE 3 is an enlarged, fragmentary sectional view, taken substantially in the plane of the line 3-3 in FIG- URE 2; and
FIGURE 4 is a cross-sectional view, taken substantially in the plane of the line 4-4 in FIGURE 3.
Referring now to the accompanying drawings in detail, the directional antenna in accordance with the invention is designated generally by the reference numeral and embodies in its construction a conventional active antenna 11 and what may be referred to as a directional antenna attachment 12. The active antenna 11 is of the usual type including a vertical rod 13 provided at its lower end with a mounting member 14 of insulating material, the member 14 being suitably secured to supporting structure, as for example, to the top of a vehicle indicated by the dotted lines 15. The mounting member 14 includes the usual hexagonal bottom portion 14' and a substantially semi-spherical upper portion 14 (see FIG. 3), the upper portion 14 being equipped with a metallic socket 16 in which the lower end of the rod 13 is secured.
The directional antenna attachment 12 of the invention comprises a metallic, horizontally elongated base 17, including an inverted channel-shaped center portion 18 and a pair of strap-like end portions 19 which are slidably telescoped in the ends of the center portion, as will be clearly apparent from FIGS. 3 and 4. The ends of the center portion 18 are provided with longitudinal, openended slots 20 to adjustably receive bolts 21 carried by the inner ends of the end portions 19, so that by sliding the portions 18, 19 of the base together or apart, the overall length of the base may be varied. Suitable washers 22 and nuts 23 are provided on the bolts 21 for locking the base portions in a desired adjusted position.
The base center portion 18 is provided with a central opening or aperture 24 for rotatable reception of the upper portion 14" of the aforementioned mounting member 14, whereby the entire base 17 may be manually rotated about the member 14 in a horizontal plane, it being noted that the base projects diametrically to opposite directions from the member 14, as shown.
The respective end portions 19, 19 of the base 17 carry a director antenna rod 25 and a reflector antenna rod 26 which are identical in construction and each comprises a rod member 27 pivotally secured at its lower end as at 28 to a fastener 29, the latter including a socket 30 similar to the aforementioned socket 16 and a bolt, nut and washer assembly 31 for fastening the socket 30 to the associated end portion 19 of the base 17.
The base end portions 19 are provided with longitudinal, open-ended slots 32 which adjustably receive the bolt assemblies 31 so that the director antenna 25 and the reflector antenna 26 may be moved toward or away from the active antenna 11 as desired. The slots 32 in the base end portions 19 are aligned with the slots 20 in the base center portion 18, as will be apparent from FIG. 2.
Each rod member 27 of the antennas 25, 25 preferably consists of two or more slidably telescoped, extensible and retractable rod sections 27', 27", to that the length of the antennas 25, 26 may be adjusted. Also, while these antennas are normally vertical and are held so by tightening of the pivot means 28, the pivot means 28 may be loosened to permit the antennas 25, 26 to be moved to a folded, inoperative position on top of the base 17 to facilitate collapsing of the device into a compact form, when it is not in use.
In use, the antennas 11, 25, 26 are longitudinally aligned in a common vertical plane extending diametrically of the mounting member 14, so that by simply rotating the base 17 about the member 14, the entire antenna device may be oriented in any direction for optimum transmission and/or reception of signals. The center portion 18 of the base 17 is simply seated on the hexagonal bottom portion 14' of the member 14 so that it rotatably encompasses the member portion 14", with some clearance existingbetwene the base 17 and the vehicle top 15.
The active antenna rod 13 is electrically connected by a suitable conductor 33 to the transmitter and/or receiver (not shown), and a ground connection is provided for the base 17 and, consequently for the antennas 25, 26. This ground connection consists of a pair of metal brushes 34 which are preferably flexibly resilient and are suitably secured, as at 35, to the vehicle top 15 at opposite sides of the mounting member 14. The brushes 34 extend into the aperture 24 in the base portion 17 and electrically engage the base at the edge of the aperture to effect the desired ground.
While in the foregoing there has been described and shown the preferred embodiment of the invention, various modifications and equivalents may become apparent to those skilled in the art to which the invention relates. Accordingly, it is not desired to limit the invention to this disclosure and various modifications and equivalents may be resorted to, falling within the spirit and scope of the invention as claimed.
What is claimed as new is:
1. An adjustable directional antenna comprising in combination, a support surface, a mounting member of insulating material installed on top of said support surface, a vertical active antenna rod projecting upwardly from said mounting member, a horizontally elongated base rotatably positioned on said mounting member and extending to diametrically opposite sides therefrom, a director antenna rod and a reflector antenna rod carried by opposite end portions of said base, and means adjustably mounting said director and reflector antenna rods on the base for movement thereof toward and away from said active antenna rod said mounting member including a top portion having a circular cross sectional configuration in a transverse base plane therethrough, a pair of upright resilient metal members secured to said support surface adjacent to said mounting member at opposite ends of a diametric line through said mounting member; said base including a center portion having a centrally located circular aperture therein rotatably and detachably receiving said mounting member, said aperture being of sufficient diameter to clear said upper portion of said mounting means, but small enough so that the edge of said aperture is frictionally engaged by said metal members, a pair of end portions carrying said director and reflector antenna rods respectively, and adjustable means securing said end portions to said center portion whereby the over all length of said base may be varied.
2. The device as defined in claim 1 wherein each of said director and reflector antenna rods includes a fastener mounted on an end portion of said base, and a rod member adjustably secured to said fastener and projecting upwardly therefrom, said rod member being movable to a folded position overlying and substantially parallel to said base.
3. The device as defined in claim 1 wherein each of said director and reflector antenna rods includes a rod member com rising a plurality of slidably telescoped extensible and retractable rod sections.
References Cited UNITED STATES PATENTS 2,218707 10/1940 Franz 3437l5 X 2,243,523 5/1941 Davis 343--833 X 2,248,335 7/1941 Burkhart 343833 X 2,473,421 6/1949 Fubini et al. 343-761 2,497,687 2/1950 Pickett et al. 343-882 2,753,557 7/1956 Middlemark 343-882 X HERMAN KARL SAALBACH, Primary Examiner.
PAUL L. GENSLER, Examiner.
US432510A 1965-02-15 1965-02-15 Rotatable directional antenna attachment for use with a vertical antenna rod Expired - Lifetime US3383694A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US432510A US3383694A (en) 1965-02-15 1965-02-15 Rotatable directional antenna attachment for use with a vertical antenna rod

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US432510A US3383694A (en) 1965-02-15 1965-02-15 Rotatable directional antenna attachment for use with a vertical antenna rod

Publications (1)

Publication Number Publication Date
US3383694A true US3383694A (en) 1968-05-14

Family

ID=23716461

Family Applications (1)

Application Number Title Priority Date Filing Date
US432510A Expired - Lifetime US3383694A (en) 1965-02-15 1965-02-15 Rotatable directional antenna attachment for use with a vertical antenna rod

Country Status (1)

Country Link
US (1) US3383694A (en)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3895366A (en) * 1974-03-18 1975-07-15 Francis E Morris Golf swing sensing device
US4028709A (en) * 1975-09-10 1977-06-07 The United States Of America As Represented By The Field Operations Bureau Of The Federal Communications Commission Adjustable yagi antenna
JPS52126730U (en) * 1976-03-23 1977-09-27
EP0053512A1 (en) * 1980-12-03 1982-06-09 The Marconi Company Limited Secondary radar antenna
US4403903A (en) * 1978-11-20 1983-09-13 Cary Arthur P Extension member for surrogate forks for a fork lift truck
US4647243A (en) * 1982-05-28 1987-03-03 Deere & Company Twine wrapping mechanism for a large round baler
US4743133A (en) * 1982-09-30 1988-05-10 General Electric Company Inked ribbon cartridge
US4753410A (en) * 1987-06-01 1988-06-28 Dyer William B Side view mirror extension
US5767807A (en) * 1996-06-05 1998-06-16 International Business Machines Corporation Communication system and methods utilizing a reactively controlled directive array
US6496152B2 (en) * 2000-03-10 2002-12-17 Jack Nilsson Dual polarized antenna
US20040164918A1 (en) * 2002-11-14 2004-08-26 Wifi-Plus, Inc. Apparatus and method for a multi-polarized antenna
US20040164920A1 (en) * 2002-11-14 2004-08-26 Wifi-Plus, Inc. Multi-polarized feeds for dish antennas
US20040164917A1 (en) * 2000-03-10 2004-08-26 Wifi-Plus, Inc. Compact multi-polarized antenna for portable devices
US20040164919A1 (en) * 2002-11-14 2004-08-26 Wifi-Plus, Inc. Apparatus and method for a multi-polarized ground plane beam antenna
US20090040123A1 (en) * 2007-08-07 2009-02-12 Electronics And Telecommunications Research Institute Frequency reconfiguration array antenna and array distance control method
EP2274780A1 (en) * 2008-03-27 2011-01-19 Microwave Mitigation and Detection ("MMAD") Receiver interference protection and direction finding antenna system
FR2983358A1 (en) * 2011-11-30 2013-05-31 Alcatel Lucent ANTENNA COMPRISING A TUNABLE NETWORK OF RADIANT ELEMENTS
US10446901B1 (en) 2018-10-16 2019-10-15 Science Applications International Corporation System and method for guarding an antenna from interfering physical objects
WO2020081063A1 (en) * 2018-10-16 2020-04-23 Science Applications International Corporation System and method for guarding an antenna from interfering physical objects

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2218707A (en) * 1936-12-22 1940-10-22 Telefunken Gmbh Antenna array
US2243523A (en) * 1938-06-06 1941-05-27 Paul H Davis Method of radio communication
US2248335A (en) * 1939-11-28 1941-07-08 Burkhart William Shearman Radio beam antenna and control means therefor
US2473421A (en) * 1945-05-30 1949-06-14 Fubini Eugene Search antenna array
US2497687A (en) * 1946-08-30 1950-02-14 K L G Sparking Plugs Ltd Radio aerial for use on vehicles
US2753557A (en) * 1955-11-08 1956-07-03 Marvin P Middlemark Indoor television antennas

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2218707A (en) * 1936-12-22 1940-10-22 Telefunken Gmbh Antenna array
US2243523A (en) * 1938-06-06 1941-05-27 Paul H Davis Method of radio communication
US2248335A (en) * 1939-11-28 1941-07-08 Burkhart William Shearman Radio beam antenna and control means therefor
US2473421A (en) * 1945-05-30 1949-06-14 Fubini Eugene Search antenna array
US2497687A (en) * 1946-08-30 1950-02-14 K L G Sparking Plugs Ltd Radio aerial for use on vehicles
US2753557A (en) * 1955-11-08 1956-07-03 Marvin P Middlemark Indoor television antennas

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3895366A (en) * 1974-03-18 1975-07-15 Francis E Morris Golf swing sensing device
US4028709A (en) * 1975-09-10 1977-06-07 The United States Of America As Represented By The Field Operations Bureau Of The Federal Communications Commission Adjustable yagi antenna
JPS52126730U (en) * 1976-03-23 1977-09-27
JPS5745681Y2 (en) * 1976-03-23 1982-10-08
US4403903A (en) * 1978-11-20 1983-09-13 Cary Arthur P Extension member for surrogate forks for a fork lift truck
EP0053512A1 (en) * 1980-12-03 1982-06-09 The Marconi Company Limited Secondary radar antenna
US4647243A (en) * 1982-05-28 1987-03-03 Deere & Company Twine wrapping mechanism for a large round baler
US4743133A (en) * 1982-09-30 1988-05-10 General Electric Company Inked ribbon cartridge
US4753410A (en) * 1987-06-01 1988-06-28 Dyer William B Side view mirror extension
US5767807A (en) * 1996-06-05 1998-06-16 International Business Machines Corporation Communication system and methods utilizing a reactively controlled directive array
US6496152B2 (en) * 2000-03-10 2002-12-17 Jack Nilsson Dual polarized antenna
US7348933B2 (en) 2000-03-10 2008-03-25 Wifi Plus, Inc. Compact multi-polarized antenna for portable devices
US20040164917A1 (en) * 2000-03-10 2004-08-26 Wifi-Plus, Inc. Compact multi-polarized antenna for portable devices
US20040164920A1 (en) * 2002-11-14 2004-08-26 Wifi-Plus, Inc. Multi-polarized feeds for dish antennas
US20040164919A1 (en) * 2002-11-14 2004-08-26 Wifi-Plus, Inc. Apparatus and method for a multi-polarized ground plane beam antenna
US7030831B2 (en) 2002-11-14 2006-04-18 Wifi-Plus, Inc. Multi-polarized feeds for dish antennas
US7138956B2 (en) 2002-11-14 2006-11-21 Wifi-Plus, Inc. Apparatus and method for a multi-polarized ground plane beam antenna
US20040164918A1 (en) * 2002-11-14 2004-08-26 Wifi-Plus, Inc. Apparatus and method for a multi-polarized antenna
US20090040123A1 (en) * 2007-08-07 2009-02-12 Electronics And Telecommunications Research Institute Frequency reconfiguration array antenna and array distance control method
US7868846B2 (en) * 2007-08-07 2011-01-11 Electronics And Telecommunications Research Institute Frequency reconfiguration array antenna and array distance control method
EP2274780A1 (en) * 2008-03-27 2011-01-19 Microwave Mitigation and Detection ("MMAD") Receiver interference protection and direction finding antenna system
EP2274780A4 (en) * 2008-03-27 2012-10-24 Microwave Mitigation And Detection Mmad Receiver interference protection and direction finding antenna system
FR2983358A1 (en) * 2011-11-30 2013-05-31 Alcatel Lucent ANTENNA COMPRISING A TUNABLE NETWORK OF RADIANT ELEMENTS
WO2013079552A1 (en) * 2011-11-30 2013-06-06 Alcatel Lucent Antenna comprising a tunable array of radiating elements
US10446901B1 (en) 2018-10-16 2019-10-15 Science Applications International Corporation System and method for guarding an antenna from interfering physical objects
WO2020081063A1 (en) * 2018-10-16 2020-04-23 Science Applications International Corporation System and method for guarding an antenna from interfering physical objects

Similar Documents

Publication Publication Date Title
US3383694A (en) Rotatable directional antenna attachment for use with a vertical antenna rod
US4028709A (en) Adjustable yagi antenna
US3579241A (en) Telescoping rod antenna with hinged joint at a medial section
US4598297A (en) Mounting apparatus for satellite dish antennas
JPS6269704A (en) Window antenna for automobile
US3886560A (en) Antenna swivel mount
US2505751A (en) Broad band antenna
US2496646A (en) Television antenna
US3624662A (en) Mobile deflectable antenna with impedance matching
US3860932A (en) Television antenna for motor home with collapsible support
US2582159A (en) Universally adjustable antenna
US3268897A (en) Citizen's band radio antenna
CA1205555A (en) Flexible broadband uhf antenna
US2536053A (en) Automobile antenna
US3158866A (en) Universally adjustable antenna support
US3408652A (en) Aerial mount
US4152704A (en) Rodholder mounted antenna
US4038661A (en) Tuning loop for attachment to a citizens band radio antenna
US2980376A (en) Self-supporting tripod mast
GB1596268A (en) Clamps
US2819463A (en) Variable angle conical antenna
US4208662A (en) Omnidirectional, vertically polarized antenna
US3605102A (en) Directable multiband antenna
US3864686A (en) Roof mounted vehicle antenna
US3745581A (en) Dual band folding antenna