US3725940A - Horizontal vehicle mounted omnidirectional loop antenna having a shorting stub - Google Patents

Horizontal vehicle mounted omnidirectional loop antenna having a shorting stub Download PDF

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Publication number
US3725940A
US3725940A US00224490A US3725940DA US3725940A US 3725940 A US3725940 A US 3725940A US 00224490 A US00224490 A US 00224490A US 3725940D A US3725940D A US 3725940DA US 3725940 A US3725940 A US 3725940A
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US
United States
Prior art keywords
loop
antenna
supporting structure
vehicle roof
distance
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
US00224490A
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English (en)
Inventor
R Siple
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.)
US Atomic Energy Commission (AEC)
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US Atomic Energy Commission (AEC)
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 US Atomic Energy Commission (AEC) filed Critical US Atomic Energy Commission (AEC)
Application granted granted Critical
Publication of US3725940A publication Critical patent/US3725940A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H01Q7/02—Collapsible antennas; Retractable antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H01Q1/325—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
    • H01Q1/3275—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk

Definitions

  • a horizontal rooftop antenna is adapted to be [52] 0.8. CI. 343/713, 343/743, 343/748, mounted on rolling stock or a highway truck. It is in 343/882 the form of an end fed shunt-type closed loop radiator [51] Int. Cl. ..H0lq 1/32 tuned to frequencies between 2 and 30 MHZ [58] Field of Search ..343/71l,-7l3, 741, 743, 744,
  • the present invention comprises a mobile horizontal rooftop antenna which may be used on highway vehicles or rolling stock. It has been found that an antenna .in the form of a horizontally mounted stainless steel a line tuning network for a necessary impedance match to a transmitter.
  • the antenna structure can be either rigidly mounted or made to be retractile.
  • a horizontal metal section of the vehicle roof indicated at 10 serves as an electrical ground plane.
  • the antenna, 12, is shaped in the fonn of a rectangle and is supported above the ground plane, 10.
  • a coaxial cable, 14, has the inner conductor, 16, connected to the antenna, 12.
  • the outer shield, 18, is fastened to the metal surface, 10, with a terminal conductor.
  • the coaxial cable, 14, will vary from 20 to 30 feet in length depending on the installation.
  • a line tuning network, 20, having a variable capacitor, 22, and variable inductor, 24, is connected to the coaxial cable, 14, and to a transmitter, 26, by means of a lead-in line in the form of coaxial cable, 28.
  • An RF signal is fed from the transmitter, 26, into the variable inductor, 24, which varies from 0-10 microhenries, through the variable capacitor, 22, which varies between 12 and 202 micro micro farads and through the coaxial cable, 14, to the antenna feedpoint, 30.
  • the gain of the antenna is approximately 8 db.
  • the antenna structure itself may be made from three-eighths inch stainless steel or copper tubing.
  • the antenna loop can be made up'of two long sides, designated A, and two shorter sides, B and C.
  • a stainless steel stub, D is attached at a distance, E, from the first side of the loop and parallel to it.
  • a shorting stub, F connected at a distance, G,
  • An antenna loop design which performs very well has distance E 5 in.
  • a polyvinyl chloride plastic pipe supporting structure, 32, for the antenna, 12, is depicted.
  • the plastic supporting structure, 32 has a series of legs, 34, with a crossbar, 36, joining the legs in pairs as shown.
  • the legs, 34, are hinged, 38, at the bottom to the vehicle roof so that the entire antenna may be retracted.
  • a chain, 40 may be used to connect adjacent vcrossbar-s, 36.
  • the hinged supporting structure, 32 may be raised and lowered by means of a hydraulic cylinder, 42, as shown in FIG. 4.
  • the cylinder, 42 may be mounted on top of the vehicle along with the antenna and supporting structure. Air can be supplied from the vehicle air supply that is used for the vehicles air brakes. The antenna then mayv be raised or lowered by remote control at the drivers discretion.
  • the supporting structure need not a first end of said loop being the feedpoint and connected to receive a transmitter signal through an inner conductor of a coaxial cable,
  • a conductive shorting stub positioned at substantially right angles to and joiningthe first side and the conductive stub at a distance from the feedpoint serving to close the loop
  • the supporting structure holding the antenna loop in a horizontal position at a distance above the vehicle roof.
  • the radiating antenna structure of claim 2 wherein the supporting structure is hinged to the top of the vehicle so that the antenna structure may be raised and lowered.

Landscapes

  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Details Of Aerials (AREA)
US00224490A 1972-02-08 1972-02-08 Horizontal vehicle mounted omnidirectional loop antenna having a shorting stub Expired - Lifetime US3725940A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US22449072A 1972-02-08 1972-02-08

Publications (1)

Publication Number Publication Date
US3725940A true US3725940A (en) 1973-04-03

Family

ID=22840935

Family Applications (1)

Application Number Title Priority Date Filing Date
US00224490A Expired - Lifetime US3725940A (en) 1972-02-08 1972-02-08 Horizontal vehicle mounted omnidirectional loop antenna having a shorting stub

Country Status (9)

Country Link
US (1) US3725940A (de)
JP (1) JPS4889656A (de)
AU (1) AU5159273A (de)
BE (1) BE794982A (de)
CA (1) CA964734A (de)
DE (1) DE2306202A1 (de)
FR (1) FR2171269B3 (de)
GB (1) GB1359981A (de)
NL (1) NL7301703A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5019830A (en) * 1989-03-13 1991-05-28 Harada Kogyo Kabushiki Kaisha Amplified FM antenna with parallel radiator and ground plane
EP0584882A1 (de) * 1992-08-28 1994-03-02 Philips Electronics Uk Limited Rahmenantenne
US5686903A (en) * 1995-05-19 1997-11-11 Prince Corporation Trainable RF transceiver
US5699054A (en) * 1995-05-19 1997-12-16 Prince Corporation Trainable transceiver including a dynamically tunable antenna
US20040169613A1 (en) * 2003-02-27 2004-09-02 Mark Krier Optimized capacitive dipole antenna
US20040169614A1 (en) * 2003-02-27 2004-09-02 Laurent Desclos Capacitively loaded dipole antenna optimized for size
US6943740B1 (en) 2001-04-26 2005-09-13 Arthur Garabedian Methods and systems for concealing antennas
WO2004057698A3 (en) * 2002-12-17 2006-06-29 Ethertroncs Inc Antennas with reduced space and improved performance

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2221939A (en) * 1937-11-03 1940-11-19 Bendix Radio Corp Radio signaling system
US3299428A (en) * 1964-09-11 1967-01-17 Iii Lawrence P Tessari Horizontal semienclosed loop with conductive ground plane, having vertical whip extening from within loop enclosure

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2221939A (en) * 1937-11-03 1940-11-19 Bendix Radio Corp Radio signaling system
US3299428A (en) * 1964-09-11 1967-01-17 Iii Lawrence P Tessari Horizontal semienclosed loop with conductive ground plane, having vertical whip extening from within loop enclosure

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5019830A (en) * 1989-03-13 1991-05-28 Harada Kogyo Kabushiki Kaisha Amplified FM antenna with parallel radiator and ground plane
EP0584882A1 (de) * 1992-08-28 1994-03-02 Philips Electronics Uk Limited Rahmenantenne
US5422650A (en) * 1992-08-28 1995-06-06 U.S. Philips Corporation Loop antenna with series resonant circuit and parallel reactance providing dual resonant frequencies
US5686903A (en) * 1995-05-19 1997-11-11 Prince Corporation Trainable RF transceiver
US5699054A (en) * 1995-05-19 1997-12-16 Prince Corporation Trainable transceiver including a dynamically tunable antenna
US6943740B1 (en) 2001-04-26 2005-09-13 Arthur Garabedian Methods and systems for concealing antennas
WO2004057698A3 (en) * 2002-12-17 2006-06-29 Ethertroncs Inc Antennas with reduced space and improved performance
US20040169613A1 (en) * 2003-02-27 2004-09-02 Mark Krier Optimized capacitive dipole antenna
US20040169614A1 (en) * 2003-02-27 2004-09-02 Laurent Desclos Capacitively loaded dipole antenna optimized for size
US7616164B2 (en) 2003-02-27 2009-11-10 Ethertronics, Inc. Optimized capacitive dipole antenna
US20100033394A1 (en) * 2003-02-27 2010-02-11 Mark Krier Optimized capacitive dipole antenna
US8059047B2 (en) * 2003-02-27 2011-11-15 Ethertronics, Inc. Capacitively loaded dipole antenna optimized for size

Also Published As

Publication number Publication date
DE2306202A1 (de) 1973-08-23
NL7301703A (de) 1973-08-10
CA964734A (en) 1975-03-18
FR2171269B3 (de) 1976-02-06
BE794982A (fr) 1973-05-29
JPS4889656A (de) 1973-11-22
GB1359981A (en) 1974-07-17
FR2171269A1 (de) 1973-09-21
AU5159273A (en) 1974-08-01

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