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

Info

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
Authority
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
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)
Original Assignee
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

Links

Images

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.

Abstract

A horizontal rooftop antenna is adapted to be mounted on rolling stock or a highway truck. It is in the form of an end fed shunttype closed loop radiator tuned to frequencies between 2 and 30 MHz.

Description

Umtd States Patent 1 91 1 11 3,725,940 Siple 1451 Apr. 3, 1973 [54] HORIZONTAL VEHICLE MOUNTED OMNIDIRECTIONAL LOOP ANTENNA [56] References Cited HAVING A SHORTING STUB UNITED STATES PATENTS [75] Inventor: Ralph J. Siple, Idaho Falls, Idaho 2,22l,939 11/1940 Bennett ..343/744 [73] Assignee: The United States of America 88 3,299,428 1/1967 Tessari ..343/743 represented by the United States Atomic Energy Commission Primary Examiner-Eli Lieberman [22] Filed; 8, 1972 Attorney-Roland A. Anderson 1 pp NW 224,490 57 ABSTRACT 1 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,
1 343/748; 882 5 Claims, 4 Drawing Figures 26 28 LINE TUNER 2 ANTENNA 1.001
VEHICLE ROOF GROUND PLANE/ HORIZONTAL VEHICLE MOUNTED OMNIDIRECTIONAL LOOP ANTENNA HAVING A SHORTING STUB BACKGROUND OF THE INVENTION There exists a need for a radiating antenna designed for installation on the top of a semi-trailer truck having a transmitter. In portions of the radio spectrum, difficulties are encountered in mounting antennae on vehicles because of the vertical height necessary to achieve efficiency. To overcome the difficulties, varioushorizontally polarized antennae have been tried. It has been determined that inches above the trailer roof is the maximum height allowable to permit the vehicle to pass under bridges, underpasses, etc. An antenna mounted by means of suction cups has been tried and discarded as impractical. In order to have the antenna sturdily mounted yet avoid the possibility of collisions with overpasses or the like, a construction using a hinged support has proved to be the most satisfactory. The entire antenna can then be raised or lowered as the road conditions require. For rolling stock, the horizontal antenna need not be mounted to be raised and lowered.
SUMMARY OF THE INVENTION 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.
It is an object of this invention to provide an improved mobile antenna for horizontal mounting on a vehicle roof. It is a further object of this invention to provide an improved retractile roof-mounted antenna controlled remotely by air pressure. It is also an object of the present invention to provide an improved radiating antenna for a mobile transmitter.
BRIEF DESCRIPTION OF THE DRAWINGS DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawings, there is shown in FIG.
1 an embodiment of the present invention to be mounted on a mobile vehicle. 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. As
shown in FIG. 2, 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,
from the feedpoint, 30, joins the stub to the first side. An antenna loop design which performs very well has distance E 5 in.
distance G 10 in.
In the embodiment of FIG. 3, 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.
It has been found that an antenna positioned a distance of 15 inches above the vehicle reflector surface provides the best performance. It has also been' found that the position of the shorting stub at about 10 inches from the feedpoint provides the best radiation of the transmitter signal.
The same configuration described above has been used on rolling stock with excellent results. On a railroad car, however, 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,
an outer conductor of the coaxial cable being connected to the vehicle roof which constitutes a reflecting ground plane,
a second end of said loop having a conductive stub connected thereto spaced parallel to and at a short distance from the first loop side,
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,
and an insulating supporting structure attached to the vehicle roof and to the antenna loop in the vicinity of the four corners of the loop,
the supporting structure holding the antenna loop in a horizontal position at a distance above the vehicle roof.
2. The radiating antenna structure of claim 1 wherein the loop is made of stainless steel tubing and the supporting structure is made of polyvinyl chloride tubing.
3. 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.
4. The radiating antenna structure of claim 3 wherein a hydraulic cylinder having a remote control operates to raise and lower the supporting structure.
5. The radiating antenna structure of claim 1 wherein the loop is supported at a distance of about 15 inches above the vehicle roof. I

Claims (5)

1. An end fed shunt-type radiating antenna adapted to be mounted on a vehicle roof comprising: a continuous generally rectangular open ended conductive loop, a first end of said loop being the feedpoint and connected to receive a transmitter signal through an inner conductor of a coaxial cable, an outer conductor of the coaxial cable being connected to the vehicle roof which constitutes a reflecting ground plane, a second end of said loop having a conductive stub connected thereto spaced parallel to and at a short distance from the first loop side, a conductive shorting stub positioned at substantially right angles to and joining the first side and the conductive stub at a distance from the feedpoint serving to close the loop, and an insulating supporting structure attached to the vehicle roof and to the antenna loop in the vicinity of the four corners of the loop, the supporting structure holding the antenna loop in a horizontal position at a distance above the vehicle roof.
2. The radiating antenna structure of claim 1 wherein the loop is made of stainless steel tubing and the supporting structure is made of polyvinyl chloride tubing.
3. 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.
4. The radiating antenna structure of claim 3 wherein a hydraulic cylinder Having a remote control operates to raise and lower the supporting structure.
5. The radiating antenna structure of claim 1 wherein the loop is supported at a distance of about 15 inches above the vehicle roof.
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 (en)
JP (1) JPS4889656A (en)
AU (1) AU5159273A (en)
BE (1) BE794982A (en)
CA (1) CA964734A (en)
DE (1) DE2306202A1 (en)
FR (1) FR2171269B3 (en)
GB (1) GB1359981A (en)
NL (1) NL7301703A (en)

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 (en) * 1992-08-28 1994-03-02 Philips Electronics Uk Limited Loop antenna
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 (en) * 1992-08-28 1994-03-02 Philips Electronics Uk Limited Loop antenna
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
FR2171269B3 (en) 1976-02-06
DE2306202A1 (en) 1973-08-23
CA964734A (en) 1975-03-18
GB1359981A (en) 1974-07-17
FR2171269A1 (en) 1973-09-21
JPS4889656A (en) 1973-11-22
BE794982A (en) 1973-05-29
NL7301703A (en) 1973-08-10
AU5159273A (en) 1974-08-01

Similar Documents

Publication Publication Date Title
EP0278069B1 (en) Near-isotropic low profile microstrip radiator especially suited for use as a mobile vehicle antenna
US3523251A (en) Antenna structure with an integrated amplifier responsive to signals of varied polarization
US4764773A (en) Mobile antenna and through-the-glass impedance matched feed system
EP0348054A2 (en) Mobile communications antenna
EP0407145B1 (en) Broad band mobile telephone antenna
US2026652A (en) High frequency transmitter
CA2032650A1 (en) Multiband antenna
GB1446999A (en) Radio antenna systems
US3725940A (en) Horizontal vehicle mounted omnidirectional loop antenna having a shorting stub
US5343214A (en) Cellular mobile communications antenna
JPH0730316A (en) Dual purpose antena of low profile
CA1223339A (en) Cellular mobile communications antenna
JPS62173801A (en) Automobile antenna for multiband transmission and receiving of am-fm cell type telephone
US4101897A (en) C.b. radio antenna unit system and process
US2272312A (en) Radio relaying
US4751514A (en) Multi-frequency vehicular antenna system
US6496152B2 (en) Dual polarized antenna
US9899730B2 (en) Broadband antenna in the crash pad for vehicle
US5748154A (en) Miniature antenna for portable radio communication equipment
JP2756672B2 (en) Multi-frequency antenna
US2158875A (en) Antenna system
US20030122719A1 (en) Tri-element antenna with dish
US3864686A (en) Roof mounted vehicle antenna
WO2000069021A1 (en) Concealed radio antenna system
US6064347A (en) Dual frequency, low profile antenna for low earth orbit satellite communications