US3263233A - Directive helical antenna having integral balun-feed - Google Patents

Directive helical antenna having integral balun-feed Download PDF

Info

Publication number
US3263233A
US3263233A US278281A US27828163A US3263233A US 3263233 A US3263233 A US 3263233A US 278281 A US278281 A US 278281A US 27828163 A US27828163 A US 27828163A US 3263233 A US3263233 A US 3263233A
Authority
US
United States
Prior art keywords
antenna
directive
feed
line
helical antenna
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
US278281A
Inventor
Spitz Erich
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.)
Thales SA
Original Assignee
CSF Compagnie Generale de Telegraphie sans Fil SA
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 CSF Compagnie Generale de Telegraphie sans Fil SA filed Critical CSF Compagnie Generale de Telegraphie sans Fil SA
Application granted granted Critical
Publication of US3263233A publication Critical patent/US3263233A/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
    • H01Q11/00—Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
    • H01Q11/02—Non-resonant antennas, e.g. travelling-wave antenna
    • H01Q11/08—Helical antennas

Definitions

  • Directive antennas comprising a two-wire line about which a helix-shaped metal conductor is wound.
  • the antenna according to the invention presents the following remarkable features:
  • the antenna is excited by a transmission line, the outer conductor of which constitutes one of the elements of the antenna itself, coupling means being provided between this transmission line and the remainder of the antenna.
  • the antenna comprises a reflector through which extends the transmission line.
  • the antenna comprises of a two-wire line, comprising elements 1 and 2.
  • This line is surrounded by a metal helix 3.
  • Element 1 is the external conductor of a coaxial line, which is excited at one end by a source 7.
  • the inner conductor 6 terminates at the opposite end by a junction element 5, which is, for example, welded to element 2.
  • the coaxial line 1-6 extends through a reflector 4 and oscillator 7 is positioned at the other side thereof.
  • the operation of the antenna is as follows:
  • Oscillator 7 feeds, through the coaxial line 1-6, the junction element 5 which excites the two-wire line 1-2.
  • the antenna may also operate as a receiver antenna.
  • a directive antenna comprising: a two-wire line including two wires; a helix wound around said line; a coaxial line having an outer and an inner conductor and two ends, said outer conductor serving as one of said wires; an ultra-high frequency source coupled to one of said ends; and means coupling said inner conductor to the other wire.
  • a directive antenna comprising: a two-wire line including two wires; a helix wound around said line; a coaxial line having an outer and an inner conductor and two ends; said outer conductor serving as one of said wires; an ultra-high frequency source coupled to one of said ends; means coupling said inner conductor to the other wire; and a reflector positioned at said one end.

Description

July 26, 1966 E. SPlTZ 3,263,233
DIRECTIVE HELICAL ANTENNA HAVING INTEGRAL BALUN-FEED Filed May 6. 1965 United States Patent 3,263,233 DIRECTIVE HELICAL ANTENNA HAVING INTEGRAL BALUN-FEED Erich Spitz, Paris, France, assignor to CSF-Compagnie Generaie de Telegraphic Sans Fil, a corporation of France Filed May 6, 1963, Ser. No. 278,281 Claims priority, application France, May 7, 1962, 896,631 2 Claims. (Cl. 343-895) The present invention relates to directive antennas.
Directive antennas are known comprising a two-wire line about which a helix-shaped metal conductor is wound.
The width 0 of the radiation lobe 3 db below the maximum of such an antenna is given by the relation where L is the length of the antenna and A the operating wave length. For an angle 6 of 20, L=10 For a frequency of 400 mc./s., i.e. for 1:0.75 m., the length of the antenna is 7.50 m.
Such a length is not acceptable under certain conditions.
It is an object of the invention to provide an antenna of the above type, having a reduced length and the same performance.
The antenna according to the invention presents the following remarkable features:
(a) The antenna is excited by a transmission line, the outer conductor of which constitutes one of the elements of the antenna itself, coupling means being provided between this transmission line and the remainder of the antenna.
(b) The antenna comprises a reflector through which extends the transmission line. I
The invention will be best understood from the followign description and appended drawing, the only figure of which shows diagrammatically an embodiment of the antenna.
The antenna comprises of a two-wire line, comprising elements 1 and 2.
This line is surrounded by a metal helix 3.
Element 1 is the external conductor of a coaxial line, which is excited at one end by a source 7. The inner conductor 6 terminates at the opposite end by a junction element 5, which is, for example, welded to element 2. The coaxial line 1-6 extends through a reflector 4 and oscillator 7 is positioned at the other side thereof.
The operation of the antenna is as follows:
Oscillator 7 feeds, through the coaxial line 1-6, the junction element 5 which excites the two-wire line 1-2.
The effect is the same as if oscillator 7 were located at 5. The antenna built up by the two wire line 1-2 and the helix 3, is then excited.
On account of the presence of reflector 4, it operates as an antenna which would have a double length.
Of course, the antenna may also operate as a receiver antenna.
The antenna according to the invention presents the following advantages:
(a) Its length is reduced by half as compared to known antennas of this type. It may be used in commercial television as a receiver antenna on the roof of a building. For a frequency of 400 mc./s., its length is 5A=3.75 m.
(b) No symmetrical-dissymmetrical transformers are required, which are expensive and reduce the pass-band.
Of course, the invention is not limited to the embodiment shown which is given solely by way of example.
What is claimed, is:
1. A directive antenna comprising: a two-wire line including two wires; a helix wound around said line; a coaxial line having an outer and an inner conductor and two ends, said outer conductor serving as one of said wires; an ultra-high frequency source coupled to one of said ends; and means coupling said inner conductor to the other wire.
2. A directive antenna comprising: a two-wire line including two wires; a helix wound around said line; a coaxial line having an outer and an inner conductor and two ends; said outer conductor serving as one of said wires; an ultra-high frequency source coupled to one of said ends; means coupling said inner conductor to the other wire; and a reflector positioned at said one end.
References Cited by the Examiner UNITED STATES PATENTS 2,945,227 7/1960 Broussaud 343-895 X 3,113,316 12/1963 Berry 343792.5
OTHER REFERENCES Kraus: Antennas, McGraw Hill, N.Y., 1950, page 314.
Forbes: An Endfire Array Continuously Proximity- Coupled, AFCRC-TR-59-368, December 1959, page iii, 1, 2.
Sodaro: Helical Antenna Design, Radio-Electronic Engineering, February 1954, page 40.
HERMAN KARL SAALBACH, Primary Examiner.
P. L. GENSLER, Assistant Examiner.

Claims (1)

1. A DIRECTIVE ANTENNA COMPRISING: A TWO-WIRE LINE INCLUDING TWO WIRES; A HELIX WOUND AROUND SAID LINE; A COAXIAL LINE HAVING AN OUTER AND AN INNER CONDUCTOR AND TWO ENDS, SAID OUTER CONDUCTOR SERVING AS ONE OF SAID WIRES; AN ULTRA-HIGH FREQUENCY SOURCE COUPLED TO ONE OF SAID ENDS; AND MEANS FREQUENCY SOURCE COUPLED TO ONE OF SAID OTHER WISE.
US278281A 1962-05-07 1963-05-06 Directive helical antenna having integral balun-feed Expired - Lifetime US3263233A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR896631A FR1330197A (en) 1962-05-07 1962-05-07 New directive antenna

Publications (1)

Publication Number Publication Date
US3263233A true US3263233A (en) 1966-07-26

Family

ID=8778325

Family Applications (1)

Application Number Title Priority Date Filing Date
US278281A Expired - Lifetime US3263233A (en) 1962-05-07 1963-05-06 Directive helical antenna having integral balun-feed

Country Status (4)

Country Link
US (1) US3263233A (en)
FR (1) FR1330197A (en)
GB (1) GB1040456A (en)
OA (1) OA00464A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3449752A (en) * 1965-10-08 1969-06-10 Csf Helical antenna electromagnetically coupled to resonant line
US5677699A (en) * 1994-11-29 1997-10-14 Cal Corporation Helical microstrip antenna with impedance taper
WO1998001920A1 (en) * 1996-07-10 1998-01-15 Centre National D'etudes Spatiales Transmission device with omnidirectional antenna

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2945227A (en) * 1956-11-21 1960-07-12 Csf Improvements in ultra short wave directive aerials
US3113316A (en) * 1960-05-23 1963-12-03 Collins Radio Co Uni-directional circularly polarized log periodic antenna

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2945227A (en) * 1956-11-21 1960-07-12 Csf Improvements in ultra short wave directive aerials
US3113316A (en) * 1960-05-23 1963-12-03 Collins Radio Co Uni-directional circularly polarized log periodic antenna

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3449752A (en) * 1965-10-08 1969-06-10 Csf Helical antenna electromagnetically coupled to resonant line
US5677699A (en) * 1994-11-29 1997-10-14 Cal Corporation Helical microstrip antenna with impedance taper
WO1998001920A1 (en) * 1996-07-10 1998-01-15 Centre National D'etudes Spatiales Transmission device with omnidirectional antenna
FR2751137A1 (en) * 1996-07-10 1998-01-16 Centre Nat Etd Spatiales OMNIDIRECTIONAL ANTENNA EMISSION DEVICE
US6300916B1 (en) 1996-07-10 2001-10-09 Centre National D'etudes Spatiales Transmission device with omnidirectional antenna

Also Published As

Publication number Publication date
FR1330197A (en) 1963-06-21
OA00464A (en) 1966-07-15
GB1040456A (en) 1966-08-24

Similar Documents

Publication Publication Date Title
US3569979A (en) Helical launcher
US2412320A (en) Antenna system
US3978434A (en) System separating filter for separating first and second doubly polarized frequency bands
US5592184A (en) Miniature antenna
US3864688A (en) Cross-polarized parabolic antenna
US2637775A (en) Coupling of a helical conductor to a wave guide
US3924205A (en) Cross-polarized parabolic antenna
GB2056181A (en) Electro-magnetic wave horn radiators
US3581311A (en) Linearly polarized microwave feed assembly for parabolic antennas and the like
US3263233A (en) Directive helical antenna having integral balun-feed
US3262121A (en) Antenna feed point crossover
US2127088A (en) Feeder and the like for electric currents of high frequency
US2580798A (en) Broad-band antenna system
US4396920A (en) Broad-band small-size radio-frequency antenna system
US4128840A (en) Resonant re-entrant cavity whip antenna
JPH0810801B2 (en) Ultra shortwave waveguide window
US3299428A (en) Horizontal semienclosed loop with conductive ground plane, having vertical whip extening from within loop enclosure
US4559474A (en) Travelling wave tube comprising means for suppressing parasite oscillations
US2281196A (en) Radio relay repeater
US3600711A (en) Coaxial filter having harmonic reflective and absorptive means
GB2132023A (en) Antenna coupler
US2921189A (en) Reduction of local oscillator radiation from an ultra-high frequency converter
US3449752A (en) Helical antenna electromagnetically coupled to resonant line
US2118429A (en) Antenna
US3808599A (en) Periodic antenna adapted for handling high power