US2617028A - Aerial system comprising a concentric transmission line - Google Patents

Aerial system comprising a concentric transmission line Download PDF

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Publication number
US2617028A
US2617028A US76434A US7643449A US2617028A US 2617028 A US2617028 A US 2617028A US 76434 A US76434 A US 76434A US 7643449 A US7643449 A US 7643449A US 2617028 A US2617028 A US 2617028A
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US
United States
Prior art keywords
transmission line
radiator
aerial
aerial system
wavelength
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
US76434A
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English (en)
Inventor
Stolk Jan
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.)
Hartford National Bank and Trust Co
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Hartford National Bank and Trust 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 Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
Application granted granted Critical
Publication of US2617028A publication Critical patent/US2617028A/en
Anticipated expiration legal-status Critical
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength

Definitions

  • the present invention provides a construction in which the said inconvenience is obviated.
  • the invention exhibits the characteristic that the inner conductor of the transmission line is connected to that extremity of one part of the interrupted radiator which is adjacent the interior, the inner conductor being led in an insulated manner through the interior of the other part of the interrupted radiator as far as the external extremity thereof and thence led through the interior of a non-interrupted radiator and through an aperture provided midway of the last-mentioned radiator to the exterior, extending from this point through a distance equal to at least a quarter wavelength in a direction at right angles to the longitudinal axis of the radiator, the envelope of the transmission line being connected to the centre of the last-mentioned radiator.
  • the aerial system is thus rendered symmetrical with respect to the envelope, the symmetry obtained not being dependent on frequency.
  • an aerial system connected to 5 Claims. (01. 250-33) 2 a concentric transmission line exhibiting frequency-independent symmetry is known per se.
  • an aerialsystem is a frame aerial.
  • a dipole, aerial in which the coupling with a concentric transmission line is established by means of a coupling section which is somewhat similar to the'aerial system according to the invention.
  • a coupling section which is somewhat similar to the'aerial system according to the invention.
  • separate dipole radiators are secured to the coupling system.
  • the aerial systemshown comprises three tubular radiators I, 2 and 3, each having a length of approximately V in which i represents the wavelength at the centre of the wavelength range thatmay b covered by the aerial.
  • the radiator 3 is interrupted midway at 4. At'the; extremities, the radiators l, 2 and 3 are interconnected by connectionsi and 6, which are like wise tubular. The spacing ofthe 'radiators'is small with respect to A.
  • the radiators here ex? tend in a plane, butthis is not essential.
  • a core 1 of a transmission line I, 8 is connected to the upper part of the radiator 3 and, in the manner shown, led in an insulated manner through the lower part of the radiator 3, through the connecting piece 5 and through the lower half of the radiator l.
  • the last-mentioned radiator exhibits midway at 9 an aperture through which the core 1 is led to the exterior.
  • the envelope 8 of the transmission line I, 8 is connected along the edge of the said aperture to the radiator I, the aerial system thus being geometrically symmetric with respect to the envelope 8. Voltages set up in phase opposition between the adjacent extremities of the interrupted radiator 3 now do not result in currents being produced along the outside of the envelope 8.
  • a folded dipole aerial structure adapted to operate within a predetermined wavelength range comprising first and second parallel radiating elements of substantially equal length, the spacing between said elements being less than a quarter of a wavelength of the central wavelength in said range.
  • first and second conductors having a length relatively small with respect to said elements and interconnecting the respective extremities of said first and second elements, said second element being divided at the midpoint thereof to form a first section and a second section, said first section of said second element,
  • first conductor and said first conductor being hollow, and a concentric line for feeding said radiators, said line having an outer conductor connected to the midpoint or said first element, and an inner conductor extending through said hollow portion of said first element, said hollow first conductor andradiating elements having a length substantially equal to one half the wavelength of the central wavelength in said range, the spacing between saidxelements being. less. a q ar e f, a wavelength of said central wavelength, first and second conductors interconnecting the respective extremities of said elements. Said; second element being divided at the midpoint thereof to term afirst section and a second section, and first sectionof said Second element, the correspondingportion of.
  • said first element and said first conductter being hollow, and a concentric trans ission line ieed ns said elemen s. sa d line 1 an outer conductor connected to the mi p int at said. that e eme t n p s d a r ght angles thereto and having an inner conductor extending through the hollow portion of said first element, the hollow first conductor and the h0llow first section and being connected to the free end of said second section.

Landscapes

  • Non-Reversible Transmitting Devices (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
US76434A 1948-04-16 1949-02-15 Aerial system comprising a concentric transmission line Expired - Lifetime US2617028A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL661240X 1948-04-16

Publications (1)

Publication Number Publication Date
US2617028A true US2617028A (en) 1952-11-04

Family

ID=19797561

Family Applications (1)

Application Number Title Priority Date Filing Date
US76434A Expired - Lifetime US2617028A (en) 1948-04-16 1949-02-15 Aerial system comprising a concentric transmission line

Country Status (4)

Country Link
US (1) US2617028A (enrdf_load_stackoverflow)
BE (1) BE488516A (enrdf_load_stackoverflow)
FR (1) FR984728A (enrdf_load_stackoverflow)
GB (1) GB661240A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2755465A (en) * 1949-10-07 1956-07-17 Marconi Wireless Telegraph Co Aerials
US2934761A (en) * 1955-07-15 1960-04-26 Itt Aircraft antenna system
US3521286A (en) * 1967-04-21 1970-07-21 Gen Dynamics Corp Orthogonal array antenna system
US4015265A (en) * 1974-07-18 1977-03-29 Etat Francais Folded doublet antenna
US4084162A (en) * 1975-05-15 1978-04-11 Etat Francais Represented By Delegation Ministerielle Pour L'armement Folded back doublet microstrip antenna
US4511900A (en) * 1982-05-10 1985-04-16 Rockwell International Corporation Current enhanced monopole radiation type antenna apparatus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2167709A (en) * 1936-03-17 1939-08-01 Emi Ltd Wireless aerial system
US2243677A (en) * 1939-05-13 1941-05-27 Rca Corp Wide band antenna
US2283914A (en) * 1937-07-24 1942-05-26 Rca Corp Antenna
US2465379A (en) * 1945-01-27 1949-03-29 Standard Telephones Cables Ltd Antenna unit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2167709A (en) * 1936-03-17 1939-08-01 Emi Ltd Wireless aerial system
US2283914A (en) * 1937-07-24 1942-05-26 Rca Corp Antenna
US2243677A (en) * 1939-05-13 1941-05-27 Rca Corp Wide band antenna
US2465379A (en) * 1945-01-27 1949-03-29 Standard Telephones Cables Ltd Antenna unit

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2755465A (en) * 1949-10-07 1956-07-17 Marconi Wireless Telegraph Co Aerials
US2934761A (en) * 1955-07-15 1960-04-26 Itt Aircraft antenna system
US3521286A (en) * 1967-04-21 1970-07-21 Gen Dynamics Corp Orthogonal array antenna system
US4015265A (en) * 1974-07-18 1977-03-29 Etat Francais Folded doublet antenna
US4084162A (en) * 1975-05-15 1978-04-11 Etat Francais Represented By Delegation Ministerielle Pour L'armement Folded back doublet microstrip antenna
US4511900A (en) * 1982-05-10 1985-04-16 Rockwell International Corporation Current enhanced monopole radiation type antenna apparatus

Also Published As

Publication number Publication date
GB661240A (en) 1951-11-21
FR984728A (fr) 1951-07-10
BE488516A (enrdf_load_stackoverflow)

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