US2968807A - Ferro-magnetic core antenna - Google Patents

Ferro-magnetic core antenna Download PDF

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Publication number
US2968807A
US2968807A US732638A US73263858A US2968807A US 2968807 A US2968807 A US 2968807A US 732638 A US732638 A US 732638A US 73263858 A US73263858 A US 73263858A US 2968807 A US2968807 A US 2968807A
Authority
US
United States
Prior art keywords
antenna
ferro
magnetic
core
members
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
US732638A
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English (en)
Inventor
Troost Albert
Ziehm Gunter
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.)
Telefunken AG
Original Assignee
Telefunken AG
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 Telefunken AG filed Critical Telefunken AG
Application granted granted Critical
Publication of US2968807A publication Critical patent/US2968807A/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
    • H01Q7/06—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 with core of ferromagnetic material
    • H01Q7/08—Ferrite rod or like elongated core

Definitions

  • the present invention relates to an antenna having a core of ferro-magnetic material and, more particularly, 4to a rod-shaped ferrite-antenna comprising several individual ferromagnetic members arranged adjacent one another and being mechanically joined.
  • Such long ferro-magnetic cores comprising shorter rod members, are readily subjected to mechanical stresses. This is particularly true, if the antennas are attached to vehicles, wherein the antenna cores may break under the mechanical stresses. Another kind of strong mechanical stress occurs if the rods of ferro-magnetic material are mounted at their centers to supports, about which the antennas can be rotated at high speed. Even if the core should not break due to motion, adjacent members of the sectional cores will wear, due to frictional rubbing against each other.
  • a core thus assembled does not have the disadvantages of the cores of the prior art antennas.
  • the resistance against mechanical stresses is thus greatly increased.
  • the superior electric properties of a ferro-magnetic antenna are unexpectedly retained, despite the insertion of the resilient material according to the invention.
  • Figure l is a longitudinal section through an antenna according to the invention.
  • Figure 2 is a longitudinal section through an end portion of a modied antenna according to the invention.
  • an antenna 10 comprises three individual ferro-magnetic rod members 11, 12, 13.
  • Resilient disks 22 and 23, preferably of rubber or plastic, are inserted between the ends of the rod members-11, 12 and 12, 13, respectively.
  • the rod members 11, 12 and 13 and the disks 22 and 23 are provided with central bores, through which a common mandrel, such as a brass stud 17, is passed, aligning these members and disks and retaining them as a unit.
  • Resilient disks 21 and 24 also having central bores are provided adjacent the outer ends of the rod members 11 and 13 on the brass stud 17.
  • ferro-magnetic material is saved, due to the provision of the bores.
  • the center thereof will be almost free of electro-magnetic fields, i.e., ⁇ such fields are displaced towards the outer peripheries of the ferro-magnetic members.
  • the mandrel comprises a tube 18.
  • the outer ends of this tube 18' are internally threaded at 20 to receive mounting screws 19 retaining the ends of the antenna core and fulfilling the function of the nuts 14 and 15 in Figure 1. With such screws 19 at both ends, the entire structural length of the antenna is scarcely increased beyond the total of the individual antenna components. In other words, the mandrel tube 18 does not protrude from the end disks 21 and 24.
  • the antenna may be used as a unit in a larger antenna assembly, for example, a cross-loop or a square.
  • a cross-loop antenna two antennas as shown in the drawing may be simply superimposed.
  • a square four of such antennas will be interconnected to form the four sides of a square.
  • a plurality of coils may be provided on the antenna rod'l() and may be uniformly distributed along its length, whereby each of the rod members 11, 12, 13 may support one or several of such coils.
  • An elongated rod-type antenna having a ferro-magnetic core said antenna comprising, in combination: a series of ferro-magnetic tubular cores having axially aligned bores; a plurality of thin resilient spacer rings interposed between and covering substantially the entire surface of the end faces of adjacent cores; and clamping means extending through said central bores of said cores and through the centers of said spacer rings for clamping together -said series of cores and the interposed spacer rings' to form apsingle rod-type antenna, whereby said antenna possesses an inherent elasticity afforded by the resiliency of said spacer rings between adjacent cores, thereby avoiding breakage of the antenna when the same is ⁇ subjected to mechanical stresses.

Landscapes

  • Soft Magnetic Materials (AREA)
  • Details Of Aerials (AREA)
US732638A 1957-05-04 1958-05-02 Ferro-magnetic core antenna Expired - Lifetime US2968807A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET13553A DE1185256B (de) 1957-05-04 1957-05-04 Rahmenantenne mit ferromagnetischem Kern, insbesondere Ferritstabantenne

Publications (1)

Publication Number Publication Date
US2968807A true US2968807A (en) 1961-01-17

Family

ID=7547370

Family Applications (1)

Application Number Title Priority Date Filing Date
US732638A Expired - Lifetime US2968807A (en) 1957-05-04 1958-05-02 Ferro-magnetic core antenna

Country Status (5)

Country Link
US (1) US2968807A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE1185256B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR1192884A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB824546A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NL (1) NL226919A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3302208A (en) * 1964-03-20 1967-01-31 Hendrickson Alice Dipole antenna including ferrite sleeves about the medial portions of its radiating elements
US3310807A (en) * 1964-02-24 1967-03-21 Boeing Co Apparatus for effecting the transmission of electromagnetic energy through a dense plasma
US3323091A (en) * 1964-11-05 1967-05-30 Honeywell Inc Multicore transformer including integral mounting assembly
US3808425A (en) * 1969-09-15 1974-04-30 Westinghouse Air Brake Co Vehicle-carried inductive pickup device
EP3731343A1 (de) * 2019-04-25 2020-10-28 Schaffner EMV AG Antenne

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2221097B (en) * 1988-06-24 1992-11-25 Nippon Antenna Kk Automotive antenna

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2122893A (en) * 1932-08-12 1938-07-05 Telefunken Gmbh Conductor for radio frequency currents
US2206261A (en) * 1935-09-10 1940-07-02 Ferrocart Corp Magnetic core and coil assembly
US2401882A (en) * 1942-05-22 1946-06-11 Rca Corp Ultra high frequency inductor
GB707142A (en) * 1950-12-04 1954-04-14 Wladimir John Polydoroff Improvements in and relating to antennas for radio apparatus
US2702860A (en) * 1953-08-21 1955-02-22 Zenith Radio Corp Loop antenna
US2909742A (en) * 1953-09-01 1959-10-20 Gen Electric Machine wound magnetic core

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE738454C (de) * 1938-08-21 1943-08-16 Siemens Ag Rahmenantenne
US2438680A (en) * 1943-03-11 1948-03-30 Wladimir J Polydoroff Loop antenna apparatus
DE816426C (de) * 1948-10-02 1951-10-11 Blaupunkt Werke Gmbh Eisenkernanordnung fuer UEberlagerungsempfaenger

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2122893A (en) * 1932-08-12 1938-07-05 Telefunken Gmbh Conductor for radio frequency currents
US2206261A (en) * 1935-09-10 1940-07-02 Ferrocart Corp Magnetic core and coil assembly
US2401882A (en) * 1942-05-22 1946-06-11 Rca Corp Ultra high frequency inductor
GB707142A (en) * 1950-12-04 1954-04-14 Wladimir John Polydoroff Improvements in and relating to antennas for radio apparatus
US2702860A (en) * 1953-08-21 1955-02-22 Zenith Radio Corp Loop antenna
US2909742A (en) * 1953-09-01 1959-10-20 Gen Electric Machine wound magnetic core

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3310807A (en) * 1964-02-24 1967-03-21 Boeing Co Apparatus for effecting the transmission of electromagnetic energy through a dense plasma
US3302208A (en) * 1964-03-20 1967-01-31 Hendrickson Alice Dipole antenna including ferrite sleeves about the medial portions of its radiating elements
US3323091A (en) * 1964-11-05 1967-05-30 Honeywell Inc Multicore transformer including integral mounting assembly
US3808425A (en) * 1969-09-15 1974-04-30 Westinghouse Air Brake Co Vehicle-carried inductive pickup device
EP3731343A1 (de) * 2019-04-25 2020-10-28 Schaffner EMV AG Antenne

Also Published As

Publication number Publication date
NL226919A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE1185256B (de) 1965-01-14
GB824546A (en) 1959-12-02
FR1192884A (fr) 1959-10-29

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