US2617033A - Frame antenna - Google Patents

Frame antenna Download PDF

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Publication number
US2617033A
US2617033A US2774A US277448A US2617033A US 2617033 A US2617033 A US 2617033A US 2774 A US2774 A US 2774A US 277448 A US277448 A US 277448A US 2617033 A US2617033 A US 2617033A
Authority
US
United States
Prior art keywords
coil
short
frame
aerial
loops
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
US2774A
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English (en)
Inventor
Posthumus Klaas
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
Original Assignee
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 US2617033A publication Critical patent/US2617033A/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

Definitions

  • this invention relates to a frame aerial for transmitting and/or receiving purposes and consists in that, in order to increase the radiation resistance of the frame aerial, one or more shortcircuit turns are provided which are inductively coupled with the frame aerial coil and extend outwards from the periphery of the coil.
  • the short-circuit turns jointly constitute an annularsurface surrounding the coil body, and the short-circuit turns may embrace ring sectors adjoining each other.
  • the frame-aerial according to the invention is particularly suitable for the transmission of wide frequency bands with horizontal polarisation as is often neces sary, for instance in television, multiplex telephany and radio navigation.
  • Fig. 1 is a plan view of a frame-aerial comprising a single short-circuit turn and Fig. 2 is the experimentally determined polar radiation diagram.
  • Figs. 3 and 4 are a plan View and a sectional view respectively of a frame-aerial comprising a plurality of sector-shaped short-circuit turns,
  • Fig. 5 being the corresponding radiation diagram.
  • Fig. 6 illustrates, by way of example, one form of a frame aerial according to the invention comprising particularly formed short-circuit turns
  • Fig. 7 is a sectional detail view of a particular form of a frame-aerial coil Fig. 8 illustrating another executional example.
  • the reference numeral I designates a frame-aerial coil which consists of a single short-circuit turn and is connected to a transmission lead extending in accordance with the axis of the coil,
  • the coil I is surrounded by an annular metal plate 3 which is located in the coil plane and exhibits a radially directed interruption 4.
  • the said plate may be imagined to be replaced by one short-circuit turn extending in accordance with the periphery of the plate.
  • a current occurring in the frame coil induces on the short-circuit turn a current proportional thereto which, provided that the electrical length of the short-circuit turn is smaller than half the operating wavelength, is equally directed throughout the outer periphery of the short-circuit turn.
  • the circuit current thus produced comprises. however, a larger efiective surface than the coil I.
  • the external diameter of the short-circuit ring 3 was chosen to be ,4; of the operating wavelength (approximately 68 cms.) with a diameter of the coil I of approximately of the wavelength.
  • Figsp3 and 4 show a modified form of construction comprising eight sector-shaped short-circuit turns 6, whereas Fig. shows the corresponding radiation diagram.
  • the substantially circular radiation diagram proves that in this event the current along the outer periphery of the short-circuit sectors is everywhere equally directed. Currents occurring in neighbouring sector edges are oppositely directed, even if current loops and nodes occur along these edges, and do not contribute to the radiation. Consequently, the current in coil I is fundamentally urged towards the outer periphery of the system by the short-circuit turns.
  • the peripheral length of this turn is a measure of the frequency-dependency of the system; in the present case, however, it is not the length of the outer periphery of the system but the size of the short-circuit turns which is a measure of the frequency-dependency of the system.
  • the short-circuit turns behave as impedance transformers, which may be v utilised, for example for attaining a very high input impedance of coil I; however, this involves an outstanding frequency-dependency of the system.
  • the said electric lengths of the short-circuit turns should be avoided, but it is also possible to reduce the frequency-dependency by giving successive short-circuit turns electric lengths which diverge on different sides from one fourth of the operating wavelength (for example by 5%). This may, for example, be achieved either by a suitable choice of the radial lengths of the sectors 6 or of the opening angles of the sectors or by combination of these two measures.
  • Fig. 6 1s a sectional view of one form of a frame-aerial according to the invention, in which the surface occupied by the short-circuit turns 6' is conical. Operation and effect of the shortcircuit turns are not affected by such a shape,,--;
  • a satisfactory operation of the system requires a very close coupling between the short-circuit turns 6 and the coupling coil 1; for this purpose neighboring edges of the surface of the framecoil and the annular surface occupied by the short-circuit turns may be constructed to overlap one another.
  • Fig. 7 one form of the frame-aerial suitable for this purpose is shown in a sectional de--- tail view of Fig. 3.
  • the turn of the coil l exhibiting a U-shaped section 1 includes the inner edge 8 of the short-circuit sectors 6.
  • the sectors at the primarily current-conveying areas may be coated, for instance by cataphoresis, with a thin metal layer of high conductivity.
  • short-circuit turns consisting of not too thin metal plates (for example of some few mms.) have proved to be suitable.
  • the sectors 6 and the coil 1 may be mounted on a plate of insulating material.
  • the mechanical supporting means are not shown in the drawing.
  • the conductive parts of the aerial system according to the invention may consist of metal coatings applied, for example, by chemical agency, on to insulating material.
  • the sectors may be supported at the centre by metal parts which may be interconnected, if desired.
  • a frame aerial structure comprising a centrally disposed open-circuited coil, and a plurality of short-circuited loops inductively coupled to said coil and circumferentially arranged thereabout, the loops extending outwardly from the periphery from the coil and being shaped to define adjoining and electrically separated sectors in the area encircling said coil.
  • a high-frequency frame aerial structure comprising a centrally disposed open-circuited coil, and a plurality of short-circuited loops inductively coupled to said coil and circumferentially arranged thereabout, the loops extending outwardly from the periphery from the coil and being shaped to define adjoining electrically separated sectors in an annular surface surrounding said coil.
  • a high-frequency frame aerial structure comprising a centrally disposed open-circuited single-turn coil, and a plurality of short-circuited loops inductively coupled to said coil and circumferentially arranged thereabout, the loops extending outwardly from the periphery from the coil and being shaped to define adjoining electrically separated sectors in an annular surface surrounding said coil.
  • said single-turn coil has a U-shaped cross section to define a circular channel, the edges of said loops adjacent said coil being received within said channel to effect inductive coupling between saidloops and said coil.
  • a frame aerial structure comprising a centrally disposed open-circuited coil, and a plurality of short-circuited loops inductively coupled to said coil and circumferentially arranged thereabout, the loops extending outwardly from the periphery of said coil and being shaped to define adjoining sectors in a conical surface surrounding said coil.
  • a frame aerial structure comprising a centrally disposed open-circuited single-turn coil, and a plurality of short-circuited loops constituted by metallic plates inductively coupled to said coil and circumferentially arranged thereabout, the loops extending outwardly from the periphery of said coil and being shaped to define adjoining sectors in a conical surface surrounding said coil, adjacent edges of said loops being disposed in overlapping relation.
  • a frame aerial structure comprising a centrally disposed open-circuited coil, a first series of short-circuited loops inductively coupled to said coil and circumferentially arranged thereabout, the loops in said first series extending outwardly from the periphery of said'coil and being shaped to define adjoining sectors in an annular surface surrounding said coil, and a second series of short-circuited loops circumferentially arranged about said first series of loops and inductively coupled thereto, the loops in said second series extending outwardly and being shaped to define adjoining sectors in an an- 6 nular surface surrounding the annular surface occupied by said first series.

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  • Formation Of Insulating Films (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Details Of Aerials (AREA)
US2774A 1947-01-25 1948-01-16 Frame antenna Expired - Lifetime US2617033A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL656887X 1947-01-25

Publications (1)

Publication Number Publication Date
US2617033A true US2617033A (en) 1952-11-04

Family

ID=19795258

Family Applications (1)

Application Number Title Priority Date Filing Date
US2774A Expired - Lifetime US2617033A (en) 1947-01-25 1948-01-16 Frame antenna

Country Status (6)

Country Link
US (1) US2617033A (en, 2012)
BE (1) BE479859A (en, 2012)
DE (1) DE807100C (en, 2012)
FR (1) FR960134A (en, 2012)
GB (1) GB656887A (en, 2012)
NL (1) NL72283C (en, 2012)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2770800A (en) * 1951-06-02 1956-11-13 Itt Antennas
US4458248A (en) * 1982-04-26 1984-07-03 Haramco Research, Inc. Parametric antenna
US5142861A (en) * 1991-04-26 1992-09-01 Schlicher Rex L Nonlinear electromagnetic propulsion system and method
WO2007084510A1 (en) * 2006-01-18 2007-07-26 Impinj, Inc. Discontinuous-loop rfid reader antenna and methods
USD570337S1 (en) 2006-08-25 2008-06-03 Impinj, Inc. Broken-loop RFID reader antenna for near field and far field UHF RFID tags
USD574370S1 (en) * 2008-02-14 2008-08-05 Impinj, Inc. Broken-loop RFID reader antenna for near field and far field UHF RFID tags
USD591734S1 (en) * 2008-09-22 2009-05-05 Nissei Limited Television or communication antenna element comprising a high frequency wave coupler
USD630196S1 (en) * 2010-08-04 2011-01-04 Tagsys Sas Antenna
USD666179S1 (en) * 2011-08-01 2012-08-28 Avery Dennison Corporation RFID inlay
USD713392S1 (en) * 2011-10-28 2014-09-16 World Products, Inc. Circular tri-level antenna
USD743400S1 (en) * 2010-06-11 2015-11-17 Ricoh Company, Ltd. Information storage device
USD852172S1 (en) * 2017-07-11 2019-06-25 Shenzhen BITECA Electron Co., Ltd. HDTV antenna

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8919283D0 (en) * 1989-08-24 1989-10-04 Phase Track Limited Active loop antenna

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE388072C (de) * 1923-02-02 1924-01-09 Siemens & Halske Akt Ges Ringfoermige Antenne
FR620848A (fr) * 1926-08-27 1927-04-29 Cadre récepteur pour radio-télégraphie et radio-téléphonie
US2166750A (en) * 1936-02-15 1939-07-18 Rca Corp Antenna
GB519350A (en) * 1937-12-06 1940-03-21 Standard Telephones Cables Ltd Directional radio antenna arrays
US2256472A (en) * 1939-10-20 1941-09-23 Abram A Cory Radio direction finder deviation correction device
US2284131A (en) * 1940-03-23 1942-05-26 Hazeltine Corp Antenna system for modulatedcarrier signal receivers
CH233309A (de) * 1937-12-06 1944-07-15 Bell Telephone Mfg Richtantennenanlage.
US2405123A (en) * 1943-08-07 1946-08-06 Gen Electric Antenna system
US2457127A (en) * 1945-06-27 1948-12-28 Standard Telephones Cables Ltd Antenna system
US2480117A (en) * 1945-06-27 1949-08-30 Standard Telephones Cables Ltd Direction finder

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE388072C (de) * 1923-02-02 1924-01-09 Siemens & Halske Akt Ges Ringfoermige Antenne
FR620848A (fr) * 1926-08-27 1927-04-29 Cadre récepteur pour radio-télégraphie et radio-téléphonie
US2166750A (en) * 1936-02-15 1939-07-18 Rca Corp Antenna
GB519350A (en) * 1937-12-06 1940-03-21 Standard Telephones Cables Ltd Directional radio antenna arrays
CH233309A (de) * 1937-12-06 1944-07-15 Bell Telephone Mfg Richtantennenanlage.
US2256472A (en) * 1939-10-20 1941-09-23 Abram A Cory Radio direction finder deviation correction device
US2284131A (en) * 1940-03-23 1942-05-26 Hazeltine Corp Antenna system for modulatedcarrier signal receivers
US2405123A (en) * 1943-08-07 1946-08-06 Gen Electric Antenna system
US2457127A (en) * 1945-06-27 1948-12-28 Standard Telephones Cables Ltd Antenna system
US2480117A (en) * 1945-06-27 1949-08-30 Standard Telephones Cables Ltd Direction finder

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2770800A (en) * 1951-06-02 1956-11-13 Itt Antennas
US4458248A (en) * 1982-04-26 1984-07-03 Haramco Research, Inc. Parametric antenna
US5142861A (en) * 1991-04-26 1992-09-01 Schlicher Rex L Nonlinear electromagnetic propulsion system and method
WO2007084510A1 (en) * 2006-01-18 2007-07-26 Impinj, Inc. Discontinuous-loop rfid reader antenna and methods
US20080048867A1 (en) * 2006-01-18 2008-02-28 Oliver Ronald A Discontinuous-Loop RFID Reader Antenna And Methods
USD570337S1 (en) 2006-08-25 2008-06-03 Impinj, Inc. Broken-loop RFID reader antenna for near field and far field UHF RFID tags
USD574369S1 (en) * 2006-08-25 2008-08-05 Impinj, Inc. Broken-loop RFID reader antenna for near field and far field UHF RFID tags
USD574370S1 (en) * 2008-02-14 2008-08-05 Impinj, Inc. Broken-loop RFID reader antenna for near field and far field UHF RFID tags
USD591734S1 (en) * 2008-09-22 2009-05-05 Nissei Limited Television or communication antenna element comprising a high frequency wave coupler
USD743400S1 (en) * 2010-06-11 2015-11-17 Ricoh Company, Ltd. Information storage device
US20180253028A1 (en) 2010-06-11 2018-09-06 Yasufumi Takahashi Apparatus and method for preventing an information storage device from falling from a removable device
US11768448B2 (en) 2010-06-11 2023-09-26 Ricoh Company, Ltd. Information storage system including a plurality of terminals
US11429036B2 (en) 2010-06-11 2022-08-30 Ricoh Company, Ltd. Information storage system including a plurality of terminals
US9256158B2 (en) 2010-06-11 2016-02-09 Ricoh Company, Limited Apparatus and method for preventing an information storage device from falling from a removable device
USD757161S1 (en) 2010-06-11 2016-05-24 Ricoh Company, Ltd. Toner container
USD758482S1 (en) 2010-06-11 2016-06-07 Ricoh Company, Ltd. Toner bottle
US9599927B2 (en) 2010-06-11 2017-03-21 Ricoh Company, Ltd. Apparatus and method for preventing an information storage device from falling from a removable device
US9989887B2 (en) 2010-06-11 2018-06-05 Ricoh Company, Ltd. Apparatus and method for preventing an information storage device from falling from a removable device
US11275327B2 (en) 2010-06-11 2022-03-15 Ricoh Company, Ltd. Information storage system including a plurality of terminals
US11188007B2 (en) 2010-06-11 2021-11-30 Ricoh Company, Ltd. Developer container which discharges toner from a lower side and includes a box section
US10725398B2 (en) 2010-06-11 2020-07-28 Ricoh Company, Ltd. Developer container having a cap with three portions of different diameters
US10754275B2 (en) 2010-06-11 2020-08-25 Ricoh Company, Ltd. Apparatus and method for preventing an information storage device from falling from a removable device
USD630196S1 (en) * 2010-08-04 2011-01-04 Tagsys Sas Antenna
USD666179S1 (en) * 2011-08-01 2012-08-28 Avery Dennison Corporation RFID inlay
USD713392S1 (en) * 2011-10-28 2014-09-16 World Products, Inc. Circular tri-level antenna
USD852172S1 (en) * 2017-07-11 2019-06-25 Shenzhen BITECA Electron Co., Ltd. HDTV antenna

Also Published As

Publication number Publication date
FR960134A (en, 2012) 1950-04-13
BE479859A (en, 2012)
GB656887A (en) 1951-09-05
NL72283C (en, 2012)
DE807100C (de) 1951-06-25

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