US3623113A - Balanced tunable helical monopole antenna - Google Patents

Balanced tunable helical monopole antenna Download PDF

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Publication number
US3623113A
US3623113A US852052A US3623113DA US3623113A US 3623113 A US3623113 A US 3623113A US 852052 A US852052 A US 852052A US 3623113D A US3623113D A US 3623113DA US 3623113 A US3623113 A US 3623113A
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United States
Prior art keywords
antenna
winding
helical
elements
helical winding
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Expired - Lifetime
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US852052A
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English (en)
Inventor
Ivan M Faigen
Valor C Smith
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CHU ASSOCIATES
CHU ASSOCIATES Inc
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CHU ASSOCIATES
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Publication of US3623113A publication Critical patent/US3623113A/en
Assigned to BAYBANK MIDDLESEX reassignment BAYBANK MIDDLESEX LICENSE (SEE DOCUMENT FOR DETAILS). Assignors: CHU ASSOCIATES, INC. A CORP. OF MA
Assigned to LIQUID CRYSTAL TECHNOLOGY, INC., reassignment LIQUID CRYSTAL TECHNOLOGY, INC., SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DAVIS, FREDERICK
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/362—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith for broadside radiating helical antennas
    • 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

Definitions

  • the present invention relates to helical antennas, being more specifically directed to tunable helical monopoles and the like.
  • a further object is to provide a novel and balanced antenna of more general utility, as well.
  • the invention contemplates a helical antenna winding centrally fed and provided with a pair of similar terminal antenna elements, one connected to each end of the helical winding and each provided with shorting means for contacting the turns of the helical winding thereadjacent; the system being provided with means at each end for synchronously rotating shorting means around the helical winding towards or away from the center of the helical winding to tune the antenna.
  • FIG. 1 is a schematic circuit diagram illustrating the invention in preferred form
  • FIG. 2 is a similar view of the modification.
  • a helical monopole antenna winding is shown at 1 having an upper portion 1 and a lower portion 1", symmetrically substantially identical.
  • cylindrical terminal dipole antenna elements 2 and 2' preferably in the form of top hat or can"-type housings electrically connected with respective upper and lower ends of the helical winding 1.
  • shorting fingers Connected with these terminal elements 2 and 2 are shorting fingers, schematically illustrated at 3 and 3', respectively, which, in response to the rotation of, for example, an internally disposed insulating screw or other threaded member 5 to which they may be mechanically secured, are caused to move synchronously both towards the center of the helical winding 1 or away from the same, as in response to the driving action of a motor M which may, if desired, be contained within the element 2.
  • the fingers 3 and 3' will thus synchronously effectively shorten or lengthen the respective helical winding halves l and l" to tune the same.
  • Other types of ganged symmetrical shorting elements may similarly be used.
  • radiation is effected or received in the normal mode; that is, with a radiation pattern extending in a plane normal to the winding axis along which the member 5 is disposed.
  • This is shown effected by means of a feed loop 7, connected to the feed transmission line 9, and illustrated in the fonn of a coupling, as described in said Letters Patent, though other types of central symmetrical feeding may also be employed.
  • the antenna may be operated over wide tunable frequency ranges without the necessity for a ground plane' and thus, the antenna becomes entirely useab c with small vehicles, masts and other structures where such structures themselves serve as ineffective ground planes, as before discussed.
  • FIG. 2 A somewhat similar structure is illustrated in FIG. 2, more particularly adapted for horizontal operation, wherein, again, the elements 3 and 3' are ganged to move synchronously, inwardly and outwardly, symmetrically and simultaneously to tune the two equal halves l' and 1" ofthe helical winding 1.
  • the dipole extensions 20 and 20' are shown in the form of linear elements extending substantially parallel with winding axis and, indeed, if desired, in the form of wire dipole radiators which may support the helical winding.
  • a monopole of the type illustrated in FIG. 1 has been successfully operated over the wide band from 17 MHz. to about MHz. with an overall antenna length of about 21 inches and a helical winding length of about 10 inches, with a helical turn diameter or winding cross dimension of about 3 inches.
  • a balanced tunable helical monopole antenna which obviates the need for a ground plane, having, in combination, a continuous helical monopole winding, means for feeding the winding disposed centrally thereof such that the radiation pattern of the helical winding extends in a plane normal to the winding axis, a pair of similar terminal antenna elements, one connected to each end of the helical winding and each provided with shorting means for contacting the turns of the helical winding thereadjacent, and means for synchronously adjusting said shorting means towards and away from the center of the helical winding to tune the antenna.

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  • Details Of Aerials (AREA)
US852052A 1969-08-21 1969-08-21 Balanced tunable helical monopole antenna Expired - Lifetime US3623113A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US85205269A 1969-08-21 1969-08-21

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US3623113A true US3623113A (en) 1971-11-23

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US852052A Expired - Lifetime US3623113A (en) 1969-08-21 1969-08-21 Balanced tunable helical monopole antenna

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US (1) US3623113A (fr)
BE (1) BE760653A (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3818488A (en) * 1973-01-18 1974-06-18 Itt Shipboard yardarm half-wave antenna
US4201990A (en) * 1975-04-21 1980-05-06 Hustler, Inc. Tunable dipole antenna
US4442438A (en) * 1982-03-29 1984-04-10 Motorola, Inc. Helical antenna structure capable of resonating at two different frequencies
US4462033A (en) * 1977-01-03 1984-07-24 Quick-Mount Manufacturing Co., Inc. Antenna with spring loading coil
US4504834A (en) * 1982-12-22 1985-03-12 Motorola, Inc. Coaxial dipole antenna with extended effective aperture
US4620194A (en) * 1982-11-16 1986-10-28 Joaquin Bel Moratalla Tunable antenna with variable series L-C network
US5512914A (en) * 1992-06-08 1996-04-30 Orion Industries, Inc. Adjustable beam tilt antenna
US5635945A (en) * 1995-05-12 1997-06-03 Magellan Corporation Quadrifilar helix antenna
US5706018A (en) * 1996-06-21 1998-01-06 Yankielun; Norbert E. Multi-band, variable, high-frequency antenna
US5977931A (en) * 1997-07-15 1999-11-02 Antenex, Inc. Low visibility radio antenna with dual polarization
US6448942B2 (en) * 1998-06-25 2002-09-10 Siemens Aktiengesellschaft Tunable antenna having separate radiator parts and process for manufacturing it
US20030107527A1 (en) * 2001-12-10 2003-06-12 Lee Man Wei Multi-band uniform helical antenna and communication device having the same
US20050200554A1 (en) * 2004-01-22 2005-09-15 Chau Tam H. Low visibility dual band antenna with dual polarization
US9893715B2 (en) 2013-12-09 2018-02-13 Shure Acquisition Holdings, Inc. Adaptive self-tunable antenna system and method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2636986A (en) * 1953-04-28 Television antenna
US2866197A (en) * 1953-03-20 1958-12-23 Itt Tuned antenna system
US2875443A (en) * 1954-06-21 1959-02-24 Itt Antenna
US2993204A (en) * 1958-02-28 1961-07-18 Itt Two-band helical antenna
US3438046A (en) * 1966-06-17 1969-04-08 Itt Quick tune helical antenna

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2636986A (en) * 1953-04-28 Television antenna
US2866197A (en) * 1953-03-20 1958-12-23 Itt Tuned antenna system
US2875443A (en) * 1954-06-21 1959-02-24 Itt Antenna
US2993204A (en) * 1958-02-28 1961-07-18 Itt Two-band helical antenna
US3438046A (en) * 1966-06-17 1969-04-08 Itt Quick tune helical antenna

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3818488A (en) * 1973-01-18 1974-06-18 Itt Shipboard yardarm half-wave antenna
US4201990A (en) * 1975-04-21 1980-05-06 Hustler, Inc. Tunable dipole antenna
US4462033A (en) * 1977-01-03 1984-07-24 Quick-Mount Manufacturing Co., Inc. Antenna with spring loading coil
US4442438A (en) * 1982-03-29 1984-04-10 Motorola, Inc. Helical antenna structure capable of resonating at two different frequencies
US4620194A (en) * 1982-11-16 1986-10-28 Joaquin Bel Moratalla Tunable antenna with variable series L-C network
US4504834A (en) * 1982-12-22 1985-03-12 Motorola, Inc. Coaxial dipole antenna with extended effective aperture
US5512914A (en) * 1992-06-08 1996-04-30 Orion Industries, Inc. Adjustable beam tilt antenna
US5635945A (en) * 1995-05-12 1997-06-03 Magellan Corporation Quadrifilar helix antenna
US5706018A (en) * 1996-06-21 1998-01-06 Yankielun; Norbert E. Multi-band, variable, high-frequency antenna
US5977931A (en) * 1997-07-15 1999-11-02 Antenex, Inc. Low visibility radio antenna with dual polarization
US6292156B1 (en) 1997-07-15 2001-09-18 Antenex, Inc. Low visibility radio antenna with dual polarization
US6448942B2 (en) * 1998-06-25 2002-09-10 Siemens Aktiengesellschaft Tunable antenna having separate radiator parts and process for manufacturing it
US20030107527A1 (en) * 2001-12-10 2003-06-12 Lee Man Wei Multi-band uniform helical antenna and communication device having the same
US6608605B2 (en) * 2001-12-10 2003-08-19 Hewlett-Packard Development Company, L.P. Multi-band uniform helical antenna and communication device having the same
US20050200554A1 (en) * 2004-01-22 2005-09-15 Chau Tam H. Low visibility dual band antenna with dual polarization
US7209096B2 (en) 2004-01-22 2007-04-24 Antenex, Inc. Low visibility dual band antenna with dual polarization
US9893715B2 (en) 2013-12-09 2018-02-13 Shure Acquisition Holdings, Inc. Adaptive self-tunable antenna system and method
US10348272B2 (en) 2013-12-09 2019-07-09 Shure Acquisition Holdings, Inc. Adaptive self-tunable antenna system and method
US11469740B2 (en) 2013-12-09 2022-10-11 Shure Acquisition Holdings, Inc. Adaptive self-tunable antenna system and method

Also Published As

Publication number Publication date
BE760653A (fr) 1971-05-27

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AS Assignment

Owner name: LIQUID CRYSTAL TECHNOLOGY, INC.,

Free format text: SECURITY INTEREST;ASSIGNOR:DAVIS, FREDERICK;REEL/FRAME:003904/0399

Effective date: 19810723

Owner name: BAYBANK MIDDLESEX, SEVEN NEW ENGLAND EXECUTIVE PAR

Free format text: LICENSE;ASSIGNOR:CHU ASSOCIATES, INC. A CORP. OF MA;REEL/FRAME:003917/0324

Effective date: 19810724