US3362026A - Shortened log periodic antenna - Google Patents

Shortened log periodic antenna Download PDF

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Publication number
US3362026A
US3362026A US428331A US42833165A US3362026A US 3362026 A US3362026 A US 3362026A US 428331 A US428331 A US 428331A US 42833165 A US42833165 A US 42833165A US 3362026 A US3362026 A US 3362026A
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US
United States
Prior art keywords
dipole
extensions
log periodic
antenna
segments
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
US428331A
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English (en)
Inventor
Jr Valor C Smith
Chu Lan Jen
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.)
JEN CHU
Original Assignee
JEN CHU
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 JEN CHU filed Critical JEN CHU
Priority to US428331A priority Critical patent/US3362026A/en
Priority to SE774/66A priority patent/SE322565B/xx
Priority to GB2915/66A priority patent/GB1074415A/en
Application granted granted Critical
Publication of US3362026A publication Critical patent/US3362026A/en
Assigned to LIQUID CRYSTAL TECHNOLOGY, INC., reassignment LIQUID CRYSTAL TECHNOLOGY, INC., SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DAVIS, FREDERICK
Assigned to BAYBANK MIDDLESEX reassignment BAYBANK MIDDLESEX LICENSE (SEE DOCUMENT FOR DETAILS). Assignors: CHU ASSOCIATES, INC. A CORP. OF MA
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H01Q11/10—Logperiodic antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
    • H01Q21/22—Antenna units of the array energised non-uniformly in amplitude or phase, e.g. tapered array or binomial array

Definitions

  • the present invention relates to log periodic antennas and, more generically, to antennas of the type in which an array of dipoles of different dimensions is employed for directional and other radiational characteristics.
  • a further object of the invention is to provide a new and improved antenna structure of more general utility, as well.
  • a pair of substantially parallel longitudinal strip feed conductors is shown at 1-1' having longitudinally spaced transversely extending (preferably orthogonally to the longitudinal direction of the conductors 1-1) dipole extensions 2, 2, 4, 4, 6, 6 that, in accordance with conventional practice, would be of successively decreasing lengths and separations in accordance with the log periodic law, or some other desired law of variation.
  • the norm-ally required length of the dipole elements is considerably shortened by dividing the dipole extensions into segments supported in-line by insulating separators, In connection with the oppositely extending pair of transverse dipole extensions 2 and 2', for example, these are respectively shown divided into segments 20-20" and -30 connected by insulating spacers 21 and 31.
  • ditferent values of capacitance can be loaded upon the elements and can thus be appropriately tuned with the inductance provided by the jumpers 5 and 5, and the segments 20-20 and 30-30, to produce resonance equivalent to that of a much longer dipole pair.
  • capacitance as by using successively fewer and/or shorter conductors (shown as two at the ends of the elements 4-4 and one at the ends of the elements 6 and 6), and by appropriate orientation of these elements, such as the acute angle convergence orientation of the single elements at the ends of the dipoles 6 and 6', such tuning may be effected in accordance with the log periodic law, or any other desired law.
  • An antenna having, in combination, a pair of substantially parallel longitudinal conductors having opductors having oppositely transversely extending pairs of dipole extensions spaced longitudinally therealong, certain of the dipole extensions being divided into segments by insulator means with the segments being joined by inductive means, and capacitative means extending in the space between the outer ends of certain of the dipole extensions and the next longitudinally spaced pair of dipole extensions, the said certain divided extensions being tuned with the corresponding inductive and capacitative means to produce different elfective lengths of successive dipole extensions substantially in accordance with the log periodic law.

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Particle Accelerators (AREA)
US428331A 1965-01-27 1965-01-27 Shortened log periodic antenna Expired - Lifetime US3362026A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US428331A US3362026A (en) 1965-01-27 1965-01-27 Shortened log periodic antenna
SE774/66A SE322565B (OSRAM) 1965-01-27 1966-01-21
GB2915/66A GB1074415A (en) 1965-01-27 1966-01-21 Dipole arrays

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US428331A US3362026A (en) 1965-01-27 1965-01-27 Shortened log periodic antenna

Publications (1)

Publication Number Publication Date
US3362026A true US3362026A (en) 1968-01-02

Family

ID=23698433

Family Applications (1)

Application Number Title Priority Date Filing Date
US428331A Expired - Lifetime US3362026A (en) 1965-01-27 1965-01-27 Shortened log periodic antenna

Country Status (3)

Country Link
US (1) US3362026A (OSRAM)
GB (1) GB1074415A (OSRAM)
SE (1) SE322565B (OSRAM)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3543277A (en) * 1968-02-16 1970-11-24 Martin Marietta Corp Reduced size broadband antenna
US3550144A (en) * 1968-05-06 1970-12-22 Sylvania Electric Prod Antenna boom and feed line structure
US3573839A (en) * 1969-04-24 1971-04-06 James C Parker Jr Foreshortened log-periodic antenna employing inductively loaded and folded dipoles
US3653056A (en) * 1970-05-27 1972-03-28 Rca Corp Combined vhf-uhf dipole antenna array
US20070262912A1 (en) * 2006-03-31 2007-11-15 Eckwielen Bradley L Modular digital UHF/VHF antenna
US7626557B2 (en) 2006-03-31 2009-12-01 Bradley L. Eckwielen Digital UHF/VHF antenna
US20110148729A1 (en) * 2009-12-21 2011-06-23 Electronics And Telecommunications Research Institute Log periodic antenna

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3259904A (en) * 1963-11-21 1966-07-05 Blonder Tongue Elect Antenna having combined support and lead-in
US3276028A (en) * 1964-02-18 1966-09-27 Jfd Electronics Corp High gain backfire antenna array
US3277487A (en) * 1963-12-11 1966-10-04 Dorne And Margolin Inc Frequency independent (log periodic) monopole and dipole antennas

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3259904A (en) * 1963-11-21 1966-07-05 Blonder Tongue Elect Antenna having combined support and lead-in
US3277487A (en) * 1963-12-11 1966-10-04 Dorne And Margolin Inc Frequency independent (log periodic) monopole and dipole antennas
US3276028A (en) * 1964-02-18 1966-09-27 Jfd Electronics Corp High gain backfire antenna array

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3543277A (en) * 1968-02-16 1970-11-24 Martin Marietta Corp Reduced size broadband antenna
US3550144A (en) * 1968-05-06 1970-12-22 Sylvania Electric Prod Antenna boom and feed line structure
US3573839A (en) * 1969-04-24 1971-04-06 James C Parker Jr Foreshortened log-periodic antenna employing inductively loaded and folded dipoles
US3653056A (en) * 1970-05-27 1972-03-28 Rca Corp Combined vhf-uhf dipole antenna array
US20070262912A1 (en) * 2006-03-31 2007-11-15 Eckwielen Bradley L Modular digital UHF/VHF antenna
US20080309573A9 (en) * 2006-03-31 2008-12-18 Eckwielen Bradley L Modular digital UHF/VHF antenna
US7626557B2 (en) 2006-03-31 2009-12-01 Bradley L. Eckwielen Digital UHF/VHF antenna
US7911406B2 (en) 2006-03-31 2011-03-22 Bradley Lee Eckwielen Modular digital UHF/VHF antenna
US20110148729A1 (en) * 2009-12-21 2011-06-23 Electronics And Telecommunications Research Institute Log periodic antenna
US8766866B2 (en) * 2009-12-21 2014-07-01 Electronics And Telecommunications Research Institute Log periodic antenna

Also Published As

Publication number Publication date
SE322565B (OSRAM) 1970-04-13
GB1074415A (en) 1967-07-05

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Legal Events

Date Code Title Description
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