US3805269A - Diverse type dipole antennas on common mount - Google Patents

Diverse type dipole antennas on common mount Download PDF

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Publication number
US3805269A
US3805269A US00261973A US26197372A US3805269A US 3805269 A US3805269 A US 3805269A US 00261973 A US00261973 A US 00261973A US 26197372 A US26197372 A US 26197372A US 3805269 A US3805269 A US 3805269A
Authority
US
United States
Prior art keywords
antenna
transmission lines
sets
linear conductors
parallel
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
US00261973A
Other languages
English (en)
Inventor
K Fujimoto
N Suyama
Y Hiroi
T Ogawa
T Kobayashi
H Ito
H Haruki
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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
Priority claimed from JP1971050487U external-priority patent/JPS5222914Y2/ja
Priority claimed from JP5048471U external-priority patent/JPS489032U/ja
Priority claimed from JP5048571U external-priority patent/JPS489035U/ja
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Application granted granted Critical
Publication of US3805269A publication Critical patent/US3805269A/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
    • H01Q11/00—Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
    • H01Q11/12—Resonant antennas
    • H01Q11/14—Resonant antennas with parts bent, folded, shaped or screened or with phasing impedances, to obtain desired phase relation of radiation from selected sections of the antenna or to obtain desired polarisation effect
    • H01Q11/16—Resonant antennas with parts bent, folded, shaped or screened or with phasing impedances, to obtain desired phase relation of radiation from selected sections of the antenna or to obtain desired polarisation effect in which the selected sections are collinear
    • 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
    • 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
    • H01Q9/06—Details
    • H01Q9/065—Microstrip dipole antennas

Definitions

  • ABSTRACT An antenna means comprising a linear element of a conductor having a length sufficiently shorter than a half wavelength and a plurality of parallel two-wire type distributed constants transmission lines shortcircuited at the free end thereof, said transmission lines being sequentially arranged along the linear conductor element and connected to the same element, whereby compensation of the impedance characteristics of the antenna is achieved without decreasing the antenna efficiency.
  • FIG. 2 1 Claim, 14 Drawing Figures ATENTEUAPR 16 um SHEET 1 OF 4 FIG. 2
  • This invention relates to an antenna means of comparatively small size, particularly to such a means designed to have well compensated impedance characteristics and yet to maintain good antenna efficiency.
  • small linear antennas the length of which is sufficiently shorter than a half wavelength, have an impedance characteristics in which the resistive component is comparatively small and the capacitive component iis comparatively large. Therefore, the mismatch loss with a receiver is accordingly large.
  • an inductance of concentrated constants (or a coil) has been attached to the antenna at the intermediate portion or at the driving terminals thereof.
  • Such a loading has caused a decrease in the antenna efficiency due to a loss in the inductance (coil).
  • the radiation impedance of the antenna is usually small.
  • An object of this invention is to remove the abovementioned drawbacks of a small antenna by loading it with inductances of distributed constants.
  • Another object of this invention is to provide a small antenna which has a long life and can be easily handled.
  • a further object of this invention is to provide a small antenna which can be easily formed as a composite antenna.
  • the antenna of this invention comprises an aligned series of linear conductors the total length of which is substantially shorter than a half wavelength in the operating frequency band and a pluralityof parallel two-wire type distributed constants transmission lines short-circuited at one end thereof, said transmission lines being connected between two adjacent conductors of said series of linear conductorsat the other end thereof.
  • FIG. 1 is a diagram of a fundamental two-wire distributed constants transmission line
  • FIGS. 2, 3, 4 and 5 are schematic diagrams of the antenna of this invention shown in various forms
  • FIG. 6 is a chart showing comparison of the impedance relations between the antennas of this invention and of the conventional one;
  • FIGS. 7, 8 and 9 are schematic diagram of modified forms of the antenna of this invention.
  • FIGS. 10a, 10b and 100 are views relating to a practical embodiment of this invention.
  • FIGS. 11 and 12 are views of another embodiment of this invention.
  • the impedance of the line at the sending end a,a' contains an inductive component Z expressed by the following formula:
  • FIG. 2 schematically shows anembodiment of the antenna of this invention, in which a plurality of shortcircuited transmission-lines 2 as shown in FIG. 1 are successively loaded to an antenna element 1.
  • the inductive component of each transmission line 2 is added in series to the impedance of the antenna element 1 which has a large capacitive component. Further, the radiation current is superposed to the transmission lines 2.
  • FIGS. 3 and 4 are schematic diagrams of other embodiments of this invention.
  • the embodiment shown in FIG. 3 has a plurality of folded transmission lines 3, while the one shown in FIG. 4 has curved transmission lines 4. I
  • the antenna element is loaded with inductive components of small loss and the antenna efficiency is not deteriorated. Further, as the radiation current is superposed to the loading transmission lines, the effective length of the antenna is equivalently increased, the radiation resistance being thereby multiplied eight to ten-fold. Thus, a small antenna with which the loss due to the mismatching thereof with the receiver in the resonant state is minimized, is realized.
  • the chart of FIG. 6 shows impedance characteristics (A) for an antenna of this invention of 60 cm in length characteristics (B) for a helical antenna of corresponding length.
  • the antenna efficiency can be increased by changing the length orthe characteristic impedance of the loading transmission lines according to the respective loading positions, or by changing the spaces between adjacent transmission lines.
  • impedance Z can be changed by varying the value of the characteristic impedance W, or the length l of the line.
  • the lengths (l l of respective transmission lines are changed while the spaces (w) are equal.
  • the embodiment shown in FIG. 8 is loaded with transmission lines of the same length (l) but differently spaced (w w
  • FIG. 9 shows an embodiment in which the characteristic impedances (W W of the loading transmission lines are varied depending on the loading position along The antenna. In FIGS. 7 to 9, distance 2h represents the total length of the antenna.
  • the antenna of this invention is important for the antenna of this invention to be provided in such a form that simple construction, stable characteristics and easy handling of the antenna are ensured.
  • An example of such an antenna is described hereunder.
  • a supporting cylinder 11 is made of a dielectric material and provided with a hole 15 which serves as the outlet for feeders.
  • a conductive material in the pattern of antenna el ements l3 loaded with short-circuited transmission lines 14 are deposited, by known printed-circuit technique, on an elastic sheet 12 of an insulating material.
  • This elastic sheet 12 with the conductive pattern of the antenna deposited thereon is placed within the supporting cylinder 11 so that the sheet 12 is pressed against the inner wall of the cylinder 11 by its own elasticity.
  • the sheet 22 is assuredly held by the cylinder 11 as shown in FIG. 100.
  • a cylindrical tube is used in the above embodiment, it will be understood that similar effects are achieved using a tube having a square section.
  • the antenna of this invention fabricated in such a form as described above has the following advantages. Namely, antennas of any complicated pattern can be easily fabricated in mass-production scale with very accurate dimensions and good uniformness. Further, as the antenna element is protected by the dielectric cylinder, it is little affected by weather or salty wind and also hardly suffers mechanical damage. Thus, a long operation life can be expected. Moreover, the antenna assembly described is very simple in construction, as the printed sheet is certainly within the supporting cylinder with its own elasticity and no fixing means is required. Thus, the prduction cost is accordingly low.
  • the antenna 20 comprises support 21 which may be, for example, a square bar of a dielectric material such as polys tyrole, an antenna element 23 which may be a series of conductive strips, for example, of metal foil attached to the support 21 along a longitudinal edge thereof, and compensating elements 22 which are a plurality of parallel two lines of conductor attached to the support 21, one end of the two lines being connected with the antenna element and the other end being short-circuited.
  • the support 21 is provided with a hole along the longitudinal axis thereof at the center portion of the square section.
  • This hole serves to support the rod antenna 24 which operates at a frequency band different from that for the first antenna 20. Further, as both antennas can be driven through a common feeding point, a composite antenna of reduced size which may appear to be a single antenna is obtained. Moreover, the second or rod antenna 24 contributes to increase the mechanical strength of the composite antenna.
  • An antenna means comprising two sets of linear conductors aligned in a plain dipole antenna fashion and having the total length substantially shorter than a half wavelength in the operation frequency band, the linear conductors of each set of said two sets of linear conductors being spaced at intervals corresponding to a fraction of the operating wavelength,
  • a plurality of parallel two-wire type distributed constants transmission lines having one end thereof short-circuited, said transmission lines being connected between two adjacent conductors of each set of said two sets of linear conductors at the other end of said transmission lines, said plurality of parallel two-wire type transmission lines being perpendicular to the axis of said two sets of linear conductors and having a predetermined impedance characteristic
  • said antenna means constitutes a part of a composite antenna.

Landscapes

  • Details Of Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
US00261973A 1971-06-14 1972-06-12 Diverse type dipole antennas on common mount Expired - Lifetime US3805269A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP1971050487U JPS5222914Y2 (enrdf_load_stackoverflow) 1971-06-14 1971-06-14
JP5048471U JPS489032U (enrdf_load_stackoverflow) 1971-06-14 1971-06-14
JP5048571U JPS489035U (enrdf_load_stackoverflow) 1971-06-14 1971-06-14

Publications (1)

Publication Number Publication Date
US3805269A true US3805269A (en) 1974-04-16

Family

ID=27293970

Family Applications (1)

Application Number Title Priority Date Filing Date
US00261973A Expired - Lifetime US3805269A (en) 1971-06-14 1972-06-12 Diverse type dipole antennas on common mount

Country Status (5)

Country Link
US (1) US3805269A (enrdf_load_stackoverflow)
CA (1) CA973261A (enrdf_load_stackoverflow)
DE (1) DE2228799A1 (enrdf_load_stackoverflow)
FR (1) FR2141870B1 (enrdf_load_stackoverflow)
GB (1) GB1367232A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4008477A (en) * 1975-06-25 1977-02-15 The United States Of America As Represented By The Secretary Of Commerce Antenna with inherent filtering action
US4038662A (en) * 1975-10-07 1977-07-26 Ball Brothers Research Corporation Dielectric sheet mounted dipole antenna with reactive loading
US4498085A (en) * 1982-09-30 1985-02-05 Rca Corporation Folded dipole radiating element
US4513292A (en) * 1982-09-30 1985-04-23 Rca Corporation Dipole radiating element
US5510804A (en) * 1994-10-03 1996-04-23 Ford Motor Company F-shaped three element dipole antenna for motor vehicles
US20110006957A1 (en) * 2009-07-13 2011-01-13 Physical Sciences, Inc. Method and apparatus for a high-performance compact volumetric antenna

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4654668A (en) * 1985-04-03 1987-03-31 The Singer Company Microstrip circuit temperature compensation with stub means
GB2322011A (en) * 1997-02-04 1998-08-12 Ico Services Ltd Antenna and fabrication method
GB2330951B (en) * 1997-11-04 2002-09-18 Nokia Mobile Phones Ltd Antenna

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1987780A (en) * 1928-08-27 1935-01-15 Latour Marius Antenna system
US2380333A (en) * 1942-12-31 1945-07-10 Gen Electric High frequency antenna
US2682608A (en) * 1950-03-16 1954-06-29 Rca Corp Indoor television antenna
US3231894A (en) * 1960-06-23 1966-01-25 Sony Corp Zigzag antenna
US3611397A (en) * 1969-09-12 1971-10-05 Aerial Electronics Corp Folded dipole with end-loading elements
US3689929A (en) * 1970-11-23 1972-09-05 Howard B Moody Antenna structure

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1987780A (en) * 1928-08-27 1935-01-15 Latour Marius Antenna system
US2380333A (en) * 1942-12-31 1945-07-10 Gen Electric High frequency antenna
US2682608A (en) * 1950-03-16 1954-06-29 Rca Corp Indoor television antenna
US3231894A (en) * 1960-06-23 1966-01-25 Sony Corp Zigzag antenna
US3611397A (en) * 1969-09-12 1971-10-05 Aerial Electronics Corp Folded dipole with end-loading elements
US3689929A (en) * 1970-11-23 1972-09-05 Howard B Moody Antenna structure

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4008477A (en) * 1975-06-25 1977-02-15 The United States Of America As Represented By The Secretary Of Commerce Antenna with inherent filtering action
US4038662A (en) * 1975-10-07 1977-07-26 Ball Brothers Research Corporation Dielectric sheet mounted dipole antenna with reactive loading
US4498085A (en) * 1982-09-30 1985-02-05 Rca Corporation Folded dipole radiating element
US4513292A (en) * 1982-09-30 1985-04-23 Rca Corporation Dipole radiating element
US5510804A (en) * 1994-10-03 1996-04-23 Ford Motor Company F-shaped three element dipole antenna for motor vehicles
US20110006957A1 (en) * 2009-07-13 2011-01-13 Physical Sciences, Inc. Method and apparatus for a high-performance compact volumetric antenna
US8810466B2 (en) * 2009-07-13 2014-08-19 Physical Sciences, Inc. Method and apparatus for a high-performance compact volumetric antenna

Also Published As

Publication number Publication date
FR2141870B1 (enrdf_load_stackoverflow) 1977-12-23
FR2141870A1 (enrdf_load_stackoverflow) 1973-01-26
CA973261A (en) 1975-08-19
DE2228799A1 (de) 1972-12-21
GB1367232A (en) 1974-09-18

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