EP0014635B1 - Source rayonnante à cavité ouverte excitée par un dipole - Google Patents

Source rayonnante à cavité ouverte excitée par un dipole Download PDF

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Publication number
EP0014635B1
EP0014635B1 EP80400139A EP80400139A EP0014635B1 EP 0014635 B1 EP0014635 B1 EP 0014635B1 EP 80400139 A EP80400139 A EP 80400139A EP 80400139 A EP80400139 A EP 80400139A EP 0014635 B1 EP0014635 B1 EP 0014635B1
Authority
EP
European Patent Office
Prior art keywords
radiating
source according
radiating source
cavity
dipole
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
Application number
EP80400139A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0014635A1 (fr
Inventor
Albert Dupressoir
Claude Bloch
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.)
Thales SA
Original Assignee
Thomson CSF SA
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 Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0014635A1 publication Critical patent/EP0014635A1/fr
Application granted granted Critical
Publication of EP0014635B1 publication Critical patent/EP0014635B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/10—Resonant slot antennas
    • H01Q13/18—Resonant slot antennas the slot being backed by, or formed in boundary wall of, a resonant cavity ; Open cavity antennas

Definitions

  • the present invention relates to a radiating source with an open cavity excited by a dipole.
  • This source preferably operates in the microwave domain and can be used as a primary source or as a radiating element of a network antenna.
  • Such a source with a cylindrical open cavity is constituted by a radiating dipole, placed inside a cylindrical metal base of circular cross section. Due to the phenomena of excitation of certain modes and of reflection in the cavity, the radiation diagram of such a source, in the site plane, is constituted by concentric isonlevel circles until a gain reduction of 10 dB, at beyond which the circles give way to concentric ellipses. This lack of symmetry of the radiated diagram with respect to the direction of propagation limits the bandwidth of the usable frequencies.
  • the object of the invention is to define a radiating source with an open cylindrical cavity excited by a dipole, having a significant widening of the frequency band usable compared to the sources of the prior art.
  • a source according to the invention, then presents a radiation pattern of increased directivity and for which the symmetry defects are eliminated.
  • the radiating source with a cylindrical cavity open on the side of the emitted radiation, excited by a dipole (2) placed inside the radiating opening of circular cross section and whose strands (4) are deposited according to the direction of a diameter of the opening is such that the opening has at its periphery two projections (10) advancing in the direction of the radiation emitted, and opposite over a diameter of the opening perpendicular to the strands (4) of the dipole (2).
  • the radiating source comprises a cap covering the opening -of the cavity which contributes to increasing the directivity of the radiation diagram.
  • Figure 1 shows a radiating source with open cavity (1) of the prior art, metallic and of cylindrical shape, excited by a dipole (2) produced on a printed circuit (3), the assembly being connected to a system of conventional food (5).
  • FIG. 2 represents a view, from the side of the emitted radiation, of a radiating source (1) according to the invention.
  • the opening of the cavity (1) has at its periphery two projections (10), advancing in the direction of the radiation emitted, and opposite over a diameter of the opening perpendicular to the strands (4) of the dipole (2).
  • the two projections (10) of the cavity (1) are diametrically opposite points, obtained by the intersection with the cylindrical opening of two concurrent oblique surfaces symmetrical with respect to the normal diameter of the strands (4) of the dipole (21).
  • the strands 4 of the radiating dipole 2 are obtained by photoengraving on a dielectric plate 3.
  • a cylindrical strapping 7 of dielectric is placed inside the cylindrical cavity 1. To fix the cavity 1 to its supply circuit, and orient the dipole according to the chosen radiation direction, we have made two slots 8 in the closed part 9 of the cavity, through which two screws 11 pass.
  • the impedance of the cavity is adapted to the impedance of the air, thus allowing almost all of the energy to be radiated outside.
  • FIG. 3 is another embodiment of the invention, comprising a conventional radiating dipole 6, half-wave or whole wave.
  • the widening of the operating band of the radiating source is obtained on the one hand thanks to an improvement in the symmetry of the radiation diagram with respect to the direction of propagation, and on the other hand thanks to an increase in the directivity of this diagram.
  • the symmetry of the radiation pattern of the source is improved by the opening of the cavity, the latter having two diametrically opposite projections, as just described.
  • the increase in directivity is obtained by the addition of a hollow dielectric cap covering the opening of the cavity.
  • Figure 4 shows a tear from a source according to the invention. It is covered by a cap 12, in dielectric, hollow, frustoconical having an acute solid angle according to the direction of propagation of the radiation on emission and fitting onto the projections 10. The thickness of the cap decreases according to the same direction of propagation.
  • the cavity is supplied in its longitudinal axis of symmetry by a coaxial line 13.
  • the adaptation of the cavity 1 to the supply line 13 is carried out by a quarter wave transformer and balun, obtained from a coaxial line quarter wave 14 on the outer conductor of which two metallization spares 16 have been made.
  • the spares 16, symmetrical with respect to the longitudinal axis of the cavity, are included in the normal plane of the median plane comprising the strands 4 of the dipole deposited by photogravure on a dielectric plate 3.
  • the central conductor 17 of the coaxial line is a metal wire sheathed with dielectric 18. To perfect the agreement, a low-impedance ring not shown in the figure can be placed against the external wall of the coaxial line.
  • FIG. 5 is a cutaway from another radiating source 1 according to the invention, of metallized dielectric cylindrical base 19.
  • the metallization 21 of the base 19 is obtained by photoengraving.
  • the assembly of the dielectric cap 12 with the dielectric base 19 is done by an interlocking 20 of the pa, bottom tie of the cap in the base.
  • the strands 4 of the dipole are deposited by photoengraving on the dielectric base 19.
  • This embodiment of sources with metallized dielectric base has the advantage of a lower cost especially for the production in large number of sources.
  • the electromagnetic performance is the same as for metal cavity sources.
  • FIG. 6 shows another type of cavity radiating source with a hollow dielectric cap, composed of coaxial cylindrical sections of decreasing diameter according to the direction of propagation on emission, and of different heights. The thickness of each cylindrical dielectric section also decreases according to the direction of propagation.
  • FIG. 7 shows another embodiment of a radiating source according to the invention, for which the open cavity has two opposite symmetrical slots 110 placed on a diameter perpendicular to the strands 4 of the dipole 2.
  • the cavity 1 can be made of metal or of metallized dielectric, as previously described.
  • a radiating source operating in the C band with a frequency of 5,450 to 5,850 MHz, the following dimensions were obtained; diameter of the cavity between one to three wavelengths X depending on the type of dipole used; base height equal to half wavelength; optimal height of the points equal to ⁇ l5.
  • the width of the slots is X / 2 and the height of ⁇ / 10.
  • its dimensions are obtained by homothety from the previous dimensions.
  • FIG. 8 schematically represents an example of array antenna where the elementary sources are produced according to the invention. They are arranged circularly on a metal support 23. All the dipoles 2 are oriented in the same direction which is that of the polarization of the antenna.
  • a radiating microwave source with an open cavity excited by a dipole the directivity and symmetry qualities of the radiation diagram with respect to the direction of propagation allow a frequency band of sound wider operation than that of radiating sources with open cavity excited by a dipole of the prior art.

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  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Waveguide Aerials (AREA)
  • Details Of Aerials (AREA)
EP80400139A 1979-02-02 1980-01-29 Source rayonnante à cavité ouverte excitée par un dipole Expired EP0014635B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7902767 1979-02-02
FR7902767A FR2448230A1 (fr) 1979-02-02 1979-02-02 Source rayonnante a cavite ouverte excitee par un dipole

Publications (2)

Publication Number Publication Date
EP0014635A1 EP0014635A1 (fr) 1980-08-20
EP0014635B1 true EP0014635B1 (fr) 1983-03-09

Family

ID=9221552

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80400139A Expired EP0014635B1 (fr) 1979-02-02 1980-01-29 Source rayonnante à cavité ouverte excitée par un dipole

Country Status (4)

Country Link
US (1) US4313122A (hu)
EP (1) EP0014635B1 (hu)
DE (1) DE3062244D1 (hu)
FR (1) FR2448230A1 (hu)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10985454B2 (en) 2017-06-15 2021-04-20 Commscope Technologies Llc Base station antennas having bottom end caps with angled connector ports

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3129425A1 (de) * 1981-07-25 1983-02-10 Richard Hirschmann Radiotechnisches Werk, 7300 Esslingen Mikrowellenantenne fuer zirkularpolarisation
FR2538624A1 (fr) * 1982-12-23 1984-06-29 Thomson Csf Source rayonnante a cavite ouverte et a polarisation commandee et antenne reseau comportant de telles sources
US4878059A (en) * 1983-08-19 1989-10-31 Spatial Communications, Inc. Farfield/nearfield transmission/reception antenna
NL8401335A (nl) * 1984-04-26 1985-11-18 Philips Nv Ontvanginrichting voor toepassing in een tv front end.
US5339097A (en) * 1986-10-21 1994-08-16 Grant Alan H Computer keyboard
US5416498A (en) * 1986-10-21 1995-05-16 Ergonomics, Inc. Prehensile positioning computer keyboard
US4897664A (en) * 1988-06-03 1990-01-30 General Dynamics Corp., Pomona Division Image plate/short backfire antenna
IT1236669B (it) * 1989-11-07 1993-03-25 Antenna radar direttiva, a compressione di energia elettromagnetica, per telecomunicazione
JP7298517B2 (ja) * 2020-03-05 2023-06-27 株式会社デンソー 電子装置

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2632852A (en) * 1945-09-17 1953-03-24 Sichak William Wave guide feed
US2719230A (en) * 1952-05-10 1955-09-27 Gen Electric Dual frequency antenna
FR1091260A (fr) * 1953-01-09 1955-04-08 Gen Electric Co Ltd Antenne à cornet
US3381371A (en) * 1965-09-27 1968-05-07 Sanders Associates Inc Method of constructing lightweight antenna
US3413639A (en) * 1967-07-26 1968-11-26 Shepard S. Kanarek Radio position plotter
US3534376A (en) * 1968-01-30 1970-10-13 Webb James E High impact antenna
US3740754A (en) * 1972-05-24 1973-06-19 Gte Sylvania Inc Broadband cup-dipole and cup-turnstile antennas
US3781898A (en) * 1972-07-03 1973-12-25 A Holloway Spiral antenna with dielectric cover
US3778838A (en) * 1972-12-01 1973-12-11 Hughes Aircraft Co Circular symmetric beam forming apparatus
DE2542213C3 (de) * 1975-09-22 1978-10-26 Siemens Ag, 1000 Berlin Und 8000 Muenchen Antennenanlage
US4183027A (en) * 1977-10-07 1980-01-08 Ehrenspeck Hermann W Dual frequency band directional antenna system

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Antenna Engineering Handbook Ch.8 par.8-1,2. Henry Jasik. McGraw-Hill 1961 *
Radar Handbook.Merril Skolnik 11-5, 11-68 McGraw-Hill 1970 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10985454B2 (en) 2017-06-15 2021-04-20 Commscope Technologies Llc Base station antennas having bottom end caps with angled connector ports

Also Published As

Publication number Publication date
FR2448230A1 (fr) 1980-08-29
DE3062244D1 (en) 1983-04-14
FR2448230B1 (hu) 1983-09-16
US4313122A (en) 1982-01-26
EP0014635A1 (fr) 1980-08-20

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