EP0067753A1 - Source rayonnante hyperfréquence à cavités ouvertes excitée par deux dipoles orthogonaux - Google Patents

Source rayonnante hyperfréquence à cavités ouvertes excitée par deux dipoles orthogonaux Download PDF

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Publication number
EP0067753A1
EP0067753A1 EP82400984A EP82400984A EP0067753A1 EP 0067753 A1 EP0067753 A1 EP 0067753A1 EP 82400984 A EP82400984 A EP 82400984A EP 82400984 A EP82400984 A EP 82400984A EP 0067753 A1 EP0067753 A1 EP 0067753A1
Authority
EP
European Patent Office
Prior art keywords
cavity
dipole
source according
plates
dipoles
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.)
Withdrawn
Application number
EP82400984A
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German (de)
English (en)
French (fr)
Inventor
Albert Dupressoir
Georges Devis
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 EP0067753A1 publication Critical patent/EP0067753A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • H01Q13/02—Waveguide horns
    • H01Q13/025—Multimode horn antennas; Horns using higher mode of propagation
    • H01Q13/0258—Orthomode horns
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
    • H01Q5/45—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements using two or more feeds in association with a common reflecting, diffracting or refracting device

Definitions

  • the present invention relates to a radiating source with open cavities, excited by two orthogonal dipoles and preferably operating in the microwave domain.
  • This source can be used as the primary excitation source of a focusing optical system or as a radiating element of a network antenna, whether the network is linear plane or disposed on any surface.
  • FIG. 1 represents a particular embodiment of such a radiating source described in the review "Microwave Journal" of the month of May 1977, pages 47 to 49, whose open cavity 1 is of revolution (cylindrical), excited by two dipoles 2 and 3 arranged in a cross and comprising a planar element 4 placed in front of the radiating opening 5 to increase the directivity.
  • the object of the invention is to define a radiating source with open cavities, excited by two cross dipoles and operating in two different frequency bands.
  • this source comprises two concentric cavities, each being excited by one of the dipoles and tuned to the central frequency of the operating frequency band of its respective exciting dipole, these two cavities, whose respective openings allowing the radiation of the waves emitted. are placed on the same side, being further arranged one in the other so that the cavity placed inside the other operates in the highest frequency band.
  • the frequency difference between the two operating bands of the source is greater than the ratio of 1 to 3.
  • FIGS. 2 and 4 are exploded views of these two embodiments.
  • FIG. 2 shows an exploded view of a first embodiment of a radiating source, comprising two open cavities 6 and 7, excited by their respective dipoles 18 and 21, the external cavity 6 operating in the lowest frequency band and the inner cavity 7 operating in the highest frequency band.
  • the outer cavity 6 is fully reflective for the wave emitted by its exciting dipole 21 and has an opening 8 on the side of the emitted radiation, while the inner cavity 7 is reflective by the wave emitted by its exciting dipole 18 but semi-transparent for the radiated wave for the dipole 18.
  • the cross sections of the cavities are square.
  • the external cavity 6 is produced either by thin metal plates, of light alloy for example obtained by mechanical brazing in a salt bath, or by metallized dielectric material plates.
  • the cross section of this cavity 6 is square with the edges cut along the cut 9 for reasons of attachment to the top of the main reflector of a Cassegrain system for example, the source thus produced would constitute the radiating assembly primary.
  • the ears 10 are also used for this fixing.
  • the cross section of the cavity may have another shape which will be specified later.
  • the open interior cavity 7 has its bottom 11 and two side walls parallel to each other, 12 and 13 semi-transparent, and two other walls 14 and 15 fully reflecting, the opening 16 being also on the side of the radiation emitted therefore of the same side that the opening 8 of the cavity 6.
  • Its cross section has substantially the same shape as that of the outer cavity 6, with dimensions corresponding to its own operating frequency band, but does not have cut edges.
  • This cavity 7 is produced by assembling five plates of thin dielectric material, constituting the bottom 11 and the four walls 12 to 15.
  • the plates constituting the walls 12 and 13 as well as the bottom 11 are partially metallized, according to parallel ribbons 16, only on the internal faces of the walls and of the bottom of the cavity 7.
  • the other two plates are fully metallized on the internal faces of the walls 14 and 15.
  • the parallel metallic ribbons deposited on the walls and the bottom of the internal cavity 7 constitute a microwave network whose characteristics (network pitch, thickness of the ribbons) can be adapted to make this network equivalent to a short-circuit plane for a wave polarized parallel to the direction of these ribbons and transparent for a wave whose direction of polarization is perpendicular to the ribbons of the network.
  • this interior cavity 7 is excitable by a dipole emitting a wave whose direction of polarization is parallel to that of the metallic ribbons 16 constituting its two walls 12 and 13 and its bottom 11. This is why we will excite this cavity 7 by a dipole 18 which, in FIG. 2, is produced on a dielectric plate 19, its strands 20 parallel to the strips 16, being photo-etched on the latter.
  • this dipole 21 is produced by photoengraving on a wafer 23 of dielectric material but it . can be made otherwise, just like dipole 18, by metal strands for example.
  • the radiating strands 20 and 22 of each of the respective dipoles 18 and 21 have a length equal to the half-wavelength corresponding to the central frequency of their operating bands.
  • the dipoles 18 and 21 are supplied by semi-rigid coaxial lines comprising a symmetrizing system which allows the passage from the coaxial, anti-symmetrical line, to the two-wire supply line, symmetrical.
  • the interior cavity 7 has a volume perfectly defined by its walls and the exterior cavity 6 has a volume equivalent to that defined by its exterior faces.
  • the position of the exciter dipoles is adjustable.
  • these dipoles placed in two planes normal to the longitudinal axis 4 of the radiating system and centered on this axis have a position relative to the short-circuit planes, which constitute the bottoms of the cavities with which they are associated, adjustable as a function of these requested radio characteristics.
  • the microwave source is a primary source which does not radiate directly, i.e. illuminating a focusing optical system, the two laws of radiation of the dipoles must be as close as possible to each other, therefore their centers of phase combined.
  • the plates 19 and 23 carrying the dipoles 18 and 21 are slid into slots made in the side walls 12 to 15 of the internal cavity 7, then fixed by gluing, the electrical continuity between the different metallized parts being provided by tin soldering at low heating temperatures for example.
  • the interior cavity 6 is fixed to the cavity 7 by bonding the four dielectric plates to the internal walls of the cavity 6, by means of an epoxy resin for example.
  • a radome 24 is placed over the opening of the source.
  • Figure 3 showing a side view of a dual-band source according to the invention. It can be made of a glass fiber fabric material impregnated with epoxy resin and of low thickness.
  • the frequency difference between the two operating bands being greater than the ratio of 1 to 3
  • the dimensions of the external cavity 6 are as follows: 1.3 ⁇ . and 1.5 ⁇ . for the sides of its cross section and 0.55 ⁇ for the depth, - ⁇ . being the wavelength at the center frequency of the operating band -.
  • the width separating two metal strips 16 from the side faces or from the bottom of the interior cavity 7 is equal to ⁇ . / 20 and the thickness of the radome 24 is approximately 0.3 mm.
  • FIG. 4 shows a second embodiment of a dual-band radiating source with concentric open cavities, according to the invention.
  • the external 25 and internal 26 cavities are produced by blocks of dielectric material partially or entirely metallized according to the faces, and produced by molding.
  • the external cavity 25 is constituted by a dielectric block entirely metallized on five external walls, according to a conventional photoengraving method for example, and comprising a hollowed out part 27 whose volume is substantially equal to that of the internal cavity 26.
  • This cavity 26 is constituted by a dielectric block, the bottom 28 and two lateral walls parallel to one another 29 and 30, and perpendicular to the bottom 18, are carriers of networks of metallic ribbons 31 parallel, the other two walls 32 and 33, parallel between they and perpendicular to the bottom 28 are fully metallized, by photoengraving for example.
  • This block has two channels 34 symmetrical with respect to the longitudinal axis ⁇ 'of the cavities. In these two channels are fixed two metal strands 35 serving as an excitation dipole to the external cavity 25. The excitation dipole for the internal cavity 26 is produced by two metal strands 36, perpendicular to the previous strands 35 and entirely contained in this cavity.
  • an orifice 37 is made on the front face of the block constituting the cavity 26, along the axis ⁇ 'so as to be able to weld the strands of the dipoles to the supply coaxials; this orifice 37 can moreover be closed by a plug made of dielectric material.
  • the strands 36 of the exciter dipole of the inner cavity 26 are held inside thereof by gluing while the strands 35 of the exciter dipole of the outer cavity 25 are partly held in the dielectric block of the cavity 26, by bonding, for example, and in part thanks to grooves 38 placed in the dielectric block constituting the cavity 25 and on the other hand to other grooves 39 placed in a dielectric cover 40, which is received in the opening of the outer cavity 25.
  • the latter has a recess for housing this cover, between the opening of the recessed part 27 and the opening of the outer cavity itself.
  • the length L of the internal cavity 26 - or dimension along the axis A '- is greater than the length L' of the hollowed out part 27 of the external cavity 25, so the cover 40 has a recess 41 formed in the extension of the part 27.
  • the cavity 26 is located inside the cavity 25, embedded in the recessed part 27 and in the hollow 41 of the cover 40.
  • a microwave radiating source comprising two open cavities excited by two orthogonal dipoles and operating in two different frequency bands.
  • This source can be used in a network antenna.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Aerials With Secondary Devices (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
EP82400984A 1981-06-05 1982-05-27 Source rayonnante hyperfréquence à cavités ouvertes excitée par deux dipoles orthogonaux Withdrawn EP0067753A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8111219 1981-06-05
FR8111219A FR2507392A1 (fr) 1981-06-05 1981-06-05 Source rayonnante hyperfrequence a cavites ouvertes excitee par deux dipoles orthogonaux

Publications (1)

Publication Number Publication Date
EP0067753A1 true EP0067753A1 (fr) 1982-12-22

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EP82400984A Withdrawn EP0067753A1 (fr) 1981-06-05 1982-05-27 Source rayonnante hyperfréquence à cavités ouvertes excitée par deux dipoles orthogonaux

Country Status (3)

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US (1) US4529989A (index.php)
EP (1) EP0067753A1 (index.php)
FR (1) FR2507392A1 (index.php)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU603441B2 (en) * 1987-05-11 1990-11-15 Hazeltine Corporation Multimode omniantenna with flush mount

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5003321A (en) * 1985-09-09 1991-03-26 Sts Enterprises, Inc. Dual frequency feed
SE505796C2 (sv) * 1996-01-19 1997-10-13 Ericsson Telefon Ab L M Dubbelt polariserad antenn

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2398096A (en) * 1940-12-12 1946-04-09 Rca Corp Two frequency electromagnetic horn radiator
FR74355E (fr) * 1951-05-23 1960-11-07 Int Standard Electric Corp Système de transmission pour haute fréquence
FR1286970A (fr) * 1960-03-09 1962-03-09 Bendix Corp Système de pavillon à double voie de fréquences
US4130823A (en) * 1977-08-05 1978-12-19 The United States Of America As Represented By The Secretary Of The Navy Miniature, flush mounted, microwave dual band cavity backed slot antenna

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2364371A (en) * 1940-08-31 1944-12-05 Rca Corp Double polarization feed for horn antennas
BE450231A (index.php) * 1942-06-19
GB718828A (en) * 1952-01-21 1954-11-24 Gen Electric Co Ltd Improvements in or relating to apparatus of the kind including a waveguide
FR71961E (fr) * 1957-02-15 1960-03-15 Int Standard Electric Corp Systèmes de réception de signaux radioélectriques en diversité
US3922683A (en) * 1974-06-24 1975-11-25 Hazeltine Corp Three frequency band antenna

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2398096A (en) * 1940-12-12 1946-04-09 Rca Corp Two frequency electromagnetic horn radiator
FR74355E (fr) * 1951-05-23 1960-11-07 Int Standard Electric Corp Système de transmission pour haute fréquence
FR1286970A (fr) * 1960-03-09 1962-03-09 Bendix Corp Système de pavillon à double voie de fréquences
US4130823A (en) * 1977-08-05 1978-12-19 The United States Of America As Represented By The Secretary Of The Navy Miniature, flush mounted, microwave dual band cavity backed slot antenna

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU603441B2 (en) * 1987-05-11 1990-11-15 Hazeltine Corporation Multimode omniantenna with flush mount

Also Published As

Publication number Publication date
US4529989A (en) 1985-07-16
FR2507392A1 (fr) 1982-12-10
FR2507392B1 (index.php) 1985-05-03

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Inventor name: DEVIS, GEORGES

Inventor name: DUPRESSOIR, ALBERT