EP0550320A1 - Wellenleiter mit geraden strahlenden Schlitzen, angeregt durch metallische Einsätze - Google Patents

Wellenleiter mit geraden strahlenden Schlitzen, angeregt durch metallische Einsätze Download PDF

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Publication number
EP0550320A1
EP0550320A1 EP92403491A EP92403491A EP0550320A1 EP 0550320 A1 EP0550320 A1 EP 0550320A1 EP 92403491 A EP92403491 A EP 92403491A EP 92403491 A EP92403491 A EP 92403491A EP 0550320 A1 EP0550320 A1 EP 0550320A1
Authority
EP
European Patent Office
Prior art keywords
guide
slot
flaps
slots
slotted
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.)
Granted
Application number
EP92403491A
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English (en)
French (fr)
Other versions
EP0550320B1 (de
Inventor
Daniel Thomson-Csf Caer
Jean Thomson-Csf Le Foll
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 EP0550320A1 publication Critical patent/EP0550320A1/de
Application granted granted Critical
Publication of EP0550320B1 publication Critical patent/EP0550320B1/de
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
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/0006—Particular feeding systems
    • H01Q21/0037—Particular feeding systems linear waveguide fed arrays
    • H01Q21/0043—Slotted waveguides

Definitions

  • the present invention relates to a guide with non-inclined radiating slots of the type comprising slots perpendicular to the axis of the guide, cut on a small side of the guide with a spacing substantially but not exactly equal to a half wavelength of operation in the guide, and means for exciting each of these slots.
  • Slotted guides are frequently used as linear arrays of radiating sources in array antennas, for example in radar. Their advantages are low cost and low losses. To obtain a radiation close to normal to the guide and a good adaptation, it is necessary on the one hand a distance between successive slits close to ⁇ g / 2, where ⁇ g is the wavelength in the guide, and on the other hand an additional phase shift of ⁇ between two consecutive slots.
  • slots arranged on the long side of a rectangular section guide or on the short side have several drawbacks and in particular a large pitch between successive guides, which limits the scanning angle of the beam in a plane perpendicular to the guides. We therefore prefer to use slots on the short side of the guides.
  • a first solution therefore consists in tilting the slots alternately on one side and on the other to obtain the necessary conditions specified above.
  • this solution has the drawback, due to the inclination of the slits, of radiating a cross-polarized component which can reach levels incompatible with proper functioning of the antenna using these guides.
  • Another known solution then consists in using non-inclined slots (perpendicular to the axis of the guide) and in exciting them by means of an obstacle placed in the guide (iris, rods).
  • the invention relates to a slotted guide overcomes these drawbacks through the use of metal shutters to excite each slot.
  • a guide with non-inclined radiating slots of the type comprising slots perpendicular to the axis of the guide, cut on a short side of the guide with a spacing substantially but not exactly equal to half a length d operating wave in the guide, and means of excitation of each of these slots, characterized in that said excitation means consist of at least one metal flap inserted in the guide along a long side of the guide and of said short side carrying the slots, in a position adjacent to the associated slot and extending in a plane parallel to that of the slot.
  • Figures 1 and 2 show a waveguide 1 comprising, cut on the short side, radiating slots 2, 3 not inclined, that is to say perpendicular to the longitudinal axis of the guide. As already mentioned, such slots are normally not coupled to the energy propagating in the guide 1 and therefore do not radiate.
  • flaps 21, 22, 31, 32 are here of triangular shape. They are arranged and welded into mounting slots cut in the guide and of adequate depth, perpendicular to the walls of the guide.
  • the flaps are associated with the slots 2, 3 in pairs, respectively 21-22, 31-32 and arranged adjacent to the associated slots and on either side thereof.
  • Each flap is located in the guide against the short side carrying the slots and one of the long sides of the guide.
  • the radiating slits are spaced apart by a pitch substantially equal to ⁇ g / 2, where ⁇ g is the wavelength of operation in the guide.
  • ⁇ g is the wavelength of operation in the guide.
  • the metal shutters are all cut to form similar right triangles whatever their size and therefore have the same angle ⁇ .
  • the advantage of such a characteristic is that, during manufacture, all of the shutter mounting slots can be obtained by orienting the guide by rotation about its axis by a given fixed angle relative to the machine tool. .
  • the angle ⁇ is chosen to obtain an optimum adaptation in the guide and can, for example, be of the order of 30 °.
  • the metal shutters constitute obstacles in the guide and necessarily produce reflections of part of the energy which propagates there. It is clear that, when the spacing between homologous flaps is equal to ⁇ g / 2, the reflected energies are added and there is a sharp degradation of the TOS. When it is desired to operate in a given frequency band, it is therefore necessary to provide the guide with a spacing of the radiating slits such that, either this spacing is less than ⁇ g / 2 for all the frequencies of the band, or else it is greater than ⁇ g / 2 for all band frequencies. In practice, the first solution is preferred, because when the spacing is greater than ⁇ g / 2, there is a risk of seeing annoying lobes of the network appear.
  • the coupling of a radiating slot is adjustable by the size of the flaps and by their spacing at the slot.
  • One of the great advantages of metal shutters is that they can be placed right at the edge of the radiating slots (unlike the rods) and that it is in this position that the widest bandwidth is obtained.
  • the metal shutters are less selective than, for example, rods or irises. We therefore obtain a wider bandwidth and a better TOS. But a major advantage is that, in addition, it has been found that, with metal shutters as excitation devices, the radiating slots used could be much narrower, up to 50% narrower. However, this is essential for the performance of a rectilinearly polarized antenna using such slot guides because this results in a significant reduction in cross polarization.

Landscapes

  • Waveguide Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
EP92403491A 1991-12-31 1992-12-21 Wellenleiter mit geraden strahlenden Schlitzen, angeregt durch metallische Einsätze Expired - Lifetime EP0550320B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9116384A FR2685820B1 (fr) 1991-12-31 1991-12-31 Guide a fentes rayonnantes non inclinees excitees par des volets metalliques.
FR9116384 1991-12-31

Publications (2)

Publication Number Publication Date
EP0550320A1 true EP0550320A1 (de) 1993-07-07
EP0550320B1 EP0550320B1 (de) 1996-11-13

Family

ID=9420705

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92403491A Expired - Lifetime EP0550320B1 (de) 1991-12-31 1992-12-21 Wellenleiter mit geraden strahlenden Schlitzen, angeregt durch metallische Einsätze

Country Status (5)

Country Link
US (1) US5422652A (de)
EP (1) EP0550320B1 (de)
CA (1) CA2085453A1 (de)
DE (1) DE69215202T2 (de)
FR (1) FR2685820B1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3336733B2 (ja) * 1994-04-07 2002-10-21 株式会社村田製作所 移動手段用通信モジュール
CN103326125B (zh) * 2013-06-29 2015-02-25 中国人民解放军国防科学技术大学 一维可扫波导窄边缝隙天线
JP6615570B2 (ja) * 2015-10-27 2019-12-04 Ｎｔｎ株式会社 導波管スロットアンテナ
JP6752394B2 (ja) * 2018-05-02 2020-09-09 三菱電機株式会社 導波管スロットアレーアンテナ
WO2023117427A1 (en) 2021-12-23 2023-06-29 Huber+Suhner Ag Antenna device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2574433A (en) * 1943-10-01 1951-11-06 Roger E Clapp System for directional interchange of energy between wave guides and free space
US2818565A (en) * 1956-09-05 1957-12-31 James S Ajioka Slab excited continuous slot antenna
EP0048817A1 (de) * 1980-09-29 1982-04-07 Hughes Aircraft Company Staberregte Hohlleiterschlitzantenne
FR2654555A1 (fr) * 1989-11-14 1991-05-17 Thomson Csf Guide a fentes rayonnantes non inclinees a excitation par motif rayonnant.
EP0428299A2 (de) * 1989-11-15 1991-05-22 Hughes Aircraft Company Schlitzantenne mit steuerbarer Polarisation

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3004259A (en) * 1958-07-21 1961-10-10 Hughes Aircraft Co Electrically variable waveguide slot with longitudinal polarization

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2574433A (en) * 1943-10-01 1951-11-06 Roger E Clapp System for directional interchange of energy between wave guides and free space
US2818565A (en) * 1956-09-05 1957-12-31 James S Ajioka Slab excited continuous slot antenna
EP0048817A1 (de) * 1980-09-29 1982-04-07 Hughes Aircraft Company Staberregte Hohlleiterschlitzantenne
FR2654555A1 (fr) * 1989-11-14 1991-05-17 Thomson Csf Guide a fentes rayonnantes non inclinees a excitation par motif rayonnant.
EP0428299A2 (de) * 1989-11-15 1991-05-22 Hughes Aircraft Company Schlitzantenne mit steuerbarer Polarisation

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
INTERNATIONAL JOURNAL OF ELECTRONICS vol. 68, no. 6, Juin 1990, LONDON GB pages 1075 - 1088 SANGSTER 'New slotted-waveguide antenna element for low side-lobe arrays' *

Also Published As

Publication number Publication date
FR2685820B1 (fr) 1994-03-18
DE69215202D1 (de) 1996-12-19
DE69215202T2 (de) 1997-03-27
FR2685820A1 (fr) 1993-07-02
US5422652A (en) 1995-06-06
CA2085453A1 (fr) 1993-06-22
EP0550320B1 (de) 1996-11-13

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