EP0303001A2 - Antenne cornet - Google Patents

Antenne cornet Download PDF

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Publication number
EP0303001A2
EP0303001A2 EP88107171A EP88107171A EP0303001A2 EP 0303001 A2 EP0303001 A2 EP 0303001A2 EP 88107171 A EP88107171 A EP 88107171A EP 88107171 A EP88107171 A EP 88107171A EP 0303001 A2 EP0303001 A2 EP 0303001A2
Authority
EP
European Patent Office
Prior art keywords
horn
ring
illuminator
cap
electrically conductive
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Withdrawn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
EP88107171A
Other languages
German (de)
English (en)
Other versions
EP0303001A3 (fr
Inventor
Eugenio Martinelli
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.)
IRTE SpA
Original Assignee
IRTE SpA
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 IRTE SpA filed Critical IRTE SpA
Publication of EP0303001A2 publication Critical patent/EP0303001A2/fr
Publication of EP0303001A3 publication Critical patent/EP0303001A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/06—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using refracting or diffracting devices, e.g. lens
    • 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
    • H01Q13/06—Waveguide mouths
    • H01Q13/065—Waveguide mouths provided with a flange or a choke

Definitions

  • This invention generally relates to antennas and, more parti­cularly, to a horn illuminator for reflector antennas operating in all the spectrum of microwave frequencies, namely at frequencies ranging from 300 MHz to 60 GHz.
  • an elemental antenna for microwaves which is normally called “primary source” is a horn having a rectangular or circular section and fed by a rectangular or circular waveguide.
  • excitation fundamental mode will be the TE 10-mode and, in the latter case, it will be the TE 11-mode.
  • excitation fundamental mode it is meant the mode in which the electro­magnetic field is radiated in the free space from the primary source.
  • a primary source is used for "illuminating" one or more passive mirrors for forming a geometry based on the optics laws.
  • the antenna array is higly directional and, according to the types of used mirrors, the final antenna takes different denominations: "prime fo­cus, cassegrain, off-set etc".
  • the ideal primary source for illuminating a passive mirror should have a rectangular radiation pattern in order to deliver a constant power both in amplitude and in phase between 0° and the illumination angle included by the passive mirror. In this case there would be the dual purpose of attaining the optimal value for the illumination efficiency together with the minimum spill-over, i.e the maximum gain with the minimum noise tem­perature.
  • the object of the present invention is to provide a horn illuminator or primary source capable of emitting a substantially rec­tangular radiation patterns both on the E plane and on the H plane.
  • Another object of the present invention is to provide a horn illumi­nator or primary source having such a structure as to make the series production as inexpensive as possible.
  • the horn illuminator for reflector antennas ac­cording to the present invention is characterized in that it is provi­ded with a ring of electrically conductive material, coaxially placed before the horn mouth a distance of ⁇ /4 therefrom and in a plane parallel to that of said mouth.
  • the electrically conductive ring is supported by a cap of a plastic material exhibiting good electrical properties which simultaneously acts as a protection therefor.
  • the electrically conductive ring is embedded in the cap of plastic material so as to make the horn capable of being pres­surized.
  • the plastic material forming the cap is a polytetrafluo­roethylene.
  • a horn illuminator exhibiting a radiation pattern rectangular in shape on the H plane and E plane, obtained in accordance with the teachings of the present invention.
  • the horn illuminator is provided with a flange 5 having holes 6 for the attachment to the waveguide which feeds the horn.
  • this illuminator generally in­dicated by 1, is arisen from the requirement of having a maximum ef­ficiency near the unit value at the illumination angle desired by the parabolic mirror and for this purpose there is used a horn of circular section provided with a cylindrical mouth 3 and with one choke 2 only, placed a distance of one wavelength (A) from the 0-axis of the horn 1, and this in order not to resort to the use of various chokes which would make the horn configuration too complex and expensive.
  • A one wavelength
  • the hybrid modes are linear compositions of a TE-mode and TM-mode.
  • the excitation of a balanced hybrid mode permits radiation pattern to be obtained having a nearly circular symmetry about the radiation principal axis).
  • the radiation patterns in the H plane and E plane are quite different.
  • the radiation pattern in the H plane was sufficiently near to the design requirements, the radiation pattern in the E plane appared to be nearer to a pattern of triangular type than of rectangular type, so as to compromise any possibility of use of the horn without resorting to further ap­proaches.
  • the horn illuminator 1 is provided, before the mouth 3 having a circular cross-section, with a circular ring 4 of electrically conductive ma­terial placed a distance of ⁇ /4 from the mouth and parallel to the plane thereof.
  • the ring 4 of electrically conductive material has an outer diameter of 2 ⁇ and a thickness of about ⁇ /30.
  • the ring 4 of electrically conductive material is mechanically sup­ported in the desired position by embedding it in a cap of a plastic material exhibiting a low dielectric constant and a low dissipation factor, such as a polytetrafluoroethylene sold under Trademark "Teflon", which simultaneously acts as a protection for the horn, thereby making it capable of being pressurized.
  • Teflon cap 7 has an inwardly extending end flange 8 intended to be inserted in a groove 9 provided about the choke 2 so as to permit a firm and sure fastening thereof.
  • the horn 1 according to the present invention has been applied for illuminating a parabola being of 1 m in diameter and having a focus of 420 mm and an illumination angle of 61,5°.
  • the horn illuminator according to the present invention exhibits radiation patterns nearly rectangular in the H plane and E plane with a horn structure very simple which permits therefore the horn illuminator to be manufactured at relatively low costs.

Landscapes

  • Waveguide Aerials (AREA)
  • Details Of Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Aerials With Secondary Devices (AREA)
EP19880107171 1987-06-11 1988-05-04 Antenne cornet Withdrawn EP0303001A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2178687U IT210401Z2 (it) 1987-06-11 1987-06-11 Illuminazione a tromba per antenne a riflettore con diagramma di irradiazione rettangolare.
IT2178687U 1987-06-11

Publications (2)

Publication Number Publication Date
EP0303001A2 true EP0303001A2 (fr) 1989-02-15
EP0303001A3 EP0303001A3 (fr) 1990-09-05

Family

ID=11186825

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880107171 Withdrawn EP0303001A3 (fr) 1987-06-11 1988-05-04 Antenne cornet

Country Status (2)

Country Link
EP (1) EP0303001A3 (fr)
IT (1) IT210401Z2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2458663A (en) * 2008-03-26 2009-09-30 Thales Holdings Uk Plc Radome for a radar pressurised horn antenna

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3624655A (en) * 1968-11-05 1971-11-30 Kobusai Denkshin Denwa Kk Horn antenna
FR2097132A1 (fr) * 1970-07-02 1972-03-03 Hollandse Signaalapparaten Bv Procede pour obturer l'embouchure d'un guide d'onde
DE2607809A1 (de) * 1976-02-26 1977-09-01 Deutsche Bundespost Mikrowellenantenne geringer buendelung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3624655A (en) * 1968-11-05 1971-11-30 Kobusai Denkshin Denwa Kk Horn antenna
FR2097132A1 (fr) * 1970-07-02 1972-03-03 Hollandse Signaalapparaten Bv Procede pour obturer l'embouchure d'un guide d'onde
DE2607809A1 (de) * 1976-02-26 1977-09-01 Deutsche Bundespost Mikrowellenantenne geringer buendelung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2458663A (en) * 2008-03-26 2009-09-30 Thales Holdings Uk Plc Radome for a radar pressurised horn antenna
GB2458663B (en) * 2008-03-26 2012-11-21 Thales Holdings Uk Plc Radome

Also Published As

Publication number Publication date
EP0303001A3 (fr) 1990-09-05
IT210401Z2 (it) 1988-12-30
IT8721786V0 (it) 1987-06-11

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