EP1325537B1 - Perfectionnement aux sources d'emission / reception d'ondes electromagnetiques pour antenne a multireflecteurs - Google Patents

Perfectionnement aux sources d'emission / reception d'ondes electromagnetiques pour antenne a multireflecteurs Download PDF

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Publication number
EP1325537B1
EP1325537B1 EP01976390A EP01976390A EP1325537B1 EP 1325537 B1 EP1325537 B1 EP 1325537B1 EP 01976390 A EP01976390 A EP 01976390A EP 01976390 A EP01976390 A EP 01976390A EP 1325537 B1 EP1325537 B1 EP 1325537B1
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EP
European Patent Office
Prior art keywords
longitudinal
waveguide
source according
source
radiation
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
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EP01976390A
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German (de)
English (en)
French (fr)
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EP1325537A1 (fr
Inventor
Ali Louzir
Philippe Minard
Franck Thudor
Jean-François PINTOS
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Thomson Licensing SAS
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Thomson Licensing SAS
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
    • 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
    • H01Q11/02—Non-resonant antennas, e.g. travelling-wave antenna
    • H01Q11/08—Helical antennas
    • 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
    • H01Q13/20—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/24—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave constituted by a dielectric or ferromagnetic rod or pipe
    • 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
    • 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
    • H01Q5/47—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 with a coaxial arrangement of the feeds

Definitions

  • the present invention relates to a source antenna (E) / reception (R), hereinafter called E / R source which can be placed at the point focal point of an antenna system and more particularly at the focal point of a Cassegrain type double reflector antenna.
  • E source antenna
  • R reception
  • I / O source I / O source
  • the propeller network for reception and the longitudinal radiation source for emission.
  • the losses of the printed supply network affect doubly the link budget.
  • the G / T merit factor of the antenna is reduced on the one hand due to the reduction in the gain G of the antenna, and on the other hand, the increase in the noise temperature T of the system linked to the losses dissipative from the power network.
  • the solution proposed in patent application 00 07424 allows, using a network of propellers rather than a network of patches, to improve the factor G / T of the antenna.
  • the object of the present invention is to remedy this problem by proposing an E / R source structure having its phase center between the main reflector and the secondary reflector without inducing blockage for the functioning of the antenna system with two reflectors. It thus makes possible reduction of the side lobes of the antenna system.
  • the present invention also aims to propose a new E / R source structure which reduces the side lobes of sources of emission and reception.
  • a dual reflector antenna system has a perfectly defined focal point and requires for E / R sources a perfect coincidence of their phase centers.
  • the present invention also aims to provide a E / R source structure which allows to perfectly match the phase centers of emission and reception sources.
  • the subject of the present invention is therefore a source of emission / reception (E / R) of electromagnetic waves for antenna with multi-reflector of the Cassegrain type comprising means with longitudinal radiation operating in a first frequency band and a network of n Traveling wave type radiating elements operating in a second frequency band with the n radiating elements arranged symmetrically around the longitudinal radiation means, the network and the longitudinal radiation means having a phase center substantially common, characterized in that the network of n elements radiating is excited by a waveguide forming a slice-shaped cavity pineapple "of rectangular cross section.
  • the network of n elements radiating is a circular network and the guide forms a cavity in the form of "Pineapple slice".
  • the waveguide is sized to such that, D being the mean diameter of the circular network:
  • n the number of radiating elements and ⁇ g the guided wavelength at the operating frequency.
  • ⁇ g ⁇ 0 [ ⁇ r - ( ⁇ 0 / ⁇ c) 2 ] - 1 ⁇ 2 with ⁇ c the cut-off wavelength of the rectangular guide for the fundamental mode TE01, ⁇ 0 the wavelength in vacuum and ⁇ r the permittivity of the filling dielectric material guide.
  • ⁇ c 2a ( ⁇ r) 1 ⁇ 2 where a is the width of the rectangular guide.
  • D is chosen such that: 1.3 ⁇ 0 ⁇ D ⁇ 1.9 ⁇ 0.
  • the rectangular guide above is excited by a connected probe reception circuits (LNA (Low Noise Amplifier in English), mixer, etc ...) by a coaxial line.
  • LNA Low Noise Amplifier in English
  • a second conical cavity surrounds it.
  • Figure 3 schematically shows a sectional view of the E / R source 10 object of the invention, placed at the focal point FP of a system antenna with double reflector located between the two reflectors 1 and 3.
  • the rear cavities 13 and 14 making it possible to reduce the radiation of the lateral lobes for the "Polyrod" and for the propeller network are conical.
  • the rectangular waveguide 15 in the form of a "slice pineapple ” is excited by a coaxial line 16.
  • the radiating helices 11 are in turn coupled by probe 17 to the cavity in a rectangular guide.
  • FIG. 5 shows the detail and the dimensioning of a propeller 11 excited at 12 GHz mounted on a waveguide 15 of straight section polygonal, more particularly rectangular with dimensions a and b.
  • Figure 6a presents simulations showing the result of the coupling of the rectangular guide to the propellers according to the invention as well as the adaptation of the guide cavity to the central frequency of 12 GHz., in the case of 4 propellers such as 11-2, 11-3, 11-4, 11-5 compared to port A1 ( Figure 6b).
  • equations (I) and (III) allow to deduce a relation between ⁇ g and ⁇ 0 . Taking this relation into account in (II), we deduce a.
  • the height b of the rectangular guide is chosen to be approximately half its width. So let b ⁇ a / 2.
  • the quantities ⁇ , ⁇ and h are adjusted so as to reduce the level of the secondary lobes of the propeller network.
  • the diameter d c is given by the dimensioning of the rectangular guide 15, and more particularly by its width a.
  • the depth d is such that the phase center FP of the "polyrod »12 (which is about 1/3 the length of the polyrod) coincides with the phase center FH of the propeller network 11 (ie in the middle of the propeller network and about 1/3 of the length of l 'propeller).
  • the point Fp is at a height of approximately Lp / 3 where Lp is the total length of the polyrod 12 counted from the origin.
  • the shape of the rear cavity of the central polyrod can be changed.
  • the rear cavity can have a cylindrical or similar shape.
  • FIG. 7 represents a particular embodiment of the source transmission / reception object of the invention.
  • the emission part is made up of polyrod 12 and operates in the 14-14.5 GHz band.
  • the conical cavity allowed for this configuration to get the best result.
  • the adaptation of the polyrod in the target band (14-14.5 GHz) as well as the radiation patterns obtained in the presence of the conical cavity are given in FIG. 8.
  • the source is constituted by a propeller 12 mounted in a conical cavity 13 and coupled by a probe 17 to Tx supply.
  • the polarizations of the sources at transmission and reception are circular and can be from same or opposite direction.
  • the 12 'propeller can be positioned in a cylindrical cavity like the polyrod.
EP01976390A 2000-10-12 2001-10-11 Perfectionnement aux sources d'emission / reception d'ondes electromagnetiques pour antenne a multireflecteurs Expired - Lifetime EP1325537B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0013213 2000-10-12
FR0013213 2000-10-12
PCT/FR2001/003132 WO2002031920A1 (fr) 2000-10-12 2001-10-11 Perfectionnement aux sources d'emission / reception d'ondes electromagnetiques pour antenne a multireflecteurs

Publications (2)

Publication Number Publication Date
EP1325537A1 EP1325537A1 (fr) 2003-07-09
EP1325537B1 true EP1325537B1 (fr) 2004-06-02

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EP01976390A Expired - Lifetime EP1325537B1 (fr) 2000-10-12 2001-10-11 Perfectionnement aux sources d'emission / reception d'ondes electromagnetiques pour antenne a multireflecteurs

Country Status (10)

Country Link
US (1) US6861998B2 (ko)
EP (1) EP1325537B1 (ko)
JP (1) JP4090875B2 (ko)
KR (1) KR20030040513A (ko)
CN (1) CN1254883C (ko)
AU (1) AU2001295677A1 (ko)
DE (1) DE60103653T2 (ko)
ES (1) ES2222394T3 (ko)
MX (1) MXPA03002670A (ko)
WO (1) WO2002031920A1 (ko)

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WO2002031920A1 (fr) 2002-04-18
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JP2004511940A (ja) 2004-04-15
ES2222394T3 (es) 2005-02-01
KR20030040513A (ko) 2003-05-22
US20040021612A1 (en) 2004-02-05
US6861998B2 (en) 2005-03-01
MXPA03002670A (es) 2003-06-24
CN1470089A (zh) 2004-01-21
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CN1254883C (zh) 2006-05-03
AU2001295677A1 (en) 2002-04-22

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