EP0284897A1 - Antenne directive micro-ondes à deux réflecteurs - Google Patents

Antenne directive micro-ondes à deux réflecteurs Download PDF

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Publication number
EP0284897A1
EP0284897A1 EP88104199A EP88104199A EP0284897A1 EP 0284897 A1 EP0284897 A1 EP 0284897A1 EP 88104199 A EP88104199 A EP 88104199A EP 88104199 A EP88104199 A EP 88104199A EP 0284897 A1 EP0284897 A1 EP 0284897A1
Authority
EP
European Patent Office
Prior art keywords
reflector
edge
directional antenna
sub
subreflector
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
EP88104199A
Other languages
German (de)
English (en)
Other versions
EP0284897B1 (fr
Inventor
Erwin Dipl.-Ing. Härtinger
Wolfgang Dipl.-Ing. Rebhan
Gerhard Dipl.-Ing. Schindler
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to AT88104199T priority Critical patent/ATE77514T1/de
Publication of EP0284897A1 publication Critical patent/EP0284897A1/fr
Application granted granted Critical
Publication of EP0284897B1 publication Critical patent/EP0284897B1/fr
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
    • 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
    • H01Q19/10—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 reflecting surfaces
    • H01Q19/18—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 reflecting surfaces having two or more spaced reflecting surfaces
    • H01Q19/19—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 reflecting surfaces having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface
    • 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
    • H01Q19/02—Details
    • H01Q19/021—Means for reducing undesirable effects

Definitions

  • the invention relates to a rotationally symmetrical two-reflector microwave directional antenna with low sub-lobe levels of the radiation diagram in predetermined spatial areas using a main reflector, a sub-reflector illuminating the main reflector, which adversely affects the sub-lobe attenuation, which is concavely curved according to the Gregory principle, and one with its opening between the main reflector apex and the subreflector apex arranged primary horn, the aperture assignment is designed toroidally such that it falls off from both the main reflector and the subreflector edge, starting from an intermediate maximum.
  • Directional antennas have a wide range of applications in the field of radio technology, in particular directional radio technology and satellite radio. In most applications, such directional antennas require good attenuation of the side lobes. With directional antennas for satellite ground stations, for example, interference from terrestrial directional radio networks can be reduced. Terrestrial directional radio links can be meshed more closely when using antennas with low lobes. However, the increasingly dense occupation of the satellite synchronous orbit by communications satellites and the ever increasing networking of terrestrial microwave links lead to the fact that the microwave antennas used on the ground interfere with neighboring radio links more or are more disturbed by them themselves. Such antennas should therefore have improved sub-zip attenuation in the future.
  • the antenna pattern and thus the spatial distribution of the radiated energy of a directional antenna with an undisturbed circular aperture is theoretically dependent solely on the specified occupancy function of the field strength of the radiation field in the aperture.
  • the side lobe level compared to the constant occupied antenna aperture if the field strength gradually drops towards the aperture edge.
  • the object of the invention is to design a two-reflector microwave directional antenna of the type mentioned at the outset in such a way that the requirements of the secondary zip field attenuation, which are very high nowadays, can also be met, in particular in the angular ranges further away from the main beam direction.
  • a gradual field drop in the direction of the main reflector edge is thus combined with a gradual field drop in the direction of the sub-reflector edge, the level of the radiation maximum lying approximately in the middle between the sub and the main reflector edge initially slowly and then more rapidly to level values of about - 15 dB drops.
  • the level, especially at the main reflector edge can also be lower.
  • the radiation maximum should not be much further out, because otherwise the central occupancy part would lead to an impermissibly high first side lobe.
  • the measures specified by the invention are particularly advantageous if they are applied to antennas whose main reflector has an aperture diameter of approximately 200 wavelengths or less. These are usually smaller antennas.
  • the sub-reflector is expediently held by a plurality of supports which are attached to the outside of the sub-reflector and whose base points lie in the region of the main reflector edge. Illumination by the subreflector is then largely avoided.
  • the supports can be straight or curved. Measurements have shown that the side lobe rise is less with curved supports because the interference radiation is distributed over a larger angular range. Four supports in an X-shaped arrangement are advantageously provided.
  • the edge at the opening of the primary horn can also be covered by absorber material, ie an absorber ring.
  • the subreflector can be covered all around in an edge zone by absorber material.
  • the edge zone covered by the absorber material extends over about a third of the subreflector radius, starting from the edge.
  • the edge zone of the subreflector is advantageously milled out, the absorber material with the appropriate contour being inserted into the milled out.
  • the absorber material for covering the edge of the primary horn as well as the subreflector edge zone suitably consists of a weatherproof material.
  • FIG. 1 shows a schematic side view of a rotationally symmetrical two-directional microwave directional antenna with a main reflector 1, a subreflector 2 that illuminates the main reflector 1 and is concavely curved according to the Gregory principle, and one with its opening between the apex of the main reflector 1 and the apex of the sub-reflector 2 arranged primary horn radiator 3.
  • the primary horn radiator 3 is fed via a hollow line 4, which is led out through an apex opening of the main reflector 1 to the rear.
  • the sub-reflector 2 is held by four X-shaped straight supports 5, the base points of which lie in the region of the edge of the main reflector 1.
  • the sub-reflector 2 and the supports 5 are necessarily in the beam path of the main reflector 1 and thereby cause interference, which is reflected in a deterioration in the side lobe characteristics. If the primary horn 3 is still relatively close to the subreflector 2, additional disturbances are to be expected, which do not allow the secondary lobe specifications to be met, at least in the wide-angle range.
  • Fig. 2 is a beam from the primary horn 3 to the edge 7 of the subreflector 2, with 10 a beam from the subreflector 2 to the edge 6 of the primary horn 3, 11 denotes a beam from the sub-reflector 2 to the main reflector 1 and 12 denotes a beam from the sub-reflector 2 to the edge 8 of the main reflector 1.
  • the beam 9 describes the radiation and diffraction effects at the subreflector 2.
  • the beam 12 describes the radiation and the edge diffraction at the main reflector 1.
  • the beam 11 describes the reflection from the main reflector 1 onto the subreflector edge 7.
  • the dominant source of interference is the secondary scattered radiation from the subreflector 2 illuminated primary horn 3, which is caused by the beam 10.
  • the main reflector 1 and the subreflector 2 are designed according to the invention in such a way that the subreflector stray field indicated by the beam 10 towards the edge 6 of the primary horn emitter has a certain low radiation level of, for example, ⁇ 8 dBi, and the subreflector scatter field indicated by the beam 11 in the direction of the projection of the sub-reflector edge 7 in the main reflector 1 does not exceed a certain low radiation level of, for example, -6 dBi, and the sub-reflector stray field indicated by the beam 12 in the direction of the main reflector edge 8 does not exceed a certain low radiation level of, for example, -10 dBi.
  • Fig. 3 shows a longitudinal sectional view of a grooved primary horn 3, which is covered at the front at its edge 6 at the opening with a ring made of absorber material 13.
  • the absorber material 13 is graphitized polyurethane foam with a weatherproof impregnated textile fabric skin or a weatherproof, absorbent rubber mat.
  • Fig. 4 shows a subreflector 2, which is covered all around in an edge zone by absorber material 15.
  • the edge zone covered by the absorber material 15 extends over about a third of the sub-reflector radius R, starting from the edge.
  • the edge zone of the sub-reflector 2 is milled out.
  • the absorber material 15 with a suitable contour profile 16 is inserted into the cutout 14.
  • a smooth surface profile is obtained which has more favorable properties with regard to snow and ice build-up as well as contamination than an absorber which was subsequently glued on, e.g. a rubber mat.

Landscapes

  • Aerials With Secondary Devices (AREA)
EP88104199A 1987-03-19 1988-03-16 Antenne directive micro-ondes à deux réflecteurs Expired - Lifetime EP0284897B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88104199T ATE77514T1 (de) 1987-03-19 1988-03-16 Zweireflektor-microwellen-richtantenne.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3709040 1987-03-19
DE3709040 1987-03-19

Publications (2)

Publication Number Publication Date
EP0284897A1 true EP0284897A1 (fr) 1988-10-05
EP0284897B1 EP0284897B1 (fr) 1992-06-17

Family

ID=6323520

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88104199A Expired - Lifetime EP0284897B1 (fr) 1987-03-19 1988-03-16 Antenne directive micro-ondes à deux réflecteurs

Country Status (3)

Country Link
EP (1) EP0284897B1 (fr)
AT (1) ATE77514T1 (fr)
DE (1) DE3872016D1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4140841A1 (de) * 1990-12-20 1992-07-02 Siemens Ag Mikrowellen-richtfunkantenne
DE4200755A1 (de) * 1992-01-14 1993-07-15 Siemens Ag Zweireflektor-mikrowellen-richtantenne
US6429826B2 (en) 1999-12-28 2002-08-06 Telefonaktiebolaget Lm Ericsson (Publ) Arrangement relating to reflector antennas
WO2002065584A1 (fr) * 2001-02-13 2002-08-22 Raytheon Company Procede d'optimisation destine a une antenne a deux reflecteurs
CN108808250A (zh) * 2018-06-08 2018-11-13 西安电子科技大学 基于超表面的凸面共形格里高利天线

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3611393A (en) * 1970-04-27 1971-10-05 Bell Telephone Labor Inc Parabolic tripod feed support for parabolic dish antenna
FR2304192A1 (fr) * 1975-03-14 1976-10-08 Thomson Csf Antenne a reduction selective de gain
EP0136817A1 (fr) * 1983-09-06 1985-04-10 Andrew Corporation Antenne de type Gregory aux lobes secondaires faibles

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3611393A (en) * 1970-04-27 1971-10-05 Bell Telephone Labor Inc Parabolic tripod feed support for parabolic dish antenna
FR2304192A1 (fr) * 1975-03-14 1976-10-08 Thomson Csf Antenne a reduction selective de gain
EP0136817A1 (fr) * 1983-09-06 1985-04-10 Andrew Corporation Antenne de type Gregory aux lobes secondaires faibles

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ELECTRONICS & COMMUNICATIONS IN JAPAN, Band 54-B, Nr. 11, 1971, Seiten 34-39, New York, US; H. YOKOI et al.: "Low-sidelobe paraboloidal antenna with microwave absorber" *
INTERNATIONAL CONFERENCE ON COMMUNICATIONS, ICC'79, Conference Record, Boston, Ma., 10.-14. Juni 1979, Band 1, Seiten 6.6.1-6.6.5, IEEE, New York, US; A.B. HARRIS et al.: "Reducing the sidelobes of earth-station antennas" *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4140841A1 (de) * 1990-12-20 1992-07-02 Siemens Ag Mikrowellen-richtfunkantenne
DE4200755A1 (de) * 1992-01-14 1993-07-15 Siemens Ag Zweireflektor-mikrowellen-richtantenne
US6429826B2 (en) 1999-12-28 2002-08-06 Telefonaktiebolaget Lm Ericsson (Publ) Arrangement relating to reflector antennas
WO2002065584A1 (fr) * 2001-02-13 2002-08-22 Raytheon Company Procede d'optimisation destine a une antenne a deux reflecteurs
US6603437B2 (en) 2001-02-13 2003-08-05 Raytheon Company High efficiency low sidelobe dual reflector antenna
CN108808250A (zh) * 2018-06-08 2018-11-13 西安电子科技大学 基于超表面的凸面共形格里高利天线

Also Published As

Publication number Publication date
EP0284897B1 (fr) 1992-06-17
ATE77514T1 (de) 1992-07-15
DE3872016D1 (de) 1992-07-23

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