EP0817311A2 - Erregersystem mit dielektrischem Strahler für eine Parabolreflektorantenne - Google Patents
Erregersystem mit dielektrischem Strahler für eine Parabolreflektorantenne Download PDFInfo
- Publication number
- EP0817311A2 EP0817311A2 EP97401353A EP97401353A EP0817311A2 EP 0817311 A2 EP0817311 A2 EP 0817311A2 EP 97401353 A EP97401353 A EP 97401353A EP 97401353 A EP97401353 A EP 97401353A EP 0817311 A2 EP0817311 A2 EP 0817311A2
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- European Patent Office
- Prior art keywords
- reflector
- radiator
- excitation system
- waveguide
- partial surfaces
- 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.)
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- 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
- H01Q19/12—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 wherein the surfaces are concave
- H01Q19/13—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 wherein the surfaces are concave the primary radiating source being a single radiating element, e.g. a dipole, a slot, a waveguide termination
- H01Q19/134—Rear-feeds; Splash plate feeds
Definitions
- the invention relates to an excitation system for an antenna with a parabolic curved reflector and a dielectric radiator, which at the end of one of the guide electromagnetic waveguide, centrally located in the reflector waveguide is attached and has a metallized end surface designed as a sub-reflector (DE 29 38 187 A1).
- Such antennas are also referred to as "Cassegrain” antennas because of the sub-reflector. They are used, for example, for radio, television, telephone and data transmission.
- Antennas according to DE 29 38 187 A1 mentioned at the outset are structurally relatively simple in construction, since the radiator serving as an "exciter” with a sub-reflector is carried by the waveguide attached centrally to the reflector. For the correct dimensioning of the radiator, which is circular, as is the reflector, only ⁇ r the relative dielectric constant ⁇ r of the dielectric material used has to be taken into account.
- the excitation system known from DE 29 38 187 A1 can be used for parabolic antennas with a circular reflector shaped as a paraboloid of revolution.
- the invention has for its object the excitation system described above to further develop that it can also be used for sector antennas whose reflector is not circular is.
- the sector antenna shown in FIGS. 1 and 2 has a reflector 1, which as rectangular stripe is executed. It is parabolic in the direction of its major axis A. bent.
- An excitation system is arranged centrally in the reflector 1 and consists of a waveguide 2 and a dielectric radiator 3.
- the radiator 3 has a as at its free end Subreflector serving metallized end surface 4 (Fig. 3). Feeded over the waveguide 2 Electromagnetic waves are thereby in the direction of the arrows drawn in Fig. 1 deflected to the reflector 1 and emitted by the same in the set sector. For received waves apply the opposite way.
- Such sector antennas will for example in mobile radio to illuminate a given area (sector) used.
- the reflector 1 can be closed off by two laterally attached walls 5 and 6 extend parallel to the axis of the waveguide 2 and up to the two ends of the reflector 1 is enough. They serve to attenuate the side lobes of the sector antenna. For further The inside of walls 5 and 6 can be used to improve the damping of the side lobes Absorber material 7 may be coated.
- the excitation system consists of the waveguide 2 and of the same carried dielectric radiator 3.
- the dielectric body of the radiator 3 has an in the waveguide 2 protruding, not shown with the fastening part.
- the thickened in Fig. 3 drawn end surface 4 of the radiator 3 is shaped so that the above Radiation properties can be achieved.
- the radiator 3 has four partial surfaces, which are shaped in pairs and Arranged on opposite sides with respect to the central axis of the waveguide 2 are.
- a radiator 3 with a rectangular end surface is shown in FIG. 4.
- the end face 4 is divided into four partial areas 8 and 9 on the one hand and 10 and 1 1 on the other hand, in pairs are the same size and are opposite each other with respect to the axis of the waveguide 2.
- the Subareas 8 and 9 extend substantially at right angles to the major axis A of Reflector 1 or the sector antenna.
- the partial areas 10 and 11 of the radiator 3 are i. w. arranged at right angles to the partial surfaces 8 and 9. They limit the dielectric body of the radiator 3 so on two sides that are approximately perpendicular to the sides of the dielectric Body lie in which the subareas 8 and 9 are located.
- the partial surfaces 8 and 9 extend in the embodiment of the radiator 3 according to FIG. 3 and 4 - as already mentioned - mainly at right angles to the major axis A of the sector antenna. Their areas are also large in relation to the areas of the other two partial areas 10 and 11. Radiation and reception of electromagnetic waves occur mainly in the direction of the major axis A of the reflector antenna.
- the end surface 4 of the radiator 3 can also be oval according to FIG. 5.
- the shape of the subareas 8 and 9 or 10 and 11 is changed accordingly. This applies to all geometrical designs the end surface 4. In all cases, the partial surfaces 8 and 9 are always large in relation to the Partial areas 10 and 11.
- a symmetrical to the axis of the Waveguide 2 lying recess 12 are attached.
- metallizing is also in the recess 12 produces a metal layer.
- symmetrical to the axis of the Recess 12 lying in waveguide 2 can be seen, for example, from FIG. 6.
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Abstract
Description
- daß der Reflektor zur Bildung einer Sektorantenne als rechteckiger Streifen ausgebildet ist, der in Richtung seiner großen Achse parabelförmig gebogen ist,
- daß die Endfläche des Strahlers vier Teilflächen aufweist, die paarweise gleich geformt und aufeinander bezüglich der Mittelachse des Hohlleiters gegenüberliegenden Seiten so angeordnet sind, daß die Flächen der beiden Paare etwa rechtwinklig zueinander verlaufen und
- daß die beiden in Richtung der großen Achse des Reflektors weisenden Teilflächen des Strahlers groß sind im Verhältnis zu den beiden quer dazu angeordneten Teilflächen.
5. Auflage, Springer-Verlag, 1992, Seiten N51 und N52 beschrieben sind, können dadurch vermieden werden. Die vollständige Ausleuchtung des Reflektors mit maximalem Gewinn ist dabei durch eine von der geometrischen Gestaltung und Anordnung des Reflektors abweichende geometrische Gestaltung des Strahlers erreicht. Die als Subreflektor dienende Endfläche ist durch die unterschiedlich großen, aber paarweise gleichen Teilflächen in Umlaufrichtung unsymmetrisch gestaltet. Damit ist die durch die DE 29 38 187 Al bekannte geometrische Kongruenz von Reflektor und Strahler bei diesem Erregersystem gezielt nicht gegeben.
Claims (6)
- Erregersystem für eine Antenne mit einem parabelförmig gebogenen Reflektor und einem dielektrischen Strahler, der am Ende eines der Führung elektromagnetischer Wellen dienenden, zentral im Reflektor angeordneten Hohlleiters angebracht ist und eine metallisierte, als Subreflektor ausgebildete Endfläche hat, dadurch gekennzeichnet,daß der Reflektor (1) zur Bildung einer Sektorantenne als rechteckiger Streifen ausgebildet ist, der in Richtung seiner großen Achse (A) parabelförmig gebogen ist,daß die Endfläche (4) des Strahlers (3) vier Teilflächen (8,9,10,11) aufweist, die paarweise gleich geformt und auf einander bezüglich der Mittelachse des Hohlleiters (2) gegenüberliegenden Seiten so angeordnet sind, daß die Flächen der beiden Paare etwa rechtwinklig zueinander verlaufen unddaß die beiden in Richtung der großen Achse (A) des Reflektors (1) weisenden Teilflächen (8,9) des Strahlers (3) groß sind im Verhältnis zu den beiden quer dazu angeordneten Teilflächen (10,11).
- Erregersystem nach Anspruch 1, dadurch gekennzeichnet,daß die Endfläche (4) des Strahlers (3) im wesentlichen rechteckig ist unddaß die beiden in Richtung der großen Achse (A) des Reflektors (1) weisenden Teilflächen (8,9) sich im wesentlichen rechtwinklig zur großen Achse (A) des Reflektors (1) erstrecken.
- Erregersystem nach Anspruch 1, dadurch gekennzeichnet, daß die Endfläche (4) des Strahlers (3) im wesentlichen oval ist.
- Erregersystem nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß in der Endfläche (4) des Strahlers (3) eine zentrale, symmetrisch zur Achse des Hohlleiters (2) liegende Vertiefung (12) angebracht ist.
- Erregersystem nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß an den beiden langen, parabelförmig verlaufenden Längskanten des Reflektors (1) je eine Wand (5,6) angebracht ist, die parallel zur Achse des Hohlleiters (2) verläuft und den Reflektor (1) bis zu seinen beiden Enden seitlich abschließt.
- Erregersystem nach Anspruch 5, dadurch gekennzeichnet, daß an den Innenseiten der Wände (5,6) Absorbermaterial (7) angebracht ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19626655 | 1996-07-03 | ||
DE19626655 | 1996-07-03 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0817311A2 true EP0817311A2 (de) | 1998-01-07 |
EP0817311A3 EP0817311A3 (de) | 1999-06-30 |
Family
ID=7798738
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97401353A Withdrawn EP0817311A3 (de) | 1996-07-03 | 1997-06-16 | Erregersystem mit dielektrischem Strahler für eine Parabolreflektorantenne |
Country Status (7)
Country | Link |
---|---|
US (1) | US5922081A (de) |
EP (1) | EP0817311A3 (de) |
AU (1) | AU717508B2 (de) |
BR (1) | BR9703860A (de) |
CA (1) | CA2209410A1 (de) |
DE (1) | DE19725047A1 (de) |
NO (1) | NO973089L (de) |
Families Citing this family (128)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19961237A1 (de) | 1999-12-18 | 2001-06-21 | Alcatel Sa | Antenne zur Abstrahlung und zum Empfang elektromagnetischer Wellen |
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GB973583A (en) * | 1962-04-11 | 1964-10-28 | Post Office | Improvements in or relating to microwave aerials |
DE2938187A1 (de) * | 1979-09-21 | 1981-04-02 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Cassegrain-erreger-system fuer eine parabolantenne |
GB2161324A (en) * | 1984-07-02 | 1986-01-08 | Marconi Co Ltd | Cassegrain aerial system |
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US3530480A (en) * | 1967-07-03 | 1970-09-22 | Bell Telephone Labor Inc | Cassegrain antenna having dielectric supporting structure for subreflector |
DE2240893A1 (de) * | 1972-08-19 | 1974-03-07 | Gruenzweig & Hartmann | Spiegelantenne, insbesondere fuer das 12 ghz-band |
US4283401A (en) * | 1978-07-12 | 1981-08-11 | Richter Gedeon Vegyeszeti Gyar Rt | Process for the preparation of 11-bromo-vincaminic acid ester derivatives and their use in protecting animals against cerebral hypoxy |
US4673947A (en) * | 1984-07-02 | 1987-06-16 | The Marconi Company Limited | Cassegrain aerial system |
-
1997
- 1997-06-13 DE DE19725047A patent/DE19725047A1/de not_active Withdrawn
- 1997-06-16 EP EP97401353A patent/EP0817311A3/de not_active Withdrawn
- 1997-06-30 CA CA002209410A patent/CA2209410A1/en not_active Abandoned
- 1997-06-30 AU AU28423/97A patent/AU717508B2/en not_active Ceased
- 1997-07-02 NO NO973089A patent/NO973089L/no unknown
- 1997-07-02 US US08/886,803 patent/US5922081A/en not_active Expired - Fee Related
- 1997-07-03 BR BR9703860A patent/BR9703860A/pt active Search and Examination
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US2478241A (en) * | 1945-07-09 | 1949-08-09 | Chu Lan Jen | Flat beam antenna |
US2556087A (en) * | 1948-02-27 | 1951-06-05 | Rca Corp | Directive antenna system |
GB973583A (en) * | 1962-04-11 | 1964-10-28 | Post Office | Improvements in or relating to microwave aerials |
DE2938187A1 (de) * | 1979-09-21 | 1981-04-02 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Cassegrain-erreger-system fuer eine parabolantenne |
GB2161324A (en) * | 1984-07-02 | 1986-01-08 | Marconi Co Ltd | Cassegrain aerial system |
Also Published As
Publication number | Publication date |
---|---|
US5922081A (en) | 1999-07-13 |
BR9703860A (pt) | 1998-08-04 |
AU717508B2 (en) | 2000-03-30 |
AU2842397A (en) | 1998-01-15 |
DE19725047A1 (de) | 1998-01-08 |
NO973089D0 (no) | 1997-07-02 |
CA2209410A1 (en) | 1998-01-03 |
EP0817311A3 (de) | 1999-06-30 |
NO973089L (no) | 1998-01-05 |
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