EP0439800A1 - Antenne à double réflecteur - Google Patents

Antenne à double réflecteur Download PDF

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Publication number
EP0439800A1
EP0439800A1 EP90125026A EP90125026A EP0439800A1 EP 0439800 A1 EP0439800 A1 EP 0439800A1 EP 90125026 A EP90125026 A EP 90125026A EP 90125026 A EP90125026 A EP 90125026A EP 0439800 A1 EP0439800 A1 EP 0439800A1
Authority
EP
European Patent Office
Prior art keywords
dielectric
molded body
antenna
subreflector
dielectric constant
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Withdrawn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
EP90125026A
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German (de)
English (en)
Inventor
Hans-Dietrich Dr. Kühne
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.)
Bosch Telecom GmbH
Original Assignee
ANT Nachrichtentechnik GmbH
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 ANT Nachrichtentechnik GmbH filed Critical ANT Nachrichtentechnik GmbH
Publication of EP0439800A1 publication Critical patent/EP0439800A1/fr
Withdrawn legal-status Critical Current

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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
    • H01Q19/18—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
    • H01Q19/193—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 with feed supported subreflector

Definitions

  • the present invention relates to an antenna which has a main reflector and a subreflector, an exciter arranged in the apex of the main reflector having at its end facing the subreflector a dielectric molded body which is provided with a reflecting end surface which performs the function of the subreflector.
  • Such an antenna is known from DE 29 38 187 A1.
  • This antenna in which the subreflector is integrated in a dielectric molded body connected to the excitation waveguide, is distinguished by a structurally simple and compact structure.
  • the supports usually used to hold the sub-reflector, which cause unwanted field reflections, are not required for this antenna.
  • the dielectric molded body whose dielectric constant is greater than 1, causes a beam deflection in such a way that the main reflector is optimally illuminated, ie the shadow zones on the main reflector are reduced. Because of the more effective occupancy of the main reflector caused by the dielectric molded body, the antenna can also be operated at lower frequencies than is actually designed with its main reflector diameter. At the interface between the dielectric molded body and the air surrounding it, forced beam reflections arise, the stronger the dielectric constant of the Shaped body from which the air deviates.
  • the invention is therefore based on the object of specifying an antenna of the type mentioned at the outset, whose feed system ensures optimum illumination of the main reflector and which is designed in such a way that disturbing beam reflections are suppressed as far as possible.
  • FIG. 1 shows a longitudinal section through a double reflector antenna with a main reflector HR and a subreflector SR.
  • An exciter E in the form of a waveguide is arranged in the apex of the main reflector HR.
  • a dielectric molded body D is inserted into this waveguide.
  • the part of the dielectric molded body D protruding from the waveguide E is preferably rotationally symmetrical and has, for. B. the shape of a truncated cone.
  • the part of the dielectric molded body D which is inserted in the waveguide E is designed at its end pointing into the waveguide as a multi-stage ⁇ / 4 transformer T in order to create a transition with the least possible reflection between the waveguide E and the dielectric molded body D.
  • the end of the dielectric molded body D can also be provided with a continuous taper, the length of which corresponds approximately to the waveguide wavelength. Reflections that occur on the end face of the waveguide E can be compensated for by a groove A1 embedded in the dielectric molded body D at a suitable distance from this end face.
  • the end face of the dielectric molded body D pointing out of the waveguide E is designed as a subreflector SR.
  • the end face of the dielectric molded body D is provided with the required subreflector contour and covered with a reflective layer (e.g. silver).
  • a recess A2 embedded in the center of the end face of the dielectric molded body D serves to compensate for waves which are reflected into the waveguide E by the subreflector SR.
  • the section of the dielectric molded body D shown in FIG. 2 illustrates the beam paths 1, 2 (solid lines) inside and outside the dielectric molded body D and the reflections (dashed lines) of these beams at the interface. It becomes clear that the beam 2 which occurs perpendicular to the interface brings about the most disturbing reflection, because in this case the reflected wave runs directly back into the waveguide E.
  • the location on the lateral surface of the dielectric molded body D at which this reflection takes place can be determined by the following equation:
  • the quantities occurring in the equation can be found in FIG. 2. It would be desirable if the beam reflections were located precisely at this location, which is at a distance 1 from the waveguide exit E on the lateral surface of the dielectric molded body D, and also in its vicinity (approximately one third of the lateral length L on each side of this location) could be kept as low as possible. This can be accomplished by providing a layer with a lower material density in the region of the dielectric molded body D, so that the effective dielectric constant of this layer is reduced compared to the dielectric constant of the remaining molded body. The reduction in the material density, as shown in FIG. 1, can be achieved by introducing grooves R. The grooves R run concentrically around the outer surface of the dielectric molded body D.
  • the depth h and the width b of the grooves R and the width s of the webs S remaining between the grooves are dimensioned as follows so that an optimally adapted, as low-reflection interface as possible is formed between the dielectric molded body D and the adjacent air: where ⁇ is the operating wavelength of the antenna and ⁇ is the dielectric constant of the molded body D.
  • the width s of the webs S should not be greater than about a third of the groove depth h. In any case, the groove width b must be significantly smaller than the operating wavelength ⁇ of the antenna.
  • An improvement in the adaptation of the interface between the dielectric molded body D and the air can be achieved under certain circumstances by introducing a dielectric into the grooves R, the dielectric constant of which is lower than that of the dielectric molded body D and has almost the value 1.

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  • Waveguide Aerials (AREA)
  • Aerials With Secondary Devices (AREA)
EP90125026A 1990-02-01 1990-12-20 Antenne à double réflecteur Withdrawn EP0439800A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19904002913 DE4002913A1 (de) 1990-02-01 1990-02-01 Doppelreflektor-antenne
DE4002913 1990-02-01

Publications (1)

Publication Number Publication Date
EP0439800A1 true EP0439800A1 (fr) 1991-08-07

Family

ID=6399184

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90125026A Withdrawn EP0439800A1 (fr) 1990-02-01 1990-12-20 Antenne à double réflecteur

Country Status (2)

Country Link
EP (1) EP0439800A1 (fr)
DE (1) DE4002913A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998053525A1 (fr) * 1997-05-22 1998-11-26 Endgate Corporation Antenne a reflecteur a pertes par reflexion reduites
WO1999010950A3 (fr) * 1997-08-21 1999-05-20 Kildal Antenna Consulting Ab Version amelioree d'une antenne a reflecteur dotee d'une alimentation autoportee
US7023394B2 (en) 2000-12-27 2006-04-04 Marconi Communications Gmbh Cassegrain-type feed for an antenna
EP2081258A1 (fr) * 2008-01-18 2009-07-22 Alcatel Lucent Réflecteur secondaire d'une antenne à double réflecteur
WO2013158222A1 (fr) 2012-04-17 2013-10-24 Andrew Llc Ensemble sous-réflecteur et élément rayonnant à cône et lentille diélectrique
EP2615691A4 (fr) * 2010-09-07 2014-11-26 Comba Telecom System China Ltd Antenne à micro-ondes à très hautes performances et ensemble source d'alimentation associé
US9698490B2 (en) 2012-04-17 2017-07-04 Commscope Technologies Llc Injection moldable cone radiator sub-reflector assembly
CN109962343A (zh) * 2019-03-11 2019-07-02 陕西维萨特科技股份有限公司 一种毫米波溅散板天线
CN117410726A (zh) * 2023-11-06 2024-01-16 安徽大学 一种应用于低剖面反射、透射阵的反射式环焦馈源

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2240893A1 (de) * 1972-08-19 1974-03-07 Gruenzweig & Hartmann Spiegelantenne, insbesondere fuer das 12 ghz-band
DE2938187A1 (de) * 1979-09-21 1981-04-02 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Cassegrain-erreger-system fuer eine parabolantenne
DE3231097A1 (de) * 1982-08-20 1984-02-23 Siemens AG, 1000 Berlin und 8000 München Antenne nach dem cassegrain-prinzip mit einer halterung fuer den subreflektor
WO1986000761A1 (fr) * 1984-07-02 1986-01-30 The Marconi Company Limited Systeme d'antenne du type cassegrain
WO1987007771A1 (fr) * 1986-06-03 1987-12-17 Stiftelsen For Industriell Og Teknisk Forskning Ve Antenne a reflecteur avec organe d'alimentation auto-porteur
DE3823056A1 (de) * 1988-07-07 1990-01-11 Siemens Ag Richtantenne

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1107299B (de) * 1953-08-03 1961-05-25 Edward Bellamy Mcmillan Fuer elektromagnetische Wellen durchlaessige dielektrische Wand
GB973583A (en) * 1962-04-11 1964-10-28 Post Office Improvements in or relating to microwave aerials
DE2920781C2 (de) * 1979-05-22 1984-07-12 Siemens AG, 1000 Berlin und 8000 München Reflektorantenne, bestehend aus einem Hauptreflektor, einem Primärstrahler und einem Subreflektor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2240893A1 (de) * 1972-08-19 1974-03-07 Gruenzweig & Hartmann Spiegelantenne, insbesondere fuer das 12 ghz-band
DE2938187A1 (de) * 1979-09-21 1981-04-02 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Cassegrain-erreger-system fuer eine parabolantenne
DE3231097A1 (de) * 1982-08-20 1984-02-23 Siemens AG, 1000 Berlin und 8000 München Antenne nach dem cassegrain-prinzip mit einer halterung fuer den subreflektor
WO1986000761A1 (fr) * 1984-07-02 1986-01-30 The Marconi Company Limited Systeme d'antenne du type cassegrain
WO1987007771A1 (fr) * 1986-06-03 1987-12-17 Stiftelsen For Industriell Og Teknisk Forskning Ve Antenne a reflecteur avec organe d'alimentation auto-porteur
DE3823056A1 (de) * 1988-07-07 1990-01-11 Siemens Ag Richtantenne

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998053525A1 (fr) * 1997-05-22 1998-11-26 Endgate Corporation Antenne a reflecteur a pertes par reflexion reduites
US5973652A (en) * 1997-05-22 1999-10-26 Endgate Corporation Reflector antenna with improved return loss
WO1999010950A3 (fr) * 1997-08-21 1999-05-20 Kildal Antenna Consulting Ab Version amelioree d'une antenne a reflecteur dotee d'une alimentation autoportee
US7023394B2 (en) 2000-12-27 2006-04-04 Marconi Communications Gmbh Cassegrain-type feed for an antenna
FR2926680A1 (fr) * 2008-01-18 2009-07-24 Alcatel Lucent Sas Reflecteur-secondaire d'une antenne a double reflecteur
WO2009090195A1 (fr) * 2008-01-18 2009-07-23 Alcatel Lucent Réflecteur secondaire d'une antenne à deux réflecteurs
EP2081258A1 (fr) * 2008-01-18 2009-07-22 Alcatel Lucent Réflecteur secondaire d'une antenne à double réflecteur
US8102324B2 (en) 2008-01-18 2012-01-24 Alcatel Lucent Sub-reflector of a dual-reflector antenna
EP2615691A4 (fr) * 2010-09-07 2014-11-26 Comba Telecom System China Ltd Antenne à micro-ondes à très hautes performances et ensemble source d'alimentation associé
WO2013158222A1 (fr) 2012-04-17 2013-10-24 Andrew Llc Ensemble sous-réflecteur et élément rayonnant à cône et lentille diélectrique
EP2839539A4 (fr) * 2012-04-17 2015-12-02 Commscope Technologies Llc Ensemble sous-réflecteur et élément rayonnant à cône et lentille diélectrique
US9698490B2 (en) 2012-04-17 2017-07-04 Commscope Technologies Llc Injection moldable cone radiator sub-reflector assembly
CN109962343A (zh) * 2019-03-11 2019-07-02 陕西维萨特科技股份有限公司 一种毫米波溅散板天线
CN117410726A (zh) * 2023-11-06 2024-01-16 安徽大学 一种应用于低剖面反射、透射阵的反射式环焦馈源

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Publication number Publication date
DE4002913A1 (de) 1991-08-08

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