EP0439800A1 - Dual-reflector antenna - Google Patents

Dual-reflector antenna 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
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Prior art keywords
dielectric
molded body
antenna
subreflector
dielectric constant
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EP90125026A
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German (de)
French (fr)
Inventor
Hans-Dietrich Dr. Kühne
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Bosch Telecom GmbH
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ANT Nachrichtentechnik GmbH
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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.

Abstract

In an antenna having a main and an auxiliary reflector, whose supply system ensures optimum illumination of the main reflector, interfering reflections are suppressed as far as possible. A dielectric moulded body (D), which is provided with a reflecting end surface which carries out the function of the subreflector (SR), is inserted into the exciter (E) of the antenna. The dielectric moulded body (D) has a layer with a smaller material thickness, so that the effective dielectric constant of this layer is reduced with respect to the dielectric constant of the rest of the moulded body (S). <IMAGE>

Description

Die vorliegende Erfindung betrifft eine Antenne, die einen Hauptreflektor und einen Subreflektor besitzt, wobei ein im Scheitel des Hauptreflektors angeordneter Erreger an seinem dem Subreflektor zugewandten Ende einen dielektrischen Formkörper aufweist, der mit einer die Funktion des Subreflektors ausübenden, reflektierenden Endfläche versehen ist.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.

Eine derartige Antenne ist aus der DE 29 38 187 A1 bekannt. Diese Antenne, bei der der Subreflektor in einem mit dem Erregerhohlleiter verbundenen dielektrischen Formkörper integriert ist, zeichnet sich durch einen konstruktiv einfachen und kompakten Aufbau aus. Die üblicherweise für die Halterung des Subreflektors verwendeten Stützen, welche unerwünschte Feldreflexionen hervorrufen, entfallen bei dieser Antenne. Der dielektrische Formkörper, dessen Dielektrizitätskonstante größer als 1 ist, bewirkt eine Strahlumlenkung in der Weise, daß der Hauptreflektor optimal ausgeleuchtet wird, d.h. die Schattenzonen auf dem Hauptreflektor verringert werden. Wegen der durch den dielektrischen Formkörper bewirkten effektiveren Belegung des Hauptreflektors kann die Antenne auch noch bei niedrigeren Frequenzen betrieben werden, als sie mit ihrem Hauptreflektordurchmesser eigentlich ausgelegt ist. An der Grenzfläche zwischen dem dielektrischen Formkörper und der ihn umgebenden Luft entstehen zwangsweise Strahlreflexionen, die umso stärker sind, je mehr die Dielektrizitätskonstante des Formkörpers von der der Luft abweicht.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.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Antenne der eingangs genannten Art anzugeben, deren Speisesystem für eine optimale Ausleuchtung des Hauptreflektors sorgt und das so ausgelegt ist, daß störende Strahlreflexionen möglichst weitgehend unterdrückt werden.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.

Erfindungsgemäß wird diese Aufgabe durch die Merkmale des Patentanspruchs 1 gelöst. Vorteilhafte Weiterbildungen der Erfindung gehen aus den Unteransprüchen hervor.According to the invention, this object is achieved by the features of patent claim 1. Advantageous developments of the invention emerge from the subclaims.

Anhand eines in der Zeichnung dargestellten Ausführungsbeispiels wird nachfolgend die Erfindung näher erläutert.

  • Fig. 1 zeigt einen Längsschnitt durch eine Doppelreflektorantenne und
  • Fig. 2 zeigt einen Ausschnitt des dielektrischen Formkörpers mit darin verlaufenden Strahlengängen.
Based on an embodiment shown in the drawing, the invention is explained in more detail below.
  • Fig. 1 shows a longitudinal section through a double reflector antenna and
  • Fig. 2 shows a section of the dielectric molded body with beam paths extending therein.

Der Figur 1 ist ein Längsschnitt durch eine Doppelreflektor-Antenne mit einem Hauptreflektor HR und einem Subreflektor SR zu entnehmen. Im Scheitel des Hauptreflektors HR ist ein Erreger E in Gestalt eines Hohlleiters angeordnet. In diesen Hohlleiter ist ein dielektrischer Formkörper D eingesetzt. Der aus dem Hohlleiter E herausragende Teil des dielektrischen Formkörpers D ist vorzugsweise rotationssymmetrisch und hat z. B. die Form eines Kegelstumpfes. Der im Hohlleiter E steckende Teil des dielektrischen Formkörpers D ist an seinem in den Hohlleiter hineinweisenden Ende als mehrstufiger λ/4-Transformator T ausgebildet, um einen möglichst reflexionsarmen Übergang zwischen dem Hohlleiter E und dem dielektrischen Formkörper D zu schaffen. Anstelle des λ/4-Transformators T kann das Ende des dielektrischen Formkörpers D auch mit einer stetigen verjüngung versehen werden, deren Länge etwa der Hohlleiterwellenlänge entspricht. Reflexionen, die an der Stirnseite des Hohlleiters E entstehen, können durch eine in geeignetem Abstand von dieser Stirnseite in den dielektrischen Formkörper D eingelassenen Nut A1 kompensiert werden.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 λ / 4 transformer T in order to create a transition with the least possible reflection between the waveguide E and the dielectric molded body D. Instead of λ / 4 transformer T, 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.

Die aus dem Hohlleiter E herausweisende Endfläche des dielektrischen Formkörpers D ist als Subreflektor SR ausgebildet. Dazu ist die Endfläche des dielektrischen Formkörpers D mit der erforderlichen Subreflektorkontur versehen und mit einer reflektierenden Schicht überzogen (z. B. Silber). Eine im Zentrum der Endfläche des dielektrischen Formkörpers D eingelassene Aussparung A2 dient zur Kompensation von Wellen, die vom Subreflektor SR in den Hohlleiter E hineinreflektiert werden.The end face of the dielectric molded body D pointing out of the waveguide E is designed as a subreflector SR. For this purpose, 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.

Wie bereits einleitend erwähnt, entstehen an der Grenzfläche zwischen Luft und dem dielektrischen Körper D störende Reflexionen. Der in Fig. 2 dargestellte Ausschnitt des dielektrischen Formkörpers D verdeutlicht die Strahlengänge 1, 2 (durchgezogene Linien) innerhalb und außerhalb des dielektrischen Formkörpers D und die Reflexionen (strichelierte Linien) dieser Strahlen an der Grenzfläche. Dabei wird deutlich, daß derjenige Strahl 2, welcher senkrecht auf die Grenzfläche auftritt, die am meisten störende Reflexion mit sich bringt, weil in diesem Fall die reflektierte Welle direkt in den Hohlleiter E zurückläuft. Der Ort auf der Mantelfläche des dielektrischen Formkörpers D, an dem diese Reflexion stattfindet, läßt sich durch die folgende Gleichung bestimmen:

Figure imgb0001
As already mentioned in the introduction, disturbing reflections arise at the interface between air and the dielectric body D. 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:
Figure imgb0001

Die in der Gleichung vorkommenden Größen können der Figur 2 entnommen werden. Es wäre wünschenswert, wenn gerade an diesem Ort, der sich im Abstand 1 vom Hohlleiterausgang E auf der Mantelfläche des dielektrischen Formkörpers D befindet, und auch noch in seiner näheren Umgebung (ca. ein Drittel der Mantellänge L zu jeder Seite dieses Ortes) die Strahlreflexionen möglichst gering gehalten werden könnten. Dies läßt sich dadurch bewerkstelligen, daß in dem genannten Bereich des dielektrischen Formkörpers D eine Schicht mit geringerer Materialdichte vorgesehen wird, so daß die effektive Dielektrizitätskonstante dieser Schicht gegenüber der Dielektrizitätskonstanten des übrigen Formkörpers vermindert ist. Die Verringerung der Materialdichte kann, wie Figur 1 zeigt, durch Einbringen von Rillen R erreicht werden. Die Rillen R verlaufen konzentrisch um die Mantelfläche des dielektrischen Formkörpers D herum. Damit eine optimal angepaßte, möglichst reflexionsarme Grenzfläche zwischen dem dielektrischen Formkörper D und der angrenzenden Luft entsteht, sind die Tiefe h und die Breite b der Rillen R und die Breite s der zwischen den Rillen verbleibenden Stege S folgendermaßen zu dimensionieren:

Figure imgb0002

wobei λ die Betriebswellenlänge der Antenne und ε die Dielektrizitätskonstante des Formkörpers D ist. Die Breite s der Stege S sollte nicht größer als etwa ein Drittel der Rillentiefe h sein. In jedem Fall muß die Rillenbreite b wesentlich kleiner sein als die Betriebswellenlänge λ der Antenne.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:
Figure imgb0002
where λ is the operating wavelength of the antenna and ε 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 λ of the antenna.

Eine Verbesserung der Anpassung der Grenzfläche zwischen dem dielektrischen Formkörper D und der Luft kann unter Umständen dadurch erreicht werden, daß in die Rillen R ein Dielektrikum eingebracht wird, dessen Dielektrizitätskonstante geringer ist als die des dielektrischen Formkörpers D und nahezu den Wert 1 hat.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.

Claims (4)

Antenne, die einen Hauptreflektor und einen Subreflektor besitzt, wobei ein im Scheitel des Hauptreflektors angeordneter Erreger an seinem dem Subreflektor zugewandten Ende einen dielektrischen Formkörper aufweist, der mit einer die Funktion des Subreflektors ausübenden reflektierenden Endfläche versehen ist, dadurch gekennzeichnet, daß zumindest in solchen Mantelflächenbereichen des dielektrischen Formkörpers (D), die störende Strahlreflexionen hervorrufen, der dielektrische Formkörper (D) eine Schicht mit geringer Materialdichte aufweist, so daß die effektive Dielektrizitätskonstante dieser Schicht gegenüber der Dielektrizitätskonstanten des übrigen Formkörpers (D) vermindert ist.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 functions as the subreflector, characterized in that at least in such lateral surface areas of the dielectric molded body (D), which cause interfering beam reflections, the dielectric molded body (D) has a layer with a low material density, so that the effective dielectric constant of this layer is reduced compared to the dielectric constant of the other molded body (D). Antenne nach Anspruch 1, dadurch gekennzeichent, daß die Mantelfläche des Formkörpers (D) zumindest in den Bereichen, bei denen störende Strahlreflexionen auftreten, mit Rillen (R) versehen sind.Antenna according to Claim 1, characterized in that the outer surface of the shaped body (D) is provided with grooves (R) at least in the areas in which disturbing beam reflections occur. Antenne nach Anspruch 2, dadurch gekennzeichnet, daß die Breite (s) eines zwischen jeweils zwei benachbarten Rillen (R) bestehenden Steges (S) und die Rillenbreite (b) so dimensioniert sind, daß
Figure imgb0003
 gilt,
wobei ε die Dielektrizitätskonstante des Formkörpers (D) ist, daß die Stegbreite (S) nicht größer als etwa ein Drittel der Rillentiefe (h) ist und daß die Rillentiefe (h) so bemessen ist, daß h = 0,25 . ε-0,25 . λ, gilt,
wobei λ die Betriebswellenlänge der Antenne ist.Antenna according to claim 2, characterized in that the width (s) of a web (S) existing between two adjacent grooves (R) and the groove width (b) are dimensioned such that
Figure imgb0003
 applies
where ε is the dielectric constant of the molded body (D), that the web width (S) is not greater than about a third of the groove depth (h) and that the groove depth (h) is dimensioned such that h = 0.25. ε-0.25. λ,
where λ is the operating wavelength of the antenna. Antenne nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß in die Rillen (R) ein Dielektrikum eingebracht ist, dessen Dielektrizitätskonstante geringer ist als die des dielektrischen Formkörpers (D) und nahezu den Wert 1 hat.Antenna according to one of the preceding claims, characterized in that a dielectric is introduced 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.
EP90125026A 1990-02-01 1990-12-20 Dual-reflector antenna Withdrawn EP0439800A1 (en)

Applications Claiming Priority (2)

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DE19904002913 DE4002913A1 (en) 1990-02-01 1990-02-01 DOUBLE REFLECTOR ANTENNA
DE4002913 1990-02-01

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998053525A1 (en) * 1997-05-22 1998-11-26 Endgate Corporation Reflector antenna with improved return loss
WO1999010950A2 (en) * 1997-08-21 1999-03-04 Kildal Antenna Consulting Ab Improved reflector antenna with a self-supported feed
US7023394B2 (en) 2000-12-27 2006-04-04 Marconi Communications Gmbh Cassegrain-type feed for an antenna
EP2081258A1 (en) * 2008-01-18 2009-07-22 Alcatel Lucent Secondary reflector of an antenna with double reflector
EP2615691A1 (en) * 2010-09-07 2013-07-17 Comba Telecom System (China) Ltd. Microwave antenna with ultra-high performance and feed source assembly thereof
WO2013158222A1 (en) 2012-04-17 2013-10-24 Andrew Llc Dielectric lens cone radiator sub-reflector assembly
US9698490B2 (en) 2012-04-17 2017-07-04 Commscope Technologies Llc Injection moldable cone radiator sub-reflector assembly
CN117410726A (en) * 2023-11-06 2024-01-16 安徽大学 Reflective ring Jiao Kuiyuan applied to low-profile reflective and transmissive arrays

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2240893A1 (en) * 1972-08-19 1974-03-07 Gruenzweig & Hartmann MIRROR ANTENNA, IN PARTICULAR FOR THE 12 GHZ BAND
DE2938187A1 (en) * 1979-09-21 1981-04-02 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt CASSEGRAIN EXCITATION SYSTEM FOR A PARABOL AERIAL
DE3231097A1 (en) * 1982-08-20 1984-02-23 Siemens AG, 1000 Berlin und 8000 München Antenna in accordance with the Cassegrain principle, having a holder for the subreflector
WO1986000761A1 (en) * 1984-07-02 1986-01-30 The Marconi Company Limited Cassegrain aerial system
WO1987007771A1 (en) * 1986-06-03 1987-12-17 Stiftelsen For Industriell Og Teknisk Forskning Ve Reflector antenna with a self-supported feed
DE3823056A1 (en) * 1988-07-07 1990-01-11 Siemens Ag Directional antenna

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1107299B (en) * 1953-08-03 1961-05-25 Edward Bellamy Mcmillan Dielectric wall permeable to electromagnetic waves
GB973583A (en) * 1962-04-11 1964-10-28 Post Office Improvements in or relating to microwave aerials
DE2920781C2 (en) * 1979-05-22 1984-07-12 Siemens AG, 1000 Berlin und 8000 München Reflector antenna, consisting of a main reflector, a primary radiator and a subreflector

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2240893A1 (en) * 1972-08-19 1974-03-07 Gruenzweig & Hartmann MIRROR ANTENNA, IN PARTICULAR FOR THE 12 GHZ BAND
DE2938187A1 (en) * 1979-09-21 1981-04-02 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt CASSEGRAIN EXCITATION SYSTEM FOR A PARABOL AERIAL
DE3231097A1 (en) * 1982-08-20 1984-02-23 Siemens AG, 1000 Berlin und 8000 München Antenna in accordance with the Cassegrain principle, having a holder for the subreflector
WO1986000761A1 (en) * 1984-07-02 1986-01-30 The Marconi Company Limited Cassegrain aerial system
WO1987007771A1 (en) * 1986-06-03 1987-12-17 Stiftelsen For Industriell Og Teknisk Forskning Ve Reflector antenna with a self-supported feed
DE3823056A1 (en) * 1988-07-07 1990-01-11 Siemens Ag Directional antenna

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998053525A1 (en) * 1997-05-22 1998-11-26 Endgate Corporation Reflector antenna with improved return loss
US5973652A (en) * 1997-05-22 1999-10-26 Endgate Corporation Reflector antenna with improved return loss
WO1999010950A2 (en) * 1997-08-21 1999-03-04 Kildal Antenna Consulting Ab Improved reflector antenna with a self-supported feed
WO1999010950A3 (en) * 1997-08-21 1999-05-20 Kildal Antenna Consulting Ab Improved reflector antenna with a self-supported feed
US7023394B2 (en) 2000-12-27 2006-04-04 Marconi Communications Gmbh Cassegrain-type feed for an antenna
WO2009090195A1 (en) * 2008-01-18 2009-07-23 Alcatel Lucent Sub-reflector of a dual-reflector antenna
EP2081258A1 (en) * 2008-01-18 2009-07-22 Alcatel Lucent Secondary reflector of an antenna with double reflector
FR2926680A1 (en) * 2008-01-18 2009-07-24 Alcatel Lucent Sas SECONDARY REFLECTOR OF A DOUBLE REFLECTOR ANTENNA
US8102324B2 (en) 2008-01-18 2012-01-24 Alcatel Lucent Sub-reflector of a dual-reflector antenna
EP2615691A1 (en) * 2010-09-07 2013-07-17 Comba Telecom System (China) Ltd. Microwave antenna with ultra-high performance and feed source assembly thereof
EP2615691A4 (en) * 2010-09-07 2014-11-26 Comba Telecom System China Ltd Microwave antenna with ultra-high performance and feed source assembly thereof
WO2013158222A1 (en) 2012-04-17 2013-10-24 Andrew Llc Dielectric lens cone radiator sub-reflector assembly
EP2839539A4 (en) * 2012-04-17 2015-12-02 Commscope Technologies Llc Dielectric lens cone radiator sub-reflector assembly
US9698490B2 (en) 2012-04-17 2017-07-04 Commscope Technologies Llc Injection moldable cone radiator sub-reflector assembly
CN117410726A (en) * 2023-11-06 2024-01-16 安徽大学 Reflective ring Jiao Kuiyuan applied to low-profile reflective and transmissive arrays

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