EP0439800A1 - Dual-reflector antenna - Google Patents
Dual-reflector antenna Download PDFInfo
- 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- Withdrawn
Links
Images
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
- 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.
Landscapes
- Waveguide Aerials (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
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.
- 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:
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:
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:
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)
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
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.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19904002913 DE4002913A1 (en) | 1990-02-01 | 1990-02-01 | DOUBLE REFLECTOR ANTENNA |
DE4002913 | 1990-02-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0439800A1 true EP0439800A1 (en) | 1991-08-07 |
Family
ID=6399184
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90125026A Withdrawn EP0439800A1 (en) | 1990-02-01 | 1990-12-20 | Dual-reflector antenna |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0439800A1 (en) |
DE (1) | DE4002913A1 (en) |
Cited By (8)
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)
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)
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 |
-
1990
- 1990-02-01 DE DE19904002913 patent/DE4002913A1/en not_active Ceased
- 1990-12-20 EP EP90125026A patent/EP0439800A1/en not_active Withdrawn
Patent Citations (6)
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)
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 |
Also Published As
Publication number | Publication date |
---|---|
DE4002913A1 (en) | 1991-08-08 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE60103653T2 (en) | IMPROVEMENT OF THE ENTRY FOR TRANSMITTERS / RECEIVERS ELECTROMAGNETIC WAVES IN A MULTILREFLECTOR ANTENNA | |
DE69619496T2 (en) | PLANAR ANTENNA GROUP | |
DE60009874T2 (en) | V-slot antenna for circular polarization | |
DE69804023T2 (en) | ANTENNA | |
DE3612534A1 (en) | BROADBAND ANTENNA | |
DE3442387A1 (en) | HORN SPOTLIGHTS | |
DE69811046T2 (en) | PLANAR ANTENNA RADIATION STRUCTURE WITH QUASI SCAN, FREQUENCY-INDEPENDENT FEED POINT IMPEDANCE | |
DE60014218T2 (en) | Horn antenna for two frequencies with aperture latches with two depths to compensate for directional characteristics in the E and H planes | |
DE2162196B2 (en) | WAVE TYPE CONVERTER | |
DE2509923A1 (en) | ANTENNA ARRANGEMENT FOR RADIATING DIRECTIONAL BEAM CHARACTERISTICS | |
DE3601649A1 (en) | LEVEL MICROWAVE ANTENNA | |
EP0439800A1 (en) | Dual-reflector antenna | |
DE69515263T2 (en) | Coaxial waveguide transition | |
DE19600516A1 (en) | Planar antenna system for automobile collision avoidance systems | |
DE112009005005B4 (en) | Phase shifter for an N-port feed system and a deceleration device | |
DE3634772A1 (en) | ANTENNA EXTENSION FOR AT LEAST TWO DIFFERENT FREQUENCY BANDS | |
DE69833449T2 (en) | ANTENNA ARRANGEMENT FOR A SINGLE FREQUENCY | |
DE3009254C2 (en) | Antenna exciter with a radiation pattern of elliptical cross-section | |
DE1616252C3 (en) | Broadband omnidirectional antenna for microwaves, consisting of a vertical circular waveguide and at least one cone reflector | |
DE69017622T2 (en) | Level waveguide array antenna with L-shaped series / series coupling slots. | |
DE102006036325B4 (en) | Ultra broadband dipole antenna with dielectric rod and reflector | |
DE3638461A1 (en) | ANTENNA SYSTEM FOR MULTIPLE USE OF THE SPECTRUM BY ORTHOGONAL POLARISATION | |
DE4223139A1 (en) | CONNECTION BETWEEN A RECTANGULAR AND A CIRCULAR SHAFT GUIDE | |
DE69013247T2 (en) | Directly radiating distributor of maximum frequency energy. | |
DE60037563T2 (en) | Sector lobe antenna with scattering component |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT CH DE FR GB IT LI NL |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19920208 |