EP0948084A2 - Dual polarised antenna element - Google Patents
Dual polarised antenna element Download PDFInfo
- Publication number
- EP0948084A2 EP0948084A2 EP99102424A EP99102424A EP0948084A2 EP 0948084 A2 EP0948084 A2 EP 0948084A2 EP 99102424 A EP99102424 A EP 99102424A EP 99102424 A EP99102424 A EP 99102424A EP 0948084 A2 EP0948084 A2 EP 0948084A2
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- EP
- European Patent Office
- Prior art keywords
- line
- slot
- symmetry
- slots
- coupled
- 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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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/0428—Substantially flat resonant element parallel to ground plane, e.g. patch antenna radiating a circular polarised wave
- H01Q9/0435—Substantially flat resonant element parallel to ground plane, e.g. patch antenna radiating a circular polarised wave using two feed points
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means
- H01Q9/0457—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means electromagnetically coupled to the feed line
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/0478—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with means for suppressing spurious modes, e.g. cross polarisation
Definitions
- the present invention relates to a dual polarized Antenna element consisting of one in a first level lying planar emitter element, one in a second Layered metallized surface that is at least two slots running below the radiator element has, and one arranged in a third level, with coupled to the slots in the level above Feeder structure, with one of the slots on a line of symmetry of the radiator element and at least one further slot orthogonal and mirror-symmetrical to the Line of symmetry runs and the slots with separate Feed lines are coupled.
- Planar antennas consisting of a multitude of such dual Polarized antenna elements, for example, in the Base stations and in the subscriber stations from point to multipoint Radio transmission systems are used.
- Such planar antennas have the advantage of a high one Design flexibility desired Antenna characteristics, and they allow one inexpensive production in large numbers.
- the point-to-multipoint radio transmission system is the radio field divided into several sectors around a base station, with a separate planar antenna for each radio field sector is available. To ensure the highest possible transmission capacity to achieve the transmission channels in neighboring Sectors or the transmit and receive channels within of a sector with different polarizations. You want to due to space constraints on separate transmit and receive antennas can do without an antenna with which both sent and is also received with dual polarized Antenna elements can be realized.
- a dual polarized antenna element that introduces is described in Electronics Letters, February 16, 1995, Vol. 31, No. 4, pp. 245, 246.
- This known antenna element are next to one on one Line of symmetry of the radiator element lying slot two further slits orthogonal to it arranged opposite edges of the radiator element.
- the slot running on the line of symmetry is one planar feed line for waves of a first polarization coupled, and a second feed line for waves one second polarization is via a line junction with coupled to the other two slots.
- That conceived dual polarized antenna element still has a relative high cross polarization between 32 and 35 dB.
- the invention is therefore based on the object of a dual polarized antenna element of the type mentioned specify, whose cross polarization is as low as possible.
- FIG. 1 is a cross section through a planar, dual polarized antenna element shown.
- This Antenna element has one on a first level Substrate 1 arranged radiator element (patch) 2.
- a metallized surface 4 in which, as explained in more detail with reference to FIGS. 2 and 3 is, several coupling slots 5, 6 are available.
- a third level namely on the underside of the substrate 3 is one shown in detail in Figures 2 and 3
- Feed line structure 7, 8 arranged with the Slits 5 and 6 is coupled.
- a ground surface 9 is also arranged.
- radome plastic cover
- the gaps between the mutually spaced levels 10, 1, 3 and 9 are with a Dielectric filled, which is a lower one Dielectric constant has as the substrates 1 and 3; e.g. this dielectric is air.
- a planar array antenna is made up of a large number of such individual antenna elements.
- FIG. 2 is a top view of a single dual To see polarized antenna element, the dashed bordered area represents the radiator element 2 and below it the coupling slots 5 in different levels and 6 and the feed lines 7 and 8 run.
- the antenna element should be dual polarizable. That's why the two coupling slots 5 and 6 are orthogonal to each other, so that two orthogonal wave modes to the Radiator element 2 can be coupled.
- the first Coupling slot 5 lies on a line of symmetry 11 of the Radiator element 2.
- the line of symmetry 11 shares this here e.g. rectangular shaped radiator element 2 in two the same large areas.
- a feed line 7 crosses the coupling slot 5 in its middle. Thus, one at the 7.1 input Feed line 7 fed wave of a first polarization coupled to the slot 5. One over slot 5 branch line 7.2 going beyond serves to adapt the Line 7 to slot 5.
- the coupling slot 6 for the second polarization runs perpendicular to the coupling slot 5, the coupling slot 6 off-center of the radiator element 2 in its edge area runs.
- the coupling slot 6 extends mirror-symmetrical to the line of symmetry 11.
- the coupling a wave mode with a second polarization to the Coupling slot 6 takes place as a Line branch 8 trained feed line.
- Input 8.1 of the feed line, at which the shaft with the second polarization branches into two mirror-symmetrical to the line of symmetry 11 Line arms, each of which the coupling slot 6 in one Crossed points 12, 13 and one each for adjustment serving branch line 8.2, 8.3 ends.
- the totally mirror-symmetrical to the line of symmetry 11 The feed line is also mirror-symmetrical on two to the line of symmetry 11 points 12 and 13 with the Coupling slot 6 coupled. Because of the very symmetrical Slot and line configuration of the dual polarized Antenna element is a very high decoupling of the Achieved orthogonally polarized wave modes. The decoupling is supported by the fact that the Inputs 7.1 and 8.1 of the two feed lines 7 and 8 led out opposite sides of the beam element 2 are.
- a modified embodiment of the slot 6 shows the Figure 3.
- the slot 6 in two sub-slots 6.1 and 6.2 divided, the perpendicular and mirror-symmetrical to Axis of symmetry 11, on both sides of the coupling slot 5, run.
- By dividing the slot 6 into two Sub-slots 6.1 and 6.2 can now use the two sub-slots away from the edge of the radiator element 2 in the direction of its Center to be moved.
- This arrangement of the coupling slots 5 and 6.1, 6.2 allows a reduction in Area of the antenna element.
- the two arms of the Line branching of the feed line 8 are with each a partial slot 6.1, 6.2 in a point 14 or 15 coupled.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Waveguide Aerials (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft ein dual polarisiertes Antennenelement, bestehend aus einem in einer ersten Ebene liegenden planaren Strahlerelement, einer in einer zweiten Ebene angeordneten metallisierten Fläche, die mindestens zwei unterhalb des Strahlerelements verlaufende Schlitze aufweist, und einer in einer dritten Ebene angeordneten, mit den Schlitzen in der darüberliegenden Ebene gekoppelten Speiseleitungsstruktur, wobei von den Schlitzen einer auf einer Symmetrielinie des Strahlerelements und mindestens ein weiterer Schlitz orthogonal und spiegelsymmetrisch zu der Symmetrielinie verläuft und die Schlitze mit getrennten Speiseleitungen gekoppelt sind.The present invention relates to a dual polarized Antenna element consisting of one in a first level lying planar emitter element, one in a second Layered metallized surface that is at least two slots running below the radiator element has, and one arranged in a third level, with coupled to the slots in the level above Feeder structure, with one of the slots on a line of symmetry of the radiator element and at least one further slot orthogonal and mirror-symmetrical to the Line of symmetry runs and the slots with separate Feed lines are coupled.
Planare Antennen, bestehend aus einer Vielzahl solcher dual polarisierter Antennenelemente, können beispielsweise in den Basistationen und in den Teilnehmerstationen von Punkt-zu-Mehrpunkt Funkübertragungssystemen eingesetzt werden. Derartige planare Antennen haben den Vorteil einer hohen Flexibilität beim Entwurf erwünschter Antennencharakteristiken, und sie erlauben eine kostengünstige Fertigung in großer Stückzahl. Bei einem Punkt-zu-Mehrpunkt Funkübertragungssystem ist das Funkfeld um eine Basistation herum in mehrere Sektoren aufgeteilt, wobei für jeden Funkfeldsektor eine eigene planare Antenne vorhanden ist. Um eine möglichst hohe Übertragungskapazität zu erzielen, werden die Übertragungskänale in benachbarten Sektoren oder auch die Sende- und Empfangskanäle innerhalb eines Sektors verschieden polarisiert übertragen. Will man aus Platzgründen den auf getrennte Sende- und Empfangsantennen verzichten, kann eine Antenne, mit der sowohl gesendet als auch empfangen wird, mit dual polarisierten Antennenelementen realisiert werden.Planar antennas consisting of a multitude of such dual Polarized antenna elements, for example, in the Base stations and in the subscriber stations from point to multipoint Radio transmission systems are used. Such planar antennas have the advantage of a high one Design flexibility desired Antenna characteristics, and they allow one inexpensive production in large numbers. At a The point-to-multipoint radio transmission system is the radio field divided into several sectors around a base station, with a separate planar antenna for each radio field sector is available. To ensure the highest possible transmission capacity to achieve the transmission channels in neighboring Sectors or the transmit and receive channels within of a sector with different polarizations. You want to due to space constraints on separate transmit and receive antennas can do without an antenna with which both sent and is also received with dual polarized Antenna elements can be realized.
Ein dual polarisiertes Antennenelement der einleitend beschriebenen Art ist in Electronics Letters, 16.02.1995, Vol. 31, No. 4, S. 245, 246 beschrieben. Bei diesem bekannten Antennenelement sind neben einem auf einer Symmetrielinie des Strahlerelements liegenden Schlitz zwei weitere orthogonal dazu verlaufende Schlitze an gegenüberliegenden Rändern des Strahlerelements angeordnet. Der auf der Symmetrielinie verlaufende Schlitz ist mit einer planaren Speiseleitung für Wellen einer ersten Polarisation gekoppelt, und eine zweite Speiseleitung für Wellen einer zweiten Polarisation ist über eine Leitungsverzweigung mit den anderen beiden Schlitzen gekoppelt. Das so konzipierte dual polarisierte Antennenelement weist noch eine relativ hohe Kreuzpolarisation zwischen 32 und 35 dB auf.A dual polarized antenna element that introduces is described in Electronics Letters, February 16, 1995, Vol. 31, No. 4, pp. 245, 246. With this known antenna element are next to one on one Line of symmetry of the radiator element lying slot two further slits orthogonal to it arranged opposite edges of the radiator element. The slot running on the line of symmetry is one planar feed line for waves of a first polarization coupled, and a second feed line for waves one second polarization is via a line junction with coupled to the other two slots. That conceived dual polarized antenna element still has a relative high cross polarization between 32 and 35 dB.
Der Erfindung liegt daher die Aufgabe zugrunde, ein dual polarisiertes Antennenelement der eingangs genannten Art anzugeben, dessen Kreuzpolarisation möglichst gering ist. The invention is therefore based on the object of a dual polarized antenna element of the type mentioned specify, whose cross polarization is as low as possible.
Die genannte Aufgabe wird mit den Merkmalen des Anspruchs 1
dadurch gelöst, daß ein orthogonal zur Symmetrielinie des
Strahlerelements verlaufender Schlitz an zwei
spiegelsymmetrisch zur Symmetrielinie liegenden Punkten mit
einer Speiseleitung gekoppelt ist, die als
spiegelsymmetrisch verlaufende Leitungsverzweigung
ausgebildet ist. Diese streng symmetrische Anordnung der
Schlitze und der sie ankoppelnden Speiseleitungen bringt
eine hohe Entkopplung der orthogonal zueinander
polarisierten Wellenmoden mit sich. Es wird eine
Polarisationsentkopplung von ca. 38 dB mit einer relativen
Bandbreite von 5,7% erreicht.This object is achieved with the features of
Vorteilhafte Weiterbildungen der Erfindungen gehen aus den Unteransprüchen hervor. Danach kann sich der orthogonal zur Symmetrielinie verlaufende Schlitz entweder im Randbereich des Strahlerelements erstrecken oder er wird in zwei Teilschlitze aufgeteilt, die zu beiden Seiten des in der Symmetrielinie liegenden Schlitzes verlaufen, wobei jeder Teilschlitz mit einem Arm der spiegelsymmetrischen Leitungsverzweigung gekoppelt ist. Durch die Aufteilung eines Schlitzes in zwei Teilschlitze wird es möglich, die orthogonal zueinander verlaufenden Schlitze näher zusammenzuführen, so daß in vorteilhafter Weise die Größe des Antennenelements reduziert werden kann. Advantageous further developments of the inventions result from the Sub-claims emerge. Then the orthogonal to Slit running in the symmetry line either in the edge area of the radiator element or it will be in two Partial slots split on either side of the in the Line of symmetry lying slot, each Partial slot with an arm of mirror symmetry Line branch is coupled. By dividing up a slot in two sub-slots it becomes possible to orthogonal slits closer to each other merge, so that advantageously the size of the antenna element can be reduced.
Anhand zweier in der Zeichnung dargestellter
Ausführungsbeispiele wird nachfolgend die Erfindung näher
erläutert. Es zeigen:
In der Fig 1 ist ein Querschnitt durch ein planares, dual
polarisiertes Antennenelement dargestellt. Dieses
Antennenelement weist ein in einer ersten Ebene, auf einem
Substrat 1 angeordnetes Strahlerelement (Patch) 2 auf. In
einer darunterliegenden Ebene befindet sich auf der
Oberfläche eines Substrats 3 eine metallisierte Fläche 4, in
der, wie anhand von Fig. 2 und Fig. 3 noch näher erläutert
wird, mehrere Koppelschlitze 5, 6 vorhanden sind. In einer
dritten Ebene, nämlich auf der Unterseite des Substrats 3
ist eine in den Figuren 2 und 3 detailliert dargestellte
Speiseleitungsstruktur 7, 8 angeordnet, die mit den
Schlitzen 5 und 6 gekoppelt ist. In einer untersten Ebene
ist noch eine Massefläche 9 angeordnet. Zum Schutz des
Antennenelements kann noch eine Kunststoffabdeckung (Radom)
10 vorgesehen werden. Die Zwischenräume zwischen den
einander beabstandeten Ebenen 10, 1, 3 und 9 sind mit einem
Dielektrikum gefüllt, das eine niedrigere
Dielektrizitätskonstante aufweist als die Substrate 1 und 3;
z.B. ist dieses Dielektrikum Luft. 1 is a cross section through a planar, dual
polarized antenna element shown. This
Antenna element has one on a
Eine planare Gruppenantenne wird aus einer Vielzahl solcher einzelnen Antennenelemente aufgebaut.A planar array antenna is made up of a large number of such individual antenna elements.
In der Figur 2 ist eine Draufsicht auf ein einzelnes dual
polarisiertes Antennenelement zu sehen, wobei die
strichliert umrandete Fläche das Strahlerelement 2 darstellt
und darunter in verschiedenen Ebenen die Koppel-Schlitze 5
und 6 und die Speiseleitungen 7 und 8 verlaufen. Wie gesagt,
soll das Antennenelement dual polarisierbar sein. Deshalb
verlaufen die beiden Koppelschlitze 5 und 6 orthogonal
zueinander, so daß zwei orthogonale Wellenmoden an das
Strahlerelement 2 angekoppelt werden können. Der erste
Koppel-Schlitz 5 liegt auf einer Symmetrielinie 11 des
Strahlerelements 2. Die Symmetrielinie 11 teilt das hier
z.B. rechteckig geformte Strahlerelement 2 in zwei gleich
große Teilflächen.FIG. 2 is a top view of a single dual
To see polarized antenna element, the
dashed bordered area represents the
Eine Speiseleitung 7 überkreuzt den Koppel-Schlitz 5 in
seiner Mitte. Somit wird eine am Eingang 7.1 der
Speiseleitung 7 eingespeiste Welle einer ersten Polarisation
an den Schlitz 5 angekoppelt. Eine über den Schlitz 5
hinausgehende Stichleitung 7.2 dient zur Anpassung der
Leitung 7 an den Schlitz 5.A
Der Koppel-Schlitz 6 für die zweite Polarisation verläuft
senkrecht zum Koppel-Schlitz 5, wobei der Koppel-Schlitz 6
außermittig des Strahlerelements 2 in seinem Randbereich
verläuft. Der Koppel-Schlitz 6 erstreckt sich
spiegelsymmetrisch zur Symmetrielinie 11. Die Ankopplung
eines Wellenmodes mit einer zweiten Polarisation an den
Koppel-Schlitz 6 erfolgt mittels einer als
Leitungsverzweigung 8 ausgebildeten Speiseleitung. Der
Eingang 8.1 der Speiseleitung, an dem die Welle mit der
zweiten Polarisation eingespeist wird, verzweigt sich in
zwei spiegelsymmetrisch zur Symmetrielinie 11 verlaufende
Leitungsarme, von denen jeder den Koppel-Schlitz 6 in einem
Punkt 12, 13 überkreuzt und in jeweils einer zur Anpassung
dienenden Stichleitung 8.2, 8.3 endet. Die völlig
spiegelsymmetrisch zur Symmetrielinie 11 verlaufende
Speiseleitung ist also an zwei ebenfalls spiegelsymmetrisch
zur Symmetrielinie 11 liegenden Punkten 12 und 13 mit dem
Koppel-Schlitz 6 gekoppelt. Wegen der sehr symmetrischen
Schlitz- und Leitungskonfiguration des dual polarisierten
Antennenelements wird eine sehr hohe Entkopplung der
orthogonal zueinander polarisierten Wellenmoden erreicht.
Die Entkopplung wird noch dadurch unterstützt, daß die
Eingänge 7.1 und 8.1 der beiden Speiseleitungen 7 und 8 an
entgegengesetzten Seiten des Strahlelements 2 herausgeführt
sind.The
Eine abgewandelte Ausführungsform des Schlitzes 6 zeigt die
Figur 3. Hier ist der Schlitz 6 in zwei Teilschlitze 6.1 und
6.2 aufgeteilt, die senkrecht und spiegelsymmetrisch zur
Symmetrieachse 11, zu beiden Seiten des Koppel-Schlitzes 5,
verlaufen. Durch die Aufteilung des Schlitzes 6 in zwei
Teilschlitze 6.1 und 6.2 können nun die beiden Teilschlitze
vom Rand des Strahlerelements 2 weg mehr in Richtung seines
Zentrums verschoben werden. Diese Anordnung der Koppel-Schlitze
5 und 6.1, 6.2 ermöglicht eine Reduzierung der
Fläche des Antennenelements. Die beiden Arme der
Leitungsverzweigung der Speiseleitung 8 sind mit jeweils
einem Teilschlitz 6.1, 6.2 in einem Punkt 14 bzw. 15
gekoppelt. Auch hier liegen die beiden Koppelpunkte 14 und
15 wieder spiegelsymmetrisch zur Symmetrielinie 11.A modified embodiment of the
Claims (3)
daß der orthogonal zur Symmetrielinie (11) verlaufende Schlitz (6, 6.1, 6.2) an zwei spiegelsymmetrisch zur Symmetrielinie (11) liegenden Punkten (12, 13, 14, 15) mit einer Speiseleitung (8) gekoppelt ist, die als spiegelsymmetrisch verlaufende Leitungsverzweigung ausgebildet ist.Dual polarized antenna element, consisting of a planar radiator element (2) lying in a first plane, a metallized surface (4) arranged in a second plane, the at least two slots (5, 6, 6.1, 6.2) running below the radiator element (2) and a feed line structure (7, 8) arranged in a third level and coupled to the slots (5, 6, 6.1, 6.2) in the level above, one of the slots (5, 6, 6.1, 6.2) (5 ) on a line of symmetry (11) of the radiator element (2) and at least one further slot (6, 6.1, 6.2) runs orthogonally and mirror-symmetrically to the line of symmetry (11) and the slots (5, 6, 6.1, 6.2) with separate feed lines ( 7, 8) are coupled, characterized in that
that the slot (6, 6.1, 6.2) running orthogonal to the line of symmetry (11) is coupled to a feed line (8) at two points (12, 13, 14, 15) lying mirror-symmetrically to the line of symmetry (11), which feed line runs as a mirror-symmetrical line branch is trained.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19815003A DE19815003A1 (en) | 1998-04-03 | 1998-04-03 | Dual polarized antenna element |
DE19815003 | 1998-04-03 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0948084A2 true EP0948084A2 (en) | 1999-10-06 |
EP0948084A3 EP0948084A3 (en) | 2001-04-04 |
EP0948084B1 EP0948084B1 (en) | 2006-08-30 |
Family
ID=7863510
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99102424A Expired - Lifetime EP0948084B1 (en) | 1998-04-03 | 1999-02-09 | Dual polarised antenna element |
Country Status (3)
Country | Link |
---|---|
US (1) | US6107965A (en) |
EP (1) | EP0948084B1 (en) |
DE (2) | DE19815003A1 (en) |
Cited By (1)
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EP2482383A2 (en) * | 2011-04-19 | 2012-08-01 | Huawei Technologies Co., Ltd. | Microstrip antenna |
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US6288679B1 (en) * | 2000-05-31 | 2001-09-11 | Lucent Technologies Inc. | Single element antenna structure with high isolation |
DE10063437A1 (en) * | 2000-12-20 | 2002-07-11 | Bosch Gmbh Robert | antenna array |
WO2002065581A1 (en) * | 2001-02-14 | 2002-08-22 | Telefonaktiebolaget Lm Ericsson (Publ) | A layered micro strip patch antenna |
BR0116898A (en) * | 2001-02-16 | 2006-01-24 | Ems Technologies Inc | Method and system for producing dual polarization states with controlled rf beam widths |
US6462710B1 (en) | 2001-02-16 | 2002-10-08 | Ems Technologies, Inc. | Method and system for producing dual polarization states with controlled RF beamwidths |
EP1239542B1 (en) * | 2001-03-05 | 2006-06-07 | Marconi Communications GmbH | Multilayered slot-coupled antenna device |
GB2379833A (en) * | 2001-09-18 | 2003-03-19 | Lucent Technologies Inc | Method of testing antennas of a wireless telecommunications base station |
FI20055637A0 (en) * | 2005-12-02 | 2005-12-02 | Nokia Corp | Kaksipolarisaatio-microstrip patch antenna structure |
US20090141110A1 (en) * | 2007-11-30 | 2009-06-04 | Xerox Corporation | Ink-jet printer using phase-change ink for direct on paper printing |
US20090142112A1 (en) * | 2007-11-30 | 2009-06-04 | Xerox Corporation | Phase change ink imaging component having composite outer layer |
CN104733856A (en) * | 2015-03-09 | 2015-06-24 | 华南理工大学 | MIMO antenna decoupled through three gaps |
CN105337037B (en) * | 2015-12-12 | 2019-03-08 | 尚一民 | Dual polarization slot array antenna |
US10714837B1 (en) | 2018-10-31 | 2020-07-14 | First Rf Corporation | Array antenna with dual polarization elements |
CN113161720B (en) * | 2020-01-22 | 2024-01-30 | 华为技术有限公司 | Antenna, base station and terminal with high isolation and low cross polarization level |
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WO1998049741A1 (en) * | 1997-04-30 | 1998-11-05 | Telefonaktiebolaget Lm Ericsson (Publ) | Microwave antenna system and method |
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GB9220414D0 (en) * | 1992-09-28 | 1992-11-11 | Pilkington Plc | Patch antenna assembly |
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WO1997002623A1 (en) * | 1995-07-05 | 1997-01-23 | California Institute Of Technology | A dual polarized, heat spreading rectenna |
-
1998
- 1998-04-03 DE DE19815003A patent/DE19815003A1/en not_active Ceased
-
1999
- 1999-02-09 DE DE59913804T patent/DE59913804D1/en not_active Expired - Lifetime
- 1999-02-09 EP EP99102424A patent/EP0948084B1/en not_active Expired - Lifetime
- 1999-03-12 US US09/267,580 patent/US6107965A/en not_active Expired - Lifetime
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WO1998049741A1 (en) * | 1997-04-30 | 1998-11-05 | Telefonaktiebolaget Lm Ericsson (Publ) | Microwave antenna system and method |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2482383A2 (en) * | 2011-04-19 | 2012-08-01 | Huawei Technologies Co., Ltd. | Microstrip antenna |
EP2482383A4 (en) * | 2011-04-19 | 2012-12-19 | Huawei Tech Co Ltd | Microstrip antenna |
Also Published As
Publication number | Publication date |
---|---|
US6107965A (en) | 2000-08-22 |
DE59913804D1 (en) | 2006-10-12 |
EP0948084B1 (en) | 2006-08-30 |
DE19815003A1 (en) | 1999-10-14 |
EP0948084A3 (en) | 2001-04-04 |
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