EP0989627B1 - Dual frequency antenna - Google Patents

Dual frequency antenna Download PDF

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Publication number
EP0989627B1
EP0989627B1 EP98810946A EP98810946A EP0989627B1 EP 0989627 B1 EP0989627 B1 EP 0989627B1 EP 98810946 A EP98810946 A EP 98810946A EP 98810946 A EP98810946 A EP 98810946A EP 0989627 B1 EP0989627 B1 EP 0989627B1
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EP
European Patent Office
Prior art keywords
conductive layer
frequency
dual frequency
frequency antenna
conductive
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.)
Expired - Lifetime
Application number
EP98810946A
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German (de)
French (fr)
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EP0989627A1 (en
Inventor
Wolfgang Heyde
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Huber and Suhner AG
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Huber and Suhner AG
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Filing date
Publication date
Application filed by Huber and Suhner AG filed Critical Huber and Suhner AG
Priority to DE59806281T priority Critical patent/DE59806281D1/en
Priority to EP98810946A priority patent/EP0989627B1/en
Priority to DK98810946T priority patent/DK0989627T3/en
Priority to ES98810946T priority patent/ES2186997T3/en
Publication of EP0989627A1 publication Critical patent/EP0989627A1/en
Application granted granted Critical
Publication of EP0989627B1 publication Critical patent/EP0989627B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/10—Resonant slot antennas
    • H01Q13/106—Microstrip slot antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
    • 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
    • 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
    • H01Q9/0414—Substantially flat resonant element parallel to ground plane, e.g. patch antenna in a stacked or folded configuration
    • 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
    • H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element
    • 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
    • H01Q9/0442—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular tuning means
    • 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

Definitions

  • the invention relates to a dual frequency antenna for a first frequency band around the frequency f 1 and for a second frequency band around the frequency f 2 , with a conductive layer which has at least one coupling opening, with a small distance from the conductive layer in the area of the coupling openings a stripline network is provided and at least one conductive patch is arranged on the side opposite the coupling openings.
  • a number of dual frequency antennas are from the prior art especially known in microstrip technology. With today's Means of communication arise for various reasons Need to work on multiple frequency bands. It there is therefore a need to cover all frequency ranges as possible to operate with an antenna.
  • the well-known antenna systems like the US 4,771,291, often do not meet the user's expectations for miniaturization, simplicity of construction, robustness in operation and costs.
  • the invention lies Task based on a dual frequency antenna of the aforementioned Art to improve in such a way that it is easier with a better transmission characteristic can be built up.
  • the conductive layer is essentially rectangular, that one edge of the conductive layer is connected to ground, so that the conductive layer has an opposite free end, that the length of the second
  • this layer itself becomes the antenna for a second frequency range because the length of the free end a length corresponding to a quarter of the center frequency of the second frequency band (or a corresponding odd number Multiples) is coordinated.
  • the width of the conductive layer 2 is advantageously approximately 0.25 times to 0.5 times the wavelength ⁇ 2 introduced above.
  • the coupling openings 3 are configured here as a butterfly-shaped opening; for example, two intersecting rectangular coupling openings or other configurations such as an H-shape can also be provided. All forms are suitable which are suitable for emitting a linearly polarized wave.
  • the electrically effective length of the slot is approximately ( ⁇ 1 + ⁇ 2 ) / 8.
  • stripline network 4 can also have a different distribution and arrangement of the strips.
  • the stripline network 4 is fed via a coaxial feed line 9. It is shown in more detail in FIG. 2.
  • this plate 5 is advantageously approximately 0.5 times 0.5 of the wavelength ⁇ 1 introduced above. If the dual frequency antenna is accommodated in a non-conductive housing (not shown in the drawings), this plate 5 can be part of the housing or can be attached to it.
  • the conductive plate 5 or tongue has a length of ⁇ 1/2 and is hereinafter referred to as patch.
  • the space 12 between the patch 5 and the coupling openings 3 can also be filled with a non-conductive material with a high dielectric constant.
  • the patch 5 itself, which is rectangular here, can also be round, polygonal or comprise a series of conductive strips. However, it preferably has the same dimensions as the metallic layer 2.
  • the metallic layer 2 is connected on one side 10 to mass 14 over its entire width. This is represented in FIG. 1 by the lateral contact surface 7 with an indicated ground line 8.
  • the mass 14 may be a plate, in which case, advantageously, the distance between the layer 2 above the ground plane 14, for example, approximately ⁇ 2/10, respectively.
  • the size and shape of the ground surface 14 can essentially be used to set the power component which is emitted in the opposite direction to the main beam direction.
  • the size and shape of the ground surface 14 also have a direct influence on the shape and in particular on the half-value width of the directional diagrams.
  • the main beam direction of the antenna is oriented vertically from the mass surface 14 through the conductive layer 2 and the plate 5 according to the arrow 19.
  • FIG. 2 shows a bottom view of the carrier plate 1, the entire carrier plate 1 being provided with the metallic layer 2 on the top, as in FIG. 1.
  • a carrier plate 1 which has a larger area than the vaporized surface of the metallic layer 2.
  • the contact surface 7 is attached to a larger longitudinal side 10, so that the side edge 11 is shorter.
  • the side edge 11 is dimensioned such that it has the length ⁇ 2/4 or (2n + 1) * ⁇ 2/4 , the wavelength ⁇ 2 corresponding to a second of the two frequencies f 1 and f 2 of the dual frequency antenna.
  • a ground surface is formed by the metallic layer 2, which has a free end 13.
  • this microstrip antenna in two frequency bands.
  • a frequency f 1 which is tuned in a known manner via coupling openings 3 and patch 5
  • the frequency f 2 which is tuned over the length of the free end. So it is possible to specify a dual frequency microstrip antenna with the frequencies used in mobile communications in the 900 and 1800 MHz range, with the conventional part working in the 1800 MHz band and the length of the side edge 11 being dimensioned such that this antenna part in 900 MHz band works.
  • This line 4 must cross the coupling slot 3 so that the Slot is excited. In particular, it can over the middle of the Coupling slot 3 may be arranged away.
  • the length of the pipe section 16 from the center 17 opposite the coupling slot to the open line end 13 and all line transformations from the level of said mid 17 to at the line end at 13 are used to adjust the coupling slot 3 to the 50 Ohm coaxial feed line 9.
  • the inner conductor of the coaxial feed line 9 is soldered to the stripline network and the outer conductor to the conductive layer 2.
  • the line 4 can instead of via the feed line 9 from the antenna also lead away to a processor processing the high-frequency signal Circuit, especially to an amplifier circuit lead, which is provided on the carrier plate 1 itself.
  • the space between the support plate 1 and the ground surface 14 with one for the respective Frequency range of plastic suitable for high-frequency technology be filled.
  • suitable materials are polypropylene, polyethylene and PTFE.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Waveguide Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Description

Die Erfindung betrifft eine Dualfrequenzantenne für ein erstes Frequenzband um die Frequenz f1 und für ein zweites Frequenzband um die Frequenz f2, mit einer leitenden Schicht, die über mindestens eine Koppelöffnung verfügt, wobei in einem geringen Abstand von der leitenden Schicht im Bereich der Koppelöffnungen ein Streifenleiternetzwerk vorgesehen und auf der den Koppelöffnungen gegenüberliegenden Seite mindestens ein leitender Patch angeordnet ist.The invention relates to a dual frequency antenna for a first frequency band around the frequency f 1 and for a second frequency band around the frequency f 2 , with a conductive layer which has at least one coupling opening, with a small distance from the conductive layer in the area of the coupling openings a stripline network is provided and at least one conductive patch is arranged on the side opposite the coupling openings.

Aus dem Stand der Technik sind eine Reihe von Dualfrequenzantennen insbesondere auch in Mikrostriptechnik bekannt. Bei heutigen Kommunikationsmitteln ergibt sich aus verschiedenen Gründen die Notwendigkeit, auf mehreren Frequenzbändern zu arbeiten. Es liegt damit ein Bedarf vor, möglichst alle abzudeckenden Frequenzbereiche mit einer Antenne zu bedienen. Die bekannten Antennensysteme, wie die US 4,771,291, erfüllen dabei häufig nicht die Erwartungen des Anwenders an Miniaturisierung, Einfachheit des Aufbaus, Robustheit im Betrieb und Kosten.A number of dual frequency antennas are from the prior art especially known in microstrip technology. With today's Means of communication arise for various reasons Need to work on multiple frequency bands. It there is therefore a need to cover all frequency ranges as possible to operate with an antenna. The well-known antenna systems, like the US 4,771,291, often do not meet the user's expectations for miniaturization, simplicity of construction, robustness in operation and costs.

Ausgehend von diesem Stand der Technik liegt der Erfindung die Aufgabe zugrunde, eine Dualfrequenzantenne der eingangs genannten Art derart zu verbessern, dass sie in einfacherer Weise mit einer besseren Übertragungscharakteristik aufgebaut werden kann.Based on this prior art, the invention lies Task based on a dual frequency antenna of the aforementioned Art to improve in such a way that it is easier with a better transmission characteristic can be built up.

Diese Aufgabe wird erfindungsgemäss für ein Gerät der eingangs genannten Art dadurch gelöst, dass die leitende Schicht im wesentlichen rechteckig, dass eine Kante der leitenden Schicht an Masse angeschlossen ist, so dass die leitende Schicht über ein gegenüberliegendes freies Ende verfügt, dass die Länge der zweiten Seitenkante der rechteckigen leitenden Schicht eine Länge von ungefähr (2n+1)*λ2/4 aufweist, wobei n eine natürliche Zahl oder Null ist und λ2=c/f2 mit c als relative Lichtgeschwindigkeit gilt, und dass f1 grösser als f2 ist.This object is achieved according to the invention for a device of the type mentioned at the outset in that the conductive layer is essentially rectangular, that one edge of the conductive layer is connected to ground, so that the conductive layer has an opposite free end, that the length of the second The side edge of the rectangular conductive layer has a length of approximately (2n + 1) * λ 2/4 , where n is a natural number or zero and λ 2 = c / f 2 with c as the relative speed of light, and that f 1 is greater than f is 2 .

Dadurch, dass die eine Seitenkänte der leitenden Schicht an Masse angeschlossen ist, wird diese Schicht selber zur Antenne für einen zweiten Frequenzbereich, da die Länge des freien Endes auf eine Länge entsprechend einem Viertel der Mittelfrequenz des zweiten Frequenzbandes (oder einem entsprechenden ungeradzahligen Vielfachen) abgestimmt ist.Because one side edge of the conductive layer is grounded is connected, this layer itself becomes the antenna for a second frequency range because the length of the free end a length corresponding to a quarter of the center frequency of the second frequency band (or a corresponding odd number Multiples) is coordinated.

Nachfolgend wird ein Ausführungsbeispiel der Erfindung anhand der beigefügten Zeichnungen dargestellt. Es zeigen:

Fig. 1
eine schematisches Bild einer Dualfrequenzantenne gemäss der Erfindung, und
Fig. 2
eine Unteransicht der Antenne nach Fig. 1.
An exemplary embodiment of the invention is illustrated below with reference to the accompanying drawings. Show it:
Fig. 1
a schematic picture of a dual frequency antenna according to the invention, and
Fig. 2
a bottom view of the antenna of FIG. 1st

Die Fig. 1 zeigt eine Dualfrequenzantenne gemäss der Erfindung in einer perspektivischen Ansicht. Es handelt sich um eine Mikrostripantenne, die über eine nichtleitende Trägerplatte 1 verfügt, die vorzugsweise aus einem Faserverbundwerkstoff hergestellt ist. Auf der einen Seite der Trägerplatte 1 ist eine metallische Schicht 2 mit Koppelöffnungen 3 aufgetragen, auf der anderen Seite ist das in der Fig. 2 dargestellte Streifenleiternetzwerk 4 vorgesehen. Die Breite der leitenden Schicht 2 beträgt vorteilhafterweise ca. 0,25fache bis 0,5fache der oben eingeführten Wellenlänge λ2. Die Koppelöffnungen 3 sind hier als eine schmetterlingsförmige Öffnung ausgestaltet, es können beispielsweise auch zwei sich kreuzende rechteckige Koppelöffnungen oder andere Ausgestaltungen wie eine H-Form vorgesehen sein. Alle Formen sind geeignet, die geeignet sind, eine linear polarisierte Welle abzustrahlen. Die elektrisch wirksame Länge des Schlitzes beträgt ungefähr (λ1+λ2)/8. 1 shows a dual frequency antenna according to the invention in a perspective view. It is a microstrip antenna that has a non-conductive carrier plate 1, which is preferably made of a fiber composite material. A metallic layer 2 with coupling openings 3 is applied to one side of the carrier plate 1, and the stripline network 4 shown in FIG. 2 is provided on the other side. The width of the conductive layer 2 is advantageously approximately 0.25 times to 0.5 times the wavelength λ 2 introduced above. The coupling openings 3 are configured here as a butterfly-shaped opening; for example, two intersecting rectangular coupling openings or other configurations such as an H-shape can also be provided. All forms are suitable which are suitable for emitting a linearly polarized wave. The electrically effective length of the slot is approximately (λ 1 + λ 2 ) / 8.

Die gleichen Möglichkeiten gelten für das Streifenleiternetzwerk 4. Dieses Streifenleiternetzwerk 4 kann auch eine andere Verteilung und Anordnung der Streifen aufweisen. Das Streifenleiternetzwerk 4 wird über eine koaxiale Speiseleitung 9 gespeist. Es ist näher in der Fig. 2 dargestellt.The same options apply to the stripline network 4. This stripline network 4 can also have a different distribution and arrangement of the strips. The stripline network 4 is fed via a coaxial feed line 9. It is shown in more detail in FIG. 2.

In einem kleinen räumlichen Abstand von der Trägerplatte 1 und damit von der Schicht 2 von z.B. ungefähr λ1/10 ist auf der den Koppelöffnungen 3 zugewandten Seite eine leitende Platte 5 angeordnet, die beispielsweise durch nicht leitende Distanzhalter 6 gehalten wird. Die Grösse dieser Platte 5 beträgt vorteilhafterweise ca. 0,5 mal 0,5 der oben eingeführten Wellenlänge λ1. Wenn die Dualfrequenzantenne in einem (in den Zeichnungen nicht dargestellten) nicht leitenden Gehäuse untergebracht ist, so kann diese Platte 5 Bestandteil des Gehäuses sein oder an diesem befestigt werden.Approximately in a small spatial distance from the carrier plate 1 and thus of the layer 2 of, for example λ 1 / 10th is on the coupling openings 3 facing side disposed a conductive plate 5 which is maintained, for example, by non-conductive spacers. 6 The size of this plate 5 is advantageously approximately 0.5 times 0.5 of the wavelength λ 1 introduced above. If the dual frequency antenna is accommodated in a non-conductive housing (not shown in the drawings), this plate 5 can be part of the housing or can be attached to it.

Die leitende Platte 5 oder Zunge weist eine Länge von λ1/2 auf und wird im folgenden Patch genannt. Der Zwischenraum 12 zwischen dem Patch 5 und den Koppelöffnungen 3 kann auch durch ein nicht leitendes Material mit einer hohen Dielektrizitätskonstante gefüllt sein. Der hier rechteckige Patch 5 selber kann auch rund, vieleckig sein oder eine Reihe von leitenden Streifen umfassen. Vorzugsweise weist er aber im Verhältnis die gleichen Dimensionen wie die metallische Schicht 2 auf.The conductive plate 5 or tongue has a length of λ 1/2 and is hereinafter referred to as patch. The space 12 between the patch 5 and the coupling openings 3 can also be filled with a non-conductive material with a high dielectric constant. The patch 5 itself, which is rectangular here, can also be round, polygonal or comprise a series of conductive strips. However, it preferably has the same dimensions as the metallic layer 2.

Die metallische Schicht 2 ist an ihrer einen Seite 10 über ihre gesamte Breite an Masse 14 angeschlossen. Dies ist in der Fig. 1 durch die seitliche Kontaktfläche 7 mit einer angedeuteten Masseleitung 8 dargestellt. Die Masse 14 kann eine Platte sein, wobei dann vorteilhafterweise der Abstand der Schicht 2 über der Massefläche 14 z.B. ungefähr λ2/10 betragen. Über die Grösse und Form der Massefläche 14 kann im wesentlichen der Leistungsanteil eingestellt werden, der entgegengesetzt zur Hauptstrahlrichtung abgestrahlt wird. Grösse und Form der Massefläche 14 haben auch direkten Einfluss auf die Form und insbesondere auf die Halbwertsbreite der Richtdiagramme. Die Hauptstrahlrichtung der Antenne ist vertikal von der Massenfläche 14 abgehend durch die leitende Schicht 2 und die Platte 5 hindurch gemäss dem Pfeil 19 ausgerichtet.The metallic layer 2 is connected on one side 10 to mass 14 over its entire width. This is represented in FIG. 1 by the lateral contact surface 7 with an indicated ground line 8. The mass 14 may be a plate, in which case, advantageously, the distance between the layer 2 above the ground plane 14, for example, approximately λ 2/10, respectively. The size and shape of the ground surface 14 can essentially be used to set the power component which is emitted in the opposite direction to the main beam direction. The size and shape of the ground surface 14 also have a direct influence on the shape and in particular on the half-value width of the directional diagrams. The main beam direction of the antenna is oriented vertically from the mass surface 14 through the conductive layer 2 and the plate 5 according to the arrow 19.

Die Fig. 2 zeigt eine Unteransicht der Trägerplatte 1, wobei wie in der Fig. 1 die gesamte Trägerplatte 1 auf der Oberseite mit der metallischen Schicht 2 versehen ist. Natürlich ist auch das Vorhandensein einer Trägerplatte 1 möglich, die eine grössere Fläche aufweist als die bedampfte Fläche der metallischen Schicht 2. In der folgenden Beschreibung wird von einer vollständig bedampften Trägerplatte ausgegangen. Die Kontaktfläche 7 ist an einer grösseren Längsseite 10 angebracht, so dass die Seitenkante 11 kürzer ist. Die Seitenkante 11 ist so bemessen, dass sie die Länge λ2/4 bzw. (2n+1)*λ2/4 aufweist, wobei die Wellenlänge λ2 einer zweiten der beiden Frequenzen f1 und f2 der Dualfrequenzantenne entspricht. Dadurch wird durch die metallische Schicht 2 eine Massefläche gebildet, die ein freies Ende 13 aufweist. Es ist damit möglich, diese Mikrostripantenne in zwei Frequenzbändern zu betreiben. Zum einen mit einer Frequenz f1, die in bekannter Weise über Koppelöffnungen 3 und Patch 5 abgestimmt ist, und zum anderen mit der Frequenz f2, die über die Länge des freien Endes abgestimmt ist. So ist es möglich, eine Dualfrequenz-Mikrostripantenne mit den im Mobilfunk verwendeten Frequenzen im 900 und 1800 MHz-Bereich anzugeben, wobei im konventionellen Teil im 1800 MHz-Band gearbeitet wird und wobei die Länge der Seitenkante 11 so bemessen ist, dass dieser Antennenteil im 900 MHz-Band arbeitet.FIG. 2 shows a bottom view of the carrier plate 1, the entire carrier plate 1 being provided with the metallic layer 2 on the top, as in FIG. 1. Of course, it is also possible to have a carrier plate 1 which has a larger area than the vaporized surface of the metallic layer 2. In the following description, a completely vaporized carrier plate is assumed. The contact surface 7 is attached to a larger longitudinal side 10, so that the side edge 11 is shorter. The side edge 11 is dimensioned such that it has the length λ 2/4 or (2n + 1) * λ 2/4 , the wavelength λ 2 corresponding to a second of the two frequencies f 1 and f 2 of the dual frequency antenna. As a result, a ground surface is formed by the metallic layer 2, which has a free end 13. It is therefore possible to operate this microstrip antenna in two frequency bands. On the one hand with a frequency f 1 , which is tuned in a known manner via coupling openings 3 and patch 5, and on the other hand with the frequency f 2 , which is tuned over the length of the free end. So it is possible to specify a dual frequency microstrip antenna with the frequencies used in mobile communications in the 900 and 1800 MHz range, with the conventional part working in the 1800 MHz band and the length of the side edge 11 being dimensioned such that this antenna part in 900 MHz band works.

Natürlich sind neben der Anwendung im Mobilfunkbereich auch andere Einsatzgebiete möglich, bei denen eine Empfindlichkeit für zwei Frequenzbänder notwendig ist, deren Frequenzabstand vorzugsweise 1:1,5 überschreitet. Of course, in addition to the application in the mobile radio sector, there are also others Areas of application possible in which a sensitivity for two frequency bands is necessary, the frequency spacing is preferred 1: 1.5 exceeds.

Der Koppelschlitz 3, der durch das Material der Platte 2 nicht hindurch erkennbar ist, liegt genau gegenüber dem Streifen 4, der durch diese sogenannte Mikrostreifenleitung angeregt wird. Diese Leitung 4 muss den Koppelschlitz 3 queren, damit der Schlitz angeregt wird. Insbesondere kann sie über die Mitte des Koppelschlitzes 3 hinweg angeordnet sein. Die Länge des Leitungsstückes 16 von der Mitte 17 gegenüberliegend des Kopplungsschlitzes bis ans offene Leitungsende 13 sowie sämtliche Leitungstransformationen von der Ebene der besagten Mitte 17 bis ans Leitungsende bei 13 dienen zum Anpassen des Koppelschlitzes 3 an die 50 Ohm koaxiale Speiseleitung 9. Der Innenleiter der koaxialen Speiseleitung 9 wird an das Streifenleiternetzwerk angelötet und der Aussenleiter an die leitende Schicht 2.The coupling slot 3, which is not due to the material of the plate 2 can be seen through, lies exactly opposite the strip 4, which is excited by this so-called microstrip line. This line 4 must cross the coupling slot 3 so that the Slot is excited. In particular, it can over the middle of the Coupling slot 3 may be arranged away. The length of the pipe section 16 from the center 17 opposite the coupling slot to the open line end 13 and all line transformations from the level of said mid 17 to at the line end at 13 are used to adjust the coupling slot 3 to the 50 Ohm coaxial feed line 9. The inner conductor of the coaxial feed line 9 is soldered to the stripline network and the outer conductor to the conductive layer 2.

Die Leitung 4 kann anstatt über die Speiseleitung 9 von der Antenne wegzuführen auch zu einer das Hochfrequenzsignal verarbeitenden Schaltung, insbesondere auch zu einer Verstärkerschaltung führen, die auf der Trägerplatte 1 selbst vorgesehen ist.The line 4 can instead of via the feed line 9 from the antenna also lead away to a processor processing the high-frequency signal Circuit, especially to an amplifier circuit lead, which is provided on the carrier plate 1 itself.

Neben dem Zwischenraum 12 kann auch der Zwischenraum zwischen der Trägerplatte 1 und der Massefläche 14 mit einem für den jeweiligen Frequenzbereich hochfrequenztechnisch geeigneten Kunststoff gefüllt sein. Beispiele für solche hier geeigneten Materialien sind Polypropylen, Polyethylen und PTFE.In addition to the space 12, the space between the support plate 1 and the ground surface 14 with one for the respective Frequency range of plastic suitable for high-frequency technology be filled. Examples of such suitable materials here are polypropylene, polyethylene and PTFE.

Claims (4)

  1. A dual frequency antenna for a first frequency band around the frequency f1 and a second frequency band around the frequency f2, comprising a conductive layer (2) having at least one coupling opening (3), wherein a strip transmission line network (4) is provided in the neighbourhood of the coupling openings (3) at a short distance from the conductive layer (2) and at least one conductive patch (5) is disposed on the side opposite the coupling openings (3), characterised in that the conductive layer (2) is substantially rectangular, one edge (10) of the conductive layer (2) is connected to earth, so that the conductive layer (2) has an opposite free end (13), and the length of the second side edge (11) of the rectangular conductive layer (2) is about (2n+1)*λ2/4, wherein n is a natural number or zero and λ2=c/f2 where c is the relative speed of light and f1 is greater than f2.
  2. A dual frequency antenna according to claim 1, characterised in that the space (12) between the conductive layer and the patch (5) and/or the space between the strip transmission line network (4) and a surface (14) constituting the earth is filled with a dielectric.
  3. A dual frequency antenna according to claim 1 or 2, characterised in that one edge (10) of the conductive layer (2) is connected to earth (14) across its entire width.
  4. A dual frequency antenna according to claim 3, characterised in that the edge (10) is connected to earth (14) via a conductive surface disposed at right angles to the layer (2) and extending away from the patch (5).
EP98810946A 1998-09-21 1998-09-21 Dual frequency antenna Expired - Lifetime EP0989627B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE59806281T DE59806281D1 (en) 1998-09-21 1998-09-21 Dual-frequency antenna
EP98810946A EP0989627B1 (en) 1998-09-21 1998-09-21 Dual frequency antenna
DK98810946T DK0989627T3 (en) 1998-09-21 1998-09-21 Dual Frequency Antenna
ES98810946T ES2186997T3 (en) 1998-09-21 1998-09-21 DUAL FREQUENCY ANTENNA.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98810946A EP0989627B1 (en) 1998-09-21 1998-09-21 Dual frequency antenna

Publications (2)

Publication Number Publication Date
EP0989627A1 EP0989627A1 (en) 2000-03-29
EP0989627B1 true EP0989627B1 (en) 2002-11-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP98810946A Expired - Lifetime EP0989627B1 (en) 1998-09-21 1998-09-21 Dual frequency antenna

Country Status (4)

Country Link
EP (1) EP0989627B1 (en)
DE (1) DE59806281D1 (en)
DK (1) DK0989627T3 (en)
ES (1) ES2186997T3 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2819109A1 (en) * 2001-01-04 2002-07-05 Cit Alcatel MULTI-BAND ANTENNA FOR MOBILE DEVICES
US6429819B1 (en) * 2001-04-06 2002-08-06 Tyco Electronics Logistics Ag Dual band patch bowtie slot antenna structure

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4771291A (en) * 1985-08-30 1988-09-13 The United States Of America As Represented By The Secretary Of The Air Force Dual frequency microstrip antenna
JPH03263903A (en) * 1989-04-28 1991-11-25 Misao Haishi Miniature antenna
FR2664749B1 (en) * 1990-07-11 1993-07-02 Univ Rennes MICROWAVE ANTENNA.
AU2948195A (en) * 1994-07-29 1996-03-04 Wireless Access, Inc. Partially shorted double ring microstrip antenna having a microstrip feed

Also Published As

Publication number Publication date
ES2186997T3 (en) 2003-05-16
EP0989627A1 (en) 2000-03-29
DK0989627T3 (en) 2003-03-10
DE59806281D1 (en) 2002-12-19

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