EP1267439B1 - Antenne multibandes utilisant deux antennes imbriquées et concentriques, l'antenne extérieure étant du type en méandres - Google Patents

Antenne multibandes utilisant deux antennes imbriquées et concentriques, l'antenne extérieure étant du type en méandres Download PDF

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Publication number
EP1267439B1
EP1267439B1 EP02253367A EP02253367A EP1267439B1 EP 1267439 B1 EP1267439 B1 EP 1267439B1 EP 02253367 A EP02253367 A EP 02253367A EP 02253367 A EP02253367 A EP 02253367A EP 1267439 B1 EP1267439 B1 EP 1267439B1
Authority
EP
European Patent Office
Prior art keywords
antenna
antenna element
portions
frequency bands
frequency band
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
EP02253367A
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German (de)
English (en)
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EP1267439A1 (fr
Inventor
Man Wei Lee
Huan Fong Tan
Beng Tiek Yap
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HP Inc
Original Assignee
Hewlett Packard Co
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Publication of EP1267439A1 publication Critical patent/EP1267439A1/fr
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Anticipated expiration legal-status Critical
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
    • 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
    • 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
    • H01Q1/362—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith for broadside radiating helical antennas
    • 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

Definitions

  • the present invention generally relates to antennas adapted to operate in multiple frequency bands, and more particularly to multi band antennas used for wireless communication systems such as cellular telephone systems.
  • Wireless communication systems e. g. cellular telephone systems
  • RF radio frequency
  • the standards differ from each other significantly in their operating frequency ranges.
  • GSM Global System for Mobile communication
  • AMPS Advanced Mobile Phone System
  • GSM Global System for Mobile communication
  • AMPS Advanced Mobile Phone System
  • DCS Digital Communication System
  • PCS Personal Communication System
  • Cellular telephone devices used for wireless communication systems necessarily include an antenna for receiving and transmitting radio frequency signals such as the widely employed monopole antennas. Since the resonating frequency of an antenna depends on the length of the antenna in a known manner due to the wavelength of the RF-waves, a certain antenna can be used only for a certain frequency range. Due to the different standards, however, it is desirable that one and the same cellular telephone device is able to operate within widely separated frequency bands in order to utilize more than one standard. Therefore, an antenna adapted to operate in multiple frequency bands is needed.
  • Helix antennas typically include a conducting member wound in a helical pattern. As the radiating element of a helix antenna is wound about an axis, the axial length of the helix antenna can be considerably less than the length of a comparable monopole antenna. Hence, helix antennas can be used where the length of a monopole antenna is too extended.
  • an antenna to be relatively compact in size and to be capable of operating in multiple widely separated frequency bands such as GSM and PCS.
  • Small multi band antennas providing adequate bandwidth in at least two frequency bands are known.
  • U.S. Pat. No. 6,075,488 to Hope discloses a broadband antenna that includes a centrally positioned high frequency-radiating element surrounded by a dielectric support element, and a linear radiating element in the form of a wire wound over the dielectric support element and extending generally over the entire length of centrally positioned high frequency radiating element, thus defining an over-wound helical coil.
  • the length of the linear radiating element is such that it supports resonance at a lower frequency.
  • Such an antenna can resonate at two broadly separated frequencies and, therefore, is configured for dual frequency band operation.
  • U.S. Pat. No. 6,127,979 to Zhou et al. reveals a multi band antenna that comprises a fixed whip antenna element and a helical coil antenna element coupled to a single feed point.
  • the antenna is reduced in size by attaching a disc to the end of the whip antenna element, while decreasing the pitch of the helical coil antenna element.
  • a dielectric material surrounds the whip antenna element and provides support for the helical coil antenna element.
  • Document WO 00/65684 discloses an antenna having first and second bent antenna elements connected in series by web segments in such a way and to reproduce a helix.
  • An additional antenna element can run parallel to the helical arrangement.
  • an antenna according to claim 1 there is provided an antenna according to claim 1.
  • the second portions can extend parallel to the elongated conductor of the first antenna element.
  • the first portions can extend concentric to the elongated conductor of the first antenna element.
  • the first portions and the second portions can be perpendicular.
  • one first portion can be arranged at the top and another first portion can be arranged at the bottom of the second antenna element.
  • the first portion arranged at the bottom of said second antenna element can be formed as a closed ring.
  • the first antenna element is a fixed whip antenna.
  • the first antenna element can have a disk on the top of the substantially elongated conductor.
  • the antenna can comprise a RF matching network that matches the first antenna element and the second antenna element.
  • the antenna comprises a dielectric material surrounding the first antenna element, wherein the substantially meandering coil of the second antenna element is supported by the dielectric material.
  • the second antenna element can be made of a punched-out metal sheet or of a formed plastic that is plated with copper.
  • the second frequency band is one of a GSM and AMPS band and the first frequency band is one of a DCS and PCS band.
  • Antennas according to the described embodiments are particularly well suited for operation within wireless communiction systems such as cellular telephone systems utilizing multiple, widely and separated frequency bands. Furthermore, because of their small size, such antennas can be employed within very small communications devices. Besides, because the second antenna element having the form of a substantially meandering coil comprises a plurality of first portions having a wound form and a plurality of second portions having a straight form, wherein the first portion extends from an upper end of said second portion to a lower end of a subsequent second portion following in axial direction of the second antenna element, antennas according to the present invention can be manufactured with a steady performance.
  • the second antenna element according to the present invention is more rigid and can be manufactured more accurately in the pitch than conventional helix antenna elements. As a result, the distance between the top of the first high frequency antenna element and the corresponding end of the second low frequency antenna element is easy to keep constant.
  • FIG. 1 illustrates a dual band antenna 1 constructed and operative in accordance with an embodiment of the present invention.
  • the antenna 1 comprises an outer housing or overmold 2, which is used to protect and hold together the whole antenna structure.
  • the overmold 2 which defines the appearance of the antenna 1 as well, there is a first antenna element 3 for receiving and transmitting signals in a high frequency band, i.e. in the DCS band.
  • the first antenna element 3 has a substantially elongated conductor or monopole, which elongated conductor forms a fixed whip antenna and which is coupled to a feed point 4.
  • the feed point 4 extends to a coupling portion 5, which is electrically connected to a RF matching network 15 as shown in FIG. 8.
  • the RF matching network 1 5 is used to match the impedance of the antenna to 1 that of a T/R switch 16 and comprises several capacitors and inductors.
  • the functioning of a similar RF matching network 16 is described in U.S. Pat. 6,127,979, the disclosure of which is incorporated herein by reference.
  • the antenna 1 further comprises a dielectric material 6 such as santoprene or polypropylene, which surrounds the first antenna element 3, and a second antenna element 7 for receiving and transmitting signals in a lower frequency band, i. e. in the GSM band. Both the first antenna element 3 and the second antenna element 7 are coupled to the feed point 4.
  • the second antenna element 7 also has a substantially meandering coil of a predetermined pitch, which is supported by the dielectric material 6.
  • the dielectric material 6 holds the elongated conductor of the first antenna element 3, thereby ensuring concentricity of the elongated conductor within the substantially meandering coil of the second antenna element 7.
  • the dielectric material 6 holds a disc 8 that is set on the top of the substantially elongated conductor to shorten the overall length of the antenna 1.
  • the dielectric material 6 is no longer required for securing the distance between the top of the second antenna element 7 and the disc 8. The reason for this is the rigidity of the second antenna element 7 caused by the substantially meandering coil.
  • FIGS. 2 and 3 two variations of the substantially meandering coil of the second antenna element 7 according to preferred embodiments of the present invention are shown.
  • the substantially meandering coil illustrated in FIG. 2 comprises a plurality of first portions 7a and a plurality of second portions 7b.
  • the first portions 7a have a wound form that concentrically surrounds the elongated conductor of the first antenna element 3 in the assembled position of the antenna 1. Since FIG. 2 is a plan view, the wound form of the first portions 7a cannot be seen.
  • the second portions 7b have a straight form so that they extend parallel to the elongated conductor of the first antenna element 3 in the assembled position of the antenna 1. Because the first portions 7a concentrically surround the elongated conductor, the first portions 7a and the second portions 7b are perpendicular.
  • FIG. 2 clearly depicts that the second portions 7b are arranged so that a single first portion 7a extends from the upper end of a second portion 7b to the lower end of a subsequent second portion 7b following in the axial direction of the second antenna element 7.
  • FIG. 3 shows a substantially meandering coil according to a second embodiment of the present invention, which is similar to the second antenna element 7 described above.
  • FIG. 3 is a perspective view, which clearly shows that the first portions 7a have a wound form surrounding partly the elongated conductor of the first antenna element 3.
  • the substantially meandering coil according to FIG. 3 has one first portion 7a that is arranged at the top of the second antenna element 7 and another first portion 7a that is arranged at the bottom of the second antenna element 7. Because of the first portions 7a arranged at the top and the bottom of the second antenna element 7, a precise pitch of the substantially meandering coil can easily be provided.
  • the first portion 7a arranged at the bottom of the second antenna element 7 is formed as a closed ring.
  • the inside diameter of the ring corresponds to the diameter of the elongated conductor or monopole of the first antenna element 3, thus, allowing a centering of first antenna element 3 and second antenna element 7.
  • the second antenna element 7 according to FIGS. 4 and 5 comprises first portions 7a both at the top and the bottom of the substantially meandering coil. Contrary to the second antenna element 7 of FIG. 3, the first portions 7a of the substantially meandering coil have an almost completely closed ring form. Consequently, the first portions 7a nearly entirely surround the elongated conductor of the first antenna element 3.
  • the substantially meandering coil according to FIGS. 4 and 5 can be simply made of a metal sheet by appropriate punching out and bending. The thickness of the metal sheet ensures a satisfactory rigidity of the second antenna element 7. Alternatively, the substantially meandering coil can be made of a formed plastic that is plated with copper or any right metal.
  • FIG. 4 illustrates the components of the antenna 1 in an exploded view.
  • FIG. 5 shows the components of FIG. 4 in an assembled position of the antenna 1, but without the dielectric material 6 and the overmold 2.
  • the antenna 1 can simply be assembled by introducing both the first antenna element 3 and the second antenna element 7 in appropriate recesses 9, 10 of the feed point 4, thereby fixing and aligning the elongated conductor of the first antenna element 3 and the substantially meandering coil of the second antenna element 7.
  • the dielectric material 6 secures a reliable and lasting alignment of first antenna element 3 and second antenna element 7.
  • the cylindrical dielectric material 6 has a bore 11 for receiving the elongated conductor or monopole of the first antenna element 3, a supporting surface 12 for supporting the disc 8 of the first antenna element 3, and an outside diameter adapted to the internal diameter of the substantially meandering coil.
  • the substantially meandering coil of the second antenna element 7 comprises a plurality of first portions 7a and a plurality of second portions 7b.
  • the second antenna element 7 illustrated in FIG. 6 consists of a flexible foil, in particular a flexible PCB, which can be wrapped around the first antenna element 3 or the dielectric material 6 surrounding the first antenna element 3.
  • FIG. 7 illustrates a graph showing the return loss R in 2 dB increments as a function of frequency f.
  • the antenna according to the present invention operates signals in frequency bands of about 830 MHz to about 960 MHz and of about 1710 MHz to about 1990 MHz, which cover the widespread standards of GSM, AMPS, DCS and PCS. While the present example sets forth that the high and low frequency bands are DCS and GSM bands, respectively, one skilled in the art will appreciate that other combinations of frequency bands may be implemented by modifying the length of the first antenna element 3 and the second antenna element 7. For example, other possible combinations of low and high bands could include GSM + PCS, AMPS + DCS, AMPS + PCS, or any other combination of one and more lower and higher frequency bands of known standards.
  • FIG. 9 shows a 3-dimensional perspective view of how the antenna 1 can be interfaced to a system. This will form part of the antenna feeding mechanism to the transceiver.
  • the coupling portion 5 is connected to mechanical and electrical contacts 13 which are arranged in the housing 14 of the system, the antenna 1 is connected to. Via the mechanical and electrical contacts 13, the antenna 1 is coupled to the respective network in the system.
  • the antenna 1 discussed above by means of preferred embodiments operates as the prior art dual band antennas over a wide frequency range and is comparatively small sized. Therefore, the antenna 1 is particularly well suited for operation within wireless communication systems, e. g. cellular telephone devices.
  • the antenna 1 of the present invention improves the production with regard to a steady performance of the antenna.
  • the reason for this is that the second antenna element 7 is more rigid and can be manufactured more accurately in the pitch than conventional helix antenna elements because of the inventive arrangement of first portions 7a and second portions 7b.
  • the distance between the disc 8 on the top of the elongated conductor of the first antenna element 7 and the adjacent end of the first portion 7a arranged at the top of the substantially meandering coil is easy to keep constant.

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

Claims (9)

  1. Antenne multibandes comprenant :
    une antenne fouet fixe comme premier élément d'antenne (3) destiné à recevoir et émettre des signaux dans une première bande de fréquence comportant un conducteur sensiblement allongé comportant une première extrémité et une seconde extrémité, la seconde extrémité étant couplée à un point d'alimentation (4) ;
    un second élément d'antenne (7) destiné à recevoir et émettre des signaux dans une seconde bande de fréquence comportant une spire sensiblement en méandres d'un second pas prédéterminé et comportant une première extrémité et une seconde extrémité, la seconde extrémité étant couplée audit point d'alimentation (4) ;
    ladite spire sensiblement en méandres comprenant une pluralité de premières parties (7a) ayant une forme enroulée et entourant au moins partiellement ledit premier élément d'antenne (3), et une pluralité de secondes parties (7b) ayant une forme droite ; dans laquelle la distance à partir de la première extrémité de la première antenne jusqu'à la première extrémité de la seconde antenne est sensiblement constante
       caractérisée en ce que
       ladite première partie (7a) s'étend à partir d'une extrémité de ladite seconde partie (7b) jusqu'à une seconde partie suivante (7b) en suivant le sens axial du second élément d'antenne (7) ; ledit second élément d'antenne (7) étant fait à partir d'une feuille de métal perforée ou d'une matière plastique plaquée de cuivre ou d'un autre métal ou d'un alliage métallique.
  2. Antenne selon la revendication 1, dans laquelle lesdites secondes parties (7b) s'étendent de façon sensiblement parallèle audit conducteur allongé dudit premier élément d'antenne (3).
  3. Antenne (1) selon la revendication 1 ou 2, dans laquelle lesdites premières parties (7a) s'étendent de façon sensiblement concentrique par rapport audit conducteur allongé dudit premier élément d'antenne (3).
  4. Antenne (1) selon la revendication 1, 2 ou 3, dans laquelle lesdites premières parties (7a) et lesdites secondes parties (7b) sont sensiblement perpendiculaires les unes par rapport aux autres.
  5. Antenne (1) selon l'une quelconque des revendications précédentes, dans laquelle une première partie (7a) est agencée au sommet et une autre première partie (7a) est agencée en bas dudit second élément d'antenne (3), ladite première partie (7a) agencée en bas dudit second élément d'antenne ayant de préférence la forme d'un anneau fermé.
  6. Antenne selon la revendication 1, dans laquelle ledit premier élément d'antenne (3) comporte un disque sur le sommet dudit conducteur sensiblement allongé.
  7. Antenne selon l'une quelconque des revendications précédentes, comprenant un réseau d'adaptation RF adaptant ledit premier élément d'antenne (3) et ledit second élément d'antenne (7).
  8. Antenne selon l'une quelconque des revendications précédentes, comprenant un matériau diélectrique entourant sensiblement ledit premier élément d'antenne (3), dans laquelle ladite spire sensiblement en méandres dudit second élément d'antenne (7) est supportée par ledit matériau diélectrique.
  9. Antenne selon l'une quelconque des revendications précédentes, dans laquelle ladite seconde bande de fréquence est une bande de fréquence parmi une bande GSM et AMPS et ladite première bande de fréquence est une bande de fréquence parmi une bande SCD et SCP.
EP02253367A 2001-06-15 2002-05-14 Antenne multibandes utilisant deux antennes imbriquées et concentriques, l'antenne extérieure étant du type en méandres Expired - Lifetime EP1267439B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SG200103546 2001-06-15
SG200103546 2001-06-15

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EP1267439A1 EP1267439A1 (fr) 2002-12-18
EP1267439B1 true EP1267439B1 (fr) 2005-07-27

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EP02253367A Expired - Lifetime EP1267439B1 (fr) 2001-06-15 2002-05-14 Antenne multibandes utilisant deux antennes imbriquées et concentriques, l'antenne extérieure étant du type en méandres

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JP (1) JP2003037418A (fr)
DE (1) DE60205181T2 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005176302A (ja) 2003-09-26 2005-06-30 Nec Access Technica Ltd 携帯端末のアンテナ装置および放送波を受信可能な無線機
KR100616545B1 (ko) * 2004-05-04 2006-08-29 삼성전기주식회사 이중 커플링 급전을 이용한 다중밴드용 적층형 칩 안테나
US7286090B1 (en) 2006-03-29 2007-10-23 Hong Kong Applied Science And Technology Research Institute Co., Ltd. Meander feed structure antenna systems and methods
JP4971212B2 (ja) * 2008-01-31 2012-07-11 日本アンテナ株式会社 ヘリカルホイップアンテナ
KR101379123B1 (ko) 2010-12-17 2014-03-31 주식회사 케이티 광대역 단일 공진 안테나
KR101446248B1 (ko) 2010-12-29 2014-10-01 주식회사 케이티 선형 배열을 이용한 외장형 안테나

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997018601A1 (fr) * 1995-11-15 1997-05-22 Allgon Ab Antenne a double bande
SE509638C2 (sv) * 1996-06-15 1999-02-15 Allgon Ab Meanderantennanordning
US6127979A (en) * 1998-02-27 2000-10-03 Motorola, Inc. Antenna adapted to operate in a plurality of frequency bands
CN1162940C (zh) * 1999-04-21 2004-08-18 西门子公司 天线,这种天线的应用和制造这种天线的方法

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DE60205181D1 (de) 2005-09-01
EP1267439A1 (fr) 2002-12-18
JP2003037418A (ja) 2003-02-07
DE60205181T2 (de) 2006-06-01

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