EP1225655A1 - Dualband Planarantenne und dieses enthaltendes Gerät - Google Patents

Dualband Planarantenne und dieses enthaltendes Gerät Download PDF

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Publication number
EP1225655A1
EP1225655A1 EP01403150A EP01403150A EP1225655A1 EP 1225655 A1 EP1225655 A1 EP 1225655A1 EP 01403150 A EP01403150 A EP 01403150A EP 01403150 A EP01403150 A EP 01403150A EP 1225655 A1 EP1225655 A1 EP 1225655A1
Authority
EP
European Patent Office
Prior art keywords
antenna
area
patch
slot
periphery
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.)
Granted
Application number
EP01403150A
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English (en)
French (fr)
Other versions
EP1225655B1 (de
Inventor
Kouam Charles Ngounou
Jean-Philippe Coupez
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.)
Alcatel Lucent SAS
Original Assignee
Alcatel CIT SA
Alcatel SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Alcatel CIT SA, Alcatel SA filed Critical Alcatel CIT SA
Publication of EP1225655A1 publication Critical patent/EP1225655A1/de
Application granted granted Critical
Publication of EP1225655B1 publication Critical patent/EP1225655B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01Q9/0421—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
    • 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
    • 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
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/321—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors within a radiating element or between connected radiating elements
    • 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
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • H01Q5/364—Creating multiple current paths
    • 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

Definitions

  • the present invention relates generally to radio devices transmission, in particular portable radiotelephones, and it concerns more particularly the antennas which are produced according to the technique of microstrips to be included in such devices.
  • Such an antenna includes a patch which is typically constituted by etching of a metallic layer. It is called in English by "microstrip patch antenna” specialists for “pellet type antenna microstrip ".
  • the microstrip technique is a planar technique that applies to the both for the realization of lines transmitting signals and that of antennas realizing a coupling between such lines and radiated waves.
  • She uses conductive tapes and / or pads formed on the upper surface of a thin dielectric substrate.
  • a conductive layer extends over the surface bottom of this substrate and constitutes a mass of the line or the antenna.
  • Such a patch is typically wider than such a ribbon and its shapes and dimensions are important features of the antenna.
  • the form of the substrate is typically that of a flat rectangular sheet of thickness constant and the patch is also typically rectangular. But one varying the thickness of the substrate can widen the bandwidth of such antenna and its patch can take various forms and for example be circular.
  • the electric field lines extend between the ribbon or the pellet and the mass layer crossing the substrate.
  • the antennas produced according to these techniques typically constitute, although not necessarily, resonant structures capable of being the seat standing waves allowing coupling with radiated waves in space.
  • each such resonance can be described as a standing wave formed by the superposition of two progressive waves propagating in two opposite directions on the same path, these two waves resulting from the alternative reflection of the same wave progressive electromagnetic at both ends of this path.
  • this last wave propagates in an electromagnetic line which would be constituted by the mass, the substrate and the patch and which would define a linear path devoid of width.
  • a such wave has wave surfaces which extend transversely across the entire section offered to them by the antenna so this description simplifies the reality in a sometimes excessive way.
  • this path can be straight or curved. He will be hereinafter referred to as the "resonance path”.
  • the frequency of resonance is inversely proportional to the time taken by the traveling wave considered above to travel this route.
  • a first type of resonance can be called “half wave”.
  • the length of the resonance path is typically substantially equal to one half wavelength i.e. half the wavelength of the wave progressive considered above.
  • the antenna is then called “half-wave”.
  • This guy of resonance can be defined generally by the presence of a electric current node at each of the two ends of such a path including the length can therefore also be equal to said half-wavelength multiplied by an integer other than one. This number is typically odd.
  • the coupling with the radiated waves takes place at at least one of the two ends of this path, these ends being located in regions where the amplitude of the electric field prevailing in the substrate is maximum.
  • a second type of resonance which can be obtained within the framework of this same technique can be called "quarter wave". It differs from said half-wave type on the one hand by the fact that the resonance path typically has a length substantially equal to a quarter wave, i.e. a quarter of the wavelength defined above.
  • the resonant structure must have a short circuit at one end of this path, the word short circuit designating a connection connecting the ground and the patch.
  • this short circuit must have an impedance small enough to be able to impose such resonance.
  • This type of resonance can be generally defined by the presence of an electric field node fixed by such a short circuit to the near an edge of the patch and by an electric current node located the other end of the resonance path.
  • the length of the latter can therefore also be equal to a whole number of half-wavelengths added to said quarter wavelength.
  • the coupling with the radiated waves in the space is made on an edge of the patch in a region where the amplitude of the electric field through the substrate is large enough.
  • Resonances of other more or less complex types can be established in antennas of this kind, each resonance being characterized by a distribution of electric and magnetic fields which oscillate in an area of space including the antenna and its immediate vicinity. They depend in particular on the configuration of the pellets, the latter possibly in particular present slots, possibly radiative. They depend also of the possible presence and location of short circuits as well as electrical models representative of these short circuits when these are imperfect short circuits, i.e. when they are not similar, even approximately, to perfect short-circuits whose impedances would be zero.
  • the present invention finds application in various types of devices such as portable radios, base stations for mobile phones, automobiles and airplanes or air missiles.
  • portable radiotelephone the continuous nature of the lower mass layer of an antenna produced using the microstrip technique limits the power of radiation which is intercepted by the body of the user of the device when the latter is operating in transmission.
  • the antenna can be conformed to this profile so as not to bring up annoying additional aerodynamic drag.
  • a first such known antenna is described in the patent document US-A 4,766,440 (Gegan).
  • the patch 10 of this antenna has a shape general rectangular allowing this antenna to present two half wave resonances whose paths are established along a length and a width of this patch. Furthermore it has a curved slit in the shape of U which is entirely internal to this patch. This slit is radiative and brings up an additional mode of resonance established according to a other route. It also allows, by a suitable choice of its shape and its dimensions, to bring the frequencies of the resonance modes to desired values which gives the possibility of emitting a polarized wave circular thanks to the association of two modes having the same frequency and linear polarizations crossed and phase shifted by 90 °.
  • the device coupling has the form of a line which is produced according to the technique of microstrips but which is also said to be coplanar, this because the microstrip extends in the plane of the patch and enters between two notches of the latter.
  • This device is provided with transformation means impedance to adapt it to the different input impedances respectively presented by the line at the different resonance frequencies used as working frequencies.
  • the tablet of this antenna has the shape of a circular disc 10 allowing this antenna to present two half wave resonances.
  • the coupling system presents the form of a line 16 constituting a quarter wave transformer and is connecting at an interior point to the area of the patch so as to give the real part of the antenna input impedance values substantially equal for these two resonances.
  • Line 16 is made using the technique microstrips.
  • Two slits are formed in the conductive layer of this pastille and enter the area thereof from its periphery to delimit between them the ribbon of a terminal segment of this line.
  • One of these two slits is continued by an extension which constitutes a slit impedance matching 28.
  • a third known dual-frequency antenna differs from the previous ones by the use of a quarter wave resonance. It is described in an article: IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM DIGEST, NEWPORT BEACH, JUNE 18-23, 1995, pages 2124-2127 Boag et al "Dual Band Cavity-Backed Quarter-wave Patch Antenna".
  • a first resonant frequency is defined by the dimensions and characteristics of the substrate and the patch of this antenna.
  • a resonance substantially the same type is obtained at a second frequency on the same resonance path thanks to the use of an adaptation system.
  • a flat reactive element may, however, have another shape for perform a coupling according to this invention. It can for example be constituted by an interdigitated capacity integrated in the layout of the separating slot thanks to an adequate cutting of the edges opposite the two areas of the pellet.
  • this antenna also includes a short circuit connecting electrically the first conductive ground to earth in the vicinity of the origin of the separating slit.
  • the area of the capacitor is between 1% and 25% of that of the pastille.
  • the origin of the separating slit is close to the short circuit so as to give the two resonances two resonance paths respective both extending from this short circuit, one of these two paths extending only in the first range and the other extending in this first range and in the second range.
  • FIG. 1 represents a perspective view of a device for transmission made according to this invention.
  • FIG. 2 represents a top view of an antenna produced according to this invention and analogous to that of the device of FIG. 1.
  • FIG. 3 represents a partial view in vertical section of the antenna of Figure 2.
  • Figure 4 reproduces the view of Figure 2 to designate different dimensions of the same antenna.
  • the antenna further includes a coupling system.
  • This system has the form of a microstrip line.
  • This line includes on the one hand a main conductor consisting of a C1 coupling strip extending over the upper surface of the substrate.
  • This ribbon is connected to the patch 6 at a point connection 18 which can for example be located on the first lateral edge 14. The distance from the rear edge 10 to this point constitutes a dimension of connection L4.
  • This line also has a ground conductor constituted by layer 4. In FIG. 1, it is only to simplify the drawing that the substrate 2 is not represented under the ribbon C1 and that this line is shown with a very small length.
  • connection set typically comprises a connection line which is external to the antenna.
  • This line can in particular be of the coaxial type, of the microstrip type or of the coplanar type.
  • Figure 1 it has been symbolically represented under the form of two conductive wires C2 and C3 respectively connecting the ground 4 and the ribbon C1 at the two terminals of the signal processing member T. But it must be understood that this line would in practice be preferably carried out under the shape of a microstrip line or a coaxial line.
  • the signal processor T is adapted to operate at predetermined working frequencies which are at least close to frequencies useful of the antenna, i.e. which are included in bandwidths centered on such useful frequencies, these frequencies being those of certain at least antenna resonance modes. It can be composite and then have an element permanently tuned to each of these working frequencies. It can also include a tunable element on the various working frequencies.
  • a separating slit 17 enters the area of the patch 6 from a origin 40 separating two segments 10 and 11 from the rear edge thereof. extends to a bottom 15 located at a distance from the lateral edges 14 and 16 and from the front edge 12. It partially separates from each other a first and a second ranges 31 and 33 which are connected beyond this bottom by a passage 32. It comprises for example three straight segments of length neighbors, a first segment extending from the origin 40 towards the edge front 12 approaching the second lateral edge 16, a second segment extending parallel to this front edge towards this lateral edge, and a third segment extending parallel to this first segment up to background 15. The distances from this background to these two edges are respectively less than half the length and width of the patch. A width of this slit is defined at each point of its length. She is by example, although not necessarily, uniform.
  • This slot reveals two modes of resonance constituting respectively a primary resonance having a frequency of primary resonance and a secondary resonance having a frequency of secondary resonance.
  • the primary resonance extends over the entire patch 6. It is approximately of the quarter wave type, its path of resonance extending from short circuit S to segment 11 of the rear edge. His coupling with radiated waves is mainly done from this segment and the adjacent part of the second lateral edge 16.
  • the resonance secondary extends only on the range 31. It is also approximately quarter-wave type, its resonance path extending from short circuit S to front edge 12. Its coupling with radiated waves is mainly done from this edge and from the adjacent part of the first lateral edge 14.
  • the first area 31 can have a protrusion 34 extending in the plane of the patch 6, projection on the first lateral edge 14, in the vicinity of the front edge 12. It has Indeed, it was found that such a projection could facilitate the adjustment of the resonant frequencies of the antenna.
  • the area of this capacitor is for example rectangular and close to 5% of that of this pastille. It preferably extends to contact or immediate vicinity of the periphery of this patch.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Waveguide Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Transmitters (AREA)
EP01403150.4A 2001-01-05 2001-12-06 Dualband Planarantenne und diese enthaltendes Gerät Expired - Lifetime EP1225655B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0100139 2001-01-05
FR0100139A FR2819346B1 (fr) 2001-01-05 2001-01-05 Antenne planaire et dispositif de transmission bi-bande incluant cette antenne

Publications (2)

Publication Number Publication Date
EP1225655A1 true EP1225655A1 (de) 2002-07-24
EP1225655B1 EP1225655B1 (de) 2016-03-30

Family

ID=8858556

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01403150.4A Expired - Lifetime EP1225655B1 (de) 2001-01-05 2001-12-06 Dualband Planarantenne und diese enthaltendes Gerät

Country Status (5)

Country Link
US (1) US6606062B2 (de)
EP (1) EP1225655B1 (de)
JP (1) JP4249411B2 (de)
CN (1) CN100433451C (de)
FR (1) FR2819346B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6621455B2 (en) 2001-12-18 2003-09-16 Nokia Corp. Multiband antenna

Families Citing this family (16)

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WO2003034544A1 (en) * 2001-10-16 2003-04-24 Fractus, S.A. Multiband antenna
TW512558B (en) * 2002-01-16 2002-12-01 Accton Technology Corp Surface-mountable dual-band monopole antenna for WLAN application
BR0215790A (pt) * 2002-06-25 2005-03-01 Fractus Sa Antena para múltiplas faixas de sintonia
TW572384U (en) * 2002-07-03 2004-01-11 Tatung Co Printed circuit board antenna capable of receiving signals of different polarized directions
US7012570B2 (en) * 2003-05-15 2006-03-14 Mediatek Incorporation Antenna with printed compensating capacitor
US7233296B2 (en) * 2005-08-19 2007-06-19 Gm Global Technology Operations, Inc. Transparent thin film antenna
US7289073B2 (en) * 2005-08-19 2007-10-30 Gm Global Technology Operations, Inc. Method for improving the efficiency of transparent thin film antennas and antennas made by such method
CN101005291B (zh) * 2007-01-19 2010-05-19 清华大学 移动终端双频平面两天线系统
US8138985B2 (en) * 2008-04-05 2012-03-20 Henry Cooper Device and method for modular antenna formation and configuration
FI20096320A0 (fi) * 2009-12-14 2009-12-14 Pulse Finland Oy Monikaistainen antennirakenne
KR20120099861A (ko) * 2011-03-02 2012-09-12 한국전자통신연구원 평면형 메타물질을 포함한 마이크로스트립 패치 안테나 및 그 동작 방법
CN103474778B (zh) * 2013-09-13 2015-09-09 电子科技大学 一种双频率接收天线及双频率整流天线
WO2016187886A1 (zh) * 2015-05-28 2016-12-01 华为技术有限公司 缝隙天线及电子设备
JP6668197B2 (ja) * 2016-08-18 2020-03-18 株式会社東芝 無線装置
US10193597B1 (en) * 2018-02-20 2019-01-29 Apple Inc. Electronic device having slots for handling near-field communications and non-near-field communications
CN112909522B (zh) * 2021-01-15 2022-06-21 西安电子科技大学 一种奇偶模融合的小型化宽带窄缝天线

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US4972196A (en) * 1987-09-15 1990-11-20 Board Of Trustees Of The Univ. Of Illinois Broadband, unidirectional patch antenna
WO1997002623A1 (en) * 1995-07-05 1997-01-23 California Institute Of Technology A dual polarized, heat spreading rectenna
EP0961344A1 (de) * 1998-05-28 1999-12-01 Alcatel Funkkommunikationseinrichtung und eine Schlitz-Schleifenantenne
US6002367A (en) * 1996-05-17 1999-12-14 Allgon Ab Planar antenna device

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US4684952A (en) * 1982-09-24 1987-08-04 Ball Corporation Microstrip reflectarray for satellite communication and radar cross-section enhancement or reduction
US5617103A (en) * 1995-07-19 1997-04-01 The United States Of America As Represented By The Secretary Of The Army Ferroelectric phase shifting antenna array
US5926139A (en) * 1997-07-02 1999-07-20 Lucent Technologies Inc. Planar dual frequency band antenna
US6097345A (en) * 1998-11-03 2000-08-01 The Ohio State University Dual band antenna for vehicles
US6466170B2 (en) * 2001-03-28 2002-10-15 Motorola, Inc. Internal multi-band antennas for mobile communications
US6421018B1 (en) * 2001-05-31 2002-07-16 Andrew Corporation Bowtie inductive coupler

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4972196A (en) * 1987-09-15 1990-11-20 Board Of Trustees Of The Univ. Of Illinois Broadband, unidirectional patch antenna
WO1997002623A1 (en) * 1995-07-05 1997-01-23 California Institute Of Technology A dual polarized, heat spreading rectenna
US6002367A (en) * 1996-05-17 1999-12-14 Allgon Ab Planar antenna device
EP0961344A1 (de) * 1998-05-28 1999-12-01 Alcatel Funkkommunikationseinrichtung und eine Schlitz-Schleifenantenne

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6621455B2 (en) 2001-12-18 2003-09-16 Nokia Corp. Multiband antenna

Also Published As

Publication number Publication date
US20020196191A1 (en) 2002-12-26
EP1225655B1 (de) 2016-03-30
CN100433451C (zh) 2008-11-12
FR2819346B1 (fr) 2004-06-18
JP4249411B2 (ja) 2009-04-02
FR2819346A1 (fr) 2002-07-12
US6606062B2 (en) 2003-08-12
JP2002271132A (ja) 2002-09-20
CN1363968A (zh) 2002-08-14

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