WO2001020714A1 - Antenne plane large bande ou multibande - Google Patents

Antenne plane large bande ou multibande Download PDF

Info

Publication number
WO2001020714A1
WO2001020714A1 PCT/IL2000/000551 IL0000551W WO0120714A1 WO 2001020714 A1 WO2001020714 A1 WO 2001020714A1 IL 0000551 W IL0000551 W IL 0000551W WO 0120714 A1 WO0120714 A1 WO 0120714A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
plate
slot
electrical
resonant frequencies
Prior art date
Application number
PCT/IL2000/000551
Other languages
English (en)
Inventor
Leslie J. Reading
Donald E. T. Wingo
Original Assignee
Galtronics Ltd.
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 Galtronics Ltd. filed Critical Galtronics Ltd.
Priority to AU68635/00A priority Critical patent/AU6863500A/en
Publication of WO2001020714A1 publication Critical patent/WO2001020714A1/fr

Links

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
    • H01Q9/0442—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
    • 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
    • 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
    • H01Q5/371—Branching 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
    • H01Q9/0421—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

Definitions

  • the present invention relates generally to antennas, and specifically to compact, internal antennas for use in mobile communication devices.
  • Fig. 1 is a schematic, isometric drawing of an inverted-F antenna 20, as is known in the art.
  • the antenna comprises a planar conductive element 22, which is coupled to a paral3.el ground plane 24 by a short-circuit plate 26.
  • a transmission line 28 is fed through the ground plane to receive signals from the planar element.
  • the dimensions of element 22, marked LI and L2, must be one quarter wave at the design wavelength of the antenna.
  • the inverted-F antenna an inherently narrow bandwidth.
  • the bandwidth of the antenna increases with the height H of element 22 above ground plane 24.
  • Dielectric loading In order to fit antenna 20 inside a cellular telephone, operating in a range between 800 and 1000 MHz, it is necessary to use dielectric loading between element 22 and ground plane 24 so as to reduce the quarter wave dimensions. Dielectric loading, however, reduces the bandwidth of the antenna structure still further.
  • the size constraints of the telephone case also limit the available height H.
  • the dimensions of antenna 20 must be on the order of 35 x 25 x 7 mm, and the antenna must operate in a range between 800 and 1000 MHz, with a bandwidth of at least 80-100 MHz.
  • a slot is formed in the receiving plate of an inverted F antenna, thus dividing the plate into two or more electrical elements.
  • Each of the elements defines a separate electrical path in the antenna, with its own resonant frequency.
  • the resonant frequencies are closely spaced, so that the response curves of the elements overlap in order to provide a broad response band.
  • the resonant frequencies are spaced O 01/20714
  • slot and the two elements are designed to provide frequency and bandwidth characteristics that moot the requirements of cellular or other mobile communication systems, without exceeding size constraints of mobile communication devices.
  • a planar antenna including first and second conductive plates, which are disposed approximately parallel to one another and are electrically coupled one to the other, the first plate including first and second electrical elements separated by a slot therebetween, the slot having first and second linear portions, such that the first linear portion is disposed between the first and second electrical elements, and the second linear portion is substantially perpendicular to and intersects with the first linear portion.
  • the antenna includes a conductive strap that electrically couples the first plate to the second plate, wherein the slot and strap are placed so as to define first and second electrical paths in the antenna, from the first and second electrical elements, respectively, to the strap.
  • the first and second electrical elements have respective, different first and second resonant frequencies.
  • the first and second electric elements have respective first and second resonance bands around the respective resonant requencies, and wherein the first and second resonant frequencies are mutually spaced so as to create a partial overlap between the first and second resonance bands, whereby the antenna functions as a broadband antenna.
  • the first and second electric elements have respective first and second resonance bands around O 01/20714
  • the antenna functions as a multi-band antenna.
  • the antenna includes a capacitive element, which capacitively couples the first electrical element to the second electrical element.
  • one or more additional slots are formed m the first plate, in addition to the slot separating the first and second electrical elements.
  • a method of forming a planar antenna including: providing a first conductive plate with a slot therein that separates the first plate into first and second electrical elements, the slot having first and second linear portions, such that the first linear portion is disposed between the first and second electrical elements, and the second linear portion is substantially perpendicular to and intersects with the first linear portion; and positioning the first conductive plate approximately parallel to a second conductive plate so as to generate a resonant response to electromagnetic radiation at one or more desired frequencies.
  • Fig. 1 is a schematic, isometric drawing of a planar antenna, as is known in the art; O 01/20714
  • Fig. 2 is a schematic, isometric drawing of a broadband planar antenna, in accordance with a preferred embodiment of the present invention
  • Fig. 3 is a plot showing a frequency response curve of the antenna of Fig. 2;
  • Fig. 4 is a schematic top view of the antenna of Fig. 2 with the addition of a dielectric coupling element, in accordance with a preferred embodiment of the present invention
  • Fig. 5 is a schematic top view of a broadband planar antenna, in accordance with another preferred embodiment of the present invention.
  • Fig. 6 is a schematic top view of a dual-band planar antenna, in accordance with a preferred embodiment of the present invention.
  • FIG. 2 is a schematic, isometric drawing of a broadband planar antenna 30, in accordance with a preferred embodiment of the present invention.
  • Antenna 30 comprises a top (receiving) plate 32 and an approximately parallel bottom (ground) plate 40, separated by a non-conductive medium. The two plates are connected together at a single point by a conductive strap 42.
  • the transmission line feed-through to plate 32, as shown in Fig. 1, is omitted from this and subsequent figures for the sake of simplicity.
  • the medium between the plates comprises a dielectric material, such as Dolrin (not shown in the figures) .
  • the bandwidth of antenna 30 is increased, relative to the conventional design of Fig. 1, by introducing a
  • T-shapod slot 38 in plate 32 so as to create a multiple resonance condition.
  • Slot 38 divides plate 32 into two electrical elements 34 and 3 ⁇ , having different O 01/20714
  • Each of elements 34 and 36 therefore has its own, different resonant frequency.
  • slot 38 is designed so that the two resonant frequencies are closely spaced, with the resonant bands overlapping in order to create a broad resonant response.
  • the center placement of strap 42 which is the basic radiating element, ensures that the resonant lengths are closely spaced.
  • the lengths of elements 34 and 36 can be trimmed to further aid in achieving the desired frequencies and overlap condition.
  • Slot 38 also servos to lower the resonant frequency of the antenna.
  • Fig. 3 is a plot that schematically illustrates the frequency response of antenna 30, This plot was generated using plates 32 and 40 with dimensions 35 x 25 mm, with an overall height between the plates of 5 mm. ⁇ s shown in the figure, the antenna has a center frequency of 965.6 MHz and a bandwidth (at -10 dB) of 90.2 MHz. The dual, overlapping response curves of elements 34 and 36 can be seen in the "W" shape of the plot in Fig. 3. Similar results were obtained at other frequencies in the 800-1000 MHz range by varying the dimensions and spacing of plates 32 and 40. These dimensions and specific frequency data are given here by way of example, and the principles of the present invention may be applied to produce antennas of other dimensions, for use in other frequency ranges.
  • the width of slot 38 serves as a coupling mechanism between the two resonant structures of elements 34 and 36. This coupling controls the depth of resonance of the response curves, as well as the spacing between the resonant points.
  • the width of the slot controls the amount of coupling, and therefore care must be exercised in establishing the slot width. An under-coupled condition will cause the two resonant points to be widely
  • Fig. 4 is a schematic top view of antenna 30, wherein a capacitive coupling element 44 is placed across slot 38, in accordance with a preferred embodiment of the present invention. Only top plate 32 is seen in this view.
  • coupling element 44 was made from a single-sided printed circuit board positioned over slot 38, with no electrical contact between the coupling element and the antenna. The amount of coupling is controlled by the size of the element and its position along the slot. Preferably, m actual production, coupling element 44 is contained within a layer of plastic either above or below the slot.
  • electrical elements 34 and 36 are coupled by a discrete capacitor instead of element 44.
  • Fig. 5 is a schematic top view of another broadband, planar antenna 50, in accordance with a preferred embodiment of the present invention.
  • an upper plate 52 of antenna 50 is divided into electrical elements 56 and 58 by a "T" slot 60. (Here, too, the lower plate is not shown.)
  • Two additional slots 62 and 64 are added to further lower the frequency of the antenna by increasing the path lengths through elements 56 and 58 to strap 42. Thus, the overall size of the antenna, relative to the design frequency, is reduced.
  • top and bottom plates need not be square or rectangular as shown in the igures.
  • the ground plane (bottom plate 40) does not have to be the same size as the top plate.
  • the top plate may also be folded to increase electrical length without sacrificing broadband performance.
  • top and bottom are used herein for convenience in identifying the antenna plates, which may in actual practice be placed in substantially any orientation.
  • Fig. 6 is a schematic top view of a dual-band antenna 70, in accordance with a preferred embodiment of the present invention.
  • a cross-slot 78 is formed in a top plate 72 of the antenna. (The bottom plate is not shown.) The cross-slot presents more than two electrical paths to strap 42, so that multiple resonances are created.
  • This design was found to give dual-band performance while maintaining a broad bandwidth at the lower frequency.
  • Such a design can be used to produce a single structure that covers two or more non-harmonic related frequency bands, such as the GSM (950 MHz) and DCS (1.8 GHz) bands.
  • two independent planar antennas having different frequency bands, are mounted on the same dielectric spacer.
  • the antennas are preferably of the slotted-T type shown in Fig. 2, so that each antenna has a broadband response at its respective frequency. It has been found that the coupling between the antennas is low. Two feeds are required in this n ⁇ nn A O 01/20714

Landscapes

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

Abstract

La présente invention concerne une antenne plate (30) constitué de deux plans électro-conducteurs (32, 40) sensiblement parallèles et électriquement couplés entre eux. Le premier plan comprend deux éléments électriques (34, 36) séparés l'un de l'autre par une fente (38). Cette fente se distingue par deux parties linéaires dont la première est située entre les deux éléments électriques et dont la seconde coupe la première sensiblement à angle droit.
PCT/IL2000/000551 1999-09-10 2000-09-08 Antenne plane large bande ou multibande WO2001020714A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU68635/00A AU6863500A (en) 1999-09-10 2000-09-08 Broadband or multi-band planar antenna

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US15317999P 1999-09-10 1999-09-10
US60/153,179 1999-09-10

Publications (1)

Publication Number Publication Date
WO2001020714A1 true WO2001020714A1 (fr) 2001-03-22

Family

ID=22546116

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IL2000/000551 WO2001020714A1 (fr) 1999-09-10 2000-09-08 Antenne plane large bande ou multibande

Country Status (2)

Country Link
AU (1) AU6863500A (fr)
WO (1) WO2001020714A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10206426A1 (de) * 2001-05-04 2002-11-07 Acer Comm & Multimedia Inc Dualfrequenzbandantenne mit gefalteter Struktur und entsprechendes Verfahren
EP1560287A1 (fr) * 2004-02-02 2005-08-03 High Tech Computer Corp. Antenne multifréquence
US7057561B2 (en) 2003-07-15 2006-06-06 High Tech Computer Corp. Multi-frequency antenna
US7339531B2 (en) 2001-06-26 2008-03-04 Ethertronics, Inc. Multi frequency magnetic dipole antenna structures and method of reusing the volume of an antenna
CN100433454C (zh) * 2001-06-26 2008-11-12 艾斯特里克有限公司 多频率磁性偶极子天线结构
US8738103B2 (en) 2006-07-18 2014-05-27 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US8941541B2 (en) 1999-09-20 2015-01-27 Fractus, S.A. Multilevel antennae
US9331382B2 (en) 2000-01-19 2016-05-03 Fractus, S.A. Space-filling miniature antennas

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5898404A (en) * 1995-12-22 1999-04-27 Industrial Technology Research Institute Non-coplanar resonant element printed circuit board antenna
US5940041A (en) * 1993-03-29 1999-08-17 Seiko Epson Corporation Slot antenna device and wireless apparatus employing the antenna device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5940041A (en) * 1993-03-29 1999-08-17 Seiko Epson Corporation Slot antenna device and wireless apparatus employing the antenna device
US5898404A (en) * 1995-12-22 1999-04-27 Industrial Technology Research Institute Non-coplanar resonant element printed circuit board antenna

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9054421B2 (en) 1999-09-20 2015-06-09 Fractus, S.A. Multilevel antennae
US8976069B2 (en) 1999-09-20 2015-03-10 Fractus, S.A. Multilevel antennae
US9761934B2 (en) 1999-09-20 2017-09-12 Fractus, S.A. Multilevel antennae
US9362617B2 (en) 1999-09-20 2016-06-07 Fractus, S.A. Multilevel antennae
US9240632B2 (en) 1999-09-20 2016-01-19 Fractus, S.A. Multilevel antennae
US9000985B2 (en) 1999-09-20 2015-04-07 Fractus, S.A. Multilevel antennae
US8941541B2 (en) 1999-09-20 2015-01-27 Fractus, S.A. Multilevel antennae
US10056682B2 (en) 1999-09-20 2018-08-21 Fractus, S.A. Multilevel antennae
US9331382B2 (en) 2000-01-19 2016-05-03 Fractus, S.A. Space-filling miniature antennas
US10355346B2 (en) 2000-01-19 2019-07-16 Fractus, S.A. Space-filling miniature antennas
DE10206426A1 (de) * 2001-05-04 2002-11-07 Acer Comm & Multimedia Inc Dualfrequenzbandantenne mit gefalteter Struktur und entsprechendes Verfahren
CN100433454C (zh) * 2001-06-26 2008-11-12 艾斯特里克有限公司 多频率磁性偶极子天线结构
US7339531B2 (en) 2001-06-26 2008-03-04 Ethertronics, Inc. Multi frequency magnetic dipole antenna structures and method of reusing the volume of an antenna
US7057561B2 (en) 2003-07-15 2006-06-06 High Tech Computer Corp. Multi-frequency antenna
EP1560287A1 (fr) * 2004-02-02 2005-08-03 High Tech Computer Corp. Antenne multifréquence
US9099773B2 (en) 2006-07-18 2015-08-04 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US9899727B2 (en) 2006-07-18 2018-02-20 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US8738103B2 (en) 2006-07-18 2014-05-27 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US10644380B2 (en) 2006-07-18 2020-05-05 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US11031677B2 (en) 2006-07-18 2021-06-08 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US11349200B2 (en) 2006-07-18 2022-05-31 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US11735810B2 (en) 2006-07-18 2023-08-22 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices

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Publication number Publication date
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