EP1203495A1 - Dispositif d'antenne a double bande - Google Patents

Dispositif d'antenne a double bande

Info

Publication number
EP1203495A1
EP1203495A1 EP00952107A EP00952107A EP1203495A1 EP 1203495 A1 EP1203495 A1 EP 1203495A1 EP 00952107 A EP00952107 A EP 00952107A EP 00952107 A EP00952107 A EP 00952107A EP 1203495 A1 EP1203495 A1 EP 1203495A1
Authority
EP
European Patent Office
Prior art keywords
radiating element
radiating
antenna device
antenna
elements
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.)
Withdrawn
Application number
EP00952107A
Other languages
German (de)
English (en)
Inventor
Jonas Gamalielsson
Annika Yidong Hu
Iréne LARSSON
Olov Edvardsson
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.)
Allgon AB
Original Assignee
Allgon AB
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 Allgon AB filed Critical Allgon AB
Publication of EP1203495A1 publication Critical patent/EP1203495A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H01Q1/244—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 extendable from a housing along a given path
    • 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
    • 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
    • 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
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/40—Radiating elements coated with or embedded in protective material
    • 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
    • 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
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/32—Vertical arrangement of 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
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Definitions

  • the invention relates to an antenna device, for transmitting and/or receiving RF signals within each of first and second frequency bands, which includes an extendable radiating structure.
  • a dual band antenna device for a mobile radio communication device e.g., a hand- portable telephone, which is capable of both transmitting and receiving on two separate frequency bands .
  • a mobile radio communication device e.g., a hand- portable telephone
  • This increases the probability of the telephone being operable for communication in a site where service is available within more than one band.
  • Such a telephone may be a terminal in, e.g., a GSM, PCN, DECT, AMPS, PCS, -CDMA, Korean PCS or PDC cellular telephone system, possibly having an additional pager function or other radio facilities.
  • antenna means including a helical element in combination with an extendable whip antenna have been used for hand-portable cellular telephones in order to achieve compact dimensions and durability while maintaining high efficiency in call mode.
  • One feature of a resonant antenna in general is that it is operable within one fundamental frequency band and within higher frequency bands, but only those having a fixed and predetermined relation to the fundamental frequency band.
  • the ranges of higher frequency bands depend on, inter alia, antenna geometry. An inherent, higher frequency band may not appear where desired for a given geometry of a radiator.
  • the telephone may preferably function in different operating modes. Two different operating modes are a stand-by mode and a call (talk) mode. In these two operating modes there are different demands upon the antenna means. For example, if the telephone is carried in the stand-by mode, the carrier (a person) may require a small-size and compact configuration of the telephone . An antenna means extending too far from the telephone may be inconvenient in this case.
  • an antenna means depends not only on the antenna means itself, but also on a radiation path between the telephone and a base station. Obstacles in the radiation path will lower the communication performance of the antenna. In personal telephones it is important that the body of the user does not excessively obstruct the radiation path. Therefore, an antenna means extending sufficiently far from the housing of the telephone is desirable in the call mode when demands for performance are higher. Also, antennas extending at least about a quarter wavelength from the telephone tend to be generally more efficient.
  • Dual band antennas having a helical or meander standby antenna with two radiating elements, through which a rod antenna is slidably arranged, have been provided.
  • the rod antenna comprises a straight radiator operating as a half wavelength antenna in the higher frequency band and as a quarter wavelength antenna in the lower frequency band. This requires that the relation between the frequency bands is approximately 1:2. Further, the tuning of the rod antenna for the two bands can have a complicated relation.
  • the matching of the rod antenna can also be somewhat complicated since different antenna types are to be matched, i.e. combinations of retracted/extended rod in talk position/free space.
  • WO-A1-97/49141 and WO-A1-97/30489 are examples of patent applications where such antenna applications are included.
  • WO, Al, 99/26314 and WO, Al, 99/26315 each discloses a dual band antenna including a rod antenna, which comprises two antenna elements, operating in a first and a second frequency band, respectively.
  • rod antennas are relatively long, since the radiating portions of the respective antenna elements and a coupling region are located after each other along the length of the rod. Also the manufacture of the antenna appears to be complicated due to the use of different layers and a spacer.
  • Multi band rod antennas are also known, where two straight radiators are located after each other along the length of the rod, and the radiators being connected via a resonance circuit, whereby one radiator operates in the higher frequency band and both radiators operate in the lower frequency band.
  • Such antennas are disclosed in EP, A2 , 0 896 384 and EP, A2 , 0 814 536. Since the two straight radiators and the resonance circuit are located after each other along the length of the rod, those rod antennas are relatively long. In the rod antennas above, having radiating elements and possibly components located in a row after each other, there will be a big difference in bending properties along the length of the rod. This can be a special problem if it occurs in a center portion of the rod where the moment arm is at maximum, and it could break due to indications of fracture. The tuning of such antennas appears to be quite complicated when two radiating elements coupled in series shall be tuned for two frequencies .
  • rod antennas including more than one radiating element are known from for example US, A, 3 550 145, US, A, 3 541 567, and WO, Al, 97/12417. All those antennas are designed as broad band antennas. Further, they are neither extendable/retractable nor arranged to be used in an antenna device including a further radiating structure.
  • rod antennas including more than one radiating element are known from for example US, A, 4 138 681, and US, A, 5 907 307. These antennas are designed as single band antennas. Further, neither are any provisions made for designing these to be extendable/retractable nor are they arranged to be used in an antenna device including a further radiating structure.
  • an antenna means of the kind mentioned above in which the radiating elements of the extendable and retractable radiating structure can be tuned with more freedom, than in prior art antennas.
  • An antenna means having arbitrary separation between the frequency bands can also be obtained. Due to the extra freedom in tuning an antenna device which is simple to match is also obtained.
  • an antenna device which radiates from a radiator further away from a telephone then an antenna device having the second radiating element in the lower portion is obtained.
  • a further object of the invention is to provide a radio communication device including an antenna device having the mentioned features.
  • Fig. 1 shows one possible application of an antenna device according to the invention.
  • Fig. 2 shows the antenna device of figure 1 schematically and enlarged.
  • Fig. 3 shows schematically, in a longitudinal section, a first embodiment according to the invention of the first radiating structure of figure 1 and 2.
  • Fig. 4 shows schematically, in a longitudinal section, a second embodiment according to the invention of the first radiating structure of figure 1 and 2.
  • Fig. 5 shows schematically a third embodiment according to the invention of the first radiating structure of figure 1 and 2.
  • Fig. 6 shows schematically a fourth embodiment according to the invention of the first radiating structure of figure 1 and 2.
  • Figure 7 shows schematically an alternative feeding arrangement .
  • Figure 8 shows a cross section taken at VIII-VIII in figure 1.
  • a hand portable mobile telephone 1 is provided with an antenna device 3, according to the invention.
  • the antenna device includes an antenna whip 4, which is movable between an extended position and a retracted position, and includes a first radiating structure 41.
  • the figure shows the antenna device with the whip 4 in the extended position. In the retracted position the whip is contained in the housing 2 of the telephone and inside a dielectric essentially cylindrical carrier 6. Only the knob 44, which is a stopper for the retraction movement, is visible from the outside when the whip 4 is in the retracted position.
  • the carrier 6 is provided with an opening through which the whip is slidable. Further the carrier 6 is provided with a second radiating structure 5, which performs the major part of the antenna function when the whip is in its retracted position.
  • the second radiating structure shown can be omitted or have other locations, e.g. inside the telephone.
  • FIG 2 shows the antenna device 3 of figure 1 schematically and enlarged.
  • the whip 4 includes a radiating first structure 41 having a rod shape, and which will be explained further below. Further, the whip includes a portion 43 of insulating material, which portion preferably has a length corresponding to the height of the second radiating structure 5, so that the first radiating structure 41 is not surrounded by the radiating structure 5 when the whip is in its retracted position. The portion 43 can be omitted if the second radiating structure 5 has another shape or location not surrounding the whip 4 in retracted position.
  • the whip 4 is provided with a knob 44, as mentioned above, and at the bottom it is provided with a stopper 42.
  • the stopper 42 has a cross section larger than that of the whip.
  • the movement of the whip to its extended position is stopped when the stopper 42 comes in contact with a device (not shown) , provided with an opening allowing the portion 41 of the whip 4 to slide through, but not the stopper 42, and arranged in or on the carrier 6 or the housing 2.
  • the stopper 42 is made of a conductive material and is adapted to contact the feed point 71 via a contact member 72 when the whip antenna 4 is extended, as is shown in fig 2.
  • the feed point 71 is connected to transceiver circuits of the radio communication device.
  • the second radiating structure 5 comprises meandering radiating elements. From the feed point 71, two meandering elements are fed.
  • the second radiating structure 5 can comprise one or two helical radiators for operation in one or more frequency bands.
  • matching means can be provided on the carrier 6, and being coupled between the feed point 71 and the respective radiating structure.
  • a first embodiment of the first radiating structure 41 is schematically shown, in a longitudinal section, provided with a stopper in a side view.
  • Lower ends of a first radiating element 45 and a second radiating element 46 are fixed and connected, at the lower end of the radiating structure 41, to the stopper 42.
  • the two radiating elements 45, 46 are fed at the lower end via the stopper 42 and extend in parallel from the lower end towards the upper end of the radiating structure 41.
  • the second radiating element 46 is tuned to a second frequency and has a length being shorter than the first radiating element 45.
  • the two radiating elements can easily be tuned to their respective frequencies.
  • the first element 45 can e.g. be tuned for operation in the 900 MHz GSM band and the second for operation in the 1800 MHz GSM band.
  • the ratio between the lengths can thus be 2:1.
  • the first radiating element 45 and the second radiating element 46 are separated with a certain spacing, e.g. about 0.5 mm, by a dielectric 47. Further, the radiating elements 45, 46 are surrounded by a dielectric 47, with a smallest thickness being about e.g. 0.5 mm. Preferably one continuous dielectric body 47 separates and surrounds the two radiating elements 45, 46. With this arrangement, where one radiating element 45 extends along the full length of the radiating structure 41, which is a major portion of the length of the antenna whip 4, a mechanically favourable antenna device is also obtained.
  • a second embodiment of the first radiating structure 41 is schematically shown, in a longitudinal section, provided with a stopper in a side view. It differs from the embodiment of figure 2 in that the second radiating element 46 extends from the upper end of the radiating structure 41. Only the first radiating element 45 is fed via the stopper 42 at the lower end. The second radiating element 46 is fed capacitively/inductively at its lower end via the second radiating structure 5.
  • the second radiating structure 5, which can include a meander structure or a helical structure can then exhibit an enlarged portion of one radiating element at the coupling region for improving the coupling.
  • the second radiating element 46 can be fed via the first radiating element 45.
  • the two radiating elements 45 then couple to each other capacitively/inductively along the length of the first radiating element 45.
  • one continuous dielectric body 47 preferably separates and surrounds the two radiating elements 45, 46.
  • the radiating structure of this embodiment has the advantages concerning durability and tuning properties as in the previous embodiment .
  • a third embodiment of the first radiating structure 41 according to the invention is schematically shown in figure 5.
  • the dielectric material of the radiating structure 41 is only indicated with broken lines, for clarity.
  • the radiating structure 41 includes a central first radiating element 45 attached to, and fed via, the stopper 42.
  • a second radiating element 46' having the shape of a conductive cylinder is concentrically arranged around the first radiating element 45.
  • the two radiating elements 45, 46' both extend from the upper end of the radiating structure 41, and the second radiating element 46' has a shorter length than the first radiating element.
  • the second radiating element 46' is fed capacitively/inductively at its lower end via the second radiating structure 5.
  • the second radiating structure 5, which can include a meander structure or a helical structure can then exhibit an enlarged portion of one radiating element at the coupling region for improving the coupling.
  • the second radiating element 46' which has the shape of a conductive cylinder, is attached to, and fed via, the stopper 42. It thus coextends with the first radiating element 45 from the lower end.
  • the radiating structures of those embodiments have the advantages concerning durability and tuning properties as in the previous embodiments .
  • FIG 6 a fourth embodiment of the first radiating structure 41 according to the invention is schematically shown.
  • the dielectric material of the radiating structure 41 is only indicated with broken lines, for clarity.
  • the radiating structure 41 includes a central first radiating element 45 attached to and fed via the stopper 42.
  • a second radiating element 46'' having a helical shape is concentrically arranged around the first radiating element 45.
  • the second radiating element 46'' is attached to, and fed via, the stopper 42.
  • the two radiating elements 45, 46'' both extend from the lower end of the radiating structure 41, and are shown to have the same axial length. However those lengths could be different.
  • the helically configured second radiating element 46'' can be replaced with a meandering element .
  • the first radiating element 45 is suitable for operation in a lower frequency band, whereas the second radiating element 46, 46' is suitable for operation in a higher frequency band.
  • the situation is the opposite, and the first radiating element 45 is suitable for a higher frequency band.
  • a much shorter radiating structure 41 can be obtained, which requires smaller space when retracted into the radio communication device.
  • Figure 7 shows schematically a feeding arrangement, which is an alternative to the feeding via the stopper 42.
  • the radiating elements 51, 52 of the second radiating structure 5 are provided with contact members 53, 54.
  • Those contact members are arranged to contact feed portions of the first 45 and second 46 radiating element, respectively, for feeding via portions of the radiating elements 51, 52 and feed point 71.
  • the first 45 and second 46 radiating element can be made shorter, when tuned to the desired frequency.
  • the cross section of the radiating structure 41 can advantageously be circular, especially when the radiating structure 41 is symmetric.
  • the cross section is not circular, in order to guide the whip and prevent rotation around a longitudinal axis.
  • a guiding member of a corresponding cross section is then present in or on the carrier 6 or the housing 2.
  • Such cross section could have the shape of an oval, a triangle, a square, a rectangle, etc.
  • the bending properties of the whip 4 due to the unsymmetric radiating structure 41 can be adjusted.
  • the whip can be controlled so that it always takes the same position in extended position, in relation to the chassis 2.
  • the radiating elements always take the same position in relation to each other and the chassis 2, and the radiation pattern can be controlled. If the radiating elements 45, 46, 46', 46'' have separated feed portions, the respective feed portion can be guided into contact with the corresponding contact member or coupling portion.
  • FIG 8 a cross section taken at VIII-VIII in figure 1, illustrating a possible cross section of the second radiating structure, is shown. As seen the carrier 6 has been given a corresponding cross section.
  • both the first radiating element 45 and the second radiating element 46 radiate along their full lengths.
  • the first structure may include at least one further radiating element at least partially co-extending with the first radiating element 45.
  • the further radiating element (-s) can be a straight radiating element, a helical radiating element, a tubular radiating element or meandering radiating element.
  • the feeding can be provided by galvanic, inductive or capacitive coupling at a feed portion preferably located at one end of the further radiating element (-s) .

Landscapes

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

Abstract

L'invention concerne un dispositif d'antenne destiné à émettre et/ou recevoir des signaux RF dans deux bandes de fréquence, ainsi qu'un dispositif de radiocommunication comprenant ce dispositif d'antenne. Ledit dispositif d'antenne (3) comprend un dispositif d'alimentation (42, 71, 72, 53, 54) et un fouet (4) conçu pour glisser vers l'intérieur ou l'extérieur du téléphone, respectivement dans une position rétractée ou déployée. Ledit fouet comprend une structure rayonnante (41) constituée d'un premier élément rayonnant (45) et d'un second élément rayonnant (46, 46', 46'') réglés pour fonctionner dans une première et une seconde bande de fréquence. Le premier élément rayonnant (45) et le second élément rayonnant (46, 46', 46'') se suivent sur une section importante dudit second élément rayonnant (46, 46', 46''), le premier élément rayonnant (45) et le second élément rayonnant (46, 46', 46'') étant conçus pour rayonner le long de cette section.
EP00952107A 1999-08-11 2000-08-04 Dispositif d'antenne a double bande Withdrawn EP1203495A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9902877 1999-08-11
SE9902877A SE9902877L (sv) 1999-08-11 1999-08-11 Antennenhet för två band
PCT/SE2000/001542 WO2001011899A1 (fr) 1999-08-11 2000-08-04 Dispositif d'antenne a double bande

Publications (1)

Publication Number Publication Date
EP1203495A1 true EP1203495A1 (fr) 2002-05-08

Family

ID=20416650

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00952107A Withdrawn EP1203495A1 (fr) 1999-08-11 2000-08-04 Dispositif d'antenne a double bande

Country Status (6)

Country Link
EP (1) EP1203495A1 (fr)
KR (1) KR20020016934A (fr)
CN (1) CN1369176A (fr)
AU (1) AU6486500A (fr)
SE (1) SE9902877L (fr)
WO (1) WO2001011899A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003017929A (ja) * 2001-07-04 2003-01-17 Maspro Denkoh Corp 広帯域スリーブアンテナ
KR20040019781A (ko) * 2002-08-29 2004-03-06 (주) 코산아이엔티 다중대역용 이동통신 단말기의 안테나 조립구조
WO2005076409A1 (fr) 2004-01-30 2005-08-18 Fractus S.A. Antennes unipolaires multibandes pour dispositifs de communications fonctionnant sur un reseau mobile
GB2410837B (en) * 2004-02-06 2007-05-23 Harada Ind Co Ltd Multi-band antenna using parasitic element
CN101465465B (zh) * 2007-12-20 2013-04-03 智易科技股份有限公司 双频天线
CN102832443A (zh) * 2011-06-17 2012-12-19 云南银河之星科技有限公司 一种宽频电小天线

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3541567A (en) * 1967-09-25 1970-11-17 Richard J Francis Multielement radio-frequency antenna structure having linearly arranged elements
US4138681A (en) * 1977-08-29 1979-02-06 Motorola, Inc. Portable radio antenna
CA2139682A1 (fr) * 1995-01-05 1996-07-06 Paul Francis Bickert Dispositif de reduction du rayonnement pour appareil de radiocommunication portatif
SE509638C2 (sv) * 1996-06-15 1999-02-15 Allgon Ab Meanderantennanordning

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0111899A1 *

Also Published As

Publication number Publication date
CN1369176A (zh) 2002-09-11
AU6486500A (en) 2001-03-05
SE9902877L (sv) 2001-02-12
WO2001011899A1 (fr) 2001-02-15
KR20020016934A (ko) 2002-03-06
SE9902877D0 (sv) 1999-08-11

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