EP1956679A2 - Antenne multibande miniaturisée - Google Patents

Antenne multibande miniaturisée Download PDF

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Publication number
EP1956679A2
EP1956679A2 EP08002385A EP08002385A EP1956679A2 EP 1956679 A2 EP1956679 A2 EP 1956679A2 EP 08002385 A EP08002385 A EP 08002385A EP 08002385 A EP08002385 A EP 08002385A EP 1956679 A2 EP1956679 A2 EP 1956679A2
Authority
EP
European Patent Office
Prior art keywords
radiation portion
radiation
antenna
band antenna
section
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.)
Ceased
Application number
EP08002385A
Other languages
German (de)
English (en)
Other versions
EP1956679A3 (fr
Inventor
Yun-Ta Chen
Chien-Pang Chou
Chang-Hao Hsieh
Chia-I Lin
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.)
HTC Corp
Original Assignee
High Tech Computer Corp
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 High Tech Computer Corp filed Critical High Tech Computer Corp
Publication of EP1956679A2 publication Critical patent/EP1956679A2/fr
Publication of EP1956679A3 publication Critical patent/EP1956679A3/fr
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • 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
    • 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
    • H01Q9/30—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 present invention relates to a miniaturized multi-band antenna according to the pre-characterizing clause of claim 1.
  • An antenna is required to receive information carried by wireless electromagnetic waves in a wireless communications network. Therefore the development of antennas has also become one of key issues for vendors in the technology field. In order to have users implement and access information from different wireless networks in ease, an antenna with better design should be able to cover different bands of each wireless communications network with only one antenna. Besides, the size of the antenna should be as small as possible to be implemented in compact portable wireless devices (such as cellphones, Personal Digital Assistants i.e. PDAs).
  • the present invention aims at providing a miniaturized multi-band antenna for overcoming these problems.
  • the claimed multi-band antenna includes a third radiation portion installed above a first surface and coupled to a coupling portion, the third radiation portion having an intercoupling with a first radiation portion and a second radiation portion.
  • PIFAs Planar Inverted-F Antennas
  • Fig. 1 is a diagram of an antenna 10 that is a typical PIFA.
  • a PIFA generally uses a planar radiation portion and a planar base to induce an electromagnetic wave oscillation.
  • an antenna as shown in the R.O.C. patent publication number 200419843 (corresponding to U.S. patent US6,930,640 ) is also a type of PIFA.
  • a planar radiation portion of the antenna requires a large planar area, and a distance between the radiation plane and a base plane of the antenna d0 (as in Fig. 1 ) is related to a frequency/bandwidth of the antenna that cannot be adjusted as desired.
  • the antenna of the prior art cannot be structurally reduced in size and is unable to meet the needs of compactness and multi-band reception.
  • Fig. 2 is a view of a multi-band antenna 20 of the first embodiment according to the present invention.
  • Fig. 3 is a top view of the antenna 20 in Fig. 2 .
  • the antenna 20 comprises a coupling portion 22, a first radiation portion 24, a second radiation portion 26, and a third radiation portion 28.
  • the coupling portion 22 is installed on a printed circuit board 30 for feeding-in or feeding-out signals. Assume that the printed circuit board 30 is a first surface S1.
  • the first radiation portion 24 and the second radiation portion 26 are installed on a second surface S2 perpendicular to the first surface S1.
  • the first radiation portion 24 and the second radiation portion 26 are coupled to the coupling portion 22.
  • the first radiation portion 24 and the second radiation portion 26 comprise at least one section respectively, and one section of the first radiation portion 24 is parallel to one section of the second radiation portion 26 and has an intercoupling with the second radiation portion 26.
  • the third radiation portion 28 is installed on the printed circuit board 30 and coupled to the coupling portion 22.
  • the third radiation portion has an intercoupling with the first radiation portion 24 and the second radiation portion 26.
  • the first radiation portion 24 and the second radiation portion 26 of the antenna 20 uses a stamped metal with the width 1.0mm to form a radiation surface S2 installed vertically on the printed circuit board 30.
  • the second radiation portion 26 In low frequency bands, such as GSM (Global System for Mobile communication)-850/900 (824 ⁇ 960MHz), the second radiation portion 26 has a longer metal length so as to radiate electromagnetic waves in low frequency bands.
  • the first radiation portion 24 has a shorter metal length so as to radiate electromagnetic waves in high frequency bands.
  • the third radiation portion 28 installed on the printed circuit board 30 is an auxiliary antenna, which is coupled to the radiation surface S2 via the coupling portion 22.
  • the auxiliary antenna can radiate electromagnetic waves in higher frequency bands, such as WCDMA (Wide-band Code-Division Multiple Access) -2100 (1920 ⁇ 2170MHz). As shown in Fig.
  • the distance d1 between the third radiation portion 28 and the radiation surface S2 can be adjusted so that the third radiation portion 28 has an intercoupling with the radiation surface S2 to generate the required bandwidth.
  • the antenna 20 can provide a broad range of services including GSM-850/900, GSM-1800/1900, 3G, WCDMA-2100, UMTS (Universal Mobile Telecommunications System)-2100 (1940 ⁇ 2170MHz), and GPS.
  • Fig. 4 is a front view of the antenna 20 in Fig. 2 .
  • the first radiation portion 24 and the second radiation portion 26 are fixed with a fixture 32.
  • Fig. 4 shows the size of the first radiation portion 24 and the second radiation portion 26.
  • the unit is mm.
  • the fixture 32 can be a medium material (i.e. a non-conductive material such as plastic etc.).
  • the fixture 32 comprises various holes and rails to fit with the first radiation portion 24 and the second radiation portion 26.
  • the fixture 32, the first radiation portion 24, and the second radiation portion 26 are fixed together, the combination can be easily placed on the circuit board 30 because the fixture 32 can comprise tenons, screw holes etc. to have the combination fixed on the circuit board 30.
  • the fixture 32 not only fixes or protects the first radiation portion 24 and the second radiation portion 26, but also can be used as a supporting pole for other communications devices.
  • the material of the fixture 32 can affect the characteristics of the antenna 20.
  • the distance d1 between the third radiation portion 28 and the radiation surface S2 can be adjusted to fine-tune the characteristics and compensate effects of the fixture 32.
  • the characteristics or other radiation characteristics of the antenna 20 can also be adjusted, varied through tuning or changing the medium material of the fixture 32.
  • the antenna 20 can be formed with the stamped metal, or bended conductors having uniform cross sections. Further, coupling portion 22, the first radiation portion 24, and the second radiation portion 26 can be formed with a single conductor, and the third radiation portion 28 can be printed directly on the printed circuited board 30 so that costs can be saved.
  • Fig. 5 is a view of a multi-band antenna 40 of the second embodiment according to the present invention.
  • the antenna 40 comprises a coupling portion 42, a first radiation portion 44, a second radiation portion 46, and a third radiation portion 48.
  • the coupling portion 42 is installed on a printed circuit board 50 for feeding-in or feeding-out signals.
  • the printed circuit board 50 is a first surface S1.
  • the first radiation portion 44 and the second radiation portion 46 are installed on a second surface S2 perpendicular to the first surface S1.
  • the first radiation portion 44 and the second radiation portion 46 are coupled to the coupling portion 42.
  • the second surface can be designed as a curved surface to fit the housing of the communication device.
  • the first radiation portion 44 and the second radiation portion 46 comprise at least one section respectively, and one section of the first radiation portion 44 is parallel to one section of the second radiation portion 46 and has an intercoupling with the second radiation portion 46.
  • the third radiation portion 48 is installed above the printed circuit board 50.
  • the third radiation portion 48 is an L-shaped cylindrical conductor, the short section of the third radiation portion 48 is coupled to the coupling portion 42, and the long section of the third radiation portion 48 is parallel to one section of the first radiation portion 44.
  • the first radiation portion 44 and the second radiation portion 46 of the antenna 40 use a stamped metal with the width of 1.0mm to form a radiation surface S2 installed vertically on the printed circuit board 30.
  • the second radiation portion 46 has a longer metal length so as to radiate electromagnetic waves in low frequency bands.
  • high frequency bands such as GSM-1800/1900 (1710 ⁇ 1990MHz), GPS (1575 ⁇ 1.1 MHz)
  • the first radiation portion 24 has a shorter metal length so as to radiate electromagnetic waves in high frequency bands.
  • the L-shaped third radiation portion 28 is installed above the printed circuit board 30 to form an auxiliary antenna.
  • the short section of the third radiation portion 48 is coupled to the radiation surface S2 via the coupling portion 22.
  • the third radiation portion 48 has an intercoupling with the first radiation portion 44 and the second radiation portion 46.
  • the auxiliary antenna can radiate electromagnetic waves in higher frequency bands, such as WCDMA (Wide-band Code-Division Multiple Access) -2100 (1920 ⁇ 2170MHz).
  • WCDMA Wide-band Code-Division Multiple Access
  • the first radiation portion 44, the second radiation portion 46, and the third radiation portion 48 are fixed with a fixture 52 on the printed circuit board 50.
  • the fixture 52 can be a medium material (i.e. a non-conductive material such as plastic etc.).
  • the fixture 52 comprises various holes and rails to fit with the first radiation portion 44 and the second radiation portion 46, and further comprises a groove to support the third radiation portion 48.
  • the fixture 52, the first radiation portion 44, the second radiation portion 46, and the third radiation portion 48 are fixed together, the combination can be easily placed on the circuit board 50 because the fixture 52 can comprise tenons, screw holes etc. to have the combination fixed on the circuit board 50.
  • the fixture 52 not only fixes or protects the first radiation portion 44, the second radiation portion 46, and the third radiation portion 48, but also can be used as a supporting pole for other communications devices.
  • the first radiation portion 44 and the second radiation portion 46 use a stamped metal
  • the third radiation portion 48 uses a cylindrical conductor.
  • the first radiation portion 44, the second radiation portion 46, and the third radiation portion 48 are coupled via the coupling portion 42, so the relative positions of the first radiation portion 44, the second radiation portion 46, and the third radiation portion 48 can be easily adjusted to find the best frequency bands of the antenna 40.
  • Fig. 6 is a top view of the antenna 40 in Fig. 5 .
  • Fig. 7 is a front view of the antenna 40 in Fig. 5 .
  • the distance d2 between the third radiation portion 48 and the radiation surface S2 can be adjusted so that the third radiation portion 48 has an intercoupling with the radiation surface S2 to generate the required bandwidth.
  • the antenna 40 can provide a broad range of services including GSM-850/900, GSM-1800/1900, 3G, WCDMA-2100, UMTS (Universal Mobile Telecommunications System)-2100 (1940 ⁇ 2170MHz), and GPS.
  • Fig. 7 shows the size of the first radiation portion 44 and the second radiation portion 46. The unit is mm.
  • Fig. 8 illustrates the theory of couplings between the low and high frequency radiation portions in a frequency spectrum according to the characteristics of the present invention.
  • the horizontal axis represents frequency and the vertical axis represents frequency spectrum characteristics.
  • the vertical axis can be VSWR (Voltage Standing Wave Ratio) or parameter S11 of the return-loss.
  • VSWR Voltage Standing Wave Ratio
  • S11 parameter S11 of the return-loss.
  • a local minimum of the return-loss S11 in a spectrum can represent a usable bandwidth of an antenna, so the return-loss S11 is usually used to show a radiation characteristic of an antenna, especially in a frequency spectrum.
  • the low frequency radiation portion of the antenna with a longer length induces a low frequency local minimum (indicator A, shown with a broken line) at a low frequency band (i.e. around frequency f0).
  • the antenna induces a high frequency local minimum (indicator C, shown with a broken line) around a frequency f2 at a high frequency band.
  • a bandwidth of the high frequency band can simultaneously support different working bands required by different high frequency communications (2G/3G applications).
  • the antenna of the present invention is especially designed to have a stronger coupling between the low and the high frequency radiation portions, so overall characteristics of the antenna are improved with the intercoupling.
  • the intercoupling causes two effects. First, the intercoupling promotes coupling of harmonics of the low frequency radiation portion and hence induces a local minimum at a harmonic frequency. Secondly, a second harmonic of the low frequency radiation portion can induce another local minimum (indicator B, shown with a broken line) at a frequency f1, which means that the frequency f1 is about twice of the frequency f0, and this helps expand usable bandwidth of the high frequency band.
  • the intercoupling between the low and high frequency radiation portions can also produce equivalent intercoupled or autocoupled inductances and capacitances between each section.
  • the inductance and capacitance lower a Q factor of the antenna accordingly increase or decrease bandwidth of frequency spectrum of the antenna. As the Q factor gets larger, the bandwidth gets smaller. Hence the decrease in Q factor reflects on the spectrum as the increase in bandwidth.
  • curves (indicator D) shown in Fig. 8 since the present invention increases bandwidth with intercoupling effects, the local minimums at frequencies f1 and f2 can expand while the Q factor decreases and combine with each other to form a usable band of high frequency and to fulfill requirements of different wireless communication networks.
  • Fig. 9 shows a frequency spectrum characteristic of the antenna according to the present invention.
  • the horizontal axis represents frequency and the vertical axis represents return-loss S11.
  • the frequency spectrum characteristic as shown in Fig. 8 can be practiced.
  • the antenna supports GSM-850/900 in low frequency band while covering GSM-1800/1900 and UMTS 2100 in the high frequency wideband.
  • the distance between the third radiation portion and the radiation surface can be easily adjusted for expanding usable bandwidth of the high frequency band to support GPS, GSM-1800/1900, and WCDMA-2100/UMTS-2100.
  • a multi-band antenna includes a bent flat copper antenna forming a radiation surface to provide GSM-850/900/1800/1900 or GPS multi-band applications, and an auxiliary antenna coupled to the radiation surface to provide WCDMA-2100 / UMTS-2100 multi-band applications.
  • the radiation surface and the auxiliary antenna are coupled to generate the required bandwidth for multiple radiation bands and to optimize the gain of radiation, so that the multi-band antenna can provide a broad range of services.
  • the antenna according to the present invention can support different working bands required by different high frequency communications (2G/3G applications) and be implemented in compact portable wireless devices.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Support Of Aerials (AREA)
  • Waveguide Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Details Of Aerials (AREA)
EP08002385A 2007-02-09 2008-02-08 Antenne multibande miniaturisée Ceased EP1956679A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2007100080523A CN101242034B (zh) 2007-02-09 2007-02-09 小型化的多频天线

Publications (2)

Publication Number Publication Date
EP1956679A2 true EP1956679A2 (fr) 2008-08-13
EP1956679A3 EP1956679A3 (fr) 2008-09-17

Family

ID=39322249

Family Applications (1)

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EP08002385A Ceased EP1956679A3 (fr) 2007-02-09 2008-02-08 Antenne multibande miniaturisée

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EP (1) EP1956679A3 (fr)
CN (1) CN101242034B (fr)
DE (1) DE08002385T1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101950856A (zh) * 2010-07-19 2011-01-19 中兴通讯股份有限公司 一种多频段天线装置及其应用终端
CN204885426U (zh) * 2015-07-10 2015-12-16 西安中兴新软件有限责任公司 一种多输入多输出天线结构和终端
CN108061830B (zh) * 2017-11-28 2020-03-17 Oppo广东移动通信有限公司 电子设备辐射杂散源定位方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10341310A1 (de) 2002-09-09 2004-03-18 Hitachi Cable, Ltd. Antenne für ein mobiles Telefon
US20040080457A1 (en) 2002-10-28 2004-04-29 Yongxin Guo Miniature built-in multiple frequency band antenna

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020022484A (ko) * 2000-09-20 2002-03-27 윤종용 이동통신 단말기의 내장형 이중대역 안테나 구현장치 및휩 안테나 연동방법
JP2002111344A (ja) * 2000-10-02 2002-04-12 Mitsubishi Electric Corp 携帯無線機
TW549619U (en) * 2002-11-08 2003-08-21 Hon Hai Prec Ind Co Ltd Multi-band antenna
FI116332B (fi) * 2002-12-16 2005-10-31 Lk Products Oy Litteän radiolaitteen antenni
US7119748B2 (en) * 2004-12-31 2006-10-10 Nokia Corporation Internal multi-band antenna with planar strip elements
EP1750323A1 (fr) * 2005-08-05 2007-02-07 Sony Ericsson Mobile Communications AB Dispositif d'antenne multibande pour un dispositif de radiocommunication, et dispositif de radiocommunication avec une telle antenne

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10341310A1 (de) 2002-09-09 2004-03-18 Hitachi Cable, Ltd. Antenne für ein mobiles Telefon
US20040080457A1 (en) 2002-10-28 2004-04-29 Yongxin Guo Miniature built-in multiple frequency band antenna

Also Published As

Publication number Publication date
CN101242034A (zh) 2008-08-13
EP1956679A3 (fr) 2008-09-17
DE08002385T1 (de) 2009-02-26
CN101242034B (zh) 2013-03-13

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