WO2010125240A1 - Combinaison d'antennes - Google Patents

Combinaison d'antennes Download PDF

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Publication number
WO2010125240A1
WO2010125240A1 PCT/FI2010/050341 FI2010050341W WO2010125240A1 WO 2010125240 A1 WO2010125240 A1 WO 2010125240A1 FI 2010050341 W FI2010050341 W FI 2010050341W WO 2010125240 A1 WO2010125240 A1 WO 2010125240A1
Authority
WO
WIPO (PCT)
Prior art keywords
radiator
antenna
planar portion
feed point
ground plane
Prior art date
Application number
PCT/FI2010/050341
Other languages
English (en)
Inventor
Heikki Korva
Original Assignee
Pulse Finland Oy
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 Pulse Finland Oy filed Critical Pulse Finland Oy
Priority to CN2010800193324A priority Critical patent/CN102422484A/zh
Publication of WO2010125240A1 publication Critical patent/WO2010125240A1/fr

Links

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
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
    • H01Q21/061—Two dimensional planar arrays
    • H01Q21/065—Patch antenna array
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
    • 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
    • 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
    • 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
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • 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 invention relates to an antenna combination, in which at least two antennas operating in different bands have separate feeds of their own, the combination being intended especially for small mobile terminals.
  • radio systems are i.a. US-GSM, or GSM850, GSM900, GSM1800, GSM1900 (Global System for Mobile telecommunications), WCDMA (Wideband Code Division Multiple Access) and WLAN (Wireless Local Area Network).
  • the radio systems use differ- ent frequency ranges, which means that the design of the device's antenna structure becomes more difficult particularly when it has to be implemented as an internal structure of a small-sized device.
  • a separate antenna would be made for each radio system to obtain good matching in the required frequency ranges. However, in this case the antennas with their matching circuits would take up too much space.
  • the antenna type can be PIFA (Planar Inverted-F Antenna) used generally in the mobile terminals, which antenna comprises a radiating plane and ground plane one on top of the other, connected to each other by a short-circuit conductor.
  • PIFA Planar Inverted-F Antenna
  • the PIFA's operating band for the higher band remains too narrow, when the higher band must cover, besides the frequency range of the higher GSM systems, also the frequency range of the WCDMA system.
  • the higher band is 1710— 2170 MHz.
  • the inadequacy of the bandwidth of the PIFA becomes more obvious, when the radio device is very flat, because then the distance between the radiating plane and ground plane remains clearly smaller than the optimal value.
  • a PILA Planar Inverted-L Antenna
  • the antenna can be provided with a matching circuit so that the bandwidth increases in comparison to the corresponding PIFA.
  • Fig. 1 shows as a circuit diagram an example of such a solution.
  • the radiator of the first antenna, or the first radiator 1 10, for the lower band, the radiator of the second antenna, or the second radiator 120, for the higher band, and a part of the circuit board PCB of the radio device in question are visible in the figure.
  • the matching circuit of the first antenna which consists of the parallel circuit of a coil L11 and capacitor C1 1.
  • One end of the matching circuit is connected to the ground plane, or ground GND, and the other end to the feed conductor of the first antenna which starts from the first antenna port AP1 and continues via the first feed point FP1 to the first radiator 110.
  • the matching circuit of the second antenna which consists of the parallel circuit of a coil L12 and capacitor C12.
  • this matching circuit is connected to the ground plane GND and the other end to the feed conductor of the second antenna which starts from the second antenna port AP2 and continues via the second feed point FP2 to the second radiator 120.
  • the radiators are plane-like, and the ground plane GND extends under them.
  • a flaw of the solution according to Fig. 1 is that the place of an operating band of the antenna is sensitive to the variation of the component values of the matching circuit.
  • changing the inductance value of matching circuit requires changing the layout of the whole circuit board, when the coil has been implemented as planar, which otherwise is an advantageous way.
  • the components of the matching circuit also take up space remarkably on the circuit board.
  • An object of the invention is to alleviate the aforementioned flaws related to the prior art.
  • An antenna according to the invention is characterized by what is set forth in the independent claim 1. Some advantageous embodiments of the invention are disclosed in the other claims.
  • the antenna structure of a radio de- vice comprises two antennas provided with feeds of their own.
  • One antenna is primarily for the lower band and the other for the higher band.
  • the radiator of the former antenna, or the first radiator comprises a relatively narrow first portion starting from its feed point and then a planar portion, which is wide in respect of the first portion.
  • the first portion comprises, for improving the matching and bandwidth of the antenna, a conductor pattern with a strip conductor, which extends from the starting end of the first portion between the tail end of the planar portion and the second radiator, the strip conductor being provided with a ground coupling.
  • the radiators are apart from the circuit board of a radio device.
  • An advantage of the invention is an adequate capability is achieved for the parts of an antenna structure for the lower and higher band without matching circuits on the circuit board of a radio device, which circuits require space and are sensitive.
  • the conductor pattern being included into the radiating conductor has an inductive part between the feed point and ground.
  • the improvement is due to the fact that the third harmonic of the basic resonance frequency of the first antenna decreases close to the resonance frequency of the second antenna because of the effect of the portion of said conductor pattern, which extends between the first and second radiator, the operating band of the second antenna becoming thus broader.
  • Another advantage of the invention is that the tuning of the antenna does not require changes on the circuit board of the radio device, because the necessary changes can be implemented in the radiator pattern.
  • a further advantage of the invention is that the efficiency of the antenna improves in comparison to the corresponding known antennas.
  • Fig. 1 presents an example of the known combination of two antennas
  • Fig. 2 presents as a circuit diagram the principle of the antenna combination according to the invention
  • Fig. 3 presents a practical example of the antenna combination according to the invention
  • Fig. 4 presents another example of the antenna combination according to the invention
  • Fig. 5 presents an example of the band characteristics of the antenna combination according to the invention.
  • Fig. 6 presents an example of the efficiency of the antenna combination ac- cording to the invention.
  • Fig. 1 was already described in connection with the description of prior art.
  • Fig. 2 is a principled presentation about the antenna combination according to the invention.
  • the radiator of the first antenna, or the first radiator 210, for the lower band, the radiator of the second antenna, or the second radiator 220, for the higher band, and a part of the circuit board PCB of the radio device in question are visible in the figure.
  • the radiators are apart from the circuit board. Instead, on the circuit board there is the ground plane GND which is a part of each antenna.
  • the antennas have separate feeds: The feed conductor of the first antenna starts from the first antenna port AP1 and continues via the first feed point FP1 to the first radiator 210.
  • the feed conductor of the second antenna starts from the second antenna port AP2 and continues via the second feed point FP2 to the second radiator 220.
  • a capacitive element C21 is on the circuit board PCB for the matching of the first antenna, one end of which element is connected to the ground plane and the other end to the first feed conductor close to the first feed point.
  • the first radiator 210 comprises the radiating part 21 A proper and the conductor pattern 21 B according to the invention.
  • This conductor pattern is shown only symbolically in the principled figure 2. It comprises a conductor, which extends from the first end of the first radiator between its tail end and the second radiator, and another conductor, which continues from that conductor to the ground plane GND in the first grounding point GP1.
  • the matching of the first antenna is improved by the conductor pattern 21 B.
  • the conductor pattern 21 B causes a decrease in the third harmonic of the basic resonance frequency of the first antenna so that the third harmonic resonance becomes useful in the higher band.
  • a short-circuit conductor by which the second radiator 220 is connected to the ground plane in the second grounding point GP1 , is enough for the matching of the second antenna.
  • the bandwidth of the second antenna is adequate thanks to the above-mentioned harmonic resonance of the first antenna, in which case a matching circuit like the one in Fig. 1 is then needless.
  • Fig. 3 shows a practical example of the antenna combination according to the invention.
  • a part of the circuit board PCB of a radio device and an antenna component 300 are visible in the drawing, the antenna component being here mounted at one end of the circuit board.
  • the surface of the circuit board is mostly of conductive signal ground GND which functions as the ground plane of the antennas.
  • the antenna component 300 comprises a dielectric support frame 350 and on its surface the radiator of the first antenna, or the first radiator 310, and the radiator of the second antenna, or the second radiator 320.
  • the support frame has i.a. an upper surface, a head surface parallel to the end of the circuit board on the side of this end and a first and second side surface parallel to the sides of the circuit board adjacent to these sides.
  • the support frame is hollow, in other words it con- sists only of thin walls.
  • the feed point of the first radiator 310, or the first feed point FP1 is on the circuit board PCB at the lower edge of the head surface of the support frame.
  • the first radiator comprises a relatively narrow first portion 31 1 on the head surface of the support frame, which starts from the feed point FP1 , makes in this example a Pi-shaped bend towards the upper surface, then continues in the di- rection of the head close to the first side surface of the support frame and rises to the upper surface.
  • planar portion 312 In the direction of the head the planar portion extends to the line of the starting end of the first portion and the first feed point FP1 , in the example of Fig. 3 even pass this line, or closer to the second side surface.
  • the first end and tail end of the first radiator are thus located close to each other in respect of the size of the radiator.
  • the planar portion 312 may further comprise an extension to the first side surface.
  • the first radiator 310 further comprises a coupling strip 313, 314 which branches from the starting end of the first portion 31 1 and extends to the upper surface of the support frame 350 and there next to the tail end of the planar portion 312 in the direction perpendicular to the head direction.
  • a slot remains between the coupling strip and the tail end of the planar portion 312, the width of which slot is e.g. one per cent of the physical length of the first radiator, as millimetres less than 1 mm. This means a remarkable electromagnetic coupling between these parts.
  • the coupling strip has been connected galvanically to the ground plane GND by a ground strip which branches from the coupling strip at the boundary of its cross portion 313 in the direction of the head and the tail portion 314 continuing to the upper surface.
  • the first radiator then has also a ground point, or the first grounding point GP1 , on the circuit board PCB at the lower edge of the head surface of the support frame.
  • a ground point or the first grounding point GP1
  • an inductance which is mainly due to said cross portion 313 of the coupling strip and corresponds to the inductance of the matching coil L1 1 on the circuit board, seen in Fig. 1.
  • a capacitive element connected between the feed point FP1 and ground plane and belonging to the matching circuit of the first antenna, can be on the circuit board PCB, as in Fig. 2.
  • Fig. 2 In the example of Fig.
  • the first radiator 310 further comprises an auxiliary strip 315 which branches from the starting end of its first portion towards the first side surface of the support frame. This strip is relatively close to the upper surface so that it has a significant coupling to the radiator's planar portion at its side edge.
  • the feed point of the second radiator 320 is on the circuit board PCB at the lower edge of the head surface of the support frame, next to the above-mentioned first grounding point GP1. From the feed point FP2 the radiating conductor rises to the upper surface of the support frame, of which surface it covers a part on the side of the second side surface and also extends some to the second side surface. The opposite edge of the radiator 320 runs close to said tail portion 314 of the coupling strip, the distance being at its minimum one millimetre at the most.
  • the second radiator is short-circuited to the ground plane in the second grounding point GP2 which is located on the circuit board PCB in the corner of the head surface and the second side surface of the support frame.
  • a slot SLT remains on the upper surface between the area of the second radiator joining the second grounding point GP2 and the area joining the second feed point FP2, the length of which slot affects the resonance frequency and also the bandwidth of the second antenna.
  • the tail end 314 of the coupling strip be- longing to the first radiator is located between the planar portion 312 of the first radiator and the second radiator 320, the electromagnetic coupling being significant to both directions.
  • the first radiator is made to function as a parasitic auxiliary radiator of the second radiator so that the third harmonic frequency of the basic resonance frequency of the first antenna falls close to the resonance frequency of the second antenna, thus broadening the operating band of the second antenna.
  • said third harmonic would be located at a considerably higher frequency, when the basic resonance frequency is located at a fixed point in the lower band.
  • the ratio of the third harmonic to the basic resonance frequency lessens because of the influence of the coupling between the coupling strip 314 and the planar portion of the first radiator and also of the coupling between said auxiliary strip 315 and the planar portion of the first radiator.
  • the basic resonance frequency is here accounted as the first harmonic.
  • the ground plane GND of the antennas extends below the first and second radiator except for the strips on the side surfaces of the support frame.
  • the support frame 350 belonging to the antenna component 300 may form an (almost) closed room which at the same time functions as the speaker chamber of the radio device.
  • Fig. 4 shows another example of the antenna combination according to the inven- tion.
  • the radiators are of conductive coating of a small dielectric plate, and they together constitute a plate-like antenna component 400. This is supported to the circuit board PCB of a radio device above the ground plane GND.
  • the first radiator 410 comprises, starting from its feed point FP1 , first a relatively narrow first portion 41 1 and then in the opposite direction a relatively wide planar portion 412.
  • the first radiator further comprises a coupling strip 413, 414 connected to the ground plane, which branches from the starting end of the first portion 41 1 and extends next to the tail end of the planar portion 412, as in Fig. 3.
  • the cross portion 413 belonging to the coupling strip causes inductance between the first feed point FP1 and first grounding point GP1 for the matching of the antenna.
  • the second radiator 420 has the second feed point FP2 and second grounding point GP2, and it extends close to the tail end 414 of said coupling strip for utilizing the third harmonic of the basic resonance of the first antenna, as in Fig. 3.
  • Fig. 5 shows an example of the band characteristics of an antenna combination according to the invention as curves of the reflection coefficient S1 1.
  • the example concerns the structure according to Fig. 3.
  • Curve 51 shows the reflection coefficient as the function of frequency, when the first antenna is fed and curve 52 the reflection coefficient as the function of frequency, when the second antenna is fed.
  • a resistor with nominal impedance 50 ⁇ has been connected to the antenna port of the other antenna.
  • the lower operating band of the antenna combination well covers the lower band w1 , or the frequency range 824-960 MHz used by the systems GSM850 and GSM900 together.
  • the upper operating band of the antenna combination well covers the higher band w2, or the frequency range 1710-2170 MHz used by the systems GSM1800, GSM1900 and WCDMA together.
  • the upper operating band of the antenna combination is based on the resonance r2 of the second antenna and on the third harmonic resonance r3 of the basic resonance M of the first antenna.
  • the frequency of the resonance r3 is about 2.1 GHz, in which case the covering of the frequency range of the WCDMA system is achieved by means of it.
  • FIG. 6 shows an example of the efficiency of an antenna combination according to the invention.
  • the example concerns the structure according to Fig. 3 in free space.
  • the efficiency has been indicated with decibels, 0 dB then corresponding the ideal, or lossless, case.
  • Curve 61 shows the fluctuation of the efficiency as the function of frequency, when the first antenna is fed and curve 62 the fluctuation of the efficiency as the function of frequency, when the second antenna is fed.
  • a resistor with nominal impedance 50 ⁇ has been connected to the antenna port of the other antenna.
  • the isolation attenuation between the antennas represents such an effect, which attenuation is found out, when a test transmitting signal with a changing frequency is fed to one antenna port and the level is measured in the other.
  • the isolation attenuation is the ratio of the level of the test transmitting signal to the measured level, which ratio should in other words be as high as possible.
  • the isolation attenuation naturally has the lowest values in the ranges of the operating bands of the antenna combination.
  • the first minimum, about 17 dB, is around the frequency 825 MHz and the second minimum, about 7 dB, is around the frequency 2.1 GHz.
  • This frequency is the frequency of the third harmonic of the first antenna, and the relatively low isolation at- tenuation is caused by the fact that the first radiator is expressly used as a parasitic element of the second radiator at the frequency in question.
  • the qualifier 'below' as well as 'upper surface' and lower edge' refer to the position of the antenna component in Fig. 3.
  • the use position of the antenna component can naturally be any.

Abstract

L'invention porte sur une combinaison d'antennes qui est destinée à de petites stations mobiles et dans laquelle deux des antennes sont munies de leur propre alimentation. Une antenne est principalement pour la bande inférieure et l'autre pour la bande supérieure. L'élément rayonnant de la première antenne, ou premier élément rayonnant (310), comporte une première partie relativement étroite (311), partant de son point d'alimentation (FP1), et ensuite une partie plane (312), qui est large par rapport à la première partie. De plus, la première partie comporte, pour améliorer l'adaptation d'impédance et la bande passante de l'antenne, un motif conducteur avec un ruban conducteur (313, 314) qui s'étend de l'extrémité de départ de la première partie entre l'extrémité de queue de la partie plane et le second élément rayonnant, le ruban conducteur étant muni d'un couplage à la masse. Les éléments rayonnants sont séparés de la carte de circuit imprimé (PCB) d'un dispositif radio. Une capacité adéquate est obtenue pour les parties d'une structure d'antenne pour les bandes inférieure et supérieure sans circuits d'adaptation sur la carte de circuit imprimé d'un dispositif radio, lesquels circuits nécessitent de l'espace et sont sensibles.
PCT/FI2010/050341 2009-04-27 2010-04-27 Combinaison d'antennes WO2010125240A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2010800193324A CN102422484A (zh) 2009-04-27 2010-04-27 天线组合

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20095468A FI20095468A (fi) 2009-04-27 2009-04-27 Antenniyhdistelmä
FI20095468 2009-04-27

Publications (1)

Publication Number Publication Date
WO2010125240A1 true WO2010125240A1 (fr) 2010-11-04

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ID=40590346

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2010/050341 WO2010125240A1 (fr) 2009-04-27 2010-04-27 Combinaison d'antennes

Country Status (3)

Country Link
CN (1) CN102422484A (fr)
FI (1) FI20095468A (fr)
WO (1) WO2010125240A1 (fr)

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WO2013185654A1 (fr) * 2012-07-11 2013-12-19 中兴通讯股份有限公司 Antenne et dispositif terminal
CN108173000A (zh) * 2016-12-07 2018-06-15 深圳富泰宏精密工业有限公司 天线结构及具有该天线结构的无线通信装置
WO2019135458A1 (fr) * 2018-01-04 2019-07-11 Lg Electronics Inc. Terminal mobile

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CN104733861A (zh) * 2013-12-20 2015-06-24 深圳富泰宏精密工业有限公司 天线结构及具有该天线结构的无线通信装置
CN205029003U (zh) * 2015-07-27 2016-02-10 禾邦电子(苏州)有限公司 一种包括天线的电子设备
CN106684565B (zh) * 2015-11-11 2021-02-09 深圳富泰宏精密工业有限公司 天线模组及应用该天线模组的无线通信装置
CN105977612A (zh) * 2015-12-15 2016-09-28 乐视移动智能信息技术（北京）有限公司 一种超宽频寄生天线及移动终端
CN108963428B (zh) * 2018-06-13 2020-08-21 瑞声精密制造科技(常州)有限公司 天线系统及移动终端
CN109687097B (zh) * 2018-12-12 2021-09-03 惠州Tcl移动通信有限公司 天线和移动终端
CN110289885B (zh) * 2019-07-02 2021-03-02 维沃移动通信有限公司 一种天线调谐方法及终端

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WO2008023095A1 (fr) * 2006-08-25 2008-02-28 Pulse Finland Oy Antenne à plusieurs résonances
US7450076B1 (en) * 2007-06-28 2008-11-11 Cheng Uei Precision Industry Co., Ltd. Integrated multi-band antenna
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US6476769B1 (en) * 2001-09-19 2002-11-05 Nokia Corporation Internal multi-band antenna
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US7450076B1 (en) * 2007-06-28 2008-11-11 Cheng Uei Precision Industry Co., Ltd. Integrated multi-band antenna

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Publication number Priority date Publication date Assignee Title
WO2013185654A1 (fr) * 2012-07-11 2013-12-19 中兴通讯股份有限公司 Antenne et dispositif terminal
CN103545598A (zh) * 2012-07-11 2014-01-29 中兴通讯股份有限公司 一种天线及终端设备
US9608311B2 (en) 2012-07-11 2017-03-28 Zte Corporation Antenna and terminal device
CN103545598B (zh) * 2012-07-11 2017-05-24 南京中兴新软件有限责任公司 一种天线及终端设备
CN108173000A (zh) * 2016-12-07 2018-06-15 深圳富泰宏精密工业有限公司 天线结构及具有该天线结构的无线通信装置
WO2019135458A1 (fr) * 2018-01-04 2019-07-11 Lg Electronics Inc. Terminal mobile
US10658732B2 (en) 2018-01-04 2020-05-19 Lg Electronics Inc. Mobile terminal
US10879593B2 (en) 2018-01-04 2020-12-29 Lg Electronics Inc. Mobile terminal

Also Published As

Publication number Publication date
CN102422484A (zh) 2012-04-18
FI20095468A (fi) 2010-10-28
FI20095468A0 (fi) 2009-04-27

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