WO2014021081A1 - Appareil d'antenne - Google Patents

Appareil d'antenne Download PDF

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Publication number
WO2014021081A1
WO2014021081A1 PCT/JP2013/069097 JP2013069097W WO2014021081A1 WO 2014021081 A1 WO2014021081 A1 WO 2014021081A1 JP 2013069097 W JP2013069097 W JP 2013069097W WO 2014021081 A1 WO2014021081 A1 WO 2014021081A1
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WO
WIPO (PCT)
Prior art keywords
radiation electrode
electrode
resonance
feeding
antenna
Prior art date
Application number
PCT/JP2013/069097
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English (en)
Japanese (ja)
Inventor
高村亜由美
上西雄二
Original Assignee
株式会社村田製作所
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 株式会社村田製作所 filed Critical 株式会社村田製作所
Publication of WO2014021081A1 publication Critical patent/WO2014021081A1/fr

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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
    • H01Q1/36—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
    • 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
    • H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/335—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors at the feed, e.g. for impedance matching
    • 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
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/378—Combination of fed elements with parasitic elements

Definitions

  • the present invention relates to an antenna device including a feeding radiation electrode connected to a feeding point and a parasitic radiation electrode connected to a ground conductor, and in particular, mobile communication devices such as mobile phone terminals and GPS receivers, and wireless devices.
  • the present invention relates to a small antenna device used in an electronic device having a wireless communication function such as a LAN.
  • Patent Documents 1 and 2 disclose antennas provided in mobile communication devices and electronic devices having a wireless communication function.
  • FIG. 10 is a plan view of the antenna device disclosed in Patent Document 1.
  • the radiation electrode 3 (31, 32, 33, 34) of the antenna is formed on the substrate, a plurality of reactance elements 5 and 6 are inserted in the middle of the radiation electrode, and the feeding electrode 2 and the radiation electrode 3 is inserted in the inductor 11.
  • the resonance frequencies of the fundamental mode and the higher-order mode of the radiation electrode 3 can be adjusted by determining the reactance of the reactance elements 5 and 6.
  • FIG. 11 is a perspective view of a chip antenna provided in the antenna device disclosed in Patent Document 2.
  • the chip antenna 20 is formed on a base body 21, first and second radiation electrodes 22 and 23 constituting comb-shaped electrodes on the upper surface of the base body 21, and side surfaces of the base body 21, and the first radiation is formed.
  • a feeding radiation electrode 24 connected to one end of the electrode 22, a first ground electrode 25 formed on the side surface and connected to the second radiation electrode 23, and terminal electrodes 27 to 29 formed on the bottom surface of the substrate 21.
  • the first terminal electrode 27 is connected to a power supply line formed on the printed board.
  • the second terminal electrode 28 is connected to a ground conductor on the printed board.
  • the resonance frequency of the fundamental mode and the higher order mode can be adjusted by changing the value of the reactance element, but the bandwidth cannot be adjusted.
  • a capacitance is formed in the vicinity of the open end of the radiation electrode and the vicinity of the power feeding portion.
  • the radiation electrode 22 and the second radiation electrode 23, which is a non-feed radiation electrode, are capacitively coupled, and a broadband characteristic is obtained by double resonance.
  • the amount of electromagnetic coupling between the feed radiation electrode and the feed radiation electrode must be optimized. For this purpose, a certain distance is required between the feeding radiation electrode and the non-feeding radiation electrode. This is one factor that prevents miniaturization.
  • An object of the present invention is to provide an antenna device that obtains an optimum amount of coupling between a feeding radiation electrode and a parasitic radiation electrode within a limited area, and is small in size and suitable for a plurality of frequency bands. It is in.
  • the antenna device of the present invention is an antenna having a base and a plurality of radiation electrodes formed on the base.
  • the radiation electrode includes a feed radiation electrode that resonates in a plurality of resonance modes including a higher order resonance mode, and a parasitic radiation electrode that resonates in a higher order resonance mode or a fundamental resonance mode, Double resonance occurs between the resonance mode of the non-feed radiation electrode and the higher-order resonance mode of the feed radiation electrode at a frequency higher than the higher-order resonance mode of the feed radiation electrode, A circuit element is connected in series to the feeding end of the feeding radiation electrode.
  • the current intensity distribution of the higher-order resonance mode of the feed radiation electrode is determined by the circuit element inserted at the feed end of the feed radiation electrode, and the resonance mode of the parasitic radiation electrode and the higher-order resonance mode of the feed radiation electrode are determined. Is determined.
  • the feeding radiation electrode may include a first radiation electrode and a second radiation electrode extending from the first radiation electrode.
  • the current intensity distribution (generated magnetic field distribution) of the radiation electrode changes depending on the value of the circuit element inserted into the feeding end of the radiation electrode.
  • the amount of magnetic coupling between the feed radiation electrode and the parasitic radiation electrode can be adjusted, so that a predetermined frequency characteristic can be obtained without changing the antenna electrode shape. It is done. Further, the degree of freedom in the interval between the feeding radiation electrode and the non-feeding radiation electrode is increased, and a broadband antenna device can be realized by downsizing correspondingly.
  • the frequency of the resonance mode of the non-feeding radiation electrode is higher than the frequency of the higher-order resonance mode of the feeding radiation electrode, and the two resonance modes are magnetically coupled to form a double resonance without causing an antiresonance point. Broadband by double resonance becomes possible.
  • FIG. 1 is a plan view of an antenna device 101 according to an embodiment of the present invention.
  • FIG. 2 is a perspective view of the chip antenna 50.
  • FIG. 3 is a schematic circuit diagram of the antenna device 101 shown in FIG. 4A and 4B are diagrams showing the distribution of current intensity on each electrode of the antenna device 101 in the frequency 5 GHz band.
  • FIG. 5A is a diagram illustrating the frequency characteristics of the return loss (S11) of the antenna 101
  • FIG. 5B is a diagram illustrating the frequency range of 4 GHz to 6 GHz in FIG.
  • FIG. 6A is a diagram showing an impedance trajectory viewed from the feeding point of the antenna 101 on a Smith chart
  • FIG. 6B is a diagram showing a frequency range of 4 GHz to 6 GHz in FIG.
  • FIGS. 7A, 7B, and 7C are plan views of the antenna devices ANT3, ANT4, and ANT5.
  • 8A is a frequency characteristic diagram of the return loss of the antenna ANT3 shown in FIG. 7A
  • FIG. 8B is a frequency characteristic diagram of the return loss of the antenna ANT4 shown in FIG. 7B.
  • FIG. 9A is a plan view of an antenna device 102 according to another embodiment
  • FIG. 9B is a schematic circuit diagram thereof.
  • FIG. 10 is a plan view of the antenna device disclosed in Patent Document 1.
  • FIG. 11 is a perspective view of a chip antenna provided in the antenna device disclosed in Patent Document 2.
  • FIG. 10 is a plan view of the antenna device disclosed in Patent Document 1.
  • FIG. 1 is a plan view of an antenna device 101 according to an embodiment of the present invention.
  • the antenna device 101 includes a substrate 40, various electrodes formed on the substrate 40, a chip antenna 50 mounted on the substrate 40, and circuit elements 61 to 66.
  • a ground conductor 41 is formed on the front and back surfaces of the substrate 40.
  • the ground conductors on the front and back surfaces are connected through a large number of through holes (plated through holes).
  • a ground conductor non-formation region 42 in which no ground conductor is formed is provided on the front and back surfaces of the substrate 40, and a feeding radiation electrode and a parasitic radiation electrode are formed in the ground conductor non-formation region 42.
  • FIG. 2 is a perspective view of the chip antenna 50.
  • the chip antenna 50 includes a rectangular parallelepiped dielectric base 51 and electrodes 52 and 53 formed from the lower surface to the upper surface of the dielectric base.
  • the first feed radiation electrode is constituted by the electrodes 45 and 46 and the electrode 53 of the chip antenna 50 shown in FIG. Further, the electrode 47 and the electrode 52 of the chip antenna 50 constitute a second feeding radiation electrode.
  • a parasitic radiation electrode 48 is formed in the ground conductor non-forming region 42.
  • a power supply electrode 43 and a power supply line 44 are further formed on the substrate 40.
  • a circuit element 63 is mounted in the middle from the first end P11 to the second end P12 of the first feed radiation electrode by the electrodes 45, 46 and the electrode 53 (position near the feed end).
  • a circuit element 62 is mounted between the feed end (first end P11) of the first feed radiation electrode and the feed line 44.
  • a circuit element 64 is mounted in the middle of the second feeding radiation electrode by the electrode 47 and the electrode 52 (near the branch point from the first feeding radiation electrode).
  • the first end P31 of the parasitic radiation electrode 48 is open, and the circuit element 66 is mounted between the second end P32 and the ground conductor 41.
  • a circuit element 65 is mounted between the vicinity of the second end P ⁇ b> 32 of the parasitic radiation electrode 48 and the electrode 45.
  • a circuit element 61 is mounted between the feed line 44 and the ground conductor 41.
  • FIG. 3 is a schematic circuit diagram of the antenna device 101 shown in FIG.
  • the circuit elements 62 and 63 are chip inductors, and the circuit elements 64 to 66 are chip capacitors.
  • the circuit element 61 is a chip inductor.
  • the circuit element 63 is connected in series at a position near the feeding end of the first feeding radiation electrode by the electrodes 45 and 46 and the electrode 53.
  • a circuit element 62 (inductor) is connected in series between the electrode 45 near the feeding end of the first feeding radiation electrode and the feeding line 44.
  • a circuit element 64 (capacitor) is connected in series in the middle of the second feeding radiation electrode by the electrode 47 and the electrode 52 (near the branch point from the first feeding radiation electrode).
  • the grounding end of the parasitic radiation electrode 48 is grounded via a circuit element 66 (capacitor).
  • a circuit element 65 (capacitor) is connected between the vicinity of the ground end of the parasitic radiation electrode 48 and the electrode 45.
  • a circuit element 61 (inductor) is connected to the shunt between the feed line 44 and the ground conductor 41.
  • the circuit element 63 adjusts the frequency of the 1/4 wavelength resonance (fundamental mode) of the first feeding radiation electrode by the electrodes 45 and 46 and the electrode 53.
  • the circuit element 64 adjusts the frequency of the quarter wavelength resonance (fundamental mode) of the second feeding radiation electrode by the electrode 47 and the electrode 52.
  • the circuit element 66 adjusts the frequency of the 1/4 wavelength resonance (fundamental mode) of the parasitic radiation electrode 48.
  • the circuit element 65 adjusts the frequency of the 3/4 wavelength resonance (third mode) by the first feeding radiation electrode.
  • the circuit element 62 adjusts the current intensity distribution on the first feeding radiation electrode by the electrodes 45 and 46 and the electrode 53.
  • the coupling amount between the 1 ⁇ 4 wavelength resonance of the first feeding radiation electrode and the 1 ⁇ 4 wavelength resonance of the parasitic radiation electrode 48 is adjusted, thereby ensuring the bandwidth due to the double resonance.
  • the circuit element 61 matches the impedance of the power feeding circuit with the impedance of the antenna device.
  • FIG. 4 (A) and 4 (B) are diagrams showing the distribution of current intensity on each electrode of the antenna device 101 in the frequency 5 GHz band (4.955 GHz).
  • the current intensity is expressed by concentration.
  • the element values of each circuit element are as follows.
  • the circuit element 62 is set with the inductance of the circuit element 62.
  • the element values of 63 and 64 are also changed.
  • the circuit element 62 Since the circuit element 62 is inserted in series at a position near the feeding end of the first feeding radiation electrode, if the reactance of the circuit element 62 is changed, the circuit element 62 is placed on the first feeding radiation electrode by the electrodes 45 and 46 and the electrode 53. Current distribution changes, and the magnetic field strength distribution changes accordingly.
  • the current intensity distribution on the first feeding radiation electrode, particularly the portion facing the parallel with the parasitic radiation electrode 48 (portion surrounded by an ellipse E in FIGS. 4A and 4B) is the same as that of the first feeding radiation electrode.
  • the magnetic field coupling with the parasitic radiation electrode 48 is affected. Therefore, the amount of coupling between the first feeding radiation electrode and the non-feeding radiation electrode varies depending on the inductance of the circuit element 62. Then, the amount of coupling is optimized so as to ensure the bandwidth due to the double resonance.
  • FIG. 5A is a diagram showing the frequency characteristics of the return loss (S11) of the antenna 101.
  • FIG. 6A is a diagram showing the locus of impedance viewed from the feeding point of the antenna 101 on a Smith chart.
  • FIG. 5B is a diagram showing a frequency range of 4 GHz to 6 GHz in FIG.
  • FIG. 6B is a diagram illustrating a frequency range of 4 GHz to 6 GHz in FIG.
  • Table 1 the conditions of the circuit elements that obtain the characteristics of the antenna devices ANT1 and ANT2 are as shown in Table 1.
  • the return loss is low at the frequencies indicated by (a), (b), (c), and (d).
  • (a) is 1.57 GHz resonance due to 1/4 wavelength resonance of the first feeding radiation electrode (45, 46, 53), and (b) ⁇ ⁇ ⁇ is due to 1/4 wavelength resonance of the second feeding radiation electrode (47, 52).
  • 2. 45 GHz resonance (c) is approximately 5.0 GHz resonance due to 3/4 wavelength resonance of the first feeding radiation electrode (45, 46, 53), and (d) 1 / is 1 ⁇ 4 wavelength of the parasitic radiation electrode 48. The resonance is approximately 5.5 GHz due to resonance.
  • the impedance locus passes through the vicinity of the center of the Smith chart in the 5 GHz band.
  • the impedance locus of ANT1 passes near the center of the Smith chart as compared with the antenna device ANT2. That is, the antenna device ANT1 is more matched.
  • the antenna apparatus ANT1 has a return loss of ⁇ 15 dB over 5.1 to 5.6 GHz. In the antenna device ANT2, a return loss of ⁇ 7 dB is obtained over 4.8 to 5.6 GHz.
  • the 1.5 GHz band is a GPS band, and the 2.4 GHz band and the 5 GHz band are both wireless LAN bands. In this way, it functions as a three-band antenna device.
  • the 1 ⁇ 4 wavelength resonance of the first feeding radiation electrode and the 1 ⁇ 4 wavelength resonance of the parasitic radiation electrode are magnetically coupled.
  • the frequency of the 1/4 wavelength resonance of the parasitic radiation electrode (resonator on the coupling side) indicated by (d) is the first feeding radiation indicated by (c). Since the frequency is higher than the 3/4 wavelength resonance frequency of the electrode, an antiresonance point is generated on the side higher than the resonance frequency of (d). Therefore, double resonance occurs without affecting the passbands (c) to (d).
  • the frequency of the quarter-wave resonance of the parasitic radiation electrode is lower than the frequency of the quarter-wave resonance of the first feed radiation electrode, the frequency is higher than the frequency of the quarter-wave resonance of the parasitic radiation electrode. Since an anti-resonance point is generated, an anti-resonance point is generated between the two frequencies (c) and (d), and broadband characteristics cannot be obtained.
  • the 7 (A), 7 (B), and 7 (C) are plan views of the antenna devices ANT3, ANT4, and ANT5. In these examples, the range including the entire substrate is shown.
  • the structure of the antenna device ANT3 in FIG. 7A is the same as that of the antenna device 101 shown in FIG.
  • the extending direction of the first and second feeding radiation electrodes and the non-feeding radiation electrode is not limited to the direction along the long side of the substrate, but on the short side of the substrate 40 as shown in the antenna device ANT4 in FIG. It may be along the direction.
  • the formation positions of the first and second feed radiation electrodes and the non-feed radiation electrode are not limited to the corners of the substrate 40, but are positions along the sides as shown in the antenna device ANT5 in FIG. 7C. May be.
  • the element values of the circuit elements of the antenna devices ANT3, ANT4, and ANT5 shown in FIGS. 7A, 7B, and 7C are different.
  • the element values of the circuit elements of the antenna devices ANT3 and ANT4 are as follows.
  • FIG. 8A is a frequency characteristic diagram of the return loss of the antenna ANT3 shown in FIG. 7A
  • FIG. 8B is a frequency characteristic diagram of the return loss of the antenna ANT4 shown in FIG. 7B.
  • the numbers Mkr1 to Mkr7 correspond to the mark numbers represented with the triangle symbols in the characteristic diagrams.
  • low return loss characteristics are obtained in the 1.5 GHz band, the 2.4 GHz band, and the 5 GHz band.
  • the return loss characteristics can be obtained in a predetermined frequency band by setting the element values of the respective circuit elements.
  • FIG. 9A is a plan view of an antenna device 102 according to another embodiment different from the antenna device shown in FIG.
  • the antenna device 102 includes a substrate 40, various electrodes formed on the substrate 40, and circuit elements 62 mounted on the substrate 40.
  • the antenna device 102 does not include the chip antenna 50, the electrode 47, and the circuit elements 61, 63, 64, 65, and 66.
  • a circuit element 62 is connected in series to the feeding end of the feeding radiation electrode 46P.
  • One end of the parasitic radiation electrode 48P is directly grounded to the ground conductor 41.
  • Other configurations are the same as those of the antenna device 101.
  • FIG. 9B is a schematic circuit diagram of the antenna device 102.
  • the circuit element 62 is a chip inductor. In this way, the circuit element 62 (inductor) is connected in series between the feeding end of the feeding radiation electrode and the feeding circuit.
  • the circuit element 62 adjusts the current intensity distribution of the portion surrounded by the ellipse E on the feeding radiation electrode 46P. This adjusts the amount of coupling between the 1 ⁇ 4 wavelength resonance of the feed radiation electrode 46P and the 1 ⁇ 4 wavelength resonance of the parasitic radiation electrode 48P, thereby ensuring a bandwidth due to double resonance.
  • the present invention can also be applied to an antenna device including one feeding radiation electrode and one parasitic radiation electrode.
  • the feeding radiation electrode and the parasitic radiation electrode are configured by the electrode pattern on the substrate.
  • the chip antenna is formed by forming the feeding radiation electrode and the parasitic radiation electrode on the dielectric substrate.
  • the chip antenna may be configured and mounted on a substrate.
  • ANT1 to ANT5 ... antenna device P11 ... first end P12 ... second end P31 ... first end P32 ... second end 40 ... substrate 41 ... ground conductor 42 ... ground conductor non-forming region 43 ... feed electrode 44 ... feed line 45, 46, 47 ... electrode 48 ... parasitic radiation electrode 50 ... chip antenna 52, 53 ... electrodes 61-66 ... circuit elements 101, 102 ... antenna device

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  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

La présente invention porte sur un appareil d'antenne (101) qui est configuré par : un substrat (40) ; diverses sortes d'électrodes formées sur le substrat (40) ; et une antenne de puce (50) et des éléments de circuit (62-66), ladite antenne de puce et lesdits éléments de circuit étant montés sur le substrat (40). La fréquence de résonance d'une électrode de rayonnement parasite (48) est supérieure à la fréquence de résonance d'une résonance 3/4 de longueur d'onde d'une première électrode de rayonnement d'alimentation, ladite résonance 3/4 de longueur d'onde étant générée au moyen d'électrodes (45, 46) et d'une électrode (53), et de multiples résonances sont générées avec les deux résonances. Un élément de circuit (62) est connecté en série à une borne d'alimentation électrique (première extrémité (P11)) d'une électrode de rayonnement d'alimentation, et la quantité de couplage des deux résonances est correctement spécifiée avec une valeur de l'élément de circuit.
PCT/JP2013/069097 2012-07-30 2013-07-12 Appareil d'antenne WO2014021081A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012-168207 2012-07-30
JP2012168207 2012-07-30

Publications (1)

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WO2014021081A1 true WO2014021081A1 (fr) 2014-02-06

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112913081A (zh) * 2018-10-31 2021-06-04 京瓷株式会社 天线、无线通信模块以及无线通信设备
CN113594678A (zh) * 2021-07-30 2021-11-02 维沃移动通信有限公司 天线装置及电子设备

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003008326A (ja) * 2001-06-20 2003-01-10 Murata Mfg Co Ltd 表面実装型アンテナおよびそれを用いた無線機
JP2005150937A (ja) * 2003-11-12 2005-06-09 Murata Mfg Co Ltd アンテナ構造およびそれを備えた通信機

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003008326A (ja) * 2001-06-20 2003-01-10 Murata Mfg Co Ltd 表面実装型アンテナおよびそれを用いた無線機
JP2005150937A (ja) * 2003-11-12 2005-06-09 Murata Mfg Co Ltd アンテナ構造およびそれを備えた通信機

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112913081A (zh) * 2018-10-31 2021-06-04 京瓷株式会社 天线、无线通信模块以及无线通信设备
CN112913081B (zh) * 2018-10-31 2024-03-22 京瓷株式会社 天线、无线通信模块以及无线通信设备
CN113594678A (zh) * 2021-07-30 2021-11-02 维沃移动通信有限公司 天线装置及电子设备

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