WO2013183473A1 - Antenne et appareil de communication sans fil - Google Patents

Antenne et appareil de communication sans fil Download PDF

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Publication number
WO2013183473A1
WO2013183473A1 PCT/JP2013/064580 JP2013064580W WO2013183473A1 WO 2013183473 A1 WO2013183473 A1 WO 2013183473A1 JP 2013064580 W JP2013064580 W JP 2013064580W WO 2013183473 A1 WO2013183473 A1 WO 2013183473A1
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WO
WIPO (PCT)
Prior art keywords
radiation electrode
antenna
substrate
electrode
dielectric
Prior art date
Application number
PCT/JP2013/064580
Other languages
English (en)
Japanese (ja)
Inventor
駒木邦宏
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 WO2013183473A1 publication Critical patent/WO2013183473A1/fr

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    • 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
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/378—Combination of fed elements with parasitic elements
    • 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

Definitions

  • the present invention relates to an antenna having a radiation electrode that is capacitively fed from a power feeding circuit, and in particular, mobile communication devices such as mobile phone terminals and GPS receivers, and short-range wireless communications such as Bluetooth (registered trademark) and wireless LAN.
  • mobile communication devices such as mobile phone terminals and GPS receivers
  • short-range wireless communications such as Bluetooth (registered trademark) and wireless LAN.
  • the present invention relates to a small antenna used for an electronic device or the like having a function, and a wireless communication apparatus including the small antenna.
  • FIG. 4 is a perspective view of the chip antenna shown in Patent Document 1.
  • the dielectric substrate 2 has portions 2 a and 2 b having different effective dielectric constants, and a radiation electrode 3 is formed on the surface of the dielectric substrate 2.
  • the radiation electrode 3 has a portion near the power feed end formed in a portion 2b having a high effective dielectric constant, and a portion near the open end formed in a portion 2a having a low effective dielectric constant.
  • the portion 2b having a high effective dielectric constant contributes to downsizing, and the portion 2a having a low effective dielectric constant reduces the gain deterioration due to the overlap with other electronic components.
  • Each effective dielectric constant is selected to contribute.
  • an object of the present invention is to provide an antenna in which the best state is achieved at both the open end and the ground end in a capacitively fed antenna, and a radio communication apparatus including the antenna.
  • the antenna of the present invention includes a dielectric substrate and a radiation electrode formed on the dielectric substrate, and is connected to the substrate.
  • the radiation electrode has a first end connected to the ground and a second end open.
  • a capacitive power supply electrode formed on the dielectric substrate and generating a capacitance with the open end of the radiation electrode;
  • the dielectric base is characterized in that the thickness is different between the vicinity of the second end of the radiation electrode and other than the vicinity of the second end (difference in effective dielectric constant).
  • the dielectric base has a thickness in the vicinity of the second end of the radiation electrode that is thicker than a thickness other than in the vicinity of the second end.
  • the effective dielectric constant in the vicinity of the open end of the radiation electrode can be made higher than the effective dielectric constant other than the open end.
  • the dielectric substrate has a relative dielectric constant of about 3, and a ratio of an effective dielectric constant other than the vicinity of the second end to the vicinity of the second end is 1 ⁇ 2 or less (an effective dielectric other than the vicinity of the second end). It is preferable that the effective dielectric constant of the second end with respect to the ratio is twice or more. As a result, it is possible to effectively suppress the narrowing of the band while ensuring the capacity required for the capacity feeding unit with high accuracy.
  • the dielectric substrate is preferably a dielectric composite resin material molded body in which a dielectric ceramic filler is dispersed in a resin material. Thereby, it can shape
  • the wireless communication apparatus of the present invention includes the antenna having the above-described configuration and a communication circuit connected to the antenna, and the communication circuit is configured on the substrate.
  • the present invention it is possible to suppress inconvenience due to the radiation electrode being formed on the dielectric substrate having a high dielectric constant while taking advantage of the high dielectric constant of the dielectric substrate in the capacitive power feeding section. That is, it is possible to secure a large power supply capacity with high accuracy and to widen the bandwidth.
  • FIG. 1 is a perspective view of an antenna according to an embodiment of the present invention.
  • FIG. 2 is a diagram showing dimensions of each part of the formation part of the first radiation electrode 11.
  • FIG. 3 is a diagram showing the amount of fluctuation of the resonance frequency of the radiation electrode when the relative dielectric constant of the dielectric substrate is changed while the thickness dimension of the dielectric substrate is constant.
  • FIG. 4 is a perspective view of the chip antenna disclosed in Patent Document 1. In FIG.
  • FIG. 1 is a perspective view of an antenna according to an embodiment of the present invention.
  • This antenna is composed of a substrate 20 and an antenna 101 integrated with the housing.
  • the antenna 101 includes a dielectric substrate 10 and an electrode pattern such as a radiation electrode formed on the surface of the dielectric substrate 10.
  • the dielectric substrate 10 is a molded body of a dielectric composite resin material in which a dielectric ceramic filler is dispersed in a resin material.
  • the dielectric substrate 10 is provided with a first radiation electrode 11, a capacitive power supply electrode 12, a second radiation electrode 13, and a third radiation electrode 14.
  • the first radiation electrode 11 has a ground end 11g at the first end and an open end 11e at the second end.
  • a first end of the capacitive power supply electrode 12 is connected to a power supply circuit formed on the substrate 20.
  • a capacitance is formed between the second end of the capacitive power supply electrode 12 and the open end 11 e of the first radiation electrode 11.
  • a first end of the second radiation electrode 13 is directly connected to a power feeding circuit formed on the substrate 20.
  • the first end of the third radiation electrode 14 is connected to the ground electrode of the substrate 20.
  • the third radiation electrode 14 is electromagnetically coupled to the second radiation electrode 13 and acts as a parasitic radiation electrode.
  • the portion of the dielectric substrate 10 on which the first radiation electrode 11 is formed is formed thin with respect to the entire thickness, and a space is formed between the substrate 20 and the substrate 20.
  • the thickness of the dielectric substrate 10 is different between the vicinity of the open end 11e (second end) of the first radiation electrode 11 and other than the vicinity of the second end.
  • the thickness of the dielectric substrate near the open end 11e (second end) of the first radiation electrode 11 is thicker than the thickness of the dielectric substrate other than the vicinity of the second end. Therefore, the effective dielectric constant in the vicinity of the open end 11e of the first radiation electrode 11 is higher than the effective dielectric constant other than the open end 11e.
  • the effective dielectric constant of the dielectric substrate in the capacitive power supply portion of the first radiation electrode 11 is high, a large power supply capacity can be ensured with high accuracy. If the effective dielectric constant of the capacitive power supply unit is low, it is necessary to obtain a predetermined capacity by making the open end 11e of the radiation electrode and the capacitive power supply electrode 12 into a comb shape. In this embodiment, however, the capacitive power supply unit Since the effective dielectric constant of the electrode is high, the electrode in the capacitor forming portion can have a simple structure, can be easily manufactured, can provide a highly accurate capacitor, and is excellent in terms of electrical characteristics.
  • the effective dielectric constant of the dielectric substrate in the most part of the radiation electrode 11 excluding the vicinity of the open end 11e is low, the degree of change of the reactance component due to frequency change is not increased, and broadband characteristics are obtained. Further, although the current density is high in the vicinity of the ground end 11g of the radiation electrode 11, inhibition of current is suppressed by the low effective dielectric constant in the vicinity of the ground end 11g of the radiation electrode 11.
  • the portion of the dielectric substrate 10 on which the second radiation electrode 13 and the third radiation electrode 14 are formed is also thinly formed with respect to the entire thickness, and a space is formed between the substrate 20 and the substrate 20. Therefore, since the effective dielectric constant of the dielectric substrate is low, the degree of change of the reactance component due to frequency change is not increased, and broadband characteristics can be obtained.
  • a communication circuit connected to the capacitive power supply electrode 12 and a communication circuit connected to the second radiation electrode 13 are configured on the substrate 20 shown in FIG.
  • the antenna 101 is integrated with a housing of a wireless communication device such as a mobile phone terminal, and the communication circuit is connected to the capacitive power supply electrode 12 and the second radiation via pin terminals in a state where the substrate 20 is incorporated in the housing. Connected to the electrode 13. In this way, the wireless communication device is configured.
  • FIG. 2 is a diagram showing dimensions of each part of the formation part of the first radiation electrode 11. The dimensions of each part are as follows.
  • the dielectric substrate has a relative dielectric constant ⁇ r of 15.
  • the radiation efficiency of the first radiation electrode of the antenna 101 of the present invention was ⁇ 2.5 dB.
  • the antenna of the comparative example is used.
  • the radiation efficiency of the antenna was -3.2 dB. Therefore, in this example, the radiation efficiency is improved by 0.7 dB.
  • the area near the open end 11e of the radiation electrode 11 needs to earn more area facing the capacitive power supply electrode 12. Therefore, the vicinity of the open end 11e of the radiation electrode and the capacitive power supply electrode 12 are comb-shaped, and the gap is narrowed, the number of teeth is increased, and the tooth length is increased. Thus, since the shape of the vicinity of the open end 11e of the radiation electrode and the capacitive power supply electrode 12 is complicated, the resonance frequency of the radiation electrode 11 is also affected. Therefore, the ratio of the change in the resonance frequency of the radiation electrode with respect to the change in the dielectric constant of the dielectric substrate increases as the dielectric constant of the dielectric substrate decreases.
  • FIG. 3 is a diagram showing a fluctuation amount of the resonance frequency of the radiation electrode when the effective relative dielectric constant between the open end of the radiation electrode and the capacitive power supply electrode is changed.
  • the effect of the dielectric can be obtained if the effective relative dielectric constant of the capacitive power feeding unit is 6.3 or more.
  • ABS resin is used for the dielectric substrate, and the dielectric constant of this ABS is about 3 (about 2.4 to 4).
  • the degree of change in the reactance component due to frequency change is small, and narrow band characteristics are not obtained, but the advantage of downsizing due to the wavelength shortening effect is obtained.
  • the capacity required for the capacity feeding section cannot be secured with high accuracy.
  • the substrate is made of a dielectric material having a high dielectric constant having a relative dielectric constant of 6.3 or more, the advantage of downsizing due to the wavelength shortening effect can be obtained, and the capacity necessary for the capacitive power feeding section can be ensured with high accuracy.
  • the degree of change in the reactance component due to the change in frequency increases, resulting in narrowband characteristics. Therefore, if the base is made of a high dielectric constant dielectric material having a relative dielectric constant of 6.3 or more and the effective dielectric constant other than that of the capacitive power feeding portion is about 3.0, the size can be reduced without narrowing the band.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Support Of Aerials (AREA)
  • Details Of Aerials (AREA)

Abstract

L'invention concerne une antenne comprenant un substrat (20), ainsi qu'une antenne formant partie intégrante avec un boîtier. L'antenne (101) comprend un corps de base en matériau diélectrique (10), et un motif d'électrode d'une électrode rayonnante ou analogue, lequel motif d'électrode est formé sur la surface du corps de base en matériau diélectrique (10). Le corps de base en matériau diélectrique (10) comporte une première électrode rayonnante (11) et une électrode d'alimentation capacitive (12). La première électrode rayonnante (11) a une première extrémité servant d'extrémité de mise à la terre (11g), et une seconde extrémité servant d'extrémité ouverte (11e). La première extrémité de l'électrode d'alimentation capacitive (12) est connectée à un circuit d'alimentation électrique formé sur le substrat (20). La seconde extrémité de l'électrode d'alimentation capacitive (12) forme une capacitance entre la seconde extrémité et l'extrémité ouverte (11e) de la première électrode rayonnante (11). L'épaisseur de la partie du corps de base en matériau diélectrique proche de l'extrémité ouverte (11e) de la première électrode rayonnante (11) est supérieure à l'épaisseur des parties du corps de base en matériau diélectrique autres que la partie proche de la seconde extrémité.
PCT/JP2013/064580 2012-06-08 2013-05-27 Antenne et appareil de communication sans fil WO2013183473A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012130974 2012-06-08
JP2012-130974 2012-06-08

Publications (1)

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WO2013183473A1 true WO2013183473A1 (fr) 2013-12-12

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106463827A (zh) * 2014-03-13 2017-02-22 华为终端有限公司 一种天线及终端

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003198239A (ja) * 2001-12-25 2003-07-11 Hitachi Metals Ltd 表面実装型アンテナ
JP2004208202A (ja) * 2002-12-26 2004-07-22 Kyocera Corp アンテナおよびそれを用いた通信機器

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003198239A (ja) * 2001-12-25 2003-07-11 Hitachi Metals Ltd 表面実装型アンテナ
JP2004208202A (ja) * 2002-12-26 2004-07-22 Kyocera Corp アンテナおよびそれを用いた通信機器

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106463827A (zh) * 2014-03-13 2017-02-22 华为终端有限公司 一种天线及终端
CN106463827B (zh) * 2014-03-13 2019-11-01 华为终端有限公司 一种天线及终端

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