JP3528406B2 - Chip antenna - Google Patents
Chip antennaInfo
- Publication number
- JP3528406B2 JP3528406B2 JP06135896A JP6135896A JP3528406B2 JP 3528406 B2 JP3528406 B2 JP 3528406B2 JP 06135896 A JP06135896 A JP 06135896A JP 6135896 A JP6135896 A JP 6135896A JP 3528406 B2 JP3528406 B2 JP 3528406B2
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- conductors
- chip antenna
- antenna
- winding
- shape
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は、チップアンテナに
関し、特に、携帯移動端末等の、小体積を有する小型携
帯端末に適用されるチップアンテナに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip antenna, and more particularly to a chip antenna applied to a small portable terminal having a small volume such as a portable mobile terminal.
【０００２】[0002]
【従来の技術】従来、携帯移動端末等の小体積の端末に
用いられるアンテナ装置には、アンテナ本体とは別に整
合回路が設けられる。この整合回路は、端末の一層の小
形化にともなうアンテナ本体の体積の減少により生じる
放射抵抗成分に比べて大きい容量成分を打ち消すために
必要である。このようなアンテナ装置を構成するアンテ
ナ本体の例としては、ヘリカルアンテナ、逆Ｆ形アンテ
ナ等があげられる。2. Description of the Related Art Conventionally, an antenna device used for a small volume terminal such as a portable mobile terminal is provided with a matching circuit separately from the antenna body. This matching circuit is necessary in order to cancel out a large capacitance component as compared with the radiation resistance component caused by the reduction in the volume of the antenna body accompanying the further miniaturization of the terminal. Examples of the antenna body that constitutes such an antenna device include a helical antenna and an inverted F-shaped antenna.
【０００３】しかしながら、これらのアンテナ装置で
は、アンテナ本体の小形化にともない整合回路が複雑・
大型化し、体積面から小形化に制限を加える要因とな
る。However, in these antenna devices, the matching circuit becomes complicated due to the miniaturization of the antenna body.
It becomes a large size, and becomes a factor to limit the miniaturization in terms of volume.
【０００４】このような問題点を解決するアンテナとし
ては、図６に示すようなものがある。アンテナ５０は、
３並列ヘリカルアンテナであり、円柱状の誘電体５１の
内部に、誘電体５１の中心軸Ｃに対して、軸対称に互い
に軸に水平な面上で断面を１２０゜の間隔に保って螺旋
状に巻回される３つの導体５２が形成され、誘電体５１
中の１つの端部で電気的に接続され、他端で無接続状態
になっている。この際、電気的接続点を給電部５３とす
れば、高周波部との良好な接合状態を達成することがで
きる。また、中心軸Ｃに水平な導体５２の巻回断面５４
の形状は半径ａの円形状である。As an antenna for solving such a problem, there is an antenna as shown in FIG. The antenna 50 is
It is a three-parallel helical antenna, and has a spiral shape inside a cylindrical dielectric body 51, with cross sections kept at 120 ° intervals on planes that are axially symmetrical to each other with respect to the central axis C of the dielectric body 51. The three conductors 52 wound around the
One of the ends is electrically connected, and the other end is unconnected. At this time, if the electrical connection point is the power feeding portion 53, a good joining state with the high frequency portion can be achieved. In addition, the winding cross section 54 of the conductor 52 horizontal to the central axis C
Is a circular shape with a radius a.
【０００５】[0005]
【発明が解決しようとする課題】ところが、上記の従来
のアンテナである３並列ヘリカルアンテナにおいては、
放射する電波の偏波が単一であり、偏波面が異なる複数
の電波を放射することができない、すなわち指向性が中
心軸Ｃ方向のみであるという問題点があった。However, in the above-mentioned conventional three-parallel helical antenna, which is an antenna,
There is a problem that the radiated radio wave has a single polarization and a plurality of radio waves having different polarization planes cannot be radiated, that is, the directivity is only in the central axis C direction.
【０００６】本発明は、このような問題点を解決するた
めになされたものであり、複数の偏波面に対する指向性
と、広い周波数帯域幅を有するチップアンテナを提供す
ることを目的とする。The present invention has been made to solve such a problem, and an object thereof is to provide a chip antenna having directivity with respect to a plurality of polarization planes and having a wide frequency bandwidth.
【０００７】[0007]
【課題を解決するための手段】上述する問題点を解決す
るため本発明は、互いに平行で、一端が給電部、他端が
自由端の複数の導体が、巻回軸を中心に螺旋状に巻回さ
れ、該巻回軸と直交する巻回断面の形状が少なくとも一
部に直線部を有し、前記複数の導体の給電部が共通に接
続され、かつ、前記複数の導体が同時かつ同相に給電さ
れることを特徴とする。In order to solve the above-mentioned problems, the present invention is directed to a plurality of conductors parallel to each other, one end of which is a feeding portion and the other end of which is a free end, which are spirally formed around a winding axis. The winding section has a linear shape in at least a part of a winding cross section orthogonal to the winding axis, the feeding portions of the plurality of conductors are commonly connected, and the plurality of conductors are in the same phase and in the same phase. It is characterized in that the power is supplied to.
【０００８】また、前記複数の導体を、誘電材料及び磁
性材料の少なくとも一方からなる基体の表面及び内部の
少なくとも一方に形成することを特徴とする。Further, the plurality of conductors are formed on at least one of the surface and the inside of a base made of at least one of a dielectric material and a magnetic material.
【０００９】本発明のチップアンテナによれば、螺旋状
の導体の巻回軸と直交する巻回断面の形状が、少なくと
も一部に直線部を有する略矩形状であるため、巻回断面
の形状が、略円形状、あるいは略楕円形状と比較して、
同一断面積にした場合、アンテナの線路長を長くするこ
とが可能となる。According to the chip antenna of the present invention, the shape of the winding cross section of the spiral conductor, which is orthogonal to the winding axis, is a substantially rectangular shape having a linear portion in at least a part thereof. However, compared to a substantially circular or elliptical shape,
When the cross-sectional area is the same, the line length of the antenna can be increased.
【００１０】[0010]
【発明の実施の形態】以下、図面を参照して本発明の実
施例を説明する。なお、実施例中において、第１の実施
例と同一もしくは同等の部分には同一番号を付し、詳細
な説明は省略する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In the embodiments, the same or equivalent parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.
【００１１】図１に、本発明に係るチップアンテナの第
１の実施例の斜視図を示す。チップアンテナ１０はヘリ
カルアンテナであり、銅あるいは銅合金よりなる３本の
導体１１ａ〜１１ｃを、螺旋状に巻回することにより形
成される。そして、導体１１ａ〜１１ｃのそれぞれの一
端は、共通に接続され給電部１２を形成し、それぞれの
他端は、自由端１３ａ〜１３ｃを形成する。FIG. 1 shows a perspective view of a first embodiment of a chip antenna according to the present invention. The chip antenna 10 is a helical antenna and is formed by spirally winding three conductors 11a to 11c made of copper or copper alloy. Then, one end of each of the conductors 11a to 11c is commonly connected to form the power feeding portion 12, and each of the other ends forms free ends 13a to 13c.
【００１２】この際、導体１１ａ〜１１ｃの巻回軸Ｃと
直交する巻回断面１４の形状は、横の長さｗ、縦の長さ
ｌの長方形状である。また、導体１１ａ〜１１ｃは、巻
回軸Ｃと平行な面１５上で平行になるように形成されて
いる。At this time, the winding cross section 14 orthogonal to the winding axis C of the conductors 11a to 11c has a rectangular shape with a horizontal length w and a vertical length l. The conductors 11a to 11c are formed so as to be parallel to each other on the surface 15 parallel to the winding axis C.
【００１３】ここで、本実施例のチップアンテナ１０の
線路長と、従来例のチップアンテナ５５の線路長を比較
する。Here, the line length of the chip antenna 10 of this embodiment and the line length of the conventional chip antenna 55 will be compared.
【００１４】巻回軸Ｃと直交する巻回断面の面積Ｓと巻
回数Ｎを一定にすると、本実施例のチップアンテナ１
０、従来例のチップアンテナ５５の巻回断面の面積Ｓ
は、それぞれ、
本実施例のチップアンテナ１０の場合：Ｓ＝ｗ×ｌ
従来例のチップアンテナ５５の場合：Ｓ＝πａ2
と表される。If the area S of the winding cross section orthogonal to the winding axis C and the number of windings N are made constant, the chip antenna 1 of this embodiment will be described.
0, the area S of the winding cross section of the conventional chip antenna 55
Are respectively expressed in the case of the chip antenna 10 of the present embodiment: S = w × l in the case of the conventional chip antenna 55: S = πa 2 .
【００１５】従って、線路長は、巻回断面の外周×Ｎで
あるため、本実施例のチップアンテナ１０の線路長
１、従来例のチップアンテナ５５の ２は、それぞれ、
本実施例のチップアンテナ１０の場合： １＝２×（ｗ
＋ｌ）×Ｎ
従来例のチップアンテナ５５の場合： ２＝２×（π×
ｗ×ｌ）1/2 ×Ｎ
となり、本実施例のチップアンテナ１０の線路長 １の
方が長くなることが立証された。Therefore, since the line length is the outer circumference of the winding cross section × N, the line length of the chip antenna 10 of this embodiment is
1 and 2 of the conventional chip antenna 55, respectively, in the case of the chip antenna 10 of the present embodiment: 1 = 2 × (w
+1) × N In the case of the conventional chip antenna 55: 2 = 2 × (π ×
w × l) 1/2 × N, which proves that the line length 1 of the chip antenna 10 of this embodiment is longer.
【００１６】図２に、第１の実施例の変形例の斜視図を
示す。チップアンテナ２０は、第１の実施例のチップア
ンテナ１０と比較して、導体１１ａ〜１１ｃが、巻回軸
Ｃと直交する面２１上で平行になるように形成されてい
る点で異なる。FIG. 2 shows a perspective view of a modification of the first embodiment. The chip antenna 20 differs from the chip antenna 10 of the first embodiment in that the conductors 11a to 11c are formed so as to be parallel to each other on a surface 21 orthogonal to the winding axis C.
【００１７】図３及び図４に、本発明に係るアンテナ装
置の第２の実施例の斜視図及び分解斜視図を示す。3 and 4 are a perspective view and an exploded perspective view of a second embodiment of the antenna device according to the present invention.
【００１８】チップアンテナ３０は、直方体状で実装面
３１１を有する基体３１の内部に、巻回軸Ｃが実装面３
１１と垂直な方向、すなわち基体３１の高さ方向に螺旋
状に巻回される導体３２ａ〜３２ｃを備えてなる。ここ
で、基体３１は、酸化バリウム、酸化アルミニウム、シ
リカを主成分とする誘電材料（比誘電率：約６．１）か
らなる矩形状のシート層３３ａ〜３３ｊを積層してな
る。In the chip antenna 30, the winding axis C is mounted on the mounting surface 3 inside a base 31 having a rectangular parallelepiped mounting surface 311.
The conductors 32a to 32c are spirally wound in a direction perpendicular to the direction 11, that is, in the height direction of the base 31. Here, the base 31 is formed by laminating rectangular sheet layers 33a to 33j made of a dielectric material (relative dielectric constant: about 6.1) containing barium oxide, aluminum oxide, and silica as main components.
【００１９】このうち、シート層３３ａ〜３３ｉの表面
には、銅あるいは銅合金よりなり、略Ｌ字状、略直線状
あるいは略コ字状をなす導電パターン３４ａ〜３４ｉ
が、印刷、蒸着、貼り合わせ、あるいはメッキによって
設けられる。さらに、シート層３３ｂ〜３３ｉの所定の
位置（導電パターン３４ｂ〜３４ｉの一端及びその対応
部）には、厚み方向にビアホール３５が設けられる。Among these, on the surfaces of the sheet layers 33a to 33i, conductive patterns 34a to 34i made of copper or copper alloy and having a substantially L shape, a substantially linear shape or a substantially U shape.
Are provided by printing, vapor deposition, laminating, or plating. Further, via holes 35 are provided in the thickness direction at predetermined positions of the sheet layers 33b to 33i (one end of the conductive patterns 34b to 34i and the corresponding portions).
【００２０】そして、シート層３３ａ〜３３ｉを積層焼
結し、導電パターン３４ａ〜３４ｉをビアホール３５で
接続することにより、基体３１の内部に、巻回断面が矩
形状をなし、基体３１の高さ方向に螺旋状に巻回される
導体３２ａ〜３２ｃが形成される。Then, the sheet layers 33a to 33i are laminated and sintered, and the conductive patterns 34a to 34i are connected by the via holes 35, so that the winding cross section has a rectangular shape inside the base 31 and the height of the base 31 is increased. Conductors 32a to 32c that are spirally wound in the direction are formed.
【００２１】この際、導体３２ａ〜３２ｃのそれぞれの
一端（導電パターン３４ａ〜３４ｃの一端）は、ビアホ
ール３５で共通に接続され、給電部３６を形成する。そ
して、給電部３６は導体３２ａ〜３２ｃに電圧を印加す
るために基体３１の表面に形成された給電用端子３７に
接続される。一方、導体３２ａ〜３２ｃのそれぞれの他
端（導電パターン３４ｇ〜３４ｉの一端）は、基体３１
の内部において自由端３８ａ〜３８ｃを形成する。At this time, one end of each of the conductors 32a to 32c (one end of the conductive patterns 34a to 34c) is commonly connected to the via hole 35 to form a power feeding portion 36. Then, the power feeding section 36 is connected to a power feeding terminal 37 formed on the surface of the base 31 for applying a voltage to the conductors 32a to 32c. On the other hand, the other end of each of the conductors 32a to 32c (one end of the conductive patterns 34g to 34i) is connected to the base 31.
Free ends 38a-38c are formed inside.
【００２２】また、導体３２ａ〜３２ｃの巻回軸Ｃと直
交する巻回断面の形状は、第１の実施例のチップアンテ
ナ１０と同様に長方形状である。さらに、導体３２ａ〜
３２ｃは、巻回軸Ｃと平行な面３９上で平行になるよう
に形成されている。The shape of the winding cross section of the conductors 32a to 32c, which is orthogonal to the winding axis C, is rectangular like the chip antenna 10 of the first embodiment. Further, the conductors 32a to
32c is formed to be parallel to the surface 39 parallel to the winding axis C.
【００２３】図５に、第２の実施例の変形例の斜視図を
示す。チップアンテナ４０は、第２の実施例のチップア
ンテナ３０と比較して、基体３１の内部に形成される導
体３２ａ〜３２ｃが、巻回軸Ｃと直交する面４１上で平
行になるように形成されている点で異なる。FIG. 5 shows a perspective view of a modification of the second embodiment. The chip antenna 40 is formed such that the conductors 32a to 32c formed inside the base 31 are parallel to each other on the surface 41 orthogonal to the winding axis C, as compared with the chip antenna 30 of the second embodiment. It is different in that it is done.
【００２４】以上のように、第１及び第２の実施例、並
びにその変形例では、巻回軸Ｃと直交する３本の導体の
巻回断面の形状が長方形状であるため、円形状あるいは
楕円形状と比較して、線路長を長くすることができる。
従って、電流分布の領域が増えるため、放射する電波の
量が多くなり、アンテナの利得を向上させることができ
る。As described above, in the first and second embodiments and their modifications, the winding cross-sections of the three conductors orthogonal to the winding axis C are rectangular, so that they are circular or The line length can be increased as compared with the elliptical shape.
Therefore, since the area of the current distribution increases, the amount of radio waves radiated increases and the gain of the antenna can be improved.
【００２５】また、巻回軸Ｃと直交する３本の導体の巻
回断面の形状が長方形状であるため、従来と同様の巻回
軸Ｃの方向、すなわちｚ軸方向の指向性に加え、直線部
の方向、すなわちｘ軸及びｙ軸方向の指向性も有する。
すなわち、ｘ軸方向、ｙ軸方向及びｚ軸方向はそれぞれ
直交しているため、ｘ軸方向、ｙ軸方向及びｚ軸方向の
３方向の主偏波及び垂直偏波に対して、無指向性に近い
形で機能することができる。従って、携帯移動端末をど
のような位置に置いても、送受信が可能となり、感度の
姿勢依存性が生じない。Further, since the winding cross-sections of the three conductors orthogonal to the winding axis C are rectangular, in addition to the conventional directivity in the direction of the winding axis C, that is, the z-axis direction, It also has directivity in the direction of the straight line portion, that is, in the x-axis and y-axis directions.
That is, since the x-axis direction, the y-axis direction, and the z-axis direction are orthogonal to each other, omnidirectionality is obtained with respect to main polarization and vertical polarization in the three directions of the x-axis direction, the y-axis direction, and the z-axis direction. Can function in a form close to. Therefore, regardless of the position of the mobile mobile terminal, transmission / reception is possible, and the posture does not depend on the sensitivity.
【００２６】なお、第１及び第２の実施例では、導体が
３本の場合について説明したが、４本以上形成されてい
てもよい。その場合には、利得及び帯域幅をさらに向上
させることが可能となる。In the first and second embodiments, the case where the number of conductors is three has been described, but four or more conductors may be formed. In that case, it is possible to further improve the gain and the bandwidth.
【００２７】また、螺旋状に巻回された導体の巻回軸Ｃ
と直交する巻回断面の形状が略矩形の場合について説明
したが、巻回断面の形状は少なくとも一部に直線部を有
していればよい。この場合には、巻回軸方向及び巻回軸
の垂直方向からの主偏波及び交差偏波に対し感応するた
め、無指向性のチップアンテナとなる。Further, the winding axis C of the spirally wound conductor
Although the description has been given of the case where the shape of the winding cross section orthogonal to is substantially rectangular, the shape of the winding cross section may have a linear portion at least in part. In this case, the chip antenna is omnidirectional because it is sensitive to the main polarization and the cross polarization from the winding axis direction and the direction perpendicular to the winding axis.
【００２８】第２の実施例では、チップアンテナの基体
の形状が直方体状である場合について説明したが、他の
形状、例えば立方体状、円柱状、角錐状、円錐状、球状
等でもよい。In the second embodiment, the case where the base of the chip antenna has a rectangular parallelepiped shape has been described, but other shapes such as a cube, a cylinder, a pyramid, a cone, and a sphere may be used.
【００２９】さらに、基体表面における給電用端子の位
置は、本発明の実施にあたって必須の条件となるもので
はない。Further, the position of the power supply terminal on the surface of the base is not an essential condition for carrying out the present invention.
【００３０】また、導体の全てが基体の内部に設けられ
ている場合について説明したが、導体の全てあるいは放
射導体の一部が基体の表面に設けられていてもよい。Although the case where all of the conductors are provided inside the base body has been described, all of the conductors or a part of the radiation conductor may be provided on the surface of the base body.
【００３１】[0031]
【発明の効果】本発明のチップアンテナによれば、巻回
軸と直交する複数の導体の巻回断面の形状が、少なくと
も一部に直線部を有する形状であるため、円形状あるい
は楕円形状と比較して、線路長を長くすることができ
る。従って、電流分布の領域が増えるため、放射する電
波の量が多くなり、アンテナの利得を向上させることが
できる。According to the chip antenna of the present invention, since the shape of the winding cross section of the plurality of conductors orthogonal to the winding axis is a shape having a linear portion at least in a part, it is circular or elliptical. By comparison, the line length can be increased. Therefore, since the area of the current distribution increases, the amount of radio waves radiated increases and the gain of the antenna can be improved.
【００３２】また、巻回軸と直交する複数の導体の巻回
断面の形状が、少なくとも一部に直線部を有する形状で
あるため、従来と同様の巻回軸の方向に加え、直線部の
方向にも指向性を有する。従って、巻回軸の方向及び直
線部の方向の送受信が可能となり、従来に比べ感度の姿
勢依存性が小さくなる。Further, since the winding cross section of the plurality of conductors orthogonal to the winding axis has a shape having a linear portion at least in a part thereof, in addition to the direction of the winding axis similar to the conventional one, It also has directivity in the direction. Therefore, it is possible to transmit and receive in the direction of the winding axis and the direction of the straight portion, and the posture dependency of sensitivity becomes smaller than in the conventional case.
【図１】本発明のチップアンテナに係る第１の実施例の
斜視図である。FIG. 1 is a perspective view of a first embodiment of a chip antenna according to the present invention.
【図２】図１のチップアンテナの変形例を示す斜視図で
ある。FIG. 2 is a perspective view showing a modified example of the chip antenna of FIG.
【図３】本発明のチップアンテナに係る第２の実施例の
斜視図である。FIG. 3 is a perspective view of a second embodiment of the chip antenna of the present invention.
【図４】図３のチップアンテナの分解斜視図である。FIG. 4 is an exploded perspective view of the chip antenna of FIG.
【図５】図３のチップアンテナの変形例を示す斜視図で
ある。5 is a perspective view showing a modified example of the chip antenna of FIG.
【図６】従来のアンテナを示す斜視図である。FIG. 6 is a perspective view showing a conventional antenna.
１０、２０、３０、４０ チップアンテナ １１ａ〜１１ｃ、３２ａ〜３２ｃ 導体 １２、３６ 給電部 １３ａ〜１３ｃ、３８ａ〜３８ｃ 自由端 １４ 巻回断面 Ｃ 巻回軸 10, 20, 30, 40 chip antenna 11a-11c, 32a-32c conductor 12, 36 power supply 13a-13c, 38a-38c Free end 14 winding cross section C winding axis
Claims (2)
由端の複数の導体が、巻回軸を中心に螺旋状に巻回さ
れ、該巻回軸と直交する巻回断面の形状が少なくとも一
部に直線部を有し、 前記複数の導体の給電部が共通に接続され、 かつ、前記複数の導体が同時かつ同相に給電されること
を特徴とするチップアンテナ。1. A shape of a winding cross section that is formed by spirally winding a plurality of conductors parallel to each other, one end being a power feeding portion and the other end being a free end, and being orthogonal to the winding axis. Has a linear portion in at least a part thereof, the feeding portions of the plurality of conductors are commonly connected, and the plurality of conductors are fed simultaneously and in phase.
料の少なくとも一方からなる基体の表面及び内部の少な
くとも一方に形成することを特徴とする請求項１に記載
のチップアンテナ。2. The chip antenna according to claim 1, wherein the plurality of conductors are formed on at least one of a surface and an inside of a base made of at least one of a dielectric material and a magnetic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06135896A JP3528406B2 (en) | 1996-03-18 | 1996-03-18 | Chip antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06135896A JP3528406B2 (en) | 1996-03-18 | 1996-03-18 | Chip antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09260926A JPH09260926A (en) | 1997-10-03 |
| JP3528406B2 true JP3528406B2 (en) | 2004-05-17 |
Family
ID=13168867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06135896A Expired - Lifetime JP3528406B2 (en) | 1996-03-18 | 1996-03-18 | Chip antenna |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3528406B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100524347B1 (en) * | 2002-05-31 | 2005-10-28 | 한국과학기술연구원 | Ceramic chip antenna |
| JP4478634B2 (en) | 2005-08-29 | 2010-06-09 | 富士通株式会社 | Planar antenna |
-
1996
- 1996-03-18 JP JP06135896A patent/JP3528406B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09260926A (en) | 1997-10-03 |
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