JP2003110344A - Surface-mounting type antenna and antenna device mounting the same - Google Patents

Surface-mounting type antenna and antenna device mounting the same

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Publication number
JP2003110344A
JP2003110344A JP2001294444A JP2001294444A JP2003110344A JP 2003110344 A JP2003110344 A JP 2003110344A JP 2001294444 A JP2001294444 A JP 2001294444A JP 2001294444 A JP2001294444 A JP 2001294444A JP 2003110344 A JP2003110344 A JP 2003110344A
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antenna
ground conductor
surface
radiation electrode
substrate
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JP2001294444A
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Japanese (ja)
Inventor
Hiroshi Aoyama
Hidetoshi Hagiwara
Keiko Kikuchi
Yasunori Takagi
慶子 菊地
英俊 萩原
博志 青山
保規 高木
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Hitachi Metals Ltd
日立金属株式会社
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Priority to JP2001294444A priority Critical patent/JP2003110344A/en
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Abstract

PROBLEM TO BE SOLVED: To provide a surface mounting type antenna, to which directivity and bandwidth which are optimum to an antenna for Blue tooth are imparted, and an antenna device mounting the surface-mounting type antenna. SOLUTION: In the surface-mounting type antenna, a main radiation electrode and an auxiliary radiation electrode are arranged facing each other on dielectric or magnetic base material and are connected by using a connecting conductor. Since a style is used, where power feeding is performed to a junction part between the connecting conductor and the radiation electrodes by using a strip line, an impedance matching circuit is unnecessary, and very compact mounting is enabled.

Description

【発明の詳細な説明】 【0001】 【発明の属する技術分野】本発明は、誘電体もしくは磁性体の基体に放射電極を配するアンテナとそれを搭載するアンテナ装置に係り、特にブルートゥースや無線LA BACKGROUND OF THE INVENTION [0001] [Technical Field of the Invention The present invention relates to an antenna device for antenna and mounting it to dispose the radiation electrode to the substrate of the dielectric or magnetic material, in particular a Bluetooth or wireless LA
N(Local Area Network)に好適な表面実装型アンテナに関する。 N of the preferred surface-mounted antenna to (Local Area Network). 【0002】 【従来の技術】誘電体もしくは磁性体基体上に放射電極等を配置し、直接回路基板に搭載可能とした表面実装型のチップアンテナが、携帯電話などの無線通信装置に幅広く使用されている。 [0002] Place the Related Art dielectric or magnetic base on the radiation electrode or the like, it can be mounted with surface-mount chip antenna directly circuit board, widely used in wireless communication devices such as mobile phones ing. 一方、携帯電話やパソコン間を無線で結合する近距離無線規格のブルートゥース(Bluetoo On the other hand, the short-range wireless standard that couples between mobile phones and computers wireless Bluetooth (Bluetoo
th)が本格的に稼動を開始した。 th) has started a full-scale operation. 無線LANにおけるブルートゥースは周知のように、略2.44GHz±40MHz Bluetooth as well known in the wireless LAN, a substantially 2.44 GHz ± 40 MHz
の周波数域が使われ、半径10m程度の至近距離をカバーすればよいとされている。 Used frequency range, are the may be covered close range radius of about 10 m. パソコン等に組み込まれるアンテナは、指向性および帯域幅等の特性面ばかりか、 Antenna incorporated in a personal computer or the like, not only characteristic surface such as directivity and bandwidth,
実装性に優れていることが要求される。 It is required to have excellent mountability. 従来、無線LA Traditionally, wireless LA
Nあるいはブルートゥース用アンテナとして、マイクロストリップアンテナや逆F型アンテナが使用されてきた。 As N or Bluetooth antenna, a microstrip antenna or an inverted F-type antennas have been used. 【0003】図10はマイクロストリップアンテナの基本構成を示す平面図、およびそのA−A断面図である。 [0003] FIG. 10 is a plan view, and its A-A sectional view showing a basic configuration of a microstrip antenna.
図10において、101は放射導体、102は誘電基体、103は接地導体である。 10, 101 radiation conductor, 102 is a dielectric substrate, 103 denotes a ground conductor. 接地導体103上に誘電基体102が載置され、さらに誘電基体102上に放射導体101がエッチング等により形成される。 Dielectric substrate 102 is placed on the ground conductor 103, radiation conductor 101 is formed by etching or the like to further dielectric substrate 102. そして、 And,
放射導体101上の入力インピーダンスが給電点系のインピーダンスと等しくなる位置に、給電点104として設けられる。 A position input impedance on the radiation conductor 101 is equal to the impedance of the feeding point system is provided as a feeding point 104. 【0004】また、図11は片側短絡マイクロストリップアンテナの構成を示す平面図と、そのB−B断面図である。 [0004] Figure 11 is a plan view showing the structure of a one-sided short microstrip antenna is its sectional view taken along line B-B. 片側短絡マイクロストリップアンテナは、上述のマイクロストリップアンテナにおける放射導体101の零電位面を、短絡導体105により、接地導体103と短絡させるようにしたものである。 One short microstrip antenna, the zero potential plane of the radiation conductor 101 in the microstrip antenna described above, the short-circuit conductor 105, is obtained so as to short-circuit the grounding conductor 103. このようにすると、 In this way,
同一共振周波数で作動するにも拘わらず、その放射導体長さの1/2とすることができる。 Despite operating at the same resonant frequency, it can be reduced to half of its radiation conductor length. 【0005】次に、図12は板状逆Fアンテナの構成を示す平面図と、そのC−C断面図である。 [0005] Next, FIG 12 is a plan view showing a structure of a planar inverted F antenna is its sectional view taken along line C-C. 板状逆Fアンテナは、短絡導体105の幅Wsを放射導体101の幅Wbより小さくすることにより、共振周波数が低下するため小型化が可能である。 Planar inverted F antenna, by less than the width Wb of the radiation conductor 101 width Ws of the short-circuit conductor 105, it is possible to miniaturize the resonant frequency is decreased. また、短絡導体105の中心の放射導体中心線からのオフセット量については、放射導体端部の端に設定した方が共振周波数を下げ、小型化に有利である。 Also, the offset amount from the radiating conductor centerline of the center of the short-circuit conductor 105, want to set the edge of the radiating conductor ends lowers the resonance frequency, which is advantageous for miniaturization. 【0006】 【発明が解決しようとする課題】さて、従来使用されてきた無線LANシステムあるいはブルートゥース用アンテナには、次のような技術課題がある。 [0006] The present invention is to provide a way, the conventionally used in have wireless LAN system or a Bluetooth antenna, there is a technical problem as follows. 即ち、実装上の問題と指向特性や帯域幅等に関する特性上の課題である。 That is the subject of the nature Issues and directional characteristics and bandwidth, etc. in mounting. 図10〜図12に示すように従来のアンテナは、給電点104が放射導体101の内側に位置する。 Conventional antenna as shown in FIGS. 10-12, the feed point 104 is located inside the radiating conductor 101. これはインピーダンスの整合が図示の位置でしか得られず、この点以外ではインピーダンスが不整合となるため、とられる措置である。 This can not be obtained only at the location of the impedance matching is illustrated, in other points the impedance is mismatched, a measure taken. 図には示していないが、給電には同軸ケーブルが使用され、接地導体103の背面から同軸ケーブルの中心導体が挿入される。 Although not shown, the feeding coaxial cable is used, the center conductor of the coaxial cable is inserted from the back of the ground conductor 103. このため、実装時にはアンテナの固定、同軸ケーブルの挿入および放射導体との接続固定など組立作業工程が多くなり、且つ作業に習熟する必要があった。 Therefore, at the time of mounting of the antenna fixed, inserted and connected and fixed such assembly work steps and the radiation conductor of the coaxial cable is increased, there is and should be familiar with the work. 一方、同軸ケーブルを使用しない実装方法もあるが、この場合は給電点に整合回路等を挿入するため大型で複雑なアンテナ装置となり、無線LA On the other hand, there is a mounting method without using coaxial cable, in this case becomes complicated antenna device large for inserting a matching circuit or the like to a feeding point, wireless LA
Nシステムには適合できない。 It can not be compatible with N system. 【0007】指向性に関しては、次のような課題がある。 [0007] With respect to the directivity, it has the following problems. 例えば、携帯電話等のモバイル機器間では、機器間の相対姿勢に依存しない無指向性なアンテナが望ましい。 For example, between mobile devices such as mobile phones, omnidirectional antenna which does not depend on the relative orientation between devices is desired. これに対し、オフィス内などで天井基地局を介してOA機器間の交信を行うシステムでは、各OA機器の机上における方向が制限されないように、水平面内に無指向性をもつアンテナが適している。 In contrast, in the system that performs communication between OA equipment such as the office through the ceiling base station, so that the direction of the desk of each OA apparatus is not limited, is suitable antenna with omnidirectional in a horizontal plane . 一方、各OA機器と天井基地局間で安定な通信を行うためには、水平面に対して天井方向に指向性をもつアンテナが好適である。 Meanwhile, in order to perform stable communication between the OA equipment and the ceiling base station, it is preferable antenna having directivity in a ceiling direction with respect to the horizontal plane. 障害物あるいは天井基地局等を考慮すると、水平面に対し45度方向の指向性を付与することが、ニーズに最も適うと考えられる。 In view of the obstacle or ceiling base station or the like, to impart 45 ° directivity with respect to the horizontal plane, considered to be the most meet the needs. しかし、従来のマイクロストリップアンテナや逆Fアンテナでは、以上述べた指向性については何ら配慮されていないか、不充分な特性しか備わっていなかった。 However, in the conventional microstrip antenna or inverted F antenna, for the above-mentioned directivity it was not any either not care, provided only insufficient characteristics. 【0008】さらに、高周波化により帯域幅が狭まるという問題がある。 Furthermore, there is a problem that the bandwidth is narrowed by the high frequency. 従来のアンテナでは給電点における入力インピーダンスが低くなるため、その対策として容量結合による給電方式がとられてきた。 Since the input impedance at the feeding point is low in the conventional antenna, feeding method by capacitive coupling as a countermeasure has been taken. しかし、この給電方式は直列の静電容量分が、周波数の増加と共に増加するため帯域幅が狭くなる。 However, the feeding system is a series of electrostatic capacity of the bandwidth to increase with increasing frequency is narrowed. 特に、5GHz以上の高周波域では、必要とされる帯域幅の確保が難しくなることが予測される。 In particular, in the 5GHz and above the high-frequency region, it is expected to be difficult to secure the bandwidth that is required. 本発明の目的は、このような従来の問題点を解決して、小型で高性能な表面実装型アンテナと、それを搭載するのに適切なアンテナ装置を提供するものである。 An object of the present invention, such to solve the conventional problems, is to provide a high performance surface mount antenna with small size, a suitable antenna device for mounting it. 【0009】 【課題を解決するための手段】上述した問題点を解決するため従来のマイクロストリップアンテナの構成をベースにして、放射電極が主放射電極と副放射電極からなる全く新しい構成のアンテナを案出した。 [0009] [Means for Solving the Problems] was based a configuration of a conventional microstrip antenna for solving the above problems, an entirely new structure of an antenna in which the radiation electrode consisting of the main radiation electrode and the auxiliary radiation electrode It was devised. 以下、請求項ごとに解決手段と特徴について詳述する。 Described in detail below solves means and wherein each claim. 請求項1に記載の発明は、誘電性もしくは磁性の基体に放射電極を配置する表面実装型アンテナにおいて、前記放射電極は主および副放射電極からなり、上記放射電極間は接続導体によって導通がとられることを特徴とする表面実装型アンテナである。 According to one aspect of the present invention, the surface mount antenna to place the emitting electrode to the dielectric or substrate of the magnetic, the radiation electrode is made of primary and secondary radiation electrode, is between the radiation electrode is conducted by connecting conductors preparative a surface mount antenna characterized in that it is. 従来、複数の放射電極をもつアンテナとしては、複共振を目的とするアンテナによく見られる構成である。 As a conventional antenna with a plurality of radiation electrodes is a prevalent configuration antennas intended for multi-resonance. 複共振アンテナでは、それぞれの周波数に適合する共振回路を備え、且つ他の共振回路からの影響を受けないように構成される。 The multiple resonance antenna, the respective frequency comprises a matching resonant circuit, and configured so that it is not affected by the other resonant circuit. このため、複数ある放射電極は相互には接続されず、放射電極を含めた共振回路をそれぞれ独立に構成し、一箇所に寄せ集める方法が一般的にとられる。 Therefore, the plurality of radiation electrodes not connected to each other, the resonant circuit including the radiating electrodes configured independently method gather in one place is taken generally. しかし、本発明のアンテナは、主および副放射電極が恰も一つの電極であるが如く動作することを旨とするもので、指向特性および帯域幅の改善を図るために主および副放射電極を設けて、両電極を接続導体で接合する方法を新たに見出した。 However, the antenna of the present invention, which primary and secondary radiation electrode and purport to operate as if it were one of the electrodes is provided with primary and secondary radiation electrode in order to improve the directional characteristics and bandwidth Te, newly found a method of joining the two electrode connection conductor. 【0010】放射電極を2分割することは、単一の放射電極を備える場合よりはるかに多くの特性上の選択肢を与えるばかりか、制約条件を取り除くことが可能となる。 [0010] To 2 dividing the radiation electrode, not only given the option on many more properties than with a single radiation electrode, it is possible to remove the constraint. 例えば、パッチアンテナや逆Fアンテナは放射電極と地導体の相対関係で指向性が決まってしまう。 For example, a patch antenna or inverted F antenna is thus decided directivity in a relative relationship between the radiation electrode and the ground conductor. ここに、第2の電極として副放射電極を持ち込むと全く異なった状態が得られる。 Here, the sub-radiation electrode completely different when brought state is obtained as a second electrode. 電界および磁流の分布パターンは放射電極と地導体の位置あるいは形状で決まり、アンテナの構成でほぼ固定される。 Distribution pattern of the electric field and magnetic current is determined by the position or shape of the radiation electrode and the ground conductor, it is substantially fixed in the configuration of the antenna. 副放射電極の導入は、この固定化された電界あるいは磁流パターンを部分的に変更制御できる可能性を与えるもので、表面実装型アンテナに新規な特性が期待できる。 The introduction of secondary radiation electrode, the immobilized electric or magnetic current pattern intended to give the possibility to partly change control can be expected novel properties to the surface-mount antenna. 【0011】請求項2に記載の発明は、主放射電極11 [0011] According to a second aspect of the invention, the main radiation electrode 11
と副放射電極13とは基体を介して対向させると共に、 And with the secondary radiation electrode 13 are opposed through the substrate,
主もしくは副放射電極と前記接続導体15との接合部のいずれかに給電することを特徴とする表面実装型アンテナである。 A surface mount antenna, which comprises feeding to any of the joint between the connecting conductor 15 to the main or auxiliary radiation electrode. 主放射電極と副放射電極を対向させる目的は、効率の良い共振回路を得るためである。 Purpose of opposing the main radiation electrode and the auxiliary radiating electrode is to obtain a good resonant circuit efficiency. 最も効率よくアンテナが動作するには、平行配置に近い場合が好ましい。 The most efficient antenna operates is preferably is close to parallel arrangement. しかしながら、両電極が対向していれば本発明の効果が得られることは言うまでもない。 However, it is needless to say that the effect of the present invention if both electrodes if opposite is obtained. また、放射電極の対向は少なくとも一部が対向していればよく、全面に亘って対向する必要はない。 The counter of the radiation electrode may if at least partially opposed, there is no need to face over the entire surface. また、両面の交差角は0〜 In addition, both sides of the crossing angle 0
90度が好ましいが、基体の面構成に依存することを考慮すると、90度以上の場合も実施可能である。 Preferably 90 times, considering that depends on the surface structure of the substrate can be implemented in the case of more than 90 degrees. 【0012】また、本発明の後段は放射電極と接続導体との接合部を広い意味での給電点とする給電方法である。 Moreover, later in this invention is a power supply method of the feeding point in a broad sense the joint between the connection and the radiation electrode conductor. 前段の電極配置方法とセットになって初めて発明の効果が得られる。 It was not until in front of the electrode arrangement and loading effects of the invention can be obtained. 前述の接合部は工作上好適であるばかりでなく、信頼性を確保する上で是非必要な条件を備えている。 Junction above is not only suitable on work, and a come necessary condition for ensuring reliability. 表面実装型のチップアンテナでは給電構造のコンパクト化が強く要求されるが、本発明はその目的に適う方法で、回路基板上での給電が可能である。 Although the surface mount type chip antenna compact is strongly required of the feed structure, the present invention is a method that meets its purpose, it is possible to feed on the circuit board. 【0013】さて、図1は本発明によるアンテナの基本要素とその動作を説明する原理図である。 [0013] Now, FIG. 1 is a principle diagram illustrating the basic elements of the antenna and its operation according to the present invention. 図中10は本発明による表面実装型アンテナであり、各電極の配置と接合状態が分かるように基体を省略して示した。 Figure 10 is a surface mount antenna according to the present invention, shown by omitting the substrate so arranged and the joint state is found for each electrode. 表面実装型アンテナ10は地導体17上に所要の間隙をもって配置される。 A surface-mounted antenna 10 is disposed with a predetermined gap on the ground conductor 17. 放射電極は主放射電極11および副放射電極13とからなり、両電極は側面に配置される接続導体15によって接合され導通を得ている。 Radiation electrode consists mainly radiating electrode 11 and the sub-radiating electrode 13. Both electrodes are obtained conduction joined by a connecting conductor 15 disposed on the side surface. しかし、この構成は従来のマイクロストリップアンテナとは基本的に異なる。 However, this arrangement is fundamentally different from the conventional microstrip antenna. 従来のマイクロストリップアンテナでは、放射電極が地導体と必ず平行に対向配置される。 In a conventional microstrip antenna, the radiation electrode is always facing each with the ground conductor. これは放射電極と地導体間の静電容量を利用した共振回路を形成するためである。 This is to form a resonant circuit utilizing a capacitance between the radiation electrode and the ground conductor. したがって、共振電流は放射電極と地導体間を往復する。 Accordingly, the resonant current back and forth between the radiation electrode and the ground conductor. 【0014】しかし、本発明では共振電流iの分布が相違する。 [0014] However, in the present invention differs from the distribution of the resonant current i. iの大部分は、図中の矢印で示すように接続導体15を通過して主放射電極11と副放射電極13に流れる。 Most of the i passes through the connecting conductor 15, as shown by the arrow in FIG main radiation electrode 11 flows through the secondary radiation electrode 13. 一部は地導体17側に分流するが、特性に影響する程ではない。 Some shunted to the ground conductor 17 side, but not enough to affect the properties. 即ち、本発明のアンテナの共振回路は主放射電極11と副放射電極13間で形成される。 That is, the resonant circuit of the antenna of the present invention is formed between the main radiation electrode 11 and the sub-radiating electrode 13. 言い換えると、主および副放射電極の幅の和であるa+bが、 In other words, the sum of the widths of the primary and secondary radiation electrode a + b is,
波長/4の関係を持つことになる。 It will have a relationship of wavelength / 4. 一方、放射電極長さcはa+bに近い値が好ましい。 On the other hand, the radiation electrode length c is preferably a value close to a + b. また、aおよびbを等しいか近い値とすれば、アンテナをほぼ半分の大きさにすることができる。 Also, if equal to or close values ​​of a and b, can be sized approximately half antenna. 【0015】さらに、図1に示すように副放射電極13 Furthermore, as shown in FIG. 1 sub radiating electrode 13
は地導体17の上方に所要のギャップ間隔を保って置かれる。 They are placed while maintaining a predetermined gap distance above the ground conductor 17. この配置によってインピーダンス整合作用が得られるため、整合回路を省略できる。 Since the impedance matching effect can be obtained by this arrangement, it can be omitted matching circuit. 従来の表面実装型アンテナは、インピーダンスが整合する位置に給電するか、整合回路を挿入する方法であったが、本発明はインピーダンス整合を地導体と放射電極の配置関係で得ることを特徴とするもので、このようなインピーダンス整合方法を開示または教示する文献は見当たらない。 Conventional surface mount antenna, or impedance to power at positions matching, but a method of inserting a matching circuit, the present invention is characterized by obtaining impedance matching arrangement of the ground conductor and the radiation electrode those in the literature which discloses or teaches such impedance matching method is not missing. 【0016】また、請求項3には接続導体を略台形状に規定することを特徴とする表面実装型アンテナの発明である。 Further, in claim 3 is the invention of a surface mount antenna characterized by defining a connection conductor to the substantially trapezoidal. 略台形状の接続導体は、帯域幅を広げる効果がある。 Connecting conductors of substantially trapezoidal shape has the effect of widening the bandwidth. 後述するように、台形比(上辺長さ/下辺長さ)が増加すると、ほぼ比例して帯域幅が広がることを見出した。 As described later, the trapezoid ratio (upper side length / lower side length) is increased, it was found that spreading bandwidth substantially in proportion. これは主放射電極と副放射電極間で形成される浮遊容量が関係するが、台形斜辺の形状による影響は余りなく、寧ろ、上辺と下辺の長さに依存するようである。 The main radiation electrode and the stray capacitance formed between the secondary radiation electrode is concerned, but rather much affected by the shape of the trapezoidal oblique sides, rather, it appears to be dependent on the length of the upper and lower sides. 【0017】次に、請求項4の発明は前述のアンテナを搭載してアンテナ装置を構成する場合、本発明の効果を十分引き出すことができる構成である。 Next, the invention of claim 4 when composing the mounting to the antenna device the above antenna, a structure that can elicit the effects of the present invention sufficiently. 即ち、地導体と協働して高周波の電波を送受信するアンテナ装置において、請求項1〜3のいずれかの表面実装型アンテナを、 That is, in the antenna device for transmitting and receiving radio waves of high frequency in cooperation with the ground conductor, one of the surface mount antenna of claim 1,
その放射電極が前記地導体面に平行に、且つ所要の距離をもって設置することを特徴とするアンテナ装置である。 As the radiation electrode is parallel to the ground conductor surface, a and antenna apparatus characterized by placing with the required distance. 文言上、放射電極の地導体に対する平行および離隔距離の設定を規定するが、従来の表面実装型アンテナ程度に、放射電極が地導体に接触もしくは近接するものでない。 Literally, but to define the set of parallel and spaced a distance with respect to the ground conductor of the radiation electrode, the order of conventional surface-mount antenna, not intended radiation electrode is in contact or close to the ground conductor. 【0018】請求項5の発明は、地導体基板上に設けたストリップラインを用いてアンテナに給電することを特徴とする方法である。 [0018] The invention of claim 5 is a method characterized by feeding to the antenna using a strip line provided on the ground conductor on the substrate. 接続導体と主放射電極もしくは副放射電極との接合部を給電点とすることによって、同軸ケーブルを使用しなくても給電することが可能である。 By the junction of the connecting conductor and the main radiation electrode or the sub-radiation electrode and the feeding point, it is possible to feed even without using coaxial cable.
さらに、組立実装が大幅に簡単化される。 Furthermore, the assembly implementation is greatly simplified. しかし、インピーダンス整合が可能な箇所は無数あるわけでなく、後述するように一定の要件を満たす、極限られた箇所に限定される。 However, portions that can be impedance matching is not necessarily certain myriad satisfy certain requirements as described below, is limited to locations with limited poles. 本発明の給電点は、インピーダンス整合する場所ではなく、実装上の要請によるものである。 Feeding point of the present invention is not a place where impedance matching is requested by such an implementation. 【0019】請求項6の発明は、請求項4に関係するアンテナ装置であり、両面が導体で蔽われた地導体基板の表面をアンテナの大きさより広いスペースで地導体を取り除き、このスペースにアンテナを設置することを特徴とするアンテナ装置である。 [0019] The invention of claim 6 is an antenna device related to claim 4, the surface of the ground conductor substrate having both surfaces covered with a conductor removed ground conductor in wide space than the size of the antenna, the antenna in the space an antenna apparatus characterized by installing. この発明の趣旨は、表面実装型アンテナを直接地導体面上に設置するよりは、地導体から所要の距離を空けて置いた方が、アンテナ本来の特性が容易に得られるからである。 Spirit of the invention, rather than installing a surface mount antenna on a direct ground conductor surface, who placed at a predetermined distance from the ground conductor, because inherent properties antenna can be easily obtained. 好適な距離については、実施例で詳しく述べることにする。 The preferred distance will be described in detail in the Examples. 【0020】請求項7は給電方法の発明である。 [0020] Claim 7 is the invention of the power supply method. 前記地導体基板上に形成されたストリップラインを接続導体と放射電極の接合部に接続し、このストリップラインと地導体との相対位置関係によってインピーダンス整合を得る方法を特徴とするアンテナ装置である。 Connect the strip line formed on the ground conductor on the substrate at the junction of the connecting conductor and the radiation electrode is an antenna device that features a method for obtaining an impedance matching the relative positional relationship between the stripline and the ground conductor. この方法によってインピーダンス整合回路の挿入が不用となり、簡単な構成で実用的な表面実装型アンテナが得られる。 This method is the insertion of the impedance matching circuit becomes unnecessary, practical surface-mounted antenna can be obtained with a simple configuration. 前述したように、本発明のアンテナの給電点は放射電極と接続導体との接合部であるが、この接合部からみた入力インピーダンスは低いため、電圧波の反射が大きくインピーダンス整合の必要がある。 As described above, the feeding point of the antenna of the present invention is a joint between the connection and the radiation electrode conductor, since the input impedance seen from the junction is low, there is a need for reflection is large impedance matching voltage wave. 本発明は、整合回路を用いることなくこの問題に解決を与える方法である。 The present invention is a method of providing a solution to this problem without using the matching circuit. 【0021】請求項8は、アンテナ装置としての指向特性に関する発明である。 [0021] Claim 8 is the invention relates to directional characteristics of the antenna device. 即ち、請求項4〜7のいずれかに記載のアンテナ装置は、いずれも接地導体面にほぼ4 That is, the antenna device according to any one of claims 4 to 7 are all approximately the ground conductor surface 4
5度の方向に指向特性を有すると共に、地導体に平行な面内は無指向性の特徴を有する。 Which has a 5-degree direction to the directional characteristics of plane parallel to the ground conductor is characterized omnidirectional. 今までの無線LAN用アンテナでは、このような特性が考慮されていなかったが、本発明によって従来得られなかった指向特性をもつアンテナを提供できる。 The wireless LAN antenna until now, but this characteristic has not been considered possible to provide the antenna having a directional characteristic which can not be obtained conventionally by the present invention. 【0022】以上説明した本発明の表面実装型アンテナは、指向性および帯域特性を改善できるばかりか、アンテナの小型化にも貢献できる。 The surface-mounted antenna of the present invention described above, not only can improve the directivity and bandwidth characteristics, can contribute to the miniaturization of the antenna. また、従来のマイクロストリップアンテナの基体は通常扁平であるが、四角柱の基体を用いて本発明のように主放射電極と副放射電極を配置すれば、所定の方向に強い指向性を持ち、且つ小型のアンテナを製造することができる。 Although the substrate of a conventional microstrip antenna is usually flat, by arranging the main radiation electrode and the auxiliary radiation electrode as in the present invention by using a substrate of square pillar, it has a strong directivity in a predetermined direction, and it is possible to produce a small antenna. これは主放射電極と副放射電極間の電気力線あるいは磁流の分布を考えれば、容易に理解されるところである。 This Considering electric flux lines or distribution of magnetic current between the main radiation electrode and the sub emission electrode is about to be readily understood. 【0023】 【発明の実施の形態】次に、実施例について説明する。 DETAILED DESCRIPTION OF THE INVENTION Next, a description will be given of an embodiment.
図2は本発明による表面実装型アンテナを両面に地導体を配した基板上に搭載した斜視図である。 Figure 2 is a perspective view mounted on a substrate a surface-mounted antenna according to the present invention arranged the earth conductor on both sides. 図示するように本発明の表面実装型アンテナ10は、地導体17を除去して絶縁層27を露出させたスペースに搭載される。 Surface-mounted antenna 10 of the way the present invention shown is mounted in the space to expose the insulating layer 27 by removing the ground conductor 17.
このスペースは表面実装型アンテナ10より広く、後述する大きさに加工された地導体基板が使用される。 This space wider than a surface-mounted antenna 10, the ground conductor substrate which is processed to a size to be described later is used. また、表面実装型アンテナ10の裏面は地導体が配置されるため、副放射電極13は絶縁層27を介して背面の地導体に対向する。 Further, since the back surface of the surface mount antenna 10, which is disposed the ground conductor, the sub-radiating electrode 13 is opposed to the ground conductor on the back through the insulating layer 27. これにより、副放射電極13は地導体と所要のギャップ間隔で離されたことになる。 Thus, the sub-radiating electrode 13 will be is released at the required gap distance between the ground conductor. 【0024】表面実装型アンテナへの給電は、地導体基板の中央に設けたストリップライン23を使用する。 The power supply to the surface mount antenna uses a strip line 23 provided at the center of the ground conductor substrate. ストリップライン23を副放射電極13と接続導体15の接合部まで延伸し接続する方法であるため、地導体基板上の所定の位置に表面実装型アンテナを固着した後、はんだ付け等で導通をとれば給電回路を形成できる。 Since the strip line 23 is a method of stretching connected to the junction of the secondary radiation electrode 13 and the connecting conductor 15, after fixing a surface mount antenna in a predetermined position on the ground conductor substrate, take the conduction soldering It can form a field supply circuit. 従来の給電方法は、同軸ケーブルを用いて基板等に貫通孔を設ける方法であったため、地導体基板の構造が複雑化し、組立調整に多くの時間を要していた。 Conventional feeding method, because it was a method of providing a through hole in the substrate or the like by using a coaxial cable, the structure of the ground conductor substrate is complicated, it takes much time to assemble adjustment. しかし、本発明の表面実装型アンテナではそのようなことはなく、迅速確実にアンテナを基板に搭載することができ、更に強固な接続が可能となるため信頼性の高いアンテナ装置を提供できる。 However, the surface-mounted antenna of the present invention no such thing, quickly reliably antennas can be mounted on the substrate, it can further provide high antenna device reliability since it becomes possible firm connection. 因みに、図中に示すD 、D およびW Incidentally, D 1, D 2 and W 4 shown in FIG.
は1mmである。 It is 1mm. 地導体基板は厚さが0.6mmで、両面の地導体用の銅板は数10μmである。 Ground conductor substrate thickness at 0.6 mm, the copper plate for both sides of the ground conductor is several 10 [mu] m. 【0025】また、主放射電極11は奥側面まで延びる延長部29を有しており、この延長部29は共振周波数の調整用に利用できる導体部である。 Further, the main radiation electrode 11 has an extension 29 which extends to the back side, the extension 29 is a conductor portion which can be utilized for adjustment of the resonance frequency. この延長部29を適当にトリミング等の加工により、主放射電極と副放射電極間の静電容量が調整でき、共振周波数の微調整が可能である。 The process suitably trimming etc. The extension 29 can capacitance adjustment between the main radiation electrode and the sub emission electrode, it is possible to finely adjust the resonant frequency. また、延長部29はアンテナの放射特性等に影響を及ぼさない程度に配置されるが、必要に応じて形成すべきものである。 Further, the extension portion 29 is being located so as not to affect the radiation characteristics of the antenna such as those to be formed if necessary. 【0026】図3(a)に本発明による表面実装型アンテナの等価回路を示す。 [0026] An equivalent circuit of the surface-mounted antenna according to the present invention in FIG. 3 (a). また、比較のため従来の場合も同図(b)に示す。 Also, in the conventional for comparison shown in FIG. (B). 従来の場合と比べると、コンデンサC ,C およびインダクタンスL が新たに加わり、 Compared with the conventional case, the capacitor C 2, C 3 and the inductance L 3 is applied to the new,
図示のように結線される。 It is connected as shown. C ,C およびL は図2 2, C 3 and L 3 is 2
中に示す部分を等価的に置き換えたものである。 Is replaced equivalently a portion indicated in. なお、 It should be noted that,
=L 11 +L 12 +L 13 、C ≫C またC L 1 = L 11 + L 12 + L 13, C 1 »C 2 The C 3 »
の関係がある。 A relationship of C 2. インピーダンス整合はC ,C およびL の値を適宜選択するによって可能となるが、特にC の選択が重要である。 Impedance matching is made possible by appropriately selecting the values of C 2, C 3 and L 3, it is important particularly selective for C 3. 一方、上記の関係のためC Meanwhile, C for the above relationship
,C およびL による共振周波数に対する影響は小さく、共振周波数とはほぼ独立にインピーダンス整合を行うことができる。 2, C 3 and L 3 smaller influence on the resonance frequency due to, it is possible to perform substantially independently of the impedance matching and the resonant frequency. 【0027】試料として、長さ6mm、幅3mm、厚さ3mmの表面実装型アンテナを、縦30mm、横20mm、厚さ0.6mmのプリント基板に実装し評価した。 [0027] As a sample, the length 6 mm, width 3 mm, the surface-mounted antenna having a thickness of 3 mm, vertical 30 mm, lateral 20 mm, was mounted on a printed substrate having a thickness of 0.6mm evaluation. このとき、基板の部品実装面において開発品以外の領域には、すべて接地導体パターンを配置すると共に、基板上辺部のアンテナ試料と下辺部の同軸コネクタ間を、ストリップラインで結合する構造とした。 At this time, the region other than the developed product in the component mounting surface of the substrate, all with placing the grounding conductor pattern, the inter-coaxial connector of the antenna sample and the lower side portion of the substrate upper side, has a structure that binds a strip line. このアンテナ試料について、同軸ケーブルの他端にネットワークアナライザなどの測定機を接続し、VSWRと利得(放射指向性)をそれぞれ測定した。 This antenna sample, connect the measuring instrument, such as a network analyzer to the other end of the coaxial cable was measured VSWR and gain (the radiation directivity) respectively. ここで、VSWR(Voltage Standing Wave Ratio: Here, VSWR (Voltage Standing Wave Ratio:
電圧定在波比)とは、入射波と反射波が同相と逆位相にある場合の定在波電圧の比Vmax/Vminで定義される値で、インピーダンス整合状態の指標として用いられる。 Voltage The standing wave ratio), a value defined by the ratio Vmax / Vmin of the standing wave voltage when the reflected wave and the incident wave is in phase and opposite phase, is used as an indicator of the impedance matching state. 【0028】本測定では、シールドルーム内壁に電波吸収体が隙間なく敷設された電波暗室を利用した。 [0028] In this measurement, the radio wave absorber to shield room inner wall using the anechoic chamber that has been laid without a gap. ターンテーブル上で回転するアンテナ試料から電波を送信し、 And transmitting a radio wave from antenna sample rotating on a turntable,
このうち直接波のみホーンアンテナで受信する構成であり、得られた受信電力をもとに利得および放射指向性を求めた。 Among a configuration for receiving only the direct wave horn antenna, based on the received power obtained was determined gain and radiation pattern. プリント基板を図4および図5に、またその搭載方法を図6に示す。 The printed circuit board 4 and 5, also showing the mounting method in Fig. 【0029】図7は指向特性の測定結果である。 FIG. 7 is a measurement result of the directional characteristic. 同図(a)はY−Z面、即ち図6に示すように地導体25面に垂直な面内において、45度方向付近にも高い感度が現れていることがわかる。 FIG (a) is Y-Z plane, i.e. in a plane perpendicular to the ground conductor 25 side as shown in FIG. 6, it can be seen that appearing high sensitivity in the vicinity of 45 degrees direction. 同様に、(b)は地導体25 Similarly, (b) the ground conductor 25
に平行なX−Zに関する指向性で、完全な円に見える程度に無指向化されている。 Are non-directional to the extent in directivity, it appears to complete circle about the parallel X-Z in. なお、試作したアンテナ試料は5GHz帯無線LAN用を目的に開発したものであり、 It should be noted that the prototype antenna sample is obtained by developed for the purpose of for 5GHz band wireless LAN,
米国、欧州、日本などで使用可能となる場合を想定して試作したものである。 The United States, Europe, one in which the case that become available was fabricated assumed in such as Japan. 【0030】図8は、試作アンテナの周波数特性である。 [0030] FIG. 8 is a frequency characteristic of the prototype antenna. 共振周波数5.2GHzを中心に帯域幅123MHzが得られ、実用に十分耐える特性である。 Bandwidth 123MHz is obtained around the resonance frequency 5.2 GHz, which is enough to withstand characteristics for practical use. また、図9は接続導体の形状を検討する際に用いた特性カーブである。 Further, FIG. 9 is a characteristic curve used when considering the shape of the connection conductor. 各種の形状をシミュレーションしたが、台形状に集約することができることがわかった。 Simulating various shapes, but it was found that can be aggregated into a trapezoidal shape. 今回は、中心周波数と比帯域との兼ね合いから、台形比=2を採用した。 This time, the balance of the center frequency and the fractional bandwidth was adopted trapezoid ratio = 2. 【0031】 【発明の効果】本発明によって、ブルートゥースや無線LAN用として、従来問題となっていた表面実装型アンテナの実装上の問題が解決されると共に、指向性および帯域特性が改善される。 By [0031] the present invention, as a Bluetooth or a wireless LAN, along with implementation issues of the conventional problems and is to have a surface-mounted antenna is resolved, directivity and bandwidth characteristics are improved.

【図面の簡単な説明】 【図1】本発明の原理図である。 It illustrates the principle of an BRIEF DESCRIPTION OF THE DRAWINGS [Figure 1] present invention. 【図2】本発明による表面実装型アンテナの基板搭載斜視図である。 Figure 2 is a substrate mounted perspective view of the surface mount antenna according to the invention. 【図3】表面実装型アンテナの等価回路である。 3 is an equivalent circuit of the surface mount antenna. 【図4】地導体基板とアンテナ搭載図である。 [4] ground conductor substrate and an antenna mounting diagram. 【図5】地導体基板の表面図である。 5 is a top plan view of a ground conductor substrate. 【図6】指向性測定の概略方法である。 6 is a schematic method of directional measurement. 【図7】指向性の測定結果である。 7 is a measurement result of the directivity. 【図8】VSWRの周波数特性である。 FIG. 8 is a frequency characteristic of the VSWR. 【図9】接続導体の台形比と比帯域特性である。 9 is a trapezoid ratio and fractional bandwidth characteristics of the connection conductor. 【図10】従来のストリップラインアンテナの平面図である。 10 is a plan view of a conventional stripline antenna. 【図11】従来の片側短絡マイクロストリップアンテナの平面図である。 11 is a plan view of a conventional one-sided short microstrip antenna. 【図12】従来の板状逆Fアンテナの平面図である。 12 is a plan view of a conventional planar inverted F antenna. 【符号の説明】 10:(表面実装型)アンテナ、11:主放射電極、1 [Description of reference numerals] 10 :( surface mount) antenna, 11: main radiation electrode, 1
3:副放射電極、15:接続導体、17:地導体、1 3: secondary radiation electrode, 15: connection conductor, 17: ground conductor, 1
9:信号源、21:基体、23:ストリップライン、2 9: a signal source, 21: substrate, 23: stripline, 2
5:地導体、27:絶縁層、29:延長部、31:同軸コネクタ、33:スルーホール、101:放射導体、1 5: the ground conductor, 27: insulating layer, 29: extension 31: coaxial connector, 33: through hole, 101: radiation conductor, 1
02:誘電基体、103:接地導体、104:給電点、 02: dielectric substrate, 103: ground conductor, 104: feed point,
105:短絡導体 105: short-circuit conductor

───────────────────────────────────────────────────── フロントページの続き (72)発明者 萩原 英俊 鳥取県鳥取市南栄町70番地2号 日立金属 株式会社鳥取工場内Fターム(参考) 5J045 AA01 AA21 AB05 AB06 DA08 EA07 HA06 NA01 5J046 AA04 AA07 AB13 PA07 ────────────────────────────────────────────────── ─── front page of the continuation (72) inventor Hidetoshi Hagiwara Tottori Prefecture Tottori Nan'ei-cho, 70 address No. 2 Hitachi Metals Co., Ltd. Tottori factory in the F-term (reference) 5J045 AA01 AA21 AB05 AB06 DA08 EA07 HA06 NA01 5J046 AA04 AA07 AB13 PA07

Claims (1)

  1. 【特許請求の範囲】 【請求項1】 誘電性もしくは磁性の基体に放射電極を配置する表面実装型アンテナにおいて、前記放射電極は接続導体によって互いに接合された主および副放射電極からなることを特徴とする表面実装型アンテナ。 All Claims 1. A surface mount antenna to place the emitting electrode to the dielectric or substrate of the magnetic, the radiation electrode is characterized in that it consists of primary and secondary radiation electrode joined to one another by connecting conductors surface-mount antenna to be. 【請求項2】 請求項1において、前記主および副放射電極は前記基体を介して対向すると共に、前記接続導体との接合部が給電点であることを特徴とする表面実装型アンテナ。 2. A method according to claim 1, wherein the primary and with secondary radiation electrode faces through said substrate, a surface mount antenna, wherein the junction between the connection conductor is a feeding point. 【請求項3】 請求項1または2のいずれかにおいて、 3. The claim 1 or 2,
    前記接続導体は略台形状であることを特徴とする表面実装型アンテナ。 Surface mount antenna, wherein the connection conductor is a substantially trapezoidal shape. 【請求項4】 表面実装型アンテナを両面地導体基板に搭載するアンテナ装置において、請求項1〜3のいずれかに記載の表面実装型アンテナを地導体から所要の距離をもって配設することを特徴とするアンテナ装置。 4. A antenna apparatus for mounting a surface mount antenna on both sides ground conductor substrate, characterized in that arranged with the required distance of the surface mount antenna from the ground conductor according to claim 1 and the antenna device. 【請求項5】 請求項4において、前記地導体基板上にストリップラインを設け、該ストリップラインが主もしくは副放射電極と接続導体とのいずれかの接合部に接続されることを特徴とするアンテナ装置。 5. The method of claim 4, the antenna, characterized in that the ground conductor strip line provided on the substrate, the strip line is connected to one of the joint between the connecting conductors to the main or auxiliary radiation electrode apparatus. 【請求項6】 請求項4または5のいずれかにおいて、 6. The claim 4 or 5,
    少なくとも前記表面実装型アンテナは地導体基板の地導体上に直接搭載しないことを特徴とするアンテナ装置。 Antenna apparatus characterized in that at least the surface-mounted antenna is not mounted directly on the ground conductor of the ground conductor substrate. 【請求項7】 請求項4〜6のいずれかにおいて、前記ストリップラインと接合部間のインピーダンス整合は、 In any one of claims 7 claims 4 to 6, the impedance matching between the strip line and junction
    主放射電極、副放射電極または地導体間で形成される静電容量を適宜組み合わせることによって得られることを特徴とするアンテナ装置。 The main radiating electrode, the antenna device characterized in that it is obtained by combining the capacitance formed between the sub-radiation electrode or the ground conductor as appropriate. 【請求項8】 請求項4〜7のいずれかにおいて、前記地導体面にほぼ45度の方向に指向特性を有すると共に、地導体に平行な面内は無指向性であることを特徴とするアンテナ装置。 8. The claim 4-7, characterized in that which has a directivity in the direction of approximately 45 degrees to the ground conductor surface, the plane parallel to the ground conductor is a non-directional the antenna device.
JP2001294444A 2001-09-26 2001-09-26 Surface-mounting type antenna and antenna device mounting the same Pending JP2003110344A (en)

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