JP2005124061A - Loop antenna device - Google Patents

Loop antenna device Download PDF

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JP2005124061A
JP2005124061A JP2003359423A JP2003359423A JP2005124061A JP 2005124061 A JP2005124061 A JP 2005124061A JP 2003359423 A JP2003359423 A JP 2003359423A JP 2003359423 A JP2003359423 A JP 2003359423A JP 2005124061 A JP2005124061 A JP 2005124061A
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loop antenna
conductor
antenna device
dielectric substrate
loop
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JP4062233B2 (en
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Yoshihiko Takahashi
佳彦 高橋
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Toyota Motor Corp
トヨタ自動車株式会社
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Abstract

PROBLEM TO BE SOLVED: To provide a loop antenna device having almost no flat-face directivity or capable of setting desired flat-face directivity.
SOLUTION: The loop antenna device is composed of a dielectric substrate mounted on a conducting flat plate and an antenna element, which includes a conductor pattern formed on the substrate. Both ends of the conductor pattern are connected to the conducting flat plate and formed in a shape like a belt on the circumferential face of the dielectric substrate. The antenna element is composed of a conductor and the conductor pattern. One end of the conductor is connected to the conductor pattern and the other end of it is connected to a power feeding point on the conducting flat plate. In the antenna element, a pair of half-loop-shaped elements from the end connected to the conducting flat plate to the end of the conductor connected to the power feeding point has a symmetrical shape, and a dielectric substrate has a width wider than the belt-shaped conductor pattern at the circumferential face, where the belt-shaped conductor pattern is formed.
COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、概して、ループアンテナ装置に係り、特に、誘電体基体の表面上に形成された導電体パターンをアンテナ素子の一部として有するループアンテナ装置に関する。 The present invention relates generally to a loop antenna device, particularly to a loop antenna device having a conductive pattern formed on the surface of the dielectric substrate as a part of the antenna element.

従来、図1(a)に示すように、1周の長さが1波長(λ)に相当するループ状のアンテナ素子を2つ並べ、1点で給電するようにした、対称な一対のループから成るアンテナ素子とした双ループアンテナが知られている(例えば、特許文献1参照。)。 Conventionally, as shown in FIG. 1 (a), 1 lap two connected loop-shaped antenna element corresponding to one wavelength (lambda) in length, and so as to feed at one point, symmetrical pair of loops twin loop antenna with an antenna element made of is known (e.g., see Patent Document 1.).

双ループアンテナは、モノポールアンテナと比べて、高利得・広帯域なアンテナ特性が得られるという利点を有する。 Twin loop antenna has the advantage as compared with a monopole antenna, high gain and broadband antenna characteristic is obtained.

また、図1(b)に示すように、双ループアンテナを中心で半分に切り、地板(導電体平板)上に設けた双・半ループアンテナも知られている。 Further, as shown in FIG. 1 (b), cut in half at the center of the twin loop antenna, also known bi-half-loop antenna provided on the base plate (conductive flat plate). 単ループの場合と同様に、双・半ループアンテナでも、鏡像の原理より、実際の導電体部分とその電気影像部分とが相まって図1(a)に示す双ループアンテナと等価なアンテナとして機能する。 As in the case of single-loop, even bi-half-loop antenna, the principle of the mirror image, serves as an actual conductor portion and twin loop antenna equivalent to the antenna shown with its electrical imaging portion in combination FIGS. 1 (a) .
実開平2−86208号公報 Real Hei 2-86208 Patent Publication

図2(a)に示すように、双ループアンテナでは、共振時、アンテナ素子#1〜3に流れる電流が同相となる。 As shown in FIG. 2 (a), in the twin loop antenna, at resonance, the current flowing through the antenna element # 1 to 3 in phase. この双ループアンテナは、図2(b)に示すようなダイポールアンテナ3本に近似できる。 The twin loop antenna can be approximated to a dipole antenna three as shown in FIG. 2 (b). この状況において、各素子#1〜3からの電磁波は、Y方向では互いに強め合う関係にあり、X方向では互いに弱め合う関係にある。 In this situation, the electromagnetic wave from the elements # 1-3 are in relation to mutually reinforce in the Y direction, are in a relationship weaken each other in the X direction.

したがって、従来の双ループアンテナには、Y方向への放射が比較的強く、X方向への放射が比較的弱い、という特性があり、水平面(XY面)指向性はおよそ楕円の形状となる。 Therefore, the conventional twin loop antenna, radiation in the Y-direction is relatively strong, the radiation is relatively weak in the X direction, that has these characteristics, the horizontal plane (XY plane) directivity is approximately elliptical shape.

本発明はこのようなループアンテナ固有のアンテナ指向性を改善するためのものであり、水平面指向性が略無指向性である、又は、任意の水平面指向性を設定可能であるループアンテナ装置を提供することを主たる目的とする。 The present invention has been made to improve such loop antennas inherent antenna directivity is substantially omnidirectional horizontal plane directivity, or provide a loop antenna device can be set to any horizontal directional It is a main object of the present invention to.

上記目的を達成するための本発明の第一の態様は、導電体平板上に設置された誘電体基体と、該基体に形成された導電体パターンを含むアンテナ素子とを有するループアンテナ装置であって、上記導電体パターンは、両端部が導電体平板に接続され、上記誘電体基体の外周面上に帯状に形成され、上記アンテナ素子は上記誘電体基体内を通り、一端が導電体パターンに接続され、他端が導電体平板上の給電点に接続された導線と、上記導電体パターンとから構成され、導電体平板に接続された端部から給電点に接続された導線の端部までの半ループ状の一対の素子が対称性を有する形状を有し、上記誘電体基体は上記帯状の導電体パターンが形成された外周面において、該帯状の導電体パターンより幅広い横幅を有する、ループアンテナ装置 A first aspect of the present invention for achieving the above object, there the loop antenna device having an antenna element including an installation dielectric substrate to the conductor on the plate, the conductor pattern formed on said substrate Te, the conductive pattern is connected to both ends of the conductor plates, the dielectric is formed in a strip shape on the outer peripheral surface of the base, the antenna element through the dielectric substrate, the conductive material pattern end are connected, and connected to wires to the feeding point of the other end conductors on a flat plate, it is composed of the above-mentioned conductive pattern, the joined ends to the conductor flat plate to the end of the connected wire to a feeding point a half-loop shape of the pair of elements a shape having symmetry, the dielectric substrate in the outer peripheral surface in which the strip-shaped conductive pattern is formed, has a wide transverse width than the belt-like conductor pattern, loop The antenna device ある。 A.

この態様によれば、ループ内を何ら誘電体が貫通していない双・半ループアンテナに比して、アンテナ水平面において、従来の低ゲイン方向について電界が強まり、従来の高ゲイン方向について電界が弱まるため、双・半ループアンテナの水平面指向性を全方向に略均一なものとすることができる。 According to this embodiment, as compared with the double-half-loop antenna which any dielectric in the loop does not penetrate, the antenna horizontal plane, the conventional low gain direction intensified electric field, the electric field is weakened for conventional high gain direction Therefore, the horizontal directivity of the double-half-loop antenna can be made substantially uniform in all directions.

上記目的を達成するための本発明の第二の態様は、導電体平板上に設置された誘電体基体と、該基体に形成された導電体パターンを含むアンテナ素子とを有するループアンテナ装置であって、上記導電体パターンは、一端が導電体平板に接続され、他端が導電体平板上に設けられた給電点に接続され、上記誘電体基体の外周面上に帯状に形成され、上記アンテナ素子は半ループ状の形状を有し、上記誘電体基体は上記帯状の導電体パターンが形成された外周面において、該帯状の導電体パターンより幅広い横幅を有する、ループアンテナ装置である。 A second aspect of the present invention for achieving the above object, there the loop antenna device having an antenna element including an installation dielectric substrate to the conductor on the plate, the conductor pattern formed on said substrate Te, the conductive pattern has one end connected to the conductor plates and the other end is connected to a feeding point provided on the conductor on the plate, formed in a strip shape on the outer peripheral surface of the dielectric substrate, said antenna element has a half-loop shape, the dielectric substrate in the outer peripheral surface of the conductor pattern is formed in the strip, it has a wide transverse width than the belt-like conductor pattern is a loop antenna device.

この態様によれば、ループ内を何ら誘電体が貫通していない半ループアンテナに比して、アンテナ水平面において、従来の低ゲイン方向について電界が強まり、従来の高ゲイン方向について電界が弱まるため、半ループアンテナの水平面指向性を全方向に略均一なものとすることができる。 According to this embodiment, as compared with the half-loop antenna which any dielectric in the loop does not penetrate, the antenna horizontal plane, intensified electric field for the conventional low-gain direction, the electric field is weakened for conventional high gain direction, the horizontal directional half-loop antenna can be made substantially uniform in all directions.

上記目的を達成するための本発明の第三の態様は、誘電体基体に形成された導電体パターンを含むアンテナ素子を有するループアンテナ装置であって、上記導電体パターンは、所定位置にて給電点に接続され、上記誘電体基体の外周面上に帯状に形成され、上記アンテナ素子はループ状の形状を有し、上記誘電体基体は上記帯状の導電体パターンが形成された外周面において、該帯状の導電体パターンより幅広い横幅を有する、ループアンテナ装置である。 A third aspect of the present invention for achieving the above object, a loop antenna device having an antenna element including a conductor pattern formed on the dielectric substrate, the conductive patterns, feeding at a predetermined position is connected to the point, is formed in a strip shape on the outer peripheral surface of the dielectric substrate, said antenna element has a loop-like shape, in the dielectric substrate is an outer peripheral surface in which the strip-shaped conductive pattern is formed, with broad lateral width than the belt-like conductor pattern is a loop antenna device.

この態様によれば、ループ内を何ら誘電体が貫通していないループアンテナに比して、アンテナ水平面において、従来の低ゲイン方向について電界が強まり、従来の高ゲイン方向について電界が弱まるため、ループアンテナの水平面指向性を全方向に略均一なものとすることができる。 According to this embodiment, as compared to the loop any loop dielectric does not extend through the antenna, the antenna horizontal plane, intensified electric field for the conventional low-gain direction, the electric field is weakened for conventional high gain direction, loop the horizontal directivity of the antenna can be made substantially uniform in all directions.

なお、上記第一〜第三の態様において、「誘電体基体」を形成する誘電体は例えばセラミックであるが、ガラエポなどのエポキシ樹脂、PPOなどのポリエーテル樹脂、BTレジン、テフロン(登録商標)などのPTFE樹脂、など任意の誘電体でよい。 In the above first to third aspects, the dielectric to form a "dielectric substrate" is a ceramic for example, an epoxy resin such as glass epoxy, polyether resins, such as PPO, BT resin, Teflon® PTFE resin such as may be any dielectric, such as.

また、上記第一〜第三の態様において、上記誘電体基体の誘電率εの選定及び/又は上記横幅の長さの設定により上記誘電体基体の実効誘電率が変化するため、これら両パラメータを適切に選ぶことによって所望の水平面指向性を得ることができる。 In the above first to third aspects, since the effective dielectric constant of the dielectric substrate selection of the dielectric constant ε of and / or the dielectric substrate by setting the length of the horizontal width changes, both of these parameters it is possible to obtain a desired horizontal directivity by appropriately choosing.

また、上記第一〜第三の態様においては、上記誘電体基体の外周面に帯状の溝を設け、該溝に上記導電体パターンを形成し、該溝の深さに応じて、所望の垂直面指向性を得ることも可能である。 Further, in the above-described first to third embodiments, the dielectric is provided a strip-like grooves on the outer circumferential surface of the substrate to form the conductive pattern in the groove, according to the depth of the groove, the desired vertical it is also possible to obtain a surface directivity.

さらに、本発明の応用例として、上記第一の態様に係るループアンテナ装置を2つ組み合わせ、一方の前記ループアンテナ装置の前記導電体平板との接触面に凹部を設け、他方の前記ループアンテナ装置を前記導電体平板に設置したときに前記凹部内に収容されるように設計し、前記ループアンテナ装置双方について、給電線及び給電点を共有化すると共に、インピーダンス整合をとった、2周波数対応ループアンテナ装置も可能である。 Further, as an application example of the present invention, the two combining a loop antenna device according to the first embodiment, the concave portion is provided on the contact surface between the conductor flat plate of one of the loop antenna device, the other of said loop antenna device said designed to be housed in the recess when installed in the conductor plates for both the loop antenna device, as well as share the feed line and the feeding point, took the impedance matching, 2 frequency corresponding loop the antenna device is also possible.

本発明によれば、水平面指向性が略無指向性である、又は、任意の水平面指向性を設定可能であるループアンテナ装置を提供することができる。 According to the present invention, a horizontal plane directivity is substantially non-directional, or can provide a loop antenna device can be set to any horizontal plane directivity.

以下、本発明を実施するための最良の形態について、添付図面を参照しながら実施例を挙げて説明する。 Hereinafter, the best mode for carrying out the present invention will be described by way of example with reference to the accompanying drawings. なお、ループ状のアンテナ素子を有するアンテナ装置の基本概念、主要なハードウェア構成、作動原理、及び基本的な制御手法等については当業者には既知であるため、詳しい説明を省略する。 Since the basic concept of the antenna device having a loop-shaped antenna element, the main hardware configuration, operating principle, and the basic control method and the like are known to those skilled in the art, a detailed description thereof will be omitted.

まず、図3〜5を参照して、本発明の実施例1について説明する。 First, referring to FIGS. 3-5, a description will be given of an embodiment 1 of the present invention. 図3は、本実施例に係るループアンテナ装置300の斜視図である。 Figure 3 is a perspective view of a loop antenna device 300 according to this embodiment.

ループアンテナ装置300は、略直方体のセラミック基体301上に形成された導電体パターン302と、セラミック基体301の開けられた穴を通じて導電体パターン302と給電点303とをつなぐ中心導線304とから成るアンテナ素子を有する。 Loop antenna device 300 is composed of a conductive pattern 302 formed on a substantially rectangular ceramic substrate 301, the center conductor 304. which connects the conductive pattern 302 through drilled holes of the ceramic substrate 301 and the feeding point 303 antenna having an element. 便宜上、導電体パターン302の厚さは図3では図示を省略している。 For convenience, the thickness of the conductive patterns 302 are not shown in FIG.

図示するように、ループアンテナ装置300は、双・半ループアンテナであり、地板(導電体平板)305上に設置される。 As shown, the loop antenna device 300 is a bi-half-loop antenna, is installed on the base plate (conductive flat plate) 305. 地板305は、グランドとして機能し得るものであれば任意の導電体でよい。 The main plate 305 may be any conductor as long as it can function as a ground.

導電体パターン302の形成手法は任意でよく、例えばマイクロストリップアンテナの場合と同様の手法(例えば蒸着など)を用いることが可能である。 Formation method of the conductive patterns 302 may be arbitrary, for example it is possible to use a similar approach in the case of the microstrip antenna (such as evaporation, etc.).

中心導線304は、例えば、導電体パターン302形成後にセラミック基体301に開けられた穴に挿入され、導電体パターン302との間で半田付けされる。 Center conductor 304, for example, is inserted after the conductive patterns 302 formed on the hole drilled in the ceramic substrate 301 is soldered between the conductor patterns 302.

このように誘電体であるセラミックの基体301上に導電体パターン302を形成し、これを導線304によって給電点303と接続することによって、半ループ状のアンテナ素子の半環内を誘電体であるセラミックが貫通しており、且つ、中心導線304が周囲をセラミックで囲まれている状態とする。 Thus the conductor pattern 302 is formed on the ceramic substrate 301 is a dielectric, by connecting the feeding point 303 to thereby lead 304 is the dielectric within the semi-ring half loop-shaped antenna element ceramic extends through, and is a state in which the center conductor 304 is surrounded by a ceramic around.

図4は、図3のループアンテナ装置300を導電体パターン302上でXZ平面で切った断面図である。 Figure 4 is a sectional view taken along the XZ plane on the conductive pattern 302 of the loop antenna device 300 of FIG. 図示するように、導電体パターン302と導線304とで構成される2つの半ループはその内側がセラミックで埋め尽くされている。 As illustrated, the two half-loop constituted by the conductive pattern 302 and the conductor 304 inside is filled with a ceramic.

ここで、従来の双(・半)ループアンテナではゲインが弱いX方向への放射について考えると、アンテナ素子#1(=中心導線304)からX方向へ放射された電磁波401は、セラミック基体301内を通過するため、導電体パターン302内を通る電流402との間に位相差を生じる。 Here, in the conventional twin (- half) loop antenna considered radiation gain the weak X-direction, the antenna element # 1 (= center conductor 304) electromagnetic wave 401 radiated to the X direction from the ceramic substrate 301 to pass, resulting in a phase difference between the current 402 through the conductive pattern 302. ここで、セラミック基体301の誘電率εを適切に選定することにより、X方向遠方界P において、従来の誘電体無しの場合には互いに弱め合っていたアンテナ素子#1〜3からの電磁波を互いに強め合う関係にすることができる。 Here, by appropriately selecting the dielectric constant of the ceramic substrate 301 epsilon, in the X-direction far field P 1, an electromagnetic wave from the case of conventional dielectric without antenna elements # 1 to 3 were destructively with each other it can be in a relationship that reinforce each other.

図5は、図3のループアンテナ装置300の上面図である。 Figure 5 is a top view of a loop antenna device 300 of FIG. 図示するように、誘電体がループ内を貫通している状態とするため、W 、W >0となっている。 As shown, for a state where the dielectric extends through the loop, and has a W 1, W 2> 0.

ここで、従来の双(・半)ループアンテナではゲインが強いY方向への放射について考えると、アンテナ素子#1(=中心導線304)からY方向へ放射された電磁波501は、セラミック基体301内を通過するため、空気中を進む場合に比して位相がずれる。 Here, in the conventional twin (- half) loop antenna considered radiation to gain a strong Y-direction, the antenna element # 1 (= center conductor 304) electromagnetic wave 501 emitted in the Y direction from the ceramic substrate 301 to pass, out of phase as compared with the case where the process proceeds in air. 他方、セラミック基体301の側面に形成された導電体パターン302の一部であるアンテナ素子#2、3から放射された電磁波502は、誘電体を通過せずに空気中を進む。 On the other hand, the electromagnetic wave 502 radiated from the antenna element # 2 is a part of the conductor pattern 302 formed on the side surfaces of the ceramic base 301, it proceeds through the air without passing through the dielectric. ここで、セラミック基体301の横幅W (又はW )を適切に選定することにより、Y方向遠方界P において、従来の誘電体無しの場合には同相のため互いに強め合っていたアンテナ素子#1〜3からの電磁波を互いに弱め合う関係にすることができる。 Here, by appropriately selecting the width W 2 of the ceramic substrate 301 (or W 1), in the Y-direction far field P 2, antenna elements have constructively with each other for the same phase in the case of the conventional dielectric without # can be related to weaken each other electromagnetic waves from 1-3.

このように、本実施例によれば、セラミック基体301の誘電率εを適切に選定することによって、従来の双ループアンテナではゲインが比較的弱かったX方向への放射を強めることができると共に、セラミック基体301の横幅W 、W を適切に設計することによって、従来の双ループアンテナではゲインが比較的強かったY方向への放射を弱めることができるため、セラミック基体301の材質、サイズ、及び形状によって楕円状で不均一であった双ループアンテナの水平面指向性を全方向に略均一な円状のものとすることが可能となる。 Thus, according to this embodiment, by properly selecting the dielectric constant of the ceramic substrate 301 epsilon, with the conventional double-loop antenna can be enhanced radiation in the X-direction gain is relatively weak, by properly designing the width W 1, W 2 of the ceramic substrate 301, since in the conventional twin loop antenna can be weakened radiation to the gain is relatively strong Y-direction, the material of the ceramic substrate 301, the size, and it is possible to assume a horizontal plane directivity of the twin loop antenna was heterogeneous with elliptical substantially uniform circular in all directions by the shape.

次いで、図6〜9を参照して、本発明の実施例2について説明する。 With reference to Figures 6-9, a description will be given of an embodiment 2 of the present invention. 本実施例に係るループアンテナ装置は、上述の実施例1のものとほぼ類似した構成を有する。 Loop antenna device according to the present embodiment has a substantially similar configuration to that of Example 1 above. ただし、実施例1では主として全方向に均一な水平面指向性の実現が狙いとされているのに対し、本実施例では、セラミック基体の形状を適宜設計することによって、特定の方向に強い又は弱いゲインを持った所望の水平面指向性を実現することが狙いとされる。 However, while the realization of uniform horizontal directivity in all directions mainly in the first embodiment is aimed, in the present embodiment, by appropriately designing the shape of the ceramic base, strong or weak in a particular direction it is the aim to achieve a desired horizontal directional with a gain.

より具体的には、上述の実施例1では、セラミック基体301が略直方体であるものとし、水平面指向性について主としてX方向(+/−)・Y方向(+/−)の4方向について考察したが、本発明に係るループアンテナ装置のセラミック基体の形状は本来直方体に限られず、任意の形状とすることができることを利用し、本実施例ではその形状を工夫する。 More specifically, in the first embodiment described above, and shall ceramic substrate 301 is substantially rectangular parallelepiped, and discussed four directions mainly X-direction about the horizontal plane directivity (+/-) · Y direction (+/-) but the shape of the ceramic substrate of the loop antenna device according to the present invention utilizes the fact that originally not limited to a rectangular parallelepiped, can be any shape, in this embodiment it devised its shape.

図6は、本実施例に係るループアンテナ装置の一例の上面図である。 Figure 6 is a top view of an example of a loop antenna device according to the present embodiment. 上記実施例1の場合と同じ構成要素には同じ符号を付している。 It is denoted by the same reference numerals to the same components as in the first embodiment.

図6に示したループアンテナ装置のセラミック基体301aは、中心導体304から放射状に発せられる電磁波について着目すると、図示するように方向Aについては誘電体の幅が短く、方向Bについては誘電体の幅が長い。 Ceramic substrate 301a of the loop antenna device shown in FIG. 6, when paying attention to the electromagnetic wave emitted from the center conductor 304 radially shorter width of the dielectric for the direction A as shown, for direction B the width of the dielectric It is long. したがって、既述のように、方向Aに対してはアンテナゲインが強くなり、方向Bに対してはアンテナゲインが弱くなる。 Therefore, as described above, the antenna gain becomes strong relative to the direction A, the antenna gain is weakened with respect to the direction B.

したがって、図6に示したループアンテナ装置によれば、方向Bよりも方向Aに対して指向性を持ったアンテナ水平面指向性を実現することができる。 Therefore, according to the loop antenna device shown in FIG. 6, it is possible to realize an antenna horizontal plane directivity having directivity to the direction A than in the direction B.

このように、中心導体304から放射された電磁波が通過する誘電体の厚さを変えることによって、特定の方向についてアンテナ素子#1〜3から放射された電磁波の関係を弱め合う関係や強め合う関係に設定することができる。 Thus, the center by radiated electromagnetic wave varying the thickness of the dielectric passing from conductor 304, a particular direction for the antenna elements # radiated electromagnetic waves relationship destructive relationship and constructive relations from 1-3 it can be set to.

図6に示したセラミック基体301aは一例に過ぎず、例えば、図7に示すような略十字状のセラミック基体301bや、図8に示すような略八角形状のセラミック基体301cも可能である。 Ceramic substrate 301a illustrated in FIG. 6 is merely an example, for example, substantially or cross-shaped ceramic substrate 301b as shown in FIG. 7, it is also possible ceramic substrate 301c having a substantially octagonal shape as shown in FIG.

さらに、本発明に係るループアンテナ装置におけるセラミック基体の形状は、高さ方向(すなわち地板305に垂直な方向)についても任意に設計することができるため、例えば図9に示す一例のように、導電体パターン302の周辺のセラミック基体を導電体パターンの高さより高くすることによって、Y方向上方に対してもアンテナゲインを弱めることができる。 Furthermore, the shape of the ceramic substrate in the loop antenna device according to the present invention, it is possible to arbitrarily design also the height direction (i.e. the direction perpendicular to the main plate 305), for example, as the example shown in FIG. 9, the conductive by the ceramic substrate near the body pattern 302 higher than the height of the conductor pattern, it is possible to weaken the antenna gain with respect to the Y direction upward. すなわち、導電体パターン302とセラミック基体の高さに差をつけることによって、所望の垂直面指向性も得ることができる。 That is, by putting a difference in height of the conductive pattern 302 and the ceramic substrate, can be obtained the desired vertical pattern.

図9に示す本実施例に係るループアンテナ装置の一例は、例えば、セラミック基体の外周に帯状の溝を形成し、その溝の底面に対して導電体パターンを蒸着させることによって容易に製造可能である。 An example of a loop antenna device according to the embodiment shown in FIG. 9, for example, a strip-like groove is formed on the outer periphery of the ceramic substrate, readily manufacturable by depositing the conductive pattern relative to the bottom surface of the groove is there.

このように、本実施例によれば、セラミック基体の形状を適宜設計することによって、所望の水平面及び垂直面指向性を実現することができる。 Thus, according to this embodiment, by appropriately designing the shape of the ceramic substrate, it is possible to achieve the desired horizontal and vertical pattern.

次いで、図10及び11を参照して、本発明の実施例3について説明する。 Then, with reference to FIGS. 10 and 11, a description will be given of an embodiment 3 of the present invention. 本実施例に係るループアンテナ装置は、大きさの異なる上記実施例1に係るループアンテナ装置を2つ重ねた構造を有し、2つの周波数に対応可能としたものである。 Loop antenna device according to the present embodiment includes two stacked structure in which the loop antenna device according to a different first embodiment of magnitude is obtained by enabling corresponding to two frequencies.

図10は、本実施例に係る2周波数対応ループアンテナ装置の組立図である。 Figure 10 is an assembly view of the two frequencies corresponding loop antenna device according to the present embodiment. 本実施例では、実施例1に係るループアンテナ装置300を大小2個用いる。 In this embodiment, a two large and small loop antenna device 300 according to the first embodiment. 小さい方のループアンテナ装置は基本的にループアンテナ装置300のままであり、大きい方のループアンテナ装置300aは地板305との接触面に小さい方のループアンテナ装置300を完全に収容するのに十分な大きさのくぼみ(凹部)が設けられる。 Loop antenna device of the smaller remains essentially the loop antenna device 300, the larger the loop antenna device 300a is sufficient loop antenna device 300 of the smaller contact surface between the base plate 305 to fully accommodate the size indentation (recess) is provided.

図11は、本実施例に係る2周波数対応ループアンテナ装置を導電体パターン302上でXZ平面で切った断面図である。 Figure 11 is a sectional view taken along the XZ plane 2 frequency corresponding loop antenna device according to the present embodiment on the conductive pattern 302.

図示するように、外側のループアンテナ装置300aと内側のループアンテナ装置300は給電点303及び中心導線304aを共有する。 As shown, the outer loop antenna device 300a and inside the loop antenna device 300 share the feeding point 303 and the center conductor 304a. このような構成において両者についてインピーダンス整合をとることによって、外側と内側のループアンテナをそれぞれ異なる周波数で共振させることができ、結果として装置全体を2周波数対応とすることができる。 By taking both impedance matching for such a configuration, it is possible to resonate at different frequencies outside and inside of the loop antenna, respectively, as a result the entire device can be 2 frequencies corresponding.

また、外側のループアンテナ装置300aのセラミック基体301eに設けられたくぼみの内壁と、内側のループアンテナ装置300の表面(特に、導電体パターン302の表面)との間には空隙1101が設けられる。 Further, the inner wall of the recess provided in the ceramic substrate 301e of the outer loop antenna device 300a, the surface of the inner loop antenna device 300 (especially, the surface of the conductive pattern 302) void 1101 is provided between the. 導電体パターン302が上下から誘電体に挟まれると実効誘電率が変化してしまうため、このような空隙1101が確保されるようにセラミック基体301e(のくぼみ)を設計することによって、内側のループアンテナ装置300が実施例1のものと同様に機能させることができる。 Since the conductive patterns 302 are vertically sandwiched between the dielectric effective dielectric constant is changed, by designing the ceramic substrate 301 e (depressions) as such void 1101 is secured, the inner loop antenna apparatus 300 can function similar to that of example 1.

このように、本実施例によれば、本発明に係るループアンテナ装置を2つ用いて容易に2周波数に対応可能なループアンテナ装置を実現することができる。 Thus, according to this embodiment, it is possible to easily realize the loop antenna device capable of handling 2 frequency loop antenna device according to the present invention using two.

なお、本実施例においても、セラミック基体の形状は所望の指向性に応じて任意に設計できることは明らかである。 Also in this embodiment, the shape of the ceramic substrate is clear that can be arbitrarily designed depending on the desired directivity.

以上、本発明の実施例1〜3について説明したが、上記説明における「セラミック基体」は、セラミックに限られず、誘電体であれば任意の材料から形成された基体でよい。 Having described first to third embodiments of the present invention, "ceramic substrate" in the above description it is not limited to a ceramic, or a substrate formed from any material as long as the dielectric. 例えば、ガラエポなどのエポキシ樹脂、PPOなどのポリエーテル樹脂、BTレジン、テフロン(登録商標)などのPTFE樹脂、などの誘電体から形成された基体が代替として考えられる。 For example, an epoxy resin such as glass epoxy, polyether resins, such as PPO, BT resin, Teflon (registered trademark) PTFE resins such as the substrate formed from a dielectric such as contemplated as an alternative.

本発明は、例えば無線LANなどの通信システムにおいて無指向性アンテナ又は指向性アンテナとして利用することができる。 The present invention, for example, can be used as a non-directional antenna or a directional antenna in a communication system such as a wireless LAN. 通信方式や通信されるデータの内容は問わない。 The contents of the data, which is the communication method and communication does not matter.

(a)従来の双ループアンテナの概略図である。 (A) is a schematic view of a conventional twin loop antenna. (b)従来の双・半ループアンテナの概略図である。 (B) it is a schematic diagram of a conventional double-half-loop antenna. (a)共振時に従来の双ループアンテナに流れる電流を示す概略図である。 (A) is a schematic diagram illustrating a current flowing through the conventional twin loop antenna at resonance. (b)図2(a)の双ループアンテナと等価な3本のダイポールアンテナを示す概略図である。 (B) is a schematic view showing a twin loop antenna equivalent three dipole antenna of FIG. 2 (a). 本発明の実施例1に係るループアンテナ装置の斜視図である。 It is a perspective view of a loop antenna device according to a first embodiment of the present invention. 本発明の実施例1に係るループアンテナ装置を導電体パターン上でXZ平面で切った断面図である。 The loop antenna device according to a first embodiment of the present invention is a cross-sectional view taken along the XZ plane with a conductor pattern. 本発明の実施例1に係るループアンテナ装置の上面図である。 It is a top view of a loop antenna device according to a first embodiment of the present invention. 本発明の実施例2に係るループアンテナ装置の一例の上面図である。 An example of a loop antenna device according to a second embodiment of the present invention is a top view of the. 本発明の実施例2に係るループアンテナ装置の別の一例の上面図である。 It is a top view of another example of a loop antenna device according to a second embodiment of the present invention. 本発明の実施例2に係るループアンテナ装置の別の一例の上面図である。 It is a top view of another example of a loop antenna device according to a second embodiment of the present invention. 本発明の実施例2に係るループアンテナ装置の別の一例の斜視図である。 It is a perspective view of another example of a loop antenna device according to a second embodiment of the present invention. 本発明の実施例3に係る2周波数対応ループアンテナ装置の組立図である。 It is an assembly view of the two frequencies corresponding loop antenna device according to a third embodiment of the present invention. 本発明の実施例3に係る2周波数対応ループアンテナ装置を導電体パターン上でXZ平面で切った断面図である。 It is a sectional view taken along the XZ plane with a conductor pattern on the 2 frequency corresponding loop antenna device according to a third embodiment of the present invention.

符号の説明 DESCRIPTION OF SYMBOLS

300、300a ループアンテナ装置 301、301a、301b、301c、301d、301e セラミック基体 302 導電体パターン 303 給電点 304、304a 導線 305 グランド板 401、402、501、502 電磁波 1101 空隙 300,300a loop antenna device 301,301a, 301b, 301c, 301d, 301e ceramic substrate 302 conductive pattern 303 feeding point 304,304a conductor 305 ground plate 401,402,501,502 electromagnetic wave 1101 void

Claims (8)

  1. 導電体平板上に設置された誘電体基体と、該基体に形成された導電体パターンを含むアンテナ素子とを有するループアンテナ装置であって、 Installed to the conductor on the flat plate and the dielectric substrate, a loop antenna device comprising an antenna element including a conductor pattern formed on said substrate,
    前記導電体パターンは、両端部が導電体平板に接続され、前記誘電体基体の外周面上に帯状に形成され、 The conductor pattern, both ends connected to the conductor plates are formed in a strip shape on the outer peripheral surface of said dielectric substrate,
    前記アンテナ素子は、前記誘電体基体内を通り、一端が導電体パターンに接続され、他端が導電体平板上の給電点に接続された導線と、前記導電体パターンとから構成され、導電体平板に接続された端部から給電点に接続された導線の端部までの半ループ状の一対の素子が対称性を有する形状を有し、 The antenna element passes through the dielectric substrate, one end of which is connected to the conductor pattern, a conductor whose other end is connected to a feeding point on the conductor plates is composed of said conductive pattern, the conductor half loop-shaped pair of elements from the flat plate connected end to end of the connected wire to a feeding point has a shape having symmetry,
    前記誘電体基体は、前記帯状の導電体パターンが形成された外周面において、該帯状の導電体パターンより幅広い横幅を有する、ことを特徴とするループアンテナ装置。 It said dielectric substrate, in the band-like conductive pattern is an outer peripheral surface formed, has a wide transverse width than the belt-like conductor pattern, a loop antenna apparatus characterized by.
  2. 導電体平板上に設置された誘電体基体と、該基体に形成された導電体パターンを含むアンテナ素子とを有するループアンテナ装置であって、 Installed to the conductor on the flat plate and the dielectric substrate, a loop antenna device comprising an antenna element including a conductor pattern formed on said substrate,
    前記導電体パターンは、一端が導電体平板に接続され、他端が導電体平板上に設けられた給電点に接続され、前記誘電体基体の外周面上に帯状に形成され、 The conductor pattern has one end connected to the conductor plates and the other end is connected to a feeding point provided on the conductor on the plate, formed in a strip shape on the outer peripheral surface of said dielectric substrate,
    前記アンテナ素子は、半ループ状の形状を有し、 The antenna element has a half-loop shape,
    前記誘電体基体は、前記帯状の導電体パターンが形成された外周面において、該帯状の導電体パターンより幅広い横幅を有する、ことを特徴とするループアンテナ装置。 It said dielectric substrate, in the band-like conductive pattern is an outer peripheral surface formed, has a wide transverse width than the belt-like conductor pattern, a loop antenna apparatus characterized by.
  3. 誘電体基体に形成された導電体パターンを含むアンテナ素子を有するループアンテナ装置であって、 A loop antenna device having an antenna element including a conductor pattern formed on the dielectric substrate,
    前記導電体パターンは、所定位置にて給電点に接続され、前記誘電体基体の外周面上に帯状に形成され、 The conductor pattern is connected to a feeding point at a predetermined position, is formed in a strip shape on the outer peripheral surface of said dielectric substrate,
    前記アンテナ素子は、ループ状の形状を有し、 The antenna element has a loop-like shape,
    前記誘電体基体は、前記帯状の導電体パターンが形成された外周面において、該帯状の導電体パターンより幅広い横幅を有する、ことを特徴とするループアンテナ装置。 It said dielectric substrate, in the band-like conductive pattern is an outer peripheral surface formed, has a wide transverse width than the belt-like conductor pattern, a loop antenna apparatus characterized by.
  4. 請求項1乃至3のいずれか一項記載のループアンテナ装置であって、 A loop antenna device according to any one of claims 1 to 3,
    所望の水平面指向性に応じて前記誘電体基体の誘電率が選定される、ことを特徴とするループアンテナ装置。 The dielectric constant of the dielectric substrate in accordance with the desired horizontal directivity is selected, the loop antenna apparatus characterized by.
  5. 請求項1乃至3のいずれか一項記載のループアンテナ装置であって、 A loop antenna device according to any one of claims 1 to 3,
    所望の水平面指向性に応じて前記横幅の長さが設定される、ことを特徴とするループアンテナ装置。 The length of the transverse width according to the desired horizontal directivity is set, the loop antenna apparatus characterized by.
  6. 請求項1乃至3のいずれか一項記載のループアンテナ装置であって、 A loop antenna device according to any one of claims 1 to 3,
    前記誘電体基体の外周面に帯状の溝を設け、該溝に前記導電体パターンを形成する、ことを特徴とするループアンテナ装置。 Wherein a band-like groove on the outer peripheral surface of the dielectric substrate is provided, to form the conductive pattern in the groove, that a loop antenna device according to claim.
  7. 請求項6記載のループアンテナ装置であって、 A loop antenna device according to claim 6,
    所望の垂直面指向性に応じて前記溝の深さが設定される、ことを特徴とするループアンテナ装置。 Desired depth of the groove is set according to the vertical plane directivity, the loop antenna apparatus characterized by.
  8. 請求項1記載のループアンテナ装置を2つ組み合わせた2周波数対応ループアンテナ装置であって、 A claim 1 second frequency corresponding loop antenna device combining two loop antenna device according,
    一方の前記ループアンテナ装置の前記導電体平板との接触面に凹部を設け、 A recess provided in the contact surface between the conductor flat plate of one of the loop antenna device,
    他方の前記ループアンテナ装置を前記導電体平板に設置したときに前記凹部内に収容されるように設計し、 Designed to said housed in the recess when the other of the loop antenna device is installed on the conductor plates,
    前記ループアンテナ装置双方について、給電線及び給電点を共有化すると共に、インピーダンス整合をとった、ことを特徴とする2周波数対応ループアンテナ装置。 Wherein for both loop antenna device, as well as share the feed line and the feeding point, it took the impedance matching, 2 the frequency corresponding loop antenna apparatus characterized by.
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