JP2021048530A - Coil antenna, antenna device, and electronic apparatus - Google Patents

Abstract

To provide an antenna device capable of securing a necessary binding degree between coils and facilitating connection between a resonance circuit configuration and a feeder circuit, and an electronic apparatus including the same.SOLUTION: A coil antenna 101 comprises an insulating base material, and a first coil conductor L1, a second coil conductor L2, a first terminal electrode P1, a second terminal electrode P2, and a third terminal electrode P3 formed on the base material. The first coil conductor L1 is connected between the first terminal electrode P1 and the second terminal electrode P2, and the second coil conductor L2 is connected between the second terminal electrode P2 and the third terminal electrode P3. The first coil conductor L1 and the second coil conductor L2 are coupled to each other by a magnetic field. A feeder circuit is connected to the first terminal electrode P1 and the second terminal electrode P2. A first capacitor C1 is connected between the first terminal electrode P1 and the second terminal electrode P2, and a second capacitor C2 is connected between the second terminal electrode P2 and the third terminal electrode P3.SELECTED DRAWING: Figure 1

Description

本発明は、基材に設けられたコイル導体を有するコイルアンテナ、このコイルアンテナを備えるアンテナ装置、及びこのアンテナ装置を備える電子機器に関する。 The present invention relates to a coil antenna having a coil conductor provided on a base material, an antenna device including the coil antenna, and an electronic device including the antenna device.

特許文献１には、コントロール基板に設けた給電コイルと、アンテナ基板に設けたループアンテナとを備え、この給電コイルとループアンテナとを磁界結合させたアンテナ装置が示されている。 Patent Document 1 discloses an antenna device including a feeding coil provided on a control board and a loop antenna provided on an antenna board, and the feeding coil and the loop antenna are magnetically coupled.

特許第４３２５６２１号公報Japanese Patent No. 4325621

特許文献１に記載のアンテナ装置では、給電コイルとループアンテナとの配置関係によっては、両者間の必要な結合度が得られず、その場合には所定のアンテナ特性が得られないことがある。 In the antenna device described in Patent Document 1, depending on the arrangement relationship between the feeding coil and the loop antenna, the required degree of coupling between the two may not be obtained, and in that case, the predetermined antenna characteristics may not be obtained.

上記給電コイルとループアンテナとの結合度を高めるために、同一のフレキシブル基板上に給電コイルとループアンテナとを形成するとしても、共振回路を構成するためにチップキャパシタを設ける場合には、それらの接続関係によっては、部品点数の多さ、実装スペースの確保に課題が生じる。また、フレキシブル基板へのチップキャパシタの実装の難易度が高い、という課題も生じる。 Even if the feeding coil and the loop antenna are formed on the same flexible substrate in order to increase the degree of coupling between the feeding coil and the loop antenna, when a chip capacitor is provided to form a resonance circuit, they are used. Depending on the connection relationship, there are problems in securing a large number of parts and mounting space. In addition, there is a problem that it is difficult to mount the chip capacitor on the flexible substrate.

そこで、本発明の目的は、コイル同士の必要な結合度を確保し、共振回路の構成及び給電回路との接続を容易にしたコイルアンテナ、このコイルアンテナを備えるアンテナ装置及びそれを備える電子機器を提供することにある。 Therefore, an object of the present invention is to provide a coil antenna that secures the necessary degree of coupling between the coils and facilitates the configuration of the resonance circuit and the connection with the power feeding circuit, an antenna device provided with the coil antenna, and an electronic device including the coil antenna. To provide.

本開示の一例としてのコイルアンテナは、絶縁性の基材と、この基材に形成され、第１コイル開口を有する第１コイル導体と、前記基材に形成され、第２コイル開口を有する第２コイル導体と、前記基材に形成された、第１端子電極、第２端子電極及び第３端子電極と、を備える。そして、第１コイル導体は第１端子電極と第２端子電極との間に接続され、第２コイル導体は第２端子電極と第３端子電極との間に接続され、前記基材の平面視で、第１コイル開口と第２コイル開口とは互いに重なり、第１コイル導体と第２コイル導体とは互いに磁界結合し、第１端子電極と第２端子電極とに給電回路が接続される。 A coil antenna as an example of the present disclosure has an insulating base material, a first coil conductor formed on the base material and having a first coil opening, and a first coil conductor formed on the base material and having a second coil opening. It includes a two-coil conductor and a first terminal electrode, a second terminal electrode, and a third terminal electrode formed on the base material. Then, the first coil conductor is connected between the first terminal electrode and the second terminal electrode, the second coil conductor is connected between the second terminal electrode and the third terminal electrode, and the substrate is viewed in plan view. Then, the first coil opening and the second coil opening overlap each other, the first coil conductor and the second coil conductor are magnetically coupled to each other, and the feeding circuit is connected to the first terminal electrode and the second terminal electrode.

本開示の一例としてのアンテナ装置は、上記構成のコイルアンテナと、前記基材に対向する回路基板と、この回路基板に配置された第１キャパシタと、回路基板に配置された第２キャパシタと、を備え、第１キャパシタは第１端子電極と第２端子電極との間に接続され、第２キャパシタは第２端子電極と第３端子電極との間に接続される。 An antenna device as an example of the present disclosure includes a coil antenna having the above configuration, a circuit board facing the base material, a first capacitor arranged on the circuit board, and a second capacitor arranged on the circuit board. The first capacitor is connected between the first terminal electrode and the second terminal electrode, and the second capacitor is connected between the second terminal electrode and the third terminal electrode.

本開示の一例としてのアンテナ装置は、上記構成のコイルアンテナと、前記基材に対向する回路基板と、この回路基板に配置された第１キャパシタと、回路基板に配置された第２キャパシタと、を備え、第１キャパシタは第１端子電極と第２端子電極との間に接続され、第２キャパシタは第１端子電極と第３端子電極との間に接続される。 An antenna device as an example of the present disclosure includes a coil antenna having the above configuration, a circuit board facing the base material, a first capacitor arranged on the circuit board, and a second capacitor arranged on the circuit board. The first capacitor is connected between the first terminal electrode and the second terminal electrode, and the second capacitor is connected between the first terminal electrode and the third terminal electrode.

本開示の一例としての電子機器は、上記構成のアンテナ装置及び当該アンテナ装置に接続される給電回路を備える。 An electronic device as an example of the present disclosure includes an antenna device having the above configuration and a power feeding circuit connected to the antenna device.

本発明によれば、コイル同士の必要な結合度を確保し、共振回路の構成及び給電回路との接続を容易にしたコイルアンテナ、このコイルアンテナを備えるアンテナ装置及びそれを備える電子機器が得られる。 According to the present invention, it is possible to obtain a coil antenna that secures the necessary degree of coupling between coils and facilitates the configuration of a resonance circuit and connection with a power feeding circuit, an antenna device provided with this coil antenna, and an electronic device including the coil antenna. ..

図１は、第１の実施形態に係るコイルアンテナ１０１、アンテナ装置１１１及び電子機器２０１の回路図である。FIG. 1 is a circuit diagram of a coil antenna 101, an antenna device 111, and an electronic device 201 according to the first embodiment. 図２は第１の実施形態に係るコイルアンテナ１０１の構成を示す主要部の分解斜視図である。FIG. 2 is an exploded perspective view of a main part showing the configuration of the coil antenna 101 according to the first embodiment. 図３はコイルアンテナ１０１の分解平面図である。FIG. 3 is an exploded plan view of the coil antenna 101. 図４は第１の実施形態に係る別のコイルアンテナの分解平面図である。FIG. 4 is an exploded plan view of another coil antenna according to the first embodiment. 図５は、第１の実施形態のアンテナ装置１１１及びそれに接続される回路の回路図である。FIG. 5 is a circuit diagram of the antenna device 111 of the first embodiment and the circuit connected to the antenna device 111. 図６は、第２の実施形態に係るコイルアンテナ、アンテナ装置及び電子機器の回路図である。FIG. 6 is a circuit diagram of the coil antenna, the antenna device, and the electronic device according to the second embodiment. 図７は第２の実施形態に係るコイルアンテナ１０２の構成を示す主要部の分解斜視図である。FIG. 7 is an exploded perspective view of a main part showing the configuration of the coil antenna 102 according to the second embodiment. 図８はコイルアンテナ１０２の分解平面図である。FIG. 8 is an exploded plan view of the coil antenna 102. 図９は第２の実施形態に係る別のコイルアンテナ１０２Ａの構成を示す主要部の分解斜視図である。FIG. 9 is an exploded perspective view of a main part showing the configuration of another coil antenna 102A according to the second embodiment. 図１０はコイルアンテナ１０２Ａの分解平面図である。FIG. 10 is an exploded plan view of the coil antenna 102A. 図１１（Ａ）は、第３の実施形態に係るコイルアンテナ１０３の平面図であり、図１１（Ｂ）はその下面図である。FIG. 11A is a plan view of the coil antenna 103 according to the third embodiment, and FIG. 11B is a bottom view thereof. 図１２は第３の実施形態に係るコイルアンテナ１０３の分解平面図である。FIG. 12 is an exploded plan view of the coil antenna 103 according to the third embodiment. 図１３（Ａ）は、第４の実施形態に係るコイルアンテナ１０４の平面図であり、図１３（Ｂ）はその下面図である。13 (A) is a plan view of the coil antenna 104 according to the fourth embodiment, and FIG. 13 (B) is a bottom view thereof. 図１４は第４の実施形態に係るコイルアンテナ１０４の分解平面図である。FIG. 14 is an exploded plan view of the coil antenna 104 according to the fourth embodiment. 図１５（Ａ）、図１５（Ｂ）は、第５の実施形態に係る電子機器の内部の構成を示す平面図である。15 (A) and 15 (B) are plan views showing the internal configuration of the electronic device according to the fifth embodiment.

以降、図を参照して幾つかの具体的な例を挙げて、本発明を実施するための複数の形態を示す。各図中には同一箇所に同一符号を付している。要点の説明又は理解の容易性を考慮して、便宜上実施形態を分けて示すが、異なる実施形態で示した構成の部分的な置換又は組み合わせは可能である。第２の実施形態以降では第１の実施形態と共通の事柄についての記述を省略し、異なる点についてのみ説明する。特に、同様の構成による同様の作用効果については実施形態毎には逐次言及しない。 Hereinafter, a plurality of embodiments for carrying out the present invention will be shown with reference to the drawings with reference to some specific examples. The same reference numerals are given to the same parts in each figure. Although the embodiments are shown separately for convenience in consideration of the explanation of the main points or the ease of understanding, partial replacement or combination of the configurations shown in the different embodiments is possible. In the second and subsequent embodiments, the description of matters common to the first embodiment will be omitted, and only the differences will be described. In particular, the same action and effect due to the same configuration will not be mentioned sequentially for each embodiment.

各実施形態に示す「アンテナ装置」は、信号（又は電力）の送信（送電）側、受信（受電）側のいずれにも適用できる。この「アンテナ装置」を、磁束を放射するアンテナとして説明する場合でも、そのアンテナ装置が磁束の発生源であることに限るものではない。伝送相手側アンテナ装置が発生した磁束を受ける（鎖交する）場合にも、すなわち送受の関係が逆であっても、同様の作用効果を奏する。 The "antenna device" shown in each embodiment can be applied to either the transmission (transmission) side or the reception (power reception) side of a signal (or electric power). Even when this "antenna device" is described as an antenna that radiates magnetic flux, the antenna device is not limited to the source of magnetic flux. The same effect is obtained even when the transmission partner antenna device receives (interlinks) the generated magnetic flux, that is, even if the transmission / reception relationship is reversed.

各実施形態に係る「アンテナ装置」は、「無線伝送システム」に用いられるアンテナ装置である。ここで、「無線伝送システム」は、伝送相手（外部機器のアンテナ）と、磁界結合による無線伝送を行うシステムである。「伝送」は、信号の送受信と電力の送受信との両方の意味を含む。また、「無線伝送システム」は、近距離無線通信システムと無線給電システムとの両方の意味を含む。アンテナ装置は磁界結合による無線伝送を行うため、アンテナ装置の電流経路の長さつまり後述のコイル導体の線路長は、無線伝送で使用される周波数における波長λに比べて十分に小さく、λ／１０以下である。したがって、無線伝送の使用周波数帯においては電磁波の放射効率は低い。コイル導体の両端は、給電回路に接続され、アンテナ装置の電流経路つまりコイル導体には、ほぼ一様な大きさの電流が流れる。 The "antenna device" according to each embodiment is an antenna device used in the "wireless transmission system". Here, the "wireless transmission system" is a system that performs wireless transmission by magnetic field coupling with a transmission partner (antenna of an external device). "Transmission" includes both the transmission and reception of signals and the transmission and reception of electric power. Also, "wireless transmission system" includes the meaning of both a short-range wireless communication system and a wireless power supply system. Since the antenna device performs wireless transmission by magnetic field coupling, the length of the current path of the antenna device, that is, the line length of the coil conductor described later, is sufficiently smaller than the wavelength λ at the frequency used in wireless transmission, and is λ / 10. It is as follows. Therefore, the radiation efficiency of electromagnetic waves is low in the frequency band used for wireless transmission. Both ends of the coil conductor are connected to a power feeding circuit, and a current of substantially uniform magnitude flows through the current path of the antenna device, that is, the coil conductor.

また、各実施形態に係る「アンテナ装置」に用いられる近距離無線通信としては、例えばＮＦＣ（Near Field Communication）がある。近距離無線通信で使用される周波数帯は、例えばＨＦ帯であり、特に１３．５６ＭＨｚ及びその近傍の周波数帯である。 Further, as a short-range wireless communication used in the "antenna device" according to each embodiment, there is, for example, NFC (Near Field Communication). The frequency band used in short-range wireless communication is, for example, the HF band, particularly 13.56 MHz and its vicinity.

各実施形態において、「電子機器」とは、スマートフォンやフィーチャーフォン等の携帯電話端末、スマートウォッチやスマートグラス等のウェアラブル端末、ノートＰＣやタブレットＰＣ等の携帯ＰＣ、カメラ、ゲーム機、玩具等の情報機器、ＩＣタグ、ＳＤカード、ＳＩＭカード、ＩＣカード等の情報媒体等、様々な電子機器を指す。 In each embodiment, "electronic devices" include mobile phone terminals such as smartphones and feature phones, wearable terminals such as smart watches and smart glasses, mobile PCs such as notebook PCs and tablet PCs, cameras, game machines, toys, and the like. It refers to various electronic devices such as information devices, IC tags, SD cards, SIM cards, and information media such as IC cards.

《第１の実施形態》
図１は、第１の実施形態に係るコイルアンテナ、アンテナ装置及び電子機器の回路図である。 << First Embodiment >>
FIG. 1 is a circuit diagram of a coil antenna, an antenna device, and an electronic device according to the first embodiment.

図１に示す電子機器２０１は、アンテナ装置１１１と、このアンテナ装置１１１に接続された給電回路１とで構成される。コイルアンテナ１０１は、第１コイル導体Ｌ１と、第２コイル導体Ｌ２と、第１端子電極Ｐ１、第２端子電極Ｐ２及び第３端子電極Ｐ３とを備える。第１コイル導体Ｌ１と第２コイル導体Ｌ２は互いに電磁界結合する。コイルアンテナ１０１の構造例は後に示す。第１端子電極Ｐ１と第２端子電極Ｐ２とに給電回路１が接続される。 The electronic device 201 shown in FIG. 1 includes an antenna device 111 and a power feeding circuit 1 connected to the antenna device 111. The coil antenna 101 includes a first coil conductor L1, a second coil conductor L2, a first terminal electrode P1, a second terminal electrode P2, and a third terminal electrode P3. The first coil conductor L1 and the second coil conductor L2 are electromagnetically coupled to each other. A structural example of the coil antenna 101 will be shown later. The power feeding circuit 1 is connected to the first terminal electrode P1 and the second terminal electrode P2.

アンテナ装置１１１は、コイルアンテナ１０１、第１キャパシタＣ１及び第２キャパシタＣ２を備える。第１キャパシタＣ１は第１端子電極Ｐ１と第２端子電極Ｐ２との間に接続され、第２キャパシタＣ２は第２端子電極Ｐ２と第３端子電極Ｐ３との間に接続される。 The antenna device 111 includes a coil antenna 101, a first capacitor C1 and a second capacitor C2. The first capacitor C1 is connected between the first terminal electrode P1 and the second terminal electrode P2, and the second capacitor C2 is connected between the second terminal electrode P2 and the third terminal electrode P3.

図２は第１の実施形態に係るコイルアンテナ１０１の構成を示す主要部の分解斜視図である。図３は、このコイルアンテナ１０１の分解平面図である。 FIG. 2 is an exploded perspective view of a main part showing the configuration of the coil antenna 101 according to the first embodiment. FIG. 3 is an exploded plan view of the coil antenna 101.

第１コイル導体Ｌ１は、基材１１の第１主面Ｓ１に形成されたコイル導体である。このコイル導体は、第１コイル開口ＣＯ１を有する矩形スパイラル状のコイル導体である。また、第２コイル導体Ｌ２は、基材１１の第２主面Ｓ２に形成されたコイル導体である。このコイル導体は、第２コイル開口ＣＯ２を有する矩形スパイラル状のコイル導体である。基材１１の第１主面Ｓ１と基材１１の第２主面Ｓ２とは一つの基材（フレキシブル基板）において対向する面である。図２においては基材１１の第１主面Ｓ１及び第２主面Ｓ２の図示を省略している。この例では、基材１１の外形寸法は35mm×25mmである。 The first coil conductor L1 is a coil conductor formed on the first main surface S1 of the base material 11. This coil conductor is a rectangular spiral-shaped coil conductor having a first coil opening CO1. Further, the second coil conductor L2 is a coil conductor formed on the second main surface S2 of the base material 11. This coil conductor is a rectangular spiral-shaped coil conductor having a second coil opening CO2. The first main surface S1 of the base material 11 and the second main surface S2 of the base material 11 are surfaces facing each other in one base material (flexible substrate). In FIG. 2, the first main surface S1 and the second main surface S2 of the base material 11 are not shown. In this example, the external dimensions of the base material 11 are 35 mm × 25 mm.

第１コイル導体Ｌ１のコイル導体の外周端は第１端子電極Ｐ１に繋がっていて、その内周端は第２端子電極Ｐ２に繋がっている。第２コイル導体Ｌ２のコイル導体の外周端は層間接続導体Ｖ３を介して第３端子電極Ｐ３に導通していて、その内周端は層間接続導体Ｖ２を介して第２端子電極Ｐ２に導通している。 The outer peripheral end of the coil conductor of the first coil conductor L1 is connected to the first terminal electrode P1, and the inner peripheral end thereof is connected to the second terminal electrode P2. The outer peripheral end of the coil conductor of the second coil conductor L2 is conducting to the third terminal electrode P3 via the interlayer connecting conductor V3, and the inner peripheral end thereof is conducting to the second terminal electrode P2 via the interlayer connecting conductor V2. ing.

上記基材１１の下面には磁性体シート１０が重ねられている。この磁性体シート１０は、例えば磁性体粉をポリマー中に分散させたシートや、予め数ｍｍ角の個片に分割した多数のフェライト板をフィルムに貼付したシートである。磁性体シート１０は本発明における「磁性体」に相当する。 A magnetic sheet 10 is laminated on the lower surface of the base material 11. The magnetic material sheet 10 is, for example, a sheet in which magnetic material powder is dispersed in a polymer, or a sheet in which a large number of ferrite plates previously divided into pieces of several mm square are attached to a film. The magnetic material sheet 10 corresponds to the "magnetic material" in the present invention.

第１コイル導体Ｌ１のコイル導体の第１端子電極Ｐ１から第２端子電極Ｐ２への巻回方向と、第２コイル導体Ｌ２のコイル導体の第３端子電極Ｐ３から第２端子電極Ｐ２への巻回方向とは同方向である。 The winding direction of the coil conductor of the first coil conductor L1 from the first terminal electrode P1 to the second terminal electrode P2 and the winding of the coil conductor of the second coil conductor L2 from the third terminal electrode P3 to the second terminal electrode P2. The direction of rotation is the same.

第１コイル導体Ｌ１の第１コイル開口ＣＯ１と第２コイル導体Ｌ２の第２コイル開口ＣＯ２とは基材の平面視で重なり、第１コイル導体Ｌ１と第２コイル導体Ｌ２とは磁界結合する。第１コイル導体Ｌ１の第１コイル開口ＣＯ１と第２コイル導体Ｌ２の第２コイル開口ＣＯ２とは基材の平面視で部分的に重なる形態であってもよいが、本実施形態においては、第１コイル導体Ｌ１の第１コイル開口ＣＯ１と第２コイル導体Ｌ２の第２コイル開口ＣＯ２とはほぼ全体が重なるので、第１コイル導体Ｌ１と第２コイル導体Ｌ２との間の結合係数は、部分的に重なる形態に比べて高い。 The first coil opening CO1 of the first coil conductor L1 and the second coil opening CO2 of the second coil conductor L2 overlap in a plan view of the base material, and the first coil conductor L1 and the second coil conductor L2 are magnetically coupled. The first coil opening CO1 of the first coil conductor L1 and the second coil opening CO2 of the second coil conductor L2 may partially overlap in a plan view of the base material, but in the present embodiment, the first coil opening CO1 and the second coil opening CO2 of the second coil conductor L2 may partially overlap each other. Since the first coil opening CO1 of the 1 coil conductor L1 and the second coil opening CO2 of the second coil conductor L2 almost overlap with each other, the coupling coefficient between the first coil conductor L1 and the second coil conductor L2 is a partial portion. It is higher than the overlapping form.

磁性体シート１０は第１コイル導体Ｌ１と第２コイル導体Ｌ２とを磁界結合させる磁束の磁路として作用するが、後に示すように、コイルアンテナ１０１を電子機器の筐体内に設けた状態で、近接する電子機器の筐体内の他の導体との不要な磁界結合を抑制する。 The magnetic sheet 10 acts as a magnetic path of magnetic flux that magnetically couples the first coil conductor L1 and the second coil conductor L2. As shown later, the magnetic sheet 10 is provided in the housing of the electronic device with the coil antenna 101 provided in the housing of the electronic device. Suppresses unnecessary magnetic flux coupling with other conductors in the housing of nearby electronic devices.

なお、本実施形態においては、第１コイル導体Ｌ１のコイル導体パターンと第２コイル導体Ｌ２のコイル導体パターンとは、基材１１の平面視で略全周に亘って重なる。したがって、コイル導体パターン同士が重ならない場合に比べて、第１コイル導体Ｌ１と第２コイル導体Ｌ２との結合係数は高い。 In the present embodiment, the coil conductor pattern of the first coil conductor L1 and the coil conductor pattern of the second coil conductor L2 overlap with each other over substantially the entire circumference in the plan view of the base material 11. Therefore, the coupling coefficient between the first coil conductor L1 and the second coil conductor L2 is higher than that in the case where the coil conductor patterns do not overlap each other.

図２、図３に示した例では、第１コイル導体Ｌ１と第２コイル導体Ｌ２との電磁界の結合度を容易に高めることができる。また、コイル開口ＣＯ１，ＣＯ２を大きくできるので、通信相手側コイル導体との結合度を容易に高めることができる。 In the examples shown in FIGS. 2 and 3, the degree of coupling of the electromagnetic field between the first coil conductor L1 and the second coil conductor L2 can be easily increased. Further, since the coil openings CO1 and CO2 can be increased, the degree of coupling with the coil conductor on the communication partner side can be easily increased.

図４は第１の実施形態に係る別のコイルアンテナの分解平面図である。図４に示す例では、第１コイル導体Ｌ１は、基材１１の第１主面Ｓ１に形成されたコイル導体で構成されている。このコイル導体は、コイル開口ＣＯを有する矩形スパイラル状のコイル導体である。また、第２コイル導体Ｌ２も、第１主面Ｓ１に形成されたコイル導体で構成されている。このコイル導体は、コイル開口ＣＯを有する矩形スパイラル状のコイル導体である。基材１１の第２主面Ｓ２には接続導体Ｗ２が形成されている。 FIG. 4 is an exploded plan view of another coil antenna according to the first embodiment. In the example shown in FIG. 4, the first coil conductor L1 is composed of a coil conductor formed on the first main surface S1 of the base material 11. This coil conductor is a rectangular spiral-shaped coil conductor having a coil opening CO. Further, the second coil conductor L2 is also composed of the coil conductor formed on the first main surface S1. This coil conductor is a rectangular spiral-shaped coil conductor having a coil opening CO. A connecting conductor W2 is formed on the second main surface S2 of the base material 11.

第１コイル導体Ｌ１のコイル導体の外周端は第１端子電極Ｐ１に繋がっていて、その内周端は、層間接続導体及び接続導体Ｗ２を介して第２端子電極Ｐ２に繋がっている。第２コイル導体Ｌ２の外周端は第３端子電極Ｐ３に導通していて、その内周端は第１コイル導体Ｌ１の内周端に繋がっている。 The outer peripheral end of the coil conductor of the first coil conductor L1 is connected to the first terminal electrode P1, and the inner peripheral end thereof is connected to the second terminal electrode P2 via the interlayer connection conductor and the connection conductor W2. The outer peripheral end of the second coil conductor L2 is conductive to the third terminal electrode P3, and the inner peripheral end thereof is connected to the inner peripheral end of the first coil conductor L1.

図４に示したように、第１コイル導体Ｌ１と第２コイル導体Ｌ２は同一主面に形成されていてもよい。この構成によれば、第１主面Ｓ１と第２主面Ｓ２とに形成する導体パターンの位置ずれがあっても、第１コイル導体Ｌ１と第２コイル導体Ｌ２との電磁界結合の結合度の変位を抑制できる。 As shown in FIG. 4, the first coil conductor L1 and the second coil conductor L2 may be formed on the same main surface. According to this configuration, even if the conductor patterns formed on the first main surface S1 and the second main surface S2 are displaced, the degree of coupling of the electromagnetic field coupling between the first coil conductor L1 and the second coil conductor L2 is high. Displacement can be suppressed.

図５は、第１の実施形態のアンテナ装置１１１及びそれに接続される回路の回路図である。図１に示した給電回路１の構成を具体的に示している。ここでは、通信相手側のアンテナをインダクタＬ３、共振用キャパシタをＣ３でそれぞれ表している。 FIG. 5 is a circuit diagram of the antenna device 111 of the first embodiment and the circuit connected to the antenna device 111. The configuration of the power supply circuit 1 shown in FIG. 1 is specifically shown. Here, the antenna on the communication partner side is represented by the inductor L3, and the resonance capacitor is represented by C3.

図５に示す例では、インダクタＬ１１，Ｌ１２及びキャパシタＣ２１，Ｃ２２，Ｃ３１，Ｃ３２によって整合回路ＭＣが構成されている。キャパシタＣ１１，Ｃ１２の直列回路は図１に示した第１キャパシタＣ１に相当する。 In the example shown in FIG. 5, the matching circuit MC is composed of the inductors L11 and L12 and the capacitors C21, C22, C31 and C32. The series circuit of the capacitors C11 and C12 corresponds to the first capacitor C1 shown in FIG.

後に示すように、図３や図４に示したコイルアンテナの端子電極Ｐ１，Ｐ２，Ｐ３には、回路基板から突出するピンが当接して電気的に接続される。その回路基板には第１キャパシタＣ１、第２キャパシタＣ２及び給電回路１が設けられている。 As shown later, the pin protruding from the circuit board abuts on the terminal electrodes P1, P2, P3 of the coil antenna shown in FIGS. 3 and 4, and is electrically connected. The circuit board is provided with a first capacitor C1, a second capacitor C2, and a power feeding circuit 1.

本実施形態のアンテナ装置１１１によれば、第１コイル導体Ｌ１と第１キャパシタＣ１とによる共振回路と、第２コイル導体Ｌ２と第２キャパシタＣ２とによる共振回路とを備えるので、単一のコイル導体とキャパシタとによる単一の共振回路を構成したアンテナ装置に比べてアンテナ特性が向上する。その理由は次のとおりである。 According to the antenna device 111 of the present embodiment, since the resonance circuit by the first coil conductor L1 and the first capacitor C1 and the resonance circuit by the second coil conductor L2 and the second capacitor C2 are provided, a single coil is provided. The antenna characteristics are improved as compared with an antenna device in which a single resonant circuit consisting of a conductor and a capacitor is formed. The reason is as follows.

まず、給電回路内のＲＦＩＣを等価抵抗で表すと、この等価抵抗に生じる電圧は第１コイル導体Ｌ１のインダクタンスに依存する。この電圧が最大となる第１コイル導体Ｌ１のインダクタンスが第１コイル導体Ｌ１として最適なインダクタンスである。したがって、第１コイル導体Ｌ１のインダクタンスをあまり大きくできない。 First, when the RFIC in the feeding circuit is represented by an equivalent resistance, the voltage generated in this equivalent resistance depends on the inductance of the first coil conductor L1. The inductance of the first coil conductor L1 at which this voltage is maximized is the optimum inductance for the first coil conductor L1. Therefore, the inductance of the first coil conductor L1 cannot be increased so much.

一方、給電回路に直接接続されない第２コイル導体Ｌ２についてはインダクタンスの制約がないので、そのインダクタンスを大きくすることで共振回路のＱ値を高くすることができる。そして、第２コイル導体Ｌ２側の共振回路のＱ値の向上により、アンテナ装置１１１全体としてのＱ値が高まる。 On the other hand, since there is no restriction on the inductance of the second coil conductor L2 that is not directly connected to the power feeding circuit, the Q value of the resonance circuit can be increased by increasing the inductance. Then, by improving the Q value of the resonance circuit on the second coil conductor L2 side, the Q value of the antenna device 111 as a whole increases.

また、第１の実施形態によれば、次のような作用効果も奏する。 Further, according to the first embodiment, the following actions and effects are also obtained.

・同一の基材上に第１コイル導体Ｌ１と第２コイル導体Ｌ２が構成されるので、コイル導体同士の必要な結合度を確保できる。また、通信相手のコイル導体と第１コイル導体Ｌ１との結合、及び通信相手のコイル導体と第２コイル導体Ｌ２との結合を容易に高めることができる。 -Since the first coil conductor L1 and the second coil conductor L2 are configured on the same base material, the required degree of coupling between the coil conductors can be secured. Further, the connection between the coil conductor of the communication partner and the first coil conductor L1 and the connection between the coil conductor of the communication partner and the second coil conductor L2 can be easily enhanced.

・第１キャパシタＣ１及び第２キャパシタＣ２を、コイル導体が形成されたフレキシブルな基材に搭載する場合に比べて、リジッドな回路基板に搭載することで、チップキャパシタの実装が容易となり、実装の信頼性も向上する。 -Compared to mounting the first capacitor C1 and the second capacitor C2 on a flexible base material on which a coil conductor is formed, mounting the chip capacitor on a rigid circuit board facilitates mounting of the chip capacitor. It also improves reliability.

・コイルアンテナ１０１と回路基板との接続は３つの端子を介して接続するだけであるので、配線部材、例えばコネクタピンの点数を削減できる。また、配線部材を含む接続部の構成に要する空間を削減できる。 -Since the coil antenna 101 and the circuit board are only connected via three terminals, the number of wiring members, for example, connector pins can be reduced. In addition, the space required for the configuration of the connection portion including the wiring member can be reduced.

《第２の実施形態》
第２の実施形態では、第１コイル導体Ｌ１及び第２コイル導体Ｌ２に対するキャパシタの接続関係が第１の実施形態で示した例とは異なるアンテナ装置について示す。 << Second Embodiment >>
In the second embodiment, an antenna device in which the connection relationship of the capacitor to the first coil conductor L1 and the second coil conductor L2 is different from the example shown in the first embodiment is shown.

図６は、第２の実施形態に係るコイルアンテナ、アンテナ装置及び電子機器の回路図である。 FIG. 6 is a circuit diagram of the coil antenna, the antenna device, and the electronic device according to the second embodiment.

図６に示す電子機器２０２は、アンテナ装置１１２と、このアンテナ装置１１２に接続された給電回路１とで構成される。コイルアンテナ１０２は、第１コイル導体Ｌ１と、第２コイル導体Ｌ２と、第１端子電極Ｐ１、第２端子電極Ｐ２及び第３端子電極Ｐ３とを備える。第１コイル導体Ｌ１と第２コイル導体Ｌ２は互いに電磁界結合する。コイルアンテナ１０２の構造例は後に示す。第２の実施形態のアンテナ装置１１２においても、第１端子電極Ｐ１と第２端子電極Ｐ２とに給電回路１が接続される。 The electronic device 202 shown in FIG. 6 includes an antenna device 112 and a power feeding circuit 1 connected to the antenna device 112. The coil antenna 102 includes a first coil conductor L1, a second coil conductor L2, and a first terminal electrode P1, a second terminal electrode P2, and a third terminal electrode P3. The first coil conductor L1 and the second coil conductor L2 are electromagnetically coupled to each other. A structural example of the coil antenna 102 will be shown later. Also in the antenna device 112 of the second embodiment, the power feeding circuit 1 is connected to the first terminal electrode P1 and the second terminal electrode P2.

アンテナ装置１１２は、コイルアンテナ１０２、第１キャパシタＣ１及び第２キャパシタＣ２を備える。第１キャパシタＣ１は第１端子電極Ｐ１と第２端子電極Ｐ２との間に接続され、第２キャパシタＣ２は第１端子電極Ｐ１と第３端子電極Ｐ３との間に接続される。 The antenna device 112 includes a coil antenna 102, a first capacitor C1 and a second capacitor C2. The first capacitor C1 is connected between the first terminal electrode P1 and the second terminal electrode P2, and the second capacitor C2 is connected between the first terminal electrode P1 and the third terminal electrode P3.

図７は第２の実施形態に係るコイルアンテナ１０２の構成を示す主要部の分解斜視図である。図８は、このコイルアンテナ１０２の分解平面図である。 FIG. 7 is an exploded perspective view of a main part showing the configuration of the coil antenna 102 according to the second embodiment. FIG. 8 is an exploded plan view of the coil antenna 102.

第１コイル導体Ｌ１は、基材１１の第１主面Ｓ１に形成されたコイル導体で構成されている。このコイル導体は、第１コイル開口ＣＯ１を有する矩形スパイラル状のコイル導体である。また、第２コイル導体Ｌ２は、第２主面Ｓ２に形成されたコイル導体で構成されている。このコイル導体は、第２コイル開口ＣＯ２を有する矩形スパイラル状のコイル導体である。 The first coil conductor L1 is composed of a coil conductor formed on the first main surface S1 of the base material 11. This coil conductor is a rectangular spiral-shaped coil conductor having a first coil opening CO1. Further, the second coil conductor L2 is composed of a coil conductor formed on the second main surface S2. This coil conductor is a rectangular spiral-shaped coil conductor having a second coil opening CO2.

第１コイル導体Ｌ１のコイル導体の外周端は第１端子電極Ｐ１に繋がっていて、その内周端は第２端子電極Ｐ２に繋がっている。第２コイル導体Ｌ２のコイル導体の外周端は層間接続導体Ｖ３を介して第３端子電極Ｐ３に導通していて、その内周端は層間接続導体Ｖ２を介して第２端子電極Ｐ２に導通している。 The outer peripheral end of the coil conductor of the first coil conductor L1 is connected to the first terminal electrode P1, and the inner peripheral end thereof is connected to the second terminal electrode P2. The outer peripheral end of the coil conductor of the second coil conductor L2 is conducting to the third terminal electrode P3 via the interlayer connecting conductor V3, and the inner peripheral end thereof is conducting to the second terminal electrode P2 via the interlayer connecting conductor V2. ing.

上記基材１１の下面には磁性体シート１０が重ねられている。 A magnetic sheet 10 is laminated on the lower surface of the base material 11.

第１コイル導体Ｌ１のコイル導体の第１端子電極Ｐ１から第２端子電極Ｐ２への巻回方向と、第２コイル導体Ｌ２のコイル導体の第２端子電極Ｐ２から第３端子電極Ｐ３への巻回方向とは同方向である。 The winding direction of the coil conductor of the first coil conductor L1 from the first terminal electrode P1 to the second terminal electrode P2 and the winding of the coil conductor of the second coil conductor L2 from the second terminal electrode P2 to the third terminal electrode P3. The direction of rotation is the same.

第１コイル導体Ｌ１の第１コイル開口ＣＯ１と第２コイル導体Ｌ２の第２コイル開口ＣＯ２とは基材の平面視で重なり、第１コイル導体Ｌ１と第２コイル導体Ｌ２とは磁界結合する。第１コイル導体Ｌ１の第１コイル開口ＣＯ１と第２コイル導体Ｌ２の第２コイル開口ＣＯ２とは基材の平面視で部分的に重なる形態であってもよいが、本実施形態においては、第１コイル導体Ｌ１の第１コイル開口ＣＯ１と第２コイル導体Ｌ２の第２コイル開口ＣＯ２とはほぼ全体が重なるので、第１コイル導体Ｌ１と第２コイル導体Ｌ２との間の結合係数は部分的に重なる形態に比べて高い。 The first coil opening CO1 of the first coil conductor L1 and the second coil opening CO2 of the second coil conductor L2 overlap in a plan view of the base material, and the first coil conductor L1 and the second coil conductor L2 are magnetically coupled. The first coil opening CO1 of the first coil conductor L1 and the second coil opening CO2 of the second coil conductor L2 may partially overlap in a plan view of the base material, but in the present embodiment, the first coil opening CO1 and the second coil opening CO2 of the second coil conductor L2 may partially overlap each other. Since the first coil opening CO1 of the 1 coil conductor L1 and the second coil opening CO2 of the second coil conductor L2 almost overlap with each other, the coupling coefficient between the first coil conductor L1 and the second coil conductor L2 is partial. It is higher than the form that overlaps with.

図９は第２の実施形態に係る別のコイルアンテナ１０２Ａの構成を示す主要部の分解斜視図である。図１０はこのコイルアンテナ１０２Ａの分解平面図である。図１０に示す例では、第１コイル導体Ｌ１は、基材１１の第１主面Ｓ１に形成されたコイル導体で構成されている。このコイル導体は、コイル開口ＣＯを有する矩形スパイラル状のコイル導体である。また、第２コイル導体Ｌ２も、基材１１の第１主面Ｓ１に形成されたコイル導体で構成されている。このコイル導体は、コイル開口ＣＯを有する矩形スパイラル状のコイル導体である。第２主面Ｓ２には接続導体Ｗ２，Ｗ３が形成されている。 FIG. 9 is an exploded perspective view of a main part showing the configuration of another coil antenna 102A according to the second embodiment. FIG. 10 is an exploded plan view of the coil antenna 102A. In the example shown in FIG. 10, the first coil conductor L1 is composed of a coil conductor formed on the first main surface S1 of the base material 11. This coil conductor is a rectangular spiral-shaped coil conductor having a coil opening CO. Further, the second coil conductor L2 is also composed of a coil conductor formed on the first main surface S1 of the base material 11. This coil conductor is a rectangular spiral-shaped coil conductor having a coil opening CO. Connecting conductors W2 and W3 are formed on the second main surface S2.

第１コイル導体Ｌ１のコイル導体の外周端は第１端子電極Ｐ１に繋がっていて、その内周端は、第２コイル導体Ｌ２の外周端に連続的に繋がっている。第２コイル導体Ｌ２の内周端は層間接続導体及び接続導体Ｗ３を介して第３端子電極Ｐ３に繋がっている。第１コイル導体Ｌ１と第２コイル導体Ｌ２の接続点は層間接続導体及び接続導体Ｗ２を介して第２端子電極Ｐ２に導通している。 The outer peripheral end of the coil conductor of the first coil conductor L1 is connected to the first terminal electrode P1, and the inner peripheral end thereof is continuously connected to the outer peripheral end of the second coil conductor L2. The inner peripheral end of the second coil conductor L2 is connected to the third terminal electrode P3 via the interlayer connecting conductor and the connecting conductor W3. The connection point between the first coil conductor L1 and the second coil conductor L2 is conducting to the second terminal electrode P2 via the interlayer connection conductor and the connection conductor W2.

第２の実施形態によれば、第１の実施形態と同様の作用効果を奏する。さらに、第２の実施形態のアンテナ装置１１２によれば、図６に示すように、第１キャパシタＣ１と第１コイル導体Ｌ１とで第１共振回路が構成され、第２キャパシタＣ２、第１コイル導体Ｌ１及び第２コイル導体Ｌ２によって第２共振回路が構成される。つまり、第２共振回路は第１共振回路の第１コイル導体Ｌ１をも利用するので、全体のコイル導体の巻回数が少なくても、第２共振回路のインダクタンス成分（第１コイル導体Ｌ１と第２コイル導体Ｌ２との合成インダクタンス）を効果的に高めることができる。 According to the second embodiment, it has the same effect as that of the first embodiment. Further, according to the antenna device 112 of the second embodiment, as shown in FIG. 6, a first resonance circuit is formed by the first capacitor C1 and the first coil conductor L1, and the second capacitor C2 and the first coil The second resonance circuit is formed by the conductor L1 and the second coil conductor L2. That is, since the second resonance circuit also uses the first coil conductor L1 of the first resonance circuit, the inductance components of the second resonance circuit (first coil conductor L1 and the first coil conductor L1 and the first coil conductor L1) even if the total number of turns of the coil conductor is small. The combined inductance with the two-coil conductor L2) can be effectively increased.

このように、コイル導体の巻回数が少ない割にインダクタンスが大きくなることで、アンテナ装置１１２全体としてのＱ値が高まる。 As described above, the Q value of the antenna device 112 as a whole increases because the inductance increases for the small number of turns of the coil conductor.

《第３の実施形態》
第３の実施形態では、磁性体シート１０、第１コイル導体Ｌ１及び第２コイル導体Ｌ２の関係が第１、第２の実施形態とは異なるコイルアンテナの例を示す。 << Third Embodiment >>
In the third embodiment, an example of a coil antenna in which the relationship between the magnetic sheet 10, the first coil conductor L1 and the second coil conductor L2 is different from that of the first and second embodiments is shown.

図１１（Ａ）は、第３の実施形態に係るコイルアンテナ１０３の平面図であり、図１１（Ｂ）はその下面図である。図１２は第３の実施形態に係るコイルアンテナ１０３の分解平面図である。 FIG. 11A is a plan view of the coil antenna 103 according to the third embodiment, and FIG. 11B is a bottom view thereof. FIG. 12 is an exploded plan view of the coil antenna 103 according to the third embodiment.

第１コイル導体Ｌ１及び第２コイル導体Ｌ２は、基材１１の第１主面Ｓ１に形成されたコイル導体で構成されている。このコイル導体は、コイル開口ＣＯを有する矩形スパイラル状のコイル導体である。第２主面Ｓ２には接続導体Ｗ２が形成されている。基材１１には磁性体シート１０が挿入されるスリットＳＬが形成されている。 The first coil conductor L1 and the second coil conductor L2 are composed of coil conductors formed on the first main surface S1 of the base material 11. This coil conductor is a rectangular spiral-shaped coil conductor having a coil opening CO. A connecting conductor W2 is formed on the second main surface S2. A slit SL into which the magnetic sheet 10 is inserted is formed in the base material 11.

磁性体シート１０は第１主面ＭＳ１及び第２主面ＭＳ２を有し、第１コイル導体Ｌ１及び第２コイル導体Ｌ２は第１導体部ＣＰ１及び第２導体部ＣＰ２を有する。第１コイル導体Ｌ１及び第２コイル導体Ｌ２の第１導体部ＣＰ１は、磁性体シート１０の第１主面ＭＳ１側に設けられる。また、第１コイル導体Ｌ１及び第２コイル導体Ｌ２の第２導体部ＣＰ２は磁性体シート１０の第２主面ＭＳ２側に設けられる。 The magnetic sheet 10 has a first main surface MS1 and a second main surface MS2, and the first coil conductor L1 and the second coil conductor L2 have a first conductor portion CP1 and a second conductor portion CP2. The first conductor portion CP1 of the first coil conductor L1 and the second coil conductor L2 is provided on the first main surface MS1 side of the magnetic material sheet 10. Further, the second conductor portion CP2 of the first coil conductor L1 and the second coil conductor L2 is provided on the second main surface MS2 side of the magnetic material sheet 10.

磁性体シート１０の第１主面ＭＳ１の平面視で第１導体部ＣＰ１と第２導体部ＣＰ２とは重ならない。 The first conductor portion CP1 and the second conductor portion CP2 do not overlap in the plan view of the first main surface MS1 of the magnetic sheet 10.

第３の実施形態によれば、第１コイル導体Ｌ１及び第２コイル導体Ｌ２のコイル開口に磁性体シート１０が挿入される構造であるので、第１コイル導体Ｌ１及び磁性体シート１０による第１コイルアンテナの指向性と、第２コイル導体Ｌ２及び磁性体シート１０による第２コイルアンテナの指向性を、第１の実施形態とは異なる方向にもたせることができる。 According to the third embodiment, since the magnetic material sheet 10 is inserted into the coil openings of the first coil conductor L1 and the second coil conductor L2, the first coil conductor L1 and the magnetic material sheet 10 are used for the first. The directionalness of the coil antenna and the directionalness of the second coil antenna by the second coil conductor L2 and the magnetic material sheet 10 can be made to be in a direction different from that of the first embodiment.

《第４の実施形態》
第４の実施形態では、磁性体シート１０、第１コイル導体Ｌ１及び第２コイル導体Ｌ２の関係が第３の実施形態とは更に異なるコイルアンテナの例を示す。 << Fourth Embodiment >>
The fourth embodiment shows an example of a coil antenna in which the relationship between the magnetic sheet 10, the first coil conductor L1 and the second coil conductor L2 is further different from that of the third embodiment.

図１３（Ａ）は、第４の実施形態に係るコイルアンテナ１０４の平面図であり、図１３（Ｂ）はその下面図である。図１４は第４の実施形態に係るコイルアンテナ１０４の分解平面図である。 13 (A) is a plan view of the coil antenna 104 according to the fourth embodiment, and FIG. 13 (B) is a bottom view thereof. FIG. 14 is an exploded plan view of the coil antenna 104 according to the fourth embodiment.

第１コイル導体Ｌ１及び第２コイル導体Ｌ２は、基材１１の第１主面Ｓ１に形成されたコイル導体で構成されている。このコイル導体は、コイル開口を有する矩形スパイラル状のコイル導体である。第２主面Ｓ２には接続導体Ｗ２，Ｗ３が形成されている。基材１１には磁性体シート１０が挿入される二つのスリットＳＬが形成されている。 The first coil conductor L1 and the second coil conductor L2 are composed of coil conductors formed on the first main surface S1 of the base material 11. This coil conductor is a rectangular spiral coil conductor having a coil opening. Connecting conductors W2 and W3 are formed on the second main surface S2. Two slits SL into which the magnetic sheet 10 is inserted are formed in the base material 11.

磁性体シート１０は第１主面ＭＳ１及び第２主面ＭＳ２を有し、第２コイル導体Ｌ２は第１導体部ＣＰ１及び第２導体部ＣＰ２を有する。第２コイル導体Ｌ２の第１導体部ＣＰ１は磁性体シート１０の第１主面ＭＳ１側に設けられる。また、第２コイル導体Ｌ２の第２導体部ＣＰ２は磁性体シート１０の第２主面ＭＳ２側に設けられる。磁性体シート１０の第１主面ＭＳ１の平面視で第１導体部ＣＰ１と第２導体部ＣＰ２とは重ならない。 The magnetic sheet 10 has a first main surface MS1 and a second main surface MS2, and the second coil conductor L2 has a first conductor portion CP1 and a second conductor portion CP2. The first conductor portion CP1 of the second coil conductor L2 is provided on the first main surface MS1 side of the magnetic sheet 10. Further, the second conductor portion CP2 of the second coil conductor L2 is provided on the second main surface MS2 side of the magnetic sheet 10. The first conductor portion CP1 and the second conductor portion CP2 do not overlap in the plan view of the first main surface MS1 of the magnetic sheet 10.

一方、第１コイル導体Ｌ１は第１コイル導体部ＣＰ３及び第２コイル導体部ＣＰ４を有する。第１コイル導体Ｌ１の第１コイル導体部ＣＰ３および第１コイル導体Ｌ１の第２コイル導体部ＣＰ４は磁性体シート１０の第１主面ＭＳ１側に設けられる。磁性体シート１０の第１主面ＭＳ１の平面視で第１コイル導体部ＣＰ３と第２コイル導体部ＣＰ４とは重ならない。第１コイル導体Ｌ１は、基材の平面視で磁性体シート１０と重なる領域において、磁性体シート１０の第１主面ＭＳ１側又は第２主面ＭＳ２側のどちらか一方のみに設けられる。 On the other hand, the first coil conductor L1 has a first coil conductor portion CP3 and a second coil conductor portion CP4. The first coil conductor portion CP3 of the first coil conductor L1 and the second coil conductor portion CP4 of the first coil conductor L1 are provided on the first main surface MS1 side of the magnetic material sheet 10. The first coil conductor portion CP3 and the second coil conductor portion CP4 do not overlap in the plan view of the first main surface MS1 of the magnetic sheet 10. The first coil conductor L1 is provided only on either the first main surface MS1 side or the second main surface MS2 side of the magnetic material sheet 10 in the region where the magnetic material sheet 10 overlaps with the magnetic material sheet 10 in the plan view of the base material.

本実施形態のコイルアンテナ１０４は、第２コイル導体Ｌ２のコイル開口に磁性体シート１０が挿入され、第１コイル導体Ｌ１に磁性体シート１０が重ねられた構造である。 The coil antenna 104 of the present embodiment has a structure in which the magnetic material sheet 10 is inserted into the coil opening of the second coil conductor L2, and the magnetic material sheet 10 is superposed on the first coil conductor L1.

第４の実施形態によれば、第１コイル導体Ｌ１のコイル巻回軸は基材に直交する方向であり、第２コイル導体Ｌ２のコイル巻回軸は基材に対する直交方向から傾けることができ、このことにより、第１コイル導体Ｌ１と第２コイル導体Ｌ２とで、異なる指向性をもたせることができる。 According to the fourth embodiment, the coil winding axis of the first coil conductor L1 is in the direction orthogonal to the base material, and the coil winding axis of the second coil conductor L2 can be tilted from the direction orthogonal to the base material. As a result, the first coil conductor L1 and the second coil conductor L2 can have different directivity.

《第５の実施形態》
第５の実施形態では、電子機器内に設けられたアンテナ装置の構成について示す。 << Fifth Embodiment >>
In the fifth embodiment, the configuration of the antenna device provided in the electronic device is shown.

図１５（Ａ）、図１５（Ｂ）は、第５の実施形態に係る電子機器の内部の構成を示す平面図である。 15 (A) and 15 (B) are plan views showing the internal configuration of the electronic device according to the fifth embodiment.

図１５（Ａ）はコイルアンテナの実装前の電子機器の筐体内部の構成を示す平面図である。図１５（Ｂ）は電子機器の筐体内部にコイルアンテナ１０３を実装前した状態を示す平面図である。筐体内にはバッテリーパック４や回路基板５が設けられている。コイルアンテナ１０３は筐体内の上部ケースの内面に貼付されていて、回路基板５から突出するピンが端子電極に当接するが、図１５（Ｂ）においてはコイルアンテナ１０３を分離して図示している。 FIG. 15A is a plan view showing the configuration inside the housing of the electronic device before mounting the coil antenna. FIG. 15B is a plan view showing a state in which the coil antenna 103 is not mounted inside the housing of the electronic device. A battery pack 4 and a circuit board 5 are provided in the housing. The coil antenna 103 is attached to the inner surface of the upper case inside the housing, and a pin protruding from the circuit board 5 abuts on the terminal electrode. However, in FIG. 15B, the coil antenna 103 is shown separately. ..

コイルアンテナ１０３は図１１（Ｂ）に示したコイルアンテナであり、第１コイル導体Ｌ１及び第２コイル導体Ｌ２の指向性は、図１５（Ｂ）において矢印で示す方向を向く。つまり、結合相手のコイル導体のコイル開口の中心に対して、電子機器２０５を±Ｘ軸方向に移動させたとき、結合の強さのピークはコイルアンテナ１０３の位置より電子機器２０５の筐体の中心方向へずれる。そのため、本実施形態のように、コイルアンテナ１０３の実装位置が筐体のＸ軸方向の中央からずれて実装される場合でも、操作性は良好に保てる。 The coil antenna 103 is the coil antenna shown in FIG. 11 (B), and the directivity of the first coil conductor L1 and the second coil conductor L2 points in the direction indicated by the arrow in FIG. 15 (B). That is, when the electronic device 205 is moved in the ± X-axis direction with respect to the center of the coil opening of the coil conductor of the coupling partner, the peak of the coupling strength is from the position of the coil antenna 103 to the housing of the electronic device 205. It shifts toward the center. Therefore, even when the mounting position of the coil antenna 103 is deviated from the center in the X-axis direction of the housing as in the present embodiment, good operability can be maintained.

最後に、上述の実施形態の説明は、すべての点で例示であって、制限的なものではない。当業者にとって変形及び変更が適宜可能である。本発明の範囲は、上述の実施形態ではなく、特許請求の範囲によって示される。さらに、本発明の範囲には、特許請求の範囲内と均等の範囲内での実施形態からの変更が含まれる。 Finally, the description of the embodiments described above is exemplary in all respects and is not restrictive. Modifications and changes can be made as appropriate for those skilled in the art. The scope of the present invention is shown not by the above-described embodiment but by the scope of claims. Further, the scope of the present invention includes modifications from the embodiment within the scope of the claims and within the scope of the claims.

Ｃ１…第１キャパシタ
Ｃ２…第２キャパシタ
Ｃ１１，Ｃ１２，Ｃ２１，Ｃ２２，Ｃ３１，Ｃ３２…キャパシタ
ＣＯ…コイル開口
ＣＯ１…第１コイル開口
ＣＯ２…第２コイル開口
ＣＰ１…第１導体部
ＣＰ２…第２導体部
Ｌ１…第１コイル導体
Ｌ２…第２コイル導体
Ｌ１１，Ｌ１２，Ｌ３…インダクタ
ＭＣ…整合回路
ＭＳ１…磁性体シートの第１主面
ＭＳ２…磁性体シートの第２主面
Ｐ１…第１端子電極
Ｐ２…第２端子電極
Ｐ３…第３端子電極
１１…基材
Ｓ１…基材の第１主面
Ｓ２…基材の第２主面
ＳＬ…スリット
Ｖ２，Ｖ３…層間接続導体
Ｗ２，Ｗ３…接続導体
１…給電回路
４…バッテリーパック
５…回路基板
１０…磁性体シート
１０１，１０２，１０２Ａ，１０３，１０４…コイルアンテナ
１１１，１１２…アンテナ装置
２０１，２０２，２０５…電子機器 C1 ... 1st capacitor C2 ... 2nd capacitor C11, C12, C21, C22, C31, C32 ... Capacitor CO ... Coil opening CO1 ... 1st coil opening CO2 ... 2nd coil opening CP1 ... 1st conductor part CP2 ... 2nd conductor Part L1 ... First coil conductor L2 ... Second coil conductor L11, L12, L3 ... Capacitor MC ... Matching circuit MS1 ... First main surface of magnetic material sheet MS2 ... Second main surface of magnetic material sheet P1 ... First terminal electrode P2 ... 2nd terminal electrode P3 ... 3rd terminal electrode 11 ... Base material S1 ... First main surface of base material S2 ... Second main surface of base material SL ... Slit V2, V3 ... Interlayer connecting conductor W2, W3 ... Connecting conductor 1 ... Power supply circuit 4 ... Battery pack 5 ... Circuit board 10 ... Magnetic sheet 101, 102, 102A, 103, 104 ... Coil antenna 111, 112 ... Antenna device 201, 202, 205 ... Electronic equipment

Claims (9)

絶縁性の基材と、
前記基材に形成され、第１コイル開口を有する第１コイル導体と、
前記基材に形成され、第２コイル開口を有する第２コイル導体と、
前記基材に形成された、第１端子電極、第２端子電極及び第３端子電極と、
を備え、
前記第１コイル導体は前記第１端子電極と前記第２端子電極との間に接続され、
前記第２コイル導体は前記第２端子電極と前記第３端子電極との間に接続され、
前記基材の平面視で、前記第１コイル開口と前記第２コイル開口とは互いに重なり、
前記第１コイル導体と前記第２コイル導体とは互いに磁界結合し、
前記第１端子電極と前記第２端子電極とに給電回路が接続される、
コイルアンテナ。 Insulating base material and
A first coil conductor formed on the base material and having a first coil opening,
A second coil conductor formed on the base material and having a second coil opening,
The first terminal electrode, the second terminal electrode, and the third terminal electrode formed on the base material,
With
The first coil conductor is connected between the first terminal electrode and the second terminal electrode.
The second coil conductor is connected between the second terminal electrode and the third terminal electrode.
In the plan view of the base material, the first coil opening and the second coil opening overlap each other.
The first coil conductor and the second coil conductor are magnetically coupled to each other.
A power supply circuit is connected to the first terminal electrode and the second terminal electrode.
Coil antenna. 前記第１コイル導体及び前記第２コイル導体は、前記基材の単一の主面に形成されたコイル導体パターンで構成される、
請求項１に記載のコイルアンテナ。 The first coil conductor and the second coil conductor are composed of a coil conductor pattern formed on a single main surface of the base material.
The coil antenna according to claim 1. 互いに対向する第１主面及び第２主面を有し、前記基材に対向し、前記基材の平面視で前記第１コイル開口及び前記第２コイル開口に重なる磁性体を備える、
請求項１又は２に記載のコイルアンテナ。 A magnetic material having a first main surface and a second main surface facing each other, facing the base material, and overlapping the first coil opening and the second coil opening in a plan view of the base material.
The coil antenna according to claim 1 or 2. 前記第２コイル導体は、前記磁性体の第１主面側に設けられる第１導体部と、前記磁性体の第２主面側に設けられる第２導体部と、を有し、
前記磁性体の第１主面の平面視で前記第１導体部と前記第２導体部とは重ならない、
請求項３に記載のコイルアンテナ。 The second coil conductor has a first conductor portion provided on the first main surface side of the magnetic material and a second conductor portion provided on the second main surface side of the magnetic material.
The first conductor portion and the second conductor portion do not overlap in a plan view of the first main surface of the magnetic material.
The coil antenna according to claim 3. 前記第１コイル導体の前記磁性体と重なる領域は、前記基材の平面視で、前記磁性体の第１主面側又は第２主面側のいずれか一方に設けられる、
請求項４に記載のコイルアンテナ。 The region of the first coil conductor that overlaps with the magnetic material is provided on either the first main surface side or the second main surface side of the magnetic material in a plan view of the base material.
The coil antenna according to claim 4. 請求項１から５のいずれかに記載のコイルアンテナと、
前記基材に対向する回路基板と、
前記回路基板に配置された第１キャパシタと、
前記回路基板に配置された第２キャパシタと、
を備え、
前記第１キャパシタは前記第１端子電極と前記第２端子電極との間に接続され、
前記第２キャパシタは前記第２端子電極と前記第３端子電極との間に接続された、
アンテナ装置。 The coil antenna according to any one of claims 1 to 5.
The circuit board facing the base material and
The first capacitor arranged on the circuit board and
The second capacitor arranged on the circuit board and
With
The first capacitor is connected between the first terminal electrode and the second terminal electrode.
The second capacitor was connected between the second terminal electrode and the third terminal electrode.
Antenna device. 請求項１から５のいずれかに記載のコイルアンテナと、
前記基材に対向する回路基板と、
前記回路基板に配置された第１キャパシタと、
前記回路基板に配置された第２キャパシタと、
を備え、
前記第１キャパシタは前記第１端子電極と前記第２端子電極との間に接続され、
前記第２キャパシタは前記第１端子電極と前記第３端子電極との間に接続された、
アンテナ装置。 The coil antenna according to any one of claims 1 to 5.
The circuit board facing the base material and
The first capacitor arranged on the circuit board and
The second capacitor arranged on the circuit board and
With
The first capacitor is connected between the first terminal electrode and the second terminal electrode.
The second capacitor was connected between the first terminal electrode and the third terminal electrode.
Antenna device. 前記第１コイル導体と前記第１キャパシタは第１共振回路を構成し、前記第２コイル導体と前記第２キャパシタは第２共振回路を構成する、
請求項６または７に記載のアンテナ装置。 The first coil conductor and the first capacitor form a first resonance circuit, and the second coil conductor and the second capacitor form a second resonance circuit.
The antenna device according to claim 6 or 7. 請求項６から８のいずれかに記載のアンテナ装置と、前記回路基板に設けられた前記給電回路とを備える電子機器。 An electronic device including the antenna device according to any one of claims 6 to 8 and the power feeding circuit provided on the circuit board.

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