JP2010232820A - Antenna device - Google Patents
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Abstract
Description
本発明は、小型無線機に内蔵されるアンテナ装置に関し、特に、アンテナインピーダンス調整のための無給電素子を有するアンテナ装置に関する。 The present invention relates to an antenna device built in a small wireless device, and more particularly to an antenna device having a parasitic element for antenna impedance adjustment.
近年、携帯電話に代表される各種通信機器では、ＧＳＭやＵＭＴＳといった異なる通信システムを単一の機器において利用するサービスが提供されている。そのため、それぞれの通信システムに対応したアンテナが必要になる。この場合、機器内のアンテナスペースには限りがあるため、ひとつのアンテナでいくつもの通信システムに対応できるような複数の共振を持たせられる方が望ましい。 In recent years, various communication devices represented by mobile phones have provided services that use different communication systems such as GSM and UMTS in a single device. Therefore, an antenna corresponding to each communication system is required. In this case, since the antenna space in the device is limited, it is desirable to have a plurality of resonances so that one antenna can support several communication systems.
そこで、特許文献１及び２には、複数の共振をもつアンテナ構造として、無給電素子を付加したアンテナに係る発明が開示されている。 Therefore, Patent Documents 1 and 2 disclose inventions related to an antenna to which a parasitic element is added as an antenna structure having a plurality of resonances.
特許文献１のアンテナは、同一基板の同一辺上に給電素子と無給電素子とを並列的に設置したもので、給電素子と無給電素子との開放端は共に同一方向を向いている。 In the antenna of Patent Document 1, a feeding element and a parasitic element are installed in parallel on the same side of the same substrate, and both open ends of the feeding element and the parasitic element are directed in the same direction.
特許文献２のアンテナは図１２に示すように装置基板１０上にアンテナ素子２１と無給電素子２２とが設けられ、それぞれの開放端同士が近接する構成になっている。図１２は特許文献２に開示されている関連技術に相当するアンテナの構造図である。 As shown in FIG. 12, the antenna of Patent Document 2 is provided with an antenna element 21 and a parasitic element 22 on a device substrate 10, and the open ends thereof are close to each other. FIG. 12 is a structural diagram of an antenna corresponding to the related art disclosed in Patent Document 2.
ここで、複数共振のアンテナ装置で、例えば特許文献１及び２に示すような無給電素子を付加したアンテナ装置において、複数の共振周波数が目的の周波数になるようにするには、集中定数を用いて調整する例が挙げられる。これは集中定数によってアンテナ素子や無給電素子に流れこむ電流を制御できるからである。 Here, in a multi-resonance antenna device, for example, in an antenna device to which a parasitic element as shown in Patent Documents 1 and 2 is added, a lumped constant is used to set a plurality of resonance frequencies to a target frequency. An example of adjustment is given. This is because the current flowing into the antenna element and the parasitic element can be controlled by the lumped constant.
しかしながら、特許文献１及び２に開示されたアンテナ装置では、それぞれの共振にアンテナ素子と無給電素子が起因していて、単純に集中定数を装荷できない。すなわち、ひとつの素子だけがアンテナとして動作しているわけではないので、例えば二つの共振を実現しようとした場合、もう一方の共振周波数も変動してしまう。 However, in the antenna devices disclosed in Patent Documents 1 and 2, the antenna element and the parasitic element are attributed to the respective resonances, and a lumped constant cannot be simply loaded. That is, since only one element does not operate as an antenna, for example, when two resonances are to be realized, the other resonance frequency also fluctuates.
このため、一方の周波数を調整するために、単純に一方の共振周波数のみを考えて給電素子側に集中定数回路を装荷すると、それによって、アンテナ素子と無給電素子によって形成されたもう一方の共振周波数が変動してしまう。 For this reason, in order to adjust one frequency, simply considering only one resonance frequency and loading a lumped constant circuit on the feeding element side, the other resonance formed by the antenna element and the parasitic element is thereby obtained. The frequency will fluctuate.
かかる問題を解決するには、集中定数回路の複雑化が不可避であり、加えて、集中定数回路を装荷するためにはんだ接続などの作業も煩雑であることや、集中定数自体に損失性があるという課題もあった。 In order to solve such a problem, it is inevitable that the lumped constant circuit is complicated. In addition, the operation of solder connection or the like is complicated to load the lumped constant circuit, and the lumped constant itself has a loss. There was also a problem.
本発明は上記に鑑みてなされたものであり、無給電素子によって周波数調整可能なアンテナ装置に関し、特に複数の共振に対しそれぞれに簡易な手段で周波数調整が可能なアンテナ装置を提供することを目的とする。 The present invention has been made in view of the above, and relates to an antenna device capable of frequency adjustment by a parasitic element, and particularly to provide an antenna device capable of frequency adjustment by simple means for each of a plurality of resonances. And
上述の問題を解決するため、本発明に係るアンテナ装置は、方形の地板の一辺上に、電力が供給される給電点と、該給電点で前記一辺上に設置されるＬ字型のアンテナ素子と、前記アンテナ素子とはそれぞれの開放端を近接させて相対するように前記一辺上に設置されるＬ字型の無給電素子とを有するアンテナ装置において、前記一辺上に、前記アンテナ素子に近接するように、かつ前記アンテナ素子の外側に平行に沿うように配置された別個の無給電素子を備え、前記一辺と直行する前記地板の辺の長さは使用周波数の四分の一波長以上であり、前記アンテナ素子のＬ字部分の長さである素子長は前記使用周波数の五分の一波長であり、前記アンテナ素子と前記無給電素子との前記一辺上の設置部分の間隔は、前記アンテナ素子と前記別個の無給電素子との前記一辺上の設置部分間の間隔よりも広いことを特徴とする。 In order to solve the above-described problem, an antenna device according to the present invention includes a feeding point where power is supplied on one side of a rectangular ground plane, and an L-shaped antenna element installed on the one side at the feeding point. And an antenna device having an L-shaped parasitic element placed on the one side so that the open ends of the antenna element are opposed to each other, and the antenna element is close to the antenna element on the one side And a separate parasitic element arranged parallel to the outside of the antenna element, and the length of the side of the ground plane perpendicular to the one side is a quarter wavelength or more of the operating frequency. Yes, the element length, which is the length of the L-shaped portion of the antenna element, is one-fifth wavelength of the operating frequency, and the spacing between the antenna element and the parasitic element on the one side is Separate from antenna element Wider than the spacing between said mounting portion on one side of the parasitic element and said.
本発明によれば、別個の無給電素子により特に複数の共振に対しそれぞれに簡易な手段で周波数調整が可能なアンテナ装置を提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, the antenna apparatus which can adjust a frequency by a simple means especially with respect to several resonance with a separate parasitic element can be provided.
［第１の実施の形態］
以下、本発明の第１の実施の形態について図を用いて説明する。なお、本実施の形態では、無線端末の一例として折畳み式通信端末装置を例にとって説明する。
[First Embodiment]
The first embodiment of the present invention will be described below with reference to the drawings. In the present embodiment, a foldable communication terminal device will be described as an example of a wireless terminal.
図１は、本発明の第１の実施の形態におけるアンテナ装置の模式図である。この図１によると、本実施の形態のアンテナ装置は、方形の地板１と、電力が供給される給電点２と、アンテナ素子３と、第１の無給電素子４０と、第２の無給電素子４１と、を備える。 FIG. 1 is a schematic diagram of an antenna device according to a first embodiment of the present invention. According to FIG. 1, the antenna device of the present embodiment includes a rectangular ground plane 1, a feeding point 2 to which power is supplied, an antenna element 3, a first parasitic element 40, and a second parasitic power. And an element 41.
地板１の１辺に対して、線状Ｌ型のアンテナ素子３と、第１の無給電素子４０と、第２の無給電素子４１とが取り付けられた構成である。 A linear L-shaped antenna element 3, a first parasitic element 40, and a second parasitic element 41 are attached to one side of the ground plane 1.
アンテナ素子３は地板１の端部に給電点２で給電され、第１の無給電素子４０は反対側の端部に無給電で接続されている。又、第２の無給電素子４１は、アンテナ素子３よりも外側の端部に無給電で接続されている。 The antenna element 3 is fed to the end portion of the ground plane 1 at a feeding point 2, and the first parasitic element 40 is connected to the opposite end portion without feeding. In addition, the second parasitic element 41 is connected to the end portion outside the antenna element 3 without a parasitic power.
アンテナ素子３と第１の無給電素子４０はＬ型が対向するように配置され、地板との接続端と反対側が開放端で、近接していることが望ましい。又、第２の無給電素子４１はアンテナ素子３に近接するように、かつアンテナ素子３の外側に平行に沿うように配置された構成となっている。 It is desirable that the antenna element 3 and the first parasitic element 40 are disposed so that the L-type faces each other, and the side opposite to the connection end with the ground plane is an open end and is close to the antenna element 3. Further, the second parasitic element 41 is arranged so as to be close to the antenna element 3 and parallel to the outside of the antenna element 3.
このとき、アンテナ素子３のＬ字部分の長さである素子長Ｌ２は、使用周波数のλ／５であり、地板１の素子の接する辺と直行する辺の長さＬ１はλ／４以上であり、又、アンテナ素子３と第１の無給電素子４０との接続点間隔Ｄ２は、アンテナ素子３と第２の無給電素子４１との間隔Ｄ１よりも広くなっていることが好ましい。この構成で、第２の無給電素子４１の上辺の長さＬ３を変化することにより、周波数の調整が可能となる。 At this time, the element length L2, which is the length of the L-shaped portion of the antenna element 3, is λ / 5 of the operating frequency, and the length L1 of the side perpendicular to the side of the ground plane 1 that is in contact with the element is λ / 4 or more. In addition, the connection point interval D2 between the antenna element 3 and the first parasitic element 40 is preferably larger than the interval D1 between the antenna element 3 and the second parasitic element 41. With this configuration, the frequency can be adjusted by changing the length L3 of the upper side of the second parasitic element 41.
Ｌ３の長さは、０＜Ｌ３＜Ｄ１又はＤ１＜Ｌ３で規定され、前者の場合は高域の共振周波数を、後者の場合は低域の共振周波数を調整可能とする。 The length of L3 is defined by 0 <L3 <D1 or D1 <L3. In the former case, the resonance frequency of the high frequency band can be adjusted, and in the latter case, the resonance frequency of the low frequency band can be adjusted.
なお、図ではアンテナ素子の接続辺を地板の短辺としている、Ｌ１の長さがλ／４であれば素子を長辺に接続しても構わない。更に、第２の無給電素子４１はアンテナ素子３の外側に沿うように配置しているが、端部内側で接続し、内側に配置しても構わない。又、ここではアンテナ素子３、第１の無給電素子４０、第２の無給電素子４１に線状素子をもちいているが、幅が細い板状の素子でも構わない。 In the figure, the connection side of the antenna element is the short side of the ground plane. If the length of L1 is λ / 4, the element may be connected to the long side. Furthermore, although the second parasitic element 41 is arranged along the outside of the antenna element 3, it may be connected inside the end portion and arranged inside. Further, although linear elements are used here for the antenna element 3, the first parasitic element 40, and the second parasitic element 41, a plate-like element having a narrow width may be used.
［第１の実施の形態の動作の説明］
図２、図３に、本実施の形態にかかるアンテナ装置の共振周波数の変化を示す。一例として、４０ｍｍ×８０ｍｍの地板に対してＤ１を６ｍｍ、Ｄ２を２８ｍｍ、Ｌ１を８０ｍｍ、Ｌ２を２３ｍｍ（高さ９＋幅１４）としたとき、第２の無給電素子長を変化させている。
[Description of Operation of First Embodiment]
2 and 3 show changes in the resonance frequency of the antenna device according to the present embodiment. As an example, when the D1 is 6 mm, the D2 is 28 mm, the L1 is 80 mm, and the L2 is 23 mm (height 9 + width 14) with respect to a ground plate of 40 mm × 80 mm, the second parasitic element length is changed.
図２は、横軸を周波数、縦軸を反射損失とし、第２の無給電素子４１の上辺の長さＬ３が、アンテナ素子３と第２の無給電素子４１との間隔Ｄ１よりも短い場合の反射特性の計算結果を示している。計算結果は、第２の無給電素子４１の長さを１３ｍｍ（Ｌ３＝０ｍｍ）と１８ｍｍ（Ｌ３＝５ｍｍ）でそれぞれ行っている。又、比較のために、第２の無給電素子を付加していない共振周波数調整前の状態の特性も示す。 FIG. 2 shows a case where the horizontal axis represents frequency, the vertical axis represents reflection loss, and the length L3 of the upper side of the second parasitic element 41 is shorter than the distance D1 between the antenna element 3 and the second parasitic element 41. The calculation results of the reflection characteristics are shown. As a result of the calculation, the length of the second parasitic element 41 is 13 mm (L3 = 0 mm) and 18 mm (L3 = 5 mm), respectively. For comparison, the characteristics of the state before adjusting the resonance frequency without adding the second parasitic element are also shown.
この図２に示すように、第２の無給電素子４１を付加していない状態で２共振であり、第２の無給電素子４１を付加しＬ３の長さがＤ１よりも短いとき、低域がほとんど変化しないのに対して高域側の共振周波数が大きく変動している。したがって、第２の無給電素子のＬ３の長さがＤ１よりも短いときに高域の共振周波数を調整可能である。 As shown in FIG. 2, when the second parasitic element 41 is not added and there are two resonances, and the second parasitic element 41 is added and the length of L3 is shorter than D1, However, the resonance frequency on the high frequency side fluctuates greatly. Therefore, when the length of L3 of the second parasitic element is shorter than D1, the high-band resonance frequency can be adjusted.
図３は、横軸を周波数、縦軸を反射損失とし、第２の無給電素子４１の上部Ｌ３が、アンテナ素子３と第２の無給電素子４１間隔Ｄ１よりも長い場合の反射特性の計算結果を示している。計算結果は第２の無給電素子４１の長さを２４ｍｍ（Ｌ３＝１１ｍｍ）と３２ｍｍ（Ｌ３＝１９ｍｍ）でそれぞれ行っている。 In FIG. 3, the horizontal axis represents the frequency, the vertical axis represents the reflection loss, and the reflection characteristic is calculated when the upper portion L3 of the second parasitic element 41 is longer than the distance D1 between the antenna element 3 and the second parasitic element 41. Results are shown. As a result of the calculation, the length of the second parasitic element 41 is 24 mm (L3 = 11 mm) and 32 mm (L3 = 19 mm).
又、図２と同様、比較のために第２の無給電素子を付加していない状態の特性も示す。図に示すように、Ｌ３がＤ１よりも長く第２の無給電素子長を変化することにより、高域がほとんど変化していないのに対して低域側の共振周波数が変動している。したがって、第２の無給電素子のＬ３の長さがＤ１よりも長いときに低域の共振周波数を調整可能である。 Further, as in FIG. 2, the characteristics in the state where the second parasitic element is not added are also shown for comparison. As shown in the figure, when L3 is longer than D1 and the second parasitic element length is changed, the resonance frequency on the low frequency side fluctuates while the high frequency is hardly changed. Therefore, when the length of L3 of the second parasitic element is longer than D1, the low-band resonance frequency can be adjusted.
すなわち、第２の無給電素子４０の開放端の位置を調整することによって、共振周波数の高域や低域を調整可能となる。 That is, by adjusting the position of the open end of the second parasitic element 40, the high frequency range and low frequency range of the resonance frequency can be adjusted.
［第２の実施の形態］
以下に、第２の実施の形態について図４を用いて説明する。図４は、本発明の第２の実施の形態におけるアンテナ装置の模式図である。
[Second Embodiment]
Hereinafter, a second embodiment will be described with reference to FIG. FIG. 4 is a schematic diagram of an antenna device according to the second embodiment of the present invention.
この図４によると、本実施の形態のアンテナ装置は、方形の地板１と、電力が供給される給電点２と、アンテナ素子３と、第１の無給電素子４０と、第２の無給電素子４１と、アンテナ導通切替えスイッチ５と、を備える。 According to FIG. 4, the antenna device of the present embodiment includes a rectangular ground plane 1, a feeding point 2 to which power is supplied, an antenna element 3, a first parasitic element 40, and a second parasitic element. An element 41 and an antenna conduction switch 5 are provided.
地板１の１辺に対して、線状Ｌ型のアンテナ素子３と、第１の無給電素子４０と、第２の無給電素子４１とが取り付けられた構成である。 A linear L-shaped antenna element 3, a first parasitic element 40, and a second parasitic element 41 are attached to one side of the ground plane 1.
アンテナ素子３は地板１の端部に給電点２で給電され、第１の無給電素子４０は反対側の端部に無給電で接続されている。又、第２の無給電素子４１は、アンテナ素子３よりも外側の端部に無給電で接続されている。 The antenna element 3 is fed to the end portion of the ground plane 1 at a feeding point 2, and the first parasitic element 40 is connected to the opposite end portion without feeding. In addition, the second parasitic element 41 is connected to the end portion outside the antenna element 3 without a parasitic power.
アンテナ素子３と第１の無給電素子４０は対向するように配置され、地板との接続端と反対側が開放端で、近接していることが望ましい。又、第２の無給電素子４１は前記アンテナ素子３に近接するように、かつアンテナ素子３の外側に平行に沿うように配置された構成となっている。 It is desirable that the antenna element 3 and the first parasitic element 40 are disposed so as to face each other, and the side opposite to the connection end with the ground plane is an open end and is close to the antenna element 3. The second parasitic element 41 is arranged so as to be close to the antenna element 3 and parallel to the outside of the antenna element 3.
又、アンテナ導通切替えスイッチが、第２の無給電素子４１の折れ曲がれ部から長さＤ１の箇所（Ｌ４＝Ｄ１）、すなわちちょうど給電点２の真上に位置する箇所に設けられる構成とする。アンテナ導通切り替えスイッチの例としては、ダイオードスイッチなどが挙げられる。 In addition, the antenna conduction changeover switch is provided at a position (L4 = D1) having a length D1 from the bent portion of the second parasitic element 41, that is, a position located just above the feeding point 2. An example of the antenna conduction switching switch is a diode switch.
アンテナ素子３のＬ字部分の長さである素子長は、使用周波数のλ／５であり、地板１の素子の接する辺と直行する辺の長さはλ／４以上であり、又、アンテナ素子３と第１の無給電素子４０との接続点間隔は、アンテナ素子３と第２の無給電素子４１との間隔よりも広くなっていることが好ましい。 The element length, which is the length of the L-shaped portion of the antenna element 3, is λ / 5 of the operating frequency, and the length of the side perpendicular to the side of the ground plane 1 that is in contact with the element is λ / 4 or more. The connection point interval between the element 3 and the first parasitic element 40 is preferably wider than the interval between the antenna element 3 and the second parasitic element 41.
すなわち、この導通スイッチによって第２の無給電素子の電気長を切り替えることができ、これによって共振周波数を変化させることができる。 That is, the electrical length of the second parasitic element can be switched by this conduction switch, and thereby the resonance frequency can be changed.
このアンテナ導通切り替えスイッチを複数個設けてもよい。図５は、アンテナ導通切り替えスイッチを第２の無給電素子上に複数個設置した状態を示す模式図である。このように第２の無給電素子４１上に複数のアンテナ導通切り替えスイッチ５を持たせることで、素子の長さを電気的に可変にし、周波数のより精密な調製が可能となる。 A plurality of antenna conduction changeover switches may be provided. FIG. 5 is a schematic diagram showing a state in which a plurality of antenna conduction changeover switches are installed on the second parasitic element. Thus, by providing the plurality of antenna conduction changeover switches 5 on the second parasitic element 41, the length of the element can be electrically varied, and the frequency can be adjusted more precisely.
なお、ここではアンテナ素子３、第１の無給電素子４０、第２の無給電素子４１に線状素子をもちいているが、幅が細い板状の素子でも構わない。 Here, linear elements are used for the antenna element 3, the first parasitic element 40, and the second parasitic element 41, but a plate-like element having a narrow width may be used.
［第３−１の実施の形態］
以下に、第３−１の実施形態例について図６を用いて説明する。図６は、本発明の第３−１の実施の形態におけるアンテナ装置の模式図である。
[Third embodiment]
Below, the 3rd-1 example of an embodiment is demonstrated using FIG. FIG. 6 is a schematic diagram of an antenna device according to the 3-1 embodiment of the present invention.
この図６によると、本実施の形態のアンテナ装置は、方形の地板１、電力が供給される給電点２、アンテナ素子３、第１の無給電素子４０及び第２の無給電素子４１を備える。 According to FIG. 6, the antenna device of the present embodiment includes a rectangular ground plane 1, a feeding point 2 to which power is supplied, an antenna element 3, a first parasitic element 40, and a second parasitic element 41. .
地板１の一辺に対して、線状Ｌ型のアンテナ素子３と、第１の無給電素子４０と、第２の無給電素子４１とが取り付けられた構成である。 A linear L-shaped antenna element 3, a first parasitic element 40, and a second parasitic element 41 are attached to one side of the ground plane 1.
アンテナ素子３は地板１の端部に給電点２で給電され、第１の無給電素子４０は反対側の端部に無給電で接続されている。又、第２の無給電素子４１は、アンテナ素子３よりも外側の端部に無給電で接続されている。 The antenna element 3 is fed to the end portion of the ground plane 1 at a feeding point 2, and the first parasitic element 40 is connected to the opposite end portion without feeding. In addition, the second parasitic element 41 is connected to the end portion outside the antenna element 3 without a parasitic power.
アンテナ素子３と第１の無給電素子４０は対向するように配置され、地板との接続端と反対側が開放端で、近接していることが望ましい。又、第２の無給電素子４１はアンテナ素子３に近接するように、かつアンテナ素子３の外側に平行に沿うように配置された構成となっている。ここまでは、第１の実施の形態と同様である。 It is desirable that the antenna element 3 and the first parasitic element 40 are disposed so as to face each other, and the side opposite to the connection end with the ground plane is an open end and is close to the antenna element 3. Further, the second parasitic element 41 is arranged so as to be close to the antenna element 3 and parallel to the outside of the antenna element 3. The process up to this point is the same as in the first embodiment.
本実施の形態では、アンテナ素子３及び無給電素子４０、無給電素子４１は、地板１の水平面に対して同一面内に配置される。この構成により、筐体に取り付けられるアンテナ装置によって厚みが増えることはなく薄型化につながる。 In the present embodiment, the antenna element 3, the parasitic element 40, and the parasitic element 41 are arranged in the same plane with respect to the horizontal plane of the ground plane 1. With this configuration, the antenna device attached to the housing does not increase in thickness and leads to a reduction in thickness.
［第３−２の実施の形態］
以下に、第３−２の実施形態例について図７を用いて説明する。図７は、本発明の第３−２の実施の形態におけるアンテナ装置の模式図である。
[Third Embodiment]
Hereinafter, a third to second exemplary embodiment will be described with reference to FIG. FIG. 7 is a schematic diagram of the antenna device according to the third to second embodiments of the present invention.
この図７によると、本実施の形態のアンテナ装置は、地板１、給電点２、アンテナ素子３、第１の無給電素子４０及び第２の無給電素子４１を備える。 According to FIG. 7, the antenna device of the present embodiment includes a ground plane 1, a feeding point 2, an antenna element 3, a first parasitic element 40, and a second parasitic element 41.
地板１の一辺に対して、線状Ｌ型のアンテナ素子３と、第１の無給電素子４０と、第２の無給電素子４１とが取り付けられた構成である。アンテナ素子３は地板１の端部に給電点２で給電され、第１の無給電素子４０は反対側の端部に無給電で接続されている。又、第２の無給電素子４１は、アンテナ素子３よりも外側の端部に無給電で接続されている。 A linear L-shaped antenna element 3, a first parasitic element 40, and a second parasitic element 41 are attached to one side of the ground plane 1. The antenna element 3 is fed to the end portion of the ground plane 1 at a feeding point 2, and the first parasitic element 40 is connected to the opposite end portion without feeding. In addition, the second parasitic element 41 is connected to the end portion outside the antenna element 3 without a parasitic power.
アンテナ素子３と第１の無給電素子４０は対向するように配置され、地板との接続端と反対側が開放端で、近接していることが望ましい。又、第２の無給電素子４１は前記アンテナ素子３に近接するように、かつアンテナ素子３の外側に平行に沿うように配置された構成となっている。ここまでは、第１の実施の形態と同様である。 It is desirable that the antenna element 3 and the first parasitic element 40 are disposed so as to face each other, and the side opposite to the connection end with the ground plane is an open end and is close to the antenna element 3. The second parasitic element 41 is arranged so as to be close to the antenna element 3 and parallel to the outside of the antenna element 3. The process up to this point is the same as in the first embodiment.
本実施の形態では、アンテナ素子３、第１の無給電素子４０、第２の無給電素子４１は地板１の水平面に対して傾斜をかけて設置する。この構成により、アンテナの高さ方向の距離に制約があるときに、傾斜にすることで素子長を長くすることができ、低い周波数への適応範囲を広げることが可能となる。 In the present embodiment, the antenna element 3, the first parasitic element 40, and the second parasitic element 41 are installed with an inclination with respect to the horizontal plane of the ground plane 1. With this configuration, when the distance in the height direction of the antenna is limited, the element length can be increased by inclining, and the adaptive range to a low frequency can be widened.
［第４の実施の形態］
次に、本発明の第４の実施の形態例について図８を用いて説明する。図８は、本発明の第４の実施の形態におけるアンテナ装置の模式図である。
[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 8 is a schematic diagram of an antenna device according to the fourth embodiment of the present invention.
この図８によると、本実施の形態のアンテナ装置は、方形の地板１、電力が供給される給電点２、アンテナ素子３、第１の無給電素子４０及び第２の無給電素子４１を備える。 According to FIG. 8, the antenna device of the present embodiment includes a rectangular ground plane 1, a feeding point 2 to which power is supplied, an antenna element 3, a first parasitic element 40, and a second parasitic element 41. .
アンテナ素子３は、メインの信号素子３１と、地板１と信号素子３１に接続する短絡素子３２とによって横転したＦ字型のアンテナの構成になっている。 The antenna element 3 has a configuration of an F-shaped antenna that is rolled over by the main signal element 31 and the ground plane 1 and the short-circuit element 32 connected to the signal element 31.
地板１の一辺に対して、横転したＦ字型のアンテナ素子３と、第１の無給電素子４０と、第２の無給電素子４１とが取り付けられた構成である。信号素子３１は、地板１の端部に給電点２で給電され、短絡素子３２は、信号素子３１と地板１を短絡している。 In this configuration, an overturned F-shaped antenna element 3, a first parasitic element 40, and a second parasitic element 41 are attached to one side of the ground plane 1. The signal element 31 is fed to the end of the ground plane 1 at the feeding point 2, and the short-circuit element 32 short-circuits the signal element 31 and the ground plane 1.
第１の無給電素子４０は沿うように一端をグランドと接続しもう一端を開放端として地板１に接続され、その開放端は、アンテナ素子３の開放端に対向してることが好ましい。このとき、第１の無給電素子４０の開放端側は、第２の無給電素子４１の近傍まで延びる形状でもよい。 The first parasitic element 40 is preferably connected to the ground plate 1 with one end connected to the ground and the other end as an open end, and the open end faces the open end of the antenna element 3. At this time, the open end side of the first parasitic element 40 may have a shape extending to the vicinity of the second parasitic element 41.
第１の無給電素子４０はアンテナ素子３の端部とは反対側の端部に無給電で接続されている。又、第２の無給電素子４１は、アンテナ素子３よりも外側の端部に無給電で接続されている。アンテナ素子３と第１の無給電素子４０は対向するように配置され、地板との接続端と反対側が開放端で、近接していることが望ましい。又、第２の無給電素子４１は前記アンテナ素子３に近接するように、かつアンテナ素子３の内側に平行に沿うように配置された構成となっている。 The first parasitic element 40 is connected to the end opposite to the end of the antenna element 3 without any parasitic. In addition, the second parasitic element 41 is connected to the end portion outside the antenna element 3 without a parasitic power. It is desirable that the antenna element 3 and the first parasitic element 40 are disposed so as to face each other, and the side opposite to the connection end with the ground plane is an open end and is close to the antenna element 3. The second parasitic element 41 is arranged so as to be close to the antenna element 3 and parallel to the inside of the antenna element 3.
これにより、メインのアンテナ素子が逆Ｆ形状であることから共振周波数がひとつ追加され、広帯域化につながる。 As a result, since the main antenna element has an inverted F shape, one resonance frequency is added, leading to a wider band.
［第５の実施の形態］
次に、本発明の第５の実施の形態例について図９を用いて説明する。図９は、本発明の第５の実施の形態におけるアンテナ装置の模式図である。
[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described with reference to FIG. FIG. 9 is a schematic diagram of an antenna device according to the fifth embodiment of the present invention.
この図９によると、本実施の形態のアンテナ装置は、方形の地板１、電力が供給される給電点２、アンテナ素子３、第１の無給電素子４０及び第２の無給電素子４４を備える。地板１の１辺に対して、線状Ｌ型のアンテナ素子３と、第１の無給電素子４０と、第２の無給電素子４４とが取り付けられた構成である。 According to FIG. 9, the antenna device of the present embodiment includes a rectangular ground plane 1, a feeding point 2 to which power is supplied, an antenna element 3, a first parasitic element 40, and a second parasitic element 44. . In this configuration, a linear L-shaped antenna element 3, a first parasitic element 40, and a second parasitic element 44 are attached to one side of the ground plane 1.
アンテナ素子３は地板１の端部に給電点２で給電され、第１の無給電素子４０は反対側の端部に無給電で接続されている。又、第２の無給電素子４４は、アンテナ素子３よりも外側の端部に無給電で接続されている。 The antenna element 3 is fed to the end portion of the ground plane 1 at a feeding point 2, and the first parasitic element 40 is connected to the opposite end portion without feeding. Further, the second parasitic element 44 is connected to the end portion outside the antenna element 3 without a parasitic power.
アンテナ素子３と第１の無給電素子４０は対向するように配置され、地板との接続端と反対側が開放端で、近接していることが望ましい。又、第２の無給電素子４４は前記アンテナ素子３に近接するように、かつアンテナ素子３の外側に平行に沿うように配置された構成となっていて、第２の無給電素子４４の構造は、ジグザグに蛇行したメアンダ構造にすることも可能である。又、メアンダ構造だけでなく、ヘリカル状に何度も巻いてもよい。 It is desirable that the antenna element 3 and the first parasitic element 40 are disposed so as to face each other, and the side opposite to the connection end with the ground plane is an open end and is close to the antenna element 3. Further, the second parasitic element 44 is arranged so as to be close to the antenna element 3 and parallel to the outside of the antenna element 3, and the structure of the second parasitic element 44. Can also be a meander structure meandering in a zigzag manner. In addition to the meander structure, it may be wound many times in a helical shape.
これによって、第２の無給電素子の電流経路長が長くなり、共振周波数の変化も大きくすることが可能である。 As a result, the current path length of the second parasitic element is increased, and the change in the resonance frequency can be increased.
なお、アンテナ素子３のＬ字部分の長さである素子長は、使用周波数のλ／５であり、地板１の素子の接する辺と直行する辺の長さはλ／４以上であり、又、アンテナ素子３と第１の無給電素子４０との接続点間隔は、アンテナ素子３と第２の無給電素子４４との間隔よりも広くなっていることが好ましい。 The element length, which is the length of the L-shaped portion of the antenna element 3, is λ / 5 of the operating frequency, and the length of the side perpendicular to the side of the ground plane 1 that is in contact with the element is λ / 4 or more. The distance between the connection points between the antenna element 3 and the first parasitic element 40 is preferably larger than the distance between the antenna element 3 and the second parasitic element 44.
［第６の実施の形態］
次に、本発明の第６の実施の形態例について図１０を用いて説明する。図１０は、本発明の第６の実施の形態におけるアンテナ装置の模式図である。
[Sixth Embodiment]
Next, a sixth embodiment of the present invention will be described with reference to FIG. FIG. 10 is a schematic diagram of an antenna device according to the sixth embodiment of the present invention.
この図１０によると、本実施の形態のアンテナ装置は、方形の地板１、電力が供給される給電点２、アンテナ素子３、第１の無給電素子４０、第２の無給電素子４１及びヒンジ金具６を備える。地板１の一辺に対して、線状Ｌ型のアンテナ素子３と、第１の無給電素子４０と、第２の無給電素子４５とが取り付けられた構成である。 Referring to FIG. 10, the antenna device of the present embodiment includes a rectangular ground plane 1, a feeding point 2 to which power is supplied, an antenna element 3, a first parasitic element 40, a second parasitic element 41, and a hinge. A metal fitting 6 is provided. A linear L-type antenna element 3, a first parasitic element 40, and a second parasitic element 45 are attached to one side of the ground plane 1.
アンテナ素子３は地板１の端部に給電点２で給電され、第１の無給電素子４０は反対側の端部に無給電で接続されている。又、第２の無給電素子４５は、アンテナ素子３よりも外側の端部に無給電で接続されている。 The antenna element 3 is fed to the end portion of the ground plane 1 at a feeding point 2, and the first parasitic element 40 is connected to the opposite end portion without feeding. The second parasitic element 45 is connected to the outer end of the antenna element 3 without a parasitic power.
アンテナ素子３と第１の無給電素子４０は対向するように配置され、地板との接続端と反対側が開放端で、近接していることが望ましい。 It is desirable that the antenna element 3 and the first parasitic element 40 are disposed so as to face each other, and the side opposite to the connection end with the ground plane is an open end and is close to the antenna element 3.
又、第２の無給電素子４５は前記アンテナ素子３に近接するように、かつアンテナ素子３の外側に平行に沿うように配置されている。又、第２の無給電素子４５は、地板との接続端との反対端が折畳式携帯端末に代表されるようなヒンジ金具の一部と電気的に接続されている。 The second parasitic element 45 is arranged so as to be close to the antenna element 3 and parallel to the outside of the antenna element 3. In addition, the second parasitic element 45 is electrically connected to a part of a hinge fitting represented by a foldable mobile terminal at the opposite end to the connection end with the ground plane.
図１０に示すように、無給電素子が携帯端末内の構造物であるヒンジ金具６に接続することで、無給電素子長が長くなり、別の周波数帯を増やすことが可能となる。 As shown in FIG. 10, when the parasitic element is connected to the hinge fitting 6 that is a structure in the portable terminal, the parasitic element length is increased, and another frequency band can be increased.
なお、アンテナ素子３のＬ字部分の長さである素子長は、使用周波数のλ／５であり、地板１の素子の接する辺と直行する辺の長さはλ／４以上であり、又、アンテナ素子３と第１の無給電素子４０との接続点間隔は、アンテナ素子３と第２の無給電素子４５との間隔よりも広くなっていることが好ましい。 The element length, which is the length of the L-shaped portion of the antenna element 3, is λ / 5 of the operating frequency, and the length of the side perpendicular to the side of the ground plane 1 that is in contact with the element is λ / 4 or more. The distance between the connection points between the antenna element 3 and the first parasitic element 40 is preferably larger than the distance between the antenna element 3 and the second parasitic element 45.
［第７の実施の形態］
次に、本発明の第７の実施の形態例について図１１を用いて説明する。図１１は、本発明の第６の実施の形態におけるアンテナ装置の模式図である。
[Seventh Embodiment]
Next, a seventh embodiment of the present invention will be described with reference to FIG. FIG. 11 is a schematic diagram of an antenna device according to a sixth embodiment of the present invention.
この図１１によると、本実施の形態のアンテナ装置は、方形の地板１と、電力が供給される給電点２と、アンテナ素子３と、第１の無給電素子４０と、第２の無給電素子４１と、短絡素子７と、を備える。地板１の１辺に対して、線状Ｌ型のアンテナ素子３と、第１の無給電素子４０と、第２の無給電素子４１とが取り付けられた構成である。 According to FIG. 11, the antenna device of the present embodiment includes a rectangular ground plane 1, a feeding point 2 to which power is supplied, an antenna element 3, a first parasitic element 40, and a second parasitic element. An element 41 and a short-circuit element 7 are provided. A linear L-shaped antenna element 3, a first parasitic element 40, and a second parasitic element 41 are attached to one side of the ground plane 1.
アンテナ素子３は地板１の端部に給電点２で給電され、第１の無給電素子４０は反対側の端部に無給電で接続されている。又、第２の無給電素子４１は、アンテナ素子３よりも外側の端部に無給電で接続されている。アンテナ素子３と第１の無給電素子４０は対向するように配置され、地板との接続端と反対側が開放端で、近接していることが望ましい。 The antenna element 3 is fed to the end portion of the ground plane 1 at a feeding point 2, and the first parasitic element 40 is connected to the opposite end portion without feeding. In addition, the second parasitic element 41 is connected to the end portion outside the antenna element 3 without a parasitic power. It is desirable that the antenna element 3 and the first parasitic element 40 are disposed so as to face each other, and the side opposite to the connection end with the ground plane is an open end and is close to the antenna element 3.
又、第２の無給電素子４１は前記アンテナ素子３に近接するように、かつアンテナ素子３の外側に平行に沿うように配置された構成となっている。 The second parasitic element 41 is arranged so as to be close to the antenna element 3 and parallel to the outside of the antenna element 3.
この前記第１の無給電素子４０と前記第２の無給電素子４１との間に短絡素子６を設けることで、電流経路が追加され、広帯域になる可能性がある。 By providing the short-circuit element 6 between the first parasitic element 40 and the second parasitic element 41, there is a possibility that a current path is added and a broadband is obtained.
なお、アンテナ素子３のＬ字部分の長さである素子長は、使用周波数のλ／５であり、地板１の素子の接する辺と直行する辺の長さはλ／４以上であり、又、アンテナ素子３と第１の無給電素子４０との接続点間隔は、アンテナ素子３と第２の無給電素子４１との間隔よりも広くなっていることが好ましい。 The element length, which is the length of the L-shaped portion of the antenna element 3, is λ / 5 of the operating frequency, and the length of the side perpendicular to the side of the ground plane 1 that is in contact with the element is λ / 4 or more. The distance between the connection points between the antenna element 3 and the first parasitic element 40 is preferably larger than the distance between the antenna element 3 and the second parasitic element 41.
本発明にかかるアンテナ装置は、無給電素子によって周波数を調整することができるという効果を有し、特に携帯電話などの薄型化が望まれるような移動体通信機器用途に利用することができる。 The antenna device according to the present invention has an effect that the frequency can be adjusted by a parasitic element, and can be used particularly for mobile communication equipment applications such as cellular phones where thinning is desired.
１ 地板
２ 給電点
３ アンテナ素子
５ アンテナ導通切り替えスイッチ
６ ヒンジ金具
７ 短絡素子
１０ 装置基板
２１ アンテナ素子
２２ 無給電素子
３１ 信号素子
３２ 短絡素子
４０ 第１の無給電素子
４１ 第２の無給電素子
４４ 第２の無給電素子
４５ 第２の無給電素子
DESCRIPTION OF SYMBOLS 1 Ground plane 2 Feeding point 3 Antenna element 5 Antenna conduction | electrical_connection changeover switch 6 Hinge metal fitting 7 Short circuit 10 Device board 21 Antenna element 22 Parasitic element 31 Signal element 32 Short element 40 1st parasitic element 41 2nd parasitic element 44 Second parasitic element 45 Second parasitic element
Claims (12)
前記一辺上に、前記アンテナ素子に近接するように、かつ前記アンテナ素子の外側に平行に沿うように配置された別個の無給電素子を備え、
前記一辺と直行する前記地板の辺の長さは使用周波数の四分の一波長以上であり、前記アンテナ素子のＬ字部分の長さである素子長は前記使用周波数の五分の一波長であり、前記アンテナ素子と前記無給電素子との前記一辺上の設置部分の間隔は、前記アンテナ素子と前記別個の無給電素子との前記一辺上の設置部分間の間隔よりも広いことを特徴とするアンテナ装置。 On one side of the square ground plane, a feeding point where power is supplied, an L-shaped antenna element installed on the one side at the feeding point, and the antenna element are relative to each other with their open ends close to each other. In the antenna device having an L-shaped parasitic element installed on the one side as described above,
On the one side, a separate parasitic element is disposed so as to be close to the antenna element and parallel to the outside of the antenna element,
The length of the side of the ground plane orthogonal to the one side is a quarter wavelength or more of the use frequency, and the element length which is the length of the L-shaped portion of the antenna element is a fifth wavelength of the use frequency. And an interval between the antenna elements and the parasitic elements on the one side is wider than an interval between the antenna elements and the individual parasitic elements on the one side. Antenna device to do.
前記別個の無給電素子は、前記ヒンジ金具に電気的に接続されることを特徴とする請求項１に記載のアンテナ装置。 The antenna device is used for a portable terminal having a hinge fitting,
The antenna device according to claim 1, wherein the separate parasitic element is electrically connected to the hinge fitting.
前記アンテナ素子は、前記一辺と平行な部分と前記一辺とを接続する短絡素子を備えることで横転したＦ字型を呈し、
前記一辺上に、前記アンテナ素子に近接するように、かつ前記アンテナ素子の内側に平行に沿うように配置された別個の無給電素子を備えることを特徴とするアンテナ装置。 On one side of the square ground plane, a feeding point where power is supplied, an L-shaped antenna element installed on the one side at the feeding point, and the antenna element are relative to each other with their open ends close to each other. In the antenna device having an L-shaped parasitic element installed on the one side as described above,
The antenna element has an F-shaped rollover by including a short-circuit element that connects the part parallel to the one side and the one side,
An antenna apparatus comprising: a separate parasitic element disposed on the one side so as to be close to the antenna element and parallel to the inside of the antenna element.
前記一辺上に、前記アンテナ素子に近接するように、かつ前記アンテナ素子の内側に平行に沿うように配置されたＬ字型の別個の無給電素子を備え、
前記一辺と直行する前記地板の辺の長さは使用周波数の四分の一波長以上であり、前記アンテナ素子のＬ字部分の長さである素子長は前記使用周波数の五分の一波長であり、前記アンテナ素子と前記無給電素子との前記一辺上の設置部分の間隔は、前記アンテナ素子と前記別個の無給電素子との前記一辺上の設置部分間の間隔よりも広いことを特徴とするアンテナ装置。 On one side of the square ground plane, a feeding point where power is supplied, an L-shaped antenna element installed on the one side at the feeding point, and the antenna element are relative to each other with their open ends close to each other. In the antenna device having an L-shaped parasitic element installed on the one side as described above,
On the one side, provided with an L-shaped separate parasitic element disposed so as to be close to the antenna element and parallel to the inside of the antenna element,
The length of the side of the ground plane orthogonal to the one side is a quarter wavelength or more of the use frequency, and the element length which is the length of the L-shaped portion of the antenna element is a fifth wavelength of the use frequency. And an interval between the antenna elements and the parasitic elements on the one side is wider than an interval between the antenna elements and the individual parasitic elements on the one side. Antenna device to do.
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