JP2010028182A - Antenna apparatus capable of suppressing inter-coupling among antenna elements - Google Patents
Antenna apparatus capable of suppressing inter-coupling among antenna elements Download PDFInfo
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本発明はアンテナ装置に関し、特に、アンテナエレメント間の相互結合を抑制可能なアンテナ装置に関する。 The present invention relates to an antenna device, and more particularly to an antenna device capable of suppressing mutual coupling between antenna elements.
近来、マルチバンド化や種々の用途に用いられるために、携帯端末や無線ネットワーク装置内等で複数のアンテナが用いられている。限られたスペースに複数のアンテナが収容されると、アンテナエレメント間に相互結合が生じ、アンテナ利得の低下や指向性の乱れが生じ得る。 In recent years, a plurality of antennas have been used in mobile terminals, wireless network devices, and the like for use in multi-band and various applications. When a plurality of antennas are accommodated in a limited space, mutual coupling occurs between the antenna elements, which may cause a decrease in antenna gain and disturbance in directivity.
このような相互結合を防止するために、従来から種々の相互結合量の抑制手法が考えられてきた。例えば、個々のパッチアンテナエレメントを金属壁で覆う手法、パッチアンテナエレメント間にスロット（凹状溝等）を設ける手法等が存在する。 In order to prevent such mutual coupling, various methods for suppressing the amount of mutual coupling have been conventionally considered. For example, there are a method of covering individual patch antenna elements with metal walls, a method of providing slots (concave grooves or the like) between the patch antenna elements, and the like.
また、モノポールアンテナにおいて、地板が有限の場合、地板表面に流れる電流が地板端部で回折する影響により地板表面に電磁波の放射が生じ、これがアンテナ利得の低下や指向性の乱れを生じ得るという問題もあった。これを解決するものとして、例えば特許文献１には、地板表面にＥＢＧ（Ｅｌｅｃｔｒｏｍａｇｎｅｔｉｃ Ｂａｎｄ Ｇａｐ）素子を等間隔に配置して、地板表面の電磁波の伝搬を抑制したものが開示されている。 In a monopole antenna, when the ground plane is finite, electromagnetic current is radiated on the ground plane due to the influence of the current flowing on the ground plane diffracting at the edge of the ground plane, which can cause a decrease in antenna gain and disturbance of directivity. There was also a problem. As a solution to this problem, for example, Patent Document 1 discloses a technique in which EBG (Electromagnetic Band Gap) elements are arranged at equal intervals on the ground plane surface to suppress propagation of electromagnetic waves on the ground plane surface.
従来のアンテナエレメント間の相互結合量の抑制については、金属壁の高さやスロットの高さの分、装置が大きくなってしまうという問題があった。また、パッチアンテナエレメントの放射指向性は、パッチアンテナエレメント上面側に向いているものであり、複数のパッチアンテナエレメントの相互結合は主に地板表面を介して生じるものであった。そこで、ＥＢＧ素子を用いて地板表面の電磁波の伝搬を抑制することにより、このようなパッチアンテナエレメント間の相互結合を抑制することはある程度可能であった。 Regarding the suppression of the mutual coupling amount between the conventional antenna elements, there has been a problem that the apparatus becomes larger by the height of the metal wall and the height of the slot. Further, the radiation directivity of the patch antenna element is directed to the upper surface side of the patch antenna element, and the mutual coupling of the plurality of patch antenna elements mainly occurs via the ground plane surface. Therefore, it has been possible to some extent to suppress such mutual coupling between patch antenna elements by suppressing propagation of electromagnetic waves on the surface of the ground plane using an EBG element.
しかしながら、モノポールアンテナエレメントの場合、放射指向性はアンテナの垂直方向だけでなく水平方向にも向いているため、複数のモノポールアンテナエレメントを用いた場合には、地板表面を介した相互結合は抑制できたとしても、アンテナエレメント自体の間の相互結合を十分に抑制できていなかった。 However, in the case of a monopole antenna element, the radiation directivity is oriented not only in the vertical direction but also in the horizontal direction of the antenna. Therefore, when multiple monopole antenna elements are used, mutual coupling via the ground plane surface is not Even if it could be suppressed, the mutual coupling between the antenna elements themselves could not be sufficiently suppressed.
本発明は、斯かる実情に鑑み、アンテナエレメント間の相互結合を十分に抑制可能なアンテナ装置を提供しようとするものである。 In view of such a situation, the present invention intends to provide an antenna device capable of sufficiently suppressing mutual coupling between antenna elements.
上述した本発明の目的を達成するために、本発明による２以上のアンテナエレメント間の相互結合を抑制可能なアンテナ装置は、有限地板に平行な放射部を有し、有限地板上に１／２波長分間隔を置いて夫々平行且つ同一方向に配置される一対のアンテナエレメントと、有限地板上且つ一対のアンテナエレメント間に配置される複数のＥＢＧ素子であって、該複数のＥＢＧ素子は、一対のアンテナエレメントのターゲット周波数がバンドギャップ内に包含されるように設計され、一対のアンテナエレメントの放射部の長手方向に３行且つ短辺方向に２列のマトリックス状に配置される、複数のＥＢＧ素子と、を具備するものである。 In order to achieve the above-described object of the present invention, an antenna device capable of suppressing mutual coupling between two or more antenna elements according to the present invention has a radiating portion parallel to a finite ground plane and is ½ on the finite ground plane. A pair of antenna elements arranged in parallel and in the same direction with a wavelength interval, and a plurality of EBG elements arranged on a finite ground plane and between the pair of antenna elements, the plurality of EBG elements being a pair A plurality of EBGs designed so that the target frequencies of the antenna elements are included in the band gap and arranged in a matrix of 3 rows in the longitudinal direction and 2 columns in the short side direction of the radiating portion of the pair of antenna elements And an element.
ここで、一対のアンテナエレメントの各給電点は、２行目に配置されるＥＢＧ素子の中心点間を結ぶ線の延長線である中心線上から放射部側にＥＢＧ素子の１／２配置周期分ずらした位置上から、中心線上から放射部と反対側にＥＢＧ素子の１／４配置周期分ずらした位置上の範囲内に配置されれば良い。 Here, each feeding point of the pair of antenna elements is a ½ arrangement period of the EBG element from the center line, which is an extension of the line connecting the center points of the EBG elements arranged in the second row, to the radiating portion side. What is necessary is just to arrange | position in the range on the position shifted by the 1/4 arrangement period of the EBG element from the position shifted on the opposite side to the radiation | emission part from the centerline.
また、一対のアンテナエレメントの各給電点は、中心線上、又は中心線上から放射部側にＥＢＧ素子の１／２配置周期分ずらした位置上、又は中心線上から放射部と反対側にＥＢＧ素子の１／４配置周期分ずらした位置上の何れかに配置されれば良い。 In addition, each feeding point of the pair of antenna elements is located on the center line, on the position shifted from the center line to the radiating part by the 1/2 arrangement period of the EBG element, or on the opposite side of the radiating part from the center line. What is necessary is just to arrange | position at the position on the position shifted by 1/4 arrangement | positioning period.
また、一対のアンテナエレメントは、逆Ｆアンテナエレメント、又は逆Ｌアンテナエレメントであれば良い。 Further, the pair of antenna elements may be an inverted F antenna element or an inverted L antenna element.
さらに、ＥＢＧ素子は、正方形のパッチ素子であれば良い。 Furthermore, the EBG element may be a square patch element.
本発明のアンテナ装置には、アンテナエレメント間の相互結合を抑制可能であるという利点がある。 The antenna device of the present invention has an advantage that mutual coupling between antenna elements can be suppressed.
以下、本発明を実施するための最良の形態を図示例と共に説明する。図１は、本発明のアンテナ装置の構成を説明するための図であり、図１（ａ）はその上面図を、図１（ｂ）はその正面図を、図１（ｃ）はその側面図を表している。図示の通り、本発明のアンテナ装置は、有限地板１上に配置された、一対のアンテナエレメント１１，１２とＥＢＧ（Ｅｌｅｃｔｒｏｍａｇｎｅｔｉｃ Ｂａｎｄ Ｇａｐ）構造２０とから構成されている。 The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a diagram for explaining the configuration of an antenna device according to the present invention. FIG. 1 (a) is a top view, FIG. 1 (b) is a front view, and FIG. 1 (c) is a side view. The figure is shown. As shown in the figure, the antenna device of the present invention includes a pair of antenna elements 11 and 12 and an EBG (Electromagnetic Band Gap) structure 20 disposed on the finite ground plane 1.
一対のアンテナエレメント１１，１２の例として、有限地板１に平行な放射部を有している逆Ｆアンテナエレメントが図示されている。また一対のアンテナエレメント１１，１２は、有限地板１上に１／２波長分間隔を置いてそれぞれ平行且つ同一方向に配置されている。即ち、各アンテナエレメントの放射部が同一方向を向いており、その放射部間の距離がアンテナエレメントのターゲット周波数の波長の１／２となるように配置されている。 As an example of the pair of antenna elements 11 and 12, an inverted F antenna element having a radiating portion parallel to the finite ground plane 1 is illustrated. Further, the pair of antenna elements 11 and 12 are arranged on the finite ground plane 1 in parallel and in the same direction at intervals of ½ wavelength. That is, the radiating portions of the antenna elements are oriented in the same direction, and the distance between the radiating portions is arranged to be ½ of the wavelength of the target frequency of the antenna elements.
アンテナエレメントのターゲット周波数が、例えば２ＧＨｚ帯となるように設計された逆Ｆアンテナエレメントは、例えば以下のような寸法である。即ち、直径１ｍｍの銅線により構成され、有限地板に平行な放射部の長さが３８ｍｍ、垂直方向の高さ（給電線の長さ）が６ｍｍ、給電点から短絡点までの距離が５ｍｍである。 The inverted-F antenna element designed so that the target frequency of the antenna element is, for example, 2 GHz band has the following dimensions, for example. That is, it is composed of a copper wire with a diameter of 1 mm, the length of the radiation part parallel to the finite ground plane is 38 mm, the vertical height (the length of the feed line) is 6 mm, and the distance from the feed point to the short-circuit point is 5 mm. is there.
なお、図示例のアンテナエレメントとして、逆Ｆアンテナエレメントを示したが、本発明のアンテナエレメントはこれに限定されず、有限地板に平行な放射部を有するアンテナ構造であれば、例えば逆Ｌアンテナエレメント等、種々のアンテナエレメントを適用可能である。また、図示例の逆Ｆアンテナエレメントでは、放射部の端部から有限地板側に延びる線を給電線とし、放射部の途中から有限地板側に延びる線を短絡線として示したが、本発明はこれに限定されず、給電線と短絡線を逆に配置しても勿論構わない。 In addition, although the reverse F antenna element was shown as an antenna element of the example of illustration, the antenna element of this invention is not limited to this, If it is an antenna structure which has a radiation | emission part parallel to a finite ground plane, for example, an inverted L antenna element Various antenna elements can be applied. Also, in the inverted F antenna element of the illustrated example, the line extending from the end of the radiating portion to the finite ground plane side is shown as a feed line, and the line extending from the middle of the radiating portion to the finite ground plane side is shown as a short-circuit line. Of course, the power supply line and the short-circuit line may be arranged in reverse.
次に、ＥＢＧ構造２０について説明する。ＥＢＧ構造２０は、６つのＥＢＧ素子２１−２６から構成されており、これらが一対のアンテナエレメント１１，１２間に配置されている。複数のＥＢＧ素子２１−２６は、一対のアンテナエレメント１１，１２のターゲット周波数がバンドギャップ内に包含されるように設計されるものである。また、複数のＥＢＧ素子２１−２６は、図示のように、一対のアンテナエレメント１１，１２の放射部の長手方向に３行且つ短辺方向に２列のマトリックス状に配置されるものである。 Next, the EBG structure 20 will be described. The EBG structure 20 is composed of six EBG elements 21-26, which are disposed between the pair of antenna elements 11 and 12. The plurality of EBG elements 21 to 26 are designed so that the target frequencies of the pair of antenna elements 11 and 12 are included in the band gap. Further, as shown in the figure, the plurality of EBG elements 21-26 are arranged in a matrix of three rows in the longitudinal direction and two columns in the short side direction of the radiation portions of the pair of antenna elements 11, 12.
図１に示されるように、個々のＥＢＧ素子（単位セル）は、誘電体や金属で形成された正方形パッチ素子２８と短絡ピン２９によって構成されるマッシュルーム型構造を有している。このような個々のＥＢＧ素子を３行×２列のマトリックス状となるように複数周期的に配置することで、ＥＢＧ構造２０が構成されている。 As shown in FIG. 1, each EBG element (unit cell) has a mushroom type structure including a square patch element 28 and a short-circuit pin 29 formed of a dielectric or metal. The EBG structure 20 is configured by arranging a plurality of such EBG elements periodically so as to form a matrix of 3 rows × 2 columns.
ＥＢＧ構造は、左手系と右手系のバンドギャップの範囲内の電磁波に対して、電磁波の抑制効果がある。したがって、アンテナエレメントのターゲット周波数が例えば２ＧＨｚ帯の場合、この帯域がバンドギャップ内に包含されるようにＥＢＧ構造を設計すれば良い。なお、本発明のアンテナ装置においては、ＥＢＧ構造の単位セル当たりの位相進みをπ／２で設計し、２セル配置（２列）とする。このように設計されたＥＢＧ構造は、例えば以下のような寸法である。即ち、各ＥＢＧ素子の正方形パッチ素子の一辺の長さが３０ｍｍ、短絡ピンの高さが４ｍｍ、短絡ピンの直径が２ｍｍ、正方形パッチ素子間のギャップが２ｍｍ、各ＥＢＧ素子の配置周期が３２ｍｍである。 The EBG structure has an electromagnetic wave suppressing effect against electromagnetic waves within the band gap of the left-handed system and the right-handed system. Therefore, when the target frequency of the antenna element is, for example, 2 GHz band, the EBG structure may be designed so that this band is included in the band gap. In the antenna device of the present invention, the phase advance per unit cell of the EBG structure is designed with π / 2, and a two-cell arrangement (two rows) is adopted. The EBG structure designed in this way has the following dimensions, for example. That is, the length of one side of the square patch element of each EBG element is 30 mm, the height of the shorting pin is 4 mm, the diameter of the shorting pin is 2 mm, the gap between the square patch elements is 2 mm, and the arrangement period of each EBG element is 32 mm. is there.
なお、本発明のアンテナ装置において、ＥＢＧ素子については、上述の図示例のようにパッチ素子が正方形であるものには限定されず、ＥＢＧ素子である限り、六角形等、他の形状のものであっても構わない。 In the antenna device of the present invention, the EBG element is not limited to a square patch element as shown in the above-described example, and may be of other shapes such as a hexagon as long as it is an EBG element. It does not matter.
本発明のアンテナ装置では、上述のような構成とすることで、アンテナエレメント間の相互結合を大幅に低減することが可能となる。図２は、本発明のアンテナ装置のインピーダンス特性を表すグラフである。図中、黒色の実線が本発明のアンテナ装置のインピーダンス特性を表しており、他のグレー線については、比較例としてのＥＢＧ構造が５行×２列、２行×２列、１行×２列の場合のインピーダンス特性を表している。なお、測定条件としては、上述の通り、各ＥＢＧ素子の正方形パッチ素子の一辺の長さが３０ｍｍ、短絡ピンの高さが４ｍｍ、短絡ピンの直径が２ｍｍ、正方形パッチ素子間のギャップが２ｍｍ、各ＥＢＧ素子の配置周期が３２ｍｍのものを用いた。図示の通り、リターンロスＳ１１に関しては特性の大幅な違いはないが、相互結合量Ｓ２１については、本発明のものと他の比較例とでは大きく異なる特性が表れている。即ち、他の例では相互結合量の低下のピークが表れないが、本発明のものでは、大幅な低下のピークが表れる帯域が存在することが分かる。これは、ＥＢＧ構造の単位セル当たりの位相進みをπ／２で設計し、２セル配置とすることで位相進みがπとなり、位相反転が起こることで空間を介する電磁波の結合が相殺されたためと考えられる。 In the antenna device of the present invention, the mutual coupling between the antenna elements can be greatly reduced by adopting the configuration as described above. FIG. 2 is a graph showing impedance characteristics of the antenna device of the present invention. In the figure, the black solid line represents the impedance characteristic of the antenna device of the present invention, and for the other gray lines, the EBG structure as a comparative example has 5 rows × 2 columns, 2 rows × 2 columns, 1 row × 2 The impedance characteristic in the case of a column is shown. As described above, as described above, the length of one side of the square patch element of each EBG element is 30 mm, the height of the shorting pin is 4 mm, the diameter of the shorting pin is 2 mm, and the gap between the square patch elements is 2 mm as described above. The thing with the arrangement period of each EBG element of 32 mm was used. As shown in the figure, there is no significant difference in characteristics with respect to the return loss S11. However, with respect to the mutual coupling amount S21, characteristics significantly different between those of the present invention and other comparative examples appear. That is, in other examples, the peak of the decrease in the mutual coupling amount does not appear, but in the present invention, it can be seen that there is a band where the peak of the significant decrease appears. This is because the phase advance per unit cell of the EBG structure is designed with π / 2, and the two cell arrangement makes the phase advance π, and phase inversion cancels out the coupling of electromagnetic waves through the space. Conceivable.
但し、図２の特性では、リターンロスＳ１１と相互結合量Ｓ２１の低下のピークの帯域がずれているため、次に、最適な特性が得られるよう調整したものについて説明する。図３は、本発明のアンテナ装置のパッチ素子の長さとパッチ素子間のギャップを変化させた場合のインピーダンス特性を表すグラフである。測定条件としては、上述の通り、各ＥＢＧ素子の短絡ピンの高さが４ｍｍ、短絡ピンの直径が２ｍｍ、各ＥＢＧ素子の配置周期が３２ｍｍのものを用いた。そして、正方形パッチ素子の一辺の長さＷを３０ｍｍ、２９．５ｍｍ、２９ｍｍ、そのときの各ギャップＧをそれぞれ２ｍｍ、２．５ｍｍ、３ｍｍと変化させたときのインピーダンス特性である。図示の通り、正方形パッチ素子の一辺の長さＷを２９．５ｍｍ、ギャップＧを２．５ｍｍとしたときに、リターンロスＳ１１と相互結合量Ｓ２１の低下のピークの帯域が概ね一致し、２ＧＨｚ帯において相互結合量を低下させることが可能となった。なお、このときの相互結合量は、−４８ｄＢまで低下していた。このように、本発明のアンテナ装置では、パッチ素子の大きさやギャップを調整することにより、所望の特性となるように構成することが可能である。これにより、アンテナエレメント間の相互結合が大幅に低減可能となる。 However, in the characteristics shown in FIG. 2, since the peak bands of the return loss S11 and the decrease in the mutual coupling amount S21 are deviated, a description will now be given of what is adjusted to obtain the optimum characteristics. FIG. 3 is a graph showing impedance characteristics when the length of the patch element and the gap between the patch elements of the antenna device of the present invention are changed. As the measurement conditions, as described above, the short-circuit pin height of each EBG element was 4 mm, the short-circuit pin diameter was 2 mm, and the arrangement period of each EBG element was 32 mm. The impedance characteristics are obtained when the length W of one side of the square patch element is changed to 30 mm, 29.5 mm, and 29 mm, and the respective gaps G are changed to 2 mm, 2.5 mm, and 3 mm, respectively. As shown in the figure, when the length W of one side of the square patch element is 29.5 mm and the gap G is 2.5 mm, the peak bands of the return loss S11 and the decrease in the mutual coupling amount S21 are approximately the same, and the 2 GHz band. It was possible to reduce the amount of mutual coupling in In addition, the mutual coupling | bonding amount at this time was falling to -48 dB. Thus, the antenna device of the present invention can be configured to have desired characteristics by adjusting the size and gap of the patch element. Thereby, the mutual coupling between the antenna elements can be greatly reduced.
次に、図４を用いて、本発明のアンテナ装置の放射特性について説明する。図４は、本発明のアンテナ装置の放射特性を説明するためのグラフであり、図４（ａ）が本発明のアンテナ装置のもの、図４（ｂ）が比較例としてＥＢＧ構造を設けない場合のアンテナ装置のものである。なお、この放射特性は、図１（ａ）のアンテナエレメント１１を給電し、アンテナエレメント１２は５０Ω（特性インピーダンス）で終端した場合の結果である。図示の通り、ｚ−ｘ平面では、ＥＢＧ構造を設けていないものと比べて、本発明のアンテナ装置は給電したアンテナエレメント側に約４５度方向に強い指向性を持った放射特性となることがわかる。 Next, radiation characteristics of the antenna device of the present invention will be described with reference to FIG. FIG. 4 is a graph for explaining the radiation characteristics of the antenna device of the present invention. FIG. 4A shows the antenna device of the present invention, and FIG. 4B shows the case where the EBG structure is not provided as a comparative example. Of the antenna device. This radiation characteristic is a result when the antenna element 11 of FIG. 1A is fed and the antenna element 12 is terminated at 50Ω (characteristic impedance). As shown in the figure, in the zx plane, the antenna device of the present invention has a radiation characteristic having a strong directivity in the direction of about 45 degrees on the side of the fed antenna element as compared with the case where the EBG structure is not provided. Recognize.
また、図５を用いて、本発明のアンテナ装置の有限地板の大きさについて説明する。図５は、本発明のアンテナ装置の、有限地板の１辺の長さに対する相互結合量の変化を表すグラフである。なお、有限地板は正方形とした。図示の通り、有限地板の１辺の長さが１５０ｍｍよりも小さくなると、急激に結合抑制効果が弱くなることが分かる。これは、ＥＢＧ構造の単位セル当たりの位相進みをπ／２で設計し、２セル配置とすることで位相反転が起こり、空間を介する電磁波の結合が相殺されるような構成としていたものが、有限地板を小型化していくと単位セル当たりの位相進みが異なってしまったために起きたものと考えられる。また、地板が大きいときには、地板上に流れる電流がアンテナエレメントの給電部から広く分散していたが、地板が小さくなると、ＥＢＧ構造を迂回して流れる電流密度が高くなってしまったものと考えられる。 Moreover, the magnitude | size of the finite ground plane of the antenna apparatus of this invention is demonstrated using FIG. FIG. 5 is a graph showing a change in the mutual coupling amount with respect to the length of one side of the finite ground plane in the antenna device of the present invention. The finite ground plane was square. As shown in the figure, it can be seen that when the length of one side of the finite ground plane is smaller than 150 mm, the coupling suppression effect is suddenly weakened. This is a configuration in which the phase advance per unit cell of the EBG structure is designed by π / 2, the phase inversion occurs by setting the two cells, and the coupling of electromagnetic waves through the space is canceled. This is probably because the phase advance per unit cell was different when the finite ground plane was made smaller. In addition, when the ground plane is large, the current flowing on the ground plane is widely dispersed from the feeding portion of the antenna element. However, when the ground plane is small, the current density flowing around the EBG structure is considered to have increased. .
次に、本発明のアンテナ装置のアンテナエレメントとＥＢＧ構造との位置関係について説明する。図６は、本発明のアンテナ装置のアンテナエレメントとＥＢＧ素子の位置関係を説明するための概略図である。一対のアンテナエレメントの各給電点を、２行目に配置されるＥＢＧ素子２２，２５の中心点間を結ぶ線の延長線である中心線上から±１Ｔ（但し、ＴはＥＢＧ素子の配置周期）の範囲で、１／４Ｔ間隔で変化させたときのインピーダンス特性を検討した。このときの測定結果が図７及び図８である。なお、アンテナエレメントやＥＢＧ構造の寸法等は上述の例と同様である。図７は＋ｙ軸方向にアンテナエレメントの給電点の配置位置をずらした場合のインピーダンス特性を表すグラフであり、図８は−ｙ軸方向にアンテナエレメントの給電点の配置位置をずらした場合のインピーダンス特性を表すグラフである。 Next, the positional relationship between the antenna element of the antenna device of the present invention and the EBG structure will be described. FIG. 6 is a schematic diagram for explaining the positional relationship between the antenna element and the EBG element of the antenna device of the present invention. ± 1T from the center line, which is an extension of the line connecting the center points of the EBG elements 22 and 25 arranged in the second row, to the feed points of the pair of antenna elements (where T is the EBG element arrangement period) In this range, the impedance characteristics when changing at 1 / 4T intervals were studied. The measurement results at this time are shown in FIGS. The dimensions of the antenna element and the EBG structure are the same as in the above example. FIG. 7 is a graph showing impedance characteristics when the arrangement position of the feeding point of the antenna element is shifted in the + y-axis direction, and FIG. 8 is an impedance when the arrangement position of the feeding point of the antenna element is shifted in the −y-axis direction. It is a graph showing a characteristic.
これらの図から分かるように、２行目に配置されるＥＢＧ素子２２，２５の中心点間を結ぶ線の延長線である中心線上から放射部側にＥＢＧ素子の１／２配置周期分ずらした位置上から、前記中心線上から放射部と反対側にＥＢＧ素子の１／４配置周期分ずらした位置上の範囲内に配置されたときに、相互結合量Ｓ２１の低下のピークが表れることが分かる。即ち、中心線を基準に−１／４Ｔから＋１／２Ｔの間でアンテナエレメント１１，１２の各給電点をＥＢＧ素子に対して配置することが可能であることが分かる。特に、２行目に配置されるＥＢＧ素子２２，２５の中心点間を結ぶ線の延長線である中心線上（０Ｔ）、中心線上から放射部側にＥＢＧ素子の１／２配置周期分ずらした位置上（＋１／２Ｔ）、中心線上から放射部と反対側にＥＢＧ素子の１／４配置周期分ずらした位置上（−１／４Ｔ）の場合に所望の特性が得られることが分かる。 As can be seen from these drawings, the EBG elements 22 and 25 arranged in the second row are shifted from the center line, which is an extension of the line connecting the center points, by ½ arrangement period of the EBG elements to the radiation part side. From the position, it can be seen that a peak of a decrease in the mutual coupling amount S21 appears when the EBG element is arranged within a range shifted by a quarter arrangement period of the EBG element from the center line to the opposite side of the radiating portion. . That is, it can be seen that the feeding points of the antenna elements 11 and 12 can be arranged with respect to the EBG element between -1 / 4T and + 1 / 2T with respect to the center line. In particular, the center line (0T), which is an extension of the line connecting the center points of the EBG elements 22 and 25 arranged in the second row, is shifted from the center line to the radiating part side by the 1/2 arrangement period of the EBG elements. It can be seen that the desired characteristics can be obtained in the case of the position (+ 1 / 2T) and the position shifted by ¼ arrangement period of the EBG element from the center line to the side opposite to the radiating portion (−1 / 4T).
なお、リターンロスＳ１１と相互結合量Ｓ２１の低下のピークの帯域を一致させるためには、上述のように、例えばパッチ素子の大きさやギャップを調整すれば良い。 In order to make the return loss S11 and the peak band of the decrease in the mutual coupling amount S21 coincide with each other, for example, the size and gap of the patch element may be adjusted as described above.
このように、本発明のアンテナ装置によれば、地板表面を伝搬する電磁波を抑制するだけでなく、アンテナエレメント自体の間の相互結合を抑制可能となる。 Thus, according to the antenna device of the present invention, not only the electromagnetic wave propagating on the surface of the ground plane but also the mutual coupling between the antenna elements themselves can be suppressed.
なお、本発明のアンテナエレメント間の相互結合を抑制可能なアンテナ装置は、上述の図示例にのみ限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。また、上述の説明で用いた寸法等については、あくまでも単なる一例であり、ターゲット周波数や用途に応じて種々変更を加え得ることは勿論である。 The antenna device capable of suppressing the mutual coupling between the antenna elements of the present invention is not limited to the above illustrated example, and various modifications can be made without departing from the scope of the present invention. It is. Further, the dimensions and the like used in the above description are merely examples, and it is needless to say that various changes can be made according to the target frequency and application.
１ 有限地板
１１，１２ アンテナエレメント
２０ ＥＢＧ構造
２１−２６ ＥＢＧ素子
２８ 正方形パッチ素子
２９ 短絡ピン
DESCRIPTION OF SYMBOLS 1 Finite ground plane 11,12 Antenna element 20 EBG structure 21-26 EBG element 28 Square patch element 29 Short-circuit pin
Claims (5)
有限地板に平行な放射部を有し、有限地板上に１／２波長分間隔を置いて夫々平行且つ同一方向に配置される一対のアンテナエレメントと、
有限地板上且つ前記一対のアンテナエレメント間に配置される複数のＥＢＧ素子であって、該複数のＥＢＧ素子は、前記一対のアンテナエレメントのターゲット周波数がバンドギャップ内に包含されるように設計され、前記一対のアンテナエレメントの放射部の長手方向に３行且つ短辺方向に２列のマトリックス状に配置される、複数のＥＢＧ素子と、
を具備することを特徴とするアンテナ装置 An antenna device capable of suppressing mutual coupling between two or more antenna elements, the antenna device comprising:
A pair of antenna elements each having a radiation part parallel to the finite ground plane and arranged in parallel and in the same direction with a ½ wavelength interval on the finite ground plane;
A plurality of EBG elements disposed on a finite ground plane and between the pair of antenna elements, wherein the plurality of EBG elements are designed such that a target frequency of the pair of antenna elements is included in a band gap; A plurality of EBG elements arranged in a matrix of 3 rows in the longitudinal direction and 2 columns in the short side direction of the radiation portion of the pair of antenna elements;
An antenna device comprising:
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