JP5112530B2 - Folded monopole antenna - Google Patents
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Description
本発明は折り返しモノポールアンテナに関し、特に、アンテナ素子間相互結合を抑制した折り返しモノポールアンテナに関する。 The present invention relates to a folded monopole antenna, and more particularly to a folded monopole antenna that suppresses mutual coupling between antenna elements.
近年、次世代の高速移動通信に向けて、複数のアンテナを必要とするアダプティブアンテナやＭＩＭＯ（Ｍｕｌｔｉｐｌｅ Ｉｎｐｕｔ Ｍｕｌｔｉｐｌｅ Ｏｕｔｐｕｔ）等の開発が進められている。このような複数のアンテナを必要とするシステムを、例えば携帯端末のような小型の筐体に内蔵するには、各アンテナを接近させて配置する必要が生じる。このとき、同一周波数帯の各アンテナを接近させて配置すると、アンテナ素子間相互結合が強く生じてしまい、アンテナ特性に大きな影響を及ぼしてしまう。このような背景から、アンテナ素子間相互結合を低減する手法が種々考えられている。 In recent years, adaptive antennas that require a plurality of antennas, MIMO (Multiple Input Multiple Output), and the like have been developed for next-generation high-speed mobile communications. In order to incorporate such a system that requires a plurality of antennas into a small casing such as a portable terminal, it is necessary to place the antennas close to each other. At this time, if antennas in the same frequency band are arranged close to each other, mutual coupling between antenna elements is strongly generated, which greatly affects antenna characteristics. From such a background, various methods for reducing mutual coupling between antenna elements have been considered.
例えば、特許文献１には、逆Ｆアンテナとマイクロストリップアンテナを近接して配置し、それぞれ放射電極を９０度で交差するように配置させてアンテナ素子間相互結合を低減する手法が開示されている。また、特許文献２には、アンテナ素子間に誘電体セパレータを設けることでアンテナ素子間相互結合を低減する手法が開示されている。その他、パッチアンテナ素子間にスロットを設けたものや金属壁を設けたもの、電磁バンドギャップを設けたもの等も存在する。 For example, Patent Document 1 discloses a technique for reducing mutual coupling between antenna elements by arranging an inverted F antenna and a microstrip antenna close to each other and arranging radiating electrodes so as to cross each other at 90 degrees. . Patent Document 2 discloses a technique for reducing mutual coupling between antenna elements by providing a dielectric separator between the antenna elements. In addition, there are those provided with slots between patch antenna elements, those provided with metal walls, those provided with electromagnetic band gaps, and the like.
さらに、非特許文献１には、２つの平面逆Ｆアンテナ素子の各給電部又は短絡部の間を吊り線（サスペンデッドライン）により短絡し、アンテナ素子間相互結合を低減する手法が開示されている。 Further, Non-Patent Document 1 discloses a method of reducing the mutual coupling between antenna elements by short-circuiting between the feeding portions or short-circuit portions of two planar inverted F antenna elements with a suspension line (suspended line). .
一方、本願出願人と同一の出願人による特許文献３には、給電部と短絡部がグラウンド板の短辺と平行な直線上に並ぶように配置されたＬ字型折り返しモノポールアンテナ素子が複数配置されたアンテナに対して、放射素子の給電部側にブリッジ部を設けることで、アンテナ素子間相互結合を低減する手法が開示されている。このアンテナは、逆Ｆアンテナ素子等に比べて小型化が可能であり、さらにアンテナ素子間相互結合を調整してアンテナの特性劣化を改善できるとしている。 On the other hand, in Patent Document 3 by the same applicant as the present applicant, there are a plurality of L-shaped folded monopole antenna elements arranged so that the power feeding portion and the short-circuit portion are arranged on a straight line parallel to the short side of the ground plate. There has been disclosed a technique for reducing mutual coupling between antenna elements by providing a bridge part on the power feeding part side of the radiating element with respect to the arranged antenna. This antenna can be reduced in size as compared with an inverted F antenna element and the like, and further, the mutual coupling between antenna elements can be adjusted to improve the deterioration of the antenna characteristics.
しかしながら、従来技術のうち、逆Ｆアンテナ素子を用いたものについては、アンテナ素子間相互結合を十分に抑制できるものではなかった。また、パッチアンテナにスロットや金属壁等を設けたものについては、パッチアンテナの特性上、単一方向への指向性アンテナのみに適用可能なものであった。さらに、このようなものでは、セパレータやスロット、電磁バンドギャップを設けるための空間が必要となり、グラウンド板上に電子回路等を配置するスペースが少なくなってしまっていた。また、アンテナ装置の高さが増すという問題もあった。 However, among the conventional techniques using the inverted F antenna element, the mutual coupling between the antenna elements cannot be sufficiently suppressed. Further, a patch antenna provided with a slot, a metal wall, or the like can be applied only to a directional antenna in a single direction because of the characteristics of the patch antenna. Furthermore, in such a thing, the space for providing a separator, a slot, and an electromagnetic band gap is required, and the space for arranging an electronic circuit or the like on the ground plate has been reduced. There is also a problem that the height of the antenna device increases.
さらに、非特許文献１に開示の吊り線によりアンテナ素子間を短絡したものについても、アンテナ素子の形状は平面逆Ｆアンテナ素子に限定されるものであり、他の形状のアンテナ素子の場合については何ら開示するものでは無かった。 Further, the antenna elements are short-circuited by the suspension lines disclosed in Non-Patent Document 1, and the shape of the antenna elements is limited to the planar inverted F antenna elements. For antenna elements of other shapes, It was not disclosed at all.
また、特許文献３に開示のＬ字型折り返しモノポールアンテナ素子については、アンテナ素子を配置するのに実装面積がある程度大きいため、小型化に限界があった。 In addition, the L-shaped folded monopole antenna element disclosed in Patent Document 3 has a limitation in miniaturization because the mounting area is somewhat large for arranging the antenna element.
本発明は、斯かる実情に鑑み、小型化が可能であり、且つ、一対のアンテナ素子を接近させて配置させた場合のアンテナ素子間相互結合を低減してアンテナ効率を向上可能な折り返しモノポールアンテナを提供しようとするものである。 In view of such circumstances, the present invention is a folded monopole that can be reduced in size and can improve antenna efficiency by reducing mutual coupling between antenna elements when a pair of antenna elements are arranged close to each other. It is intended to provide an antenna.
上述した本発明の目的を達成するために、本発明による折り返しモノポールアンテナは、導体からなるグラウンド板と、グラウンド板上に配置される第１給電部及び第１短絡部と、グラウンド板上に配置される第２給電部及び第２短絡部であって、第２給電部と第２短絡部を通る直線が第１給電部と第１短絡部を通る直線と平行な直線上に配置され、且つ、第１給電部及び第１短絡部と、第２給電部及び第２短絡部とが、平行な直線間の中心線に対して線対称となるように配置される、第２給電部及び第２短絡部と、グラウンド板の上に配置され、第１給電部から延在し第１短絡部でグラウンド板に短絡される第１折り返しモノポールアンテナ素子と、第２給電部から延在し第２短絡部でグラウンド板に短絡される第２折り返しモノポールアンテナ素子であって、第１折り返しモノポールアンテナ素子と第２折り返しモノポールアンテナ素子が、平行な直線間の中心線を通りグラウンド板に垂直な面に面対称となるようにグラウンド板の上に配置される、第２折り返しモノポールアンテナ素子と、第１折り返しモノポールアンテナ素子と第２折り返しモノポールアンテナ素子との間を短絡するブリッジ部であって、第１短絡部又は第２短絡部からブリッジ部が接続される接続点までの電気的な長さとブリッジ部の電気的な長さの合計が略λ・ｎ／４（但し、λは所望の共振周波数の波長、ｎは奇数）となるように構成されるブリッジ部と、を具備するものである。 In order to achieve the above-described object of the present invention, a folded monopole antenna according to the present invention includes a ground plate made of a conductor, a first feeding portion and a first short-circuit portion arranged on the ground plate, and a ground plate. The second power feeding unit and the second short circuit unit to be arranged, the straight line passing through the second power feeding unit and the second short circuit unit is arranged on a straight line parallel to the straight line passing through the first power feeding unit and the first short circuit unit, And the 1st electric power feeding part and the 1st short circuit part, and the 2nd electric power feeding part and the 2nd short circuit part are arranged so that it may become line symmetrical with respect to the center line between parallel straight lines, A second short-circuited portion, a first folded monopole antenna element disposed on the ground plate, extending from the first power feeding portion and short-circuited to the ground plate by the first short-circuiting portion, and extending from the second power feeding portion Second folded monopole that is short-circuited to the ground plate at the second short-circuit section A tenor element, wherein the first folded monopole antenna element and the second folded monopole antenna element pass through the center line between the parallel straight lines and are symmetrical with respect to a plane perpendicular to the ground plane. A second folded monopole antenna element, and a bridge portion that short-circuits between the first folded monopole antenna element and the second folded monopole antenna element, the first short-circuited part or the second short-circuited part from The sum of the electrical length to the connection point to which the bridge portion is connected and the electrical length of the bridge portion is approximately λ · n / 4 (where λ is the wavelength of the desired resonance frequency and n is an odd number). And a bridge unit configured as described above.
ここで、第１折り返しモノポールアンテナ素子は、第１給電部からグラウンド板に対して垂直方向に立ち上がり、第２給電部方向とは反対方向に曲がりグラウンド板の端部の上までグラウンド板に平行に延在し、グラウンド板に対して垂直方向に再度立ち上がり、第１給電部方向に曲がり第１給電部からの総延長が所望の共振周波数の約４分の１波長となるまでグラウンド板に平行に延在し、第１短絡部方向に曲がり第１短絡部の上までグラウンド板に平行に延在し、第２短絡部方向とは反対方向に曲がりグラウンド板の端部の上までグラウンド板に平行に延在し、グラウンド板に対して垂直方向に立ち下がり、第１短絡部方向に曲がり第１短絡部の上までグラウンド板に平行に延在し、グラウンド板に対して垂直方向に再度立ち下がり、第１短絡部に接続され、第２折り返しモノポールアンテナ素子は、第２給電部からグラウンド板に対して垂直方向に立ち上がり、第１給電部方向とは反対方向に曲がりグラウンド板の端部の上までグラウンド板に平行に延在し、グラウンド板に対して垂直方向に再度立ち上がり、第２給電部方向に曲がり第２給電部からの総延長が所望の共振周波数の約４分の１波長となるまでグラウンド板に平行に延在し、第２短絡部方向に曲がり第２短絡部の上までグラウンド板に平行に延在し、第１短絡部方向とは反対方向に曲がりグラウンド板の端部の上までグラウンド板に平行に延在し、グラウンド板に対して垂直方向に立ち下がり、第２短絡部方向に曲がり第２短絡部の上までグラウンド板に平行に延在し、グラウンド板に対して垂直方向に再度立ち下がり、第２短絡部に接続されるものであれば良い。 Here, the first folded monopole antenna element rises in a direction perpendicular to the ground plate from the first feeding portion, bends in a direction opposite to the direction of the second feeding portion, and is parallel to the ground plate up to the end of the ground plate. , Rises again in the direction perpendicular to the ground plate, bends in the direction of the first feed section and is parallel to the ground plane until the total extension from the first feed section is about a quarter wavelength of the desired resonant frequency. Extending in the direction of the first short circuit part, extending in parallel to the ground plate up to the top of the first short circuit part, bending in the direction opposite to the direction of the second short circuit part and up to the end of the ground plate It extends in parallel, falls in a direction perpendicular to the ground plate, bends in the direction of the first short circuit portion, extends in parallel to the ground plate up to the top of the first short circuit portion, and stands up again in the direction perpendicular to the ground plate Down, second The second folded monopole antenna element connected to the short-circuit portion rises in a direction perpendicular to the ground plate from the second feeding portion, bends in the direction opposite to the first feeding portion direction, and reaches the ground plate up to the end of the ground plate. Extends parallel to the plate, rises up again in a direction perpendicular to the ground plate, bends in the direction of the second feed section, and grounds until the total extension from the second feed section is about a quarter wavelength of the desired resonant frequency Extends parallel to the plate, bends in the direction of the second short circuit portion, extends parallel to the ground plate to the top of the second short circuit portion, bends in the direction opposite to the first short circuit portion direction, and reaches the end of the ground plate Extends parallel to the ground plate, falls in a direction perpendicular to the ground plate, bends in the direction of the second short circuit portion, extends parallel to the ground plate up to the second short circuit portion, and perpendicular to the ground plate Standing again Down, as long as it is connected to the second short-circuit portion.
また、本発明による他の折り返しモノポールアンテナは、グラウンド板と、グラウンド板上に配置される第１給電部及び第１短絡部と、グラウンド板上に配置される第２給電部及び第２短絡部であって、第２給電部と第２短絡部を通る直線が第１給電部と第１短絡部を通る直線と垂直な直線上に配置され、且つ、第１給電部及び第１短絡部と、第２給電部及び第２短絡部とが、垂直な直線間を二分する中心線に対して線対称となるように配置される、第２給電部及び第２短絡部と、グラウンド板の上に配置され、第１給電部から延在し第１短絡部でグラウンド板に短絡される第１折り返しモノポールアンテナ素子と、第２給電部から延在し第２短絡部でグラウンド板に短絡される第２折り返しモノポールアンテナ素子であって、第１折り返しモノポールアンテナ素子と第２折り返しモノポールアンテナ素子が、垂直な直線間を二分する中心線を通りグラウンド板に垂直な面に面対称となるようにグラウンド板の上に配置される、第２折り返しモノポールアンテナ素子と、第１折り返しモノポールアンテナ素子と第２折り返しモノポールアンテナ素子との間を短絡するブリッジ部であって、第１短絡部又は第２短絡部からブリッジ部が接続される接続点までの電気的な長さとブリッジ部の電気的な長さの合計が略λ・ｎ／４（但し、λは所望の共振周波数の波長、ｎは奇数）となるように構成されるブリッジ部と、を具備するものである。 In addition, another folded monopole antenna according to the present invention includes a ground plate, a first feeding portion and a first short-circuit portion disposed on the ground plate, and a second feeding portion and a second short-circuit disposed on the ground plate. A straight line passing through the second power feeding part and the second short circuit part is arranged on a straight line perpendicular to a straight line passing through the first power feeding part and the first short circuit part, and the first power feeding part and the first short circuit part And the second feeding part and the second short-circuit part are arranged so as to be line-symmetric with respect to the center line that bisects the vertical straight line, and the second feeding part and the second short-circuit part, and the ground plate A first folded monopole antenna element disposed above and shorted to the ground plate at the first short-circuit portion and short-circuited to the ground plate at the first short-circuit portion and short-circuited to the ground plate at the second short-circuit portion Second folded monopole antenna element, the first folded The second folded back element is arranged on the ground plate so that the nopole antenna element and the second folded monopole antenna element are symmetrical with respect to a plane perpendicular to the ground plate through a center line that bisects the vertical straight line. A bridge portion for short-circuiting the monopole antenna element and the first folded monopole antenna element and the second folded monopole antenna element, wherein the bridge portion is connected from the first short-circuit portion or the second short-circuit portion The bridge portion configured such that the sum of the electrical length to the point and the electrical length of the bridge portion is approximately λ · n / 4 (where λ is the wavelength of the desired resonance frequency and n is an odd number). And.
ここで、第１折り返しモノポールアンテナ素子は、第１給電部からグラウンド板に対して垂直方向に立ち上がり、第１給電部と第１短絡部を通る直線と垂直な直線方向且つ第２給電部方向とは反対方向に曲がりグラウンド板の端部の上までグラウンド板に平行に延在し、グラウンド板に対して垂直方向に再度立ち上がり、第１給電部方向に曲がり第１給電部からの総延長が所望の共振周波数の約４分の１波長となるまでグラウンド板に平行に延在し、第１短絡部方向に曲がり第１短絡部の上までグラウンド板に平行に延在し、第１給電部と第１短絡部を通る直線と垂直な直線方向且つ第２給電部方向とは反対方向に曲がりグラウンド板の端部の上までグラウンド板に平行に延在し、グラウンド板に対して垂直方向に立ち下がり、第１短絡部方向に曲がり第１短絡部の上までグラウンド板に平行に延在し、グラウンド板に対して垂直方向に再度立ち下がり、第１短絡部に接続され、第２折り返しモノポールアンテナ素子は、第２給電部からグラウンド板に対して垂直方向に立ち上がり、第２給電部と第２短絡部を通る直線と垂直な直線方向且つ第１給電部方向とは反対方向に曲がりグラウンド板の端部の上までグラウンド板に平行に延在し、グラウンド板に対して垂直方向に再度立ち上がり、第２給電部方向に曲がり第２給電部からの総延長が所望の共振周波数の約４分の１波長となるまでグラウンド板に平行に延在し、第２短絡部方向に曲がり第２短絡部の上までグラウンド板に平行に延在し、第２給電部と第２短絡部を通る直線と垂直な直線方向且つ第１給電部方向とは反対方向に曲がりグラウンド板の端部の上までグラウンド板に平行に延在し、グラウンド板に対して垂直方向に立ち下がり、第２短絡部方向に曲がり第２短絡部の上までグラウンド板に平行に延在し、グラウンド板に対して垂直方向に再度立ち下がり、第２短絡部に接続されるものであれば良い。 Here, the first folded monopole antenna element rises in the vertical direction from the first power feeding unit with respect to the ground plate, and is in a linear direction perpendicular to a straight line passing through the first power feeding unit and the first short-circuiting unit and in the second power feeding unit direction. Bends in the opposite direction, extends parallel to the ground plate up to the end of the ground plate, rises up again in the direction perpendicular to the ground plate, bends in the direction of the first power feed section, and the total extension from the first power feed section is The first power supply unit extends in parallel to the ground plate until the wavelength is about a quarter of the desired resonance frequency, bends in the direction of the first short circuit portion, extends in parallel to the ground plate up to the first short circuit portion, and And bends in a direction perpendicular to the straight line passing through the first short-circuit portion and in a direction opposite to the direction of the second power feeding portion, extends parallel to the ground plate up to the end of the ground plate, and is perpendicular to the ground plate. Falling, first short circuit To the top of the first short circuit portion, extending parallel to the ground plate, falling down in the direction perpendicular to the ground plate, connected to the first short circuit portion, and the second folded monopole antenna element Rises vertically from the ground to the ground plate, bends in a linear direction perpendicular to the straight line passing through the second feeding portion and the second short-circuiting portion, and in a direction opposite to the direction of the first feeding portion, and reaches the top of the end of the ground plate Extends parallel to the plate, rises up again in a direction perpendicular to the ground plate, bends in the direction of the second feed section, and grounds until the total extension from the second feed section is about a quarter wavelength of the desired resonant frequency Extending in parallel to the plate, bending in the direction of the second short-circuit portion, extending in parallel to the ground plate up to the second short-circuit portion, perpendicular to the straight line passing through the second power feeding portion and the second short-circuit portion, and the second 1 Direction opposite to the direction of the power feeding unit Extends in parallel to the ground plate up to the end of the bent ground plate, falls in a direction perpendicular to the ground plate, curves in the direction of the second short circuit portion, and extends in parallel to the ground plate up to the second short circuit portion And what is necessary is just to fall in the orthogonal | vertical direction again with respect to a ground board, and to be connected to a 2nd short circuit part.
また、第１短絡部から第１折り返しモノポールアンテナ素子の接続点を通ってブリッジ部を介して、第２折り返しモノポールアンテナ素子の接続点を通って第２折り返しモノポールアンテナ素子から第２短絡部までの電気的な長さが、第１折り返しモノポールアンテナ素子の第１給電部又は第２折り返しモノポールアンテナ素子の第２給電部から折り返すまでの往路又は折り返した後の帰路の電気的な長さに略等しいものであれば良い。 Further, the second short circuit from the second folded monopole antenna element through the connection point of the second folded monopole antenna element through the connection point of the first folded monopole antenna element from the first short circuit part. The electrical length up to the part is the electrical path of the return path after returning from the first feeding part of the first folded monopole antenna element or the second feeding part of the second folded monopole antenna element. It is sufficient if it is approximately equal to the length.
本発明の折り返しモノポールアンテナには、小型化が可能であり、且つ、一対のアンテナ素子を接近させて配置させた場合のアンテナ素子間相互結合を低減してアンテナ効率を向上可能であるという利点がある。 The folded monopole antenna of the present invention can be miniaturized and can reduce the mutual coupling between antenna elements when a pair of antenna elements are placed close to each other, thereby improving the antenna efficiency. There is.
以下、本発明を実施するための形態を図示例と共に説明する。図１は、本発明の第１実施例の折り返しモノポールアンテナの構成を説明するための概略斜視図である。また、図２は、図１に示される折り返しモノポールアンテナの一部を拡大した概略斜視図である。図中、図１と同一の符号を付した部分は同一物を表わしている。なお、図２は図１に示される方向とは反対方向から見た場合の斜視図である。図示の通り、本発明の折り返しモノポールアンテナは、グラウンド板１と、第１折り返しモノポールアンテナ素子２と、第２折り返しモノポールアンテナ素子３と、ブリッジ部４とから主に構成されるものである。なお、各図に示されるＸＹＺ軸座標は、説明の都合上付したものである。 DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described together with illustrated examples. FIG. 1 is a schematic perspective view for explaining the configuration of a folded monopole antenna according to a first embodiment of the present invention. FIG. 2 is an enlarged schematic perspective view of a part of the folded monopole antenna shown in FIG. In the figure, the same reference numerals as those in FIG. 1 denote the same parts. 2 is a perspective view when seen from the direction opposite to the direction shown in FIG. As shown, the folded monopole antenna of the present invention is mainly composed of a ground plate 1, a first folded monopole antenna element 2, a second folded monopole antenna element 3, and a bridge portion 4. is there. Note that the XYZ axis coordinates shown in each figure are attached for convenience of explanation.
グラウンド板１は、導体からなるものであり、例えば携帯端末の基板に相当するものである。なお、図示例ではグラウンド板１の大きさは例えば携帯端末を想定した大きさのものを示したが、本発明はこれに限定されず、アンテナと共振させるためにある程度の大きさを有していれば良い。また、グラウンド板１は、回路基板上にグラウンドパターンとして設けられるものであっても良い。 The ground plate 1 is made of a conductor, and corresponds to, for example, a substrate of a mobile terminal. In the illustrated example, the size of the ground plate 1 is assumed to be, for example, that of a portable terminal. However, the present invention is not limited to this, and has a certain size to resonate with the antenna. Just do it. The ground plate 1 may be provided as a ground pattern on the circuit board.
そして、第１折り返しモノポールアンテナ素子２及び第２折り返しモノポールアンテナ素子３が、グラウンド板１上に配置されている。折り返しモノポールアンテナ素子２，３は、例えば複数バンドやＭＩＭＯ（Ｍｕｌｔｉｐｌｅ Ｉｎｐｕｔ Ｍｕｌｔｉｐｌｅ Ｏｕｔｐｕｔ）等の複数チャンネルを実現するために複数設けられるものである。各折り返しモノポールアンテナ素子は、それぞれ給電部と短絡部に接続されている。 A first folded monopole antenna element 2 and a second folded monopole antenna element 3 are disposed on the ground plate 1. A plurality of folded monopole antenna elements 2 and 3 are provided in order to realize a plurality of channels such as a plurality of bands and MIMO (Multiple Input Multiple Output). Each folded monopole antenna element is connected to a power feeding portion and a short-circuit portion, respectively.
ここで、給電部と短絡部についてより詳細に説明する。第１折り返しモノポールアンテナ素子２用の第１給電部２１及び第１短絡部２２が、グラウンド板１上に配置されている。同様に、第２折り返しモノポールアンテナ素子３用の第２給電部３１及び第１短絡部３２も、グラウンド板１上に配置されている。図示の通り、第２給電部３１と第２短絡部３２は、これらを通る直線が、第１給電部２１と第１短絡部２２を通る直線と平行な直線上に配置されている（Ｙ軸方向に平行な直線上に配置されている）。また、第１給電部２１及び第１短絡部２２と、第２給電部３１及び第２短絡部３２とは、平行な直線間の中心線Ｃに対して線対称となるように配置されている。即ち、グラウンド板１の中心線Ｃを中心に左右対称に各給電部及び各短絡部が配置されている。 Here, the power feeding unit and the short-circuit unit will be described in more detail. A first feeding portion 21 and a first short-circuit portion 22 for the first folded monopole antenna element 2 are disposed on the ground plate 1. Similarly, the second feeding portion 31 and the first short-circuit portion 32 for the second folded monopole antenna element 3 are also arranged on the ground plate 1. As shown in the figure, the second power feeding unit 31 and the second short-circuiting unit 32 are arranged on a straight line passing through the first power feeding unit 21 and the first short-circuiting unit 22 (Y axis). Arranged on a straight line parallel to the direction). Moreover, the 1st electric power feeding part 21 and the 1st short circuit part 22, and the 2nd electric power feeding part 31 and the 2nd short circuit part 32 are arrange | positioned so that it may become line symmetrical with respect to the centerline C between parallel straight lines. . In other words, the power feeding portions and the short-circuit portions are arranged symmetrically about the center line C of the ground plate 1.
第１折り返しモノポールアンテナ素子２は、上述のように配置された第１給電部２１から延在し、第１短絡部２２でグラウンド板１に短絡されている。同様に、第２折り返しモノポールアンテナ素子３も、上述のように配置された第２給電部３１から延在し、第２短絡部３２でグラウンド板１に短絡されている。また、第１折り返しモノポールアンテナ素子２と第２折り返しモノポールアンテナ素子３は、中心線Ｃを通りグラウンド板１に垂直な面に面対称となるようにグラウンド板１の上に配置されている。 The first folded monopole antenna element 2 extends from the first power feeding portion 21 arranged as described above, and is short-circuited to the ground plate 1 by the first short-circuit portion 22. Similarly, the second folded monopole antenna element 3 also extends from the second power feeding portion 31 arranged as described above, and is short-circuited to the ground plate 1 by the second short-circuit portion 32. The first folded monopole antenna element 2 and the second folded monopole antenna element 3 are arranged on the ground plate 1 so as to be plane-symmetric with respect to a plane passing through the center line C and perpendicular to the ground plate 1. .
以下、より詳細の折り返しモノポールアンテナ素子の構成について説明する。図２を参照すると、第１折り返しモノポールアンテナ素子２は、まず、第１給電部２１からグラウンド板に対して垂直方向（Ｚ軸方向）に立ち上がる。そして、第２給電部３１方向とは反対方向（−Ｘ軸方向）に曲がりグラウンド板１の端部の上までグラウンド板１に平行に延在する。次に、グラウンド板１に対して垂直方向（Ｚ軸方向）に再度立ち上がり、第１給電部２１方向（Ｘ軸方向）に曲がり第１給電部２１からの総延長が所望の共振周波数の約４分の１波長となるまでグラウンド板１に平行に延在する。そして、第１短絡部２２方向（Ｙ軸方向）に曲がり第１短絡部２２と第２短絡部３２を通る直線の上までグラウンド板１に平行に延在する。その後、第２短絡部３２方向とは反対方向（−Ｘ軸方向）に曲がりグラウンド板１の端部の上までグラウンド板１に平行に延在する。そして、グラウンド板１に対して垂直方向（−Ｚ軸方向）に立ち下がり、第１短絡部２２方向（Ｘ軸方向）に曲がり第１短絡部２２の上までグラウンド板１に平行に延在する。最後に、グラウンド板１に対して垂直方向（−Ｚ軸方向）に再度立ち下がり、第１短絡部２２に接続されることで、第１折り返しモノポールアンテナ素子２が構成されている。 Hereinafter, a more detailed configuration of the folded monopole antenna element will be described. Referring to FIG. 2, the first folded monopole antenna element 2 first rises in the vertical direction (Z-axis direction) with respect to the ground plate from the first feeding portion 21. And it bends in the direction opposite to the direction of the second power feeding section 31 (−X axis direction) and extends in parallel to the ground plate 1 to the top of the end portion of the ground plate 1. Next, it rises again in the direction perpendicular to the ground plate 1 (Z-axis direction), bends in the direction of the first power feeding part 21 (X-axis direction), and the total extension from the first power feeding part 21 is about 4 of the desired resonance frequency. It extends parallel to the ground plate 1 until it has a wavelength of 1 / min. And it bends in the direction of the 1st short circuit part 22 (Y-axis direction), and extends in parallel with the ground board 1 to the top of the straight line passing through the 1st short circuit part 22 and the 2nd short circuit part 32. Then, it bends in a direction opposite to the direction of the second short circuit portion 32 (−X-axis direction) and extends in parallel to the ground plate 1 up to the end of the ground plate 1. Then, it falls in the direction perpendicular to the ground plate 1 (−Z-axis direction), bends in the first short-circuit portion 22 direction (X-axis direction), and extends in parallel to the ground plate 1 to the top of the first short-circuit portion 22. . Finally, the first folded monopole antenna element 2 is configured by falling again in the vertical direction (−Z-axis direction) with respect to the ground plate 1 and being connected to the first short-circuit portion 22.
同様に、第２折り返しモノポールアンテナ素子３は、まず、第２給電部３１からグラウンド板１に対して垂直方向（Ｚ軸方向）に立ち上がる。そして、第１給電部方向２１とは反対方向（Ｘ軸方向）に曲がりグラウンド板１の端部の上までグラウンド板１に平行に延在する。次に、グラウンド板１に対して垂直方向（Ｚ軸方向）に再度立ち上がり、第２給電部３１方向（−Ｘ軸方向）に曲がり第２給電部３１からの総延長が所望の共振周波数の約４分の１波長となるまでグラウンド板１に平行に延在する。そして、第２短絡部３２方向（Ｙ軸方向）に曲がり第１短絡部２２と第２短絡部３２を通る直線の上までグラウンド板１に平行に延在する。その後、第１短絡部２２方向とは反対方向（Ｘ軸方向）に曲がりグラウンド板１の端部の上までグラウンド板１に平行に延在する。そして、グラウンド板１に対して垂直方向（−Ｚ軸方向）に立ち下がり、第２短絡部３２方向（−Ｘ軸方向）に曲がり第２短絡部３２の上までグラウンド板１に平行に延在する。最後に、グラウンド板１に対して垂直方向（−Ｚ軸方向）に再度立ち下がり、第２短絡部３２に接続されることで、第２折り返しモノポールアンテナ素子３が構成されている。 Similarly, the second folded monopole antenna element 3 first rises in the vertical direction (Z-axis direction) with respect to the ground plate 1 from the second feeding portion 31. And it bends in the direction (X-axis direction) opposite to the 1st electric power feeding part direction 21, and is extended in parallel with the ground board 1 to on the edge part of the ground board 1. FIG. Next, it rises again in the direction perpendicular to the ground plate 1 (Z-axis direction), bends in the direction of the second power feeding part 31 (−X-axis direction), and the total extension from the second power feeding part 31 is about the desired resonance frequency. It extends parallel to the ground plate 1 until it has a quarter wavelength. And it bends in the 2nd short circuit part 32 direction (Y-axis direction), and is extended in parallel with the ground board 1 to the top of the straight line which passes along the 1st short circuit part 22 and the 2nd short circuit part 32. Then, it bends in a direction opposite to the first short-circuit portion 22 direction (X-axis direction) and extends in parallel to the ground plate 1 to above the end portion of the ground plate 1. Then, it falls in the direction perpendicular to the ground plate 1 (−Z-axis direction), bends in the direction of the second short-circuit portion 32 (−X-axis direction), and extends in parallel to the ground plate 1 up to the second short-circuit portion 32. To do. Finally, the second folded monopole antenna element 3 is configured by falling again in the vertical direction (−Z-axis direction) with respect to the ground plate 1 and being connected to the second short-circuit portion 32.
これらの第１折り返しモノポールアンテナ素子２と第２折り返しモノポールアンテナ素子３は、正面（Ｙ軸方向）から見るとＣ字形を対向配置させて対称にしたような形状となっている。また、各アンテナ素子の給電部及び短絡部は、それぞれ近接して配置されると共に、アンテナ素子の給電部から経路が最も遠い部分、即ち、各アンテナ素子の往路と帰路の間の折り返す部分が、所定の間隔が設けられて配置されている。また、第１折り返しモノポールアンテナ素子２と第２折り返しモノポールアンテナ素子３は、それぞれ共振周波数に応じてアンテナ素子全長が決定されている。即ち、例えばアンテナ素子全長は、共振周波数の約２分の１波長分の電気的な長さに決定されれば良い。 The first folded monopole antenna element 2 and the second folded monopole antenna element 3 are shaped so as to be symmetrical with the C-shapes facing each other when viewed from the front (Y-axis direction). In addition, the feeding portion and the short-circuit portion of each antenna element are arranged close to each other, and the portion where the path is farthest from the feeding portion of the antenna element, that is, the portion that is turned back between the forward path and the return path of each antenna element, They are arranged with a predetermined interval. Further, the total length of the first folded monopole antenna element 2 and the second folded monopole antenna element 3 is determined in accordance with the resonance frequency. That is, for example, the total length of the antenna element may be determined as an electrical length corresponding to about one-half wavelength of the resonance frequency.
なお、各折り返しモノポールアンテナ素子は、一連の配線からなっていれば良いため、１本の導線を折り曲げて形成しても良いし、例えば多層基板等により、スルーホール等を用いて折り返すように配線をパターンニング形成しても良い。なお、配線幅については、例えば１ｍｍ程度であれば良い。 Each folded monopole antenna element only needs to be formed of a series of wirings, and may be formed by bending a single conductive wire. For example, the folded monopole antenna element may be folded using a through-hole or the like with a multilayer substrate or the like. The wiring may be formed by patterning. The wiring width may be about 1 mm, for example.
そして、本発明の最も特徴的な部分であるブリッジ部４は、第１折り返しモノポールアンテナ素子２と第２折り返しモノポールアンテナ素子３との間を短絡するものである。ここで、本発明で用いられる上述のような形状の一対の折り返しモノポールアンテナ素子に対しては、ブリッジ部４は、第１短絡部２２からブリッジ部４が接続される接続点Ｃ１までの電気的な長さと、ブリッジ部４の電気的な長さｄの合計が略λ／４（但し、λは所望の共振周波数の波長）となるように構成される。また、第２短絡部３２からブリッジ部４が接続される接続点Ｃ２までの電気的な長さと、ブリッジ部４の電気的な長さｄの合計が略λ／４であっても良い。具体的には、図示例では、接続点Ｃ１，Ｃ２はそれぞれ第１短絡部２２及び第２短絡部３２に近い側に配置されており、第１短絡部２２から接続点Ｃ１までの電気的な長さ、又は第２短絡部３２から接続点Ｃ２までの電気的な長さと、ブリッジ部４の電気的な長さの合計が略λ／４となるように構成されている。また、図示例では、接続点Ｃ１，Ｃ２は、中心線Ｃに対して線対称となるように配置されている。また、図示例では、ブリッジ部はグラウンド板に対して水平方向に接続される例を示したが、本発明はこれに限定されず、垂直方向に接続されても良い。 The bridge portion 4, which is the most characteristic part of the present invention, shorts between the first folded monopole antenna element 2 and the second folded monopole antenna element 3. Here, for the pair of folded monopole antenna elements having the above-described shape used in the present invention, the bridge portion 4 has an electrical connection from the first short-circuit portion 22 to the connection point C1 to which the bridge portion 4 is connected. The total length and the electrical length d of the bridge portion 4 are configured to be approximately λ / 4 (where λ is a wavelength of a desired resonance frequency). Further, the total of the electrical length from the second short-circuit portion 32 to the connection point C2 to which the bridge portion 4 is connected and the electrical length d of the bridge portion 4 may be approximately λ / 4. Specifically, in the illustrated example, the connection points C1 and C2 are arranged on the sides close to the first short-circuit portion 22 and the second short-circuit portion 32, respectively, and the electrical connection from the first short-circuit portion 22 to the connection point C1. The sum of the length or the electrical length from the second short-circuit portion 32 to the connection point C2 and the electrical length of the bridge portion 4 is set to approximately λ / 4. In the illustrated example, the connection points C <b> 1 and C <b> 2 are arranged so as to be symmetric with respect to the center line C. In the illustrated example, the bridge portion is connected in the horizontal direction with respect to the ground plate, but the present invention is not limited to this and may be connected in the vertical direction.
このように、上述のような形状の一対の折り返しモノポールアンテナ素子に対して、ブリッジ部４により第１折り返しモノポールアンテナ素子２と第２折り返しモノポールアンテナ素子３との間を、所定の条件に基づき構成されたブリッジ部により短絡することで、アンテナ素子間相互結合を大幅に低減でき、アンテナ効率を向上させることが可能となる。なお、アンテナ素子間相互結合の量は、ブリッジ部４の電気的な長さｄにより概ね調整可能である。 Thus, with respect to the pair of folded monopole antenna elements having the above-described shape, a predetermined condition is established between the first folded monopole antenna element 2 and the second folded monopole antenna element 3 by the bridge portion 4. By short-circuiting with the bridge portion configured based on the above, mutual coupling between antenna elements can be greatly reduced, and antenna efficiency can be improved. Note that the amount of mutual coupling between antenna elements can be generally adjusted by the electrical length d of the bridge portion 4.
ここで、ブリッジ部４の電気的な長さｄを決定する接続点Ｃ１，Ｃ２の位置についてより詳細に説明する。図２の例では、アンテナ素子間相互結合の量を最も低減するためには、第１短絡部２２から第１折り返しモノポールアンテナ素子２の接続点Ｃ１を通ってブリッジ部４を介して、第２折り返しモノポールアンテナ素子３の接続点Ｃ２までの電気的な長さが、第１折り返しモノポールアンテナ素子２の第１給電部２１から折り返すまでの往路の電気的な長さに略等しいことが好ましい。また、第１折り返しモノポールアンテナ素子２の折り返すまでの往路の電気的な長さではなく、折り返した後の帰路の電気的な長さに略等しく構成されても良い。さらに、第２折り返しモノポールアンテナ素子３の第２給電部３１から折り返すまでの往路又は折り返した後の帰路の電気的な長さを基準にしても良い。即ち、ブリッジ部４の電気的な長さｄと、ブリッジ部４の各接続点Ｃ１，Ｃ２から各短絡部２２，３２までの電気的な長さの合計が、折り返しモノポールアンテナ素子の全長の約半分の電気的な長さに略等しくなるように、各接続点Ｃ１，Ｃ２の位置が決定されることが好ましい。したがって、例えば折り返しモノポールアンテナ素子の全長が共振周波数の約２分の１波長分（λ／２）の電気的な長さであれば、往路又は帰路の電気的な長さは約４分の１波長分（λ／４）の電気的な長さになるため、ブリッジ部４の電気的な長さｄと、ブリッジ部４の各接続点Ｃ１，Ｃ２から各短絡部２２，３２までの電気的な長さの合計も、約４分の１波長分（λ／４）の電気的な長さとなるように各寸法が決定されれば良い。 Here, the positions of the connection points C1 and C2 that determine the electrical length d of the bridge portion 4 will be described in more detail. In the example of FIG. 2, in order to reduce the amount of mutual coupling between the antenna elements most, the first short-circuit portion 22 passes through the connection point C1 of the first folded monopole antenna element 2 and passes through the bridge portion 4. The electrical length from the first folded monopole antenna element 2 to the connection point C2 is substantially equal to the electrical length of the forward path from the first feeding portion 21 of the first folded monopole antenna element 2 to the connection point C2. preferable. Further, it may be configured to be approximately equal to the electrical length of the return path after the return, rather than the electrical length of the return path until the first return monopole antenna element 2 is returned. Furthermore, the electrical length of the return path after returning from the second feeding portion 31 of the second folded monopole antenna element 3 or returning may be used as a reference. That is, the sum of the electrical length d of the bridge portion 4 and the electrical lengths from the connection points C1 and C2 of the bridge portion 4 to the short-circuit portions 22 and 32 is the total length of the folded monopole antenna element. The positions of the connection points C1 and C2 are preferably determined so as to be approximately equal to about half of the electrical length. Therefore, for example, if the total length of the folded monopole antenna element is an electrical length corresponding to about a half wavelength (λ / 2) of the resonance frequency, the electrical length of the outward path or the return path is about 4 minutes. Since the electrical length is equal to one wavelength (λ / 4), the electrical length d of the bridge portion 4 and the electricity from the connection points C1 and C2 of the bridge portion 4 to the short-circuit portions 22 and 32 are as follows. Each dimension may be determined so that the total length of the electrical length is an electrical length corresponding to about a quarter wavelength (λ / 4).
このように構成された本発明の折り返しモノポールアンテナは、例えば上述の特許文献３に記載のアンテナ素子に比べて、体積比で約５０％以上も小型化が可能である。また、本発明の折り返しモノポールアンテナは、一対のアンテナ素子を接近させて配置した場合であっても、アンテナ素子間相互結合を低減することができ、アンテナ効率を向上させることができる。 The folded monopole antenna of the present invention configured as described above can be reduced in size by about 50% or more in volume ratio as compared with the antenna element described in Patent Document 3 described above, for example. In addition, the folded monopole antenna of the present invention can reduce mutual coupling between antenna elements even when a pair of antenna elements are arranged close to each other, and can improve antenna efficiency.
以下、本発明の第１実施例の折り返しモノポールアンテナの共振周波数を２ＧＨｚとして設計した場合の特性について、図３及び図４を用いて説明する。図３は、本発明の折り返しモノポールアンテナのリターンロスとアンテナ素子間相互結合量の周波数特性を示すグラフである。また、図４は、本発明の折り返しモノポールアンテナのアンテナ効率の周波数特性を示すグラフである。図中、「Ｗ／ｏ Ｂｒｉｄｇｅ」がブリッジ部を設けない場合の特性であり、「Ｗｉｔｈ Ｂｒｉｄｇｅ」が本発明のようにブリッジ部を設けた場合の特性である。また、図３において、Ｓ１１がリターンロスの特性であり、Ｓ２１がアンテナ素子間相互結合量の特性である。図３から分かるように、アンテナ素子間相互結合量（Ｓ２１）は、ブリッジ部の有無により、共振周波数の２ＧＨｚ付近で約１７ｄＢ程度も低減できていることが分かる。さらに、広帯域にわたってアンテナ素子間相互結合が抑制されていることも分かる。また、図４から分かるように、アンテナ効率についても、ブリッジ部の有無により、共振周波数の２ＧＨｚ付近で約１２％程度も向上していることが分かる。なお、リターンロス（Ｓ１１）については、−１０ｄＢ以下であれば問題ないレベルであり、本発明の場合についても十分な特性となっている。 Hereinafter, characteristics when the resonant frequency of the folded monopole antenna according to the first embodiment of the present invention is designed to be 2 GHz will be described with reference to FIGS. FIG. 3 is a graph showing the frequency characteristics of the return loss and the amount of mutual coupling between antenna elements of the folded monopole antenna of the present invention. FIG. 4 is a graph showing frequency characteristics of antenna efficiency of the folded monopole antenna of the present invention. In the figure, “W / o Bridge” is a characteristic when the bridge portion is not provided, and “With Bridge” is a characteristic when the bridge portion is provided as in the present invention. In FIG. 3, S 11 is a return loss characteristic, and S 21 is a characteristic of the mutual coupling amount between antenna elements. As can be seen from FIG. 3, the amount of mutual coupling (S 21 ) between the antenna elements can be reduced by about 17 dB near the resonance frequency of 2 GHz depending on the presence or absence of the bridge portion. It can also be seen that the mutual coupling between the antenna elements is suppressed over a wide band. Further, as can be seen from FIG. 4, the antenna efficiency is also improved by about 12% around the resonance frequency of 2 GHz depending on the presence or absence of the bridge portion. Note that the return loss (S 11 ) is at a level where there is no problem as long as it is −10 dB or less, and the characteristics of the present invention are sufficient.
また、本発明の第１実施例の折り返しモノポールアンテナの放射パターンについて、図５を用いて説明する。図５は、本発明の折り返しモノポールアンテナの放射パターンを示すグラフである。図中、「Ｗ／ｏ Ｂｒｉｄｇｅ」がブリッジ部を設けない場合の特性であり、「Ｗｉｔｈ Ｂｒｉｄｇｅ」が本発明のようにブリッジ部を設けた場合の特性である。図５から分かるように、ブリッジ部の有無によって放射パターンに大きな変化はないが、本発明のようにブリッジ部を設けることにより、利得が向上していることが分かる。 The radiation pattern of the folded monopole antenna according to the first embodiment of the present invention will be described with reference to FIG. FIG. 5 is a graph showing a radiation pattern of the folded monopole antenna of the present invention. In the figure, “W / o Bridge” is a characteristic when the bridge portion is not provided, and “With Bridge” is a characteristic when the bridge portion is provided as in the present invention. As can be seen from FIG. 5, the radiation pattern does not change greatly depending on the presence or absence of the bridge portion, but it can be seen that the gain is improved by providing the bridge portion as in the present invention.
次に、本発明の第２実施例の折り返しモノポールアンテナについて説明する。図６は、本発明の第２実施例の折り返しモノポールアンテナの構成を説明するための概略斜視図である。図中、図１と同一の符号を付した部分は概ね同一物を表わしており、アンテナ素子全長等、基本的には第１実施例のものと同様である。本発明の第１実施例の折り返しモノポールアンテナでは、一対の折り返しモノポールアンテナ素子を横並びに配置したものであったが、第２実施例の折り返しモノポールアンテナは、一対の折り返しモノポールアンテナ素子がＬ字型になるようにグラウンド板の角に配置されるものである。 Next, a folded monopole antenna according to a second embodiment of the present invention will be described. FIG. 6 is a schematic perspective view for explaining the configuration of the folded monopole antenna according to the second embodiment of the present invention. In the figure, the parts denoted by the same reference numerals as those in FIG. 1 generally represent the same elements, and are basically the same as those in the first embodiment, such as the total length of the antenna element. In the folded monopole antenna of the first embodiment of the present invention, a pair of folded monopole antenna elements are arranged side by side. However, the folded monopole antenna of the second embodiment is a pair of folded monopole antenna elements. Is arranged at the corner of the ground plate so as to be L-shaped.
即ち、第１実施例では第２給電部と第２短絡部を通る直線が第１給電部と第１短絡部を通る直線と平行な関係を有していたが、第２実施例では、図示の通り、第２給電部３１ａと第２短絡部３２ａを通る直線が第１給電部２１ａと第１短絡部２２ａを通る直線と垂直な関係を有している。また、第１給電部２１ａ及び第１短絡部２２ａと、第２給電部３１ａ及び第２短絡部３２ａとが、垂直な直線間を二分する中心線Ｃ'に対して線対称となるように配置されている。 That is, in the first embodiment, the straight line passing through the second power feeding portion and the second short-circuit portion has a parallel relationship with the straight line passing through the first power feeding portion and the first short-circuit portion. As described above, the straight line passing through the second power feeding portion 31a and the second short-circuit portion 32a has a vertical relationship with the straight line passing through the first power feeding portion 21a and the first short-circuit portion 22a. In addition, the first power feeding part 21a and the first short circuit part 22a and the second power feeding part 31a and the second short circuit part 32a are arranged so as to be symmetrical with respect to a center line C ′ that bisects a vertical straight line. Has been.
また、第１折り返しモノポールアンテナ素子２ａと第２折り返しモノポールアンテナ素子３ａとの関係についても、第１実施例では中心線を通りグラウンド板に垂直な面に面対称となるように配置される関係を有していたが、第２実施例では、図示の通り、中心線Ｃ'を通りグラウンド板１ａに垂直な面に面対称となるようにグラウンド板１ａの上に配置されている。 Further, the relationship between the first folded monopole antenna element 2a and the second folded monopole antenna element 3a is also arranged so as to be plane symmetric with respect to a plane passing through the center line and perpendicular to the ground plate in the first embodiment. However, in the second embodiment, as shown in the drawing, it is arranged on the ground plate 1a so as to be symmetrical with respect to a plane passing through the center line C 'and perpendicular to the ground plate 1a.
より具体的には、第１折り返しモノポールアンテナ素子２ａは、第１給電部２１ａからグラウンド板１ａに対して垂直方向（Ｚ軸方向）に立ち上がる。そして、第１給電部２１ａと第１短絡部２２ａを通る直線と垂直な直線方向且つ第２給電部３１ａ方向とは反対方向（−Ｙ軸方向）に曲がりグラウンド板１ａの端部の上までグラウンド板１ａに平行に延在する。次に、グラウンド板１ａに対して垂直方向（Ｚ軸方向）に再度立ち上がり、第１給電部２１ａ方向（Ｙ軸方向）に曲がり第１給電部２１ａからの総延長が所望の共振周波数の約４分の１波長となるまでグラウンド板１ａに平行に延在する。そして、第１短絡部２２ａ方向（−Ｘ軸方向）に曲がり第１短絡部２２ａと第２短絡部３２ａを通る直線の上までグラウンド板１ａに平行に延在する。その後、第１給電部２１ａと第１短絡部２２ａを通る直線と垂直な直線方向且つ第２給電部３１ａ方向とは反対方向（−Ｙ軸方向）に曲がりグラウンド板１ａの端部の上までグラウンド板１ａに平行に延在する。そして、グラウンド板１ａに対して垂直方向（−Ｚ軸方向）に立ち下がり、第１短絡部２２ａ方向（Ｙ軸方向）に曲がり第１短絡部２２ａの上までグラウンド板１ａに平行に延在する。最後に、グラウンド板１ａに対して垂直方向（−Ｚ軸方向）に再度立ち下がり、第１短絡部２２ａに接続されることで、第１折り返しモノポールアンテナ素子２ａが構成されている。 More specifically, the first folded monopole antenna element 2a rises in the vertical direction (Z-axis direction) with respect to the ground plate 1a from the first feeding portion 21a. And it bends in the linear direction perpendicular to the straight line passing through the first power feeding part 21a and the first short-circuiting part 22a and in the direction opposite to the direction of the second power feeding part 31a (-Y-axis direction), and reaches the ground up to the end of the ground plate 1a. It extends parallel to the plate 1a. Next, it rises again in the direction perpendicular to the ground plate 1a (Z-axis direction), bends in the direction of the first power feeding part 21a (Y-axis direction), and the total extension from the first power feeding part 21a is about 4 of the desired resonance frequency. It extends in parallel to the ground plate 1a until the wavelength is 1 / min. And it bends in the direction of the 1st short circuit part 22a (-X-axis direction), and extends in parallel with ground board 1a to on the straight line which passes along the 1st short circuit part 22a and the 2nd short circuit part 32a. After that, it bends in the linear direction perpendicular to the straight line passing through the first power supply portion 21a and the first short-circuit portion 22a and in the direction opposite to the direction of the second power supply portion 31a (the −Y-axis direction) to the top of the end of the ground plate 1a. It extends parallel to the plate 1a. Then, it falls in the direction perpendicular to the ground plate 1a (−Z-axis direction), bends in the direction of the first short-circuit portion 22a (Y-axis direction), and extends in parallel to the ground plate 1a up to the top of the first short-circuit portion 22a. . Finally, the first folded monopole antenna element 2a is configured by falling again in the vertical direction (−Z-axis direction) with respect to the ground plate 1a and being connected to the first short-circuit portion 22a.
同様に、第２折り返しモノポールアンテナ素子３ａは、第２給電部３１ａからグラウンド板１ａに対して垂直方向（Ｚ軸方向）に立ち上がる。そして、第２給電部３１ａと第２短絡部３２ａを通る直線と垂直な直線方向且つ第１給電部２１ａ方向とは反対方向（Ｘ軸方向）に曲がりグラウンド板１ａの端部の上までグラウンド板１ａに平行に延在する。次に、グラウンド板１ａに対して垂直方向（Ｚ軸方向）に再度立ち上がり、第２給電部３１ａ方向（−Ｘ軸方向）に曲がり第２給電部３１ａからの総延長が所望の共振周波数の約４分の１波長となるまでグラウンド板１ａに平行に延在する。そして、第２短絡部３２ａ方向（Ｙ軸方向）に曲がり第１短絡部２２ａと第２短絡部３２ａを通る直線の上までグラウンド板１ａに平行に延在する。その後、第２給電部３１ａと第２短絡部３２ａを通る直線と垂直な直線方向且つ第１給電部２１ａ方向とは反対方向（Ｘ軸方向）に曲がりグラウンド板１ａの端部の上までグラウンド板１ａに平行に延在する。そして、グラウンド板１ａに対して垂直方向（−Ｚ軸方向）に立ち下がり、第２短絡部３２ａ方向（−Ｘ軸方向）に曲がり第２短絡部３２ａの上までグラウンド板１ａに平行に延在する。最後に、グラウンド板１ａに対して垂直方向（−Ｚ軸方向）に再度立ち下がり、第２短絡部３２ａに接続されることで、第２折り返しモノポールアンテナ素子３ａが構成されている。 Similarly, the second folded monopole antenna element 3a rises in the vertical direction (Z-axis direction) with respect to the ground plate 1a from the second feeding portion 31a. Then, the ground plate bends in the linear direction perpendicular to the straight line passing through the second power feeding portion 31a and the second short-circuiting portion 32a and in the direction opposite to the first power feeding portion 21a direction (X-axis direction) to the end of the ground plate 1a. It extends parallel to la. Next, it rises again in the direction perpendicular to the ground plate 1a (Z-axis direction), bends in the direction of the second power feeding part 31a (−X-axis direction), and the total extension from the second power feeding part 31a is about the desired resonance frequency. It extends parallel to the ground plate 1a until it becomes a quarter wavelength. And it bends in the direction of the 2nd short circuit part 32a (Y-axis direction), and extends in parallel with ground plate 1a to on the straight line which passes along the 1st short circuit part 22a and the 2nd short circuit part 32a. Thereafter, the ground plate bends in a linear direction perpendicular to the straight line passing through the second power feeding portion 31a and the second short-circuiting portion 32a and in a direction opposite to the first power feeding portion 21a direction (X-axis direction) to above the end of the ground plate 1a. It extends parallel to la. Then, it falls in the direction perpendicular to the ground plate 1a (−Z axis direction), bends in the direction of the second short circuit portion 32a (−X axis direction), and extends in parallel to the ground plate 1a up to the second short circuit portion 32a. To do. Finally, the second folded monopole antenna element 3a is configured by falling again in the vertical direction (−Z axis direction) with respect to the ground plate 1a and being connected to the second short-circuit portion 32a.
そして、第２実施例でも、ブリッジ部４ａが、第１折り返しモノポールアンテナ素子２ａと第２折り返しモノポールアンテナ素子３ａとの間を短絡するように接続されている。即ち、ブリッジ部４ａは、第１短絡部又は第２短絡部からブリッジ部が接続される接続点までの電気的な長さとブリッジ部の電気的な長さの合計が略λ／４となるように構成されている。図示例では、第１短絡部２２ａに近い側の接続点Ｃ１と第２短絡部３２ａに近い側の接続点Ｃ２の間に接続されている。 Also in the second embodiment, the bridge portion 4a is connected so as to short-circuit between the first folded monopole antenna element 2a and the second folded monopole antenna element 3a. That is, the bridge portion 4a is configured such that the sum of the electrical length from the first short-circuit portion or the second short-circuit portion to the connection point to which the bridge portion is connected and the electrical length of the bridge portion is approximately λ / 4. It is configured. In the example of illustration, it connects between the connection point C1 near the 1st short circuit part 22a, and the connection point C2 near the 2nd short circuit part 32a.
また、ブリッジ部４ａの電気的な長さについても、第１実施例の場合と同様である。即ち、アンテナ素子間相互結合の量を最も低減するためには、第１短絡部２２ａから第１折り返しモノポールアンテナ素子２ａの接続点Ｃ１を通ってブリッジ部４ａを介して、第２折り返しモノポールアンテナ素子３ａの接続点Ｃ２を通って第２折り返しモノポールアンテナ素子３ａから第２短絡部３２ａまでの電気的な長さが、第１折り返しモノポールアンテナ素子２ａの第１給電部２１ａから折り返すまでの往路の電気的な長さに略等しいことが好ましい。また、第１折り返しモノポールアンテナ素子２ａの折り返すまでの往路の電気的な長さではなく、折り返した後の帰路の電気的な長さに略等しく構成されても良い。さらに、第２折り返しモノポールアンテナ素子３ａの第２給電部３１ａから折り返すまでの往路又は折り返した後の帰路の電気的な長さを基準にしても良い。即ち、ブリッジ部４ａの電気的な長さと、ブリッジ部４ａの各接続点Ｃ１，Ｃ２から各短絡部２２ａ，３２ａまでの電気的な長さの合計が、折り返しモノポールアンテナ素子の全長の約半分の電気的な長さに略等しくなるように、各接続点Ｃ１，Ｃ２の位置が決定されることが好ましい。 Also, the electrical length of the bridge portion 4a is the same as in the first embodiment. That is, in order to reduce the amount of mutual coupling between the antenna elements most, the second folded monopole passes through the connection point C1 of the first folded monopole antenna element 2a from the first short-circuited portion 22a through the bridge portion 4a. Until the electrical length from the second folded monopole antenna element 3a to the second short-circuit portion 32a through the connection point C2 of the antenna element 3a is folded back from the first feeding portion 21a of the first folded monopole antenna element 2a. It is preferable to be approximately equal to the electrical length of the outgoing path. Further, it may be configured to be substantially equal to the electrical length of the return path after being folded, not the electrical length of the forward path until the first folded monopole antenna element 2a is folded. Furthermore, the electrical length of the return path after returning from the second feeding portion 31a of the second folded monopole antenna element 3a or returning may be used as a reference. That is, the total of the electrical length of the bridge portion 4a and the electrical lengths from the connection points C1 and C2 of the bridge portion 4a to the short-circuit portions 22a and 32a is about half of the total length of the folded monopole antenna element. It is preferable that the positions of the connection points C1 and C2 are determined so as to be substantially equal to the electrical length.
ここで、アンテナ素子はグラウンド板１ａの端部の上まで延在することが好ましいが、図６ではグラウンド板１ａが図１や図２と比べて短く示されている。例えばグラウンド板１ａが回路基板上に設けられる場合には、基板自体はもっと大きくても良く、基板上に設けられるグラウンドパターンが図示のように所定の大きさになっており、この端部の上までアンテナ素子が延在するように構成されていれば良い。 Here, the antenna element preferably extends over the end of the ground plate 1a, but in FIG. 6, the ground plate 1a is shown shorter than in FIGS. For example, when the ground plate 1a is provided on the circuit board, the board itself may be larger, and the ground pattern provided on the board has a predetermined size as shown in FIG. It suffices if the antenna element is configured so as to extend up to.
本発明の折り返しモノポールアンテナでは、第２実施例のようにＬ字型に一対の折り返しモノポールアンテナ素子を配置した場合であっても、第１実施例と同様、ブリッジ部により第１折り返しモノポールアンテナ素子と第２折り返しモノポールアンテナ素子との間を短絡部側に近い側で短絡することにより、アンテナ素子間相互結合を大幅に低減でき、アンテナ効率を向上させることが可能となる。 In the folded monopole antenna of the present invention, even when a pair of folded monopole antenna elements are arranged in an L shape as in the second embodiment, the first folded monopole is provided by the bridge portion as in the first embodiment. By short-circuiting between the pole antenna element and the second folded monopole antenna element on the side close to the short-circuit portion side, mutual coupling between the antenna elements can be greatly reduced, and the antenna efficiency can be improved.
次に、ブリッジ部の接続点を短絡部から遠い側に接続した場合の例について説明する。図２や図６に示される例では、ブリッジ部は短絡部に近い側の接続点に接続される例であり、ブリッジ部が短絡部から接続点までの電気的な長さとブリッジ部の電気的な長さの合計が、具体的には略λ／４となるように構成されているものであった。次の例は、これが略λ・３／４となるものである。図７は、本発明の第１実施例の折り返しモノポールアンテナの他の変形例を説明するための概略斜視図である。図中、図１と同一の符号を付した部分は同一物を表わしている。 Next, an example when the connection point of the bridge portion is connected to the side far from the short-circuit portion will be described. In the examples shown in FIG. 2 and FIG. 6, the bridge portion is an example of being connected to a connection point on the side close to the short-circuit portion, and the bridge portion has an electrical length from the short-circuit portion to the connection point and the electrical power of the bridge portion. Specifically, the total length is approximately λ / 4. In the following example, this is approximately λ · 3/4. FIG. 7 is a schematic perspective view for explaining another modified example of the folded monopole antenna according to the first embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 1 denote the same parts.
図７における本発明の折り返しモノポールアンテナは、図示の通り、第１給電部２１及び第２給電部３１がグラウンド板１の端部側に配置され、第１短絡部２２及び第２短絡部３２がグラウンド板１の端部から遠い側に配置されている。そして、ブリッジ部４の接続点Ｃ１，Ｃ２は、第１給電部２１及び第２給電部３１側に配置されている。 In the folded monopole antenna of the present invention in FIG. 7, as shown in the figure, the first feeding part 21 and the second feeding part 31 are arranged on the end side of the ground plate 1, and the first shorting part 22 and the second shorting part 32. Is arranged on the side far from the end of the ground plate 1. And the connection points C1 and C2 of the bridge part 4 are arrange | positioned at the 1st electric power feeding part 21 and the 2nd electric power feeding part 31 side.
この場合、ブリッジ部４は、折り返しモノポールアンテナ素子２，３の全長（λ／２）の約半分の電気的な長さ（λ／４）に、折り返しモノポールアンテナ素子の全長（λ／２）を加えた電気的な長さ（λ・３／４）になるように構成されている。短絡部から遠い側、即ち、給電部側に近い位置にブリッジ部を接続する場合には、ブリッジ部の電気的な長さを調整することで、短絡部からブリッジ部が接続される接続点までの電気的な長さとブリッジ部の電気的な長さの合計がλ・３／４となるようにすれば良い。なお、図示例では、ブリッジ部４の接続点Ｃ１，Ｃ２が各給電部２１，３１側に配置される例を示したが、本発明はこれに限定されず、図２や図６に示される例のように、接続点が各短絡部側に配置されるものであっても良い。この場合でも、短絡部からブリッジ部が接続される接続点までの電気的な長さとブリッジ部の電気的な長さの合計がλ・３／４となるようにブリッジ部の電気的な長さを調整すれば良い。 In this case, the bridge portion 4 has an electrical length (λ / 4) that is approximately half the total length (λ / 2) of the folded monopole antenna elements 2 and 3, and the total length (λ / 2) of the folded monopole antenna elements. ) Is added to the electrical length (λ · 3/4). When connecting the bridge part to the side far from the short circuit part, that is, the position close to the power supply part side, by adjusting the electrical length of the bridge part, from the short circuit part to the connection point where the bridge part is connected The sum of the electrical length and the electrical length of the bridge portion may be λ · 3/4. In the illustrated example, the connection points C1 and C2 of the bridge unit 4 are arranged on the power feeding units 21 and 31 side. However, the present invention is not limited to this, and is illustrated in FIGS. 2 and 6. A connection point may be arrange | positioned at each short circuit part side like an example. Even in this case, the electrical length of the bridge portion is such that the sum of the electrical length from the short-circuit portion to the connection point to which the bridge portion is connected and the electrical length of the bridge portion is λ · 3/4. You can adjust.
このように、本発明の折り返しモノポールアンテナでは、短絡部からブリッジ部が接続される接続点までの電気的な長さとブリッジ部の電気的な長さの合計が、略λ／４又はλ・３／４となるように構成されれば良い。 Thus, in the folded monopole antenna of the present invention, the sum of the electrical length from the short-circuit portion to the connection point to which the bridge portion is connected and the electrical length of the bridge portion is approximately λ / 4 or λ · What is necessary is just to be comprised so that it may become 3/4.
そして、配置するスペースが許されるようであれば、短絡部からブリッジ部が接続される接続点までの電気的な長さとブリッジ部の電気的な長さの合計は、λ・ｎ／４（但し、ｎは奇数）の電気的な長さとなるように構成することも可能である。即ち、本発明において、ブリッジ部は、λ・１／４，λ・３／４，λ・５／４・・・というように、１／４に対して１／２ずつ伸びた位置に、一対の折り返しモノポールアンテナ素子間のアンテナ素子間相互結合が低くなる点が存在する特徴を有している。なお、図示例では、ブリッジ部４がグラウンド板１上からはみ出していない状態のものを示したが、本発明はこれに限定されず、グラウンド板１上を越えてブリッジ部が設けられるものであっても良い。 If the space to be arranged is allowed, the sum of the electrical length from the short-circuit portion to the connection point to which the bridge portion is connected and the electrical length of the bridge portion is λ · n / 4 (however, , N is an odd number). That is, in the present invention, the bridge portion is paired at a position extended by ½ with respect to ¼, such as λ · ¼, λ · 3/4, λ · 5/4. There is a feature that the mutual coupling between the antenna elements between the folded monopole antenna elements becomes low. In the illustrated example, the bridge portion 4 does not protrude from the ground plate 1, but the present invention is not limited to this, and the bridge portion is provided beyond the ground plate 1. May be.
また、給電部側に近い位置にブリッジ部を接続するようにした例は、図６に示される第２実施例のような折り返しモノポールアンテナ素子がＬ字型になるようにグラウンド板の角に配置されるものであっても適用可能である。この場合、例えば図６において、給電部２１ａ，３１ａ側に近い位置にブリッジ部４ａが接続され、グラウンド板１ａの内側のスペース上でブリッジ部４ａの電気的な長さを調整し、短絡部２２ａ，３２ａからブリッジ部４ａが接続される接続点までの電気的な長さとブリッジ部４ａの電気的な長さの合計が、略λ・３／４となるように構成されれば良い。 Further, in the example in which the bridge portion is connected at a position close to the feeding portion side, the folded monopole antenna element as in the second embodiment shown in FIG. Even if it is arranged, it is applicable. In this case, for example, in FIG. 6, the bridge portion 4a is connected to a position close to the power feeding portions 21a and 31a side, the electrical length of the bridge portion 4a is adjusted on the space inside the ground plate 1a, and the short-circuit portion 22a. , 32a to the connection point to which the bridge portion 4a is connected and the total electrical length of the bridge portion 4a may be approximately λ · 3/4.
なお、本発明の折り返しモノポールアンテナは、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。 It should be noted that the folded monopole antenna of the present invention is not limited to the illustrated example described above, and it is needless to say that various modifications can be made without departing from the gist of the present invention.
１ グラウンド板
２ 第１折り返しモノポールアンテナ素子
３ 第２折り返しモノポールアンテナ素子
４ ブリッジ部
２１ 第１給電部
２２ 第１短絡部
３１ 第２給電部
３２ 第２短絡部
DESCRIPTION OF SYMBOLS 1 Ground plate 2 1st return monopole antenna element 3 2nd return monopole antenna element 4 Bridge part 21 1st electric power feeding part 22 1st short circuit part 31 2nd electric power feeding part 32 2nd short circuit part
Claims (5)
前記グラウンド板上に配置される第１給電部及び第１短絡部と、
前記グラウンド板上に配置される第２給電部及び第２短絡部であって、第２給電部と第２短絡部を通る直線が第１給電部と第１短絡部を通る直線と平行な直線上に配置され、且つ、第１給電部及び第１短絡部と、第２給電部及び第２短絡部とが、平行な直線間の中心線に対して線対称となるように配置される、第２給電部及び第２短絡部と、
前記グラウンド板の上に配置され、第１給電部から延在し第１短絡部でグラウンド板に短絡される第１折り返しモノポールアンテナ素子と、
第２給電部から延在し第２短絡部でグラウンド板に短絡される第２折り返しモノポールアンテナ素子であって、第１折り返しモノポールアンテナ素子と第２折り返しモノポールアンテナ素子が、前記平行な直線間の中心線を通りグラウンド板に垂直な面に面対称となるようにグラウンド板の上に配置される、第２折り返しモノポールアンテナ素子と、
第１折り返しモノポールアンテナ素子と第２折り返しモノポールアンテナ素子との間を短絡するブリッジ部であって、第１短絡部又は第２短絡部からブリッジ部が接続される接続点までの電気的な長さとブリッジ部の電気的な長さの合計が略λ・ｎ／４（但し、λは所望の共振周波数の波長、ｎは奇数）となるように構成されるブリッジ部と、
を具備することを特徴とする折り返しモノポールアンテナ。 A ground plate made of a conductor;
A first power supply unit and a first short-circuit unit disposed on the ground plate;
A straight line passing through the second power feeding part and the second short-circuiting part is parallel to a straight line passing through the first power feeding part and the first short-circuiting part, the second power feeding part and the second shorting part arranged on the ground plate. The first power feeding unit and the first short-circuit unit, and the second power feeding unit and the second short-circuit unit are arranged so as to be line-symmetric with respect to the center line between the parallel straight lines. A second feeding part and a second short-circuit part;
A first folded monopole antenna element disposed on the ground plate, extending from the first power feeding portion and short-circuited to the ground plate at the first short-circuit portion;
A second folded monopole antenna element that extends from the second feeding section and is short-circuited to the ground plate by the second short-circuit section, wherein the first folded monopole antenna element and the second folded monopole antenna element are parallel to each other. A second folded monopole antenna element disposed on the ground plate so as to be symmetrical with respect to a plane perpendicular to the ground plate through a center line between the straight lines;
A bridge portion that short-circuits between the first folded monopole antenna element and the second folded monopole antenna element, and is electrically connected from the first short-circuit portion or the second short-circuit portion to a connection point to which the bridge portion is connected. A bridge portion configured such that the sum of the length and the electrical length of the bridge portion is approximately λ · n / 4 (where λ is a wavelength of a desired resonance frequency and n is an odd number);
A folded monopole antenna characterized by comprising:
前記第１折り返しモノポールアンテナ素子は、第１給電部からグラウンド板に対して垂直方向に立ち上がり、第２給電部方向とは反対方向に曲がりグラウンド板の端部の上までグラウンド板に平行に延在し、グラウンド板に対して垂直方向に再度立ち上がり、第１給電部方向に曲がり第１給電部からの総延長が所望の共振周波数の約４分の１波長となるまでグラウンド板に平行に延在し、第１短絡部方向に曲がり第１短絡部と第２短絡部を通る直線の上までグラウンド板に平行に延在し、第２短絡部方向とは反対方向に曲がりグラウンド板の端部の上までグラウンド板に平行に延在し、グラウンド板に対して垂直方向に立ち下がり、第１短絡部方向に曲がり第１短絡部の上までグラウンド板に平行に延在し、グラウンド板に対して垂直方向に再度立ち下がり、第１短絡部に接続され、
前記第２折り返しモノポールアンテナ素子は、第２給電部からグラウンド板に対して垂直方向に立ち上がり、第１給電部方向とは反対方向に曲がりグラウンド板の端部の上までグラウンド板に平行に延在し、グラウンド板に対して垂直方向に再度立ち上がり、第２給電部方向に曲がり第２給電部からの総延長が所望の共振周波数の約４分の１波長となるまでグラウンド板に平行に延在し、第２短絡部方向に曲がり第１短絡部と第２短絡部を通る直線の上までグラウンド板に平行に延在し、第１短絡部方向とは反対方向に曲がりグラウンド板の端部の上までグラウンド板に平行に延在し、グラウンド板に対して垂直方向に立ち下がり、第２短絡部方向に曲がり第２短絡部の上までグラウンド板に平行に延在し、グラウンド板に対して垂直方向に再度立ち下がり、第２短絡部に接続される、
ことを特徴とする折り返しモノポールアンテナ。 The folded monopole antenna according to claim 1,
The first folded monopole antenna element rises in a direction perpendicular to the ground plate from the first feeding portion, bends in a direction opposite to the direction of the second feeding portion, and extends in parallel to the ground plate up to the end of the ground plate. It rises again in the direction perpendicular to the ground plate, bends in the direction of the first feed section and extends parallel to the ground plate until the total extension from the first feed section is about a quarter wavelength of the desired resonant frequency. And bends in the direction of the first short circuit part, extends in parallel with the ground plate up to the straight line passing through the first short circuit part and the second short circuit part, and bends in the direction opposite to the second short circuit part direction. It extends in parallel to the ground plate to the top, falls in a direction perpendicular to the ground plate, bends in the direction of the first short-circuited portion, extends in parallel to the ground plate to the top of the first short-circuited portion, and to the ground plate Vertically Falling time Standing, connected to the first short circuit portion,
The second folded monopole antenna element rises in a direction perpendicular to the ground plate from the second feeding portion, bends in a direction opposite to the direction of the first feeding portion, and extends in parallel with the ground plate to the end of the ground plate. It rises again in the direction perpendicular to the ground plate, bends in the direction of the second feed section and extends parallel to the ground plate until the total extension from the second feed section is about one quarter wavelength of the desired resonant frequency. And bends in the direction of the second short-circuit portion, extends in parallel with the ground plate up to a straight line passing through the first short-circuit portion and the second short-circuit portion, and bends in the direction opposite to the first short-circuit portion direction. It extends in parallel to the ground plate to the top, falls in a direction perpendicular to the ground plate, bends in the direction of the second short circuit portion, extends in parallel to the ground plate to the top of the second short circuit portion, and to the ground plate Vertically Falling time Standing, it is connected to the second short circuit portion,
A folded monopole antenna characterized by that.
前記グラウンド板上に配置される第１給電部及び第１短絡部と、
前記グラウンド板上に配置される第２給電部及び第２短絡部であって、第２給電部と第２短絡部を通る直線が第１給電部と第１短絡部を通る直線と垂直な直線上に配置され、且つ、第１給電部及び第１短絡部と、第２給電部及び第２短絡部とが、前記垂直な直線間を二分する中心線に対して線対称となるように配置される、第２給電部及び第２短絡部と、
前記グラウンド板の上に配置され、第１給電部から延在し第１短絡部でグラウンド板に短絡される第１折り返しモノポールアンテナ素子と、
第２給電部から延在し第２短絡部でグラウンド板に短絡される第２折り返しモノポールアンテナ素子であって、第１折り返しモノポールアンテナ素子と第２折り返しモノポールアンテナ素子が、前記垂直な直線間を二分する中心線を通りグラウンド板に垂直な面に面対称となるようにグラウンド板の上に配置される、第２折り返しモノポールアンテナ素子と、
第１折り返しモノポールアンテナ素子と第２折り返しモノポールアンテナ素子との間を短絡するブリッジ部であって、第１短絡部又は第２短絡部からブリッジ部が接続される接続点までの電気的な長さとブリッジ部の電気的な長さの合計が略λ・ｎ／４（但し、λは所望の共振周波数の波長、ｎは奇数）となるように構成されるブリッジ部と、
を具備することを特徴とする折り返しモノポールアンテナ。 A ground plate made of a conductor;
A first power supply unit and a first short-circuit unit disposed on the ground plate;
A second power feeding unit and a second short circuit unit disposed on the ground plate, and a straight line passing through the second power feeding unit and the second short circuit unit is perpendicular to a straight line passing through the first power feeding unit and the first short circuit unit. Arranged so that the first feeding portion and the first short-circuit portion, and the second feeding portion and the second short-circuit portion are line-symmetric with respect to the center line that bisects the perpendicular straight line. A second power feeding unit and a second short-circuit unit,
A first folded monopole antenna element disposed on the ground plate, extending from the first power feeding portion and short-circuited to the ground plate at the first short-circuit portion;
A second folded monopole antenna element that extends from the second feeding portion and is short-circuited to the ground plate by the second short-circuit portion, wherein the first folded monopole antenna element and the second folded monopole antenna element are perpendicular to each other. A second folded monopole antenna element disposed on the ground plate so as to be plane-symmetric with respect to a plane perpendicular to the ground plate through a center line that bisects the straight line;
A bridge portion that short-circuits between the first folded monopole antenna element and the second folded monopole antenna element, and is electrically connected from the first short-circuit portion or the second short-circuit portion to a connection point to which the bridge portion is connected. A bridge portion configured such that the sum of the length and the electrical length of the bridge portion is approximately λ · n / 4 (where λ is a wavelength of a desired resonance frequency and n is an odd number);
A folded monopole antenna characterized by comprising:
前記第１折り返しモノポールアンテナ素子は、第１給電部からグラウンド板に対して垂直方向に立ち上がり、第１給電部と第１短絡部を通る直線と垂直な直線方向且つ第２給電部方向とは反対方向に曲がりグラウンド板の端部の上までグラウンド板に平行に延在し、グラウンド板に対して垂直方向に再度立ち上がり、第１給電部方向に曲がり第１給電部からの総延長が所望の共振周波数の約４分の１波長となるまでグラウンド板に平行に延在し、第１短絡部方向に曲がり第１短絡部と第２短絡部を通る直線の上までグラウンド板に平行に延在し、第１給電部と第１短絡部を通る直線と垂直な直線方向且つ第２給電部方向とは反対方向に曲がりグラウンド板の端部の上までグラウンド板に平行に延在し、グラウンド板に対して垂直方向に立ち下がり、第１短絡部方向に曲がり第１短絡部の上までグラウンド板に平行に延在し、グラウンド板に対して垂直方向に再度立ち下がり、第１短絡部に接続され、
前記第２折り返しモノポールアンテナ素子は、第２給電部からグラウンド板に対して垂直方向に立ち上がり、第２給電部と第２短絡部を通る直線と垂直な直線方向且つ第１給電部方向とは反対方向に曲がりグラウンド板の端部の上までグラウンド板に平行に延在し、グラウンド板に対して垂直方向に再度立ち上がり、第２給電部方向に曲がり第２給電部からの総延長が所望の共振周波数の約４分の１波長となるまでグラウンド板に平行に延在し、第２短絡部方向に曲がり第１短絡部と第２短絡部を通る直線の上までグラウンド板に平行に延在し、第２給電部と第２短絡部を通る直線と垂直な直線方向且つ第１給電部方向とは反対方向に曲がりグラウンド板の端部の上までグラウンド板に平行に延在し、グラウンド板に対して垂直方向に立ち下がり、第２短絡部方向に曲がり第２短絡部の上までグラウンド板に平行に延在し、グラウンド板に対して垂直方向に再度立ち下がり、第２短絡部に接続される、
ことを特徴とする折り返しモノポールアンテナ。 The folded monopole antenna according to claim 3,
The first folded monopole antenna element rises in a direction perpendicular to the ground plate from the first feeding part, and is a linear direction perpendicular to a straight line passing through the first feeding part and the first short-circuiting part and a second feeding part direction. Bend in the opposite direction to extend above the end of the ground plate in parallel to the ground plate, rise up again in the direction perpendicular to the ground plate, turn in the direction of the first power feed section, and total extension from the first power feed section is desired Extends in parallel to the ground plate until the wavelength is about a quarter of the resonance frequency, bends in the direction of the first short-circuited portion and extends in parallel to the ground plate up to a straight line passing through the first short-circuited portion and the second short-circuited portion And bends in a straight line direction perpendicular to the straight line passing through the first power feeding part and the first short-circuit part and in a direction opposite to the direction of the second power feeding part, and extends in parallel to the ground board up to the end of the ground board, Falling vertically to Ri, extending parallel to the ground plate to the top of the first short circuit portion bent in a first short-circuit portion direction, again falls to a direction perpendicular to the ground plate, is connected to the first short circuit portion,
The second folded monopole antenna element rises in a direction perpendicular to the ground plate from the second feeding part, and is a linear direction perpendicular to the straight line passing through the second feeding part and the second short-circuiting part and the first feeding part direction. Bend in the opposite direction to extend above the end of the ground plate in parallel to the ground plate, rise up again in the direction perpendicular to the ground plate, turn in the direction of the second power feed section, and total extension from the second power feed section is desired Extends in parallel to the ground plate until the wavelength is about a quarter of the resonance frequency, bends in the direction of the second short-circuit portion, and extends in parallel to the ground plate to a straight line passing through the first short-circuit portion and the second short-circuit portion And bends in a linear direction perpendicular to the straight line passing through the second power feeding part and the second short-circuiting part and in a direction opposite to the first power feeding part direction and extends in parallel to the ground board up to the end of the ground board, Falling vertically to Ri, extending parallel to the ground plate to the top of the second short circuit portion bent in a second short-circuit portion direction, again falls to a direction perpendicular to the ground plate is connected to the second short circuit portion,
A folded monopole antenna characterized by that.
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| JPS52106660A (en) * | 1976-03-04 | 1977-09-07 | Hitoshi Tokumaru | Antenna |
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