JP2006014265A - Wideband element and wideband antenna including its element - Google Patents
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Abstract
Description
本発明は、パソコン、PDA(携帯型情報機器)、携帯電話、あるいはVICSなどの情報端末機器等に内蔵させる広帯域の放射電極エレメント(以下、“エレメント”と称する。)、及び該エレメントを含む広帯域アンテナに関するものである。更に詳しくは、本発明は取り分け広帯域での通信感度に優れた小型アンテナに関するものである。 The present invention relates to a broadband radiation electrode element (hereinafter referred to as “element”) incorporated in an information terminal device such as a personal computer, a PDA (portable information device), a cellular phone, or a VICS, and a broadband including the element. It relates to antennas. More specifically, the present invention relates to a small antenna having excellent communication sensitivity in a wide band.
近年、無線LANあるいはBluetooth(近距離無線データ通信システム)搭載のPDA等においては、アンテナの多周波化とともに小型化の要求がますます強くなってきている。
多周波化の一例として、複数の閉ループ素子(エレメント)からなるアンテナが提案されている。(特許文献1)
しかしながら、この提案のアンテナは帯域が広い反面、放射器、導波器、及び連結部で構成されているためエレメント形状が複雑であるばかりでなく、製造工数が掛かるという問題がある。更に、寸法的にも小型化が実現できないという限界もかかえている。
In recent years, in a PDA or the like equipped with a wireless LAN or Bluetooth (short-range wireless data communication system), there is an increasing demand for downsizing as the frequency of the antenna increases.
As an example of increasing the frequency, an antenna composed of a plurality of closed loop elements (elements) has been proposed. (Patent Document 1)
However, this proposed antenna has a wide band, but has a problem that not only the element shape is complicated but also the number of manufacturing steps is increased because the antenna is composed of a radiator, a director, and a connecting portion. Furthermore, there is a limit that size reduction cannot be realized.
したがって、本発明の課題は、パソコン、あるいはPDA等の情報端末機器等の内に組込まれ、その際、通信感度に優れ、しかも小型で構造がシンプルな広帯域エレメント、更には該エレメントを使用した広帯域アンテナを提供することにある。 Accordingly, an object of the present invention is to be incorporated in an information terminal device such as a personal computer or a PDA, and at that time, a broadband element having excellent communication sensitivity, a small size and a simple structure, and a broadband using the element. It is to provide an antenna.
本発明者等は、細幅状導体によって取り囲まれ、開放端のないスリット(以下、“閉スリット“と称する)の複数個と、放射電極としての細幅状導体とを組み合わせることを想起し、さらに検討した結果、所望のエレメントを実現するに至った。
そして、アンテナとしての更なる小型化を図るため、グランド板を該エレメントから電気的に分離しつつも、該細幅状導体部分に単一の高周波同軸ケーブルの内部導体を、同時に、グランド板には該ケーブルの外部導体を接続することに着目した。
The present inventors recall that combining a plurality of slits (hereinafter referred to as “closed slits”) surrounded by narrow conductors and having no open ends, and narrow conductors as radiation electrodes, As a result of further investigation, the desired element was realized.
In order to further reduce the size of the antenna, while the ground plate is electrically separated from the element, the inner conductor of a single high-frequency coaxial cable is connected to the narrow conductor portion at the same time as the ground plate. Focused on connecting the outer conductor of the cable.
本発明によれば、細幅状導体を放射電極とし同時に、該導体により取り囲んで形成した複数個の閉スリットをスリットアンテナエレメントとしたエレメント構成を採ることにより、小型且つ広帯域アンテナへの対応を実現したものである。これを、従来と比較した場合、帯域幅が大幅に拡大されるという格別顕著な効果が奏される。更に、エレメントの幅、高さとも小さくなり且つ、グランド板も該エレメントに直接付随しないので、エレメント自体が可及的に小型化され、取付けスペースの大幅な削減につながるという効果も同時に奏される。更に、立体状エレメントに構成した場合には、インピーダンス調整が容易になるという付加的効果も期待できる。
又、グランド板をエレメントから分離・別体とすることは、各種の配設方法を可能にするもので、取付け自由度も増加する。この結果、本発明のエレメントはパソコン等の情報端末機器内蔵用アンテナとして極めて有用である。
According to the present invention, by adopting an element configuration in which a narrow-width conductor is used as a radiation electrode and a plurality of closed slits surrounded by the conductor is used as a slit antenna element, a small and wide band antenna can be realized. It is a thing. When this is compared with the prior art, a particularly remarkable effect is achieved in that the bandwidth is greatly expanded. Furthermore, since the width and height of the element are reduced and the ground plate is not directly attached to the element, the element itself can be miniaturized as much as possible and the installation space can be greatly reduced. . Furthermore, when it is configured as a three-dimensional element, an additional effect that impedance adjustment becomes easy can be expected.
In addition, separating the ground plate from the element and making it a separate body enables various arrangement methods and increases the degree of freedom of attachment. As a result, the element of the present invention is extremely useful as an antenna for incorporating information terminal equipment such as a personal computer.
以下、本発明を、添付図面に基づいて説明する。
図1は、本発明に係る広帯域エレメントの一例を示す平面図である。
図2は、図1のエレメントを含むアンテナの一例を示す斜視図である。
図3は、図2のアンテナの周波数特性(VSWR特性)を示す図(グラフ)である。
図4は、本発明に係る広帯域エレメントの他の態様を示す平面図である。
図5は、図4の広帯域アンテナの周波数特性(VSWR特性)を示す図である。
図6は、本発明に係る広帯域エレメントの更に他の態様を示す平面図である。
図7は、本発明に係る広帯域エレメントの更に別の態様を示す平面図である。
図8は、本発明に係る広帯域エレメントの更に別の態様を示す斜視図である。
Hereinafter, the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a plan view showing an example of a broadband element according to the present invention.
FIG. 2 is a perspective view showing an example of an antenna including the element of FIG.
FIG. 3 is a diagram (graph) showing frequency characteristics (VSWR characteristics) of the antenna of FIG.
FIG. 4 is a plan view showing another embodiment of the broadband element according to the present invention.
FIG. 5 is a diagram illustrating frequency characteristics (VSWR characteristics) of the wideband antenna of FIG.
FIG. 6 is a plan view showing still another aspect of the broadband element according to the present invention.
FIG. 7 is a plan view showing still another aspect of the broadband element according to the present invention.
FIG. 8 is a perspective view showing still another aspect of the broadband element according to the present invention.
先ず、本発明の基本的概念について、図1〜図3を参照しながら述べる。
図1には、3個の閉スリットを設けて、2.5GHz〜10.6GHzの範囲で広帯域化を実現した“目”の字状の平板エレメントが示されている。その際、(1)はエレメント、(2)は細幅状導体、(3)は細幅状導体(2)によって取り囲まれた閉スリット、(L1)はエレメント(1)の長手方向の長さ、(L2)はエレメント(1)の幅方向の長さ、(L3)は閉スリット(3)の長さ、(L4)は閉スリット(3)の幅、(L5)は細幅状導体(2)の幅、そして、(S1)は、高周波同軸ケーブルの内部導体が接続される給電点である。
図2には、上記の平板エレメントを含むアンテナが示されている。該図において、(1)、(2)、(3)及び(S1)の符号は図1の場合と同じである。他方、(4)は、エレメント(1)とは電気的に非接続状態にあるグランド板、(5)は給電用同軸ケーブル、(5a)は給電用同軸ケーブル(5)の内部導体、(5b)は給電用同軸ケーブル(5)の外部導体、そして、(S2)はアースポイントである。
図2のアンテナを、後揚の実施例に示す材質と寸法で作成し、その実験結果であるアンテナの周波数特性(VSWR特性)を示したのが図3である。
First, the basic concept of the present invention will be described with reference to FIGS.
FIG. 1 shows an “eye” -shaped flat plate element that is provided with three closed slits and realizes a wide band in the range of 2.5 GHz to 10.6 GHz. In this case, (1) is an element, (2) is a narrow conductor, (3) is a closed slit surrounded by the narrow conductor (2), and (L1) is the length in the longitudinal direction of the element (1). , (L2) is the length in the width direction of the element (1), (L3) is the length of the closed slit (3), (L4) is the width of the closed slit (3), and (L5) is a narrow conductor ( The width of 2) and (S1) are feed points to which the inner conductor of the high-frequency coaxial cable is connected.
FIG. 2 shows an antenna including the flat plate element. In the figure, the symbols (1), (2), (3) and (S1) are the same as those in FIG. On the other hand, (4) is a ground plate electrically disconnected from the element (1), (5) is a coaxial cable for feeding, (5a) is an inner conductor of the coaxial cable for feeding (5), (5b ) Is an outer conductor of the feeding coaxial cable (5), and (S2) is a ground point.
FIG. 3 shows the frequency characteristics (VSWR characteristics) of the antenna, which are the experimental results of the antenna shown in FIG.
上記の態様で特徴的なことは、グランド板(4)と電気的に非接続状態の細幅状導体(2)を利用して3個の閉スリット(3)を形成したこと、及び、給電点(S1)を細幅状導体(2)に設けたことにある。こうすることにより、図3に示すように、VSWRが2以下の範囲が2.5GHz〜10.6GHzという、これまでにない超広帯域に渡っての広帯域化が実現できる。
この点について再度、図1〜図3を参照しながら、更に詳細に説明する。
先ず、図1及び図2に示すように、細幅状導体(2)に設けられた給電点(S1)からの高周波電流は左右に分散するだけでなく、細幅状導体(2)のエレメント長が異なる各種経路を辿って流れ、これとともに、基本波のみでなく、倍周波等の高調波を含めた高周波電磁界が発生して多くの共振点が生じる。このとき、細幅状導体(2)は2.5GHz〜10.6GHzの範囲に多くの共振点を有する、モノポールアンテナエレメントとして機能することになる。同時に、夫々の閉スリット(3)は細幅状導体(2)と同様、2.5GHz〜10.6GHzの範囲に多くの共振点を有する、スリットアンテナエレメントとして機能する。
細幅状導体(2)及び夫々の閉スリット(3)を上記の周波数で共振させるためには、エレメント(1)の長手方向の長さ(L1)、エレメント(1)の幅方向の長さ(L2)、閉スリット(3)の長さ(L3)、閉スリット(3)の幅(L4)、及び細幅状導体(2)の幅(L5)を夫々に適宜な値に調整すればよい。図1〜図2の例で言えば、2.5GHzが下限であるので、給電点から最長パスが4分の1波長以上になるよう設定すればよい。その際、夫々の閉スリット(3)の幅(L4)はスリットアンテナエレメントとして安定に機能させるため、0.1mm〜4mmであることが好ましく、特に0.5mm〜1.5mmが好ましい範囲である。同時に、細幅状導体(2)の幅(L5)はリターンロスあるいはVSWR等アンテナ特性を考慮して1mm〜5mmの範囲から適宜採択する。
細幅状導体(2)の材質としては、洋白(白銅)、銅、鉄、あるいは黄銅等の導電性の金属が望ましい。その中でも洋白(白銅)が強度、加工性、耐腐食性に優れているので、特に好ましい。又、厚さについては格段の制約はなく、強度を考慮した適切な厚さとすればよい。
本発明において、給電点(S1)の位置は重要である。図2のアンテナにおいては、グランド板(4)に最も近い側の該細幅状導体部分に給電点(S1)を設けている。この理由は、広帯域化を実現するため、できるだけ多くのエレメント長が異なる経路を設けて、多くの共振点を生じさせるためである。その際、給電点(S1)の位置がエレメント(1)のほぼ中央に位置していると、高周波電流が細幅状導体部分上で均等に分散するので、より安定化する。
What is characteristic in the above aspect is that the three closed slits (3) are formed by using the narrow conductor (2) that is not electrically connected to the ground plate (4), and the power supply The point (S1) is provided in the narrow conductor (2). By doing so, as shown in FIG. 3, it is possible to realize an unprecedented ultra-wideband, that is, a range where VSWR is 2 or less is 2.5 GHz to 10.6 GHz.
This point will be described in more detail with reference to FIGS. 1 to 3 again.
First, as shown in FIGS. 1 and 2, the high-frequency current from the feeding point (S1) provided in the narrow conductor (2) is not only distributed to the left and right, but also the elements of the narrow conductor (2). Along with this, various high-frequency electromagnetic fields including not only the fundamental wave but also harmonics such as the double frequency are generated and many resonance points are generated. At this time, the narrow conductor (2) functions as a monopole antenna element having many resonance points in the range of 2.5 GHz to 10.6 GHz. At the same time, each closed slit (3) functions as a slit antenna element having many resonance points in the range of 2.5 GHz to 10.6 GHz, like the narrow conductor (2).
In order to resonate the narrow conductor (2) and the respective closed slits (3) at the above frequency, the length (L1) in the longitudinal direction of the element (1) and the length in the width direction of the element (1) (L2) If the length (L3) of the closed slit (3), the width (L4) of the closed slit (3), and the width (L5) of the narrow conductor (2) are adjusted to appropriate values, respectively. Good. In the example of FIGS. 1 and 2, since 2.5 GHz is the lower limit, the longest path from the feeding point may be set to be a quarter wavelength or more. At that time, the width (L4) of each closed slit (3) is preferably 0.1 mm to 4 mm, particularly preferably 0.5 mm to 1.5 mm in order to function stably as a slit antenna element. . At the same time, the width (L5) of the narrow conductor (2) is appropriately selected from a range of 1 mm to 5 mm in consideration of antenna characteristics such as return loss or VSWR.
The material of the narrow conductor (2) is preferably a conductive metal such as white (brass), copper, iron, or brass. Among them, white (white copper) is particularly preferable because it is excellent in strength, workability, and corrosion resistance. The thickness is not particularly limited, and may be an appropriate thickness considering the strength.
In the present invention, the position of the feeding point (S1) is important. In the antenna of FIG. 2, a feeding point (S1) is provided on the narrow conductor portion closest to the ground plate (4). The reason for this is to provide as many resonance points as possible by providing paths with different element lengths as much as possible in order to realize a wide band. At that time, if the position of the feeding point (S1) is located at the approximate center of the element (1), the high-frequency current is evenly distributed on the narrow conductor portion, so that it is further stabilized.
更に、本発明において、グランド板(4)をエレメント(1)とは電気的に絶縁・分離して別体化した理由は、以下のとおりである。
通常、エレメントとグランド板とは短絡板(あるいは短絡部)を介して一体的に接続されている。他方、アンテナを設置するパソコン等の機器はマグネシウム等の金属からなる筐体で構成されている。本発明では、この筐体を、エレメントとは電気的に非接続状態のグランド板として利用することで、前記の短絡板及び該短絡板に繋がるグランド板の両方が省略され、アンテナエレメントの大幅な小型化が実現できるからである。
このアンテナへの給電にあたっては、高周波同軸ケーブル等の給電線(5)の内部導体(5a)を前述の給電点(S1)と接続し他方、該ケーブルの外部導体(5b)をグランド板(4)に設けられたアースポイント(S2)に接続すればよい。高周波同軸ケーブル(5)としては、周知のフッ素樹脂被覆等の高周波同軸ケーブルが採用される。高周波同軸ケーブル(5)を給電点(S1)およびアースポイント(S2)に接続するには、ハンダ付あるいは超音波接続等を利用すればよい。
以上の態様は、エレメント(1)とグランド板(4)とを同一平面上で平行に配設した例である。しかしながら、両者は必ずしも平行である必要はなく、互いに所望の角度、例えば90度回転した位相で配設されてもよい。その他、不平行等のスペースに応じた各種の配設方法が採用される。
本発明のエレメントには種々の態様がある。これらについて、図4、図6、図7及び図8を参照しながら説明する。
図4の態様は、閉スリットを2個設けたもので、図1のものが目の字状であるのに対して、“日”の字状となっている。この場合、図1の平板エレメントに比べて構成が簡略化される。ただ、高周波電流の電流経路が減少し、共振点も減少するので、図5に示すように、周波数特性(VSWR)が2以下の範囲が、3GHz〜6GHzと若干、広帯域化される範囲が狭くなる。
更に、図6には台形形状の平板エレメントが、そして、図7には、図1の日の字状エレメントを横2列に配置した、いわゆる“田”の字形状の平板エレメントが示されている。この他、インピーダンス調整を容易にするため、エレメントの一部から突起状の細幅状導体を形成したり、あるいは給電点付近のエレメントの一部を円弧状にする態様等、各種態様が考えられる。
最後に、図8の態様は上述の平板エレメントの2枚を互いに対向・接続させて立体形状に構成したものである。この構成ではインピーダンス調整がより容易となる。なぜなら、この場合には、2枚の平板状エレメント間の対向距離(L6)を調整することで、図1〜図7の態様に比べて、インピーダンス調整の自由度が増すからである。
この図8では、2枚の平板エレメントを対向・接続させた態様を示したが、立体形状については、これに限ることなく、3枚以上としたり、あるいは、ブロック状とする等各種の態様がある。
Furthermore, in the present invention, the reason why the ground plate (4) is separated from the element (1) by being electrically insulated and separated is as follows.
Usually, the element and the ground plate are integrally connected via a short-circuit plate (or a short-circuit portion). On the other hand, a device such as a personal computer on which an antenna is installed is composed of a casing made of a metal such as magnesium. In the present invention, this casing is used as a ground plate electrically disconnected from the element, so that both the short-circuit plate and the ground plate connected to the short-circuit plate are omitted, and the antenna element is greatly reduced. This is because miniaturization can be realized.
In supplying power to the antenna, the inner conductor (5a) of the feeder line (5) such as a high-frequency coaxial cable is connected to the aforementioned feeding point (S1), while the outer conductor (5b) of the cable is connected to the ground plate (4). ) May be connected to the earth point (S2). As the high-frequency coaxial cable (5), a well-known high-frequency coaxial cable such as a fluororesin coating is employed. In order to connect the high-frequency coaxial cable (5) to the feeding point (S1) and the earth point (S2), soldering or ultrasonic connection may be used.
The above embodiment is an example in which the element (1) and the ground plate (4) are arranged in parallel on the same plane. However, the two do not necessarily have to be parallel to each other, and may be arranged at a desired angle, for example, a phase rotated by 90 degrees. In addition, various arrangement methods according to non-parallel spaces are employed.
There are various aspects of the element of the present invention. These will be described with reference to FIGS. 4, 6, 7 and 8. FIG.
The embodiment shown in FIG. 4 is provided with two closed slits, and the shape shown in FIG. In this case, the configuration is simplified compared to the flat plate element of FIG. However, since the current path of the high-frequency current decreases and the resonance point also decreases, as shown in FIG. 5, the range where the frequency characteristic (VSWR) is 2 or less is 3 GHz to 6 GHz, and the range where the bandwidth is slightly widened is narrow. Become.
Further, FIG. 6 shows a trapezoidal flat plate element, and FIG. 7 shows a so-called “rice” flat plate element in which the sun-shaped elements of FIG. 1 are arranged in two horizontal rows. Yes. In addition, in order to facilitate impedance adjustment, various modes such as a method in which a protruding narrow conductor is formed from a part of the element or a part of the element in the vicinity of the feeding point is formed in an arc shape are conceivable. .
Finally, the embodiment of FIG. 8 is configured in a three-dimensional shape by facing and connecting two of the above-described flat plate elements. With this configuration, impedance adjustment becomes easier. This is because in this case, by adjusting the facing distance (L6) between the two flat elements, the degree of freedom of impedance adjustment is increased as compared with the modes of FIGS.
Although FIG. 8 shows a mode in which two flat plate elements are opposed to each other, the three-dimensional shape is not limited to this, and there are various modes such as three or more or a block shape. is there.
以下に、図1に示したエレメントを含む、2.5GHz〜10.6GHzの広帯域を実現する情報端末機器内蔵用アンテナの具体例を示す。
先ず、縦7mm、横12mm、厚さ0.1mmの洋白からなる長方形の平板を放電加工機にて加工し、外形寸法が高さ(L2)が7mm、幅(L1)が12mmの、図1に示すエレメント(1)を得た。その際、3個の閉スリット(3)の夫々の長さ(L3)は10mm、閉スリットの幅(L4)は1mm、細幅状導体(2)の幅(L5)は1mmとした。
更に、給電点(S1)は、エレメント(1)の最下辺の細幅状導体部分の中央部、すなわち端面から6mmの位置に設けた。
以上により、高さ(L2)が7mm、幅(L1)が12mmという超小型エレメント(1)が完成した。
次に、上記にて作成したエレメント(1)を情報端末機器に内蔵させ、アンテナとして機能させるため、上記のエレメント(1)の給電点(S1)に外径0.93mm、導体径0.24mmのフッ素樹脂(PFA)高同軸ケーブル(5)の内部導体(5a)をハンダにより接続した。一方、グランド板(4)としてはエレメント(1)と同じ材質、厚さとし、縦、横ともに28mmとし、その上に設けられたアースポイント(S2)に、該ケーブル(5)の外部導体(5b)を接続して、情報端末機器内蔵用アンテナを得た。
最後に、このアンテナの周波数特性(VSWR)について試験したところ、図3に示す周波数特性が得られた。
この図からも明らかなように、本発明のアンテナにあっては、VSWRが2以下の範囲が2.5GHz〜10.6GHzと、広帯域に渡り共振しており、十分な帯域幅が確保されていることが分かる。
以上の例は、本発明の一例に過ぎず、本発明の思想の範囲内であれば、種種の変更および応用が可能であることは言うまでもない。
A specific example of an antenna for an information terminal device that realizes a wide band of 2.5 GHz to 10.6 GHz including the element shown in FIG. 1 will be shown below.
First, a rectangular flat plate of 7 mm in length, 12 mm in width, and 0.1 mm in thickness is processed with an electric discharge machine, and the outer dimensions are 7 mm in height (L2) and 12 mm in width (L1). Element (1) shown in 1 was obtained. At that time, the length (L3) of each of the three closed slits (3) was 10 mm, the width (L4) of the closed slit was 1 mm, and the width (L5) of the narrow conductor (2) was 1 mm.
Furthermore, the feeding point (S1) was provided at the center of the narrow conductor portion on the lowermost side of the element (1), that is, at a position 6 mm from the end face.
As described above, the microelement (1) having a height (L2) of 7 mm and a width (L1) of 12 mm was completed.
Next, in order to incorporate the element (1) created above into an information terminal device and function as an antenna, the feeding point (S1) of the element (1) has an outer diameter of 0.93 mm and a conductor diameter of 0.24 mm. The inner conductor (5a) of the fluororesin (PFA) high coaxial cable (5) was connected by solder. On the other hand, the ground plate (4) is made of the same material and thickness as the element (1) and has a length and width of 28 mm. The ground point (S2) provided on the ground plate (4) is connected to the outer conductor (5b) of the cable (5). ) To obtain an antenna for information terminal equipment.
Finally, when the frequency characteristic (VSWR) of this antenna was tested, the frequency characteristic shown in FIG. 3 was obtained.
As is apparent from this figure, in the antenna of the present invention, the range of VSWR of 2 or less is 2.5 GHz to 10.6 GHz, resonating over a wide band, and sufficient bandwidth is secured. I understand that.
The above examples are merely examples of the present invention, and it goes without saying that various modifications and applications are possible within the scope of the idea of the present invention.
本発明の広帯域エレメント、及び該エレメントを含む広帯域アンテナは、パソコンをはじめとしてPDA等の各種情報端末機器の他に、情報家電製品あるいは自動車関連機器へも内蔵できる。 The wideband element of the present invention and the wideband antenna including the element can be incorporated in information home appliances or automobile-related devices in addition to personal computers and various information terminal devices such as PDAs.
1 エレメント
2 細幅状導体
3 閉スリット
4 グランド板
5 高周波同軸ケーブル
5a 高周波同軸ケーブルの内部導体
5b 高周波同軸ケーブルの外部導体
L1 エレメントの長手方向の長さ
L2 エレメントの幅方向の長さ
L3 閉スリットの長さ
L4 閉スリットの幅
L5 細幅状導体の幅
L6 平板状エレメント間の対向距離
S1 給電点
S2
アースポイント
DESCRIPTION OF SYMBOLS 1 Element 2 Narrow conductor 3 Closed slit 4 Ground plate 5 High frequency coaxial cable 5a High frequency coaxial cable inner conductor 5b High frequency coaxial cable outer conductor L1 Element longitudinal length L2 Element width length L3 Closed slit Length L4 width of closed slit L5 width of narrow conductor L6 opposing distance S1 between flat elements S2 feeding point S2
Earth point
Claims (9)
a.該エレメントは細幅状導体によって取り囲まれたスリットの複数個を有すること;
b.該スリットには開放端がないこと;そして
c.該細幅状導体には単一の給電点が設けられていること。 A broadband element provided in an electrically unconnected state with a ground plate and having the following requirements a to c.
a. The element has a plurality of slits surrounded by a narrow conductor;
b. The slit has no open end; and c. The narrow conductor is provided with a single feeding point.
The broadband antenna according to claim 8, wherein the ground plate is a metal casing of an antenna installation device.
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JP2009284000A (en) * | 2008-05-19 | 2009-12-03 | Denso Corp | Antenna |
JP2010252175A (en) * | 2009-04-17 | 2010-11-04 | Mitsubishi Cable Ind Ltd | Wideband antenna |
US9808706B2 (en) | 2008-06-03 | 2017-11-07 | Tweedletech, Llc | Multi-dimensional game comprising interactive physical and virtual components |
US10456675B2 (en) | 2008-06-03 | 2019-10-29 | Tweedletech, Llc | Intelligent board game system with visual marker based game object tracking and identification |
US10790587B2 (en) | 2017-03-09 | 2020-09-29 | Fujitsu Limited | Multiband antenna and radio communication apparatus |
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JPS58215807A (en) * | 1982-06-10 | 1983-12-15 | Matsushita Electric Ind Co Ltd | Microstrip antenna |
JPH04122104A (en) * | 1990-09-13 | 1992-04-22 | Mitsubishi Electric Corp | Two-frequency shaped antenna |
JPH10200438A (en) * | 1997-01-10 | 1998-07-31 | Furukawa Electric Co Ltd:The | Portable radio equipment |
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Publication number | Priority date | Publication date | Assignee | Title |
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JP2009284000A (en) * | 2008-05-19 | 2009-12-03 | Denso Corp | Antenna |
US9808706B2 (en) | 2008-06-03 | 2017-11-07 | Tweedletech, Llc | Multi-dimensional game comprising interactive physical and virtual components |
US10155152B2 (en) | 2008-06-03 | 2018-12-18 | Tweedletech, Llc | Intelligent game system including intelligent foldable three-dimensional terrain |
US10456675B2 (en) | 2008-06-03 | 2019-10-29 | Tweedletech, Llc | Intelligent board game system with visual marker based game object tracking and identification |
JP2010252175A (en) * | 2009-04-17 | 2010-11-04 | Mitsubishi Cable Ind Ltd | Wideband antenna |
US10790587B2 (en) | 2017-03-09 | 2020-09-29 | Fujitsu Limited | Multiband antenna and radio communication apparatus |
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