JP2003174315A - Monopole antenna - Google Patents
Monopole antennaInfo
- Publication number
- JP2003174315A JP2003174315A JP2001371605A JP2001371605A JP2003174315A JP 2003174315 A JP2003174315 A JP 2003174315A JP 2001371605 A JP2001371605 A JP 2001371605A JP 2001371605 A JP2001371605 A JP 2001371605A JP 2003174315 A JP2003174315 A JP 2003174315A
- Authority
- JP
- Japan
- Prior art keywords
- capacitor
- monopole antenna
- radiation conductor
- ground
- ground electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、通信や放送の送受
信に用いられるモノポールアンテナに係り、特に、車載
用や携帯用として好適な小型のモノポールアンテナに関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monopole antenna used for communication and transmission / reception of broadcasting, and more particularly to a small monopole antenna suitable for mounting on a vehicle or for carrying.
【０００２】[0002]
【従来の技術】移動通信機器などにおいて、周波数帯域
が８００ＭＨｚ〜２ＧＨｚの電波の送受信に用いられる
モノポールアンテナとしては、金属板等からなる接地面
上に立設された全長がλ／４（ただし、λは電波の自由
空間波長）のロッド状の放射導体が広く採用されてい
る。かかるモノポールアンテナは、上下方向に延びる放
射導体の下端部に同軸ケ−ブル等の給電線が接続されて
おり、所望の周波数の電波と共振するように放射導体の
長さが設定されている。2. Description of the Related Art A monopole antenna used for transmitting and receiving radio waves having a frequency band of 800 MHz to 2 GHz in mobile communication devices has a total length of λ / 4 (provided that it is erected on a ground plane made of a metal plate or the like. , Λ are free space wavelengths of radio waves) rod-shaped radiation conductors are widely adopted. In such a monopole antenna, a feeder such as a coaxial cable is connected to the lower end of a radiation conductor extending in the vertical direction, and the length of the radiation conductor is set so as to resonate with a radio wave of a desired frequency. .
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上述し
た従来のモノポールアンテナは、共振周波数のリターン
ロスが大きい（つまり反射量が多い）という問題があっ
た。これは、モノポールアンテナを構成する放射導体の
インピーダンスのリアクタンス成分が共振周波数帯域に
おいて不所望に大きいからと考えられるので、反射特性
を向上させるためにはインピーダンスの調整が必要であ
るが、これまで、小型のモノポールアンテナにおいて放
射導体のインピーダンスを簡便に調整する技術は提案さ
れていなかった。また、この種のモノポールアンテナ
は、共振周波数帯域が狭くて特定の周波数付近の電波に
対してだけ共振するので、受信しようとする電波の周波
数にバラツキがある場合に、感度が極端に低下してしま
う恐れがあった。However, the above-mentioned conventional monopole antenna has a problem that the return loss of the resonance frequency is large (that is, the amount of reflection is large). This is thought to be because the reactance component of the impedance of the radiating conductor that constitutes the monopole antenna is undesirably large in the resonance frequency band, so it is necessary to adjust the impedance in order to improve the reflection characteristics. , A technique for easily adjusting the impedance of the radiation conductor in a small monopole antenna has not been proposed. In addition, this type of monopole antenna has a narrow resonance frequency band and resonates only with radio waves near a specific frequency, so if the frequency of the radio wave to be received varies, the sensitivity will drop extremely. There was a fear that
【０００４】本発明は、このような従来技術の実情に鑑
みてなされたもので、その目的は、反射特性を大幅に改
善でき共振周波数帯域も広いモノポールアンテナを提供
することにある。The present invention has been made in view of the circumstances of the prior art as described above, and an object thereof is to provide a monopole antenna which can greatly improve reflection characteristics and has a wide resonance frequency band.
【０００５】[0005]
【課題を解決するための手段】上述した目的を達成する
ために、本発明のモノポールアンテナでは、接地面上で
起立する誘電体基板と、この誘電体基板の表面に上下方
向に沿って設けられ下端部が給電線に接続された放射導
体と、この放射導体の誘導性リアクタンス成分を打ち消
すためのキャパシタとを備え、このキャパシタを前記放
射導体の給電点近傍と前記接地面との間に介設する構成
とした。In order to achieve the above-mentioned object, in a monopole antenna of the present invention, a dielectric substrate standing on a ground plane and a surface of the dielectric substrate are provided along a vertical direction. And a capacitor for canceling the inductive reactance component of the radiation conductor, and the capacitor is provided between the vicinity of the feeding point of the radiation conductor and the ground plane. It was configured to be installed.
【０００６】本発明者らの実験によると、モノポールア
ンテナの放射導体のインピーダンスは、共振周波数帯域
において誘導性リアクタンス成分が大きく残ってしまう
ことが判明したので、この誘導性リアクタンス成分を打
ち消すような容量性リアクタンス成分を付加することに
より、放射導体のリアクタンス成分をゼロに近付けるこ
とができる。すなわち、所定の静電容量に設定されてい
るコンデンサ等のキャパシタを放射導体の給電点近傍と
接地面との間に介設して、放射導体の誘導性リアクタン
ス成分を打ち消す構成とすることにより、共振周波数と
その近傍においてリターンロスを著しく低減させること
ができる。それゆえ、モノポールアンテナの反射特性を
大幅に向上させることができると共に、リターンロスの
値が許容値以下で所望の受信感度が期待できる範囲（共
振周波数帯域）を広げることができる。なお、このモノ
ポールアンテナは、放射導体が誘電体基板の表面に設け
てあるので、誘電体による波長短縮を考慮して放射導体
の長さを短く設定することができる。According to the experiments conducted by the present inventors, it has been found that the impedance of the radiation conductor of the monopole antenna has a large inductive reactance component remaining in the resonance frequency band. By adding the capacitive reactance component, the reactance component of the radiation conductor can be brought close to zero. That is, by disposing a capacitor such as a capacitor set to a predetermined capacitance between the vicinity of the feeding point of the radiation conductor and the ground plane, and by canceling the inductive reactance component of the radiation conductor, The return loss can be remarkably reduced at and near the resonance frequency. Therefore, the reflection characteristics of the monopole antenna can be significantly improved, and the range (resonance frequency band) in which the desired reception sensitivity can be expected when the value of the return loss is equal to or less than the allowable value can be widened. In this monopole antenna, since the radiation conductor is provided on the surface of the dielectric substrate, the length of the radiation conductor can be set to be short in consideration of the wavelength shortening due to the dielectric.
【０００７】また、上述したモノポールアンテナが、誘
電体基板の下端部に接地電極部を設け、この接地電極部
を接地面に半田付けする構成にしてあれば、組立作業性
が良好となり信頼性も向上するので好ましい。その際、
キャパシタとして、一端側が放射導体の給電点近傍に接
続されて他端側が接地電極部に接続されたチップコンデ
ンサを用いれば、構成を複雑化することなく簡単かつ安
価にインピーダンス調整が行える。ただし、このような
チップコンデンサを用いない構成も可能であり、例え
ば、放射導体の下端部に給電点から側方へ延びて接地電
極部と対向するアース対向部を延設し、このアース対向
部と接地電極部との間に画成される空隙をインピーダン
ス調整用のキャパシタとなしてもよい。Further, in the above-mentioned monopole antenna, if the ground electrode portion is provided at the lower end portion of the dielectric substrate and the ground electrode portion is soldered to the ground surface, the assembling workability is improved and the reliability is improved. It is also preferable because it also improves. that time,
If a chip capacitor whose one end side is connected to the vicinity of the feeding point of the radiation conductor and the other end side is connected to the ground electrode portion is used as the capacitor, impedance adjustment can be performed easily and inexpensively without complicating the configuration. However, a configuration without such a chip capacitor is also possible. For example, a ground facing portion that extends laterally from the feeding point and faces the ground electrode portion is provided at the lower end portion of the radiation conductor, and this ground facing portion is provided. The gap defined between the ground electrode part and the ground electrode part may be a capacitor for impedance adjustment.
【０００８】[0008]
【発明の実施の形態】以下、発明の実施の形態について
図面を参照して説明すると、図１は実施形態例に係るモ
ノポールアンテナの正面図、図２は該モノポールアンテ
ナの反射特性を示す説明図である。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a monopole antenna according to an embodiment, and FIG. 2 shows reflection characteristics of the monopole antenna. FIG.
【０００９】図１に示すように、本実施形態例に係るモ
ノポールアンテナは、接地面１上で起立する誘電体基板
２と、この誘電体基板２の表面に上下方向に沿って設け
られた放射導体３と、誘電体基板２の下端部に設けられ
た接地電極部４と、これら放射導体３と接地電極部４と
の間に介在させたチップコンデンサ５とによって概略構
成されている。接地電極部４は金属板等からなる接地面
１に半田付けされており、この接地電極部４に接続され
た入力電源６から同軸ケ−ブル等の給電線７を介して、
放射導体３に高周波信号が給電されるようになってい
る。また、キャパシタとしてのチップコンデンサ５は、
その一端側が放射導体３の給電点近傍に接続され、かつ
他端側が接地電極部４に接続されている。なお、本実施
形態例では、誘電体基板２としてＦＲ−４などの安価で
比誘電率がやや高い材料を使用し、この誘電体基板２の
表面に設けた銅箔をエッチングして放射導体３および接
地電極部４をパターン形成しているが、放射導体３およ
び接地電極部４を印刷によって形成することも可能であ
る。As shown in FIG. 1, the monopole antenna according to the present embodiment is provided with a dielectric substrate 2 standing upright on a ground plane 1 and on the surface of the dielectric substrate 2 in the vertical direction. The radiation conductor 3, a ground electrode portion 4 provided at the lower end of the dielectric substrate 2, and a chip capacitor 5 interposed between the radiation conductor 3 and the ground electrode portion 4 are roughly configured. The ground electrode portion 4 is soldered to the ground surface 1 made of a metal plate or the like, and the input power source 6 connected to the ground electrode portion 4 is connected via a feeder line 7 such as a coaxial cable.
A high frequency signal is supplied to the radiation conductor 3. Also, the chip capacitor 5 as a capacitor is
One end side thereof is connected to the vicinity of the feeding point of the radiation conductor 3 and the other end side thereof is connected to the ground electrode portion 4. In the present embodiment, a material such as FR-4 that is inexpensive and has a slightly high relative dielectric constant is used as the dielectric substrate 2, and the copper foil provided on the surface of the dielectric substrate 2 is etched to radiate the conductor 3. Although the ground electrode portion 4 is patterned, the radiation conductor 3 and the ground electrode portion 4 may be formed by printing.
【００１０】上述したモノポールアンテナにおいて、チ
ップコンデンサ５は放射導体３の誘導性リアクタンス成
分を打ち消すために付加されている。すなわち、仮にチ
ップコンデンサ５が付加されていないとすると、図２の
２点鎖線で示すように、このモノポールアンテナのリタ
ーンロスは、所要周波数帯域において−１０ｄＢよりも
大きくなってしまい、感度良好とは言い難くなる。その
理由について本発明者らが種々考察した結果、放射導体
３のインピーダンスは、所要周波数帯域において誘導性
リアクタンス成分が大きく残ってしまうためであること
が判明した。例えば、比較例として示す図２の２点鎖線
中において、共振周波数ｆ０でのリアクタンス成分は誘
導性でｊ４４．５Ωもある（純抵抗は４４．４Ω）。し
たがって、反射特性を改善するためには、この誘導性リ
アクタンス成分を打ち消すような容量性リアクタンス成
分を付加し、放射導体３のリアクタンス成分をゼロに近
付ければよいことになる。本実施形態例では、この誘導
性リアクタンス成分を打ち消す所定の静電容量に設定さ
れたチップコンデンサ５を付加しているので、図２の実
線で示すように、所要周波数帯域においてリターンロス
が著しく低減しており、例えば共振周波数ｆ０のときの
リターンロスは約−２５ｄＢとなっている。ちなみに、
図２の実線中において、共振周波数ｆ０でのリアクタン
ス成分は誘導性でｊ２．８Ωと極めて小さくなってい
る。In the above monopole antenna, the chip capacitor 5 is added to cancel the inductive reactance component of the radiation conductor 3. That is, if the chip capacitor 5 is not added, the return loss of this monopole antenna becomes larger than -10 dB in the required frequency band, as shown by the chain double-dashed line in FIG. Is hard to say. As a result of various studies made by the present inventors on the reason, it has been found that the impedance of the radiation conductor 3 is because a large inductive reactance component remains in the required frequency band. For example, in the two-dot chain line of FIG. 2 shown as a comparative example, the reactance component at the resonance frequency f 0 is inductive and has j44.5Ω (the pure resistance is 44.4Ω). Therefore, in order to improve the reflection characteristic, it is only necessary to add a capacitive reactance component that cancels the inductive reactance component and bring the reactance component of the radiation conductor 3 close to zero. In the present embodiment, since the chip capacitor 5 set to a predetermined electrostatic capacity for canceling out the inductive reactance component is added, the return loss is significantly reduced in the required frequency band as shown by the solid line in FIG. For example, the return loss at the resonance frequency f 0 is about −25 dB. By the way,
In the solid line of FIG. 2, the reactance component at the resonance frequency f 0 is inductive and is extremely small at j2.8Ω.
【００１１】このように、放射導体３の給電点近傍と接
地電極部４との間にチップコンデンサ５を介設し、放射
導体３の誘導性リアクタンス成分を打ち消す構成にして
あれば、共振周波数とその近傍においてリターンロスが
著しく低減するので、モノポールアンテナの反射特性を
大幅に向上させることができる。しかも、チップコンデ
ンサ５を付加するだけなので、構成を複雑化することな
く簡単かつ安価にインピーダンス調整を行うことができ
る。また図２の実線で示すように、本実施形態例では、
リターンロスの値が許容値（例えば−８ｄＢ）以下で所
望の受信感度を期待できる範囲（所要周波数帯域）が広
くなっているので、受信しようとする電波の周波数に多
少のバラツキがあったしても、良好な感度を期待するこ
とができる。なお、本実施形態例のように、放射導体３
を誘電体基板２の表面に設けたモノポールアンテナで
は、誘電体による波長短縮を考慮して放射導体３の長さ
を設定することになるので、全体の高さ寸法を短縮でき
るという利点もある。また、このモノポールアンテナは
接地電極部４を接地面１に半田付けするというものなの
で、組立時にねじ止め等の煩雑な作業を行う必要がな
い。As described above, if the chip capacitor 5 is provided between the feeding point of the radiation conductor 3 and the ground electrode portion 4 to cancel the inductive reactance component of the radiation conductor 3, the resonance frequency is Since the return loss is significantly reduced in the vicinity thereof, the reflection characteristics of the monopole antenna can be greatly improved. Moreover, since only the chip capacitor 5 is added, impedance adjustment can be performed easily and inexpensively without complicating the configuration. Further, as shown by the solid line in FIG. 2, in the present embodiment example,
Since the range (required frequency band) where the desired reception sensitivity can be expected is wide when the value of the return loss is equal to or less than the allowable value (for example, -8 dB), there is some variation in the frequency of the radio wave to be received. Also, good sensitivity can be expected. In addition, as in the present embodiment, the radiation conductor 3
In the monopole antenna provided on the surface of the dielectric substrate 2, the length of the radiating conductor 3 is set in consideration of the shortening of the wavelength by the dielectric, so that there is an advantage that the overall height dimension can be shortened. . Further, since this monopole antenna is one in which the ground electrode portion 4 is soldered to the ground surface 1, it is not necessary to perform complicated work such as screwing at the time of assembly.
【００１２】図３は他の実施形態例に係るモノポールア
ンテナの正面図で、図１に対応する部分には同一符号を
付してある。FIG. 3 is a front view of a monopole antenna according to another embodiment, in which parts corresponding to those in FIG. 1 are designated by the same reference numerals.
【００１３】図３に示すように、本実施形態例に係るモ
ノポールアンテナは、放射導体３の下端部に給電点から
側方へ延びて接地電極部４と対向するアース対向部３ａ
を延設し、このアース対向部３ａと接地電極部４との間
に画成される空隙Ｇをインピーダンス調整用のキャパシ
タとして利用するというものである。このような構成を
採用すれば、インピーダンス調整用のチップコンデンサ
を省略できるので、部品点数を削減できて組立作業性も
向上するという利点がある。As shown in FIG. 3, the monopole antenna according to the present embodiment has a ground facing portion 3a which extends laterally from the feeding point to the lower end portion of the radiation conductor 3 and faces the ground electrode portion 4a.
Is extended and the gap G defined between the ground facing portion 3a and the ground electrode portion 4 is used as a capacitor for impedance adjustment. If such a configuration is adopted, the chip capacitor for impedance adjustment can be omitted, so that there is an advantage that the number of parts can be reduced and the assembling workability is improved.
【００１４】図４はさらに他の実施形態例に係るモノポ
ールアンテナの正面図で、図１，３に対応する部分には
同一符号を付してある。FIG. 4 is a front view of a monopole antenna according to still another embodiment, in which parts corresponding to those in FIGS. 1 and 3 are designated by the same reference numerals.
【００１５】図４に示すように、本実施形態例に係るモ
ノポールアンテナでは、放射導体３に蛇行帯状部３ｂを
設けることによって、その高さを変えずに長さを延ばし
ているの。したがって、このような構成を採用すれば、
より波長の長い電波と共振することになって共振周波数
の低下が図られ、しかも、放射導体３のうち電圧が大き
く変化する上部側（容量領域）に蛇行帯状部３ｂよりも
幅広な幅広部３ｃが設けてあるので、共振周波数は一層
低下することになり、所望の周波数に共振させるうえで
必要となる放射導体３の高さ寸法を大幅に低減できると
いう利点がある。As shown in FIG. 4, in the monopole antenna according to the present embodiment, the radiating conductor 3 is provided with the meandering band portion 3b, so that its length is extended without changing its height. Therefore, if such a configuration is adopted,
The resonance frequency is reduced by resonating with a radio wave having a longer wavelength, and the wide portion 3c wider than the meandering strip portion 3b is provided on the upper side (capacitance region) of the radiation conductor 3 where the voltage greatly changes. Since the resonance frequency is further reduced, there is an advantage that the height dimension of the radiation conductor 3 required to resonate at a desired frequency can be significantly reduced.
【００１６】[0016]
【発明の効果】本発明は、以上説明したような形態で実
施され、以下に記載されるような効果を奏する。The present invention is carried out in the form as described above, and has the following effects.
【００１７】チップコンデンサ等のキャパシタを放射導
体の給電点近傍と接地面との間に介設して、放射導体の
誘導性リアクタンス成分を打ち消す構成にしてあるの
で、共振周波数とその近傍でリターンロスを著しく低減
させることができる。それゆえ、反射特性を大幅に改善
できて動作周波数帯域も広い優れたモノポールアンテナ
を提供することができる。Since a capacitor such as a chip capacitor is interposed between the vicinity of the feeding point of the radiation conductor and the ground plane to cancel the inductive reactance component of the radiation conductor, the return loss is at the resonance frequency and its vicinity. Can be significantly reduced. Therefore, it is possible to provide an excellent monopole antenna whose reflection characteristics can be greatly improved and the operating frequency band is wide.
【図１】本発明の実施形態例に係るモノポールアンテナ
の正面図である。FIG. 1 is a front view of a monopole antenna according to an exemplary embodiment of the present invention.
【図２】図１に示すモノポールアンテナの反射特性を示
す説明図である。FIG. 2 is an explanatory diagram showing reflection characteristics of the monopole antenna shown in FIG.
【図３】本発明の他の実施形態例に係るモノポールアン
テナの正面図である。FIG. 3 is a front view of a monopole antenna according to another embodiment of the present invention.
【図４】本発明のさらに他の実施形態例に係るモノポー
ルアンテナの正面図である。FIG. 4 is a front view of a monopole antenna according to another embodiment of the present invention.
１ 接地面 ２ 誘電体基板 ３ 放射導体 ３ａ アース対向部 ４ 接地電極部 ５ チップコンデンサ（キャパシタ） ６ 入力電源 ７ 給電線 Ｇ 空隙（キャパシタ） 1 ground plane 2 Dielectric substrate 3 radiation conductor 3a Earth facing part 4 Ground electrode part 5 Chip capacitors 6 Input power 7 power lines G air gap (capacitor)
Claims (4)
誘電体基板の表面に上下方向に沿って設けられ下端部が
給電線に接続された放射導体と、この放射導体の誘導性
リアクタンス成分を打ち消すためのキャパシタとを備
え、このキャパシタを前記放射導体の給電点近傍と前記
接地面との間に介設したことを特徴とするモノポールア
ンテナ。1. A dielectric substrate standing upright on a ground plane, a radiation conductor provided on the surface of the dielectric substrate along the vertical direction and having a lower end connected to a power supply line, and an inductive reactance of the radiation conductor. A monopole antenna comprising a capacitor for canceling a component, the capacitor being interposed between the vicinity of a feeding point of the radiation conductor and the ground plane.
板の下端部に接地電極部を設け、この接地電極部を前記
接地面に半田付けしたことを特徴とするモノポールアン
テナ。2. The monopole antenna according to claim 1, wherein a ground electrode portion is provided at a lower end portion of the dielectric substrate, and the ground electrode portion is soldered to the ground surface.
タとして、一端側が前記放射導体の給電点近傍に接続さ
れ、他端側が前記接地電極部に接続されたチップコンデ
ンサを用いたことを特徴とするモノポールアンテナ。3. The chip capacitor according to claim 2, wherein the capacitor is a chip capacitor whose one end side is connected to the vicinity of a feeding point of the radiation conductor and the other end side is connected to the ground electrode portion. Monopole antenna.
の下端部に給電点から側方へ延びて前記接地電極部と対
向するアース対向部を延設し、このアース対向部と前記
接地電極部との間に画成される空隙を前記キャパシタと
なしたことを特徴とするモノポールアンテナ。4. The ground facing part according to claim 2, wherein a ground facing part extending laterally from the feeding point and facing the ground electrode part is provided at a lower end part of the radiation conductor, and the ground facing part and the ground electrode are provided. A monopole antenna, characterized in that a gap defined between the capacitor and the portion is formed as the capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001371605A JP2003174315A (en) | 2001-12-05 | 2001-12-05 | Monopole antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001371605A JP2003174315A (en) | 2001-12-05 | 2001-12-05 | Monopole antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003174315A true JP2003174315A (en) | 2003-06-20 |
Family
ID=19180626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001371605A Pending JP2003174315A (en) | 2001-12-05 | 2001-12-05 | Monopole antenna |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003174315A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004363675A (en) * | 2003-04-10 | 2004-12-24 | Matsushita Electric Ind Co Ltd | Antenna element and antenna module |
| US7123207B2 (en) | 2003-09-09 | 2006-10-17 | National Institute Of Information And Communications Technology | Ultra wideband bow-tie printed antenna |
| US7193576B2 (en) | 2004-02-19 | 2007-03-20 | National Institute Of Information And Communications Technology | Ultra wideband bow-tie slot antenna |
| JP2010278739A (en) * | 2009-05-28 | 2010-12-09 | Nippon Soken Inc | In-vehicle antenna device |
| KR101012263B1 (en) * | 2008-11-04 | 2011-02-07 | 주식회사 이엠따블유 | Built-in antenna for controlling resonant frequency |
| JP2013544513A (en) * | 2010-11-08 | 2013-12-19 | パンデブ ホールディングス プチ リミテッド | Watering system |
| CN103794853A (en) * | 2013-03-28 | 2014-05-14 | 深圳光启创新技术有限公司 | Omnidirectional antenna |
| CN103794883A (en) * | 2013-03-28 | 2014-05-14 | 深圳光启创新技术有限公司 | Directional antenna |
| JP2015053548A (en) * | 2013-09-05 | 2015-03-19 | 富士通株式会社 | Antenna device |
| JP2015231186A (en) * | 2014-06-06 | 2015-12-21 | 国立研究開発法人情報通信研究機構 | Broadband antenna |
-
2001
- 2001-12-05 JP JP2001371605A patent/JP2003174315A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004363675A (en) * | 2003-04-10 | 2004-12-24 | Matsushita Electric Ind Co Ltd | Antenna element and antenna module |
| US7123207B2 (en) | 2003-09-09 | 2006-10-17 | National Institute Of Information And Communications Technology | Ultra wideband bow-tie printed antenna |
| US7193576B2 (en) | 2004-02-19 | 2007-03-20 | National Institute Of Information And Communications Technology | Ultra wideband bow-tie slot antenna |
| KR101012263B1 (en) * | 2008-11-04 | 2011-02-07 | 주식회사 이엠따블유 | Built-in antenna for controlling resonant frequency |
| JP2010278739A (en) * | 2009-05-28 | 2010-12-09 | Nippon Soken Inc | In-vehicle antenna device |
| JP2013544513A (en) * | 2010-11-08 | 2013-12-19 | パンデブ ホールディングス プチ リミテッド | Watering system |
| CN103794853A (en) * | 2013-03-28 | 2014-05-14 | 深圳光启创新技术有限公司 | Omnidirectional antenna |
| CN103794883A (en) * | 2013-03-28 | 2014-05-14 | 深圳光启创新技术有限公司 | Directional antenna |
| CN103794883B (en) * | 2013-03-28 | 2015-04-15 | 深圳光启创新技术有限公司 | Directional antenna |
| JP2015053548A (en) * | 2013-09-05 | 2015-03-19 | 富士通株式会社 | Antenna device |
| JP2015231186A (en) * | 2014-06-06 | 2015-12-21 | 国立研究開発法人情報通信研究機構 | Broadband antenna |
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