JP4147210B2 - Yagi / Uda antenna system - Google Patents

Yagi / Uda antenna system Download PDF

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JP4147210B2
JP4147210B2 JP2004223696A JP2004223696A JP4147210B2 JP 4147210 B2 JP4147210 B2 JP 4147210B2 JP 2004223696 A JP2004223696 A JP 2004223696A JP 2004223696 A JP2004223696 A JP 2004223696A JP 4147210 B2 JP4147210 B2 JP 4147210B2
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孝 端山
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Maspro Denkoh Corp
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Description

本発明は，八木・宇田式アンテナ装置に関する。
The present invention relates to a Yagi / Uda antenna device.

従来，八木・宇田式アンテナ装置は放射器，導波器および反射器が備えられており，放射器，導波器，反射器は受信周波数および受信周波数帯域幅に応じて，それぞれ寸法が決定される。一般に高利得と所定の帯域幅を得るために同一寸法の導波器が複数本用いられる。（例えば，特許文献１参照）。
Conventionally, Yagi-Uda type antenna devices have been equipped with radiators, directors and reflectors, and the dimensions of the radiators, directors and reflectors are determined according to the reception frequency and the reception frequency bandwidth. The In general, a plurality of waveguides having the same size are used in order to obtain a high gain and a predetermined bandwidth. (For example, refer to Patent Document 1).

また，ＵＨＦ用アンテナはローバンド用（ｃｈ１３−４４），ハイバンド用（ｃｈ３０−６２），オールバンド用（ｃｈ１３−６２）というように，それぞれの受信帯域において最大の受信動作利得を得られるように設計されている。（例えば，非特許文献１参照）。
In addition, UHF antennas such as low band (ch13-44), high band (ch30-62), and allband (ch13-62) can obtain the maximum reception operation gain in each reception band. Designed. (For example, refer nonpatent literature 1).

実開昭５９−１６４３０５号公報Japanese Utility Model Publication No.59-164305 マスプロ電工株式会社発行，ゼネラルカタログ２００２．３，Ｐ．４３−５６Published by Maspro Electric Co., Ltd., General Catalog 2002.3, p. 43-56

しかし，上記特許文献１提案の技術では所定の帯域幅で均一な受信感度を得られるものの，所定の高感度を得るためには導波器の数を増やす必要があり，アンテナ装置が大型化するという問題があった。また，アンテナの大型化に伴い，美観も問題になっている。
However, although the technique proposed in Patent Document 1 can obtain a uniform reception sensitivity with a predetermined bandwidth, it is necessary to increase the number of directors in order to obtain a predetermined high sensitivity, and the antenna device becomes larger. There was a problem. In addition, with the increase in size of antennas, aesthetics have become a problem.

また，上記非特許文献１提案の技術では，新たに地上波ディジタル放送が開始されると，受信アンテナを追加・交換しなければならないという問題があった。なぜなら，地上波ディジタル放送は３大都市圏でサービスが開始されたが，地上波ディジタル放送はＵＨＦ帯で放送され，しかもその大半はＣｈ１３〜Ｃｈ３２の低い周波数帯に集中していることから，ローバンド用のアンテナを使用している場合は問題ないが，ローバンド以外のアンテナを使用している場合は，この帯域が受信できるアンテナを追加するか，または交換する必要がある。また，地上波ディジタル放送開始時には既存の地上波アナログ放送に対する妨害を考慮して，定常時出力の１００分の１程度の低い送信電力で送信されている。このため，地上波ディジタル放送を安定受信するためにはアンテナの動作利得が重要になってくる。したがって，地上ディジタル放送の周波数帯域の動作利得が高いアンテナに交換しなければならないのである。
また，従来，アンテナを選択する場合，将来放送局が追加される可能性を見込んで，全帯域（オールバンド）用のアンテナが選択されることが多かった。ところが，オールバンドのアンテナを使用している場合，受信帯域は合致するものの，広帯域であるために動作利得が低く，所要の受信レベルを得るためには素子数（特に導波器の数）の多い高利得なアンテナに交換しなければならず，アンテナが大型化してしまうという問題があった。
Further, the technique proposed in Non-Patent Document 1 has a problem that when a digital terrestrial broadcast is newly started, a receiving antenna must be added or replaced. This is because terrestrial digital broadcasting has been started in the three major metropolitan areas, but terrestrial digital broadcasting is broadcast in the UHF band, and most of it is concentrated in the low frequency band of Ch13 to Ch32. There is no problem if an antenna is used, but if an antenna other than the low band is used, it is necessary to add or replace an antenna capable of receiving this band. At the start of digital terrestrial broadcasting, transmission is performed with a transmission power as low as about 1/100 of the steady-state output in consideration of interference with existing terrestrial analog broadcasting. For this reason, the operational gain of the antenna becomes important in order to stably receive terrestrial digital broadcasting. Therefore, it is necessary to replace the antenna with a high operating gain in the frequency band of terrestrial digital broadcasting.
Conventionally, when an antenna is selected, an antenna for the entire band (all bands) is often selected in anticipation of the possibility of adding a broadcasting station in the future. However, when an all-band antenna is used, the reception band is matched, but the operation gain is low because of the wide band, and the number of elements (especially the number of waveguides) is required to obtain the required reception level. There was a problem that the antenna would become large because it had to be replaced with many high gain antennas.

そこで本願においては，こうした問題点を解決するためになされたものであり，その目的は，小型なアンテナであっても，第１の所定帯域の受信感度が高くかつ，第２の所定帯域の受信感度が所定値以上得られる八木・宇田式アンテナ装置を提供することである。
他の目的は共通部品が使用でき，製造コストの低減が図れる八木・宇田式アンテナ装置を提供することである。
他の目的は３大都市圏で放送される地上ディジタル放送信号および，地上アナログ放送信号を効率よく受信できる八木・宇田式アンテナ装置を提供することである。
In view of this, the present application has been made to solve such problems. The purpose of this application is to achieve high reception sensitivity in the first predetermined band and reception of the second predetermined band even with a small antenna. It is to provide a Yagi / Uda type antenna device that can obtain a sensitivity of a predetermined value or more.
Another object is to provide a Yagi-Uda type antenna device that can use common parts and reduce manufacturing costs.
Another object is to provide a Yagi-Uda type antenna device that can efficiently receive digital terrestrial broadcast signals and analog terrestrial broadcast signals broadcast in three metropolitan areas.

上記課題を解決するために，請求項１の発明は，放射器と反射器と導波器を備えた八木・宇田式アンテナ装置において，同じ長さの複数の導波器を１組とし，長さの異なる複数組の導波器を備えると共に，前記導波器の長さが前記放射器側ほど長くなるように設定するように構成される。
In order to solve the above-mentioned problems, the invention of claim 1 is a Yagi-Uda type antenna device comprising a radiator, a reflector and a director. A plurality of sets of different directors are provided, and the length of the director is set to be longer toward the radiator side.

請求項２の発明は，請求項１に記載の八木・宇田式アンテナ装置において，前記導波器は２組からなり，各組を構成する導波素子の数が略等しい数に設定するように構成される。
According to a second aspect of the present invention, in the Yagi-Uda type antenna device according to the first aspect, the waveguide is composed of two sets, and the number of waveguide elements constituting each set is set to be approximately equal. Composed.

請求項３の発明は，請求項２に記載の八木・宇田式アンテナ装置において，前記２組の導波器は各導波素子の長さが略２１０ｍｍと略２２０ｍｍに設定するように構成される。
According to a third aspect of the present invention, in the Yagi-Uda type antenna device according to the second aspect, the two sets of waveguides are configured such that the length of each waveguide element is set to approximately 210 mm and approximately 220 mm. .

請求項１の発明によれば，放射器と反射器と導波器を備えた八木・宇田式アンテナ装置において，同じ長さの複数の導波器を１組とし，長さの異なる複数組の導波器を備えると共に，前記導波器の長さが前記放射器側ほど長くなるように設定するように構成したので，
小型なアンテナであっても，第１の所定帯域の受信感度が高くかつ，第２の所定帯域の受信感度が所定値以上得られる八木・宇田式アンテナ装置を提供することができる。
According to the invention of claim 1, in the Yagi-Uda type antenna device provided with a radiator, a reflector, and a director, a plurality of waveguides having the same length are set as one set, and a plurality of sets having different lengths are set. Since it is configured to have a director and the length of the director is set to be longer toward the radiator side,
Even with a small antenna, it is possible to provide a Yagi-Uda type antenna device that has a high reception sensitivity in the first predetermined band and a reception sensitivity in the second predetermined band that is equal to or higher than a predetermined value.

請求項２の発明によれば，請求項１に記載の八木・宇田式アンテナ装置において，前記導波器は２組からなり，各組を構成する導波素子の数が略等しい数に設定するように構成したので，
共通部品が使用でき，製造コストの低減が図れる八木・宇田式アンテナ装置を提供することができる。
According to a second aspect of the present invention, in the Yagi-Uda type antenna device according to the first aspect, the waveguide is composed of two sets, and the number of waveguide elements constituting each set is set to be approximately equal. Because it was configured as
It is possible to provide a Yagi / Uda type antenna device that can use common parts and reduce the manufacturing cost.

請求項３の発明によれば，請求項２に記載の八木・宇田式アンテナ装置において，前記２組の導波器は各導波素子の長さが略２１０ｍｍと略２２０ｍｍに設定するように構成したので，
３大都市圏で放送される地上ディジタル放送信号および，地上アナログ放送信号を効率よく受信できる八木・宇田式アンテナ装置を提供することができる。
According to a third aspect of the present invention, in the Yagi-Uda type antenna device according to the second aspect, the two sets of waveguides are configured such that the length of each waveguide element is set to approximately 210 mm and approximately 220 mm. So
It is possible to provide a Yagi / Uda type antenna device that can efficiently receive digital terrestrial broadcast signals and analog terrestrial broadcast signals broadcast in three major metropolitan areas.

以下に，本発明を具体化した実施形態の例を，図面を基に詳細に説明する。
Hereinafter, an example of an embodiment embodying the present invention will be described in detail with reference to the drawings.

図１は本発明を適用した八木・宇田式アンテナ装置の説明図を示しており，図１（ａ）は正面図，図１（ｂ）は側面図である。
１は八木・宇田式アンテナ装置であり，反射器４，放射器３，導波器２がそれぞれ所定の間隔でブーム６に固定されている。また，ブーム６には八木・宇田式アンテナ装置１をマスト等に固定するためのアンテナ支持金具５が備えられている。７は給電部，２０・２１は導波素子である。
1A and 1B are explanatory views of a Yagi-Uda antenna device to which the present invention is applied. FIG. 1A is a front view and FIG. 1B is a side view.
Reference numeral 1 denotes a Yagi / Uda type antenna device, in which a reflector 4, a radiator 3 and a director 2 are fixed to a boom 6 at predetermined intervals. Also, the boom 6 is provided with an antenna support bracket 5 for fixing the Yagi / Uda type antenna device 1 to a mast or the like. Reference numeral 7 denotes a feeding portion, and 20 and 21 are waveguide elements.

導波器２は複数組の導波器２Ａ，２Ｂで構成されている。そして，導波器２Ａ，２Ｂはそれぞれ長さの異なる導波素子２０，２１が複数本所定の間隔になるようにブーム６上に配置してある。
導波器の長さは後述する放射器の長さより短くなるように形成されており，放射器側の長さが長くなるように配置してある。
The director 2 includes a plurality of sets of directors 2A and 2B. The waveguides 2A and 2B are arranged on the boom 6 so that a plurality of waveguide elements 20 and 21 having different lengths are arranged at a predetermined interval.
The length of the director is formed so as to be shorter than the length of the radiator described later, and the length on the radiator side is increased.

本実施例では，導波素子２０，２１をそれぞれ６本使用したが，これに限定されることはなく，所定の利得が得られるように各本数を適宜決定すればよい。
In this embodiment, six waveguide elements 20 and 21 are used. However, the number of the waveguide elements 20 and 21 is not limited to this.

また，導波器２（詳しくは導波素子２０，２１）をブーム６に固定する手段としては，周知のネジ締めや，カシメによる固定方法を採用すればよい。また，導波素子の素材としては直径８ｍｍ，肉厚０．５ｍｍ程度のアルミパイプが好適に使用されるが，例えば，合成樹脂材料の表面に導電性材料をメッキまたは蒸着して使用しても良い。
Further, as means for fixing the waveguide 2 (specifically, the waveguide elements 20 and 21) to the boom 6, a well-known screw tightening or caulking fixing method may be employed. As the material of the waveguide element, an aluminum pipe having a diameter of about 8 mm and a thickness of about 0.5 mm is preferably used. For example, a conductive material may be plated or evaporated on the surface of a synthetic resin material. good.

放射器３は図１に示すように，給電部７を備えており，同軸ケーブル（図示せず）が接続されている。放射器３はビームダイポールアンテナとして形成され放射器のみで単一指向特性を有するようになっている。そして，その長さは受信する電波の波長の約２分の１に設定してある。なお，給電部７は合成樹脂材料で形成されたケース内に整合回路が備えられており，前記半波長ダイポールアンテナで受信した受信信号を効率よく伝送線である同軸ケーブルに供給している。
また，給電部７はブーム６への固定部材としても機能しており，周知の固定手段でもって，ブーム６に固定されている。
As shown in FIG. 1, the radiator 3 includes a power feeding unit 7 and is connected to a coaxial cable (not shown). The radiator 3 is formed as a beam dipole antenna and has a unidirectional characteristic only by the radiator. The length is set to about one half of the wavelength of the received radio wave. The power feeding unit 7 is provided with a matching circuit in a case formed of a synthetic resin material, and efficiently supplies a received signal received by the half-wave dipole antenna to a coaxial cable as a transmission line.
The power feeding unit 7 also functions as a fixing member to the boom 6 and is fixed to the boom 6 by a known fixing means.

反射器４は，ブームの端部に周知の固定手段でもって固定されている。また，反射器の長さは，前記放射器の長さより長くなるように設定されている。
また，放射器３，反射器４の素材としては，導波素子の素材と同様に直径８ｍｍ，肉厚０．５ｍｍ程度のアルミパイプが好適に使用されるが，例えば，合成樹脂材料の表面に導電性材料をメッキまたは蒸着して使用しても良い。
The reflector 4 is fixed to the end of the boom by a known fixing means. The length of the reflector is set to be longer than the length of the radiator.
As the material for the radiator 3 and the reflector 4, an aluminum pipe having a diameter of about 8 mm and a thickness of about 0.5 mm is preferably used as in the waveguide element material. A conductive material may be used by plating or vapor deposition.

次に，図1に示した八木・宇田式アンテナ装置１の導波器２，放射器３および反射器４の具体的な寸法と周波数特性について図２，図３を用いて説明する。
放射器３の第１エレメントの長さＬ３１は２５０ｍｍで，受信帯域の略中心周波数６００ＭＨｚにおける波長の２分の１に設定してある。第２エレメントの長さＬ３２は前記第１エレメントの長さＬ３１よりも長い値である３８０ｍｍに設定してある。
Next, specific dimensions and frequency characteristics of the director 2, the radiator 3 and the reflector 4 of the Yagi / Uda antenna apparatus 1 shown in FIG. 1 will be described with reference to FIGS.
The length L31 of the first element of the radiator 3 is 250 mm, and is set to one half of the wavelength at the approximate center frequency 600 MHz of the reception band. The length L32 of the second element is set to 380 mm, which is a value longer than the length L31 of the first element.

次に，第１組の導波器２Ａの長さＬ２０は２１０ｍｍ，第２組の導波器２Ｂの長さＬ２１は２２０ｍｍであり，前記放射器３のエレメントの長さよりも短い値に設定してある。
尚，本実施例ではＬ２０＝２１０ｍｍ，Ｌ２１＝２２０ｍｍに設定したが，この値に限定されるものではなく，それぞれプラス１０％・マイナス１０％の範囲内であれば同様の効果が得られる。
Next, the length L20 of the first set of waveguides 2A is 210 mm, the length L21 of the second set of waveguides 2B is 220 mm, and is set to a value shorter than the length of the elements of the radiator 3. It is.
In this embodiment, L20 = 210 mm and L21 = 220 mm are set. However, the present invention is not limited to these values, and the same effect can be obtained as long as it is within the range of plus 10% and minus 10%.

次に，反射器４の長さＬ４は３１０ｍｍであり，前記放射器３のエレメントの長さよりも長い値に設定してある。
Next, the length L4 of the reflector 4 is 310 mm, which is set to a value longer than the length of the element of the radiator 3.

また，各エレメントは次の寸法でブーム上に配置されている。Ｄ１〜Ｄ１２は受信帯域の中心周波数６００ＭＨｚにおける波長の１３分の１〜５分の１に設定してある。具体的には，Ｄ１＝９０ｍｍ，Ｄ２＝８０ｍｍ，Ｄ３＝８０ｍｍ，Ｄ４＝８０ｍｍ，Ｄ５＝８０ｍｍ，Ｄ６＝８０ｍｍ，Ｄ７＝７０ｍｍ，Ｄ８＝７０ｍｍ，Ｄ９＝６０ｍｍ，Ｄ１０＝５０ｍｍ，Ｄ１１＝４０ｍｍ，Ｄ１２＝４０ｍｍに設定されている。Ｄ１３は受信帯域の中心周波数６００ＭＨｚにおける波長の約３分の１に設定してあり，具体的にはＤ１３＝１６０ｍｍに設定されている。
Each element is arranged on the boom with the following dimensions. D1 to D12 are set to 1/3 to 1/5 of the wavelength at the center frequency 600 MHz of the reception band. Specifically, D1 = 90 mm, D2 = 80 mm, D3 = 80 mm, D4 = 80 mm, D5 = 80 mm, D6 = 80 mm, D7 = 70 mm, D8 = 70 mm, D9 = 60 mm, D10 = 50 mm, D11 = 40 mm, D12 = 40 mm. D13 is set to about one third of the wavelength at the center frequency 600 MHz of the reception band, and specifically, D13 = 160 mm.

次に，本発明のＵＨＦアンテナと従来のオールバンドのＵＨＦアンテナにおける動作利得の各周波数特性について図３を用いて詳細に説明する。図３に示すとおり，本発明のアンテナにおいては３大都市圏での地上ディジタル放送帯域（第１の所定帯域）であるｃｈ１３〜ｃｈ３２では９ｄＢ以上の動作利得が得られており，従来のオールバンドアンテナより２〜３ｄＢ向上していることがわかる。また，３大都市圏での地上アナログ放送帯域（第２の所定帯域）であるｃｈ１３〜ｃｈ３６では従来のオールバンドアンテナと同等以上の動作利得が得られていることがわかる。
Next, each frequency characteristic of the operating gain in the UHF antenna of the present invention and the conventional all-band UHF antenna will be described in detail with reference to FIG. As shown in FIG. 3, in the antenna of the present invention, an operation gain of 9 dB or more is obtained in ch13 to ch32 which are terrestrial digital broadcasting bands (first predetermined bands) in three metropolitan areas. It can be seen that it is improved by 2-3 dB from the antenna. It can also be seen that the channel 13 to ch 36, which are analog terrestrial broadcasting bands (second predetermined bands) in the three metropolitan areas, have an operational gain equal to or higher than that of the conventional all-band antenna.

このように，地上ディジタル放送帯域の動作利得が改善されているため，従来のオールバンドアンテナを使用している地域より，サービスエリアを１．６倍程度に広げることができる。また，地上ディジタル放送の送信出力が段階的に上昇する過程で，定格出力より低い場合であっても安定した受信が可能になる。
As described above, since the operation gain of the terrestrial digital broadcasting band is improved, the service area can be expanded by about 1.6 times compared to the area where the conventional all-band antenna is used. In addition, in the process in which the transmission output of digital terrestrial broadcasting gradually increases, stable reception is possible even when the output is lower than the rated output.

次に，八木・宇田式アンテナ装置の動作について説明する。
八木・宇田式アンテナ装置１の給電部７には八木・宇田式アンテナ装置１で受信したテレビ信号を端末機器としてのテレビ受像機まで伝送するための伝送線（本実施例では同軸ケーブル）が接続されている。
Next, the operation of the Yagi / Uda antenna device will be described.
A transmission line (in this embodiment, a coaxial cable) for transmitting a television signal received by the Yagi / Uda type antenna device 1 to a television receiver as a terminal device is connected to the feeding section 7 of the Yagi / Uda type antenna device 1. Has been.

地上ディジタル放送および，アナログ放送の電波は複数の導波器２Ａ，２Ｂで放射器３に導波されると共に，放射器３を通過した放送電波は，反射器４で放射器側に反射され，その合成波が放射器３で受信される。放射器３で受信された上記放送信号は給電部７に内蔵された整合回路を介して，同軸ケーブルに出力され，前記同軸ケーブルの他端に接続されたテレビ受信機に供給され，画像や音声を楽しむことができる。   The radio waves of terrestrial digital broadcasting and analog broadcasting are guided to the radiator 3 by the plurality of waveguides 2A and 2B, and the broadcasting radio wave passing through the radiator 3 is reflected to the radiator side by the reflector 4. The synthesized wave is received by the radiator 3. The broadcast signal received by the radiator 3 is output to a coaxial cable via a matching circuit built in the power feeding unit 7, and is supplied to a television receiver connected to the other end of the coaxial cable. Can enjoy.

尚，本発明は上記実施の形態に限定されるものではなく，以下に例示するように，本発明の趣旨を逸脱しない範囲で各部を適宜に変更して実施することも可能である。
たとえば，上記実施例では導波器を２組使用して，それぞれ導波素子を各６本使用したがこれに限定されるものではなく，要求仕様を満足すれば，これよりも多くても少なくても良い。また，本実施例では放射器として，ビームダイポールアンテナを使用したが，通常の半波長ダイポールアンテナであっても良い。また，本実施例では反射器として４本の反射素子を使用したが，これに代えて，網状の板材を使用しても良い。
It should be noted that the present invention is not limited to the above-described embodiment, and can be implemented by appropriately changing each part without departing from the spirit of the present invention, as exemplified below.
For example, in the above embodiment, two sets of directors are used, and six waveguide elements are used. However, the present invention is not limited to this. If the required specifications are satisfied, the number may be more than this. May be. In this embodiment, a beam dipole antenna is used as the radiator, but a normal half-wave dipole antenna may be used. In this embodiment, four reflecting elements are used as reflectors, but a net-like plate material may be used instead.

本発明を適用した八木・宇田式アンテナ装置の説明図であり，（ａ）は正面図，（ｂ）は側面図である。It is explanatory drawing of the Yagi-Uda type | mold antenna apparatus to which this invention is applied, (a) is a front view, (b) is a side view. 図１に示した八木・宇田式アンテナ装置の寸法図である。FIG. 2 is a dimensional diagram of the Yagi / Uda type antenna device shown in FIG. 1. 図１に示した八木・宇田式アンテナ装置の周波数特性を示した説明図である。It is explanatory drawing which showed the frequency characteristic of the Yagi-Uda type | formula antenna apparatus shown in FIG.

符号の説明Explanation of symbols

１・１０…八木・宇田式アンテナ装置，２…導波器，３・３０…放射器，４・４０…反射器，５…アンテナ支持金具，６…ブーム，７・７０…給電部，２０・２１…導波素子。
DESCRIPTION OF SYMBOLS 1/10 ... Yagi-Uda type antenna apparatus, 2 ... Waveguide, 3.30 ... Radiator, 4.40 ... Reflector, 5 ... Antenna support bracket, 6 ... Boom, 7.70 ... Feeding part, 20. 21: Waveguide element.

Claims (3)

放射器と反射器と導波器を備えた八木・宇田式アンテナ装置において，
同じ長さの複数の導波器を１組とし，長さの異なる複数組の導波器を備えると共に，前記導波器の長さが前記放射器側ほど長くなるように設定されていることを特徴とした八木・宇田式アンテナ装置。
In Yagi-Uda type antenna equipment equipped with radiator, reflector and director,
A set of a plurality of waveguides having the same length is provided, and a plurality of waveguides having different lengths are provided, and the length of the waveguide is set to be longer toward the radiator side. Yagi-Uda type antenna device characterized by
前記導波器は２組からなり，各組を構成する導波素子の数が略等しい数に設定されていることを特徴とした請求項１に記載の八木・宇田式アンテナ装置。
2. The Yagi-Uda type antenna device according to claim 1, wherein the waveguide includes two sets, and the number of waveguide elements constituting each set is set to be approximately equal.
前記２組の導波器は各導波素子の長さが略２１０ｍｍと略２２０ｍｍに設定されていることを特徴とした請求項２に記載の八木・宇田式アンテナ装置。

The Yagi-Uda type antenna apparatus according to claim 2, wherein the length of each waveguide element of the two sets of waveguides is set to approximately 210 mm and approximately 220 mm.

JP2004223696A 2004-07-30 2004-07-30 Yagi / Uda antenna system Expired - Fee Related JP4147210B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103531917A (en) * 2013-09-12 2014-01-22 珠海德百祺科技有限公司 Broadband high-gain directional yagi antenna

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2445055A1 (en) * 2010-10-25 2012-04-25 Vodafone España, S.A.U. Antenna arrangement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103531917A (en) * 2013-09-12 2014-01-22 珠海德百祺科技有限公司 Broadband high-gain directional yagi antenna
CN103531917B (en) * 2013-09-12 2015-09-09 江苏省东方世纪网络信息有限公司 Broadband high-gain directional yagi antenna

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