JP4101829B2 - Dual polarization antenna - Google Patents

Dual polarization antenna Download PDF

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JP4101829B2
JP4101829B2 JP2005240594A JP2005240594A JP4101829B2 JP 4101829 B2 JP4101829 B2 JP 4101829B2 JP 2005240594 A JP2005240594 A JP 2005240594A JP 2005240594 A JP2005240594 A JP 2005240594A JP 4101829 B2 JP4101829 B2 JP 4101829B2
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reflector
polarized antenna
antenna element
polarization
side reflector
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JP2007060062A (en
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宏樹 八木
慎 水村
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NTT Docomo Inc
Nihon Dengyo Kosaku Co Ltd
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Nihon Dengyo Kosaku Co Ltd
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Description

本発明は、反射板付き偏波共用アンテナに係り、特に、水平偏波および垂直偏波のそれぞれに対して最適な反射板を有する偏波共用アンテナに関する。   The present invention relates to a dual-polarized antenna with a reflector, and more particularly to a dual-polarized antenna having a reflector that is optimal for horizontal polarization and vertical polarization.

図7は、従来の反射板付き偏波共用アンテナの一例を示す図であり、同図(a)は斜視図、同図(b)は正面図、同図(c)は要部断面図である。なお、図7(c)は、図7(a)のX−Z面で切断した断面構造を示す断面図である。
図7において、1は反射板であり、反射板1は、主反射面を構成する底面反射板10と、側面反射板11とを有する。
また、3は、垂直偏波用半波長ダイポールアンテナ素子(以下、垂直偏波用アンテナ素子という)、4は水平偏波用半波長ダイポールアンテナ素子(以下、水平偏波用アンテナ素子という)であり、これらのアンテナ素子(3,4)は、誘電体基板2上に形成される。
この図7は、垂直偏波重視で、水平面(図7(a)のX−Z)内ビーム幅が約80°の反射板付き偏波共用アンテナを製作した場合を図示している。
図7において、偏波共用アンテナの使用中心周波数の自由空間波長をλとするとき、垂直偏波用アンテナ素子3の長さ(el_V)、水平偏波用アンテナ素子4の長さ(el_H)、アンテナ素子(3,4)と底面反射板10との間隔(eh_V)、反射板1の幅(Rw_V)、並びに、側面反射板11の高さ(Rh_V)は、下記(1)式で表される。
[数1]
el_V=0.5λ×誘電体基板による短縮率
el_H=0.5λ×誘電体基板による短縮率
eh_V=約0.25λ
Rw_V=約0.6λ
Rh_V=約0.3λ ・・・・・・・・・・・・・・・・・・・・ (1)
図7に示す従来の反射板付き偏波共用アンテナの水平面内指向特性の測定結果を図8に示す。
図8(a)は、垂直偏波用アンテナ素子3の水平面内指向特性であり、図8(b)は、水平偏波用アンテナ素子4の水平面内指向特性である。
図8のグラフから、垂直偏波は水平面内ビーム幅が、約80°となったが、水平偏波は、水平面内ビーム幅が、100°を超え、且つ、F/B比も悪いということがわかる。
7A and 7B are diagrams showing an example of a conventional polarization sharing antenna with a reflector. FIG. 7A is a perspective view, FIG. 7B is a front view, and FIG. is there. FIG. 7C is a cross-sectional view showing a cross-sectional structure cut along the XZ plane of FIG.
In FIG. 7, reference numeral 1 denotes a reflection plate, and the reflection plate 1 includes a bottom surface reflection plate 10 that constitutes a main reflection surface and a side surface reflection plate 11.
Further, 3 is a vertically polarized half-wave dipole antenna element (hereinafter referred to as a vertically polarized antenna element), and 4 is a horizontally polarized half-wave dipole antenna element (hereinafter referred to as a horizontally polarized antenna element). These antenna elements (3, 4) are formed on the dielectric substrate 2.
FIG. 7 shows a case where a polarization sharing antenna with a reflector having a beam width of about 80 ° in the horizontal plane (XZ in FIG. 7A) is manufactured with emphasis on vertical polarization.
In FIG. 7, when the free space wavelength of the use center frequency of the polarization sharing antenna is λ, the length of the vertically polarized antenna element 3 (el_V), the length of the horizontally polarized antenna element 4 (el_H), The distance (eh_V) between the antenna elements (3, 4) and the bottom reflecting plate 10, the width (Rw_V) of the reflecting plate 1, and the height (Rh_V) of the side reflecting plate 11 are expressed by the following equation (1). The
[Equation 1]
el_V = 0.5λ × dielectric substrate shortening rate el_H = 0.5λ × dielectric substrate shortening rate eh_V = about 0.25λ
Rw_V = about 0.6λ
Rh_V = approx. 0.3λ (1)
FIG. 8 shows the measurement results of the directivity characteristics in the horizontal plane of the conventional dual-polarized antenna with a reflector shown in FIG.
8A shows the horizontal plane directivity of the vertically polarized antenna element 3, and FIG. 8B shows the horizontal plane directivity of the horizontally polarized antenna element 4. As shown in FIG.
From the graph of FIG. 8, vertical polarization has a horizontal plane beam width of about 80 °, but horizontal polarization has a horizontal plane beam width of over 100 ° and a poor F / B ratio. I understand.

図9は、従来の反射板付き偏波共用アンテナの他の例を示す図であり、同図(a)は斜視図、同図(b)は正面図、同図(c)は要部断面図である。なお、図9(c)は、図9(a)のX−Z面で切断した断面構造を示す断面図である。
この図9は、水平偏波重視で、水平面(図9(a)のX−Z)内ビーム幅が、約80°の反射板付き偏波共用アンテナを製作した場合を図示している。
図9において、偏波共用アンテナの使用中心周波数の自由空間波長をλとするとき、垂直偏波用アンテナ素子3の長さ(el_V)、水平偏波用アンテナ素子4の長さ(el_H)、アンテナ素子(3,4)と底面反射板10との間隔(eh_H)、反射板1の幅(Rw_H)、並びに、側面反射板11の高さ(Rh_H)は、下記(2)式で表される。
[数2]
el_V=0.5λ×誘電体基板による短縮率
el_H=0.5λ×誘電体基板による短縮率
eh_H=約0.25λ
Rw_H=約0.5λ
Rh_H=約0.15λ ・・・・・・・・・・・・・・・・・・・・ (2)
図9に示す従来の反射板付き偏波共用アンテナの水平面内指向特性の測定結果を図10に示す。
図10(a)は、垂直偏波用アンテナ素子3の水平面内指向特性であり、図10(b)は、水平偏波用アンテナ素子4の水平面内指向特性である。
図10のグラフから、水平偏波は水平面内ビーム幅が、約80°となったが、垂直偏波は水平面内ビーム幅が、約110°となってしまうことがわかる。
9A and 9B are diagrams showing another example of a conventional polarization sharing antenna with a reflector, where FIG. 9A is a perspective view, FIG. 9B is a front view, and FIG. FIG. FIG. 9C is a cross-sectional view showing a cross-sectional structure cut along the XZ plane of FIG.
FIG. 9 illustrates a case where a polarization sharing antenna with a reflector having a horizontal plane (XZ in FIG. 9A) with a beam width of about 80 ° is manufactured with emphasis on horizontal polarization.
In FIG. 9, when the free space wavelength of the use center frequency of the dual-polarized antenna is λ, the length of the vertically polarized antenna element 3 (el_V), the length of the horizontally polarized antenna element 4 (el_H), The distance (eh_H) between the antenna elements (3, 4) and the bottom reflecting plate 10, the width (Rw_H) of the reflecting plate 1, and the height (Rh_H) of the side reflecting plate 11 are expressed by the following equation (2). The
[Equation 2]
el_V = 0.5λ × dielectric substrate shortening rate el_H = 0.5λ × dielectric substrate shortening rate eh_H = about 0.25λ
Rw_H = about 0.5λ
Rh_H = about 0.15λ (2)
FIG. 10 shows the measurement results of the directivity characteristics in the horizontal plane of the conventional dual-polarized antenna with a reflector shown in FIG.
10A shows the directivity characteristics in the horizontal plane of the vertically polarized antenna element 3, and FIG. 10B shows the directivity characteristics in the horizontal plane of the horizontally polarized antenna element 4.
From the graph of FIG. 10, it can be seen that the horizontal polarization has a horizontal plane beam width of about 80 °, whereas the vertical polarization has a horizontal plane beam width of about 110 °.

前述したように、偏波によって反射板1の影響が異なるため、垂直偏波、水平偏波それぞれに最適な反射板1の形状が異なっている。
このような場合、従来の反射板付き偏波共用アンテナでは、どちらか片方の偏波に反射板1の形状を合わせておき、もう一方の偏波は素子高、素子形状を変えたり、無給電素子によるビーム制御を行う必要があった。
そのため、インピーダンス調整が困難になったり、アンテナの構造が複雑化する、もしくはビームが合わせきれずに最適なビームとは言えない状態になったりするという問題点があった。
本発明は、前記従来技術の問題点を解決するためになされたものであり、本発明の目的は、垂直偏波、水平偏波の両偏波に対し最適な反射板形状を有する偏波共用アンテナを提供することにある。
As described above, since the influence of the reflection plate 1 varies depending on the polarization, the optimum shape of the reflection plate 1 is different for each of the vertical polarization and the horizontal polarization.
In such a case, in the conventional dual-polarized antenna with a reflector, the shape of the reflector 1 is matched with one of the polarized waves, and the other polarized wave has a different element height, element shape, or no power supply. It was necessary to perform beam control by the element.
Therefore, there is a problem that impedance adjustment becomes difficult, the structure of the antenna becomes complicated, or the beam cannot be matched and the beam cannot be said to be an optimum beam.
The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to share polarization with an optimal reflector shape for both vertically polarized waves and horizontally polarized waves. To provide an antenna.

本願において開示される発明のうち、代表的なものの概要を簡単に説明すれば、下記の通りである。
前述の課題を解決するために、本発明の偏波共用アンテナは、反射板と、前記反射板の主反射面上に配置される水平偏波用アンテナ素子と垂直偏波用アンテナ素子とを有し、前記反射板は、前記主反射面の第1の方向の両側に設けられる側面反射板を有し、前記垂直偏波用アンテナ素子と前記水平偏波用アンテナ素子とは、前記側面反射板の延在方向に所定の間隔を置いて配置され、前記側面反射板は、切断面が前記側面反射板の延在方向となるように少なくとも2個の部分に分割されている
また、本発明は、反射板と、前記反射板の主反射面上に配置される水平偏波用アンテナ素子と垂直偏波用アンテナ素子とを有し、前記反射板は、前記主反射面の第1の方向の両側に設けられる側面反射板を有し、前記垂直偏波用アンテナ素子と前記水平偏波用アンテナ素子とは、前記側面反射板の延在方向に所定の間隔を置いて配置され、前記側面反射板は、切断面が前記側面反射板の延在方向となるように少なくとも2個の部分に分割され、λを使用中心周波数の自由空間波長とするとき、0.5λ以上の間隔をおいて、前記側面反射板の前記少なくとも2個に分割された部分を接続する接続部を有し、前記接続部前記側面反射板の延在方向の長さは、0.25λ以下であることを特徴とする。
また、本発明では、前記側面反射板の前記少なくとも2個に分割された部分の中で、前記側面反射板あるいは前記反射板から切り離された部分の、前記反射板の主反射面に垂直な方向の長さをLv、あるいは、前記第1の方向の長さをLh、λを使用中心周波数の自由空間波長とするとき、Lv≦0.25λ、Lh≦0.25λを満足する。
本発明の偏波共用アンテナでは、反射板の側面反射板を分割することによって(分離された側面反射板は偏波の関係上、水平偏波にほとんど影響しない)、両偏波に対し最適な反射板形状としたものである。
Of the inventions disclosed in this application, the outline of typical ones will be briefly described as follows.
In order to solve the above-described problems, a dual-polarized antenna according to the present invention includes a reflector, a horizontally polarized antenna element and a vertically polarized antenna element disposed on the main reflecting surface of the reflector. The reflector includes side reflectors provided on both sides in the first direction of the main reflector, and the vertically polarized antenna element and the horizontally polarized antenna element are the side reflectors. The side reflector is divided into at least two parts such that the cut surface is in the extension direction of the side reflector .
The present invention further includes a reflector, and a horizontally polarized antenna element and a vertically polarized antenna element disposed on the main reflection surface of the reflector, and the reflector is formed on the main reflection surface. Side reflectors provided on both sides in the first direction, and the vertically polarized antenna element and the horizontally polarized antenna element are arranged at a predetermined interval in the extending direction of the side reflector. The side reflector is divided into at least two parts so that the cut surface is in the extending direction of the side reflector, and when λ is a free space wavelength of the use center frequency, the side reflector is 0.5λ or more. There is a connection portion that connects the at least two divided portions of the side reflector at an interval, and the length of the connection portion in the extending direction of the side reflector is 0.25λ or less. characterized in that there.
Further, in the present invention, the direction perpendicular to the main reflecting surface of the reflecting plate of the side reflecting plate or the portion separated from the reflecting plate among the divided parts of the side reflecting plate. Where Lv is Lv, or the length in the first direction is Lh, and λ is the free space wavelength of the use center frequency, Lv ≦ 0.25λ and Lh ≦ 0.25λ are satisfied.
In this onset light polarization shared antenna, reflector by dividing the side reflectors (separated side reflectors on the relationship between polarization, little effect on horizontal polarization), the optimum for both polarizations It is a simple reflector shape.

本願において開示される発明のうち代表的なものによって得られる効果を簡単に説明すれば、下記の通りである。
本発明によれば、垂直偏波、水平偏波の両偏波に対し最適な反射板形状を有する偏波共用アンテナを提供することが可能となる。
The effects obtained by the representative ones of the inventions disclosed in the present application will be briefly described as follows.
ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the polarization sharing antenna which has the optimal reflector shape with respect to both the polarization of a vertical polarization and a horizontal polarization.

以下、図面を参照して本発明の実施例を詳細に説明する。
なお、実施例を説明するための全図において、同一機能を有するものは同一符号を付け、その繰り返しの説明は省略する。
[実施例1]
図1は、本発明の実施例1の反射板付き偏波共用アンテナを示す斜視図であり、図2(a)は、本発明の実施例1の反射板付き偏波共用アンテナの正面図、図2(b)は、本発明の実施例1の反射板付き偏波共用アンテナの要部断面図である。なお、図2(b)は、図1のX−Z面で切断した断面構造を示す断面図である。
図1、図2において、1は反射板であり、反射板1は、主反射面を構成する底面反射板10と、側面反射板を有する。本発明では、側面反射板は、底面反射板10に連続する部分11aと、部分11a(底面反射板10に連続する部分)から切り離された部分11bとで構成される。
この側面反射板の分離された部分11bは、例えば、絶縁性のスペーサなどにより、底面反射板10に連続する部分11aに支持・固定される。
また、3は、垂直偏波用半波長ダイポールアンテナ素子(以下、垂直偏波用アンテナ素子という)、4は水平偏波用半波長ダイポールアンテナ素子(以下、水平偏波用アンテナ素子という)であり、これらのアンテナ素子(3,4)は、誘電体基板2上に形成される。
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In all the drawings for explaining the embodiments, parts having the same functions are given the same reference numerals, and repeated explanation thereof is omitted.
[Example 1]
FIG. 1 is a perspective view showing a dual-polarization antenna with a reflector according to a first embodiment of the present invention. FIG. 2A is a front view of the dual-polarization antenna with a reflector according to a first embodiment of the present invention. FIG.2 (b) is principal part sectional drawing of the polarization-sharing antenna with a reflecting plate of Example 1 of this invention. 2B is a cross-sectional view showing a cross-sectional structure taken along the XZ plane of FIG.
1 and 2, reference numeral 1 denotes a reflector, and the reflector 1 includes a bottom reflector 10 constituting a main reflector and a side reflector. In the present invention, the side reflector is composed of a portion 11a continuous with the bottom reflector 10 and a portion 11b separated from the portion 11a (a portion continuous with the bottom reflector 10).
The separated portion 11b of the side reflector is supported and fixed to the portion 11a continuous to the bottom reflector 10 by, for example, an insulating spacer.
Further, 3 is a vertically polarized half-wave dipole antenna element (hereinafter referred to as a vertically polarized antenna element), and 4 is a horizontally polarized half-wave dipole antenna element (hereinafter referred to as a horizontally polarized antenna element). These antenna elements (3, 4) are formed on the dielectric substrate 2.

図1は、水平面(図1のX−Z)内ビーム幅が約80°(即ち、水平面内指向特性の半値幅が約80°のビーム幅)のアンテナ反射板付き偏波共用アンテナを製作した場合を図示している。
図1において、本発明の偏波共用アンテナの使用中心周波数の自由空間波長をλとすると、垂直偏波用アンテナ素子3の長さ(el_V)、水平偏波用アンテナ素子4の長さ(el_H)、アンテナ素子(3,4)と底面反射板10との間隔(eh)、底面反射板10の幅(Rw_1)、側面反射板の分離された部分11bの幅(Rw2)、側面反射板の底面反射板10に連続する部分11aの高さ(Rh1)、λ、側面反射板の分離された部分11bの高さ(Rh2)、並びに、側面反射板の分離された部分11bの長さ(L)は、下記(3)式で表される。
[数3]
el_V=0.5λ×誘電体基板による短縮率
el_H=0.5λ×誘電体基板による短縮率
eh=約0.25λ(eh=eh_V=eh_H)
Rw1=約0.5λ(Rw1=Rw_H)
Rw2=約0.6λ(Rw2=Rw_V)
Rh1=約0.15λ(Rh1=Rh _H)
Rh2=約0.3λ(Rh2=Rh _V)
L=約0.1λ ・・・・・・・・・・・・・・・・・・・・ (3)
In FIG. 1, a dual-polarized antenna with an antenna reflector having a beam width in the horizontal plane (XZ in FIG. 1) of about 80 ° (that is, a beam width in which the half width of the directivity in the horizontal plane is about 80 °) was manufactured. The case is illustrated.
In FIG. 1, when the free space wavelength of the use center frequency of the dual-polarized antenna of the present invention is λ, the length of the vertically polarized antenna element 3 (el_V) and the length of the horizontally polarized antenna element 4 (el_H) ), The distance (eh) between the antenna elements (3, 4) and the bottom reflector 10, the width of the bottom reflector 10 (Rw_1), the width of the separated portion 11b of the side reflector (Rw2), the side reflector The height (Rh1) and λ of the portion 11a continuous to the bottom reflector 10 and the height (Rh2) of the separated portion 11b of the side reflector, and the length (L) of the separated portion 11b of the side reflector ) Is represented by the following formula (3).
[Equation 3]
el_V = 0.5λ × dielectric substrate shortening rate el_H = 0.5λ × dielectric substrate shortening rate eh = about 0.25λ (eh = eh_V = eh_H)
Rw1 = about 0.5λ (Rw1 = Rw_H)
Rw2 = about 0.6λ (Rw2 = Rw_V)
Rh1 = about 0.15λ (Rh1 = Rh_H)
Rh2 = about 0.3λ (Rh2 = Rh_V)
L = about 0.1λ (3)

図1、図2に示す本発明の実施例1の反射板付き偏波共用アンテナの水平面内指向特性の測定結果を図3に示す。
図3(a)は、垂直偏波用アンテナ素子3の水平面内指向特性であり、図3(b)は、水平偏波用アンテナ素子4の水平面内指向特性である。
図3のグラフから、本発明では、垂直偏波、水平偏波共に水平面内ビーム幅が、約80°となっていることがわかる。
また、それぞれの水平面内指向特性を見ると、図8(a)、あるいは、図10(b)で示した、それぞれの偏波の最適な水平面内指向特性とほぼ同等の指向特性となっていることがわかる。
つまり電気的にみると、垂直偏波に対しては、図8(a)で示したような反射板1として、水平偏波に対しては、図10(b)で示したような反射板1として見えていることがわかる。
このように、側面反射板を分割することにより、両偏波に対して最適な特性を両立できる反射板とすることができる。
なお、側面反射板の分離された部分11bの長さ(L)は、0.25λを超えると水平偏波に影響が出始めるので、0.25λ以下にするのが望ましく、できない場合は、3個以上に分割すればよい。
また、側面反射板の分離された部分11bを含む側面反射板の垂直方向(図1のY軸方向)の長さは、1λ以下だと垂直偏波の反射板として機能しないため、1λ以上必要である。
なお、前述のまでの説明では、反射板1を完全に切り離した形状について説明したが、図4に示すように、垂直方向(図1のY軸方向)に0.5λ以上の間隔をあけて接続部11cにより接続してもよい。間隔は広ければ広いほど水平偏波に対する影響が少なくなり、当然まったく接続しないのが望ましい。なお、図4は、図1に示す反射板1の変形例を示す側面図である。
FIG. 3 shows the measurement results of the directivity characteristics in the horizontal plane of the dual-polarized antenna with a reflector according to the first embodiment of the present invention shown in FIGS.
3A shows the directivity characteristics in the horizontal plane of the vertically polarized antenna element 3, and FIG. 3B shows the directivity characteristics in the horizontal plane of the antenna element 4 for horizontal polarization.
From the graph of FIG. 3, it can be seen that in the present invention, the beam width in the horizontal plane is about 80 ° for both the vertical polarization and the horizontal polarization.
Further, looking at the respective horizontal plane directivity characteristics, the directivity characteristics are almost equivalent to the optimum horizontal plane directivity characteristics of the respective polarizations shown in FIG. 8A or 10B. I understand that.
That is, from an electrical viewpoint, the reflector 1 as shown in FIG. 8A for vertical polarization, and the reflector as shown in FIG. 10B for horizontal polarization. It can be seen that it is visible as 1.
In this way, by dividing the side reflector, it is possible to provide a reflector that can achieve optimum characteristics for both polarized waves.
If the length (L) of the separated portion 11b of the side reflector exceeds 0.25λ, it will start to affect the horizontal polarization, so it is desirable to make it 0.25λ or less. What is necessary is just to divide into more than.
Further, if the length in the vertical direction (Y-axis direction in FIG. 1) of the side reflector including the separated portion 11b of the side reflector is 1λ or less, it does not function as a vertically polarized reflector, and must be 1λ or more. It is.
In the above description, the shape in which the reflecting plate 1 is completely separated has been described. However, as shown in FIG. 4, the vertical direction (the Y-axis direction in FIG. 1) is spaced by 0.5λ or more. You may connect by the connection part 11c. The wider the distance, the less influence on the horizontal polarization, and naturally it is desirable not to connect at all. FIG. 4 is a side view showing a modification of the reflector 1 shown in FIG.

[実施例2]
図5は、本発明の実施例2の反射板付き偏波共用アンテナに使用される反射板1の形状を示す要部断面図であり、図5(a)は、垂直偏波に最適な反射板1の形状を示す要部断面図、図5(b)は、水平偏波に最適な反射板1の形状を示す要部断面図、図5(c)は、偏波に最適な反射板1の形状を示す要部断面図である。図5(c)が、本発明の実施例2の反射板1である。
図5(a)に示すように、垂直偏波用の反射板1は複雑な構造で、図5(b)に示すように、水平偏波用が単純な板状である。
側面反射板を分割し、垂直偏波に対しては、図5(a)に示すような反射板1として、水平偏波に対しては、図5(b)に示すような反射板1として見えるようにしたのが、図5(c)に示す反射板であり、この図5(c)おいて、側面反射板の分離された部分11bの長さ(L,L2,W,WW2)は、全て0.25λ以下とする。
[Example 2]
FIG. 5 is a cross-sectional view of the main part showing the shape of the reflector 1 used in the dual-polarized antenna with reflector according to the second embodiment of the present invention. FIG. FIG. 5B is a cross-sectional view of the main part showing the shape of the reflector 1 optimal for horizontal polarization, and FIG. 5C is the reflector optimal for the polarization. FIG. FIG.5 (c) is the reflecting plate 1 of Example 2 of this invention.
As shown in FIG. 5A, the vertical polarization reflector 1 has a complicated structure, and as shown in FIG. 5B, it has a simple plate shape for horizontal polarization.
The side reflector is divided into a reflector 1 as shown in FIG. 5A for vertical polarization, and a reflector 1 as shown in FIG. 5B for horizontal polarization. The reflector shown in FIG. 5C was made visible, and in FIG. 5C, the length (L, L2, W, WW2) of the separated portion 11b of the side reflector is , All 0.25λ or less.

[実施例3]
図6は、本発明の実施例2の反射板付き偏波共用アンテナに使用される反射板1の形状を示す要部断面図であり、図6(a)は、垂直偏波に最適な反射板1の形状を示す要部断面図、図6(b)は、水平偏波に最適な反射板1の形状を示す要部断面図、図6(c)は、偏波に最適な反射板1の形状を示す要部断面図である。図6(c)が、本発明の実施例2の反射板1である。
本実施例の反射板1は、図6に示すように、垂直偏波、水平偏波共に、水平方向(図6のX軸方向)に、2素子アレーとし、狭ビーム化した場合の反射板である。
側面反射板を分割し、垂直偏波に対しては、図6(a)に示すような反射板1として、水平偏波に対しては、図6(b)に示すような反射板1として見えるようにしたのが、図6(c)に示す反射板であり、図6(c)において、側面反射板の分離された部分11bの長さ(L3)は、0.25λ以下とする。
以上、本発明者によってなされた発明を、前記実施例に基づき具体的に説明したが、本発明は、前記実施例に限定されるものではなく、その要旨を逸脱しない範囲において種々変更可能であることは勿論である。
[Example 3]
FIG. 6 is a cross-sectional view of the main part showing the shape of the reflector 1 used in the dual-polarized antenna with reflector according to the second embodiment of the present invention. FIG. The principal part sectional view showing the shape of the plate 1, FIG. 6 (b) is the principal part sectional view showing the shape of the reflector 1 optimal for horizontal polarization, and FIG. 6 (c) is the reflector optimal for polarization. FIG. FIG.6 (c) is the reflecting plate 1 of Example 2 of this invention.
As shown in FIG. 6, the reflecting plate 1 of this embodiment is a two-element array in the horizontal direction (X-axis direction in FIG. 6) for both vertically polarized waves and horizontally polarized waves. It is.
The side reflector is divided into a reflector 1 as shown in FIG. 6A for vertical polarization, and a reflector 1 as shown in FIG. 6B for horizontal polarization. The reflector shown in FIG. 6C is made visible. In FIG. 6C, the length (L3) of the separated portion 11b of the side reflector is 0.25λ or less.
As mentioned above, the invention made by the present inventor has been specifically described based on the above embodiments. However, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Of course.

本発明の実施例1の反射板付き偏波共用アンテナを示す斜視図である。It is a perspective view which shows the polarization sharing antenna with a reflector of Example 1 of this invention. 本発明の実施例1の反射板付き偏波共用アンテナの正面と、要部断面構造を示す図である。It is a figure which shows the front of the polarization sharing antenna with a reflector of Example 1 of this invention, and principal part sectional structure. 本発明の実施例1の反射板付き偏波共用アンテナの水平面内指向特性の測定結果を示すグラフである。It is a graph which shows the measurement result of the horizontal plane directivity of the polarization sharing antenna with a reflector of Example 1 of the present invention. 本発明の実施例1の反射板の変形例を示す側面図である。It is a side view which shows the modification of the reflecting plate of Example 1 of this invention. 本発明の実施例2の反射板付き偏波共用アンテナに使用される反射板の形状を示す要部断面図である。It is principal part sectional drawing which shows the shape of the reflecting plate used for the polarization sharing antenna with a reflecting plate of Example 2 of this invention. 本発明の実施例3の反射板付き偏波共用アンテナに使用される反射板の形状を示す要部断面図である。It is principal part sectional drawing which shows the shape of the reflecting plate used for the polarization sharing antenna with a reflecting plate of Example 3 of this invention. 従来の反射板付き偏波共用アンテナの一例を示す図である。It is a figure which shows an example of the conventional polarization sharing antenna with a reflecting plate. 図7に示す従来の反射板付き偏波共用アンテナの水平面内指向特性の測定結果を示すグラフである。It is a graph which shows the measurement result of the directional characteristic in the horizontal surface of the conventional polarized-wave antenna with a reflecting plate shown in FIG. 従来の反射板付き偏波共用アンテナの他の例を示す図である。It is a figure which shows the other example of the conventional polarized-wave antenna with a reflecting plate. 図9に示す従来の反射板付き偏波共用アンテナの水平面内指向特性の測定結果を示すグラフである。It is a graph which shows the measurement result of the directional characteristic in the horizontal surface of the conventional polarization-sharing antenna with a reflecting plate shown in FIG.

符号の説明Explanation of symbols

1 反射板
2 誘電体基板
3 垂直偏波用半波長ダイポールアンテナ素子
4 水平偏波用半波長ダイポールアンテナ素子
10 底面反射板
11 側面反射板
11a 底面反射板10に連続する部分
11b 部分11aから切り離された部分
11c 接続部
DESCRIPTION OF SYMBOLS 1 Reflector 2 Dielectric substrate 3 Vertically polarized half-wave dipole antenna element 4 Horizontally polarized half-wave dipole antenna element 10 Bottom reflector 11 Side reflector 11a Part connected to bottom reflector 10 11b Separated from part 11a 11c connection part

Claims (4)

反射板と、
前記反射板の主反射面上に配置される水平偏波用アンテナ素子と垂直偏波用アンテナ素子とを有し、
前記反射板は、前記主反射面の第1の方向の両側に設けられる側面反射板を有し、
前記垂直偏波用アンテナ素子と前記水平偏波用アンテナ素子とは、前記側面反射板の延在方向に所定の間隔を置いて配置され、
前記側面反射板は、切断面が前記側面反射板の延在方向となるように少なくとも2個の部分に分割されていることを特徴とする偏波共用アンテナ。
A reflector,
A horizontally polarized antenna element and a vertically polarized antenna element disposed on the main reflecting surface of the reflector;
The reflector has side reflectors provided on both sides in the first direction of the main reflector,
The vertically polarized antenna element and the horizontally polarized antenna element are disposed at a predetermined interval in the extending direction of the side reflector,
The dual-polarized antenna according to claim 1, wherein the side reflector is divided into at least two portions so that a cut surface is in an extending direction of the side reflector .
反射板と、
前記反射板の主反射面上に配置される水平偏波用アンテナ素子と垂直偏波用アンテナ素子とを有し、
前記反射板は、前記主反射面の第1の方向の両側に設けられる側面反射板を有し、
前記垂直偏波用アンテナ素子と前記水平偏波用アンテナ素子とは、前記側面反射板の延在方向に所定の間隔を置いて配置され、
前記側面反射板は、切断面が前記側面反射板の延在方向となるように少なくとも2個の部分に分割され、
λを使用中心周波数の自由空間波長とするとき、0.5λ以上の間隔をおいて、前記側面反射板の前記少なくとも2個に分割された部分を接続する接続部を有し、
前記接続部前記側面反射板の延在方向の長さは、0.25λ以下であることを特徴とする偏波共用アンテナ。
A reflector,
A horizontally polarized antenna element and a vertically polarized antenna element disposed on the main reflecting surface of the reflector;
The reflector has side reflectors provided on both sides in the first direction of the main reflector,
The vertically polarized antenna element and the horizontally polarized antenna element are disposed at a predetermined interval in the extending direction of the side reflector,
The side reflector is divided into at least two parts such that the cut surface is in the extending direction of the side reflector,
When λ is a free space wavelength of the center frequency of use, it has a connection part that connects the at least two parts of the side reflector with an interval of 0.5λ or more,
The length of the connection part in the extending direction of the side reflector is 0.25λ or less .
前記側面反射板の前記少なくとも2個に分割された部分の中で、前記側面反射板あるいは前記反射板から切り離された部分の、前記反射板の主反射面に垂直な方向の長さをLv、λを使用中心周波数の自由空間波長とするとき、Lv≦0.25λを満足することを特徴とする請求項1または請求項2に記載の偏波共用アンテナ。 Among the at least two parts of the side reflector, the length in the direction perpendicular to the main reflecting surface of the reflector of the side reflector or the part separated from the reflector is Lv, 3. The dual- polarized antenna according to claim 1, wherein Lv ≦ 0.25λ is satisfied when λ is a free space wavelength of a use center frequency . 前記側面反射板の前記少なくとも2個に分割された部分の中で、前記側面反射板あるいは前記反射板から切り離された部分の、前記第1の方向の長さをLh、λを使用中心周波数の自由空間波長とするとき、Lh≦0.25λを満足することを特徴とする請求項1または請求項2に記載の偏波共用アンテナ。 Of the portion of the side reflector divided into the at least two parts, the length in the first direction of the side reflector or the portion separated from the reflector is Lh and λ are used as the center frequency. The dual- polarized antenna according to claim 1 or 2, wherein Lh ≦ 0.25λ is satisfied when the free space wavelength is set .
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