JP5187222B2 - Antenna device, radome, and unnecessary radiation wave prevention method - Google Patents

Antenna device, radome, and unnecessary radiation wave prevention method Download PDF

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JP5187222B2
JP5187222B2 JP2009032878A JP2009032878A JP5187222B2 JP 5187222 B2 JP5187222 B2 JP 5187222B2 JP 2009032878 A JP2009032878 A JP 2009032878A JP 2009032878 A JP2009032878 A JP 2009032878A JP 5187222 B2 JP5187222 B2 JP 5187222B2
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side wall
radome
shroud
electromagnetic wave
wall portion
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JP2010192992A (en
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伸彦 小熊
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NEC Corp
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本発明は、背面方向の放射特性に優れたアンテナ装置並びにアンテナ背面方向への放射特性を向上させるレドーム及び不要放射波防止方法に関する。   The present invention relates to an antenna device having excellent radiation characteristics in the back direction, a radome for improving radiation characteristics in the antenna back direction, and a method for preventing unwanted radiation.

近年、アンテナ装置には、優れた放射特性が強く求められている。   In recent years, excellent radiation characteristics are strongly demanded for antenna devices.

図４〜図７に、本発明に関連するシート状のレドーム１を使用した開口面アンテナの構成を示す。この開口面アンテナは、放射器４から発せられた電磁波を正面方向に反射する反射鏡２を備えている。反射鏡２の周縁にはシュラウド３が設けられている。シート状のレドーム１は、シュラウド３を正面側から被さるように覆っており、シュラウド３の外壁に設置された取付金具７に取付ボルト５及びナット８で固定されている。   4 to 7 show the configuration of the aperture antenna using the sheet-like radome 1 related to the present invention. The aperture antenna includes a reflecting mirror 2 that reflects electromagnetic waves emitted from the radiator 4 in the front direction. A shroud 3 is provided on the periphery of the reflecting mirror 2. The sheet-shaped radome 1 covers the shroud 3 so as to cover from the front side, and is fixed to a mounting bracket 7 installed on the outer wall of the shroud 3 with mounting bolts 5 and nuts 8.

このような構造のアンテナ装置においては、反射板支持部材６を設置するための開口部を反射鏡２の中央部に設ける必要がある。従って、放射器４から発せられた電磁波の一部は、アンテナ装置の背面方向へも放射される。   In the antenna device having such a structure, it is necessary to provide an opening for installing the reflecting plate support member 6 at the center of the reflecting mirror 2. Accordingly, a part of the electromagnetic wave emitted from the radiator 4 is also radiated toward the back surface of the antenna device.

背面方向へ放射される電磁波の一部は、図８に示すように、反射鏡２の背面側及びシュラウド３の外壁を伝って伝播し、シュラウド３の端部から回り込んで反射鏡２の正面側まで到達する。   As shown in FIG. 8, a part of the electromagnetic wave radiated in the back direction propagates along the back side of the reflecting mirror 2 and the outer wall of the shroud 3, wraps around from the end of the shroud 3, and the front of the reflecting mirror 2. To the side.

これにより、アンテナ背面方向のエネルギーがアンテナ放射方向のエネルギーとして検出され、アンテナ背面方向の放射パターンを劣化させている。   Thereby, the energy in the antenna back direction is detected as the energy in the antenna radiation direction, and the radiation pattern in the antenna back direction is deteriorated.

開口面アンテナの放射特性の改善をすることに関連する技術として、特許文献１に開示される「開口面アンテナ」がある。特許文献１に開示される発明は、レドーム端部のフランジを導電材料又は電磁波吸収体で覆うことにより、レドーム端部のフランジから放射される不要放射波を低減するものである。   As a technique related to improving the radiation characteristics of the aperture antenna, there is an “aperture antenna” disclosed in Patent Document 1. The invention disclosed in Patent Document 1 reduces unwanted radiated waves radiated from a flange at the radome end by covering the flange at the radome end with a conductive material or an electromagnetic wave absorber.

特開２００３−１４２９１８号公報JP 2003-142918 A

しかし、特許文献１に開示される構造では、アンテナ背面方向から反射鏡を伝わってきた電磁波は、フランジ部分の隙間から反射鏡内面側に回り込んでしまう。
すなわち、特許文献１に開示される発明は、アンテナの正面側に放射されたエネルギーの一部がレドーム内部を伝わってレドーム端のフランジから不要放射波として放射されることを防ぐことを目的としたものであり、アンテナ背面方向から反射鏡の外面を伝わってきた電磁波が反射鏡の正面に回り込むことを防止することを目的とはしていない。 However, in the structure disclosed in Patent Document 1, the electromagnetic wave transmitted through the reflecting mirror from the antenna back direction wraps around the inner surface of the reflecting mirror through the gap between the flange portions.
That is, the invention disclosed in Patent Document 1 aims to prevent a part of the energy radiated to the front side of the antenna from being transmitted through the inside of the radome and radiated as an unnecessary radiation wave from the flange at the radome end. It is not intended to prevent electromagnetic waves that have traveled from the rear side of the antenna to the outer surface of the reflecting mirror from entering the front of the reflecting mirror.

また、特許文献１に開示される構造では、フランジを備えたドーム状のレドームのフランジを電磁波吸収体等で覆うため、加工が容易ではなく、レドームの製造コストが高くなってしまう。   Further, in the structure disclosed in Patent Document 1, since the flange of the dome-shaped radome having the flange is covered with an electromagnetic wave absorber or the like, processing is not easy, and the manufacturing cost of the radome increases.

本発明は係る問題に鑑みてなされたものであり、アンテナ背面方向から反射鏡の外面を伝わってきた電磁波が反射鏡の正面に回り込むことを低コストで防止したアンテナ装置、レドーム及び不要放射波防止方法を提供することを目的とする。   The present invention has been made in view of such problems, and an antenna device, a radome, and an unnecessary radiation wave prevention that prevent the electromagnetic wave transmitted from the rear surface of the antenna from traveling to the front surface of the reflecting mirror from entering the front surface of the reflecting mirror at low cost. It aims to provide a method.

本発明のレドームは、放射器と放射器から放射された電磁波を所定の方向へ反射する反射板と反射板の周縁に設けられたシュラウドとを有する開口面アンテナに装着されるレドームであって、反射板の開口面と略同一形状の平面部とそれを取り囲む側壁部とがキャップ状を呈し、開口面アンテナと対向する側には、側壁部に沿って延伸した板状の電磁波吸収体が、平面部と側壁部との境界をまたぐように設置される。  The radome of the present invention is a radome attached to an aperture antenna having a radiator, a reflector that reflects electromagnetic waves radiated from the radiator in a predetermined direction, and a shroud provided at the periphery of the reflector, A plane portion having substantially the same shape as the opening surface of the reflecting plate and a side wall portion surrounding it have a cap shape, and on the side facing the opening surface antenna, a plate-like electromagnetic wave absorber extending along the side wall portion is provided. It is installed so as to straddle the boundary between the flat surface portion and the side wall portion.

また、本発明のアンテナ装置は、放射器と放射器から放射された電磁波を所定の方向へ反射する反射板と反射板の周縁に設けられたシュラウドとを有するアンテナ本体と、反射板の開口面と略同一形状の平面部とそれを取り囲む側壁部とがキャップ状を呈しアンテナ本体をシュラウド側から被さるように覆うレドームとを有し、レドームのアンテナ本体と対向する側には、側壁部に沿って延伸した板状の電磁波吸収体が平面部と側壁部との境界をまたぐように設置されており、電磁波吸収体がシュラウドの端部と当接する。 The antenna device according to the present invention includes an antenna body having a radiator, a reflector that reflects electromagnetic waves radiated from the radiator in a predetermined direction, and a shroud provided at the periphery of the reflector, and an opening surface of the reflector. And a side wall that surrounds the flat body and a side wall that surrounds the antenna main body so as to cover the shroud side. The plate-shaped electromagnetic wave absorber extended in this manner is installed so as to straddle the boundary between the flat surface portion and the side wall portion, and the electromagnetic wave absorber contacts the end portion of the shroud.

また、本発明の方法は、放射器と放射器から放射された電磁波を所定の方向へ反射する反射板と反射板の周縁に設けられたシュラウドと有するアンテナ本体に、反射板の開口面と略同一形状の平面部とそれを取り囲む側壁部とがキャップ状を呈し、アンテナ本体と対向する側には側壁部に沿って延伸した板状の電磁波吸収体が平面部と側壁部との境界をまたぐように設置されたレドームを、シュラウド側から被せて覆い、電磁波吸収体をシュラウドの端部と当接させる。 In addition, the method of the present invention includes a radiator, a reflector that reflects electromagnetic waves radiated from the radiator in a predetermined direction, and a shroud provided at the periphery of the reflector. The flat part having the same shape and the side wall surrounding the same form a cap shape, and a plate-like electromagnetic wave absorber extending along the side wall part on the side facing the antenna body straddles the boundary between the flat part and the side wall part. The radome placed in this manner is covered and covered from the shroud side, and the electromagnetic wave absorber is brought into contact with the end portion of the shroud.

本発明によれば、アンテナ背面方向から反射鏡の外面を伝わってきた電磁波が反射鏡の正面に回り込むことを低コストで防止したアンテナ装置、レドーム及び不要放射波防止方法を提供できる。   According to the present invention, it is possible to provide an antenna device, a radome, and an unnecessary radiated wave prevention method that can prevent the electromagnetic waves transmitted from the rear surface of the antenna from traveling to the outer surface of the reflector from entering the front of the reflector at low cost.

本発明の好適な実施の形態に係るアンテナ装置の構成を示す図である。It is a figure which shows the structure of the antenna apparatus which concerns on suitable embodiment of this invention. 本発明の好適な実施の形態に係るアンテナ装置のレドームの取付部分の詳細な構成を示す図である。It is a figure which shows the detailed structure of the attachment part of the radome of the antenna apparatus which concerns on suitable embodiment of this invention. 反射鏡の背面側及びシュラウドの外壁を伝って伝播してきた電磁波が電磁波吸収体で減衰される状態を示す図である。It is a figure which shows the state which the electromagnetic waves which propagated along the back side of a reflective mirror and the outer wall of a shroud are attenuate | damped by an electromagnetic wave absorber. 本発明に関連するシート状のレドームを使用した開口面アンテナの構成を示す図である。It is a figure which shows the structure of the aperture surface antenna which uses the sheet-like radome relevant to this invention. 本発明に関連するシート状のレドームを使用した開口面アンテナの構成を示す図である。It is a figure which shows the structure of the aperture surface antenna which uses the sheet-like radome relevant to this invention. 本発明に関連するシート状のレドームを使用した開口面アンテナの構成を示す図である。It is a figure which shows the structure of the aperture surface antenna which uses the sheet-like radome relevant to this invention. 本発明に関連するシート状のレドームを使用した開口面アンテナの構成を示す図である。It is a figure which shows the structure of the aperture surface antenna which uses the sheet-like radome relevant to this invention. 反射鏡の背面側及びシュラウドの外壁を伝って伝播した電磁波が、シュラウドの端部から回り込んで反射鏡の正面側まで到達する状態を示す図である。It is a figure which shows the state which the electromagnetic waves propagated along the back side of a reflective mirror and the outer wall of a shroud wrap around from the edge part of a shroud, and reach | attain to the front side of a reflective mirror.

本発明の好適な実施の形態について説明する。
図１、図２に、本実施形態に係るアンテナ装置の構成を示す。このアンテナ装置は、放射器１４から発せられた電磁波を正面方向に反射する反射鏡１２を備えている。反射鏡１２の周縁にはシュラウド１３が設けられている。
シート状のレドーム１１は、周縁部が折り重ねられて平面部１１ａと側壁部１１ｂとからなる略円形のキャップ状となっている。レドーム１１の側壁部１１ｂには複数のポケット１９が設けられており、平面部１１ａを取り囲んでいる。レドーム１１は、シュラウド１３を正面側から覆うように、シュラウド１３の外壁に設置された取付金具１７に取付ボルト１５及びナット１８で固定される。 A preferred embodiment of the present invention will be described.
1 and 2 show the configuration of the antenna device according to the present embodiment. The antenna device includes a reflecting mirror 12 that reflects electromagnetic waves emitted from the radiator 14 in the front direction. A shroud 13 is provided on the periphery of the reflecting mirror 12.
The sheet-like radome 11 has a substantially circular cap shape having a peripheral portion folded and a plane portion 11a and a side wall portion 11b. A plurality of pockets 19 are provided in the side wall portion 11b of the radome 11, and surround the flat surface portion 11a. The radome 11 is fixed to the mounting bracket 17 installed on the outer wall of the shroud 13 with mounting bolts 15 and nuts 18 so as to cover the shroud 13 from the front side.

各ポケット１９には電磁波吸収体２０が収容される。各ポケット１９に収容された電磁波吸収体２０は、一部がポケット１９からはみ出ている。   Each pocket 19 contains an electromagnetic wave absorber 20. A part of the electromagnetic wave absorber 20 accommodated in each pocket 19 protrudes from the pocket 19.

ポケット１９に電磁波吸収体２０を収容したレドーム１１をシュラウド１３に被せると、ポケット１９からはみ出た電磁波吸収体２０がシュラウド１３の端部に当接する。これにより、図３に示すように、シュラウド１３の端部と電磁波吸収体２０とが接触して配置された状態となる。
図３に示す状態では、反射鏡１２の背面側及びシュラウド１３の外壁を伝って伝播してきた電磁波が電磁波吸収体２０で減衰され、シュラウド１３の端部から反射鏡１２の正面側に回り込込めない。これにより、アンテナ背面方向の放射特性が改善される。 When the radome 11 containing the electromagnetic wave absorber 20 in the pocket 19 is put on the shroud 13, the electromagnetic wave absorber 20 protruding from the pocket 19 comes into contact with the end portion of the shroud 13. Thereby, as shown in FIG. 3, the end portion of the shroud 13 and the electromagnetic wave absorber 20 are arranged in contact with each other.
In the state shown in FIG. 3, the electromagnetic wave propagating through the back side of the reflecting mirror 12 and the outer wall of the shroud 13 is attenuated by the electromagnetic wave absorber 20, and wraps around from the end of the shroud 13 to the front side of the reflecting mirror 12. Absent. This improves the radiation characteristics in the antenna back direction.

上記構成においては、レドームにフランジを設ける必要はない。また、電磁波吸収体はポケットに収納するだけで容易にレドームに設置可能である。従って、低コストでレドームを製造可能である。   In the above configuration, it is not necessary to provide a flange on the radome. Moreover, the electromagnetic wave absorber can be easily installed on the radome simply by being stored in the pocket. Therefore, the radome can be manufactured at low cost.

このように、本実施形態に係るアンテナ装置は、アンテナ背面方向から反射鏡を伝わってきた電磁波がアンテナ正面方向に放射されることを低コストで防止できる。   As described above, the antenna device according to the present embodiment can prevent the electromagnetic wave transmitted through the reflecting mirror from the antenna back direction from being radiated in the antenna front direction at a low cost.

なお、上記実施形態は本発明の好適な実施の一例であり、本発明はこれに限定されることはない。
例えば、上記実施形態においては、レドームにポケットを設けて電磁波吸収体を収容する構成を例としたが、レドームに電磁波吸収体を接着するなどしても良い。
このように、本発明は様々な変形が可能である。 In addition, the said embodiment is an example of suitable implementation of this invention, and this invention is not limited to this.
For example, in the above embodiment, the radome is provided with a pocket to accommodate the electromagnetic wave absorber, but the electromagnetic wave absorber may be bonded to the radome.
As described above, the present invention can be variously modified.

１１ レドーム
１２ 反射鏡
１３ シュラウド
１４ 放射器
１５ 取付ボルト
１７ 取付金具
１８ ナット
１９ ポケット
２０ 電磁波吸収体 DESCRIPTION OF SYMBOLS 11 Radome 12 Reflector 13 Shroud 14 Radiator 15 Mounting bolt 17 Mounting bracket 18 Nut 19 Pocket 20 Electromagnetic wave absorber

Claims (7)

放射器と、放射器から放射された電磁波を所定の方向へ反射する反射板と、該反射板の周縁に設けられたシュラウドとを有する開口面アンテナに装着されるレドームであって、
前記反射板の開口面と略同一形状の平面部とそれを取り囲む側壁部とがキャップ状を呈し、
前記開口面アンテナと対向する側には、前記平面部と前記側壁部との境界をまたぐように電磁波吸収体が設置され、前記側壁部に前記電磁波吸収体を収容する複数の袋状部が設けられていることを特徴とするレドーム。 A radome attached to an aperture antenna having a radiator, a reflector that reflects electromagnetic waves radiated from the radiator in a predetermined direction, and a shroud provided at a periphery of the reflector;
A flat portion having substantially the same shape as the opening surface of the reflecting plate and a side wall portion surrounding it have a cap shape,
On the side facing the aperture antenna, an electromagnetic wave absorber is installed so as to straddle the boundary between the planar portion and the side wall portion, and a plurality of bag-like portions for accommodating the electromagnetic wave absorber are provided on the side wall portion. is it radome characterized by Rukoto. 放射器と、放射器から放射された電磁波を所定の方向へ反射する反射板と、該反射板の周縁に設けられたシュラウドとを有する開口面アンテナに装着されるレドームであって、
前記反射板の開口面と略同一形状の平面部とそれを取り囲む側壁部とがキャップ状を呈し、
前記開口面アンテナと対向する側には、前記側壁部に沿って延伸した板状の電磁波吸収体が前記平面部と前記側壁部との境界をまたぐように設置されることを特徴とするレドーム。 A radome attached to an aperture antenna having a radiator, a reflector that reflects electromagnetic waves radiated from the radiator in a predetermined direction, and a shroud provided at a periphery of the reflector;
A flat portion having substantially the same shape as the opening surface of the reflecting plate and a side wall portion surrounding it have a cap shape,
A radome, wherein a plate-like electromagnetic wave absorber extending along the side wall portion is installed on the side facing the aperture antenna so as to straddle the boundary between the flat portion and the side wall portion . 放射器と、放射器から放射された電磁波を所定の方向へ反射する反射板と、該反射板の
周縁に設けられたシュラウドとを有するアンテナ本体と、
前記反射板の開口面と略同一形状の平面部とそれを取り囲む側壁部とがキャップ状を呈
し、前記アンテナ本体を前記シュラウド側から被さるように覆うレドームとを有し、
前記レドームの前記アンテナ本体と対向する側には、前記平面部と前記側壁部との境界
をまたぐように電磁波吸収体が設置され、前記側壁部に前記電磁波吸収体を収容する複数の袋状部が設けられ、前記電磁波吸収体はその一部がはみ出すように前記袋状部に収容され、はみ出した部分が前記シュラウドの端部と当接することを特徴とするアンテナ装置。 An antenna main body having a radiator, a reflector that reflects electromagnetic waves radiated from the radiator in a predetermined direction, and a shroud provided at the periphery of the reflector;
A plane part having substantially the same shape as the opening surface of the reflector and a side wall part surrounding the flat part have a cap shape, and have a radome that covers the antenna body so as to cover the shroud side,
An electromagnetic wave absorber is installed on the side of the radome facing the antenna main body so as to straddle the boundary between the planar portion and the side wall portion, and a plurality of bag-like portions that house the electromagnetic wave absorber in the side wall portion The antenna device is characterized in that the electromagnetic wave absorber is accommodated in the bag-like portion so that a part thereof protrudes, and the protruding portion abuts against an end portion of the shroud . 放射器と、A radiator,
放射器から放射された電磁波を所定の方向へ反射する反射板と、A reflector that reflects electromagnetic waves radiated from the radiator in a predetermined direction;
該反射板の周縁に設けられたシュラウドとA shroud provided at the periphery of the reflector;
を有するアンテナ本体と、An antenna body having
前記反射板の開口面と略同一形状の平面部とそれを取り囲む側壁部とがキャップ状を呈  A flat portion having substantially the same shape as the opening surface of the reflecting plate and a side wall portion surrounding the flat portion have a cap shape.
し、前記アンテナ本体を前記シュラウド側から被さるように覆うレドームとAnd a radome covering the antenna body so as to cover the shroud side
を有し、Have
前記レドームの前記アンテナ本体と対向する側には、前記側壁部に沿って延伸した板状の電磁波吸収体が前記平面部と前記側壁部との境界をまたぐように設置されており、  On the side of the radome facing the antenna body, a plate-like electromagnetic wave absorber extending along the side wall portion is installed so as to straddle the boundary between the plane portion and the side wall portion,
前記電磁波吸収体が、前記シュラウドの端部と当接する  The electromagnetic wave absorber contacts the end of the shroud.
ことを特徴とするアンテナ装置。An antenna device characterized by that. 前記レドームは、シート状の部材の周縁部を折り重ねることによって前記側壁部が形成
されていることを特徴とする請求項３又は４記載のアンテナ装置。 The antenna device according to claim 3 or 4, wherein the radome has the side wall portion formed by folding a peripheral portion of a sheet-like member. 放射器と、放射器から放射された電磁波を所定の方向へ反射する反射板と、該反射板の
周縁に設けられたシュラウドとを有するアンテナ本体を、前記反射板の開口面と略同一形
状の平面部とそれを取り囲む側壁部とがキャップ状を呈し、前記アンテナ本体と対向する
側には前記平面部と前記側壁部との境界をまたぐように電磁波吸収体が設置され、前記側壁部に前記電磁波吸収体を収容する複数の袋状部が設けられたレドームを前記シュラウド側から被せて覆い、
前記電磁波吸収体はその一部がはみ出すように前記袋状部に収容され、はみ出した部分が前記シュラウドの端部と当接することを特徴とする不要放射波防止方法。 An antenna body having a radiator, a reflecting plate that reflects electromagnetic waves radiated from the radiator in a predetermined direction, and a shroud provided at the periphery of the reflecting plate has substantially the same shape as the opening surface of the reflecting plate. The flat surface portion and the side wall portion surrounding the flat surface portion have a cap shape, and an electromagnetic wave absorber is installed on the side facing the antenna body so as to straddle the boundary between the flat surface portion and the side wall portion. Covering and covering the radome provided with a plurality of bag-like portions containing the electromagnetic wave absorber from the shroud side,
The electromagnetic wave absorber is accommodated in the bag-like portion so that a part thereof protrudes, and the protruding portion contacts an end portion of the shroud . 放射器と、A radiator,
放射器から放射された電磁波を所定の方向へ反射する反射板と、A reflector that reflects electromagnetic waves radiated from the radiator in a predetermined direction;
該反射板の周縁に設けられたシュラウドとA shroud provided at the periphery of the reflector;
を有するアンテナ本体に、In the antenna body having
前記反射板の開口面と略同一形状の平面部とそれを取り囲む側壁部とがキャップ状を呈し、前記アンテナ本体と対向する側には、前記側壁部に沿って延伸した板状の電磁波吸収体が前記平面部と前記側壁部との境界をまたぐように設置されたレドームを  A planar electromagnetic wave absorber extending along the side wall portion on the side facing the antenna body on the side facing the antenna body has a flat portion having substantially the same shape as the opening surface of the reflecting plate and a side wall portion surrounding the flat portion. A radome installed across the boundary between the plane portion and the side wall portion.
前記シュラウド側から被せて覆い、Cover and cover from the shroud side,
前記電磁波吸収体を、前記シュラウドの端部と当接させる  The electromagnetic wave absorber is brought into contact with an end portion of the shroud.
ことを特徴とする不要放射波防止方法。A method for preventing unwanted radiation waves.
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