JP2012175680A - ホーンアレイアンテナ - Google Patents
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Abstract
【解決手段】本発明のホーンアレイアンテナは、導波管に接続される第1の角度を有する第1テーパ部と、前記第1テーパ部と放射面との間に設けられ、放射又は受信する電波の波長に対して所定の関係を満たす長さを有し、かつ、開口面に対して略垂直の角度を有する第2テーパ部と、を有するホーンアンテナ素子を複数配列することにより形成される。当該構成を採ることによりグレーティングローブを抑制することができる。
【選択図】図1
Description
以下、図面を参照して本発明の実施の形態について説明する。図1は、本実施の形態1に係るホーンアンテナ素子の形状を示した斜視図であり、図2は、当該ホーンアンテナ素子を縦8列横8列の計64個配列したアレイアンテナの外観図である。
Sinθn = Sinθ0 + nλ/d (1)
θ0:主ビームの方向
θn:グレーティングローブの方向
n:自然数
d:素子間隔
図9に、本発明の別の形態のホーンアレイアンテナの断面図を示す。図9(a)に示すホーンアンテナ素子は、テーパ部分からストレート部分まで多段で変換する形状を有する。すなわち、開口面に垂直な角度を有するホーン軸Yに対して第1のテーパ角度φ1を有する第1テーパ部10と、ホーン軸Yに対してほぼ平行な角度を有する(開口面に対してほぼ垂直な角度を有する)第2テーパ部11との間に、第1のテーパ角度φ1と平行な角度(0度)の中間の角度φ3、φ4・・φNを有する第3、第4、・・第Nのテーパ部16を有する構成としている。導波管に接続される第1テーパ部10と電波の放射面付近に設けられた第2テーパ部11とを中間角度を有するテーパ部を用いて接続することで、球面波から平面波への変換をスムーズに行うことができる。
変形例2に係るホーンアレイアンテナは、ホーンアレイアンテナの開口に誘電体レンズを設置する構造をとっている。まず、図10を用いて誘電体レンズの作用について説明する。
(付記)
(2)前記第2テーパ部は、放射又は受信する電波の波長に対して0.1波長〜0.2波長、0.6波長〜0.9波長、1.1〜3.0波長、3.4波長、4.0〜4.2波長のいずれかの長さを有することを特徴とする、(1)に記載のホーンアレイアンテナ。
(3)前記第2テーパ部は、放射又は受信する電波の波長に対して0.7波長〜0.8波長、1.2波長〜2.5波長、2.7波長〜3.0波長のいずれかの長さを有することを特徴とする、(2)に記載のホーンアレイアンテナ。
(4)前記第2テーパ部は、放射又は受信する電波の波長に対して0.7波長〜0.8波、1.2波長〜2.0波長、2.2波長〜2.4波長のいずれかの長さを有することを特徴とする、(2)に記載のホーンアレイアンテナ。
(5)前記第2テーパ部は、放射又は受信する電波の波長に対して1.3波長〜1.4波、1.8波長、2.2波長〜2.3波長のいずれかの長さを有することを特徴とする、(2)に記載のホーンアレイアンテナ。
(6)前記複数のホーンアンテナ素子及び前記複数のホーンアンテナ素子に接続される導波管が一体化成型されていることを特徴とする、(1)〜(5)のいずれかに記載のホーンアレイアンテナ。
(7)前記第1テーパ部と前記第2のテーパ部を滑らかに接続する接続部をさらに備えることを特徴とする、(1)に記載のホーンアレイアンテナ。
(8)前記第2テーパ部と放射面との間に誘電体レンズを更に備える、(1)に記載のホーンアレイアンテナ。
11 第2テーパ部
12 ホーンアレイ
13 導波管分配回路
14 板金
15 給電点
16 第3テーパ部
17 接続部
20 誘電体レンズ
Claims (6)
- 導波管に接続される第1の角度を有する第1テーパ部と、
前記第1テーパ部と放射面との間に設けられ、放射又は受信する電波の波長に対して所定の関係を満たす長さを有し、かつ、開口面に対して略垂直の角度を有する第2テーパ部と、
を有するホーンアンテナ素子を複数配列したホーンアレイアンテナ。 - 前記第2テーパ部は、放射又は受信する電波の波長に対して0.1波長〜5.0波長の長さを有することを特徴とする、
請求項1に記載のホーンアレイアンテナ。 - 前記第2テーパ部は、放射又は受信する電波の波長に対して0.1波長〜0.2波長、0.6波長〜0.9波長、1.1〜3.0波長、3.4波長、4.0〜4.2波長のいずれかの長さを有することを特徴とする、
請求項1に記載のホーンアレイアンテナ。 - 前記第2テーパ部は、放射又は受信する電波の波長に対して0.7波長〜0.8波、1.2波長〜2.0波長、2.2波長〜2.4波長のいずれかの長さを有することを特徴とする、
請求項1に記載のホーンアレイアンテナ。 - 前記複数のホーンアンテナ素子及び前記複数のホーンアンテナ素子に接続される導波管が一体化成型されていることを特徴とする、
請求項1に記載のホーンアレイアンテナ。 - 前記第2テーパ部と放射面との間に誘電体レンズを更に備える、
請求項1に記載のホーンアレイアンテナ。
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