JP5789492B2 - マイクロ波アンテナ - Google Patents
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しかしながら、図11のダイポールアンテナは、360度の指向性が得られるが、利得が低く、不要な後方までの感度がある。
また、図12のオムニアンテナは、複数のアンテナ素子4を配置し、その方向を変えたりするため、給電部や機構が複雑になり、また全体の形状も大きくなるという問題がある。
請求項2の発明は、上記アンテナ開口が形成された本体の側面に、上記誘電体のアンテナ開口端側縁部から延出させた延出部を設けると共に、上記誘電体の上記縁部の外側角を曲面に形成したことを特徴とする。
請求項3の発明は、上記誘電体開口を一方向に長い形状とし、この誘電体開口の長手方向に垂直な方向において、上記誘電体の厚さを略同一とし、上記誘電体のアンテナ開口端側縁部の外側角を曲面に形成する構成としたことを特徴とする。この場合、誘電体開口の長手方向において、上記誘電体を凸レンズ形に形成する構成としてもよい。
図4は、第1実施例の電界強度分布及び指向性であり、第1実施例では、図4(A)に示されるように、電界強度分布がアンテナ前方に略半円状に広がることになり、図4(B)に示されるように、略180度の範囲で一定の強度が得られている。
図6は、本体10の前面に、平板状の誘電体19を置いた場合の電界強度分布及び指向性であり、誘電体19の厚みが電波の1/2波長付近の場合は、図6(A)のように、誘電体の影響はほとんどなく、誘電体がない場合に比べて、電界強度分布及び指向性[図6(B)]が若干変化する程度である。
11…伝送線路−導波管変換部、
12,22a,22b…アンテナ開口、
14,24…誘電体、
14e,24e…縁部、
14h,24h…延出部、
15,25,26…誘電体開口、
15a,25a,26a…薄肉表面部、
Fa…誘電体開口の長手方向、
Fb…誘電体開口の短手方向。
Claims (3)
- アンテナ開口の前面を覆うように略同一の厚さの誘電体を設けると共に、
この誘電体の上記アンテナ開口の中央部の位置に、内側に段差を持って形成された開口又は内側に段差を持って形成されかつ薄肉表面部を付けた開口を設け、広角度の指向性が得られるようにしたマイクロ波アンテナ。 - 上記アンテナ開口が形成された本体の側面に、上記誘電体のアンテナ開口端側縁部から延出させた延出部を設けると共に、上記誘電体の上記縁部の外側角を曲面に形成したことを特徴とする請求項1記載のマイクロ波アンテナ。
- 上記誘電体開口を一方向に長い形状とし、
この誘電体開口の長手方向に垂直な方向において、上記誘電体の厚さを略同一とし、上記誘電体のアンテナ開口端側縁部の外側角を曲面に形成する構成としたことを特徴とする請求項1又は2記載のマイクロ波アンテナ。
Priority Applications (1)
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JP2011252517A JP5789492B2 (ja) | 2011-11-18 | 2011-11-18 | マイクロ波アンテナ |
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JP2011252517A JP5789492B2 (ja) | 2011-11-18 | 2011-11-18 | マイクロ波アンテナ |
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JP2013110503A JP2013110503A (ja) | 2013-06-06 |
JP5789492B2 true JP5789492B2 (ja) | 2015-10-07 |
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