JP3480153B2 - 誘電体レンズおよびその製造方法 - Google Patents

誘電体レンズおよびその製造方法

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Publication number
JP3480153B2
JP3480153B2 JP28078195A JP28078195A JP3480153B2 JP 3480153 B2 JP3480153 B2 JP 3480153B2 JP 28078195 A JP28078195 A JP 28078195A JP 28078195 A JP28078195 A JP 28078195A JP 3480153 B2 JP3480153 B2 JP 3480153B2
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JP
Japan
Prior art keywords
dielectric
dielectric lens
lens
sheets
disk
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Expired - Lifetime
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JP28078195A
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English (en)
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JPH09130137A (ja
Inventor
文宣 中村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Murata Manufacturing Co Ltd
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Murata Manufacturing Co Ltd
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Description

【発明の詳細な説明】
【0001】
【発明の属する技術分野】本発明は、マイクロ波、ミリ
波の高周波帯に使用される誘電体レンズおよびその製造
方法に関する。
【0002】
【従来の技術】一般に、この種の誘電体レンズは、厚肉
で、かつ、この肉厚が偏った半球状の形状をしており、
従来、ポリプロピレンなどを材料として射出成型方法に
より製造されている。
【0003】
【発明が解決しようとする課題】しかしながら、従来の
射出成型方法により製造された誘電体レンズは、射出成
型後、その表皮が早く冷却して固化するのに対し、その
内部は遅く冷却して固化するため、いわゆる引け(不均
一、歪み)が生じて所望の形状に成型するのが困難で、
表皮と内部とでは比誘電率に差が生じ、表皮は内部に比
べて、比誘電率が高くなっていた。したがって、従来の
製造方法により製造された誘電体アンテナは、前記比誘
電率の差により電波の反射が生じたり、位相差を生じさ
せて、アンテナ特性が劣化していた。
【0004】そこで、本発明は、表皮と内部の比誘電率
を一定にして、任意の形状に成型でき、かつ、寸法制度
が高く複雑な形状のゾーニングにも対応でき、アンテナ
特性の優れた誘電体レンズおよびその製造方法を提供す
ることを目的とする。
【0005】
【課題を解決するための手段】本発明は、上記目的を達
成するために、下記の手段を採用することを特徴とす
る。
【0006】1.複数個の直径の異なるディスク状誘電
体シートが積層され、前記ディスク状誘電体シートの厚
みが使用周波数のλ/4以下の厚みである誘電体レン
ズ。
【0007】2.前記ディスク状誘電体シートに設けら
れた凹凸に、隣接するディスク状誘電体シートの凸凹が
相互に嵌合することにより、前記ディスク状誘電体シー
トが積層されてなる上記1記載の誘電体レンズ。
【0008】3.前記ディスク状誘電体シートの中央部
に孔を設け、該孔に誘電体棒を挿通することにより、前
記ディスク状誘電体シートが積層されてなる上記1記載
の誘電体レンズ。
【0009】4.内部が階段状の凹部をしているレドー
ムの該内部に、複数個の直径の異なるディスク状誘電体
シートが収納積層されてなる誘電体レンズ。
【0010】
【0011】6.前記誘電体レンズにゾーニングが施さ
れている上記1から上記5のいずれかに記載の誘電体レ
ンズ。
【0012】7.誘電体原布から複数個の直径の異なる
ディスク状の誘電体シートを成形し、前記成形誘電体シ
ートを直径順に積層することを特徴とする誘電体レンズ
の製造方法。
【0013】
【0014】以上のように、本発明の誘電体レンズの製
造方法は、厚肉で、かつ、肉厚が一定でない誘電体レン
ズを、誘電体シートの積層により形成する。この誘電体
シートは、内部組成が均一なので、これを積層して構成
した誘電体レンズも全体に渡って均一となり、従来の樹
脂成形方法で製造した誘電体レンズのように、内部と表
皮に比誘電率の不連続面が生じないので、電波の位相誤
差、反射が生じず、アンテナ特性の優れたものとなる。
また、分割体を集合して形成した誘電体レンズにおいて
も、同様のことがいえる。
【0015】また、本発明の誘電体レンズの製造方法
は、従来の射出成型方法に比べて、短いサイクルでもっ
て寸法制度の優れた厚肉成型品である誘電体レンズを、
またゾーニングされた誘電体レンズを容易に製造するこ
とができる。
【0016】
【発明の実施の形態】以下に、本発明の誘電体レンズの
第1実施例について、図1および図2を参照して説明す
る。図1は本実施例にかかる誘電体レンズの正面図、図
2はその製造方法の説明図である。図1に示す本実施例
の誘電体レンズ10は、表面が階段状の半球形状をして
いる。この誘電体レンズ10の製造方法について図2を
参照して説明する。
【0017】まず、ポリプロピレン、複合誘電体などの
材料で、使用周波数のλ/4以下の厚みtを有する誘電
体原布(図示せず)を用意する。この誘電体原布から、
複数個の直径の異なるディスク状の誘電体シート1a〜
1jをプレス等により成形する。そして、前記成形した
誘電体シート1a〜1jをそれらの中心軸を同一にして
直径順に積層して、図1に示すような半球状の誘電体レ
ンズ10を構成する。なお、積層に当たっては、必要に
より接着剤を使用してもよい。
【0018】本発明に係る誘電体レンズの製造方法は、
プレス成形された誘電体シートを直径順に積層して厚肉
の誘電体レンズを構成するので、いわゆる引けが生じ
ず、したがって寸法精度が優れ、誘電体レンズの内部お
よび外部とも比誘電率が均一になり、アンテナ特性の優
れたものとなる。
【0019】また、誘電体シート1a〜1jの厚みt
は、使用周波数のλ/4以下なので、誘電体レンズ10
の表面は階段状をしているが、電気的には表面が球形状
のものと等価になる。つぎに、本発明の誘電体レンズの
第2実施例について、図3および図4を参照して説明す
る。図3は本実施例の誘電体レンズ20の縦断面図を示
し、図4は本実施例の誘電体レンズ20の製造方法を示
すものである。
【0020】図4において、複数個の直径の異なるディ
スク状の誘電体シート2a〜2jは、厚みtがλ/4以
下で、個別に金型にて樹脂成形される。上層誘電体シー
ト2aはその中心部の下側に凹部aを有し、中層誘電体
シート2b〜2iはその中心部の上側に凸部bを、中心
部の下側に凹部aをそれぞれ有し、下層誘電体シート2
jは上側に凸部bを有する。これらの上層誘電体シート
2a、中層誘電体シート2b〜2iおよび下層誘電体シ
ート2jは、それぞれ直径順に並べられ、隣接(上下)
の凹凸に相互嵌合して積層され、図3に示すような半球
状の誘電体レンズ20が構成される。
【0021】本実施例は、各層誘電体シートに凹凸が設
けられており、この凹凸の嵌合により隣接(上下)の誘
電体シートが積層されるので、第1実施例の作用効果に
加えるに、誘電体レンズをより精度よく形成することが
できる。
【0022】本実施例においては、隣接(上下)の誘電
体シート2a〜2jに隣接同志が相互嵌合する凹凸を形
成したが、この凹凸はリング状の突起と溝であってもよ
い。つぎに、図5を参照して本発明の誘電体レンズの第
3実施例について説明する。本実施例の誘電体レンズ3
0は、各誘電体シート3a〜3jの中央部に貫通孔4a
をそれぞれ設け、これらの誘電体シート3a〜3jを積
層するときに、各誘電体シート3a〜3jの貫通孔4a
を誘電体棒4に挿入したものである。
【0023】本実施例は、その誘電体シート3a〜3j
を第1実施例と同様に、広い幅の誘電体シートからプレ
ス成形することができ、工程が簡略化される。そして、
各誘電体シート3a〜3jは、誘電体棒4に挿通されて
精度良く配列されることになる。つぎに、本発明の誘電
体レンズの第4実施例について図6および図7を参照し
て説明する。図6は本実施例の誘電体レンズ40の縦断
面図を示す。図7は本実施例の誘電体レンズの製造方法
を示し、Aはレドームの断面図、Bは各誘電体シートの
断面図である。
【0024】図7において、5は後述の誘電体シートと
同じ誘電率を有する誘電体の樹脂から成形されるレドー
ムである。このレドーム5は、外形が滑らかで略半球状
をしており、内部が階段状の凹部5Aに形成される。こ
の凹部5Aは、換言すれば、個別のディスク状空間5a
〜5fの集合よりなるものと理解してもよい。一方、6
は複数個の直径の異なるディスク状誘電体シート6a〜
6fで、厚みtが使用周波数のλ/4以上である。これ
らのディスク状誘電体シート6a〜6fは、レドーム5
のディスク状空間5a〜5fにそれぞれ収納積層され
て、図6に示す形状の誘電体レンズ40となる。
【0025】本実施例は、母材となる誘電体原布(図示
せず)の厚みtが使用周波数のλ/4以上の場合に、特
に採用されるのものである。即ち、誘電体レンズ40を
構成する各誘電体シート6a〜6fの厚みtが使用周波
数のλ/4以上になると誘電体レンズ40の外形の段差
が影響して、誘電体レンズとしての良好な特性が得られ
なくなる。この段差の影響を、誘電体シート6a〜6f
と同一材料からなり、表面の滑らかなレドーム5を使用
して、このレドーム5の中に段差を有する誘電体シート
6a〜6fを収納積層することにより、誘電体シート6
a〜6fの段差の影響をなくすことができる。前記レド
ーム5は金型射出成型により作られるが、薄肉のため、
表皮と内部の物理的歪み、電気的特性歪みは生じない。
【0026】つぎに、本発明の誘電体レンズの第5実施
例について図8を参照して説明する。同図Aは本実施例
の誘電体レンズの斜視図を示し、同図Bは同図Aに示す
誘電体レンズから抽出した一つの分割体の斜視図を示
す。図8Aに示す誘電体レンズ50は、同図Bに示す分
割体7aの集合よりなる。この分割体7aは、誘電体レ
ンズ50の原形を有する略半球状の誘電体7をその軸線
cを通る平面で多分割して形成された形状をしている。
この複数個の分割体7aは元の分割前の形状に集合して
組み立てられて、半球状の誘電体レンズ50が形成され
る。
【0027】本実施例において、分割体7aの厚みは表
皮と内部に歪みが生じない適宜の厚みに選定される。本
実施例によれば、分割体7aを一つの金型で形成できる
ため、成型のコストが低減することになる。各分割体7
aは、組み立てに当たっては、必要により、接着剤によ
り接合される。
【0028】つぎに、本発明の誘電体レンズの第6実施
例、第7実施例および第8実施例について、それぞれ図
9、図10および図11を参照して説明する。図9に示
す誘電体レンズ60は、図1に示す誘電体レンズ10に
ゾーニング加工を施して、円筒状の切り欠き空間部8a
を設けたものである。同様に、図10に示す誘電体レン
ズ70は、図1に示す誘電体レンズ10にゾーニング加
工を施して、階段状の切り欠き空間部8bを設けたもの
である。
【0029】また、図11は図6に示す誘電体レンズ4
0にゾーニング加工を施して、図9と同様に、円筒状の
切り欠き空間部8cを設けたものである。
【0030】これらの切り欠き空間部8a、8b、8c
のゾーニング加工は、誘電体シート1a〜1j、5a〜
5fを、誘電体原布から個別に打ち抜き成形するときに
所定のものだけに同時に実施するものである。
【0031】このゾーニング加工により、誘電体レンズ
の特性をほぼ維持して、その重量を軽減することができ
る。
【0032】
【発明の効果】本発明の誘電体レンズの製造方法は、成
型された誘電体シートを積層することにより、厚肉で、
かつ、肉厚の均一でない誘電体レンズを形成するで、従
来の射出成型方法に比べて、樹脂注型後の長時間冷却を
必要とせず、成型時間が大幅に短縮され、また、寸法制
度の優れた厚肉成型品である誘電体レンズを、またゾー
ニングされた誘電体レンズを容易に製造することができ
るので、コスト低減を図ることができる。また、本発明
の製造方法により製造された誘電体レンズは、内部組成
の均一な誘電体シートの積層あるいは分割体の集合によ
り形成されるので、表面および内部とも組成が均一とな
って、比誘電率の不連続面が生じることがなく、電波の
位相誤差、反射が生じず、アンテナ特性の優れたものと
なる。
【図面の簡単な説明】
【図1】 本発明の誘電体レンズの第1実施例の正面図
【図2】 図1に示す誘電体レンズの製造方法の説明図
【図3】 本発明の誘電体レンズの第2実施例の断面図
【図4】 図3に示す誘電体レンズの製造方法の説明図
【図5】 本発明の誘電体レンズの第3実施例の断面図
【図6】 本発明の誘電体レンズの第4実施例の断面図
【図7】 図6に示す誘電体レンズの製造方法を示し、
Aはレドームの断面図、Bは各誘電体シートの断面図
【図8】 本発明の誘電体レンズの第5実施例を示し、
Aは誘電体レンズの斜視図、Bは誘電体レンズを構成す
る分割体の斜視図
【図9】 本発明のゾーニング加工を施した誘電体レン
ズの第6実施例の断面図
【図10】 本発明のゾーニング加工を施した誘電体レ
ンズの第7実施例の断面図
【図11】 本発明のゾーニング加工を施した誘電体レ
ンズの第8実施例の断面図
【符号の説明】
1a〜1j、2a〜2j、3a〜3j、6a〜6f
誘電体シート 4 誘電体棒 4a 孔 5 レドーム 5A 階段状の凹部 5a〜5b ディスク状空間 6 各誘電体シート 7 誘電体 7a 分割体 8a、8b、8c 切り欠き空間部 10、20、30、40、50、60、70、80
誘電体レンズ a 凹部 b 凸部
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平3−80704(JP,A) 特開 平9−191212(JP,A) 特開 平9−199936(JP,A) 特開 平9−181523(JP,A) 特開 平7−79114(JP,A) 特開 昭50−90272(JP,A) 特開 昭62−117204(JP,A) 特開 昭53−136852(JP,A) 特開 昭62−258505(JP,A) 実開 平3−38908(JP,U) 特公 昭25−3574(JP,B1) (58)調査した分野(Int.Cl.7,DB名) H01Q 15/08

Claims (6)

    (57)【特許請求の範囲】
  1. 【請求項1】 複数個の直径の異なるディスク状誘電体
    シートが積層され、前記ディスク状誘電体シートの厚み
    が使用周波数のλ/4以下の厚みである誘電体レンズ。
  2. 【請求項2】 前記ディスク状誘電体シートに設けられ
    た凹凸に、隣接するディスク状誘電体シートの凸凹が相
    互に嵌合することにより、前記ディスク状誘電体シート
    が積層されてなる請求項1記載の誘電体レンズ。
  3. 【請求項3】 前記ディスク状誘電体シートの中央部に
    孔を設け、該孔に誘電体棒を挿通することにより、前記
    ディスク状誘電体シートが積層されてなる請求項1記載
    の誘電体レンズ。
  4. 【請求項4】 内部が階段状の凹部をしているレドーム
    の該内部に、複数個の直径の異なるディスク状誘電体シ
    ートが収納積層されてなる誘電体レンズ。
  5. 【請求項5】 前記誘電体レンズにゾーニングが施され
    ている請求項1から請求項4のいずれかに記載の誘電体
    レンズ。
  6. 【請求項6】 誘電体原布から複数個の直径の異なるデ
    ィスク状の誘電体シートを使用周波数のλ/4以下の厚
    さで成形し、前記ディスク状の誘電体シートを直径順に
    積層することを特徴とする誘電体レンズの製造方法。
JP28078195A 1995-10-27 1995-10-27 誘電体レンズおよびその製造方法 Expired - Lifetime JP3480153B2 (ja)

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JP3480153B2 true JP3480153B2 (ja) 2003-12-15

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Cited By (159)

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