JP4943922B2 - antenna - Google Patents
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- JP4943922B2 JP4943922B2 JP2007104513A JP2007104513A JP4943922B2 JP 4943922 B2 JP4943922 B2 JP 4943922B2 JP 2007104513 A JP2007104513 A JP 2007104513A JP 2007104513 A JP2007104513 A JP 2007104513A JP 4943922 B2 JP4943922 B2 JP 4943922B2
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- 238000010586 diagram Methods 0.000 description 7
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
Abstract
Description
本発明は、アンテナに係り、特に、長方形状の金属板と、前記金属板の長手方向に沿って設けられた第１スリットと、前記第１スリットの中央から前記金属板の第１端部まで前記金属板の短手方向に沿って延在して設けられた第２スリットとを設けたアンテナに関するものである。 The present invention relates to an antenna, and in particular, a rectangular metal plate, a first slit provided along a longitudinal direction of the metal plate, and a center of the first slit to a first end of the metal plate. The present invention relates to an antenna provided with a second slit provided so as to extend along the short direction of the metal plate.
上述したアンテナとして、図１に示されたアンテナが提案されている（特許文献１、非特許文献１、２）。同図に示すように、アンテナは、長方形状の金属板１０から成っている。この金属板１０には、第１スリットＳＬ１と、第２スリットＳＬ２とが設けられている。第１スリットＳＬ１は、金属板１０の長手方向Ｙ１に沿って設けられている。第２スリットＳＬ２は、第１スリットＳＬ１の中央から金属板１０の第１端部Ｔ１まで短手方向Ｙ２に沿って延在して設けられている。アンテナは、第１端部Ｔ１と第１スリットＳＬ１との距離Ｗ２を金属板１０の第１端部Ｔ１と対向する第２端部Ｔ２と第２スリットＳＬ２との距離よりも大きくして設けられている。 As the antenna described above, the antenna shown in FIG. 1 has been proposed (Patent Document 1, Non-Patent Documents 1 and 2). As shown in the figure, the antenna is composed of a rectangular metal plate 10. The metal plate 10 is provided with a first slit SL1 and a second slit SL2. The first slit SL1 is provided along the longitudinal direction Y1 of the metal plate 10. The second slit SL2 extends from the center of the first slit SL1 to the first end T1 of the metal plate 10 along the short direction Y2. The antenna is provided such that the distance W2 between the first end T1 and the first slit SL1 is larger than the distance between the second end T2 facing the first end T1 of the metal plate 10 and the second slit SL2. ing.
本発明者らは、金属板１０の長手方向Ｙ１の距離ｌ＝８８ｍｍとして、特許文献１、非特許文献２に記載されているアンテナ寸法比と同じアンテナを、インピーダンス７５Ω、５０Ωについてそれぞれシミュレーションして、そのアンテナの電圧定在波比（以下ＶＳＷＲ）−周波数特性を求めた。結果を図２６に示す。 The present inventors simulated the same antenna size ratio described in Patent Document 1 and Non-Patent Document 2 with respect to impedances of 75Ω and 50Ω, assuming that the distance l in the longitudinal direction Y1 of the metal plate 10 is 88 mm. The voltage standing wave ratio (hereinafter referred to as VSWR) -frequency characteristic of the antenna was obtained. The results are shown in FIG.
なお、アンテナ寸法は、距離ｌ＝８８ｍｍ、距離Ｗ２＝３０ｍｍ、第１スリットＳＬ１、第２スリットＳＬ２のスリット幅ｄ＝２．６ｍｍ、距離Ｗ１＝２．６ｍｍ、第１スリットＳＬ１の端部と金属板１０の長手方向Ｙ１に対向する一対の端部の各々との距離ｅ＝２４ｍｍとした。同図に示すように、このアンテナは７５Ω系においては、ＶＳＷＲ−周波数特性が２点で極小点を持つ、即ち２つの共振周波数を持つため広い範囲でＶＳＷＲを小さくすることができ、ＶＳＷＲ＜２の比帯域を７５％と広帯域にすることができる。
しかしながら、上述したアンテナは、広帯域で使用でき、しかも平面で構成される利点をもつものの、エレメント面積が大きくなる事が欠点である、という第１の課題があった。 However, although the antenna described above can be used in a wide band and has an advantage of being configured in a plane, there is a first problem that an element area is large.
また、図２６に示すように、このアンテナは５０Ω系においては、ＶＳＷＲ−周波数特性が２つの共振周波数を持っているが、全体的にＶＳＷＲが大きく、ＶＳＷＲ＜２の比帯域は２０％未満となり、広い広帯域を得ることができない、という第２の課題があった。 In addition, as shown in FIG. 26, in the 50Ω system, this antenna has two resonance frequencies in the VSWR-frequency characteristics, but the overall VSWR is large and the ratio band of VSWR <2 is less than 20%. There was a second problem that a wide broadband could not be obtained.
そこで、本発明は、上記のような問題点に着目し、広帯域を保ちつつ面積を小さくしたアンテナを提供することを第１の課題とする。 In view of the above, the first object of the present invention is to provide an antenna having a small area while maintaining a wide band.
また、本発明は、比帯域２０％以上の広帯域を持つインピーダンス５０Ωのアンテナを提供することを第２の課題とする。 A second object of the present invention is to provide an antenna with an impedance of 50Ω having a wide band with a specific band of 20% or more.
本発明者は、広帯域を保ちつつ面積を小さくすべく検討を重ねた結果、金属板の第１端部側の角部にはほとんど電流が流れていないことを見い出し、本発明を完成するに至った。 As a result of repeated studies to reduce the area while maintaining a wide band, the present inventor has found that almost no current flows in the corner portion on the first end side of the metal plate, and has completed the present invention. It was.
即ち、請求項１記載の発明は、長方形状の金属板と、前記金属板の長手方向に沿って設けられた第１スリットと、前記第１スリットの中央から前記金属板の第１端部まで前記金属板の短手方向に沿って延在して設けられた第２スリットとを設けて、２つの共振周波数を持つように、前記第１端部と前記第１スリットとの距離を前記金属板の前記第１端部と対向する第２端部と、前記第１スリットとの距離よりも大きくして設けたアンテナにおいて、前記金属板の前記第１端部側において前記長手方向に対向する一対の角部を切り欠いた一対の第１切欠部を設け、前記一対の第１切欠部が各々、四角形状になるように切り欠かれていることを特徴とするアンテナに存する。 That is, the invention according to claim 1 is a rectangular metal plate, a first slit provided along the longitudinal direction of the metal plate, and from the center of the first slit to the first end of the metal plate. A second slit provided along the short direction of the metal plate is provided, and the distance between the first end and the first slit is set so as to have two resonance frequencies. In an antenna provided with a distance greater than a distance between the second end of the plate facing the first end and the first slit, the antenna is opposed to the longitudinal direction on the first end of the metal plate. A pair of first cutout portions provided by cutting out a pair of corner portions are provided, and the pair of first cutout portions are cut out so as to have a quadrangular shape .
請求項２記載の発明は、長方形状の金属板と、前記金属板の長手方向に沿って設けられた第１スリットと、前記第１スリットの中央から前記金属板の第１端部まで前記金属板の短手方向に沿って延在して設けられた第２スリットとを設けて、２つの共振周波数を持つように、前記第１端部と前記第１スリットとの距離を前記金属板の前記第１端部と対向する第２端部と、前記第１スリットとの距離よりも大きくして設け、ガラス上に搭載されたアンテナにおいて、前記金属板の前記第１端部側において前記長手方向に対向する一対の角部を切り欠いた一対の第１切欠部を設け、前記一対の第１切欠部が各々、前記金属板の長手方向側の端部から前記第２スリットの縁部に亘って前記第２スリットに近づくに従って前記第２端部から離れるように前記金属板上に設けた第１切欠線と該第１切欠線の前記第２スリット側の端部から前記第１端部に亘って前記第２スリットに沿って前記金属板上に設けられた第２切欠線との両切欠線に沿って切り欠いて設けられていることを特徴とするアンテナに存する。 According to a second aspect of the present invention, there is provided a rectangular metal plate, a first slit provided along a longitudinal direction of the metal plate, and the metal from a center of the first slit to a first end of the metal plate. A second slit extending along the short direction of the plate is provided, and the distance between the first end and the first slit is set so as to have two resonance frequencies. In the antenna mounted on the glass and provided larger than the distance between the second end facing the first end and the first slit, the long side is formed on the first end side of the metal plate. A pair of first cutouts are formed by cutting out a pair of corners facing each other in the direction, and each of the pair of first cutouts extends from an end of the metal plate in the longitudinal direction to an edge of the second slit. As it approaches the second slit, it moves away from the second end. Provided on the metal plate along the second slit across the first end of the first notch line and the second slit end of the first notch line provided on the metal plate The antenna is characterized by being cut out along both cut lines with the second cut line.
請求項３記載の発明は、前記金属板の前記第２スリットを中心とした前記長手方向の両側に設けられた前記第１切欠線、前記第１切欠線を前記第２スリットまで延長した第１延長線、前記第２スリット、前記第１スリット、前記第２スリットの短手方向に沿った縁部を前記第２端部まで延長した第２延長線、前記第２端部、前記金属板の前記長手方向側の端部に囲まれた領域を、少なくとも該領域の縁部を残して切り欠いた一対の第２切欠部を設けたことを特徴とする請求項２に記載のアンテナに存する。 According to a third aspect of the present invention, the first notch line provided on both sides in the longitudinal direction centered on the second slit of the metal plate, the first notch line extending the first notch line to the second slit. An extension line , the second slit, the first slit, a second extension line that extends an edge along the short direction of the second slit to the second end, the second end, and the metal plate 3. The antenna according to claim 2 , wherein a pair of second cutout portions are provided in which a region surrounded by the end portion on the longitudinal direction side is cut out at least leaving an edge portion of the region.
以上説明したように請求項１記載の発明によれば、金属板の第１端部側において長手方向に対向する一対の角部を切り欠いた四角形状の切欠部を設けても２つの共振周波数を持たせることができる。このため、広帯域特性を保ちつつ切欠分、面積を小さくすることができた。 As described above, according to the first aspect of the present invention, two resonance frequencies can be obtained even if a rectangular notch is formed by notching a pair of corners facing each other in the longitudinal direction on the first end side of the metal plate. Can be given. For this reason, it was possible to reduce the notch and the area while maintaining the broadband characteristics.
請求項２記載の発明によれば、一対の第１切欠部が各々、長手方向側の端部から第２スリットの縁部に亘って第２スリットに近づくに従って第２端部から離れるように設けた第１切欠線と該第１切欠線の第２スリット側の端部から第２端部に亘って第２スリットに沿って設けられた第２切欠線との両切欠線に沿って切り欠いて設けることにより、広帯域特性を保ちつつ切欠分、面積を小さくすることができた。 According to the second aspect of the present invention, the pair of first cutout portions are provided so as to be separated from the second end portion as they approach the second slit from the longitudinal end portion to the edge of the second slit. The first notch line and the second notch line provided along the second slit from the end on the second slit side to the second end of the first notch line are cut along both notch lines. Thus, the notch and the area can be reduced while maintaining the broadband characteristics.
請求項３記載の発明によれば、少なくとも第１切欠線、第１延長線、第２スリット、第１スリット、第２延長線、第２端部、長手方向側の端部の縁部を残して切り欠いた一対の第２切欠部を設けることにより、広帯域特性を保ちつつ切欠分、面積を小さくすることができた。 According to the invention described in claim 3, at least the first notch line, the first extension line, the second slit, the first slit, the second extension line, the second end , and the edge of the longitudinal end are left. By providing the pair of second cutout portions that were cut out, the area of the cutout could be reduced while maintaining broadband characteristics.
第１参考例
以下、本発明の第１参考例を図面に基づいて説明する。図１は、第１参考例におけるアンテナを示す図である。同図に示すように、アンテナは、長方形状の金属板１０から成っている。この金属板１０には、第１スリットＳＬ１と、第２スリットＳＬ２とが設けられている。第１スリットＳＬ１は、金属板１０の長手方向Ｙ１に沿って設けられている。第２スリットＳＬ２は、第１スリットＳＬ１の中央から金属板１０の第１端部Ｔ１まで短手方向Ｙ２に沿って延在して設けられている。また、２０は、給電器である。この給電器２０は、第１端部Ｔ１の第２スリットＳＬ２を挟んだ長手方向Ｙ１の一方側と他方側間に給電を行っている。
First Reference Example Hereinafter, a first reference example of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating an antenna in a first reference example . As shown in the figure, the antenna is composed of a rectangular metal plate 10. The metal plate 10 is provided with a first slit SL1 and a second slit SL2. The first slit SL1 is provided along the longitudinal direction Y1 of the metal plate 10. The second slit SL2 extends from the center of the first slit SL1 to the first end T1 of the metal plate 10 along the short direction Y2. Reference numeral 20 denotes a power feeder. The power feeder 20 feeds power between one side and the other side in the longitudinal direction Y1 across the second slit SL2 of the first end T1.
本発明者は、上記第１端部Ｔ１と第１スリットＳＬ１との距離Ｗ２が異なる複数のアンテナを作製して、そのアンテナのＶＳＷＲ＜２となる比帯域と、中心周波数ｆｃとを計測した。結果を図２に示す。なお、金属板１０の長手方向Ｙ１の距離ｌを８８ｍｍ、第２端部Ｔ２と第１スリットＳＬ１との距離Ｗ１を４ｍｍ、第１及び第２スリットＳＬ１、ＳＬ２の幅ｄを２ｍｍ、第１スリットＳＬ１の端部と金属板１０の長手方向Ｙ１に対向する一対の端部の各々との距離ｅを２ｍｍとし、アンテナインピーダンスを５０Ωとしている。また、比帯域は、下記の式（１）で求めることができる。 The inventor manufactured a plurality of antennas having different distances W2 between the first end portion T1 and the first slit SL1, and measured a ratio band and a center frequency fc where VSWR <2 of the antennas. The results are shown in FIG. The distance l in the longitudinal direction Y1 of the metal plate 10 is 88 mm, the distance W1 between the second end T2 and the first slit SL1 is 4 mm, the width d of the first and second slits SL1 and SL2 is 2 mm, and the first slit. The distance e between the end of SL1 and each of the pair of ends facing the longitudinal direction Y1 of the metal plate 10 is 2 mm, and the antenna impedance is 50Ω. Further, the specific band can be obtained by the following equation (1).
（ｆmax−ｆmin）／ｆｃ …（１）
（ｆmax：ＶＳＷＲ＜２となる周波数の最大値、ｆmin：ＶＳＷＲ＜２になる周波数の最大値、ｆｃ：ＶＳＷＲ＜２となる周波数域の中心）
(Fmax−fmin) / fc (1)
(Fmax: maximum value of frequency where VSWR <2; fmin: maximum value of frequency where VSWR <2; fc: center of frequency range where VSWR <2)
図２に示すように、距離Ｗ２の変化に対して比帯域は急激に変化し、２８ｍｍ＜Ｗ２＜５５ｍｍ付近にピークをもち、最大で５０％以上が得られることが分かった。よって、２８ｍｍ＜Ｗ２＜４４ｍｍとすれば、２３％以上の比帯域を得ることができる。 As shown in FIG. 2, it was found that the ratio band rapidly changed with respect to the change in the distance W2, had a peak near 28 mm <W2 <55 mm, and a maximum of 50% or more was obtained. Therefore, if 28 mm <W2 <44 mm, a ratio band of 23% or more can be obtained.
また、本発明者は、距離ｅが異なる複数のアンテナを作製して、そのアンテナのＶＳＷＲ＜２となる比帯域と、中心周波数ｆｃとを計測した。結果を図３に示す。なお、距離ｌ＝８８ｍｍ、距離Ｗ１＝４ｍｍ、距離Ｗ２＝３２ｍｍ、幅ｄ＝２ｍｍとし、アンテナインピーダンスを５０Ωとしている。図３に示すように、距離ｅの変化に対しても比帯域は急激に変化し３２ｍｍ＜距離ｗ２＜４０ｍｍ、距離ｅ＜１６の範囲で２０％以上の比帯域が得られることがわかった。 In addition, the present inventor manufactured a plurality of antennas having different distances e, and measured a ratio band where the antenna VSWR <2 and a center frequency fc. The results are shown in FIG. Note that the distance l = 88 mm, the distance W1 = 4 mm, the distance W2 = 32 mm, the width d = 2 mm, and the antenna impedance is 50Ω. As shown in FIG. 3, it was found that the specific band rapidly changed with respect to the change of the distance e, and a specific band of 20% or more was obtained in the range of 32 mm <distance w2 <40 mm and the distance e <16.
また、本発明者は、幅ｄが異なる複数のアンテナを作製して、そのアンテナのＶＳＷＲ＜２となる比帯域と、中心周波数ｆｃとを計測した。結果を図４に示す。なお、距離ｌ＝８８ｍｍ、距離Ｗ１＝４ｍｍ、距離Ｗ２＝３２ｍｍ、距離ｅ＝２ｍｍとし、アンテナインピーダンスを５０Ωとしている。図４に示すように、幅ｄが変化に対しても比帯域はほとんど変化しないことが分かった。 In addition, the present inventor manufactured a plurality of antennas having different widths d, and measured the ratio band where the antenna VSWR <2 and the center frequency fc. The results are shown in FIG. Note that the distance l = 88 mm, the distance W1 = 4 mm, the distance W2 = 32 mm, the distance e = 2 mm, and the antenna impedance is 50Ω. As shown in FIG. 4, it was found that the ratio band hardly changed even when the width d changed.
また、本発明者は、距離Ｗ１が異なる複数のアンテナを作製して、そのアンテナのＶＳＷＲ＜２となる比帯域と、中心周波数ｆｃとを計測した。結果を図５に示す。なお、距離ｌ＝８８ｍｍ、距離Ｗ２＝３２ｍｍ、距離ｅ＝２ｍｍ、幅ｄ＝２ｍｍとし、５０Ωのインピーダンスで給電している。図５に示すように、距離Ｗ１による比帯域の変化は若干あるものの距離Ｗ２、ｅに比べると小さいことが分かった。 In addition, the present inventor manufactured a plurality of antennas having different distances W1, and measured the ratio band and the center frequency fc where VSWR <2 of the antennas. The results are shown in FIG. The distance l = 88 mm, the distance W2 = 32 mm, the distance e = 2 mm, the width d = 2 mm, and power is supplied with an impedance of 50Ω. As shown in FIG. 5, it was found that although the change in the ratio band due to the distance W1 is slightly, it is smaller than the distances W2 and e.
そこで、本発明者は、比帯域の特に影響の大きい距離Ｗ２、距離ｅが異なる複数のアンテナを作製して、そのアンテナのＶＳＷＲ＜２となる比帯域と、中心周波数ｆｃとを計測した。結果を図６に示す。なお、距離ｌ＝８８ｍｍ、距離Ｗ１＝４ｍｍ、幅ｄ＝２ｍｍとし、５０Ωのインピーダンスで給電している。図６に示すように、３２ｍｍ＜距離Ｗ２＜４０ｍｍ、距離ｅ＜１６ｍｍのとき、比帯域が２０％を超えることが分かった。また、距離ｅを大きくすると、距離Ｗ２も大きくなり、アンテナが大型化することが分かった。 Therefore, the present inventor manufactured a plurality of antennas having different distances W2 and e, which have a particularly large influence on the specific band, and measured the specific band where VSWR <2 and the center frequency fc of the antenna. The results are shown in FIG. Note that the distance l = 88 mm, the distance W1 = 4 mm, the width d = 2 mm, and power is supplied with an impedance of 50Ω. As shown in FIG. 6, it was found that the specific band exceeded 20% when 32 mm <distance W2 <40 mm and distance e <16 mm. Further, it was found that when the distance e is increased, the distance W2 is also increased, and the antenna is increased in size.
次に、本発明者は、距離Ｗ１、Ｗ２が異なる複数のアンテナを作製して、そのアンテナのＶＳＷＲ＜２となる比帯域と、中心周波数ｆｃとを計測した。結果を図７〜図９に示す。なお、図７においては、距離ｌ＝８８ｍｍ、距離ｅ＝２ｍｍ、幅ｄ＝２ｍｍとし、図８においては、距離ｌ＝８８ｍｍ、距離ｅ＝８ｍｍ、幅ｄ＝２ｍｍとし、図９においては、距離ｌ＝８８ｍｍ、距離ｅ＝１６ｍｍ、幅ｄ＝２ｍｍとしている。図７〜図９に示すように、２８ｍｍ＜距離Ｗ２＜４８ｍｍ、距離Ｗ１＜１６ｍｍにすると比帯域２０％を超えることが分かった。また、Ｗ１＝１６ｍｍでも比帯域４０％を超える場合もあるが、距離Ｗ１の増大によりアンテナが大型化してしまうことが分かった。 Next, the present inventor manufactured a plurality of antennas having different distances W1 and W2, and measured the ratio band of the antennas where VSWR <2 and the center frequency fc. The results are shown in FIGS. In FIG. 7, the distance l = 88 mm, the distance e = 2 mm, and the width d = 2 mm. In FIG. 8, the distance l = 88 mm, the distance e = 8 mm, and the width d = 2 mm. In FIG. l = 88 mm, distance e = 16 mm, and width d = 2 mm. As shown in FIGS. 7 to 9, it was found that when 28 mm <distance W2 <48 mm and distance W1 <16 mm, the specific bandwidth exceeds 20%. Further, even when W1 = 16 mm, the specific band may exceed 40%, but it has been found that the antenna becomes larger due to the increase in the distance W1.
第２参考例
次に、本発明者らは、距離ｌ＝８８ｍｍ、距離Ｗ２＝３２ｍｍ、距離Ｗ１＝４ｍｍ、幅ｄ＝２ｍｍ、距離ｅ＝２ｍｍのアンテナを作製してＶＳＷＲ−周波数特性の実測値、計算値を測定した。結果を図１０に示す。同図に示すように、実測値、計算値とも良く一致した。また、測定結果で１．１６〜２．０３ＧＨｚの広い範囲に渡り、ＶＳＷＲ＜２となった。比帯域を計算すると５４％となっている。
The second reference example Next, we distance l = 88mm, the distance W2 = 32 mm, the distance W1 = 4 mm, a width d = 2mm, the distance e = to prepare a 2mm antenna VSWR- measured frequency characteristic Values and calculated values were measured. The results are shown in FIG. As shown in the figure, the measured values and the calculated values agreed well. In addition, the measurement result was VSWR <2 over a wide range of 1.16 to 2.03 GHz. The specific bandwidth is calculated to be 54%.
次に、本発明者らは、上記距離ｌ＝８８ｍｍ、距離Ｗ２＝３２ｍｍ、距離Ｗ１＝４ｍｍ、幅ｄ＝２ｍｍ、距離ｅ＝２ｍｍのアンテナを作製して、共振周波数２ＧＨｚ、１．３５ＧＨｚのそれぞれにおける金属板１０の各部に流れる電流の流れ、及び、強さを計測した。結果を、図１１に示す。図１１（Ａ）は２ＧＨｚのときの電流の流れ及び強さを示す図であり、図１１（Ｂ）は１．３５ＧＨｚのときの電流の流れ及び強さを示す図である。 Next, the present inventors manufactured antennas having the above-mentioned distance l = 88 mm, distance W2 = 32 mm, distance W1 = 4 mm, width d = 2 mm, and distance e = 2 mm, and had resonance frequencies of 2 GHz and 1.35 GHz, respectively. The current flow and the strength flowing through each part of the metal plate 10 were measured. The results are shown in FIG. FIG. 11A is a diagram showing the current flow and strength at 2 GHz, and FIG. 11B is a diagram showing the current flow and strength at 1.35 GHz.
図１１中、矢印が電流の向きを表し、背景色の濃淡が電流密度の強さ（濃いと弱く、薄いと強い）を表している。同図に示すように、金属板１０の第１端部Ｔ１側の長手方向Ｙ１に対向する一対の角部にはほとんど電流が流れていないことが分かった。 In FIG. 11, the arrow indicates the direction of the current, and the density of the background color indicates the strength of the current density (weak when dark and strong when thin). As shown in the figure, it has been found that almost no current flows through the pair of corners facing the longitudinal direction Y1 on the first end T1 side of the metal plate 10.
そこで、本発明者らは、図１２に示すように、上記距離ｌ＝８８ｍｍ、距離Ｗ２＝３２ｍｍ、距離Ｗ１＝４ｍｍ、幅ｄ＝２ｍｍ、距離ｅ＝２ｍｍのアンテナに、距離Ｗ３＝２ｍｍとなるように金属板の第１端部側の角部を三角形状に切り欠いた切欠部１１を設けたアンテナを作成し、ＶＳＷＲ−周波数特性の実測値、計算値を測定した。同図に示すように、切欠部１１を設けても２つの共振周波数を持つ広帯域特性が得られることが分かった。よって、計算値においては、１．４７ＧＨｚ〜２．２７ＧＨｚの帯域でＶＳＷＲ＜２となり、比帯域も４３％と広帯域にできることが分かった。 Therefore, as shown in FIG. 12, the present inventors have a distance W3 = 2 mm in the antenna having the distance l = 88 mm, the distance W2 = 32 mm, the distance W1 = 4 mm, the width d = 2 mm, and the distance e = 2 mm. Thus, an antenna provided with a notch 11 in which a corner on the first end side of the metal plate was cut out in a triangular shape was created, and measured values and calculated values of VSWR-frequency characteristics were measured. As shown in the figure, it was found that a wideband characteristic having two resonance frequencies can be obtained even when the notch 11 is provided. Therefore, in the calculated value, it was found that VSWR <2 in the band from 1.47 GHz to 2.27 GHz, and the specific band can be as wide as 43%.
また、図１に示す構成のアンテナの面積は（４＋２＋３２）×８８＝３３４４［ｍｍ２］であったが、図１２に示す構成のアンテナの面積は（３＋２＋２８＋３＋２＋２）／２×８８＝１７６０［ｍｍ２］となり、図１に示す構成のアンテナ面積の５３％に小型化することができた。また、図１に示す構成のアンテナの中心周波数は１．６９ＧＨｚであったのに対して図１２に示す構成のアンテナの中心周波数は１．８７ＧＨｚと約１０％増加している。一般的に、アンテナの中心周波数は面積の平方根に反比例して増加するので、それを考慮すると、面積は図１に示す構成のアンテナ面積の６５％に減少したことになる。 Further, the area of the antenna having the configuration shown in FIG. 1 is (4 + 2 + 32) × 88 = 3344 [mm 2 ], but the area of the antenna having the configuration shown in FIG. 12 is (3 + 2 + 28 + 3 + 2 + 2) / 2 × 88 = 1760 [mm 2]. Thus, the antenna area of the configuration shown in FIG. 1 can be reduced to 53%. In addition, the center frequency of the antenna having the configuration shown in FIG. 1 is 1.69 GHz, whereas the center frequency of the antenna having the configuration shown in FIG. In general, since the center frequency of the antenna increases in inverse proportion to the square root of the area, the area is reduced to 65% of the antenna area of the configuration shown in FIG.
即ち、上述した第２実施形態のアンテナによれば、金属板１０の第１端部Ｔ１側の角部を三角形状に切り欠いた切欠部１１を設けても２つの共振周波数を持たせることができ、広帯域特性を保ちつつ切欠分、面積を小さくすることができた。 That is, according to the antenna of the second embodiment described above, two resonance frequencies can be provided even if the cutout portion 11 in which the corner portion on the first end T1 side of the metal plate 10 is cut out in a triangular shape is provided. It was possible to reduce the notch and the area while maintaining the broadband characteristics.
第１実施形態
また、本発明者らは、図１４に示すように、上記距離ｌ＝８８ｍｍ、距離Ｗ２＝３２ｍｍ、距離Ｗ１＝４ｍｍ、幅ｄ＝２ｍｍ、距離ｅ＝２ｍｍのアンテナに、距離Ｃ＝５ｍｍ、１０ｍｍ、１５ｍｍ、２０ｍｍとなるように金属板１０の第１端部Ｔ１側の角部を長方形状に切り欠いた切欠部１１を設けたアンテナを作成し、ＶＳＷＲ−周波数特性の実測値、計算値を測定した。同図に示すように、切欠部１１を設けても２つの共振周波数を持つ広帯域特性が得られることが分かった。
First Embodiment In addition, as shown in FIG. 14, the present inventors set the distance C to the antenna having the distance l = 88 mm, the distance W2 = 32 mm, the distance W1 = 4 mm, the width d = 2 mm, and the distance e = 2 mm. = 5 mm, 10 mm, 15 mm, 20 mm An antenna provided with a notch 11 in which the corner on the first end T1 side of the metal plate 10 is cut out in a rectangular shape is created, and the measured value of VSWR-frequency characteristics The calculated value was measured. As shown in the figure, it was found that a wideband characteristic having two resonance frequencies can be obtained even when the notch 11 is provided.
また、計算値において距離Ｃ＝２０ｍｍの場合は、１．３１ＧＨｚ〜２．１６ＧＨｚの帯域でＶＳＷＲ＜２となり、比帯域を４９％と広帯域にできることが分かった。距離Ｃ＝１５ｍｍの場合は、１．３４ＧＨｚ〜２．１７ＧＨｚの帯域でＶＳＷＲ＜２となり、比帯域を４７％と広帯域にできることが分かった。距離Ｃ＝１０ｍｍ以下でも、２つの共振周波数を持つという特性は得ることができた。 Further, in the calculated value, when the distance C = 20 mm, it was found that VSWR <2 in the band of 1.31 GHz to 2.16 GHz, and the specific band can be widened to 49%. In the case of the distance C = 15 mm, it was found that VSWR <2 in the band of 1.34 GHz to 2.17 GHz, and the specific band can be as wide as 47%. Even when the distance C was 10 mm or less, the characteristic of having two resonance frequencies could be obtained.
また、距離Ｃ＝２０ｍｍの場合の面積は３３４４−２×（４４−２０）＝２７６８［ｍｍ２］（図１に示す構成のアンテナ面積の８３％に小型化）、距離Ｃ１５ｍｍの場合の面積は３３４４−２×（４４−１５）×（３５−１５）＝２３５８［ｍｍ２］（図１に示す構成のアンテナ面積の７０％に小型化）となる。 Further, the area when the distance C = 20 mm is 3344-2 × (44-20) = 2768 [mm 2 ] (downsized to 83% of the antenna area of the configuration shown in FIG. 1), and the area when the distance C is 15 mm, 3344-2 × (44-15) × (35-15) = 2358 [mm 2 ] (downsizing to 70% of the antenna area of the configuration shown in FIG. 1).
また、図１に示す構成のアンテナの中心周波数は１．６９ＧＨｚであったのに対して図１４に示す構成のアンテナの中心周波数は１．７４ＧＨｚ（距離Ｃ＝２０ｍｍ）、１．７６ＧＨｚ（距離Ｃ＝１５ｍｍ）と約３％、約４％増加している。また、一般的に、アンテナの中心周波数は面積の平方根に反比例して増加するので、それを考慮すると、面積は図１に示す構成のアンテナ面積の約８７％、約７７％に減少したことになる。 Further, the center frequency of the antenna having the configuration shown in FIG. 1 is 1.69 GHz, whereas the center frequency of the antenna having the configuration shown in FIG. 14 is 1.74 GHz (distance C = 20 mm), 1.76 GHz (distance C). = 15 mm), about 3% and about 4%. In general, since the center frequency of the antenna increases in inverse proportion to the square root of the area, the area is reduced to about 87% and about 77% of the antenna area of the configuration shown in FIG. Become.
即ち、上述した第３実施形態のアンテナによれば、金属板１０の第１端部Ｔ１側の角部を四角形状に切り欠いた切欠部１１を設けても２つの共振周波数を持たせることができ、広帯域特性を保ちつつ切欠分、面積を小さくすることができた。 That is, according to the antenna of the third embodiment described above, two resonance frequencies can be provided even if the cutout portion 11 in which the corner portion on the first end portion T1 side of the metal plate 10 is cut out in a square shape is provided. It was possible to reduce the notch and the area while maintaining the broadband characteristics.
なお、上述した第２及び第３実施形態によれば、切欠部が三角形状か四角形状になるように設けられていたが、本発明はこれに限ったものではない。角部を切り欠いた形状であればどんな形状であってもよい。 In addition, according to 2nd and 3rd embodiment mentioned above, although the notch part was provided so that it might become a triangle shape or a square shape, this invention is not limited to this. Any shape may be used as long as the corner is cut away.
また、上述した第２及び第３実施形態によれば、上記距離ｌ＝８８ｍｍ、距離Ｗ２＝３２ｍｍ、距離Ｗ１＝４ｍｍ、距離ｅ＝２ｍｍのアンテナに切欠部１１を設けていたが、本発明はこれに限ったものではない。図１０に示すように、２共振特性を持つアンテナであれば、どんなアンテナであってもよい。 Further, according to the second and third embodiments described above, the notch portion 11 is provided in the antenna having the distance l = 88 mm, the distance W2 = 32 mm, the distance W1 = 4 mm, and the distance e = 2 mm. It is not limited to this. As shown in FIG. 10, any antenna may be used as long as it has two resonance characteristics.
また、上述した第２及び第３実施形態によれば、三角形状、四角形状の切欠部１１を設けていたが、本発明はこれに限ったものではない。切欠部１１としては、金属板１０の第１端部Ｔ１側の角部を切り欠いていれば、どんな形状であってもよい。 Further, according to the second and third embodiments described above, the triangular and square cutouts 11 are provided, but the present invention is not limited to this. The cutout 11 may have any shape as long as the corner on the first end T1 side of the metal plate 10 is cut out.
第２実施形態
次に、本発明者らは、図１に示すように、ガラス厚＝５ｍｍ、誘電率（εｒ）＝７．０のガラス上に、距離ｌ＝１８６ｍｍ、距離Ｗ２＝６５ｍｍ、距離Ｗ１＝２ｍｍ、幅ｄ＝４ｍｍ、ｅ＝６５ｍｍのアンテナを搭載して、その周波数に対するＶＳＷＲを計測及びシミュレーションにより求めた。結果を、図１６に示す。同図に示すように、２つの共振周波数（５２０ＭＨｚ、７２０ＭＨｚ）を持つことにより広帯域特性が実現されている（ＶＳＷＲ＜２で比帯域５５％）。
Second Embodiment Next, as shown in FIG. 1, the inventors of the present invention have a distance l = 186 mm, a distance W2 = 65 mm, a distance on a glass having a glass thickness = 5 mm and a dielectric constant (εr) = 7.0. An antenna with W1 = 2 mm, width d = 4 mm, and e = 65 mm was mounted, and VSWR for the frequency was obtained by measurement and simulation. The results are shown in FIG. As shown in the figure, wideband characteristics are realized by having two resonance frequencies (520 MHz and 720 MHz) (VSWR <2 and relative bandwidth 55%).
次に、本発明者らは、ガラス厚＝５ｍｍ、誘電率（εｒ）＝７．０のガラス上に、距離ｌ＝１８６ｍｍ、距離Ｗ２＝６５ｍｍ、距離Ｗ１＝２ｍｍ、幅ｄ＝４ｍｍ、ｅ＝６５ｍｍのアンテナを搭載して、共振周波数５２０ＭＨｚ、７２０ＭＨｚのそれぞれにおける金属板１０の各部に流れる電流の強さをシミュレーションにより求めた。結果を、図１７に示す。図１７（Ａ）は、５２０ＭＨｚのときの電流の強さを示す図であり、図１７（Ｂ）は、７２０ＭＨｚのときの電流の強さを示す図である。 Next, the inventors of the present invention have a distance l = 186 mm, a distance W2 = 65 mm, a distance W1 = 2 mm, a width d = 4 mm, and e = on a glass having a glass thickness = 5 mm and a dielectric constant (εr) = 7.0. A 65 mm antenna was mounted, and the strength of the current flowing through each part of the metal plate 10 at the resonance frequencies of 520 MHz and 720 MHz was obtained by simulation. The results are shown in FIG. FIG. 17A is a diagram showing the current strength at 520 MHz, and FIG. 17B is a diagram showing the current strength at 720 MHz.
図１７中、背景色の濃淡が電流密度の強さ（薄いと弱く、濃いと強い）を表している。同図に示すように、ガラス上に搭載した場合も同様に、金属板１０の第１端部Ｔ１側の長手方向Ｙ１に対向する一対の角部にはほとんど電流が流れていないことが分かった。 In FIG. 17, the density of the background color represents the strength of the current density (weak when it is thin, strong when dark). As shown in the figure, when mounted on glass, it was also found that almost no current flows in the pair of corners facing the longitudinal direction Y1 on the first end T1 side of the metal plate 10. .
そこで、本発明者らは、図１８に示すように、長手方向Ｙ１の端部から第２スリットＳＬ２の縁部に亘って第２スリットＳＬ２に近づくに従って第２端部Ｔ２から離れるように設けた第１切欠線Ｌ１と第１切欠線Ｌ１の第２スリットＳＬ２側の端部から第１端部に亘って第２スリットＳＬ２に沿って設けられた第２切欠線Ｌ２との両切欠線に沿って一対の角部を切り欠いた切欠部１１を設けたアンテナを作製し、ＶＳＷＲ−周波数特性をシミュレーションにより求めた。結果を、図１９中の黒塗りダイヤ形で示す。なお、第２スリットＳＬ２の端部の厚さＣ＝５ｍｍ、第２切欠線Ｌ２の長さｔ＝３５ｍｍとなるように切り欠いている。同図に示すように、図１９に示すような切欠部１１を設けても２つの共振周波数を持つ。また、約４８０ＭＨｚ〜８２０ＭＨｚにおいてＶＳＷＲ＜２．５となり（比帯域５２％）、小型化しても広帯域特性が得られることが分かった。 Accordingly, as shown in FIG. 18, the present inventors provided the distance from the second end T <b> 2 as it approaches the second slit SL <b> 2 across the edge of the second slit SL <b> 2 from the end in the longitudinal direction Y <b> 1. Along both cut lines between the first cut line L1 and the second cut line L2 provided along the second slit SL2 from the end on the second slit SL2 side of the first cut line L1 to the first end. Thus, an antenna provided with a notch 11 having a pair of corners cut out was prepared, and VSWR-frequency characteristics were obtained by simulation. The result is shown by a black diamond shape in FIG. Note that the second slit SL2 is notched so that the end portion has a thickness C = 5 mm and the second notch line L2 has a length t = 35 mm. As shown in the figure, even if the notch 11 as shown in FIG. 19 is provided, it has two resonance frequencies. Further, it was found that VSWR <2.5 (relative band 52%) at about 480 MHz to 820 MHz, and that wide band characteristics can be obtained even when miniaturized.
また、図１に示す構成のアンテナの面積は、（２＋４＋６５）×１８６＝１３２０６［ｍｍ２］であったが、図１８に示す構成のアンテナの面積は１３２０６−（（６５＋３５）×８６／２）×２＝４６０６［ｍｍ２］となり、図１に示す構成のアンテナ面積の３５％に小型化することができた。 Further, the area of the antenna having the configuration shown in FIG. 1 was (2 + 4 + 65) × 186 = 13206 [mm 2 ], but the area of the antenna having the configuration shown in FIG. 18 was 13206 − ((65 + 35) × 86/2). × 2 = 4606 [mm 2 ] It was possible to reduce the size to 35% of the antenna area of the configuration shown in FIG.
第３実施形態
次に、本発明者らは、ガラス厚＝５ｍｍ、誘電率（εｒ）＝７．０のガラス上に、図１８に示すアンテナを搭載して、共振周波数５２０ＭＨｚ、７２０ＭＨｚのそれぞれにおけいて、供給電流の位相を０°、３０°、６０°、９０°、１２０°、１５０°と変えたときの金属板１０の各部に流れる電流の流れ、及び、強さを計測した。結果を、図２０及び図２１に示す。また、図２３は、図２０及び図２１に示す電流の流れの特徴部分を示した図である。
Third Embodiment Next, the present inventors mounted the antenna shown in FIG. 18 on a glass having a glass thickness = 5 mm and a dielectric constant (εr) = 7.0, and each has a resonance frequency of 520 MHz and 720 MHz. Then, the flow and strength of the current flowing through each part of the metal plate 10 when the phase of the supply current was changed to 0 °, 30 °, 60 °, 90 °, 120 °, and 150 ° were measured. The results are shown in FIG. 20 and FIG. FIG. 23 is a diagram showing a characteristic portion of the current flow shown in FIGS.
図２０〜図２２に示すように、第１スリットＳＬ１と長手方向Ｙ１の両端との間には、短手方向Ｙ２に沿った方向に電流が流れておらず、長手方向Ｙ１に沿った方向の電流しか流れていないことが分かった。また、図２０〜図２２に示すように、金属板１０には、第１スリットＳＬ１に沿った方向の電流、第１切欠線Ｌ１に沿った方向の電流、第２スリットＳＬ２に沿った方向の電流が流れていることが分かった。 As shown in FIGS. 20-22, between the 1st slit SL1 and the both ends of the longitudinal direction Y1, the electric current does not flow in the direction along the transversal direction Y2, and the direction of the direction along the longitudinal direction Y1 does not flow. I found that only current was flowing. As shown in FIGS. 20 to 22, the metal plate 10 has a current in the direction along the first slit SL1, a current in the direction along the first notch line L1, and a direction in the direction along the second slit SL2. I found that current was flowing.
そこで、本発明者らは、金属板１０の第２スリットＳＬ２を中心とした長手方向Ｙ１の両側に設けられた第１切欠線Ｌ１、第２スリットＳＬ２、第１スリットＳＬ１、第２端部Ｔ２、長手方向Ｙ１側の端部に囲まれた領域Ａ（図１８参照）を、少なくとも該領域Ａの縁部を残して切り欠いても２共振特性の劣化は少ないのではないかと考えた。 Therefore, the present inventors have a first notch line L1, a second slit SL2, a first slit SL1, and a second end T2 provided on both sides of the longitudinal direction Y1 around the second slit SL2 of the metal plate 10. Even if the region A (see FIG. 18) surrounded by the end portion on the Y1 side in the longitudinal direction is cut out leaving at least the edge of the region A, it is considered that the deterioration of the two resonance characteristics is small.
まず、本発明者らは、図２３に示すように、領域Ａのうち第１スリットＳＬ１と金属板１０の長手方向Ｙ１の両端との間を切り欠いたアンテナ、即ち、切欠部１２（＝第２切欠部）を設けたアンテナを作製して、そのアンテナをガラス厚＝５ｍｍ、誘電率（εｒ）＝７．０のガラス上に搭載した状態で、ＶＳＷＲ−周波数特性をシミュレーションにより求めた。結果を、図１９の白抜きの四角で示す。同図に示すように、切欠部１２を設けてもＶＳＷＲ−周波数特性は図１８のアンテナとほとんど変わらずに、２つの共振周波数を持ち、ＶＳＷＲ＜２．５とすると帯域は約４８０ＭＨｚ〜８２０ＭＨｚとなり（比帯域５２％）、小型化しても広帯域特性が得られることが分かった。 First, as shown in FIG. 23, the present inventors cut out an antenna that is notched between the first slit SL1 and both ends in the longitudinal direction Y1 of the metal plate 10 in the region A, that is, a notch 12 (= first An antenna provided with two notches) was prepared, and the VSWR-frequency characteristics were obtained by simulation in a state where the antenna was mounted on glass having a glass thickness = 5 mm and a dielectric constant (εr) = 7.0. The results are shown by the white squares in FIG. As shown in the figure, even if the notch 12 is provided, the VSWR-frequency characteristic is almost the same as that of the antenna of FIG. 18 and has two resonance frequencies. When VSWR <2.5, the band is about 480 MHz to 820 MHz. (Specific bandwidth 52%), it was found that wide band characteristics can be obtained even if the size is reduced.
そこで、本発明者らは、図２４に示すように、さらに切欠部１３（＝第２切欠部）を設けたアンテナを作製して、そのアンテナをガラス厚＝５ｍｍ、誘電率（εｒ）＝７．０のガラス上に搭載した状態で、ＶＳＷＲ−周波数特性をシミュレーションにより求めた。結果を、図１９の白抜きの三角で示す。同図に示すように、切欠部１３を設けても２つの共振周波数を持ち、ＶＳＷＲ＜２．５とすると帯域は約４７０ＭＨｚ〜７７０ＭＨｚとなり（比帯域４８％）、小型化しても広帯域特性が得られることが分かった。 Therefore, as shown in FIG. 24, the present inventors manufactured an antenna having a notch 13 (= second notch), and the antenna has a glass thickness = 5 mm and a dielectric constant (εr) = 7. The VSWR-frequency characteristics were obtained by simulation while mounted on a glass of 0.0. The results are indicated by white triangles in FIG. As shown in the figure, even if the notch 13 is provided, it has two resonance frequencies, and when VSWR <2.5, the band is about 470 MHz to 770 MHz (ratio band 48%). I found out that
さらに、本発明者らは、図２５に示すように、切欠部１２と切欠部１３とを繋げた切欠部１４（＝第２切欠部）、即ち領域Ａの縁部のみを残して切り欠いた切欠部１４を設けたアンテナを作製して、そのアンテナをガラス厚＝５ｍｍ、誘電率（εｒ）＝７．０のガラス上に搭載した状態で、ＶＳＷＲ−周波数特性をシミュレーションにより求めた。結果を、図１９の白抜きの丸で示す。同図に示すように、切欠部１４を設けてもＶＳＷＲ−周波数特性は図２５のアンテナとほとんど変わらずに、２つの共振周波数を持ち、ＶＳＷＲ＜２．５とすると帯域は約４７０ＭＨｚ〜７７０ＭＨｚとなり（比帯域４８％）、小型化しても広帯域特性が得られることが分かった。 Furthermore, as shown in FIG. 25, the present inventors cut out the cutout portion 14 (= second cutout portion) connecting the cutout portion 12 and the cutout portion 13, that is, leaving only the edge of the region A. An antenna provided with the notch 14 was produced, and the VSWR-frequency characteristics were obtained by simulation in a state where the antenna was mounted on glass having a glass thickness = 5 mm and a dielectric constant (εr) = 7.0. The results are indicated by white circles in FIG. As shown in the figure, even if the notch 14 is provided, the VSWR-frequency characteristic is almost the same as that of the antenna of FIG. 25 and has two resonance frequencies. If VSWR <2.5, the band is about 470 MHz to 770 MHz. (Specific bandwidth 48%), it was found that wide band characteristics can be obtained even if the size is reduced.
上述した図２５に示すアンテナを車両のガラス上に搭載するアンテナに用いれば、線上構造に近い形と成っているため良好な視界を得ることができる。 If the antenna shown in FIG. 25 described above is used for an antenna mounted on a glass of a vehicle, a good field of view can be obtained because it has a shape close to a linear structure.
また、上述した広帯域アンテナの放射特性は、使用帯域においてダイポールアンテナと同等の特性を示すことをシミュレーションで確認している。その利得はガラスなしのアンテナについては約２ｄＢｉ、ガラス上のアンテナにおいては４７０ＭＨｚ〜７７０ＭＨｚにおいて０．５ｄＢｉ以上となり、良好なアンテナとして動作することが確認できた。 In addition, it has been confirmed by simulation that the radiation characteristics of the above-described broadband antenna show the same characteristics as the dipole antenna in the use band. The gain was about 2 dBi for the antenna without glass and 0.5 dBi or more for the antenna on the glass at 470 MHz to 770 MHz, and it was confirmed that the antenna operates as a good antenna.
なお、上述した第３実施形態では、図２３〜図２５に示すような切欠部１２〜１４を設けていたが、本発明はこれに限ったものではない。領域Ａ内の少なくとも縁部を残して切り欠いた切欠部であればどんな形状であってもよい。 In the third embodiment described above, the notches 12 to 14 as shown in FIGS. 23 to 25 are provided, but the present invention is not limited to this. Any shape may be used as long as it is a cutout part that leaves at least an edge in the region A.
また、前述した実施形態は本発明の代表的な形態を示したに過ぎず、本発明は、実施形態に限定されるものではない。即ち、本発明の骨子を逸脱しない範囲で種々変形して実施することができる。 Further, the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.
１０ 金属板
１１ 切欠部
Ａ 領域
Ｌ１ 第１切欠線
Ｌ２ 第２切欠線
ＳＬ１ 第１スリット
ＳＬ２ 第２スリット
Ｔ１ 第１端部
Ｔ２ 第２端部
Ｙ１ 長手方向
Ｙ２ 短手方向
DESCRIPTION OF SYMBOLS 10 Metal plate 11 Notch part A area | region L1 1st notch line L2 2nd notch line SL1 1st slit SL2 2nd slit T1 1st edge part T2 2nd edge part Y1 Longitudinal direction Y2 Short direction
Claims (3)
前記金属板の前記第１端部側において前記長手方向に対向する一対の角部を切り欠いた一対の第１切欠部を設け、
前記一対の第１切欠部が各々、四角形状になるように切り欠かれていることを特徴とするアンテナ。 A rectangular metal plate, a first slit provided along the longitudinal direction of the metal plate, and from the center of the first slit to the first end of the metal plate along the short direction of the metal plate. An extended second slit is provided, and the distance between the first end and the first slit is opposed to the first end of the metal plate so as to have two resonance frequencies. In the antenna provided to be larger than the distance between the second end and the first slit,
Providing a pair of first cutouts by cutting out a pair of corners facing the longitudinal direction on the first end side of the metal plate;
The antenna is characterized in that the pair of first cutout portions are cut out so as to have a quadrangular shape .
前記金属板の前記第１端部側において前記長手方向に対向する一対の角部を切り欠いた一対の第１切欠部を設け、
前記一対の第１切欠部が各々、前記金属板の長手方向側の端部から前記第２スリットの縁部に亘って前記第２スリットに近づくに従って前記第２端部から離れるように前記金属板上に設けた第１切欠線と該第１切欠線の前記第２スリット側の端部から前記第１端部に亘って前記第２スリットに沿って前記金属板上に設けられた第２切欠線との両切欠線に沿って切り欠いて設けられていることを特徴とするアンテナ。 A rectangular metal plate, a first slit provided along the longitudinal direction of the metal plate, and from the center of the first slit to the first end of the metal plate along the short direction of the metal plate. An extended second slit is provided, and the distance between the first end and the first slit is opposed to the first end of the metal plate so as to have two resonance frequencies. In the antenna mounted on the glass, provided larger than the distance between the second end and the first slit,
Providing a pair of first cutouts by cutting out a pair of corners facing the longitudinal direction on the first end side of the metal plate;
The pair of first cutout portions each move away from the second end portion as it approaches the second slit from the longitudinal end portion of the metal plate to the edge of the second slit. A first cutout line provided on the metal plate along the second slit from the end on the second slit side of the first cutout line to the first end. An antenna, characterized by being cut out along a notch line with a line .
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