JPH0837416A - Microstrip antenna - Google Patents

Microstrip antenna

Info

Publication number
JPH0837416A
JPH0837416A JP19107194A JP19107194A JPH0837416A JP H0837416 A JPH0837416 A JP H0837416A JP 19107194 A JP19107194 A JP 19107194A JP 19107194 A JP19107194 A JP 19107194A JP H0837416 A JPH0837416 A JP H0837416A
Authority
JP
Japan
Prior art keywords
electrode
diagonal line
length
conductor
microstrip antenna
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP19107194A
Other languages
Japanese (ja)
Other versions
JP3128183B2 (en
Inventor
Katsuro Nakamura
克朗 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.)
Toko Inc
Original Assignee
Toko Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toko Inc filed Critical Toko Inc
Priority to JP19107194A priority Critical patent/JP3128183B2/en
Publication of JPH0837416A publication Critical patent/JPH0837416A/en
Application granted granted Critical
Publication of JP3128183B2 publication Critical patent/JP3128183B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Waveguide Aerials (AREA)

Abstract

PURPOSE:To set a band width of the antenna to be a desired width by providing a difference in each length of radiation electrodes. CONSTITUTION:A quadrilateral electrode 11 is formed on the surface of a rectangular dielectric board 10, and an earth electrode 12 is formed on almost the entire face of a rear side. The electrode 11 is formed not in rectangular but in axially symmetric with respect to a diagonal line passing through an impedance matching point. Let the length of sides with respect to the diagonal line be a, b and the length of the other sides c, d, then the relation of a=c, b=d and anot equal to b is set. Then the length up to the opposite side is continuously different by differentiating the length of adjacent sides in this way, and a structure of parallel connection of plural resonator lines whose length is continuously changed is obtained and a wide band characteristic is obtained.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、マイクロストリップア
ンテナに係るもので、特に放射電極の形状を改良した広
帯域のマイクロストリップアンテナに関するものであ
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microstrip antenna, and more particularly to a wideband microstrip antenna having an improved shape of a radiation electrode.

【0002】[0002]

【従来の技術】誘電体基板の表面に放射電極を具え、裏
面にアース電極を具えたマイクロストリップアンテナ
が、小型、薄型化の要求を満たすアンテナとして各方面
で利用されている。
2. Description of the Related Art Microstrip antennas having a radiation electrode on the front surface of a dielectric substrate and a ground electrode on the back surface have been used in various fields as antennas satisfying the demands for downsizing and thinning.

【0003】このマイクロストリップアンテナを2.5GHZ
帯の無線LANのアンテナとして利用することも考えら
れている。小型、薄型化が可能であることから、設置す
る場所に制約を受けない利点を有するためである。
This microstrip antenna is 2.5GHZ
It is also considered to be used as an antenna for a band wireless LAN. This is because it is possible to make it small and thin, and it has the advantage that there is no restriction on the installation location.

【0004】この無線LANは拡散スペクトラム方式を
用いるために特に広い帯域を必要とする。そのために、
使用するアンテナも広帯域に対応できることが要求され
る。
This wireless LAN requires a particularly wide band in order to use the spread spectrum system. for that reason,
The antenna used is also required to be compatible with a wide band.

【0005】[0005]

【発明が解決しようとする課題】マイクロストリップア
ンテナを用いて直線偏波のアンテナの帯域幅を広げるた
めには、誘電体の素材の厚みを増すか、低Qの素材を使
用する方法もあるが、小型、薄型の利点を活かすために
は誘電率の大きなマイクロストリップアンテナを利用す
ることが望ましい。
In order to increase the bandwidth of a linearly polarized antenna using a microstrip antenna, there is a method of increasing the thickness of the dielectric material or using a low Q material. In order to take advantage of the small size and the thin shape, it is desirable to use a microstrip antenna having a large dielectric constant.

【0006】本発明は、無線LAN等に使用される拡散
スペクトラム変調に対して要求される広帯域に使用でき
るマイクロストリップアンテナを提供するものである。
The present invention provides a microstrip antenna which can be used in a wide band required for spread spectrum modulation used in a wireless LAN or the like.

【0007】[0007]

【課題を解決するための手段】本発明は、マイクロスト
リップアンテナの放射電極の形状を改良することによっ
て、上記の課題を解決するものである。
The present invention solves the above problems by improving the shape of the radiation electrode of the microstrip antenna.

【0008】すなわち、長方形の誘電体基板の表面に四
辺形の放射電極を、裏面にアース電極を具え、誘電体基
板の貫通孔に挿入される導体がインピーダンス整合点で
放射電極に接続されるマイクロストリップアンテナにお
いて、そのインピーダンス整合点は放射電極の対角線上
とし、その対角線を挟む放射電極の二辺はそれぞれ長さ
が等しく、その対角線の同じ側にある放射電極の二辺は
長さが異なることに特徴を有するものである。
That is, a quadrilateral radiating electrode is provided on the front surface of a rectangular dielectric substrate and a ground electrode is provided on the back surface, and a conductor inserted into a through hole of the dielectric substrate is connected to the radiating electrode at an impedance matching point. In the strip antenna, the impedance matching point shall be on the diagonal line of the radiating electrode, the two sides of the radiating electrode that sandwich the diagonal line shall have the same length, and the two sides of the radiating electrode on the same side of the diagonal line shall have different lengths. It is characterized by

【0009】[0009]

【作用】放射電極の長さに差を持たせることにより、マ
イクロストリップアンテナの共振周波数に幅を有するよ
うになる。その差を調整することによって、必要な帯域
幅を有するマイクロストリップアンテナを得ることがで
きる。
By making the lengths of the radiation electrodes different, the resonance frequency of the microstrip antenna has a width. By adjusting the difference, a microstrip antenna having the required bandwidth can be obtained.

【0010】[0010]

【実施例】以下、図面を参照して、本発明の実施例につ
いて説明する。
Embodiments of the present invention will be described below with reference to the drawings.

【0011】図1は、本発明の実施例を示す正面図であ
る。長方形の誘電体基板10の表面に四辺形の放射電極11
を形成し、裏面のほぼ全面にアース電極12を形成する。
この放射電極11とアース電極12は導体を印刷、焼付けし
た後、メッキ等によって導体膜を形成する。この放射電
極11の50Ωのインピーダンス整合点で給電される。給電
は、誘電体基板10に形成した貫通孔に挿入された導体を
通して行われ、その導体に接続された導体を内部導体と
し、アース電極12に接続された導体を、外部導体とする
同軸線路に接続される。
FIG. 1 is a front view showing an embodiment of the present invention. A quadrilateral radiating electrode 11 on the surface of a rectangular dielectric substrate 10.
And the ground electrode 12 is formed on almost the entire back surface.
The radiating electrode 11 and the earth electrode 12 are formed by printing a conductor and printing it, and then forming a conductor film by plating or the like. The radiation electrode 11 is fed at the impedance matching point of 50Ω. Power feeding is performed through a conductor inserted in a through hole formed in the dielectric substrate 10, the conductor connected to the conductor is used as an inner conductor, and the conductor connected to the ground electrode 12 is used as a coaxial line as an outer conductor. Connected.

【0012】放射電極11は長方形ではなく、インピーダ
ンス整合点を通る対角線に対して線対称に形成される。
対角線の一方の側の辺の長さをそれぞれa、bとし、反
対側の辺の長さをそれぞれc、dとするとき、a=c、
b=dとする。長さaの辺と長さcの辺は対角線で接す
るようにする。そして、対角線に対して同じ側にある辺
の長さaとbとは異なるようにする。すなわち、a≠b
とする。この例では、給電点を通る対角線の長さが他の
対角線よりも長くしてある。
The radiation electrode 11 is not rectangular but is formed line-symmetrically with respect to a diagonal line passing through the impedance matching point.
When the lengths of the sides on one side of the diagonal line are a and b, and the lengths of the sides on the opposite side are c and d, respectively, a = c,
Let b = d. The side having the length a and the side having the length c are contacted with a diagonal line. Then, the lengths a and b on the same side with respect to the diagonal line are made different. That is, a ≠ b
And In this example, the length of the diagonal line passing through the feeding point is longer than the other diagonal lines.

【0013】図2は給電点を通る対角線の長さが他の対
角線の長さよりも短い例を示す本発明の実施例の正面図
で、誘電体基板20上に放射電極21が形成されたことは前
期の例と同じである。
FIG. 2 is a front view of an embodiment of the present invention showing an example in which the length of the diagonal line passing through the feeding point is shorter than the length of the other diagonal lines. The radiation electrode 21 is formed on the dielectric substrate 20. Is the same as the previous example.

【0014】本発明によるマイクロストリップアンテナ
は隣接する辺の長さが異なることから、対向する辺まで
の長さが連続的に異なることになって、連続的に変化す
る複数の共振線を並列に接続した構造となる。これによ
って、広帯域特性が得られる。
In the microstrip antenna according to the present invention, since the lengths of adjacent sides are different, the lengths to the opposite sides are continuously different, and a plurality of continuously changing resonance lines are arranged in parallel. It becomes a connected structure. Thereby, a wide band characteristic can be obtained.

【0015】図3は、本発明の他の実施例を示す正面図
で、誘電体基板30に放射電極31とアース電極32を形成し
たマイクロストリップアンテナを配線基板35に搭載した
ものである。配線基板35の表面にはアース電極32に接続
された導体パターン36が形成され、裏面には給電点で放
射電極31に接続された導体パターン37が接続され、この
導体パターン36と導体パターン37が配線基板35の両面で
対向している。導体パターン36から給電点を通る対角線
に対して直角方向に突出する導体パターン38が形成され
ている。
FIG. 3 is a front view showing another embodiment of the present invention, in which a microstrip antenna in which a radiation electrode 31 and a ground electrode 32 are formed on a dielectric substrate 30 is mounted on a wiring substrate 35. A conductor pattern 36 connected to the ground electrode 32 is formed on the front surface of the wiring board 35, and a conductor pattern 37 connected to the radiating electrode 31 at the feeding point is connected to the back surface of the conductor pattern 36 and the conductor pattern 37. Both sides of the wiring board 35 face each other. A conductor pattern 38 is formed to project from the conductor pattern 36 in a direction perpendicular to a diagonal line passing through the feeding point.

【0016】この導体パターン38を形成することによっ
て、垂直偏波に対する水平方向の指向性がなくなるとと
もに、更に帯域幅を広げることができる。
By forming the conductor pattern 38, the directivity in the horizontal direction with respect to the vertically polarized wave is eliminated, and the bandwidth can be further widened.

【0017】また、図4に示したように、放射電極51
a、51bを曲線に形成しても同様な特性が得られる。こ
れによって、対向する辺までの長さの比の変化をより大
きくすることもできる。また、図6に示したように、対
向する角の一部を切り取っても特性はほとんど変化しな
い。
Further, as shown in FIG.
Similar characteristics can be obtained by forming a and 51b into a curved line. As a result, it is possible to further increase the change in the ratio of the lengths to the opposite sides. Further, as shown in FIG. 6, even if some of the opposite corners are cut off, the characteristics hardly change.

【0018】図5は、本発明によるマイクロストリップ
アンテナの特性の説明図で、リターンロス特性を示すも
のである。長さを変えない従来のマイクロストリップア
ンテナの特性を示すのが(a)で、本発明によるマイク
ロストリップアンテナの特性を示すのが(b)である。
図(a)で10dBの位置での帯域幅W1 が24.8MHz であっ
たのに対して、図(b)では帯域幅W2 は37.9MHz と約
50%広がっていた。
FIG. 5 is an explanatory view of the characteristics of the microstrip antenna according to the present invention, showing the return loss characteristics. The characteristic of the conventional microstrip antenna whose length is not changed is shown in (a), and the characteristic of the microstrip antenna according to the present invention is shown in (b).
The bandwidth W 1 at the position of 10 dB is 24.8 MHz in the figure (a), while the bandwidth W 2 is about 37.9 MHz in the figure (b).
It was spread by 50%.

【0019】[0019]

【発明の効果】本発明によれば、小型、薄型の特性を維
持したまま、マイクロストリップアンテナの帯域を大幅
に広げることが可能となる。
According to the present invention, the band of the microstrip antenna can be significantly widened while maintaining the characteristics of small size and thin shape.

【0020】これによって、無線LANの拡散スペクト
ラム方式等に敵した広帯域の小型のアンテナを得ること
ができる。
As a result, it is possible to obtain a small antenna having a wide band, which complies with the spread spectrum system of the wireless LAN.

【図面の簡単な説明】[Brief description of drawings]

【図1】 本発明の実施例を示す正面図FIG. 1 is a front view showing an embodiment of the present invention.

【図2】 本発明の他の実施例を示す正面図FIG. 2 is a front view showing another embodiment of the present invention.

【図3】 本発明の他の実施例を示す正面図FIG. 3 is a front view showing another embodiment of the present invention.

【図4】 本発明の他の実施例を示す正面図FIG. 4 is a front view showing another embodiment of the present invention.

【図5】 本発明によるマイクロストリップアンテナの
特性の説明図
FIG. 5 is an explanatory diagram of characteristics of the microstrip antenna according to the present invention.

【図6】 本発明の他の実施例を示す正面図FIG. 6 is a front view showing another embodiment of the present invention.

【符号の説明】[Explanation of symbols]

10、20、30:誘電体基板 11、21、31、51、71:放射電極 10, 20, 30: Dielectric substrate 11, 21, 31, 51, 71: Radiation electrode

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 長方形の誘電体基板の表面に四辺形の放
射電極を、裏面にアース電極を具え、誘電体基板の貫通
孔に挿入される導体がインピーダンス整合点で放射電極
に接続されるマイクロストリップアンテナにおいて、そ
のインピーダンス整合点は放射電極の対角線上とし、そ
の対角線を挟む放射電極の二辺はそれぞれ長さが等し
く、その対角線の同じ側にある放射電極の二辺は長さが
異なることを特徴とするマイクロストリップアンテナ。
1. A micro dielectric in which a rectangular dielectric substrate has a quadrilateral radiating electrode on the front surface and a ground electrode on the back surface, and a conductor inserted into a through hole of the dielectric substrate is connected to the radiating electrode at an impedance matching point. In the strip antenna, the impedance matching point shall be on the diagonal line of the radiating electrode, the two sides of the radiating electrode that sandwich the diagonal line shall have the same length, and the two sides of the radiating electrode on the same side of the diagonal line shall have different lengths. Microstrip antenna characterized by.
【請求項2】 長方形の誘電体基板の表面に四辺形の放
射電極を、裏面にアース電極を具え、誘電体基板の貫通
孔に挿入される導体がインピーダンス整合点で放射電極
に接続されるマイクロストリップアンテナにおいて、そ
のインピーダンス整合点は放射電極の対角線上とし、放
射電極はその対角線に線対称に形成され、その対角線の
同じ側にある放射電極の二辺は長さが異なることを特徴
とするマイクロストリップアンテナ。
2. A micro dielectric in which a rectangular dielectric substrate has a quadrilateral radiating electrode on the front surface and a ground electrode on the back surface, and a conductor inserted in a through hole of the dielectric substrate is connected to the radiating electrode at an impedance matching point. In the strip antenna, the impedance matching point is on the diagonal line of the radiation electrode, the radiation electrode is formed line-symmetrically to the diagonal line, and the two sides of the radiation electrode on the same side of the diagonal line are different in length. Microstrip antenna.
【請求項3】 当該対角線の延長線上に、当該延長線に
対して直角の方向に延びる導体を具え、その導体がアー
ス電極と接続された請求項1または請求項2記載のマイ
クロストリップアンテナ。
3. The microstrip antenna according to claim 1, further comprising a conductor extending in a direction perpendicular to the extension line on the extension line of the diagonal line, the conductor being connected to a ground electrode.
【請求項4】 放射導体と導通された導体パターンとア
ース電極に接続された導体パターンとが配線基板に形成
された平行な導体パターンである請求項3記載のマイク
ロストリップアンテナ。
4. The microstrip antenna according to claim 3, wherein the conductor pattern electrically connected to the radiation conductor and the conductor pattern connected to the ground electrode are parallel conductor patterns formed on the wiring board.
【請求項5】 放射電極の当該対角線を挟む二組の二辺
の少なくとも一方の組が曲線である請求項1または請求
項2記載のマイクロストリップアンテナ。
5. The microstrip antenna according to claim 1, wherein at least one of the two sides of the radiation electrode sandwiching the diagonal line is a curve.
JP19107194A 1994-07-21 1994-07-21 Microstrip antenna Expired - Fee Related JP3128183B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19107194A JP3128183B2 (en) 1994-07-21 1994-07-21 Microstrip antenna

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19107194A JP3128183B2 (en) 1994-07-21 1994-07-21 Microstrip antenna

Publications (2)

Publication Number Publication Date
JPH0837416A true JPH0837416A (en) 1996-02-06
JP3128183B2 JP3128183B2 (en) 2001-01-29

Family

ID=16268392

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19107194A Expired - Fee Related JP3128183B2 (en) 1994-07-21 1994-07-21 Microstrip antenna

Country Status (1)

Country Link
JP (1) JP3128183B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100648903B1 (en) * 1998-04-29 2007-03-02 교세라 가부시키가이샤 Plane antenna, and portable radio using thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100648903B1 (en) * 1998-04-29 2007-03-02 교세라 가부시키가이샤 Plane antenna, and portable radio using thereof

Also Published As

Publication number Publication date
JP3128183B2 (en) 2001-01-29

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