JP2003023316A - Antenna and production method for the same - Google Patents
Antenna and production method for the sameInfo
- Publication number
- JP2003023316A JP2003023316A JP2001210215A JP2001210215A JP2003023316A JP 2003023316 A JP2003023316 A JP 2003023316A JP 2001210215 A JP2001210215 A JP 2001210215A JP 2001210215 A JP2001210215 A JP 2001210215A JP 2003023316 A JP2003023316 A JP 2003023316A
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- Prior art keywords
- electrode
- antenna
- feeding point
- radiation electrode
- radiation
- Prior art date
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- Multi-Conductor Connections (AREA)
- Coupling Device And Connection With Printed Circuit (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Waveguide Aerials (AREA)
- Details Of Aerials (AREA)
Abstract
Description
【発明の詳細な説明】Detailed Description of the Invention
【０００１】[0001]
【発明の属する技術分野】本発明は、携帯電話機などに
用いられて送受信できる周波数帯域幅が広いアンテナに
関するものである。また、そのアンテナの製造方法に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna having a wide frequency bandwidth which can be transmitted and received by being used in a mobile phone or the like. It also relates to a method for manufacturing the antenna.
【０００２】[0002]
【従来の技術】従来の携帯電話機などに内蔵されて用い
られ、しかも２つの周波数帯域を送受信できるアンテナ
の一例を図９および図１０に示す。図９は、従来のアン
テナの一例の平面図である。図１０は、図９のＡ−Ａ断
面拡大図である。2. Description of the Related Art FIGS. 9 and 10 show an example of an antenna that is used by being built in a conventional mobile phone or the like and that can transmit and receive two frequency bands. FIG. 9 is a plan view of an example of a conventional antenna. FIG. 10 is an enlarged view of the AA cross section of FIG. 9.
【０００３】図９および図１０に示すごとく、従来のア
ンテナは、絶縁樹脂からなるキャリア１０の表面に、導
電体板からなる放射電極１２が配設される。この放射電
極１２は、導電体板に適宜なスリット１２ａが形成され
て実質的に寸法の長い形状のものとされ、その一方に偏
った中央部に給電点１４とグランド電極接続点１６が設
けられるとともに両端部が開放端とされる。また、キャ
リア１０は、表面にグランド電極１８が設けられる回路
基板２０上に搭載される。As shown in FIGS. 9 and 10, in the conventional antenna, a radiation electrode 12 made of a conductor plate is arranged on the surface of a carrier 10 made of an insulating resin. The radiation electrode 12 is formed into a substantially long shape by forming an appropriate slit 12a on a conductor plate, and a feeding point 14 and a ground electrode connecting point 16 are provided at a central portion deviated to one side. At the same time, both ends are open ends. Further, the carrier 10 is mounted on the circuit board 20 on the surface of which the ground electrode 18 is provided.
【０００４】かかる構成において、給電点１４から端部
の開放端までの寸法が長い側の放射電極部分で低い周波
数帯域の信号を送受信し、給電点１４から端部の開放端
までの寸法が短い側の放射電極部分で高い周波数帯域の
信号を送受信する。In such a structure, a signal in a low frequency band is transmitted and received by the radiation electrode portion on the side where the dimension from the feeding point 14 to the open end is long, and the dimension from the feeding point 14 to the open end is short. Signals in a high frequency band are transmitted and received at the side radiation electrode portion.
【０００５】[0005]
【発明が解決しようとする課題】上記従来のアンテナ
は、低い周波数帯域と高い周波数帯域に対して、それぞ
れ逆Ｆアンテナを形成するとともに放射電極１２を面状
として各周波数帯における帯域幅の拡大が図られてい
る。ここで、逆Ｆアンテナの帯域幅は、一般的にＶＳＷ
Ｒ３以下で３〜６％にすぎず、放射電極１２を面状とし
てもその改善には限度がある。一方、２つの周波数帯を
ＧＳＭ（８８０〜９６０ＭＨｚ）とＤＣＳ（１７１０〜
１８８０ＭＨｚ）に設定するならば、ＧＳＭの送受信に
必要な帯域幅は８．６％であり、ＤＣＳの送受信に必要
な帯域幅は９．５％である。しかも、アンテナの共振周
波数が周波数帯の中心からずれていれば、送受信に必要
とされる帯域幅はさらに広いものが要求される。そこ
で、周波数帯域幅のより広いアンテナが要望されてい
た。In the above-mentioned conventional antenna, an inverse F antenna is formed for each of the low frequency band and the high frequency band, and the radiation electrode 12 is formed into a planar shape to expand the bandwidth in each frequency band. Has been planned. Here, the bandwidth of the inverted F antenna is generally VSW.
If it is R3 or less, it is only 3 to 6%, and there is a limit to the improvement even if the radiation electrode 12 has a planar shape. On the other hand, two frequency bands are GSM (880 to 960 MHz) and DCS (1710).
1880 MHz), the bandwidth required for GSM transmission / reception is 8.6%, and the bandwidth required for DCS transmission / reception is 9.5%. Moreover, if the resonance frequency of the antenna deviates from the center of the frequency band, a wider bandwidth required for transmission and reception is required. Therefore, an antenna having a wider frequency bandwidth has been demanded.
【０００６】本発明は、上述のごとき従来技術の事情に
鑑みてなされたもので、周波数帯域幅が広いアンテナを
提供することを目的とする。また、該周波数帯域幅が広
いアンテナを量産するのに好適な製造方法を提供するこ
とを目的とする。The present invention has been made in view of the circumstances of the prior art as described above, and an object thereof is to provide an antenna having a wide frequency bandwidth. Another object of the present invention is to provide a manufacturing method suitable for mass-producing antennas having a wide frequency bandwidth.
【０００７】[0007]
【課題を解決するための手段】かかる目的を達成するた
めに、本発明のアンテナは、グランド電極に対して離し
て放射電極を配設し、前記放射電極の一端部に給電点と
グランド電極接続点とを設けるとともに他端部を開放端
とするアンテナにおいて、前記放射電極を折り返して前
記開放端を前記給電点から送受信周波数帯の１／１６〜
１／８波長離した前記放射電極の位置に容量結合するよ
うに構成されている。In order to achieve the above object, the antenna of the present invention has a radiation electrode disposed apart from the ground electrode, and one end of the radiation electrode is connected to a feeding point and the ground electrode. And an antenna having the other end as an open end, the radiation electrode is folded back so that the open end is from the feeding point to 1/16 of a transmission / reception frequency band.
It is configured to be capacitively coupled to the position of the radiation electrode that is separated by 1/8 wavelength.
【０００８】また、グランド電極に対して離して放射電
極を配設し、前記放射電極の一方に偏った中間部に給電
点とグランド電極接続点とを設けるとともに両端部を開
放端として２つの周波数帯を送受信するアンテナにおい
て、前記放射電極の両端側をそれぞれに折り返して、そ
れぞれの前記開放端を前記給電点から当該開放端側の放
射電極部分で送受信する周波数帯の１／１６〜１／８波
長離した前記放射電極部分の位置にそれぞれに容量結合
するように構成しても良い。Further, a radiation electrode is arranged apart from the ground electrode, a feeding point and a ground electrode connection point are provided in an intermediate portion which is biased to one side of the radiation electrode, and both ends are open ends, thus providing two frequencies. In an antenna for transmitting and receiving a band, both ends of the radiating electrode are folded back to each other, and 1/16 to 1/8 of a frequency band for transmitting and receiving the respective open ends from the feeding point to the radiating electrode portion on the open end side. You may comprise so that it may each capacitively couple to the position of the said radiation electrode part which wavelength separated.
【０００９】さらに、前記放射電極を導電体板で形成
し、前記給電点およびグランド電極接続点でそれぞれに
スプリングコネクタの一端部を前記導電体板に圧入また
はカシメにより固定するとともに電気的接続して構成す
ることもできる。Further, the radiation electrode is formed of a conductor plate, and one end of a spring connector is press-fitted or caulked to the conductor plate at the feeding point and the ground electrode connection point, respectively, and electrically connected. It can also be configured.
【００１０】そして、本発明のアンテナの製造方法は、
導電体板のフープ材に請求項１または２記載の放射電極
を一部分を連結して打ち抜き形成し、このフープ材を金
型にインサートして前記放射電極に絶縁樹脂材からなる
キャリアをそれぞれにインサート成形し、さらに前記キ
ャリアと一体化された前記放射電極の給電点およびグラ
ンド電極接続点にスプリングコネクタの一端部を圧入固
定し、その後、前記放射電極を前記フープ材から切り離
して製造する。The antenna manufacturing method of the present invention is
The radiation electrode according to claim 1 or 2 is partially connected to a hoop material of a conductor plate and punched out, and the hoop material is inserted into a mold to insert a carrier made of an insulating resin material into the radiation electrode. One end of the spring connector is press-fitted and fixed to the feeding point and the ground electrode connecting point of the radiation electrode which is molded and integrated with the carrier, and then the radiation electrode is separated from the hoop material to manufacture.
【００１１】[0011]
【発明の実施の形態】以下、本発明の一実施例を図１な
いし図８を参照して説明する。図１は、本発明のアンテ
ナの外観図であり、（ａ）は平面図、（ｂ）は側面図、
（ｃ）は正面図である。図２は、放射電極にスプリング
コネクタの一端部を圧入した構造を示す断面図である。
図３は、本発明のアンテナの周波数対ＶＳＷＲ特性図で
ある。図４は、本発明のアンテナのスミスチャートであ
る。図５は、ＧＳＭの周波数帯の各周波数における放射
特性図であり、（ａ）は８８０ＭＨｚ、（ｂ）は９１５
ＭＨｚ、（ｃ）は９２５ＭＨｚ、（ｄ）９６０ＭＨｚで
ある。図６は、ＤＣＳの周波数帯の各周波数における放
射特性図であり、（ａ）は１７１０ＭＨｚ、（ｂ）は１
７８５ＭＨｚ、（ｃ）は１８０５ＭＨｚ、（ｄ）は１８
８０ＭＨｚである。図７は、本発明のアンテナの各周波
数における最大利得と平均利得の表である。図８は、本
発明のアンテナの製造方法の工程を示す図であり、
（ａ）はフープ材に放射電極を打ち抜い図、（ｂ）は打
ち抜いた放射電極にキャリアをインサート成形した図、
（ｃ）は放射電極とキャリアの一体物にスプリングコネ
クタを圧入した図、（ｄ）は放射電極をフープ材から切
り離してアンテナとした図である。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an external view of an antenna of the present invention, (a) is a plan view, (b) is a side view,
(C) is a front view. FIG. 2 is a sectional view showing a structure in which one end of a spring connector is press-fitted into the radiation electrode.
FIG. 3 is a frequency vs. VSWR characteristic diagram of the antenna of the present invention. FIG. 4 is a Smith chart of the antenna of the present invention. FIG. 5 is a radiation characteristic diagram at each frequency in the GSM frequency band, in which (a) is 880 MHz and (b) is 915.
MHz, (c) is 925 MHz, and (d) is 960 MHz. FIG. 6 is a radiation characteristic diagram at each frequency in the DCS frequency band, where (a) is 1710 MHz and (b) is 1
785MHz, (c) 1805MHz, (d) 18
It is 80 MHz. FIG. 7 is a table of maximum gains and average gains at each frequency of the antenna of the present invention. FIG. 8 is a diagram showing steps of the method for manufacturing an antenna of the present invention,
(A) is a diagram in which a radiation electrode is punched out in a hoop material, (b) is a diagram in which a carrier is insert-molded in the punched radiation electrode,
(C) is a diagram in which a spring connector is press-fitted into an integrated body of a radiation electrode and a carrier, and (d) is a diagram in which the radiation electrode is separated from a hoop material to form an antenna.
【００１２】まず、導電体板から放射電極２２がプレス
加工などにより打ち抜き形成される。この放射電極２２
は、スリット２２ａ，２２ｂ，２２ｃ等が適宜に切り込
まれて実質的に寸法の長いものとされ、しかもその一方
に偏った中間部に給電点１４とグランド電極接続点１６
が形成され、スプリングコネクタ２４，２４の一端がそ
れぞれ圧入され得る孔が穿設される。放射電極２２は、
スリット２２ｂにより給電点１４を中心とする２つの放
射電極部分からなる放射電極と見なすことができ、しか
も２つの放射電極部分はスリット２２ａ，２２ｃでそれ
ぞれに折り返す形状とされる。そして、給電点１４から
一方の先端部の開放端までの寸法が長い側の放射電極部
分は低い周波数帯、例えばＧＳＭに共振する電気長に設
定される。また、給電点１４から他方の先端部の開放端
までの寸法が短い側の放射電極部分は高い周波数帯、例
えばＤＣＳに共振する電気長に設定される。しかも、寸
法の長い放射電極部分では、スリット２２ａによる折り
返しでその開放端が（特に電圧最大点）が、給電点１４
からその開放端側へ低い周波数帯域の１／１６〜１／８
波長だけ離した位置に容量結合するように形成される。
また、寸法の短い放射電極部分では、スリット２２ｃに
よる折り返しでその開放端（特に電圧最大点）が給電点
１４からその開放端側へ高い周波数帯の１／１６〜１／
８波長だけ離した位置に容量結合するように形成され
る。さらに、長い寸法の放射電極部分の先端側は面積を
大として容量環が形成される。また、短い寸法の放射電
極部分の給電点１４側は面積を大として形成される。First, the radiation electrode 22 is stamped and formed from a conductor plate by press working or the like. This radiation electrode 22
Has a substantially long dimension by appropriately slitting slits 22a, 22b, 22c and the like, and further, the feeding point 14 and the ground electrode connecting point 16 are provided at an intermediate portion deviated to one side.
Are formed, and holes into which one ends of the spring connectors 24, 24 can be press-fitted are formed. The radiation electrode 22 is
The slit 22b can be regarded as a radiating electrode composed of two radiating electrode portions centering on the feeding point 14, and the two radiating electrode portions are respectively folded into slits 22a and 22c. Then, the radiation electrode portion on the longer side from the feeding point 14 to the open end of the one tip is set to a low frequency band, for example, an electrical length that resonates with GSM. In addition, the radiation electrode portion on the shorter side from the feeding point 14 to the open end of the other tip portion is set to a high frequency band, for example, an electrical length that resonates with DCS. Moreover, in the long radiating electrode portion, the open end (particularly the maximum voltage point) is turned back by the slit 22a, and
To 1/16 to 1/8 of the low frequency band from the open end side
They are formed so as to be capacitively coupled at positions separated by the wavelength.
Further, in the radiating electrode portion having a short dimension, the open end (particularly, the maximum voltage point) is folded back by the slit 22c to 1/16 to 1/1 of the high frequency band from the feeding point 14 to the open end side.
It is formed so as to be capacitively coupled at positions separated by 8 wavelengths. Further, a capacitance ring is formed with a large area on the tip side of the long-sized radiation electrode portion. Further, the radiation electrode portion having a short dimension is formed with a large area on the feeding point 14 side.
【００１３】かかる形状の放射電極２２には、給電点１
４およびグランド電極接続点１６以外にも適宜に小さな
孔が穿設される。そして、適宜な誘電率を有する絶縁樹
脂からなるキャリア２６の表面に配設固定される。その
配設固定構造は、放射電極２２をインサートしてキャリ
ア２６と一体成形しても良く、またキャリア２６の表面
に突出させた突起を放射電極２２の孔に通してその先端
を融着させても良い。また、放射電極２２の給電点１４
とグランド電極接続点１６に穿設された孔には、図２に
示すごと、スプリングコネクタ２４，２４の一端が圧入
されまたはカシメられて固定される。このスプリングコ
ネクタ２４，２４の他端は、回路基板２０のグランド電
極１８および給電回路（図示せず）に弾接して電気的接
続されるように、放射電極２２とキャリア２６が回路基
板２０に相対的に固定される。The radiation electrode 22 having such a shape has a feeding point 1
4 and the ground electrode connection point 16 are appropriately formed with small holes. Then, it is disposed and fixed on the surface of the carrier 26 made of an insulating resin having an appropriate dielectric constant. The arrangement and fixing structure may be such that the radiation electrode 22 is inserted and integrally molded with the carrier 26. Alternatively, the projection protruding on the surface of the carrier 26 is passed through the hole of the radiation electrode 22 and the tip thereof is fused. Is also good. In addition, the feeding point 14 of the radiation electrode 22
As shown in FIG. 2, one end of the spring connectors 24, 24 is press-fitted or caulked and fixed in the hole formed in the ground electrode connection point 16. The other ends of the spring connectors 24, 24 are arranged so that the radiation electrode 22 and the carrier 26 face the circuit board 20 so that they are elastically connected to the ground electrode 18 of the circuit board 20 and a power supply circuit (not shown) to be electrically connected. Fixed.
【００１４】かかる構成からなる本発明のアンテナにお
いて、図３に示すごとく、ＧＳＭの８８０〜９８０ＭＨ
ｚの周波数帯の範囲で、ＶＳＷＲは略２以下であり、ま
たＤＣＳの１７１０〜１８８０ＭＨｚの周波数帯の範囲
で、ＶＳＷＲは略２．５以下といずれも良好であり、そ
れぞれの周波数帯で周波数帯域幅の拡大が図られてい
る。そして、図４に示すスミスチャートのごとく、ＧＳ
ＭとＤＣＳの周波数帯でアンテナインピーダンスは５０
Ωに比較的に接近している。また、図５に示すごとく、
ＧＳＭに対する放射特性は、キャリア２６の表面側と裏
側に放射が認められるが、表面側への放射がより優れて
いる。そしてまた、図６に示すごとく、ＤＣＳに対する
放射特性は、キャリア２６の表面側への優れた放射特性
が認められる。そして、ＧＳＭとＤＣＳのそれぞれの周
波数帯に対して、図７に示すごとく、充分に良好な利得
が得られる。もって、アンテナとして周波数帯域幅の広
いものが得られ、特に携帯電話用の内蔵アンテナとして
好適である。In the antenna of the present invention having such a structure, as shown in FIG. 3, GSM 880-980MH is provided.
In the frequency band range of z, VSWR is approximately 2 or less, and in the frequency band range of DCS 1710 to 1880 MHz, VSWR is approximately 2.5 or less, which are all good. The width is being expanded. Then, as in the Smith chart shown in FIG.
Antenna impedance is 50 in the frequency band of M and DCS
It is relatively close to Ω. Also, as shown in FIG.
Regarding the radiation characteristics for GSM, radiation is recognized on the front side and the back side of the carrier 26, but the radiation to the front side is more excellent. Further, as shown in FIG. 6, the radiation characteristic with respect to DCS is excellent radiation characteristic to the surface side of the carrier 26. Then, for each of the GSM and DCS frequency bands, sufficiently good gain can be obtained as shown in FIG. Therefore, an antenna having a wide frequency bandwidth can be obtained, and it is particularly suitable as a built-in antenna for a mobile phone.
【００１５】ところで、本発明にあっては、放射電極の
開放端を給電点１４の近くに容量結合させることで、周
波数帯域幅の拡大が図られている。これは、開放端を給
電点１４に容量結合させると閉ループが形成され、ＶＳ
ＷＲ特性が平らに近くなり、周波数帯域幅も広くなる。
しかし、エネルギーがループを循環し、放射エネルギー
が減少し、損失が大きくなる。また、開放端が容量結合
されなければ、放射エネルギーが大きくなり損失は少な
いが、周波数帯域幅が狭くなる。そして、周波数帯域幅
の広さと損失すなわち利得が、開放端を容量結合させる
放射電極の位置に応じて相反して生じる。発明者らは、
かかる知見に基づき、ＶＳＷＲ３以下で所望の周波数帯
域幅でしかも利得がアンテナとして利用し得る条件とし
て、放射電極の先端の開放端を給電点１４から１／１６
〜１／８波長だけ離した位置の放射電極に容量結合すれ
ば良いことを実験により確認した。そして、開放端側と
給電点１４側の放射電極の対向する長さおよび間隔寸法
により結合容量値が変化し、結合容量値が大きいほど損
失の増大と周波数帯域幅の拡大する傾向にある。そこ
で、実験により適宜な対向長さと間隔寸法が設定されれ
ば良い。By the way, in the present invention, the frequency band width is expanded by capacitively coupling the open end of the radiation electrode near the feeding point 14. This is because when the open end is capacitively coupled to the feeding point 14, a closed loop is formed and VS
The WR characteristic becomes nearly flat and the frequency bandwidth becomes wider.
However, energy circulates in the loop, reducing radiant energy and increasing losses. Further, if the open end is not capacitively coupled, the radiated energy becomes large and the loss is small, but the frequency bandwidth becomes narrow. Then, the width of the frequency bandwidth and the loss, that is, the gain are contradictory to each other depending on the position of the radiation electrode that capacitively couples the open end. The inventors
Based on this knowledge, as a condition that the gain can be used as an antenna with a desired frequency bandwidth below VSWR3, the open end of the tip of the radiating electrode is 1/16 from the feeding point 14
It was confirmed by experiments that capacitive coupling to the radiation electrode at a position separated by ⅛ wavelength was sufficient. The coupling capacitance value changes depending on the lengths and intervals of the radiation electrodes on the open end side and the feeding point 14 side that face each other. The larger the coupling capacitance value, the larger the loss and the wider the frequency bandwidth. Therefore, it suffices to set appropriate facing lengths and spacing dimensions by experiments.
【００１６】また、給電点１４から両端側にある放射電
極部分は、スリット２２ｂにより互いに容量結合され
る。そして、この結合容量が大きいと、双方の共振周波
数がともに低下する傾向にあることを、実験から見い出
した。そこで、双方の放射電極部分による共振周波数の
調整に、スリット２２ｂによる容量値を調整して行うこ
とも可能である。Further, the radiation electrode portions on both ends of the feeding point 14 are capacitively coupled to each other by the slit 22b. Then, it was found from an experiment that when the coupling capacitance is large, both resonance frequencies tend to decrease. Therefore, it is also possible to adjust the capacitance value by the slit 22b to adjust the resonance frequency by both radiation electrode portions.
【００１７】そして、給電点１４から先端までの寸法が
長い側の放射電極部分の先端側に容量環を設けること
で、物理的に短い放射電極部分で、低い周波数帯を送受
信できるようにしている。また、先端までの寸法が短い
側の放射電極部分の給電点１４側の面積を大とすること
で、高い周波数帯の帯域幅の拡大を図っている。A capacitance ring is provided on the tip side of the radiation electrode portion whose length from the feeding point 14 to the tip is long, so that a physically short radiation electrode portion can transmit and receive a low frequency band. . Further, by increasing the area on the side of the feeding point 14 of the radiation electrode portion on the side where the dimension to the tip is short, the bandwidth of the high frequency band is expanded.
【００１８】さらに、上述のごとく、スリット２２ａ，
２２ｂ，２２ｃによる容量値により、放射電極部分の周
波数帯の帯域幅および共振周波数が変動する。そこで、
スリット２２ａ，２２ｂ，２２ｃの間隔は、精度が良く
安定していることが望ましい。そこで、上記実施例で
は、導電体板からプレス加工により精度良く放射電極２
２を形成し、これを金型に挿入してキャリア２６と一体
成形することで、スリット２２ａ，２２ｂ，２２ｃの間
隔が高い精度で固定される。もって、本発明のアンテナ
の特性が安定したものとなり、量産に好適である。Further, as described above, the slits 22a,
The bandwidth of the frequency band of the radiation electrode portion and the resonance frequency vary depending on the capacitance value of 22b and 22c. Therefore,
It is desirable that the intervals between the slits 22a, 22b, and 22c be accurate and stable. Therefore, in the above-described embodiment, the radiation electrode 2 is accurately formed by pressing a conductor plate.
By forming 2 and inserting this into a mold and integrally molding with the carrier 26, the intervals of the slits 22a, 22b, 22c are fixed with high accuracy. As a result, the antenna of the present invention has stable characteristics, which is suitable for mass production.
【００１９】そしてまた、給電点１４およびグランド電
極接続点１６に、スプリングコネクタ２４，２４の一端
が導電体板からなる放射電極２２に圧入またはカシメに
より固定されるとともに電気的接続されるので、従来の
回路基板２０の図示しない給電回路およびグランド電極
１８と放射電極２２の双方に、プランジャーを弾接させ
るスプリングコネクタによる接続構造と比較して、その
電気的特性がより安定している。また、スプリングコネ
クタに代えて、導電性板バネで電気的に接続する構造よ
りも、浮遊容量の発生がなく、しかも接触点が安定する
などから電気的特性が安定している。Further, since one ends of the spring connectors 24, 24 are press-fitted or fixed by caulking and electrically connected to the feeding point 14 and the ground electrode connecting point 16 to the radiating electrode 22 made of a conductor plate, the conventional structure is possible. The electrical characteristics of the circuit board 20 are more stable than those of the connection structure using a spring connector that elastically contacts the plunger to both the power supply circuit (not shown) and the ground electrode 18 and the radiation electrode 22. Further, instead of the spring connector, a floating capacitance is not generated, and the contact point is stable, as compared with the structure in which a conductive leaf spring is used for electrical connection, so that the electrical characteristics are stable.
【００２０】次に、図８に基づいて、本発明のアンテナ
の製造方法の一例を説明する。まず、図８（ａ）に示す
ごとく、導電体板のフープ材３０に放射電極２２をプレ
ス加工にて一部分を連結した状態で連続的に打ち抜き形
成する。そして、この放射電極２２が連続的に形成され
たフープ材３０を金型に挿入して、図８（ｂ）に示すご
とく、インサート成形により放射電極２２にそれぞれ絶
縁樹脂からなるキャリア２６を一体的に成形する。ここ
で、放射電極２２はキャリア２６に固定され、スリット
２２ａ，２２ｂ，２２ｃの間隔も精度良く固定されるこ
ととなる。さらに、図８（ｃ）に示すごとく、一体化さ
れたキャリア２６と放射電極２２の給電点１４とグラン
ド電極接続点１６に、スプリングコネクタ２４，２４の
一端が圧入または挿入してカシメられて固定されるとと
もに電気的接続される。その後、フープ材３０から放射
電極２２が完全に切り離されて、図８（ｄ）のごとき本
発明のアンテナが完成される。Next, an example of a method of manufacturing the antenna of the present invention will be described with reference to FIG. First, as shown in FIG. 8A, the radiation electrode 22 is continuously punched and formed on the hoop material 30 of the conductor plate in a state where a part of the radiation electrode 22 is connected by press working. Then, the hoop material 30 on which the radiation electrodes 22 are continuously formed is inserted into a mold, and as shown in FIG. 8B, the radiation electrodes 22 are integrally formed with carriers 26 made of an insulating resin by insert molding. To mold. Here, the radiation electrode 22 is fixed to the carrier 26, and the intervals of the slits 22a, 22b, and 22c are also fixed accurately. Further, as shown in FIG. 8C, one ends of the spring connectors 24, 24 are press-fitted or inserted into the integrated feeding point 14 of the radiating electrode 22 and the connecting point 16 of the ground electrode to be fixed by caulking. And is electrically connected. Then, the radiation electrode 22 is completely separated from the hoop material 30, and the antenna of the present invention as shown in FIG. 8D is completed.
【００２１】図８に示すごとき本発明のアンテナの製造
方法にあっては、製造工程を自動化することが容易であ
り、量産に好適である。しかも、自動化した製造ライン
は、汎用性に優れたものであり、金型などの交換によっ
て、簡単に他機種のアンテナをも製造することができ
る。また、アンテナを寸法精度高く生産でき、アンテナ
特性が安定している点から、量産に好適である。In the method of manufacturing an antenna of the present invention as shown in FIG. 8, the manufacturing process can be easily automated, which is suitable for mass production. Moreover, the automated production line has excellent versatility, and antennas of other models can be easily produced by exchanging molds and the like. Moreover, the antenna is suitable for mass production because it can be manufactured with high dimensional accuracy and the antenna characteristics are stable.
【００２２】なお、上記実施例では、ＧＳＭとＤＣＳの
２つの携帯電話の周波数帯を送受信できるアンテナを説
明したが、これに限られず、所望の１つの周波数帯のみ
を送受信するようにしても良い。かかる場合には、給電
点１４から一方の側の放射電極部分のみを形成し、この
片側の放射電極部分で所望の周波数帯を送受信できるよ
うにすれば良い。また２つの周波数帯は、ＧＳＭとＤＣ
Ｓに限られない。さらには、送受信できる周波数帯が携
帯電話機用の周波数帯に限られるものでもない。そし
て、３つ以上の周波数帯を送受信すべく、給電点１４か
ら３つ以上の放射電極部分が突出されるように形成され
ても良い。In the above embodiment, the antenna capable of transmitting and receiving the frequency bands of the two mobile phones GSM and DCS has been described, but the present invention is not limited to this, and only one desired frequency band may be transmitted and received. . In such a case, only the radiation electrode portion on one side from the feeding point 14 may be formed so that a desired frequency band can be transmitted and received by this radiation electrode portion on one side. The two frequency bands are GSM and DC.
It is not limited to S. Furthermore, the frequency band that can be transmitted and received is not limited to the frequency band for mobile phones. Further, in order to transmit / receive three or more frequency bands, three or more radiation electrode portions may be formed so as to protrude from the feeding point 14.
【００２３】さらに、放射電極２２は、導電体板をプレ
ス加工で打ち抜き形成されたものに限られず、キャリア
２６の上面に導電体薄膜を蒸着や樹脂メッキや印刷など
で形成しても良い。Further, the radiation electrode 22 is not limited to one formed by punching a conductor plate, and a conductor thin film may be formed on the upper surface of the carrier 26 by vapor deposition, resin plating, printing or the like.
【００２４】そして、給電点１４とグランド電極接続点
１６に圧入またはカシメにより一端が固定されたスプリ
ングコネクタ２４，２４…により電気的接続がなされる
ものに限られず、従来のごとき両端を弾接させるスプリ
ングコネクタを用いても良く、また一端側を回路基板２
０に半田付け固定されるスプリングコネクタを用いても
良く、さらには導電板バネを用いても良い。The electrical connection is not limited to the spring connectors 24, 24 ... One end of which is fixed to the feeding point 14 and the ground electrode connecting point 16 by press fitting or crimping, and both ends are elastically contacted as in the conventional case. A spring connector may be used, and the circuit board 2 is provided on one end side.
A spring connector soldered and fixed to 0 may be used, or a conductive plate spring may be used.
【００２５】[0025]
【発明の効果】以上説明したところから明らかなよう
に、本発明アンテナおよびアンテナの製造方法は、以下
のごとき格別な効果を奏する。As is apparent from the above description, the antenna of the present invention and the method of manufacturing the antenna have the following special effects.
【００２６】請求項１記載のアンテナにあっては、周波
数帯域幅が広いアンテナが得られる。そこで、１つの周
波数帯の帯域幅が広い携帯電話機用の内蔵アンテナとし
て好適である。According to the antenna of the first aspect, an antenna having a wide frequency bandwidth can be obtained. Therefore, it is suitable as a built-in antenna for a mobile phone having a wide bandwidth of one frequency band.
【００２７】請求項２記載のアンテナにあっては、２つ
の周波数帯でそれぞれに周波数帯域幅が広いアンテナが
得られる。そこで、２つの周波数帯を送受信する携帯電
話機用の内蔵アンテナとして好適である。According to the antenna of the second aspect, an antenna having a wide frequency bandwidth can be obtained in each of the two frequency bands. Therefore, it is suitable as a built-in antenna for a mobile phone that transmits and receives two frequency bands.
【００２８】請求項３記載のアンテナにあっては、給電
点から両端側の放射電極部分を部分的に平行として容量
結合しているので、この容量結合の容量値により双方の
放射電極部分で送受信できる周波数帯を調整することが
できる。In the antenna according to the third aspect, since the radiation electrode portions on both ends from the feeding point are partially parallel to each other and capacitively coupled, the capacitance value of this capacitive coupling allows transmission and reception at both radiation electrode portions. The frequency band that can be adjusted can be adjusted.
【００２９】請求項４記載のアンテナにあっては、放射
電極を面状としたので、それだけ周波数帯域幅の拡大が
図れる。In the antenna according to the fourth aspect, since the radiation electrode has a planar shape, the frequency bandwidth can be expanded accordingly.
【００３０】請求項５記載のアンテナにあっては、放射
電極の給電点およびグランド電極接続点にスプリングコ
ネクタの一端部を圧入またはカシメにより固定したの
で、電気的接続が確実になされ、アンテナ特性が安定す
る。In the antenna according to the fifth aspect, one end of the spring connector is press-fitted or crimped to the feeding point of the radiating electrode and the connecting point of the ground electrode, so that the electrical connection is made sure and the antenna characteristic is improved. Stabilize.
【００３１】請求項６記載のアンテナにあっては、長い
寸法の放射電極部分の先端に容量環を形成するので、長
い寸法の放射電極部分の物理的寸法を短くすることがで
きる。また、短い寸法の放射電極部分による周波数帯域
幅を拡大することができる。In the antenna according to the sixth aspect, since the capacitive ring is formed at the tip of the long radiating electrode portion, the physical size of the long radiating electrode portion can be shortened. Also, the frequency bandwidth can be expanded by the radiation electrode portion having a short size.
【００３２】請求項７記載のアンテナにあっては、導電
体板の打ち抜きにより放射電極を形成するので、その寸
法精度が優れている。しかも、放射電極にキャリアを一
体成型するので、放射電極がキャリアにより高い寸法精
度のまま固定される。もって、アンテナ特性が安定して
おり、量産に好適である。In the antenna according to the seventh aspect, since the radiation electrode is formed by punching out the conductor plate, the dimensional accuracy is excellent. Moreover, since the carrier is integrally molded with the radiation electrode, the radiation electrode is fixed to the carrier with high dimensional accuracy. Therefore, the antenna characteristics are stable and suitable for mass production.
【００３３】請求項８記載のアンテナの製造方法にあっ
ては、製造工程の自動化が容易であり、量産に好適であ
る。According to the antenna manufacturing method of the eighth aspect, the manufacturing process can be easily automated, which is suitable for mass production.
【図１】本発明のアンテナの外観図であり、（ａ）は平
面図、（ｂ）は側面図、（ｃ）は正面図である。FIG. 1 is an external view of an antenna of the present invention, (a) is a plan view, (b) is a side view, and (c) is a front view.
【図２】放射電極にスプリングコネクタの一端部を圧入
した構造を示す断面図である。FIG. 2 is a cross-sectional view showing a structure in which one end of a spring connector is press-fitted into a radiation electrode.
【図３】本発明のアンテナの周波数対ＶＳＷＲ特性図で
ある。FIG. 3 is a frequency vs. VSWR characteristic diagram of the antenna of the present invention.
【図４】本発明のアンテナのスミスチャートである。FIG. 4 is a Smith chart of the antenna of the present invention.
【図５】ＧＳＭの周波数帯の各周波数における放射特性
図であり、（ａ）は８８０ＭＨｚ、（ｂ）は９１５ＭＨ
ｚ、（ｃ）は９２５ＭＨｚ、（ｄ）９６０ＭＨｚであ
る。FIG. 5 is a radiation characteristic diagram at each frequency in the GSM frequency band, in which (a) is 880 MHz and (b) is 915 MH.
z and (c) are 925 MHz and (d) 960 MHz.
【図６】ＤＣＳの周波数帯の各周波数における放射特性
図であり、（ａ）は１７１０ＭＨｚ、（ｂ）は１７８５
ＭＨｚ、（ｃ）は１８０５ＭＨｚ、（ｄ）は１８８０Ｍ
Ｈｚである。FIG. 6 is a radiation characteristic diagram at each frequency in the frequency band of DCS, where (a) is 1710 MHz and (b) is 1785.
MHz, (c) is 1805 MHz, (d) is 1880 M
Hz.
【図７】本発明のアンテナの各周波数における最大利得
と平均利得の表である。FIG. 7 is a table of maximum gain and average gain at each frequency of the antenna of the present invention.
【図８】本発明のアンテナの製造方法の工程を示す図で
あり、（ａ）はフープ材に放射電極を打ち抜い図、
（ｂ）は打ち抜いた放射電極にキャリアをインサート成
形した図、（ｃ）は放射電極とキャリアの一体物にスプ
リングコネクタを圧入した図、（ｄ）は放射電極をフー
プ材から切り離してアンテナとした図である。FIG. 8 is a diagram showing steps of the method for manufacturing an antenna of the present invention, FIG. 8A is a diagram in which a radiation electrode is punched out on a hoop material,
(B) is a figure in which a carrier is insert-molded into a punched radiation electrode, (c) is a figure in which a spring connector is press-fitted into an integrated body of the radiation electrode and the carrier, and (d) is an antenna in which the radiation electrode is separated from the hoop material. It is a figure.
【図９】従来のアンテナの一例の平面図である。FIG. 9 is a plan view of an example of a conventional antenna.
【図１０】図９のＡ−Ａ断面拡大図である。10 is an enlarged view taken along the line AA of FIG.
１０，２６ キャリア １２，２２ 放射電極 １４ 給電点 １６ グランド電極接続点 １８ グランド電極 ２０ 回路基板 ２４ スプリングコネクタ ３０ フープ材 10,26 career 12,22 Radiation electrode 14 feeding points 16 Ground electrode connection point 18 ground electrode 20 circuit board 24 spring connector 30 hoop material
───────────────────────────────────────────────────── フロントページの続き (72)発明者 坂野 浩正 群馬県富岡市神農原1112番地 株式会社ヨ コオ富岡工場内 Ｆターム(参考） 5E077 BB33 CC22 DD17 FF19 GG17 JJ21 5J021 AA01 AB06 DB07 HA10 JA02 JA03 JA07 5J045 AA01 AA02 AA03 AB05 BA01 DA09 GA01 HA02 JA11 MA01 NA03 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Hiromasa Sakano 1112 Shinnohara, Tomioka City, Gunma Yo Co., Ltd. Koo Tomioka Factory F term (reference) 5E077 BB33 CC22 DD17 FF19 GG17 JJ21 5J021 AA01 AB06 DB07 HA10 JA02 JA03 JA07 5J045 AA01 AA02 AA03 AB05 BA01 DA09 GA01 HA02 JA11 MA01 NA03
Claims (8)
配設し、前記放射電極の一端部に給電点とグランド電極
接続点とを設けるとともに他端部を開放端とするアンテ
ナにおいて、前記放射電極を折り返して前記開放端を前
記給電点から送受信周波数帯の１／１６〜１／８波長離
した前記放射電極の位置に容量結合するように構成した
ことを特徴とするアンテナ。1. An antenna in which a radiation electrode is arranged apart from a ground electrode, a feeding point and a ground electrode connection point are provided at one end of the radiation electrode, and the other end is an open end. An antenna characterized in that the electrode is folded back and the open end is capacitively coupled to a position of the radiating electrode which is separated from the feeding point by 1/16 to 1/8 wavelength of a transmission / reception frequency band.
配設し、前記放射電極の一方に偏った中間部に給電点と
グランド電極接続点とを設けるとともに両端部を開放端
として２つの周波数帯を送受信するアンテナにおいて、
前記放射電極の両端側をそれぞれに折り返して、それぞ
れの前記開放端を前記給電点から当該開放端側の放射電
極部分で送受信する周波数帯の１／１６〜１／８波長離
した前記放射電極部分の位置にそれぞれに容量結合する
ように構成したことを特徴とするアンテナ。2. A radiation electrode is disposed apart from the ground electrode, a feeding point and a ground electrode connection point are provided at an intermediate portion that is biased to one side of the radiation electrode, and both frequencies are two open frequencies. In the antenna that transmits and receives the band,
Both ends of the radiating electrode are folded back to each other, and the radiating electrode portions are separated by 1/16 to ⅛ wavelength of the frequency band for transmitting and receiving the open ends from the feeding point to the radiating electrode portion on the open end side. An antenna characterized by being capacitively coupled to each position.
給電点から両端側の放射電極部分を部分的に平行に配設
して容量結合するように構成したことを特徴とするアン
テナ。3. The antenna according to claim 2, wherein the radiation electrode portions on both end sides of the feeding point are arranged in parallel so as to be capacitively coupled.
テナにおいて、前記放射電極を、導電体板または導電体
薄膜で面状に構成したことを特徴とするアンテナ。4. The antenna according to any one of claims 1 to 3, wherein the radiation electrode is formed in a planar shape with a conductor plate or a conductor thin film.
て、前記放射電極を導電体板で形成し、前記給電点およ
びグランド電極接続点でそれぞれにスプリングコネクタ
の一端部を前記導電体板に圧入またはカシメにより固定
するとともに電気的接続して構成したことを特徴とする
アンテナ。5. The antenna according to claim 1, wherein the radiation electrode is formed of a conductor plate, and one end of a spring connector is press-fitted into the conductor plate at the feeding point and the ground electrode connection point, respectively. An antenna characterized by being fixed by crimping and electrically connected.
放射電極を導電体板または導電体薄膜で面状に形成し、
前記給電点から開放端までの寸法が長い側の放射電極部
分の先端側の面積を大として容量環とし、前記給電点か
ら開放端までの寸法が短い側の放射電極部分の給電点側
の面積を大として構成したことを特徴とするアンテナ。6. The antenna according to claim 2, wherein the radiating electrode is formed in a planar shape by a conductor plate or a conductor thin film,
The area on the feeding point side of the radiation electrode portion on the short side from the feeding point to the open end is a capacitance ring by increasing the area on the tip side of the radiation electrode portion on the long side from the feeding point to the open end. An antenna characterized by having a large size.
テナにおいて、前記放射電極を導電体板の打ち抜きによ
り形成し、当該放射電極に絶縁樹脂からなるキャリアを
一体成形して構成したことを特徴とするアンテナ。7. The antenna according to claim 1, wherein the radiation electrode is formed by punching a conductor plate, and a carrier made of an insulating resin is integrally molded with the radiation electrode. And the antenna.
記載の放射電極を一部分を連結して打ち抜き形成し、こ
のフープ材を金型にインサートして前記放射電極に絶縁
樹脂材からなるキャリアをそれぞれにインサート成形
し、さらに前記キャリアと一体化された前記放射電極の
給電点およびグランド電極接続点にスプリングコネクタ
の一端部を圧入固定し、その後、前記放射電極を前記フ
ープ材から切り離すことを特徴としたアンテナの製造方
法。8. The hoop material for a conductor plate according to claim 1 or 2.
The radiation electrodes according to the description are formed by punching by connecting a part of them, and the hoop material is inserted into a mold to insert-mold a carrier made of an insulating resin material into each of the radiation electrodes, and the carrier integrated with the carrier is formed. A method for manufacturing an antenna, characterized in that one end of a spring connector is press-fitted and fixed to a feeding point and a ground electrode connecting point of a radiation electrode, and then the radiation electrode is separated from the hoop material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001210215A JP4798738B2 (en) | 2001-07-11 | 2001-07-11 | Antenna and method for manufacturing antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001210215A JP4798738B2 (en) | 2001-07-11 | 2001-07-11 | Antenna and method for manufacturing antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003023316A true JP2003023316A (en) | 2003-01-24 |
| JP4798738B2 JP4798738B2 (en) | 2011-10-19 |
Family
ID=19045715
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001210215A Expired - Fee Related JP4798738B2 (en) | 2001-07-11 | 2001-07-11 | Antenna and method for manufacturing antenna |
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| Country | Link |
|---|---|
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1093332A (en) * | 1996-09-13 | 1998-04-10 | Nippon Antenna Co Ltd | Dual resonance inverted-f shape antenna |
| JPH11251825A (en) * | 1998-03-03 | 1999-09-17 | Kenwood Corp | Multi-ple frequency resonance-type inverted f-type antenna |
| JP2000068736A (en) * | 1998-08-21 | 2000-03-03 | Toshiba Corp | Multi-frequency antenna |
| JP2000151262A (en) * | 1998-08-05 | 2000-05-30 | Furukawa Electric Co Ltd:The | Small-sized antenna |
| JP2001156513A (en) * | 1999-11-29 | 2001-06-08 | Yokowo Co Ltd | Chip antenna mount structure |
| JP2002185239A (en) * | 2000-10-27 | 2002-06-28 | Nokia Mobile Phones Ltd | Antenna structure and wireless installation |
| JP2002368850A (en) * | 2001-06-05 | 2002-12-20 | Sony Corp | Portable wireless terminal |
-
2001
- 2001-07-11 JP JP2001210215A patent/JP4798738B2/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1093332A (en) * | 1996-09-13 | 1998-04-10 | Nippon Antenna Co Ltd | Dual resonance inverted-f shape antenna |
| JPH11251825A (en) * | 1998-03-03 | 1999-09-17 | Kenwood Corp | Multi-ple frequency resonance-type inverted f-type antenna |
| JP2000151262A (en) * | 1998-08-05 | 2000-05-30 | Furukawa Electric Co Ltd:The | Small-sized antenna |
| JP2000068736A (en) * | 1998-08-21 | 2000-03-03 | Toshiba Corp | Multi-frequency antenna |
| JP2001156513A (en) * | 1999-11-29 | 2001-06-08 | Yokowo Co Ltd | Chip antenna mount structure |
| JP2002185239A (en) * | 2000-10-27 | 2002-06-28 | Nokia Mobile Phones Ltd | Antenna structure and wireless installation |
| JP2002368850A (en) * | 2001-06-05 | 2002-12-20 | Sony Corp | Portable wireless terminal |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4798738B2 (en) | 2011-10-19 |
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