JP3165005B2 - Portable radio - Google Patents
Portable radioInfo
- Publication number
- JP3165005B2 JP3165005B2 JP16312395A JP16312395A JP3165005B2 JP 3165005 B2 JP3165005 B2 JP 3165005B2 JP 16312395 A JP16312395 A JP 16312395A JP 16312395 A JP16312395 A JP 16312395A JP 3165005 B2 JP3165005 B2 JP 3165005B2
- Authority
- JP
- Japan
- Prior art keywords
- antenna
- parasitic element
- shaped
- wireless device
- plate
- 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.)
- Expired - Fee Related
Links
Landscapes
- Support Of Aerials (AREA)
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、携帯電話，自動車電話
などの携帯無線機に関し、特に、板状逆Ｆ形アンテナが
内蔵された携帯無線機に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable radio such as a portable telephone and a car telephone, and more particularly to a portable radio having a built-in inverted F-shaped antenna.
【０００２】[0002]
【従来の技術】携帯電話，自動車電話などの携帯無線機
の小型化に伴ってアンテナに対する小型化が要求され、
板状逆Ｆ形アンテナが多く用いられるようになった。2. Description of the Related Art With the miniaturization of portable radios such as cellular phones and car phones, miniaturization of antennas is required.
Plate-shaped inverted-F antennas have come to be widely used.
【０００３】図５は平板状逆Ｆアンテナの構造を示す平
面図（Ａ）と側面図（Ｂ）であり、図６はその特性例図
である。図５において、１はアンテナエレメント、２は
短絡面、３は地板、４は給電線路、ａはアンテナエレメ
ント１の長さでほぼλ／４の長さに設定される。ｂはア
ンテナエレメント１の幅であり、ｄはエレメント１と地
板３との間隙である。FIG. 5 is a plan view (A) and a side view (B) showing the structure of a flat inverted-F antenna, and FIG. 6 is a graph showing an example of characteristics thereof. In FIG. 5, reference numeral 1 denotes an antenna element, 2 denotes a short-circuit plane, 3 denotes a ground plane, 4 denotes a feed line, and a denotes the length of the antenna element 1 and is set to approximately λ / 4. b is the width of the antenna element 1, and d is the gap between the element 1 and the ground plane 3.
【０００４】図６の横軸は波長λ0 に対する間隙ｄの割
合を示し、アンテナエレメント１の幅と長さの比：Ａｓ
＝ｂ／ａをパラメータとした放射効率ηと帯域幅ＢＷの
特性例図である。[0006] The horizontal axis of FIG. 6 shows the ratio of the gap d to the wavelength λ 0 , and the ratio of the width to the length of the antenna element 1: As
FIG. 6 is a characteristic example diagram of the radiation efficiency η and the bandwidth BW using = b / a as a parameter.
【０００５】しかし、この板状逆Ｆ形アンテナにおいて
も、小型化には、その帯域幅や寸法，構造に対する問題
点がある。例えば、ディジタルセルラーホンの受信ダイ
バーシティ用に内蔵される板状逆Ｆ形アンテナの場合、
基本的なアンテナエレメント１の長さａ＝λ／４は約９
ｃｍ程度必要になる。しかし、小型化された現在の携帯
電話機は体積が１５０ｃｃ程度であり、内蔵アンテナに
許される体積は数ｃｃとなる。一方、図６に示したよう
に、帯域幅（ＢＷ）を広くするには、間隙ｄを大きく
し、Ａｓ＝ｂ／ａを大きくした方がよい。さらに、地板
３がエレメント１に対して十分広くないと帯域幅が狭く
なる。[0005] However, even in the case of the plate-shaped inverted-F antenna, there is a problem in terms of its bandwidth, dimensions, and structure in miniaturization. For example, in the case of a plate-shaped inverted-F antenna built in for reception diversity of a digital cellular phone,
The length a = λ / 4 of the basic antenna element 1 is about 9
cm is required. However, the size of a downsized current mobile phone is about 150 cc, and the volume allowed for the built-in antenna is several cc. On the other hand, as shown in FIG. 6, in order to increase the bandwidth (BW), it is better to increase the gap d and increase As = b / a. Further, if the ground plane 3 is not sufficiently wide with respect to the element 1, the bandwidth is narrowed.
【０００６】[0006]
【発明が解決しようとする課題】上述のように、従来の
携帯電話機では、先ず筐体の外形寸法が決められ、その
中に無線機のＲＦ部（高周波回路部），ロジック部，電
池などを配置した後の残りの数ｃｃが内蔵アンテナに許
される体積となるため、アンテナエレメント１の長さ
ａ，幅ｂ，間隙ｄの最大値が制限をうけることになる。
そのため、実際には、アンテナエレメント１の長さａを
λ／４にすることが難しいので、短絡面制御や、容量を
付加したり、間隙に誘電体を設けて波長短縮を図ってア
ンテナ共振周波数を帯域の中心周波数と一致させる工夫
をしている。しかし、放射効率を下げずに帯域幅を広げ
る改善策はなく、結果として、通常、量産設計の際に考
慮しなければならない製品のばらつきに対する設計マー
ジン（余裕）が設定できず、製作仕様を極めて高精度に
して製品ばらつきを抑えたり、検査，調整工程によって
特性を確保しているため、原価が上昇し、生産性が悪い
等の問題がある。As described above, in the conventional portable telephone, first, the outer dimensions of the housing are determined, and the RF unit (high-frequency circuit unit), the logic unit, the battery, and the like of the wireless device are included therein. Since the remaining several cc after the arrangement is the volume allowed for the built-in antenna, the maximum values of the length a, the width b, and the gap d of the antenna element 1 are limited.
Therefore, in practice, it is difficult to set the length a of the antenna element 1 to λ / 4, so that the antenna resonance frequency can be reduced by controlling the short-circuit surface, adding a capacitor, or providing a dielectric in the gap to shorten the wavelength. To match the center frequency of the band. However, there is no improvement measure to increase the bandwidth without lowering the radiation efficiency. As a result, usually, a design margin (margin) for product variation that must be considered in mass production design cannot be set, and the production specification is extremely low. Since the characteristics are ensured by high accuracy to suppress the product variation and the inspection and adjustment processes, there are problems such as an increase in cost and poor productivity.
【０００７】本発明の目的は、内蔵アンテナの小型化に
伴う帯域幅の低下を改善し、設計，製造マージンを確保
することにより、原価の低減と生産性の向上を図った携
帯無線機を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a portable radio device in which cost reduction and productivity are improved by improving a decrease in bandwidth due to miniaturization of a built-in antenna and securing a design and manufacturing margin. Is to do.
【０００８】[0008]
【課題を解決するための手段】本発明の携帯無線機は、
無線機回路と、該無線機回路が収容された地板と、板状
逆Ｆ形アンテナのアンテナエレメントとが絶縁性筐体に
内蔵され、該筐体の内側または外側に導電性の無給電素
子が備えられた携帯無線機であって、 前記無給電素子
は、２つの面部分が幅の狭い線状部分によって連結され
た形状を有し、前記板状逆Ｆ形アンテナのアンテナエレ
メントと中心がほぼ一致する位置に対応して設置された
ことを特徴とするものである。 A portable wireless device according to the present invention comprises:
A radio circuit, a base plate containing the radio circuit,
Antenna element of inverted F type antenna is insulated housing
Built-in conductive parasitic element inside or outside the housing
A child provided portable radio, said parasitic element
Has two face parts connected by a narrow linear part
Antenna element of the plate-shaped inverted F-shaped antenna
It is installed corresponding to the position where the center almost matches the
It is characterized by the following.
【０００９】さらに、前記無給電素子は、導電体の片面
粘着テープで形成されているか、または、導電塗料で形
成されていることを特徴とするものである。 Further, the parasitic element may be a single-sided conductor.
Formed with adhesive tape or formed with conductive paint
It is characterized by having been done.
【００１０】[0010]
【実施例】図１は本発明の実施例を示す構造図であり、
（Ａ）は部分切断断面図、（Ｂ）は背面図である。図に
おいて、内蔵アンテナとなる板状逆Ｆ形アンテナは、ア
ンテナエレメント１，短絡面２，地板３，給電線路４に
よって構成され、地板３は、無線機回路を収容し電磁遮
蔽するシールドケースを兼用している。５はＡＢＳ樹脂
などのプラスチックの筐体、６は本発明の要部をなす無
給電素子、７は電池である。FIG. 1 is a structural view showing an embodiment of the present invention.
(A) is a partially cutaway sectional view, and (B) is a rear view. In the figure, a plate-shaped inverted-F antenna serving as a built-in antenna is constituted by an antenna element 1, a short-circuit surface 2, a ground plane 3, and a feed line 4, and the ground plane 3 also serves as a shield case for housing a radio device circuit and shielding electromagnetically. are doing. Reference numeral 5 denotes a case made of a plastic such as ABS resin, reference numeral 6 denotes a parasitic element which is a main part of the present invention, and reference numeral 7 denotes a battery.
【００１１】無給電素子６は、使用周波数帯で低損失の
導電テープ，導電塗装などの導体で形成され、例えば、
銀製の片面粘着テープが用いられ、無線機の背面の筐体
５の表側または内側の内蔵する板状逆Ｆ形アンテナのア
ンテナエレメント１と対応する位置に貼り付けられてい
る。その形状は、図１（Ｂ）及び図２に示したように、
内側の角部が削られた２つの方形状の面部分を幅の狭い
線状部分で連結した形を有している。図１（Ｂ）に示し
たように、無給電素子６の貼り付け位置を内蔵アンテナ
のアンテナエレメント１と中心がほぼ一致するようにす
ると、アンテナ共振周波数を変化させることなく、放射
効率を低下させることなく、帯域幅を広くすることがで
きる。無給電素子６を上の方へずらして貼るとアンテナ
共振周波数が高くなり、下の方へずらして貼ると低くな
る。また、図２に示したように、面部分は容量性を示し
線状部分は誘導性を示すので、上述の貼り付け位置と、
面部分の面積や線部分の長さ，幅を実験的に求めて設定
することにより、共振周波数と放射効率を変えることな
く広帯域化を実現することができる。The parasitic element 6 is formed of a conductor such as a conductive tape or a conductive paint which has a low loss in the operating frequency band.
A silver single-sided adhesive tape is used and attached to a position corresponding to the antenna element 1 of the built-in inverted F-shaped antenna inside the front or inside of the housing 5 on the back of the radio. As shown in FIG. 1 (B) and FIG.
It has a shape in which two rectangular surface portions whose inner corners are cut are connected by a narrow linear portion. As shown in FIG. 1B, when the attachment position of the parasitic element 6 is set to be substantially coincident with the center of the antenna element 1 of the built-in antenna, the radiation efficiency is reduced without changing the antenna resonance frequency. Without increasing the bandwidth. The antenna resonance frequency increases when the parasitic element 6 is displaced upward, and decreases when the parasitic element 6 is displaced downward. Further, as shown in FIG. 2, the surface portion shows capacitive and the linear portion shows inductive.
By experimentally obtaining and setting the area of the surface portion and the length and width of the line portion, it is possible to realize a wide band without changing the resonance frequency and the radiation efficiency.
【００１２】図２は本発明の無給電素子６の具体例を示
す平面図であり、図３は本発明による帯域幅の改善を示
す特性例図、図４は本発明実施前後の放射特性例図であ
る。図３から判るように、反射量が−１０ｄＢにおける
帯域幅は、従来の特性ａに比べて本発明の無給電素子６
を設けた特性ｂは約１０％広くなっている。さらに、図
４の特性ａ，ｂは携帯無線機を９０°方向を変えたとき
の特性を示し、それぞれ無給電素子６のある場合とない
場合について特性が変わらないことを示している。FIG. 2 is a plan view showing a specific example of the parasitic element 6 of the present invention, FIG. 3 is a characteristic example showing the improvement of the bandwidth according to the present invention, and FIG. 4 is an example of the radiation characteristic before and after implementing the present invention. FIG. As can be seen from FIG. 3, the bandwidth when the reflection amount is −10 dB is smaller than that of the characteristic a in the related art.
Is wider by about 10%. Further, the characteristics a and b in FIG. 4 show the characteristics when the portable wireless device is changed in the 90 ° direction, and show that the characteristics do not change with and without the parasitic element 6, respectively.
【００１３】[0013]
【発明の効果】以上詳細に説明したように、本発明を実
施することにより、内蔵アンテナの共振周波数に影響を
及ぼすことなく、放射特性を低下させることなく、帯域
幅を広くすることができるので、設計，製造マージンを
増やすことができ、生産性の向上を図ることができる。
さらに、付加する無給電素子６は材料費が安く、加工も
容易なので総合的に原価を低減することができる。As described in detail above, by practicing the present invention, the bandwidth can be widened without affecting the resonance frequency of the built-in antenna and without deteriorating the radiation characteristics. In addition, the design and manufacturing margins can be increased, and the productivity can be improved.
Furthermore, the added parasitic element 6 has a low material cost and is easy to process, so that the total cost can be reduced.
【図１】本発明の実施例を示す構造図である。FIG. 1 is a structural diagram showing an embodiment of the present invention.
【図２】本発明の要部の具体例図である。FIG. 2 is a diagram showing a specific example of a main part of the present invention.
【図３】本発明の効果を示す帯域幅改善特性例図であ
る。FIG. 3 is an example of a bandwidth improvement characteristic showing the effect of the present invention.
【図４】本発明実施前後の放射特性例図である。FIG. 4 is a diagram showing an example of radiation characteristics before and after implementation of the present invention.
【図５】平板状逆Ｆアンテナの構造例図である。FIG. 5 is a structural example diagram of a flat inverted F antenna.
【図６】平板状逆Ｆアンテナの特性例図である。FIG. 6 is a diagram illustrating an example of characteristics of a flat inverted-F antenna.
１ アンテナエレメント ２ 短絡面 ３ 地板 ４ 給電線路 ５ 筐体 ６ 無給電素子 ７ 電池 DESCRIPTION OF SYMBOLS 1 Antenna element 2 Short-circuit surface 3 Ground plane 4 Feeding line 5 Housing 6 Parasitic element 7 Battery
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭62−171206（ＪＰ，Ａ) 特開 昭62−277803（ＪＰ，Ａ) 特開 平８−195609（ＪＰ，Ａ) 実開 平４−103006（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) H01Q 1/24 H04B 1/00 - 1/38 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-171206 (JP, A) JP-A-62-277803 (JP, A) JP-A-8-195609 (JP, A) 103006 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) H01Q 1/24 H04B 1/00-1/38
Claims (3)
た地板と、板状逆Ｆ形アンテナのアンテナエレメントと
が絶縁性筐体に内蔵され、該筐体の内側または外側に導
電性の無給電素子が備えられた携帯無線機であって、 前記無給電素子は、２つの面部分が幅の狭い線状部分に
よって連結された形状を有し、前記板状逆Ｆ形アンテナ
のアンテナエレメントと中心がほぼ一致する位置に対応
して設置されたことを特徴とする携帯無線機。 1. A radio circuit and a radio circuit accommodated therein.
Ground plate and the antenna element of the plate-shaped inverted F-shaped antenna
Is housed in an insulative housing and is guided inside or outside the housing.
A portable wireless device provided with an electrically conductive parasitic element, wherein the parasitic element has two surface portions formed into a narrow linear portion.
Therefore, the plate-shaped inverted F-shaped antenna has a connected shape.
Corresponds to the position where the center almost coincides with the antenna element of
A portable wireless device characterized by being installed as a mobile device.
ープで形成されたことを特徴とする請求項１記載の携帯
無線機。 2. The parasitic element according to claim 1, wherein the parasitic element is a single-sided adhesive tape of a conductor.
The mobile phone according to claim 1, wherein the mobile phone is formed of a loop.
transceiver.
たことを特徴とする請求項１記載の携帯無線機。 3. The passive element is made of a conductive paint.
The portable wireless device according to claim 1, wherein:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16312395A JP3165005B2 (en) | 1995-06-07 | 1995-06-07 | Portable radio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16312395A JP3165005B2 (en) | 1995-06-07 | 1995-06-07 | Portable radio |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08335818A JPH08335818A (en) | 1996-12-17 |
| JP3165005B2 true JP3165005B2 (en) | 2001-05-14 |
Family
ID=15767626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16312395A Expired - Fee Related JP3165005B2 (en) | 1995-06-07 | 1995-06-07 | Portable radio |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3165005B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI104662B (en) * | 1997-04-11 | 2000-04-14 | Nokia Mobile Phones Ltd | Antenna arrangement for small radio communication devices |
| JP2001251118A (en) | 2000-03-07 | 2001-09-14 | Nec Corp | Portable radio equipment |
| JP2003110329A (en) * | 2001-07-25 | 2003-04-11 | Matsushita Electric Ind Co Ltd | Built-in antenna device |
| JP4378378B2 (en) * | 2006-12-12 | 2009-12-02 | アルプス電気株式会社 | Antenna device |
| JP4814804B2 (en) * | 2007-01-17 | 2011-11-16 | シャープ株式会社 | Mobile radio communication device |
| JP6611165B2 (en) * | 2015-09-25 | 2019-11-27 | Ｆｄｋ株式会社 | Antenna device |
| WO2024010006A1 (en) * | 2022-07-06 | 2024-01-11 | Ａｇｃ株式会社 | Antenna and vehicular antenna device |
-
1995
- 1995-06-07 JP JP16312395A patent/JP3165005B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08335818A (en) | 1996-12-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |