JPS638655B2 - - Google Patents
Info
- Publication number
- JPS638655B2 JPS638655B2 JP57186702A JP18670282A JPS638655B2 JP S638655 B2 JPS638655 B2 JP S638655B2 JP 57186702 A JP57186702 A JP 57186702A JP 18670282 A JP18670282 A JP 18670282A JP S638655 B2 JPS638655 B2 JP S638655B2
- Authority
- JP
- Japan
- Prior art keywords
- antenna
- inverted
- housing
- shaped antenna
- receiver
- 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
Links
- 239000004020 conductor Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 230000010287 polarization Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 241000282412 Homo Species 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000005404 monopole Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/273—Adaptation for carrying or wearing by persons or animals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/03—Constructional details, e.g. casings, housings
- H04B1/034—Portable transmitters
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Structure Of Receivers (AREA)
- Details Of Aerials (AREA)
- Support Of Aerials (AREA)
- Transceivers (AREA)
Description
【発明の詳細な説明】
（技術分野）
本発明は、無線機本体に内蔵することの可能な
アンテナを取付けた携帯無線機に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a portable radio device equipped with an antenna that can be built into the main body of the radio device.
（背景技術）
従来、人間が携行して使用する小形携帯無線機
のアンテナとしては、通常第１図に示すような1/
４波長ホイツプアンテナ１が用いられていた。な
お第１図において、２は無線機の筐体、３は受話
器、４は送話器である。(Background Art) Conventionally, the antenna of a small portable radio device carried and used by humans is usually a 1/2 antenna as shown in Figure 1.
A four-wavelength whip antenna 1 was used. In FIG. 1, 2 is a housing of the radio, 3 is a receiver, and 4 is a transmitter.
しかしながら、上記アンテナは、アンテナ素子
が筐体上面に突出するため、操作時に破損しやす
く、無線機の信頼度を下げる大きな要素となつて
いた。 However, since the antenna element protrudes from the top surface of the casing, the antenna is easily damaged during operation, which is a major factor in lowering the reliability of the radio device.
このようなホイツプアンテナの欠点を補うアン
テナとして、板状素子を用いた逆Ｆ形アンテナが
知られている。第２図は逆Ｆ形アンテナを実装し
た携帯無線機の構成を示す図である。第２図にお
いて、５は筐体、６は受話器、７は送話器、８は
板状導体、９は接地部導体、１０は給電部を示
す。 An inverted F-shaped antenna using a plate element is known as an antenna that compensates for the drawbacks of the whip antenna. FIG. 2 is a diagram showing the configuration of a portable radio device equipped with an inverted F-shaped antenna. In FIG. 2, 5 is a housing, 6 is a receiver, 7 is a transmitter, 8 is a plate conductor, 9 is a ground conductor, and 10 is a power supply section.
逆Ｆ形アンテナは第３図に示すように、変形逆
Ｌ形アンテナであつて、高さを低くした逆Ｌ形ア
ンテナの入力抵抗は極めて低いため、アンテナ先
端部と接地部との間に給電点を設けて、インピー
ダンス整合を行なうようにしたものである。第３
図において、１１はアンテナ素子、１２は給電
部、１３は接地部、１４は地板を示している。第
２図に示した逆Ｆ形アンテナ素子は、アンテナ素
子部が導体板で構成されているが、このような構
成にした場合には、接地部９で構成される微小モ
ノポールモードと、導体板８と筐体５で構成され
るスロツトモードの両モードに分解して動作が説
明され、第３図のように無線機の頂部に配置され
た場合、水平面内において、モノポールモードで
垂直偏波成分を、スロツトモードで水平偏波成分
を送受信できることになることが知られている。 As shown in Figure 3, the inverted F-shaped antenna is a modified inverted L-shaped antenna, and since the input resistance of the inverted L-shaped antenna with a reduced height is extremely low, the power is fed between the tip of the antenna and the ground. A point is provided to perform impedance matching. Third
In the figure, 11 is an antenna element, 12 is a power feeding section, 13 is a grounding section, and 14 is a ground plane. In the inverted F-shaped antenna element shown in FIG. The operation is explained by breaking it down into two modes, the slot mode, which is made up of the plate 8 and the casing 5. When placed at the top of the radio as shown in Figure 3, vertically polarized waves are generated in the monopole mode in the horizontal plane. It is known that horizontally polarized components can be transmitted and received in slot mode.
携帯無線機では、筐体を傾け、受話器を耳にあ
てて使用することが多く、また反射の多い市街地
で使用する場合は偏波面の回転が生じるから、水
平・垂直両偏波成分を送受信できることが望まし
い。従つて、第２図に示すような逆Ｆ形アンテナ
は、前記ホイツプアンテナと比較するとアンテナ
高が低く、しかも水平・垂直両偏波成分に感度を
有するので、携帯機により適したアンテナであ
る。 Portable radios are often used by tilting the case and holding the receiver to the ear, and when used in urban areas where there are many reflections, the plane of polarization rotates, so it is necessary to be able to transmit and receive both horizontal and vertical polarization components. is desirable. Therefore, the inverted F-shaped antenna as shown in FIG. 2 has a lower antenna height than the whip antenna and is sensitive to both horizontal and vertical polarization components, making it more suitable for portable devices.
従来、この種の逆Ｆ形アンテナは、アンテナ位
置を、使用時にできるだけ地面から高くするため
に無線機頂部にアンテナを置き、かつ受話器部に
耳をつけたときアンテナインピーダンスの変動が
少ないように、接地部を受話器側に近付けて配置
されていた。 Conventionally, this type of inverted F-shaped antenna was placed on the top of the radio in order to raise the antenna position as high as possible from the ground during use, and to minimize fluctuations in antenna impedance when the receiver was placed in the ear. The grounding part was placed close to the receiver side.
しかしながら、このように配置した逆Ｆ形アン
テナでは、輻射に最も寄与する接地部が人体に近
付くため、実際の使用時には、自由空間で測定し
た利得と比較して実効利得が大幅に低下するとい
う欠点があつた。 However, with an inverted F-shaped antenna arranged in this way, the grounding part that contributes most to radiation is closer to the human body, so in actual use, the disadvantage is that the effective gain is significantly lower than the gain measured in free space. It was hot.
第４図は、従来の配置による逆Ｆ形アンテナの
特性を920MHzで実測したデータを示している。
第４図ａは実測したアンテナの形状と、座標軸配
置を示す。第４図ａでは、第２図に示した場合と
ほぼ同様のアンテナ配置となつているが、接地部
を方形導体板の隅にずらせて配置してある。実験
によれば、方形の一辺の中央部を接地した場合に
比較して、隅を接地した方がより広帯域特性が得
られる。なお筐体寸法は、5.1×4.6×16.5cm、ア
ンテナ高は1.2cmである。第４図ｂおよびｃは、
筐体を自由空間に置いたときのアンテナパタンを
示し、ｂはＸ―Ｙ面パタン、ｃはＹ―Ｚ面パタン
である。なお、以下のアンテナパタン図では実線
で｜E〓｜成分、点線で｜E〓｜成分を表わしてお
り、最外周がダイポールアンテナの利得に相当す
る。 Figure 4 shows data obtained by actually measuring the characteristics of an inverted F-shaped antenna with a conventional arrangement at 920MHz.
FIG. 4a shows the shape of the actually measured antenna and the coordinate axis arrangement. In FIG. 4a, the antenna arrangement is almost the same as that shown in FIG. 2, but the grounding part is shifted to the corner of the rectangular conductor plate. According to experiments, a wider band characteristic can be obtained by grounding the corners of the rectangle than by grounding the center of one side of the square. The housing dimensions are 5.1 x 4.6 x 16.5 cm, and the antenna height is 1.2 cm. Figures 4b and c are
It shows the antenna pattern when the housing is placed in free space, b is the XY plane pattern, and c is the YZ plane pattern. In the antenna pattern diagram below, the solid line represents the |E〓| component, and the dotted line represents the |E〓| component, and the outermost periphery corresponds to the gain of the dipole antenna.
第４図ｂでは、垂直偏波成分が平均してダイポ
ールアンテナ比−7dBの利得を有していたことが
わかる。第４図ｃでは、垂直偏波成分の主輻射方
向が送話器側、すなわち人体が近接する方向にな
つており、人体の影響を受けやすくなつているこ
とがわかる。 In FIG. 4b, it can be seen that the vertically polarized wave component had an average gain of -7 dB compared to the dipole antenna. In FIG. 4c, it can be seen that the main radiation direction of the vertically polarized component is toward the transmitter, that is, in the direction toward which the human body approaches, making it more susceptible to the influence of the human body.
第４図ｄは、筐体を垂直に保持して受話器を右
耳に当てたときのＸ―Ｙ面パタンを示している。
第４図ｂと比較すると、人体装着により人体の影
響が水平・垂直偏波成分ともに大きく、実効利得
の低下が予測される。 FIG. 4d shows the XY plane pattern when the casing is held vertically and the receiver is placed against the right ear.
When compared with FIG. 4b, the effect of the human body on both horizontal and vertical polarization components is large due to wearing on the human body, and it is predicted that the effective gain will decrease.
野外実験によれば、第４図ａの構成の逆Ｆ形ア
ンテナの実効利得は、ダイポールアンテナ比−10
〜−12dB程度であり、人体の影響による利得低
下が極めて大きいアンテナ構成となつていた。 According to field experiments, the effective gain of the inverted F-shaped antenna with the configuration shown in Figure 4a is -10 compared to the dipole antenna.
The antenna configuration had an extremely large gain drop due to the influence of the human body.
（発明の課題）
本発明は上述の欠点を除去し、かつ新たな水
平・垂直両偏波成分を良好に送受信できる新規な
構成の携帯無線機を提供しようとするもので、そ
の特徴は、少なくとも対向する第１及び第２の面
を有し無線機部と受話器と送話器を収納する筐体
と、筐体に固定される逆Ｆ形アンテナとを有する
携帯無線機において、受話器が筐体の前記第１の
面に固定され、逆Ｆ形アンテナが筐体の前記第２
の面で受話器と対向する位置に固定され、逆Ｆ形
アンテナの接地部が第２の面のほぼ上端部に配置
されるごとき携帯無線機にある。(Problems to be solved by the invention) The present invention aims to eliminate the above-mentioned drawbacks and to provide a portable wireless device with a new configuration that can satisfactorily transmit and receive both horizontal and vertical polarization components. In a portable radio device having a casing having first and second opposing surfaces and accommodating a radio unit, a receiver, and a transmitter, and an inverted F-shaped antenna fixed to the casing, the receiver is attached to the casing. an inverted F-shaped antenna is fixed to the first surface of the housing, and an inverted F-shaped antenna is fixed to the second surface of the housing.
The second surface of the portable wireless device is fixed at a position facing the receiver, and the grounding portion of the inverted F-shaped antenna is disposed substantially at the upper end of the second surface.
（発明の構成および作用）
第５図は本発明の一実施例を示す。第５図にお
いて、１５は筐体、１６は受話器、１７は送話
器、１８は板状導体、１９は接地部、２０は給電
部、２１は筐体背面に設けた段差部を示してい
る。この場合も、方形アンテナ導体板の隅の位置
を接地している。(Structure and operation of the invention) FIG. 5 shows an embodiment of the invention. In Fig. 5, 15 is a housing, 16 is a receiver, 17 is a transmitter, 18 is a plate conductor, 19 is a grounding part, 20 is a power supply part, and 21 is a stepped part provided on the back of the housing. . In this case as well, the corners of the rectangular antenna conductor plate are grounded.
第６図は、本発明の配置による逆Ｆ形アンテナ
の特性を920MHzで測定したデータを示し、ａは
座標系、ｂはＸ―Ｙ面パタン、ｃはＹ―Ｚ面パタ
ン、ｄは人体装着時のＸ―Ｙ面パタンを示す。こ
の場合の筐体寸法は5.1×4.6×17.5cmで、後背面
の凹部の寸法は5.5×4.6cmで段差は１cm、アンテ
ナ素子の導体板は約２mm後背面から突出してい
る。 Figure 6 shows the data measured at 920MHz on the characteristics of the inverted F-shaped antenna arranged according to the present invention, where a is the coordinate system, b is the X-Y plane pattern, c is the Y-Z plane pattern, and d is the body-worn pattern. It shows the XY plane pattern at the time. In this case, the dimensions of the housing are 5.1 x 4.6 x 17.5 cm, the dimensions of the recess on the rear back are 5.5 x 4.6 cm, the step is 1 cm, and the conductor plate of the antenna element protrudes from the rear back by about 2 mm.
このような構成になつているから、第６図ｂで
は第４図ｂと比較すると明らかなように、水平偏
波成分の利得が高くなり、かつ垂直偏波成分の利
得も平均してダイポールアンテナ比−6dB程度に
改善されていることがわかる。同様に第６図ｃで
は、第４図ｃと比較すると明らかなように、垂直
偏波成分の主輻射方向は、筐体背面下方であり、
人体とは反対側になるので、人体の影響を受けに
くい構成となつている。 Because of this configuration, the gain of the horizontally polarized wave component is higher in Figure 6b, as is clear when compared with Figure 4b, and the gain of the vertically polarized wave component is also on average equal to that of the dipole antenna. It can be seen that the improvement is approximately -6 dB compared to the current ratio. Similarly, in FIG. 6c, as is clear from a comparison with FIG. 4c, the main radiation direction of the vertically polarized component is below the back of the housing
Since it is on the opposite side from the human body, it has a configuration that is less affected by the human body.
第６図ｂと第６図ｄとを比較すると、人体装着
の影響は第４図ｄの場合と比べて少なく、かつ水
平偏波成分の利得が増していることがわかる。第
４図ｄと第６図ｄとを比較すると、アンテナ素子
を人体から遠ざけて配置した結果、人体の影にな
る部分での利得低下範囲が、第６図ｄでは狭くな
つていることがわかる。この効果は、水平偏波成
分について顕著である。 Comparing FIG. 6b and FIG. 6d, it can be seen that the influence of wearing on the human body is smaller than in the case of FIG. 4d, and the gain of the horizontally polarized component is increased. Comparing Figure 4 d and Figure 6 d, it can be seen that as a result of placing the antenna element farther away from the human body, the range of gain reduction in the shadow of the human body is narrower in Figure 6 d. . This effect is significant for horizontally polarized components.
野外実験によれば、背面配置逆Ｆ形アンテナの
実効利得は、ダイポールアンテナ比−６〜−8dB
程度であり、第４図に示した上面配置逆Ｆ形アン
テナに比べて約4dBの改善が認められた。 According to field experiments, the effective gain of a rear-mounted inverted-F antenna is -6 to -8 dB compared to a dipole antenna.
This was an improvement of about 4 dB compared to the top-mounted inverted F-shaped antenna shown in Figure 4.
第７図は、本発明の他の実施例を示す図で、第
７図ａにおいて２２は筐体、２３は導体板、２４
は接地部、２５は給電部、２６はアンテナ素子先
端の折曲げ部である。この折曲げ部は、アンテナ
導体板が小さくて所要の共振周波数に比べて高い
周波数で共振している場合に、アンテナの共振周
波数を低くする目的で設ける。野外実験によれ
ば、第７図ａの構成では、第６図の場合と比較し
て実効利得の若干の低下があつた。第７図ｂは、
アンテナ素子先端の折曲げ部２６を背面横向きと
した場合を示している。この場合は、ほぼ第６図
に示した逆Ｆ形アンテナに近い良好な特性が得ら
れた。また第７図ｃは筐体背面に逆Ｆ形アンテナ
部が突出した配置例で、この場合比較的良好な結
果が得られた。 FIG. 7 is a diagram showing another embodiment of the present invention. In FIG. 7a, 22 is a housing, 23 is a conductive plate, and 24
25 is a grounding portion, 25 is a power feeding portion, and 26 is a bent portion at the tip of the antenna element. This bent portion is provided for the purpose of lowering the resonant frequency of the antenna when the antenna conductor plate is small and resonates at a higher frequency than a required resonant frequency. According to field experiments, the configuration shown in FIG. 7a had a slight decrease in effective gain compared to the configuration shown in FIG. Figure 7b is
A case is shown in which the bent portion 26 at the tip of the antenna element is oriented horizontally on the back. In this case, good characteristics almost similar to those of the inverted F-type antenna shown in FIG. 6 were obtained. Further, FIG. 7c shows an example of an arrangement in which an inverted F-shaped antenna portion protrudes from the rear surface of the housing, and relatively good results were obtained in this case.
以上の説明では、逆Ｆ形アンテナを携帯無線機
の送受話器取付面と反対側の面に取付け、接地部
を上方に配置した例を示したが、接地部の位置
を、アンテナ素子上端部で図示した位置からずら
せて配置することも可能である。また、アンテナ
上面を筐体表面から例示した高さと異なつた高さ
で突出した場合も可能である。 In the above explanation, an example was shown in which the inverted F-shaped antenna was attached to the surface opposite to the handset mounting surface of the portable radio, and the grounding part was placed upward. It is also possible to arrange it offset from the position shown. It is also possible that the top surface of the antenna protrudes from the surface of the casing at a height different from the height illustrated.
（発明の効果）
以上説明したように、本発明では、送受話器取
付面と反対側の面に逆Ｆ形アンテナを取付けてい
るので、携帯無線機使用時に顔とアンテナとの間
に筐体が介在し、人体の影響が少なくなる。ま
た、携帯機背面に段差を設けて逆Ｆ形アンテナが
背面から突出しないようにした場合も利得が低下
しないので、突起部のない携帯無線機が実現で
き、操作時のアンテナ破損事故をなくすことがで
きる。更に、接地部を地面から最も遠い位置とな
る端部に配置した場合は、人体装着時にスリーブ
アンテナを使用した場合と同等の実効利得（ダイ
ポールアンテナ比−6dB）が得られるという利点
があり、波長に比べて充分低い（1/30波長程度）
形状で小形・高性能なアンテナ特性を実現でき
る。また、逆Ｆ形アンテナは広帯域特性を有する
（例示したアンテナでは、いずれも870MHzから
940MHzの間で定在波比1.5〜2.0以下であつた）
ので、特に広帯域で使用する多チヤンネル切換方
式携帯無線機への応用に適しており、実用上の価
値は極めて大きい。(Effects of the Invention) As explained above, in the present invention, since the inverted F-shaped antenna is attached to the surface opposite to the handset mounting surface, there is no space between the casing and the antenna when using the portable radio. intervention, reducing the impact on the human body. In addition, even if a step is provided on the back of the mobile device to prevent the inverted F-shaped antenna from protruding from the back, the gain will not decrease, making it possible to create a mobile radio without any protrusions, which eliminates antenna breakage accidents during operation. Can be done. Furthermore, if the grounding part is placed at the end farthest from the ground, it has the advantage of providing the same effective gain (-6 dB compared to dipole antennas) as when using a sleeve antenna when worn on the human body. (about 1/30 wavelength)
It is possible to achieve small size and high performance antenna characteristics due to its shape. In addition, inverted F-shaped antennas have wideband characteristics (in the example antennas, all from 870MHz
The standing wave ratio was below 1.5 to 2.0 between 940MHz)
Therefore, it is particularly suitable for application to multi-channel switching type portable radio equipment used in a wide band, and has extremely great practical value.
第１図は従来のホイツプアンテナを用いた携帯
無線機の概略図、第２図は逆Ｆ形アンテナを用い
た従来の携帯無線機の概略図、第３図は逆Ｆ形ア
ンテナの側面図、第４図ａ〜ｄは従来の構成にお
ける逆Ｆ形アンテナの特性例、第５図は本発明の
構成例、第６図ａ〜ｄは本発明の構成における逆
Ｆ形アンテナの特性例、第７図ａ〜ｃは本発明の
構成による他の実施例の概略図である。
１…ホイツプアンテナ、２，５，１５，２２…
筐体、３，６，１６…受話器、４，７，１７…送
話器、８，１８，２３…板状導体、９，１３，１
９，２４…接地部導体、１０，１２，２０，２５
…給電部、１１…アンテナ素子、１４…地板、２
１…筐体背面に設けた段差部、２６…アンテナ素
子先端の折曲げ部。
Fig. 1 is a schematic diagram of a conventional portable radio device using a whip antenna, Fig. 2 is a schematic diagram of a conventional portable radio device using an inverted F-shaped antenna, and Fig. 3 is a side view of the inverted F-shaped antenna. 4a to d show characteristic examples of an inverted F-type antenna in a conventional configuration, FIG. 5 shows an example of the configuration of the present invention, FIGS. Figures a to c are schematic diagrams of other embodiments according to the configuration of the present invention. 1... Whip antenna, 2, 5, 15, 22...
Housing, 3, 6, 16... Receiver, 4, 7, 17... Transmitter, 8, 18, 23... Plate conductor, 9, 13, 1
9, 24...Grounding conductor, 10, 12, 20, 25
...Power feeding unit, 11...Antenna element, 14...Ground plate, 2
1... Stepped portion provided on the back surface of the housing, 26... Bent portion at the tip of the antenna element.
Claims (1)
無線機部と受話器と送話器を収納する筐体と、筐
体に固定される逆Ｆ形アンテナとを有する携帯無
線機において、受話器が筐体の前記第１の面に固
定され、逆Ｆ形アンテナが筐体の前記第２の面で
受話器と対向する位置に固定され、逆Ｆ形アンテ
ナの接地部が第２の面のほぼ上端部に配置される
ことを特徴とする携帯無線機。 ２ 前記第２の面は段差を有し、逆Ｆ形アンテナ
が段差の底部に固定されるごとき特許請求の範囲
第１項記載の携帯無線機。[Claims] 1. A mobile phone comprising: a casing having at least first and second opposing surfaces and accommodating a radio unit, a receiver, and a transmitter; and an inverted F-shaped antenna fixed to the casing. In the radio device, a receiver is fixed to the first surface of the housing, an inverted F-shaped antenna is fixed to the second surface of the housing at a position facing the receiver, and a ground portion of the inverted F-shaped antenna is fixed to the second surface of the housing. 2. A portable radio device characterized in that the device is disposed substantially at the upper end of the second surface. 2. The portable wireless device according to claim 1, wherein the second surface has a step, and the inverted F-shaped antenna is fixed to the bottom of the step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18670282A JPS5977724A (en) | 1982-10-26 | 1982-10-26 | Portable radio device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18670282A JPS5977724A (en) | 1982-10-26 | 1982-10-26 | Portable radio device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5977724A JPS5977724A (en) | 1984-05-04 |
| JPS638655B2 true JPS638655B2 (en) | 1988-02-24 |
Family
ID=16193133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18670282A Granted JPS5977724A (en) | 1982-10-26 | 1982-10-26 | Portable radio device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5977724A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9046860B2 (en) | 1995-03-27 | 2015-06-02 | Canon Kabushiki Kaisha | Coupling part, photosensitive drum, process cartridge and electrophotographic image forming apparatus |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60242705A (en) * | 1984-05-16 | 1985-12-02 | Mitsubishi Electric Corp | Antenna for radio equipment |
| JPS6187434A (en) * | 1984-10-04 | 1986-05-02 | Nec Corp | Portable radio equipment |
| JPS6210902A (en) * | 1985-03-01 | 1987-01-19 | Nippon Telegr & Teleph Corp <Ntt> | Portable radio equipment |
| JP2702109B2 (en) * | 1985-08-29 | 1998-01-21 | 日本電気株式会社 | Portable radio |
| US4679233A (en) * | 1985-08-30 | 1987-07-07 | Motorola, Inc. | Microphone |
| US4876552A (en) * | 1988-04-27 | 1989-10-24 | Motorola, Inc. | Internally mounted broadband antenna |
| JP3798733B2 (en) * | 2001-06-13 | 2006-07-19 | 株式会社東芝 | Wireless module and wireless communication terminal provided with the wireless module |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3701016A (en) * | 1969-04-14 | 1972-10-24 | Motorola Inc | Miniature transmitter receiver housing |
| JPS499425A (en) * | 1972-05-26 | 1974-01-28 | ||
| JPS5030918U (en) * | 1973-07-16 | 1975-04-05 | ||
| JPS56116303A (en) * | 1980-02-19 | 1981-09-12 | Meisei Electric Co Ltd | Transmission line type antenna |
-
1982
- 1982-10-26 JP JP18670282A patent/JPS5977724A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3701016A (en) * | 1969-04-14 | 1972-10-24 | Motorola Inc | Miniature transmitter receiver housing |
| JPS499425A (en) * | 1972-05-26 | 1974-01-28 | ||
| JPS5030918U (en) * | 1973-07-16 | 1975-04-05 | ||
| JPS56116303A (en) * | 1980-02-19 | 1981-09-12 | Meisei Electric Co Ltd | Transmission line type antenna |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9046860B2 (en) | 1995-03-27 | 2015-06-02 | Canon Kabushiki Kaisha | Coupling part, photosensitive drum, process cartridge and electrophotographic image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5977724A (en) | 1984-05-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1271690B1 (en) | An antenna | |
| US7233294B2 (en) | Computer with an embedded antenna | |
| US6707431B2 (en) | Dual antenna capable of controlling radiation characteristics in a mobile communication terminal | |
| US7225003B2 (en) | Mobile terminal including first and second housings and an antenna | |
| US6424300B1 (en) | Notch antennas and wireless communicators incorporating same | |
| JP3713476B2 (en) | Mobile communication terminal | |
| JP2003505963A (en) | Capacitively tuned broadband antenna structure | |
| KR20000076272A (en) | Antenna assembly for telecommunication devices | |
| US6683578B2 (en) | Built-in antenna of portable radio apparatus | |
| JP3432768B2 (en) | Antennas for portable communication terminals | |
| JPS638655B2 (en) | ||
| US6677907B2 (en) | Antenna device and portable terminal | |
| JP2001244715A (en) | Antenna system | |
| JPS6356731B2 (en) | ||
| JPS6234405A (en) | Antenna for radio equipment | |
| GB2347560A (en) | Radio apparatus | |
| JP3165005B2 (en) | Portable radio | |
| JPH08265026A (en) | Portable radio equipment | |
| JP2602071B2 (en) | Portable radio | |
| JPH05259725A (en) | Diversity antenna for portable radio equipment | |
| JPH0225283B2 (en) | ||
| JP3746613B2 (en) | Antenna feeder and portable radio | |
| JP3113460B2 (en) | Mobile communication device | |
| US7146201B2 (en) | Portable wireless apparatus | |
| JP2708449B2 (en) | Broadband antenna |