JPH0691483B2 - Inductive wireless communication device - Google Patents
Inductive wireless communication deviceInfo
- Publication number
- JPH0691483B2 JPH0691483B2 JP60106323A JP10632385A JPH0691483B2 JP H0691483 B2 JPH0691483 B2 JP H0691483B2 JP 60106323 A JP60106323 A JP 60106323A JP 10632385 A JP10632385 A JP 10632385A JP H0691483 B2 JPH0691483 B2 JP H0691483B2
- Authority
- JP
- Japan
- Prior art keywords
- loop antenna
- fixed station
- horizontal
- dead zone
- road
- 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
- 230000001939 inductive effect Effects 0.000 title description 6
- 230000008878 coupling Effects 0.000 claims description 9
- 238000010168 coupling process Methods 0.000 claims description 9
- 238000005859 coupling reaction Methods 0.000 claims description 9
- 230000006698 induction Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
- H04B5/24—Inductive coupling
- H04B5/26—Inductive coupling using coils
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Near-Field Transmission Systems (AREA)
- Mobile Radio Communication Systems (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は路上の移動体に設置した移動局用のル−プア
ンテナと、路側上に設置した固定局用のル−プアンテナ
とを電磁結合させて移動局および固定局間で通信を行う
誘導無線装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention electromagnetically couples a loop antenna for a mobile station installed on a moving body on a road and a loop antenna for a fixed station installed on the roadside. The present invention relates to an inductive wireless device that performs communication between a mobile station and a fixed station.
第５図および第６図はこの種の従来の誘導無線装置の構
成を示す概念図であり、固定局用のル−プアンテナ
（１）は路側上の高い位置に固定され、移動局用のル−
プアンテナ（２）は道路（３）上を移動する移動体
（４）の最高部に設けられている。FIG. 5 and FIG. 6 are conceptual diagrams showing the configuration of a conventional guided wireless device of this type, in which a loop antenna (1) for a fixed station is fixed at a high position on the roadside and a loop for a mobile station. −
The antenna (2) is provided at the highest part of the moving body (4) moving on the road (3).
ここで、固定局用のル−プアンテナ（１）および移動局
用のル−プアンテナ（２）は、第５図の矢印Ａに示すよ
うに、両方ともその軸を道路面に対して垂直にするか、
あるいは、第６図の矢印Ｂに示すように、両方ともその
軸を道路面に対して水平で、しかも相互に平行にするか
いずれかの取付状態が採用されていた。Here, the loop antenna (1) for the fixed station and the loop antenna (2) for the mobile station both have their axes perpendicular to the road surface, as shown by the arrow A in FIG. Or
Alternatively, as shown by an arrow B in FIG. 6, both of them are mounted so that their axes are horizontal to the road surface and parallel to each other.
このように送信側および受信側に双方がル−プアンテナ
を備える誘導無線装置にあつては、受信領域内において
磁気結合レベルが急速に低下するデツドゾ−ンのあるこ
とが、例えば、特公昭59-27492号公報にも詳しく説明さ
れている。第７図乃至第11図はこのデツドゾ−ンを説明
するために、それぞれ、路側上のル−プアンテナ（１）
を送信側、移動体のル−プアンテナ（２）を受信側とし
たとき、ル−プアンテナ（１）の設置点を基準にした特
性図である。As described above, in an inductive wireless device having a loop antenna on both the transmitting side and the receiving side, there is a dead zone in which the magnetic coupling level is rapidly lowered in the receiving area. It is also described in detail in Japanese Patent No. 27492. In order to explain this dead zone, FIGS. 7 to 11 show the loop antenna (1) on the roadside, respectively.
FIG. 3 is a characteristic diagram with the installation point of the loop antenna (1) as a reference, where is the transmission side and the loop antenna (2) of the mobile body is the reception side.
このうち、第７図はル−プアンテナ（１），（２）の両
方が路面に対して軸が垂直になるように取付けられた、
いわゆる、垂直・垂直結合時における垂直磁界の受信レ
ベルで、ル−プアンテナの高さの差が１〔ｍ〕で水平方
向距離が０〔ｍ〕の点の受信レベル（最大値）を０〔d
B〕としている。また、第８図はル−プアンテナ
（１），（２）が垂直・垂直結合され、アンテナの高さ
の差が３〔ｍ〕であるときに垂直磁界の受信レベルが等
しい点を結んだもので、水平方向距離が０〔ｍ〕の地点
の受信レベル（最大値）を０〔dB〕としている。Of these, in FIG. 7, both the loop antennas (1) and (2) are mounted so that their axes are perpendicular to the road surface.
In the so-called vertical magnetic field reception level at the time of vertical / vertical coupling, the reception level (maximum value) at the point where the height difference of the loop antenna is 1 [m] and the horizontal distance is 0 [m] is 0 [d].
B]. Further, FIG. 8 shows that the loop antennas (1) and (2) are vertically / vertically coupled, and the points where the reception levels of the vertical magnetic fields are equal when the height difference between the antennas is 3 [m] are connected. Then, the reception level (maximum value) at the point where the horizontal distance is 0 [m] is 0 [dB].
これら第７図および第８図から判るように、アンテナの
高さの差が１〔ｍ〕のとき、ル−プアンテナ（１）の中
心から略1.5〔ｍ〕の位置に円形のデツドゾ−ンが存在
し、さらに、アンテナの高さの差が３〔ｍ〕のとき、ル
−プアンテナ（１）の中心から約4.3〔ｍ〕の位置に円
形のデツドゾ−ンが存在している。As can be seen from FIGS. 7 and 8, when the height difference between the antennas is 1 [m], a circular dead zone is formed at a position approximately 1.5 [m] from the center of the loop antenna (1). When the height difference between the antennas is 3 [m], a circular dead zone is present at a position approximately 4.3 [m] from the center of the loop antenna (1).
次に、第９図はル−プアンテナ（１），（２）の両方が
路面に対して軸が水平になるように取付けられた、いわ
ゆる、水平・水平結合したときの水平磁界の受信レベル
で、ル−プアンテナの高さの差が１〔ｍ〕で水平方向距
離が０〔ｍ〕の地点の受信レベル（最大値）を０〔dB〕
としている。また、第10図はル−プアンテナ（１），
（２）を水平・水平結合とし、送信アンテナ（１）の軸
とは垂直な方向の水平磁界の受信レベルを示し、さら
に、第11図はル−プアンテナ（１），（２）を水平・水
平結合したとき、水平磁界の受信レベルが等しい点を結
んだもので、曲線の密に集まる部分がデツドゾ−ンを示
している。Next, FIG. 9 shows reception levels of so-called horizontal magnetic fields when both the loop antennas (1) and (2) are mounted so that their axes are horizontal to the road surface, that is, when so-called horizontal / horizontal coupling is performed. , The reception level (maximum value) at the point where the height difference of the loop antenna is 1 [m] and the horizontal distance is 0 [m] is 0 [dB].
I am trying. Further, FIG. 10 shows a loop antenna (1),
(2) is horizontal / horizontal coupling, and shows the reception level of the horizontal magnetic field in the direction perpendicular to the axis of the transmitting antenna (1). Furthermore, FIG. 11 shows that the loop antennas (1) and (2) are When horizontally coupled, the points at which the reception levels of the horizontal magnetic field are equal are connected, and the densely gathered portion of the curve shows the dead zone.
これら第９図乃至第11図から明らかなように、アンテナ
の高さの差が大きくなるほど中心位置からずれた位置に
放物線形状のデツドゾ−ンが存在することになる。As is clear from FIGS. 9 to 11, as the height difference between the antennas increases, a parabolic shaped dead zone exists at a position displaced from the center position.
上記のような従来の誘導無線通信装置にあつては、路側
上に設置した固定局用のル−プアンテナを中心にして、
垂直・垂直結合では円形の、水平・水平結合では放物線
のデツドゾ−ンがそれぞれ数メ−トルの位置に形成され
るため、移動体が走行するときこのデツドゾ−ンを避け
て通ることが難しくその度毎に通信障害が発生するとい
う問題点があつた。In the conventional induction wireless communication device as described above, centering on the loop antenna for the fixed station installed on the roadside,
The vertical / vertical connection forms a circular shape, and the horizontal / horizontal connection forms a parabolic dead zone at several meters, which makes it difficult for the moving body to avoid this dead zone when traveling. There was a problem that communication failure occurred every time.
この発明はかかる問題点を解決するためになされたもの
で、固定局用のル−プアンテナ付近でも良質な通信を確
保し得る誘導無線通信装置の提供を目的とする。The present invention has been made to solve the above problems, and an object of the present invention is to provide a guided wireless communication device capable of ensuring good communication even in the vicinity of a loop antenna for a fixed station.
この発明に係る誘導無線通信装置は、移動局用のループ
アンテナおよび固定局用のループアンテナのいずれかか
一方を、その軸が路面に対して水平で且つ走行方向に対
して垂直になるように設置し、いずれか他方を、その軸
が路面に対して垂直になるように設置すると共に、固定
局用のループアンテナを路側上に設置して路側に沿って
デッドゾーンを形成したものである。The inductive wireless communication device according to the present invention uses one of a loop antenna for a mobile station and a loop antenna for a fixed station so that its axis is horizontal to the road surface and vertical to the traveling direction. One of them is installed so that its axis is perpendicular to the road surface, and a loop antenna for a fixed station is installed on the road side to form a dead zone along the road side.
この発明においては、固定局用のループアンテナおよび
移動局用のループアンテナそれぞれの軸の向きを互いに
違えるとともに、固定局用のループアンテナを路側と道
路との中間に設置することによって、移動体が通過する
ことのない路側上、または、路側と走行路との中間部に
デツドゾ−ンを形成する。In the present invention, while the directions of the axes of the loop antenna for the fixed station and the loop antenna for the mobile station are different from each other, and the loop antenna for the fixed station is installed in the middle of the roadside and the road, A dead zone is formed on the road side that does not pass through or in the middle of the road side and the traveling road.
第１図はこの発明の一実施例の構成を示す概念図であ
り、第５図と同一の符号を付したものはそれぞれ同一ま
たは相当の部分を示している。そして、第５図では固定
局用のル−プアンテナ（１）および移動局用のル−プア
ンテナ（２）の両方ともその軸が道路面に対して垂直に
なるように設置されていたが、この第１図では固定局用
のル−プアンテナ（１）が道路面に対して垂直で、且
つ、走行方向に対して垂直になるように設置され、移動
局用のル−プアンテナ（２）はその軸が道路面に対して
垂直になるように設置されている。すなわち、第５図の
従来の装置はル−プアンテナ相互間で垂直・垂直結合を
採つていたが、この第１図では水平・垂直結合が採用さ
れている。FIG. 1 is a conceptual diagram showing the configuration of an embodiment of the present invention, and the components denoted by the same reference numerals as those in FIG. 5 respectively indicate the same or corresponding portions. Then, in FIG. 5, both the fixed station loop antenna (1) and the mobile station loop antenna (2) were installed so that their axes were perpendicular to the road surface. In FIG. 1, the loop antenna (1) for a fixed station is installed so as to be perpendicular to the road surface and perpendicular to the traveling direction, and the loop antenna (2) for a mobile station is The axis is installed so that it is perpendicular to the road surface. That is, the conventional device shown in FIG. 5 employs vertical / vertical coupling between the loop antennas, but in FIG. 1, horizontal / vertical coupling is employed.
ここで、固定局用のル−プアンテナ（１）を送信側、移
動局用のル−プアンテナ（２）を受信側とすると、送信
側のル−プアンテナ（１）の軸方向距離に対する垂直磁
界の受信レベルは第２図に示すように軸方向距離が大き
くなるに従つて緩やかに減衰し、アンテナの中心すなわ
ち設置点がデツドゾ−ンになつている。Here, when the loop antenna (1) for the fixed station is the transmitting side and the loop antenna (2) for the mobile station is the receiving side, the vertical magnetic field with respect to the axial distance of the loop antenna (1) on the transmitting side is As shown in FIG. 2, the reception level is gradually attenuated as the axial distance increases, and the center of the antenna, that is, the installation point is in the dead zone.
第３図はこの送信側のル−プアンテナ（１）の垂直磁界
の受信レベルが等しくなる点を連ねた平面特性であり、
各曲線が最も密になるデツドゾ−ンは軸と直角方向に存
在している。このことは、固定局用のル−プアンテナ
（１）を路側上に設置すれば路側に沿つてデツドゾ−ン
が形成され、固定局用のル−プアンテナ（１）を路側と
道路との中間に設置すれば路側と道路との中間にデツド
ゾ−ンが形成されることに他ならず、どちらの場合も道
路上にデツドゾ−ンが形成されることはなくなる。FIG. 3 is a plane characteristic in which points at which the reception level of the vertical magnetic field of the loop antenna (1) on the transmitting side becomes equal to each other are connected,
The dead zone in which each curve is densest exists in the direction perpendicular to the axis. This means that if the fixed station loop antenna (1) is installed on the roadside, a dead zone is formed along the roadside, and the fixed station loop antenna (1) is placed between the roadside and the road. If installed, a dead zone is formed between the road side and the road, and in both cases, the dead zone is not formed on the road.
かくして、固定局と移動局との間でデツドゾ−ンに影響
されない良質な通信を確保することができる。Thus, it is possible to secure good quality communication between the fixed station and the mobile station, which is not affected by the dead zone.
第４図はこの発明の他の実施例の構成を示す概念図であ
り、第１図と同一の符号を付したものはそれぞれ同一ま
たは相当部分を示している。そして、固定局用のル−プ
アンテナ（１）を道路面に対して垂直に設置した点、お
よび、移動局用のル−プアンテナ（２）を、その軸が道
路面に対して水平で且つ移動体の走行方向に対して垂直
に設置した点が第１図と異つている。すなわち、第１図
に示したものル−プアンテナ相互間で水平・垂直結合を
採用したが、この実施例では垂直・水平結合を採用して
いる。FIG. 4 is a conceptual diagram showing the configuration of another embodiment of the present invention, in which the same reference numerals as in FIG. 1 denote the same or corresponding parts. The fixed station loop antenna (1) is installed vertically to the road surface, and the mobile station loop antenna (2) has its axis horizontal and movable with respect to the road surface. It differs from FIG. 1 in that it is installed perpendicularly to the running direction of the body. That is, although horizontal / vertical coupling is adopted between the loop antennas shown in FIG. 1, vertical / horizontal coupling is adopted in this embodiment.
かかる構成であつても、デツドゾ−ンに影響されない通
信が可能になることは明白である。Even with such a configuration, it is obvious that communication can be performed without being affected by the dead zone.
また、上記実施例では路側に設けられるル−プアンテナ
（１）が送信側である場合について説明したが移動局用
のル−プアンテナ（２）を送信側としても、水平磁界と
垂直磁界との関係が変わるだけで全く同様な結合関係が
得られ、やはり上述したと同様な良質な通信が行なわれ
る。In the above embodiment, the case where the loop antenna (1) provided on the roadside is the transmission side has been described, but the relationship between the horizontal magnetic field and the vertical magnetic field can be obtained even when the loop antenna (2) for the mobile station is used as the transmission side. However, the same connection relation can be obtained only by changing, and the same high-quality communication as described above can be performed.
この発明は以上説明した通り、移動局用のループアンテ
ナおよび固定局用のループアンテナのいずれか一方を、
その軸が路面に対して水平で且つ走行方向に対して垂直
になるように設置し、いずれか他方を、その軸が路面に
対して垂直になるように設置すると共に、固定局用のル
ープアンテナを路側上に設置し、路側に沿ってデッドゾ
ーンを形成させるようにしたので固定局と移動局との間
でデッドゾーンに影響されない良質な通信を確保するこ
とができる。As described above, the present invention uses one of a loop antenna for a mobile station and a loop antenna for a fixed station,
A loop antenna for a fixed station is installed so that its axis is horizontal to the road surface and perpendicular to the traveling direction, and one of the other is installed so that its axis is perpendicular to the road surface. Is installed on the roadside, and a dead zone is formed along the roadside, so that it is possible to secure high-quality communication between the fixed station and the mobile station that is not affected by the dead zone.
第１図はこの発明の一実施例の構成を示す概念図、第２
図および第３図は同実施例の動作を説明するための特性
図、第４図はこの発明の他の実施例の構成を示す概念
図、第５図および第６図は従来の誘導無線通信装置の構
成を示す概念図、第７図乃至第11図はこの誘導無線通信
装置の動作を説明するための特性図である。 （１）：固定局用のル−プアンテナ （２）：移動局用のル−プアンテナ （３）：道路、（４）：移動体 （５）：路側 なお、各図中同一符号は同一または相当部分を示す。FIG. 1 is a conceptual diagram showing the configuration of an embodiment of the present invention, and FIG.
FIG. 3 and FIG. 3 are characteristic diagrams for explaining the operation of the same embodiment, FIG. 4 is a conceptual diagram showing the configuration of another embodiment of the present invention, and FIGS. 5 and 6 are conventional inductive wireless communications. 7 and 11 are characteristic diagrams for explaining the operation of the inductive wireless communication device. (1): Loop antenna for fixed station (2): Loop antenna for mobile station (3): Road, (4): Moving body (5): Road side The same reference numerals in the drawings are the same or equivalent. Shows the part.
Claims (1)
アンテナと、路側上に設置した固定局用のループアンテ
ナとを電磁結合させて移動局および固定局間で通信を行
う誘導無線装置において、前記移動局用のループアンテ
ナおよび固定局用のループアンテナのいずれか一方を、
その軸が路面に対して水平で且つ走行方向に対して垂直
になるように設置し、いずれか他方を、その軸が路面に
対して垂直になるように設置すると共に、固定局用のル
ープアンテナを路側上に設置し、路側に沿ってデッドゾ
ーンを形成させるようにしたことを特徴とする誘導無線
通信装置。1. An induction radio apparatus for electromagnetically coupling a loop antenna for a mobile station installed on a moving body on the road and a loop antenna for a fixed station installed on the roadside to perform communication between the mobile station and the fixed station. In, either one of the loop antenna for the mobile station and the loop antenna for the fixed station,
A loop antenna for a fixed station is installed so that its axis is horizontal to the road surface and perpendicular to the traveling direction, and one of the other is installed so that its axis is perpendicular to the road surface. Is installed on the roadside to form a dead zone along the roadside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60106323A JPH0691483B2 (en) | 1985-05-16 | 1985-05-16 | Inductive wireless communication device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60106323A JPH0691483B2 (en) | 1985-05-16 | 1985-05-16 | Inductive wireless communication device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61262326A JPS61262326A (en) | 1986-11-20 |
| JPH0691483B2 true JPH0691483B2 (en) | 1994-11-14 |
Family
ID=14430713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60106323A Expired - Fee Related JPH0691483B2 (en) | 1985-05-16 | 1985-05-16 | Inductive wireless communication device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0691483B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09275369A (en) * | 1996-04-08 | 1997-10-21 | Toyota Motor Corp | Communication equipment between road and vehicle |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4987215A (en) * | 1972-12-25 | 1974-08-21 |
-
1985
- 1985-05-16 JP JP60106323A patent/JPH0691483B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61262326A (en) | 1986-11-20 |
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