JPS6296881A - Antenna for embedded article detector - Google Patents

Antenna for embedded article detector

Info

Publication number
JPS6296881A
JPS6296881A JP60236893A JP23689385A JPS6296881A JP S6296881 A JPS6296881 A JP S6296881A JP 60236893 A JP60236893 A JP 60236893A JP 23689385 A JP23689385 A JP 23689385A JP S6296881 A JPS6296881 A JP S6296881A
Authority
JP
Japan
Prior art keywords
antenna
transmitting
receiving
radio waves
antennas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP60236893A
Other languages
Japanese (ja)
Other versions
JPH0690274B2 (en
Inventor
Kazuo Watabe
一雄 渡部
Kimio Morikawa
森川 公夫
Shigemi Yamazawa
山沢 成実
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Meisei Electric Co Ltd
Japan Steel Works Ltd
Technical Research and Development Institute of Japan Defence Agency
Original Assignee
Meisei Electric Co Ltd
Japan Steel Works Ltd
Technical Research and Development Institute of Japan Defence Agency
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Meisei Electric Co Ltd, Japan Steel Works Ltd, Technical Research and Development Institute of Japan Defence Agency filed Critical Meisei Electric Co Ltd
Priority to JP60236893A priority Critical patent/JPH0690274B2/en
Publication of JPS6296881A publication Critical patent/JPS6296881A/en
Publication of JPH0690274B2 publication Critical patent/JPH0690274B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

PURPOSE:To enhance the isolation between transmitting and receiving antennae, by providing a strip line between the transmitting and receiving antennae and setting off a leak-in radio wave by the radio wave through said strip line. CONSTITUTION:Strip lines 41A, 42A are provided so as to leave a narrow gap (d) from a transmitting antenna 2A and receiving antennae 31A, 32A. The length (l) of each of the lines 41A, 42A is set so that the radio wave inputted to the antennae 31A, 32A from the antenna 2A through the lines 41A, 42A has the same phase as the radio wave inputted to the antennae 31A, 32A from the antenna 2A by leak-in. Further, the gap (d) is set so that the above-mentioned both radio waves are kept at almost the same level. By performing setting as mentioned above, the radio wave leaked in the antennae 31A, 32A from the antenna 2A is set off by the radio waves respectively propagated through the lines 41A, 42A and, therefore, the level of the radio wave inputted to a receiver becomes extremely low.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、電波を使用して地中埋設物を探知する埋設物
探知器の送信アンテナと受信アンテナとの間のアインレ
ーシ、ンを改善したアンテナに関する。
[Detailed Description of the Invention] (Industrial Application Field) The present invention improves the alignment between the transmitting antenna and the receiving antenna of a buried object detector that uses radio waves to detect underground objects. Regarding antennas.

(発明の背景) 送信機から電波を放射し、この電波が地中埋設物で反射
して返ってくる反射波を受信機で受信することによって
上記地中埋設物を検知する探知器が公知である。
(Background of the Invention) A detector is known that detects underground objects by emitting radio waves from a transmitter, and receiving reflected waves from the radio waves reflected by the underground objects using a receiver. be.

かかる探知器では、第3図て示すように、送信アンテナ
2と受信アンテナ3が間隙りを隔てて併設され、送信ア
ンテナ2から放射された電波が地中5に埋設された地中
埋設物6で反射して返ってくる反射波を受信アンテナ3
で受信するように構成される。
In such a detector, as shown in FIG. 3, a transmitting antenna 2 and a receiving antenna 3 are installed side by side with a gap between them, and the radio waves radiated from the transmitting antenna 2 are transmitted to an underground object 6 buried underground 5. Receiving antenna 3 receives the reflected wave reflected by
configured to receive it.

上記受信アンテナ3に入射する電波は、本来の目的に適
う地中埋設物6からの反射波(イ)の他に地中5の表面
(地表)からの反射波(Ol及び送信アンテナ2から受
信アンテナ3に直接到達する漏れ込み電波Q→とがあり
、受信アンテナ3にはこれら3種の電波の合成ベクトル
として信号が得られる。
The radio waves incident on the receiving antenna 3 include reflected waves from the underground structure 6 (a) that serve the original purpose, as well as reflected waves from the surface of the underground 5 (earth surface) (received from the OL and the transmitting antenna 2). There is a leakage radio wave Q→ that directly reaches the antenna 3, and a signal is obtained at the receiving antenna 3 as a composite vector of these three types of radio waves.

ところで、上記漏れ込み電波(−)は埋設物探知には全
く不必要なものであるばかりか、その量が過大になると
そのベクトル成分は地中埋設物6からの反射波(イ)及
び地表からの反射波(ロ)のベクトル成分を大幅に上回
り、受信側の受信波検波用ダイオード及び受信回路が飽
和して探知機能を損うか又は探知不能となる。
By the way, the above-mentioned leakage radio waves (-) are not only completely unnecessary for buried object detection, but if their amount becomes excessive, their vector components will be reflected waves (a) from the underground object 6 and from the ground surface. This greatly exceeds the vector component of the reflected wave (b), and the received wave detection diode and receiving circuit on the receiving side become saturated, impairing the detection function or becoming undetectable.

この問題は、同方式のCWレーダ等に於いても生ずるが
、CWレーダ等では検知対象物が一般に送受信アンテナ
から遠く離れているため、送信アンテナ2と受信アンテ
ナ3との間の間隔りを長く設定することによって送信、
受信アンテナ間のアインレーシ、ンを良くする(すなわ
ち漏れ込み電波し→の量を少なくする。)ことで解決で
きる。然しながら、埋設物探知器のように検知対象物と
アンテナとの間が短いものでは、送信アンテナ2と受信
アンテナ3との間の間隔りを長くすると送信電波のビー
ム(勾と受信電波のビーム(ホ)とが交差しなくなって
地中埋設物6での反射波(づ及び地表での反射波C口)
が受信アンテナ3に入射しなくなり埋設物探知が不能と
なる。
This problem also occurs in CW radars of the same type, but in CW radars, the detection target is generally far away from the transmitting and receiving antennas, so the distance between the transmitting antenna 2 and the receiving antenna 3 is increased. Send by setting,
This can be solved by improving the alignment between the receiving antennas (that is, reducing the amount of radio wave leakage). However, in a device such as a buried object detector where the distance between the detection target and the antenna is short, increasing the distance between the transmitting antenna 2 and the receiving antenna 3 will cause the beam of the transmitted radio wave (angle) and the beam of the received radio wave ( (e) no longer intersects, and the reflected wave at the underground object 6 (Du and reflected wave at the ground surface C)
will no longer be incident on the receiving antenna 3, making it impossible to detect buried objects.

(発明の目的) 本発明は、以上の問題点を解決すべく提案するもので、
送信、受信アンテナ間の間隔が短い場合にも良好なアイ
ンレーシ、ンが得られる埋設物探知器用アンテナを得る
ことを目的とする。
(Object of the invention) The present invention is proposed to solve the above problems.
The purpose of the present invention is to obtain an antenna for a buried object detector that can obtain good alignment even when the distance between transmitting and receiving antennas is short.

(発明の概要) 以上の目的のため、本発明は、送信アンテナと受信アン
テナの双方に対して狭い間隙をもってストリップライン
を設け、このストリップラインを介して上記送信アンテ
ナから受信アンテナに入力される電波の位相が前記漏れ
込み電波の位相と逆相となシ、かつ双方の電波のレベル
が略同−となるように桶該ストリップラインの長さ及び
上記間隙の寸法を設定して前記漏れ込み電波のベクトル
成分を上記ス) IJッグラインを介した電波で相殺し
、もって送信、受信アンテナ間のアインレーシ冒ンの改
善を図ったものである。
(Summary of the Invention) For the above purpose, the present invention provides a strip line with a narrow gap between both the transmitting antenna and the receiving antenna, and radio waves are input from the transmitting antenna to the receiving antenna via the strip line. The length of the strip line and the dimensions of the gap are set so that the phase of the leaking radio wave is opposite to that of the leaking radio wave, and the levels of both radio waves are approximately the same. The vector components of (a) are canceled out by the radio waves passing through the IJ grid line, thereby improving the interference between the transmitting and receiving antennas.

(発明の実施例) 第1図は、本発明を実施した地中埋設物探知器のアンテ
ナ部の構造を示す平面図、第2図は第1図に示す実施例
のアイソレーション特性を従来のアンテナ(ストリップ
ラインのないもの)のアイソレーション特性と比較して
示した図である。
(Embodiment of the invention) Fig. 1 is a plan view showing the structure of the antenna section of an underground object detector embodying the present invention, and Fig. 2 shows the isolation characteristics of the embodiment shown in Fig. 1 compared to the conventional one. FIG. 3 is a diagram showing a comparison of isolation characteristics of an antenna (without a strip line).

第1図に示すように、実施例では裏面に導電・ナターン
による反射板が形成されたプリント基板1上に導電パタ
ーンでマイクロストリップアンテナによる送信アンテナ
2A、2B及び受信アンテナ31A、32A、31B、
32Bを形成しており。
As shown in FIG. 1, in the embodiment, transmitting antennas 2A, 2B and receiving antennas 31A, 32A, 31B, which are microstrip antennas, are formed using conductive patterns on a printed circuit board 1 on which a conductive/Naturn reflector is formed on the back surface.
It forms 32B.

この送信アンテナ2A、2B及び受信アンテナ31A、
32A、31B、32Bに少間隙をもって近接させて、
プリント基板1とは別体で形成したストリップライン4
1A、42A、41B。
These transmitting antennas 2A, 2B and receiving antenna 31A,
32A, 31B, and 32B with a small gap,
Strip line 4 formed separately from printed circuit board 1
1A, 42A, 41B.

42Bを設けている。42B is provided.

また、第1図に示す実施例は、周波数の異った2種類の
電波を使用して探知確率を上げたマルチ周波数方式の探
知器のアンテナ部であり、送信アンテナ2人、受信アン
テナ31A及び32Aが低い周波数の電波用に設けられ
た組、送信アンテナ2B、受信アンテナ31B及び32
Bが高い周波数の電波用に設けられた組である。
The embodiment shown in FIG. 1 is an antenna section of a multi-frequency detector that uses two types of radio waves with different frequencies to increase the detection probability, and includes two transmitting antennas, a receiving antenna 31A, and 32A is a set provided for low frequency radio waves, transmitting antenna 2B, receiving antennas 31B and 32
Group B is provided for high frequency radio waves.

ストリップライン41Aは、その両端部がそれぞれ狭い
間隙dを隔てて送信アンテナ2人及び受信アンテナ31
Aの一辺だ近接する状態で設けられており、また、もう
一方のストリップライン42Aは、その両端部が上記と
同じ間隙dを隔てて送信アンテナ2人及び受信アンテナ
32Aの上記と対向する一辺に近接して設けられており
、送信アンテナ2人と受信アンテナ31A、32A及び
ストリップライン41A、42Aとの間は電気的には結
合された状態にある。
The strip line 41A has two transmitting antennas and a receiving antenna 31 at both ends thereof, separated by a narrow gap d.
The other strip line 42A is provided close to one side of A, and the other end of the strip line 42A is connected to one side of the two transmitting antennas and the receiving antenna 32A opposite to the above with the same gap d as above. The two transmitting antennas, the receiving antennas 31A and 32A, and the strip lines 41A and 42A are electrically coupled to each other.

ストリップライン41A及び42Aの長さtは、当該ス
トリップライン41A及び42Aを介して送信アンテナ
2人から受信アンテナ31A及び32Aに入力される電
波と、漏れ込みてよって送信アンテナ2人から受信アン
テナ31A、32Aに入力される電波とが逆位相となる
ように設定され、また、ストリップライン41A及び4
2Aと送信アンテナ2人及び受信アンテナ31^、32
Aとの間の間隙dは、当該ストリップラインを介して伝
わる電波のレベルて関係し、上記双方の電波が略同レベ
ルになるように設定される。
The length t of the strip lines 41A and 42A is such that the radio waves input from the two transmitting antennas to the receiving antennas 31A and 32A via the strip lines 41A and 42A, and the radio waves that leak from the two transmitting antennas to the receiving antenna 31A, The radio waves input to 32A are set to have opposite phase, and the strip lines 41A and 4
2A and two transmitting antennas and receiving antennas 31^, 32
The gap d between A and A is related to the level of radio waves transmitted through the strip line, and is set so that both radio waves are at approximately the same level.

上記のようだ設定すると、実施例の場合、ストリップラ
イン41A、42Aの両端は送信アンテナ2人及び受信
アンテナ31A、32Aの辺の略中心部まで伸延する。
With the above settings, in the embodiment, both ends of the strip lines 41A and 42A extend to approximately the center of the sides of the two transmitting antennas and the receiving antennas 31A and 32A.

また、当該ス) IJッゾライン41A、42Aば、そ
の両端がプリント基板1の裏面に形成された反射板に接
続される。
In addition, both ends of the IJ lines 41A and 42A are connected to a reflecting plate formed on the back surface of the printed circuit board 1.

以上は周波数の低いアンテナの組について述べたが、周
波数の高いアンテナの組、すなわち、送信アンテナ2B
、受信アンテナ31B、32B及びストリップライン4
1B、42Bでなる組九ついても前記周波数の低いアン
テナの組と同様の関係に設定される。
The above has described a set of antennas with a low frequency, but a set of antennas with a high frequency, that is, transmitting antenna 2B.
, receiving antennas 31B, 32B and strip line 4
Group 9 consisting of 1B and 42B is also set in the same relationship as the pair of low frequency antennas.

以上のように設定することで送信アンテナ2人(2B)
から受信アンテナ31 A 、 32 A (31B。
By setting as above, two transmitting antennas (2B)
From receiving antennas 31A, 32A (31B.

32B)に漏れ込む電波は、それぞれス) IJツブラ
イン41A、42A(41B、42B)を介して伝わる
電波によって相殺されるので、受信機に入力される漏れ
込み電波のレベルは非常に低くなる。
The radio waves leaking into the receiver 32B) are canceled out by the radio waves transmitted through the IJ tube lines 41A and 42A (41B and 42B), respectively, so the level of the leaking radio waves input to the receiver becomes extremely low.

上記実施例のアインレーシ、ン特性は、第2図(へ)に
示すように−30dB乃至−40dBを得ることができ
た。これに対して従来のもの(ストリップラインのない
もの)では、第2図(ト)に示すように一20dBa度
であり、本発明を実施することによって送信、受信アン
テナ間のアイソレーションが大巾に改善されることがわ
かる。
As shown in FIG. 2, the in-receiver characteristic of the above embodiment was -30 dB to -40 dB. On the other hand, in the conventional type (one without a strip line), the level is -20 dBa as shown in Figure 2 (G), but by implementing the present invention, the isolation between the transmitting and receiving antennas can be greatly improved. It can be seen that this is improved.

本発明は、アンテナが1組のもの又は送信アンテナ及び
受信アンテナがそれぞれ1個ずつ設けられたものに於い
ても実施できる。すなわち、一般に送信アンテナ及び受
信アンアナがそれぞれ少くとも1個ずつ設けられていれ
ば本発明?実施することができる。
The present invention can be implemented with one set of antennas or with one transmitting antenna and one receiving antenna. In other words, in general, if at least one transmitting antenna and one receiving antenna are provided, the present invention is applicable? It can be implemented.

(発明の効果) 以上、詳細に説明したように、本発明は、送信アンテナ
、受信アンテナ間にストリップラインを設け、漏れ込み
電波を当該ストリップラインを介した電波で相殺するよ
うにしたものであり、送信。
(Effects of the Invention) As explained above in detail, the present invention provides a strip line between a transmitting antenna and a receiving antenna, and cancels leaking radio waves with radio waves passing through the strip line. ,send.

受信アンテナ間のアイソレーションを極めて簡単な構造
によって高めることができ、従って送信。
The isolation between the receiving antennas can be increased by an extremely simple structure, and therefore the transmitting antennas.

受信アンテナ間の間隔を短く設定でき、%て埋設物探知
器の如く、送信アンテナと受信アンテナとが接近して設
けられる機器に対して本発明は極めて大きな効果を奏す
るものである。
The distance between the receiving antennas can be set short, and the present invention is extremely effective for equipment in which the transmitting antenna and the receiving antenna are installed close to each other, such as a buried object detector.

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

第1図は、本発明の実施例の構造を示す平面図、第2図
は本発明の実施例の特性を従来例の特性との比較によっ
て示した図、第3図は地中埋設物探知器に於ける電波の
伝達状態を説明する図であるO(主な記号) 1・・・プリント基板   2A、2B・・・送信アン
テナ31A、32A、31B、32B・・・受信アンテ
ナ41A、42A、41B、42B・・・ストリップラ
イン第1図 第2図 電fc盾り1赦
Fig. 1 is a plan view showing the structure of an embodiment of the present invention, Fig. 2 is a diagram showing the characteristics of the embodiment of the present invention in comparison with the characteristics of a conventional example, and Fig. 3 is a diagram showing underground object detection. O (main symbols) 1...Printed circuit board 2A, 2B...Transmitting antennas 31A, 32A, 31B, 32B...Receiving antennas 41A, 42A, 41B, 42B... Strip line Figure 1 Figure 2 Electric fc shield 1 par

Claims (1)

【特許請求の範囲】 1 送信アンテナから送出した電波の地中埋設物による
反射波を受信アンテナで受信することにより上記埋設物
の存在を探知するようにした地中埋設物探知器に於いて
、上記送信アンテナと上記受信アンテナの双方に少間隙
をもって近接するストリップラインを設け、このストリ
ップラインを介して上記送信アンテナから上記受信アン
テナに入力される電波と、上記送信アンテナから受信ア
ンテナに直接入力される漏れ込み電波とが互に逆位相で
、かつ同レベルとなるように、上記ストリップラインの
長さ及び上記少間隙の寸法を設定した埋設物探知器用ア
ンテナ。 2 送信アンテナ及び受信アンテナがマイクロストリッ
プアンテナである特許請求の範囲第1項に記載の埋設物
探知器用アンテナ。
[Scope of Claims] 1. An underground object detector configured to detect the presence of underground objects by receiving reflected waves from the underground objects of radio waves transmitted from a transmitting antenna with a receiving antenna, A strip line is provided close to both the transmitting antenna and the receiving antenna with a small gap, and radio waves are input from the transmitting antenna to the receiving antenna via the strip line, and radio waves are directly input from the transmitting antenna to the receiving antenna. The length of the strip line and the dimensions of the small gap are set so that the leaking radio waves are in opposite phases and at the same level. 2. An antenna for a buried object detector according to claim 1, wherein the transmitting antenna and the receiving antenna are microstrip antennas.
JP60236893A 1985-10-23 1985-10-23 Antenna for buried object detector Expired - Lifetime JPH0690274B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60236893A JPH0690274B2 (en) 1985-10-23 1985-10-23 Antenna for buried object detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60236893A JPH0690274B2 (en) 1985-10-23 1985-10-23 Antenna for buried object detector

Publications (2)

Publication Number Publication Date
JPS6296881A true JPS6296881A (en) 1987-05-06
JPH0690274B2 JPH0690274B2 (en) 1994-11-14

Family

ID=17007325

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60236893A Expired - Lifetime JPH0690274B2 (en) 1985-10-23 1985-10-23 Antenna for buried object detector

Country Status (1)

Country Link
JP (1) JPH0690274B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5841401A (en) * 1996-08-16 1998-11-24 Raytheon Company Printed circuit antenna
JP2009284401A (en) * 2008-05-26 2009-12-03 Toto Ltd Microstrip antenna

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5467356A (en) * 1977-10-28 1979-05-30 Ball Corp Method of separating radio frequency and antenna system therefor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5467356A (en) * 1977-10-28 1979-05-30 Ball Corp Method of separating radio frequency and antenna system therefor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5841401A (en) * 1996-08-16 1998-11-24 Raytheon Company Printed circuit antenna
JP2009284401A (en) * 2008-05-26 2009-12-03 Toto Ltd Microstrip antenna

Also Published As

Publication number Publication date
JPH0690274B2 (en) 1994-11-14

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