JPH03194482A - Method and device for magnetic field wave measurement - Google Patents

Method and device for magnetic field wave measurement

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Publication number
JPH03194482A
JPH03194482A JP33106089A JP33106089A JPH03194482A JP H03194482 A JPH03194482 A JP H03194482A JP 33106089 A JP33106089 A JP 33106089A JP 33106089 A JP33106089 A JP 33106089A JP H03194482 A JPH03194482 A JP H03194482A
Authority
JP
Japan
Prior art keywords
magnetic field
printed wiring
layer
wiring board
intensity
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.)
Pending
Application number
JP33106089A
Other languages
Japanese (ja)
Inventor
Yoshiro Katsuyama
芳郎 勝山
Fumio Tsuzuki
都築 文夫
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP33106089A priority Critical patent/JPH03194482A/en
Publication of JPH03194482A publication Critical patent/JPH03194482A/en
Pending legal-status Critical Current

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  • Measuring Magnetic Variables (AREA)

Abstract

PURPOSE:To accurately and speedily measure the generation place and intensity of a magnetic wave generated by a printed wiring board by providing a shield plate which is constituted by laminating metallic foil on an insulating layer while its insulating layer side faces the printed wiring board. CONSTITUTION:A shield box 22 has an opening 22a formed of four-layered printed wiring boards whose conductor layers are isolated by insulators. Then the printed wiring boards 10 are inserted into the shield box 22 as shown by an arrow A and the printed wiring boards 10 are fed with electricity to operate. Then while a matrix switch means 10 switches loop antennas 36 electronically, magnetic field waves detected by the respective loop antennas 36 are measured as radio wave intensity by an electric field intensity meter 32. Then this electric field intensity is converted into magnetic field intensity according to a specific conversion expression to measure the generation position and intensity of the magnetic field wave generated from the printed wiring plate 10.

Description

【発明の詳細な説明】 概要 磁界被測定方法及び装置に関し、 プリント配線板から発生する磁界波の発生箇所及び強度
を正確に測定する方法及び装置を提供することを目的と
し、 プリント配線板から発生する磁界波の発生位置及び強度
を測定する方法であって、プリント配線板に対向して絶
縁層上に金属箔を積層して構成した遮蔽板を、該絶縁層
側をプリント配線板に対向させて設け、ループ状に形成
した金属箔の両側を絶縁物で被覆して構成したループア
ンテナを磁界検出手段に接続し、前記プリント配線板に
通電し、前記ループアンテナを前記遮蔽板に接触させな
がら移動して、前記磁界検出手段により磁界波の発生位
置及び強度を測定するように構成する。
[Detailed Description of the Invention] Summary Regarding a method and device for measuring magnetic fields, the present invention aims to provide a method and device for accurately measuring the location and intensity of magnetic field waves generated from a printed wiring board. A method for measuring the generation position and intensity of magnetic field waves, which comprises placing a shielding plate formed by laminating metal foil on an insulating layer facing a printed wiring board, with the insulating layer side facing the printed wiring board. A loop antenna formed by covering both sides of a metal foil formed in a loop shape with an insulating material is connected to a magnetic field detection means, the printed wiring board is energized, and the loop antenna is brought into contact with the shielding plate. The device is configured to move and measure the generation position and intensity of the magnetic field wave using the magnetic field detection means.

産業上の利用分野 本発明はプリント配線板から発生する磁界波の発生箇所
及び強度を測定する磁界被測定方法及び装置に関する。
INDUSTRIAL APPLICATION FIELD The present invention relates to a magnetic field measuring method and apparatus for measuring the location and intensity of magnetic field waves generated from a printed wiring board.

近年、高度情報化社会の進展と共に、様々な無線機器、
電気機器が普及し、これらの相互の間で電磁的な結合が
起こり、電子機器等の機能が障害を受ける不要電波障害
が発生し、社会的にも大きな問題となっている。このた
め、不要電波による障害を防止し、各種機器の信頼性・
安全性、またトータルな経済性を実現していくためには
電磁環境の整備が必要であり、電波を出す側と受ける側
とのバランス、所謂電磁環境における両立性(EMC)
の視点に立って検討していくことが重要である。
In recent years, with the development of an advanced information society, various wireless devices,
BACKGROUND OF THE INVENTION As electric devices become widespread, electromagnetic coupling occurs between these devices, causing unnecessary radio wave interference that impedes the functions of electronic devices and the like, which has become a major social problem. This prevents interference caused by unnecessary radio waves and improves the reliability of various devices.
In order to achieve safety and total economic efficiency, it is necessary to improve the electromagnetic environment, and the balance between the side that emits and the side that receives radio waves, so-called electromagnetic environment compatibility (EMC).
It is important to consider this from this perspective.

このため各国では電磁干渉(EMI)の規制値を設定し
、EMIが規制値以下でなければ電子機器を販売できな
いような対策をしている。
For this reason, each country has set regulatory values for electromagnetic interference (EMI), and is taking measures to ensure that electronic devices cannot be sold unless the EMI is below the regulatory value.

EMIの中でも磁界波に対する対策は非常に難しく、発
生源のプリント配線板全体を強磁性体で囲んで装置から
発生する磁界波を減少するようにしているのが一般的で
ある。しかし、−船釣にプリント配線板の中でも一部の
みが特に磁界波を発生しており、その部分のみを強磁性
体でシールドすれば、磁界波を規制値以下に抑えること
ができる。
Among the types of EMI, countermeasures against magnetic field waves are extremely difficult, and it is common practice to surround the entire printed wiring board, which is the generation source, with a ferromagnetic material to reduce the magnetic field waves generated from the device. However, only a part of the printed wiring board especially when fishing on a boat generates magnetic field waves, and if only that part is shielded with a ferromagnetic material, the magnetic field waves can be suppressed to below the regulation value.

そこで、プリント配線板から発生する磁界波の発生箇所
及び強度を簡単に正確に測定することのできる測定方法
及び装置が要望されている。
Therefore, there is a need for a measuring method and apparatus that can easily and accurately measure the location and intensity of magnetic field waves generated from printed wiring boards.

従来の技術 従来の磁界被測定方法を第8図に示す。従来の測定方法
では、電界強度計6に接続したループアンテナ4をプリ
ント配線板2に近接させて移動することにより、プリン
ト配線板2から発生する磁界波を測定するようにしてい
た。電界強度計6で磁界波の電界強度を測定し、この電
界強度から所定の換算式により磁界強度を得るようにし
ている。
BACKGROUND OF THE INVENTION A conventional method for measuring magnetic fields is shown in FIG. In the conventional measurement method, the magnetic field waves generated from the printed wiring board 2 are measured by moving the loop antenna 4 connected to the electric field strength meter 6 close to the printed wiring board 2. The electric field strength of the magnetic field wave is measured with an electric field strength meter 6, and the magnetic field strength is obtained from this electric field strength using a predetermined conversion formula.

発明が解決しようとする課題 従来の磁界被測定方法では、実線で示す磁界波5だけで
なく、プリント配線板2とループアンテナ4との間の容
量により、破線7て示す電界波も同時に測定していた。
Problems to be Solved by the Invention In the conventional magnetic field measurement method, not only the magnetic field wave 5 shown by the solid line but also the electric field wave shown by the broken line 7 is measured at the same time due to the capacitance between the printed wiring board 2 and the loop antenna 4. was.

そのため、スペクトラムアナライザ上の波形は電界と磁
界の和となり、磁界波発生位置及び強度を正確に測定す
るのは非常に困難であった。
Therefore, the waveform on the spectrum analyzer is the sum of the electric field and the magnetic field, making it extremely difficult to accurately measure the magnetic field wave generation position and intensity.

本発明はこのような点に鑑みてなされたものであり、そ
の目的とするところは、プリント配線板から発生する磁
界波の発生箇所及び強度を正確に測定することのできる
磁界被測定方法及び装置を提供することである。
The present invention has been made in view of the above points, and its purpose is to provide a magnetic field measurement method and device that can accurately measure the location and intensity of magnetic field waves generated from a printed wiring board. The goal is to provide the following.

課題を解決するだめの手段 第1図に示した本発明の原理説明図を参照しながら説明
する。
Means for solving the problem will be explained with reference to the diagram illustrating the principle of the present invention shown in FIG.

プリント配線板lOに対向して絶縁層14上に金属箔1
6を積層して構成した遮蔽板12を、絶縁層14側をプ
リント配線板10に対向させて設け、ループ状に形成し
た金属箔の両側を絶縁物で被覆して構成したループアン
テナ18を磁界検出手段20に接続する。測定時にはプ
リント配線板10に通電してプリント配線板を動作させ
、ループアンテナ18を遮蔽板12に接触させながら移
動して、磁界検出手段20により磁界波の発生位置及び
強度を測定する。
A metal foil 1 is placed on the insulating layer 14 facing the printed wiring board IO.
A shielding plate 12 formed by laminating 6 is provided with the insulating layer 14 side facing the printed wiring board 10, and a loop antenna 18 formed by covering both sides of a metal foil formed in a loop shape with an insulating material is connected to a magnetic field. Connect to the detection means 20. During measurement, the printed wiring board 10 is energized to operate, the loop antenna 18 is moved while being in contact with the shielding plate 12, and the magnetic field detection means 20 measures the generation position and intensity of the magnetic field wave.

また、磁界被測定装置としては、各導電体層の間が絶縁
体で隔離された4層の導電体層を具備し、開口を有する
シールド箱内に測定すべきプリント配線板を挿入して、
磁界検出手段によりプリント配線板から発生する磁界波
の発生位置及び強度を測定する装置を利用する。このシ
ールド箱は、シールド箱の内側から数えて第1層を電界
遮蔽用の金属箔から形成し、第2層に二次元的に多数配
列したループアンテナを設け、第3層にインピーダンス
マツチング用の金属箔を設け、第4層に各々のループア
ンテナの出力信号を伝送するための伝送線路を設けると
ともに、第2層の各々のループアンテナと第4層の各々
の伝送線路とをビアホールで接続して構成する。そして
、各伝送線路をコネクタを介してマトリックス・スイッ
チ手段に接続し、このマトリックス・スイッチ手段を磁
界検出手段に接続する。
The device to be measured for magnetic field is equipped with four conductive layers with each conductive layer separated by an insulator, and a printed wiring board to be measured is inserted into a shield box having an opening.
A device is used that uses magnetic field detection means to measure the position and intensity of magnetic field waves generated from a printed wiring board. In this shield box, counting from the inside of the shield box, the first layer is made of metal foil for shielding electric fields, the second layer is provided with a large number of two-dimensionally arranged loop antennas, and the third layer is made of metal foil for impedance matching. A transmission line for transmitting the output signal of each loop antenna is provided in the fourth layer, and each loop antenna in the second layer is connected to each transmission line in the fourth layer with a via hole. and configure. Each transmission line is then connected to matrix switch means via a connector, and this matrix switch means is connected to magnetic field detection means.

上述したシールド箱内に測定すべきプリント配線板を挿
入する構成に代えて、第1層から第4層までの積層順序
を完全に逆にして/−ルド箱を形成し、シールド釉上に
測定すべきプリント配線板を載置するようにしても良い
Instead of inserting the printed wiring board to be measured into the shield box as described above, the stacking order from the first layer to the fourth layer is completely reversed to form a shield box, and the measurement is carried out on the shield glaze. Alternatively, a printed wiring board to be printed may be placed thereon.

作   用 第2図は電界及び磁界の遮蔽板による反射損失の関係を
示すグラフであり、このグラフから明らかなように、近
傍電磁界において遮蔽板に入射する電磁波の反射損失を
考えた場合、電界波の反射損失は非常に大きく、磁界波
の反射損失は小さいことが分かる。本発明の磁界被測定
方法はこの知見に基づいたもので、測定すべきプリント
配線板に対向して遮蔽板を設け、ループアンテナを遮蔽
板に接触させながら移動することにより、電界波は遮蔽
板により殆ど反射されるため、遮蔽板を通過する磁界波
のみを測定することができる。
Figure 2 is a graph showing the relationship between the reflection loss of electric and magnetic fields due to the shielding plate.As is clear from this graph, when considering the reflection loss of electromagnetic waves incident on the shielding plate in the nearby electromagnetic field, the electric field It can be seen that the reflection loss of waves is very large, while the reflection loss of magnetic field waves is small. The magnetic field measurement method of the present invention is based on this knowledge.A shielding plate is provided opposite the printed wiring board to be measured, and the loop antenna is moved while being in contact with the shielding plate. Since most of the waves are reflected by the shielding plate, only the magnetic field waves that pass through the shielding plate can be measured.

本発明では金属箔を用いた平面状ループアンテナを使用
しているが、これは、薄い金属箔のループアンテナを遮
蔽板にできるかぎり接近させると、遮蔽板表面の極めて
微弱な磁界波の磁束もループを鎖交し電圧が誘起され微
小な磁界波も測定できるためである。
The present invention uses a planar loop antenna using metal foil, which means that when the thin metal foil loop antenna is brought as close as possible to the shielding plate, the magnetic flux of the extremely weak magnetic field waves on the surface of the shielding plate is also reduced. This is because a voltage is induced across the loop and even minute magnetic field waves can be measured.

本発明の磁界被測定装置では、シールド箱の構成に応じ
てシールド箱内に測定すべきプリント配線板を挿入する
か又はシールド釉上にプリント配線板を載置し、マトリ
ックス・スイッチ手段により磁界被測定装置に接続すべ
きループアンテナを切り換えて、プリント配線板から発
生する磁界波の発生位置及び強度を測定する。本発明の
磁界被測定装置を使用することにより、電界波に干渉さ
れることなくプリント配線板から発生する磁界波の発生
位置及び強度を迅速に且つ正確に測定することができる
In the magnetic field measurement device of the present invention, the printed wiring board to be measured is inserted into the shielding box depending on the configuration of the shielding box, or the printed wiring board is placed on the shielding glaze, and the magnetic field is exposed to the magnetic field by the matrix switch means. The loop antenna to be connected to the measuring device is switched to measure the position and intensity of the magnetic field waves generated from the printed wiring board. By using the magnetic field measurement device of the present invention, the generation position and intensity of magnetic field waves generated from a printed wiring board can be quickly and accurately measured without being interfered with by electric field waves.

実  施  例 以下、本発明の実施例を図面を参照して詳細に説明する
Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

第3図は本発明に係る磁界波測定装置の実施例概略斜視
図であり、22は各導電体層の間が絶縁体で隔離された
4層のプリント配線板から形成された開口22aを有す
るシールド箱であり、このシールド箱22の後述する各
々の伝送線路はコネクタ24.26及び同軸ケーブル2
8を介してマトリックス・スイッチ手段30に接続され
ており、このマトリックス・スイッチ手段30は電界強
度計32に接続されている。
FIG. 3 is a schematic perspective view of an embodiment of the magnetic field wave measurement device according to the present invention, and 22 has an opening 22a formed from a four-layer printed wiring board with each conductive layer separated by an insulator. This shield box 22 is a shield box, and each transmission line (described later) is connected to a connector 24, 26 and a coaxial cable 2.
8 to matrix switch means 30, which in turn is connected to a field strength meter 32.

第4図を参照すると、シールド箱22の導電体層は4層
から構成されており、その内側から数えて第1層として
電界遮蔽用の銅箔等の金属箔34が設けられている。3
6は二次元的に多数配列した平面状ループアンテナであ
り、第2層を構成する。また、第3層としてインピーダ
ンスマツチング用の銅箔等の金属箔38が設けられてお
り、最上層の第4層に各々のループアンテナ36の出力
信号を伝送するた約の伝送線路40が形成されている。
Referring to FIG. 4, the conductor layer of the shield box 22 is composed of four layers, and as the first layer counted from the inside thereof, a metal foil 34 such as copper foil for shielding an electric field is provided. 3
Reference numeral 6 indicates a large number of planar loop antennas arranged two-dimensionally, and constitutes the second layer. Further, a metal foil 38 such as copper foil for impedance matching is provided as the third layer, and a transmission line 40 for transmitting the output signal of each loop antenna 36 is formed in the fourth layer, which is the uppermost layer. has been done.

第3層としてインピーダンスマツチング用の金属箔38
が設けられているために、伝送線路40に磁界波がカッ
プリングするのを防止することができる。各々のループ
アンテナ36と第4層として設けた各々の伝送線路40
とはビアホール42で接続されている。そして、シール
ド箱22の内外層はソルダーレジス)44.46で被覆
されており、各導電体層の間はエポキシ樹脂48で隔離
されている。
Metal foil 38 for impedance matching as the third layer
is provided, it is possible to prevent magnetic field waves from coupling to the transmission line 40. Each loop antenna 36 and each transmission line 40 provided as a fourth layer
is connected to via a via hole 42. The inner and outer layers of the shield box 22 are covered with solder resists 44 and 46, and the conductor layers are separated by epoxy resin 48.

次に第5図を参照すると、ループアンテナ概略図が示さ
れている。最大の測定レベルを得るためには、ループア
ンテナをできるだけ薄くし、遮蔽板(第4図の金属箔3
4)に接近させる必要がある。そこで、フレキシブル基
板50上にエツチングによりループパターンを形成する
ことにより薄いループアンテナ36とした。
Referring now to FIG. 5, a schematic diagram of a loop antenna is shown. In order to obtain the maximum measurement level, the loop antenna should be made as thin as possible and a shield plate (metal foil 3 in Figure 4) should be used.
4). Therefore, a thin loop antenna 36 was obtained by forming a loop pattern on the flexible substrate 50 by etching.

然して、プリント配線板10から発生する磁界波の測定
を行うには、まずプリント配線板10を矢印Aに示すよ
うにシールド箱22中に挿入し、プリント配線板10に
通電してプリント配線板を動作させる。そして、マトリ
ックス・スイッチ手段30によりループアンテナ36を
電子的に切換えながら、各々のループアンテナ36で検
出した磁界波を電波強度として電界強度計32で計測す
る。そして、この電界強度を所定の換算式に応じて磁界
強度に変換し、プリント配線板10から発生する磁界波
の発生位置及びその強度を測定することができる。
However, in order to measure the magnetic field waves generated from the printed wiring board 10, the printed wiring board 10 is first inserted into the shield box 22 as shown by arrow A, and the printed wiring board 10 is energized to close the printed wiring board. make it work. Then, while the loop antennas 36 are electronically switched by the matrix switch means 30, the magnetic field waves detected by each loop antenna 36 are measured as radio wave intensity by the field strength meter 32. Then, this electric field strength is converted into a magnetic field strength according to a predetermined conversion formula, and the generation position and the strength of the magnetic field waves generated from the printed wiring board 10 can be measured.

第6図を参照すると、他の実施例の概略斜視図が示され
ている。この実施例においてはシールド箱52における
導電体層の積層順序を上述した第1実施例と全く逆にし
、シールド箱52の外側から数えて第1層に電界遮蔽用
の金属箔を、第2層にループアンテナを、第3層にイン
ピーダンスマツチング用の金属箔を、第4層に伝送線路
をそれぞれ設けている。そして、シールド箱52の伝送
線路をコネクタ24.26及び同軸ケーブル28ヲ介し
てマトリックス・スイッチ手段30に接続し、このマト
リックス・スイッチ手段30を電界強度計32に接続し
ている構成は、上述した第1実施例と同様である。
Referring to FIG. 6, a schematic perspective view of another embodiment is shown. In this embodiment, the stacking order of the conductive layers in the shield box 52 is completely reversed from that of the first embodiment, and the first layer counting from the outside of the shield box 52 is a metal foil for electric field shielding, and the second layer is a metal foil for shielding an electric field. A loop antenna is provided on the top layer, a metal foil for impedance matching is provided on the third layer, and a transmission line is provided on the fourth layer. The transmission line of the shield box 52 is connected to the matrix switch means 30 via the connectors 24, 26 and the coaxial cable 28, and the matrix switch means 30 is connected to the electric field strength meter 32 as described above. This is the same as the first embodiment.

この実施例においては、プリント配線板10を矢印Bの
如くシールド箱52上に載置し、マトリックス・スイッ
チ手段30によりループアンテナを電子的に切換えるこ
とにより、プリント配線板10から発生する磁界波の発
生位置及び強度を電界強度計32により測定することが
できる。
In this embodiment, the printed wiring board 10 is placed on the shield box 52 as shown by arrow B, and the loop antenna is electronically switched by the matrix switch means 30, thereby controlling the magnetic field waves generated from the printed wiring board 10. The generation position and intensity can be measured by the electric field strength meter 32.

第7図に第8図に示した従来方法と本発明方法による磁
界波検出波形を示す。上段の波形(A)は従来方法の検
出波形を示しており、磁界波のみでなく電界波も検出し
ているため、磁界波の発生位置及び強度の検出が困難に
なっている。一方、下段に示す波形(B)は本発明方法
による検出波形であり、遮蔽板により電界波を遮蔽して
いるため、磁界波を選択的に検出することができ、8M
Hzの磁界波及びその高調波のみを検出しているため、
プリント配線板から発生する磁界波の発生位置及びその
強度を容易に測定することができる。
FIG. 7 shows magnetic field wave detection waveforms according to the conventional method shown in FIG. 8 and the method of the present invention. The upper waveform (A) shows the detection waveform of the conventional method, which detects not only magnetic field waves but also electric field waves, making it difficult to detect the generation position and intensity of the magnetic field waves. On the other hand, the waveform (B) shown in the lower row is the detected waveform by the method of the present invention, and since the electric field waves are shielded by the shielding plate, the magnetic field waves can be selectively detected.
Since only Hz magnetic field waves and their harmonics are detected,
The generation position and intensity of magnetic field waves generated from a printed wiring board can be easily measured.

発明の効果 本発明の磁界波の測定方法及び装置は以上詳述したよう
に構成したので、プリント配線板から発生する磁界波の
発生箇所及び強度を正確に且つ迅速に測定することがで
きるという効果を奏する。
Effects of the Invention Since the method and apparatus for measuring magnetic field waves of the present invention are configured as detailed above, the effect is that the generation location and intensity of magnetic field waves generated from a printed wiring board can be accurately and quickly measured. play.

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

第1図は本発明の原理説明図、 第2図は電界及び磁界の遮蔽板による反射損失の関係を
示すグラフ、 第3図は本発明実施例の概略斜視図、 第4図は第3図のIV−rV線断面図、第5図はループ
アンテナ概略図、 第6図は本発明の他の実施例概略斜視図、第7図は従来
方法(A)と本発明方法(B)の磁界波検出波形図、 第8図は従来の磁界波検出方法説明図である。 IQ・・・プリント配線板、 12・・・遮蔽板、 18.36・・・ループアンテナ、 20・・・磁界検出手段、 22.52・・・シールド箱、 30・・・マトリックス・スイッチ手段、32・・・電
界強度計、 34・・・遮蔽用金属箔、 38・・・インピーダンスマツチング用金属箔、40・
・・信号伝送路、 42・・・ビアホール。
Fig. 1 is an explanatory diagram of the principle of the present invention, Fig. 2 is a graph showing the relationship between reflection loss due to electric field and magnetic field shielding plates, Fig. 3 is a schematic perspective view of an embodiment of the present invention, and Fig. 4 is Fig. 3. FIG. 5 is a schematic diagram of a loop antenna, FIG. 6 is a schematic perspective view of another embodiment of the present invention, and FIG. 7 is a magnetic field of conventional method (A) and method of the present invention (B). Wave Detection Waveform Diagram FIG. 8 is an explanatory diagram of a conventional magnetic field wave detection method. IQ... Printed wiring board, 12... Shielding plate, 18.36... Loop antenna, 20... Magnetic field detection means, 22.52... Shield box, 30... Matrix switch means, 32... Electric field strength meter, 34... Metal foil for shielding, 38... Metal foil for impedance matching, 40.
...Signal transmission path, 42...Beer hole.

Claims (1)

【特許請求の範囲】 1、プリント配線板(10)から発生する磁界波の発生
位置及び強度を測定する方法であって、プリント配線板
(10)に対向して絶縁層(14)上に金属箔(16)
を積層して構成した遮蔽板(12)を、該絶縁層(14
)側をプリント配線板(10)に対向させて設け、 ループ状に形成した金属箔の両側を絶縁物で被覆して構
成したループアンテナ(18)を磁界検出手段(20)
に接続し、 前記プリント配線板(10)に通電し、前記ループアン
テナ(18)を前記遮蔽板(12)に接触させながら移
動して、 前記磁界検出手段(20)により磁界波の発生位置及び
強度を測定することを特徴とする磁界波測定方法。 2、各導電体層の間が絶縁体で隔離された4層の導電体
層を具備し、開口(22a)を有するシールド箱(22
)内に測定すべきプリント配線板(10)を挿入して該
プリント配線板(10)から発生する磁界波の発生位置
及び強度を測定する装置であって、前記シールド箱(2
2)の内側から数えて第1層を電界遮蔽用の金属箔(3
4)から形成し、 第2層に二次元的に多数配列したループアンテナ(36
)を設け、 第3層にインピーダンスマッチング用の金属箔(38)
を設け、 第4層に各々のループアンテナ(36)の出力信号を伝
送するための伝送線路(40)を設けるとともに、第2
層の各々のループアンテナ(36)と第4層の各々の伝
送線路(40)をビアホール(42)で接続し、各伝送
線路(40)をコネクタ(24、26)を介してマトリ
ックス・スイッチ手段(30)に接続し、該マトリック
ス・スイッチ手段(30)を磁界検出手段(32)に接
続したことを特徴する磁界波測定装置。 3、各導電体層の間が絶縁体で隔離された4層の導電体
層を具備したシールド箱(52)上に測定すべきプリン
ト配線板(10)を載置して該プリント配線板(10)
から発生する磁界波の発生位置及び強度を測定する装置
であって、 前記シールド箱(52)の外側から数えて第1層を電界
遮蔽用の金属箔(34)から形成し、 第2層に二次元的に多数配列したループアンテナ(36
)を設け、 第3層にインピーダンスマッチング用の金属箔(38)
を設け、 第4層に各々のループアンテナ(36)の出力信号を伝
送するための伝送線路(40)を設けるとともに、第2
層の各々のループアンテナ(36)と第4層の各々の伝
送線路(40)をビアホール(42)で接続し、各伝送
線路(40)をコネクタ(24、26)を介してマトリ
ックス・スイッチ手段(30)に接続し、該マトリック
ス・スイッチ手段(30)を磁界検出手段(32)に接
続したことを特徴する磁界波測定装置。
[Claims] 1. A method for measuring the generation position and intensity of magnetic field waves generated from a printed wiring board (10), the method comprising: foil (16)
The shielding plate (12) is constructed by laminating the insulating layer (14).
) side facing the printed wiring board (10), and a loop antenna (18) constructed by covering both sides of a loop-shaped metal foil with an insulator is used as the magnetic field detection means (20).
, the printed wiring board (10) is energized, the loop antenna (18) is moved while being in contact with the shielding plate (12), and the magnetic field detection means (20) detects the generation position and the magnetic field wave. A magnetic field wave measurement method characterized by measuring intensity. 2. A shield box (22
) is an apparatus for inserting a printed wiring board (10) to be measured into the shield box (2) and measuring the generation position and intensity of magnetic field waves generated from the printed wiring board (10).
Counting from the inside of 2), cover the first layer with metal foil for electric field shielding (3).
4), and a large number of loop antennas (36
), and the third layer is a metal foil (38) for impedance matching.
A transmission line (40) for transmitting the output signal of each loop antenna (36) is provided in the fourth layer, and a second
The loop antenna (36) of each layer and each transmission line (40) of the fourth layer are connected through a via hole (42), and each transmission line (40) is connected to a matrix switch means via a connector (24, 26). (30), and the matrix switch means (30) is connected to a magnetic field detection means (32). 3. Place the printed wiring board (10) to be measured on a shield box (52) equipped with four conductive layers with insulators separating each conductive layer, and place the printed wiring board (10) 10)
A device for measuring the generation position and intensity of magnetic field waves generated from the shield box (52), the first layer counting from the outside of the shield box (52) is formed of a metal foil (34) for shielding the electric field, and the second layer is formed of a metal foil (34) for shielding the electric field. A large number of loop antennas arranged two-dimensionally (36
), and the third layer is a metal foil (38) for impedance matching.
A transmission line (40) for transmitting the output signal of each loop antenna (36) is provided in the fourth layer, and a second
The loop antenna (36) of each layer and each transmission line (40) of the fourth layer are connected through a via hole (42), and each transmission line (40) is connected to a matrix switch means via a connector (24, 26). (30), and the matrix switch means (30) is connected to a magnetic field detection means (32).
JP33106089A 1989-12-22 1989-12-22 Method and device for magnetic field wave measurement Pending JPH03194482A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP33106089A JPH03194482A (en) 1989-12-22 1989-12-22 Method and device for magnetic field wave measurement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP33106089A JPH03194482A (en) 1989-12-22 1989-12-22 Method and device for magnetic field wave measurement

Publications (1)

Publication Number Publication Date
JPH03194482A true JPH03194482A (en) 1991-08-26

Family

ID=18239406

Family Applications (1)

Application Number Title Priority Date Filing Date
JP33106089A Pending JPH03194482A (en) 1989-12-22 1989-12-22 Method and device for magnetic field wave measurement

Country Status (1)

Country Link
JP (1) JPH03194482A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019225539A1 (en) * 2018-05-23 2019-11-28 日本電気株式会社 Wireless communication identification device and wireless communication identification method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019225539A1 (en) * 2018-05-23 2019-11-28 日本電気株式会社 Wireless communication identification device and wireless communication identification method
JPWO2019225539A1 (en) * 2018-05-23 2021-07-08 日本電気株式会社 Wireless communication identification device, wireless communication identification method and program
US11165512B2 (en) 2018-05-23 2021-11-02 Nec Corporation Wireless communication identification device and wireless communication identification method

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