JPS6344180A - Antenna efficiecty measurement - Google Patents
Antenna efficiecty measurementInfo
- Publication number
- JPS6344180A JPS6344180A JP18690886A JP18690886A JPS6344180A JP S6344180 A JPS6344180 A JP S6344180A JP 18690886 A JP18690886 A JP 18690886A JP 18690886 A JP18690886 A JP 18690886A JP S6344180 A JPS6344180 A JP S6344180A
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- Prior art keywords
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- radio wave
- measurement
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- 238000005259 measurement Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 23
- 238000009826 distribution Methods 0.000 abstract description 22
- 230000005684 electric field Effects 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- 230000010287 polarization Effects 0.000 description 7
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は、アンテナの効率を測定するアンテナ効率測定
方法Ｖこ関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an antenna efficiency measuring method V for measuring the efficiency of an antenna.
（従来の技術）
無線機に内蔵された小形アンテナｄ、アンテナの近傍に
ある電子部品や人体などの影響によってアンテナ効率が
低下する。この種の小形アンテナの評価においてアンテ
ナ効率の測定は重要なものとなる。小形アンテナの効率
測定方法としては、原理的には全立体角してわたって放
射送力？積分することによって求められるが、携帯アン
テナが主に利用されるＶＨＦ帯において人体の影響を含
めたこの測定のためには電波無響室など、設備が犬がか
りなものが必要となり、どこでも容易７Ｃ，４Ｊ出来る
とは言い難い欠点がある。(Prior Art) The antenna efficiency decreases due to the influence of the small antenna d built into a radio device, electronic components near the antenna, the human body, and the like. Measuring antenna efficiency is important in evaluating this type of small antenna. In principle, the method to measure the efficiency of a small antenna is to measure the radiated power over the entire solid angle. This is determined by integration, but in order to measure this including the effects of the human body in the VHF band, where mobile antennas are mainly used, equipment such as a radio anechoic chamber is required, and it is easy to use 7C anywhere. , There are drawbacks that make it difficult to say that 4J is possible.
そこで上述の方法に比べて葡易し′こ夷泡できるアンテ
ナ効率測定方法のひとつとして、ランダムフィールド法
という方法が提案されている（文献１： Ｊ、Ｂ、Ａ
ｎｄｅｒｓｏｎ、ＩＥＥＥ ＶＴ−２６、％４ ｐｐ３
４９〜３５７゜ＮＯＶ、１９７７）、この方法の原理図
を第３図Ｖこ示す。Therefore, a method called the random field method has been proposed as a method for measuring antenna efficiency that is easier and more effective than the above-mentioned methods (Reference 1: J, B, A
nderson, IEEE VT-26,%4 pp3
49-357° NOV, 1977), and a diagram of the principle of this method is shown in FIG.
゛まずアンテナ効率が既知の基準アンテナ３１とアンテ
ナ効率が未知の被測定アンテナ３２を用意する。そこで
まず、基準アンテナ３１を送信アンテナとして用い、こ
れを発振器３３に接、続し、送信アンテナ３１かも受信
アンテナ３５までの伝搬路がランダムモデル（受信点に
到来する各方向からの波の位相は全くランダムであり、
かつその撮幅は各方向に対して同一であるとする理論上
の伝搬モデル）と考えられ移動ルート３４を移動させな
がら送信する。受信アンテナ３５で受信された受信電波
は電界強度測定器３６で受信式れ、マイクロコンピュー
タ３７によって受信確率分布として分析され、受信レベ
ル対受信確率分布のグラフを作成する。ここで伝搬ルー
トにおいてランダムモデルが完全に成立するならば、受
信確率はレーレ分布となる（文献１参照）、、次に被測
定アンテナ３２で同一の測定を行い、同様な受信レベル
対受信確率分布のグラフを作成し、基準アンテナの分布
との比較によるニー確率の受信レベル差から相対的なア
ンテナ効率を知ることができる。``First, a reference antenna 31 whose antenna efficiency is known and an antenna to be measured 32 whose antenna efficiency is unknown are prepared. Therefore, first, we use the reference antenna 31 as a transmitting antenna and connect it to the oscillator 33, and the propagation path from the transmitting antenna 31 to the receiving antenna 35 is a random model (the phase of waves arriving at the receiving point from each direction is It's completely random,
A theoretical propagation model assumes that the width of the image is the same in each direction), and the signal is transmitted while moving along the moving route 34. The received radio wave received by the receiving antenna 35 is received by a field strength measuring device 36, and is analyzed by a microcomputer 37 as a reception probability distribution to create a graph of reception level versus reception probability distribution. If the random model is completely established on the propagation route, the reception probability will be Lehre distribution (see Reference 1).Next, the same measurement will be performed with the antenna under test 32, and the reception level vs. reception probability distribution will be the same. The relative antenna efficiency can be determined from the reception level difference in the knee probability by comparing it with the distribution of the reference antenna.
しかしながら、本発明者が本手法を用いて屋内でアンテ
ナ効率を６１１１定したところ、測定誤差が理論的ｌこ
予想ちれる値よりも犬きくなることが分かった。この結
果を第４図に示す。同図（・こおいて４１．４２．４３
は各々、被測定アンテナを同図中に示すように、互いに
直交する３つの方向４４ 、４５ 。However, when the present inventor determined the antenna efficiency indoors using the present method, it was found that the measurement error was much larger than the theoretically predicted value. The results are shown in FIG. Same figure (・Koite 41.42.43
The antennas to be measured are shown in three directions 44 and 45 that are orthogonal to each other, respectively, as shown in the figure.
４６に設置したときの測定結果である。尚、この実験で
は被測定アンテナは固定しておき、代わシに受信アンテ
ナを１．５ｍのアームの先端に次りつけ、回転させなが
ら測定する方法をとっている。These are the measurement results when installed at 46. In this experiment, the antenna to be measured was fixed, and instead the receiving antenna was attached to the tip of a 1.5 m arm, and measurements were taken while rotating it.
アンテナ効率はアンテナに対する入力電力と全放射電力
との比Ｖこよって決定されるものであるので、本来被測
定アンテナをどの様な方向に［りいても受信確率分布は
同一の結果とならねば々らないのに対して、第４図の結
果はアンテナの設営方向により６ｄＢ程度の差がちるこ
とを表わしており、アンテナ効率の測定精度として十分
とは言えない欠点を有している。つまり、ランダムフィ
ールド法を実施する場合には、受信確率分布がレーレ分
布になることに注目することだけでは不十分である。Since antenna efficiency is determined by the ratio V of the input power to the antenna and the total radiated power, the reception probability distribution must be the same no matter what direction the antenna under test is placed. On the other hand, the results shown in FIG. 4 show that there is a difference of about 6 dB depending on the direction in which the antenna is installed, which has the drawback that the measurement accuracy of antenna efficiency is not sufficient. In other words, when implementing the random field method, it is not sufficient to simply note that the reception probability distribution is Lehre distribution.
受信確率分布が同一とならない原因は１次の様に説明で
きる。第５図は屋内に置かれた被測定アンテナ５１を示
している。５２は家屋の壁である。The reason why the reception probability distributions are not the same can be explained as follows. FIG. 5 shows an antenna to be measured 51 placed indoors. 52 is the wall of the house.
このとき受信アンテナ５３は第５図の８方向にあるとす
る。ここで被測定アンテナの水平面指向性がｉ！６図で
ｂるとき、この被測定アンテナのビーム方向（Ｘ方向）
を第５図中のａ方向に向けた場合には、被測定アンテナ
のビーム方向（Ｘ方向ンを第５図中のｂ方向に向けた場
合に比べて受信アンテナでの受信レベルが大きくなる。At this time, it is assumed that the receiving antenna 53 is located in eight directions in FIG. Here, the horizontal directivity of the antenna under test is i! When b in Figure 6, the beam direction of this antenna under test (X direction)
When the beam direction of the antenna to be measured (X direction) is directed in direction a in FIG. 5, the reception level at the receiving antenna becomes higher than when the beam direction (X direction) of the antenna to be measured is directed in direction b in FIG.
すなわち、ａ方向に伝搬するａｍが受信アンテナに至る
伝搬路において散乱・反射を受けて、その結果、受信確
率分布がレーレ分布となっても、同一確率の受信レベル
は送信アンテナのビームの方向をａとした場合と、ｂ方
向とした場合では大きく異ってしまう。てまりｂ方向に
発射された電波は、ａ方向に発射された電波よυも受信
レベルが弱くなってしまう。In other words, even if am propagating in the a direction is scattered and reflected on the propagation path leading to the receiving antenna, and as a result, the receiving probability distribution becomes Lehre distribution, the receiving level with the same probability will not follow the beam direction of the transmitting antenna. There is a big difference between the direction a and the direction b. The reception level of the radio waves emitted in the direction b will be weaker than that of the radio waves emitted in the direction a.
（発明が解決しようとする問題点）
このように従来の方法では被測定アンテナの設置方向に
よってアンテナ効率の測定結果が６ｄＢ程度異ってしま
う欠点を有していた。(Problems to be Solved by the Invention) As described above, the conventional method has the drawback that the measurement result of the antenna efficiency varies by about 6 dB depending on the installation direction of the antenna to be measured.
本発明はこのような点に鑑みてなされたもので、被測定
アンテナ及び基準アンテナの設置方向を変えても、受信
アンテナにおける受信レベルの差を少なくすることがで
き、被測定アンテナの指向性や偏波特性によらず、高利
間にアンテナ効率の測定を行うことのできるアンテナ効
率Ｊｉｌｔ定方法を提供することを目的とするものであ
る。The present invention has been made in view of these points, and even if the installation direction of the antenna under test and the reference antenna is changed, the difference in reception level at the reception antenna can be reduced, and the directivity of the antenna under test can be reduced. It is an object of the present invention to provide a Jilt method for determining antenna efficiency, which can measure antenna efficiency at a high rate regardless of polarization characteristics.
（問題点を解決するだめの手段）
本発明は上記目的を達成するために、被測定送信アンテ
ナ及び基準アンテナの囲りに金ト１体で構成された電波
散乱体を設けて測定するようｌこしたものである。(Means for Solving the Problems) In order to achieve the above object, the present invention provides a method for measuring by providing a radio wave scattering body made of a piece of metal around the transmitting antenna to be measured and the reference antenna. It is strained.
（作 用）
このような本発明によると、被測定送信アンテナ及び基
準アンテナから送信された電波は、アンテナの囲りに構
成された電波散乱体によって散乱を受けるため、アンテ
ナの設置方向の影響が軽減されるとともに、特定の偏波
が受信アンテナに強く伝搬することがないため、送信ア
ンテナの方向や偏波による受信アンテナへの受信レベル
の偏差全減少させることが出来る。従って、被測定アン
テナの指向性や偏波によるアンテナ効率の測定誤差を減
少させることができる。(Function) According to the present invention, the radio waves transmitted from the transmitting antenna to be measured and the reference antenna are scattered by the radio wave scatterers constructed around the antennas, so that the influence of the installation direction of the antennas is eliminated. In addition, since a specific polarized wave does not strongly propagate to the receiving antenna, it is possible to completely reduce the deviation in the reception level to the receiving antenna due to the direction of the transmitting antenna and polarization. Therefore, it is possible to reduce measurement errors in antenna efficiency due to directivity and polarization of the antenna to be measured.
（実施例）
第１図に本発明の一実施例を示す。同図において、１２
は被測定用又は基準用の送信アンテナであり、１３はそ
れに給電する発振器である。送信アンテナ１２の上部を
含めた周囲には電波散乱体１１が配置され℃いる。この
電波散乱体１１は面積、形状が任意の複数の金属板によ
って構成されており１例えば天井よシ吊υ下げられてい
る。(Example) FIG. 1 shows an example of the present invention. In the same figure, 12
1 is a transmitting antenna for measurement or a reference, and 13 is an oscillator that supplies power thereto. A radio wave scatterer 11 is arranged around the transmitting antenna 12 including the upper part thereof. The radio wave scatterer 11 is made up of a plurality of metal plates having arbitrary areas and shapes, and is suspended from the ceiling, for example.
一方、この送信アンテナ１２から送信される電波を受信
する受信アンテナ１４はアーム１８の先端に取着され、
モータ１９によってアーム１８とともに回転される。受
信アンテナ１４Ｖこより受信された電波は、電界強Ｗ
夕１１定器１６とマイクロコンピュータ１７によって構
成されるな界強度分析器１５に供給される。On the other hand, a receiving antenna 14 that receives radio waves transmitted from the transmitting antenna 12 is attached to the tip of the arm 18.
It is rotated together with the arm 18 by a motor 19. The radio waves received from the receiving antenna 14V have a strong electric field W
The signal is supplied to a field strength analyzer 15 constituted by a detector 16 and a microcomputer 17.
アンテナ効率の測定にあたっては、まず基準アンテナを
前記電波散乱体１１で囲まれた内部におき、発振器によ
シ給電して電波を送信する。そして、この送信電波を、
回転する受信アンテナ１４によ）受信し、電界強度分析
器１５にとり込んで。To measure antenna efficiency, first, a reference antenna is placed inside surrounded by the radio wave scatterer 11, and power is supplied to the oscillator to transmit radio waves. And this transmitted radio wave,
(by the rotating receiving antenna 14) and input into the field strength analyzer 15.
受信確率分布として分析し、受信確率分布グラフを作成
する。次に被測定アンテナを上記と同様に電波散乱体１
１でとり囲み、同様の測定を行い受信レベル対受信確率
分布のグラフを作成する。Analyze the reception probability distribution and create a reception probability distribution graph. Next, place the antenna to be measured on the radio wave scatterer 1 in the same way as above.
1 and perform similar measurements to create a graph of reception level versus reception probability distribution.
そして上記２つのグラフの同一確率の受信レベル差から
相対的ＫＷ測定アンテナのアンテナ効率を測定し得る。Then, the antenna efficiency of the relative KW measurement antenna can be measured from the reception level difference with the same probability in the above two graphs.
第７図は上記本発明の測定方法により得られた受信レベ
ル対受信確率分布を示す。なおこの特性は％屋内におい
て、受信アンテナを１．５ｍのアームの先端に取着して
送信アンテナから２０ｍ離して配置し、かつ受信アンテ
ナの偏波（アンテナの方向）を互いに直交する３つの方
向に可変し、各偏波方向において、合計６回アームとと
もに受信アンテナを回転式せてデータの取り込みを行っ
て得たものである。この測定条件は、送信アンテナを電
波散乱体１１内部に置いたことを除いて第４図の特性測
定の場合と同一である。FIG. 7 shows the reception level versus reception probability distribution obtained by the measuring method of the present invention. This characteristic is % indoors when the receiving antenna is attached to the tip of a 1.5m arm and placed 20m away from the transmitting antenna, and the polarization of the receiving antenna (direction of the antenna) is set in three directions orthogonal to each other. The data was obtained by rotating the receiving antenna together with the arm a total of six times in each polarization direction. The measurement conditions are the same as those for the characteristic measurement shown in FIG. 4, except that the transmitting antenna is placed inside the radio wave scatterer 11.
第７図において、・７１，７２．７３はそれぞれ受信ア
ンテナの偏波をＺ方向、Ｘ方向およびＸ方向に設定した
場合の特性である。この特性図から従来送信アンテナの
方向と偏波によるレベル差が６ｄＢあったものが、本発
明の方法、すなわち送信アンテナの囲り電波散乱体を配
置することにより、レベル差は３ｄＢ程度まで改善され
たことが分る。In FIG. 7, ·71, 72, and 73 are the characteristics when the polarization of the receiving antenna is set in the Z direction, the X direction, and the X direction, respectively. This characteristic diagram shows that conventionally there was a level difference of 6 dB depending on the direction and polarization of the transmitting antenna, but by using the method of the present invention, that is, placing a radio wave scatterer around the transmitting antenna, the level difference has been improved to about 3 dB. It turns out that
第２図に本発明の他の実施例を示す、同図においては受
信アンテナ系は第１図と一様でおるので省略している。FIG. 2 shows another embodiment of the present invention. In the same figure, the receiving antenna system is the same as that in FIG. 1, so it is omitted.
この実施例ｔは、内壁２３と外壁２４を有し、その間に
電波散乱体２７を入れた非金属の中ヤップ３０を用意し
、送信アンテナ２１と発振器２２をキオップ３０の内壁
が作る空間に配置し、さらにキャップ３０に設けられた
空気送風口２５全通して送に機２８から空気を送シ、電
波散乱体２７を移動させるようにしだものである。In this embodiment t, a non-metallic inner wall 30 having an inner wall 23 and an outer wall 24 and a radio wave scatterer 27 inserted therebetween is prepared, and a transmitting antenna 21 and an oscillator 22 are arranged in a space created by the inner wall of the keyop 30. Furthermore, air is sent from the air blower 28 through the entire air blowing port 25 provided in the cap 30 to move the radio wave scattering body 27.
このような方法を用いると送信アンテナから発射された
電波は、より効果的に散乱を受けるようになるため、上
記受イぎレベルの差をきらに少なくすることができる。When such a method is used, the radio waves emitted from the transmitting antenna are more effectively scattered, so that the difference in reception levels can be significantly reduced.
尚、上記実癩例において送信アンテナをとり囲む電波散
乱体は、多いほど特性上は好ましいが、発射される電波
強度との関係で適宜設計され碍る。In the above practical example, the more radio wave scatterers surrounding the transmitting antenna, the better in terms of characteristics, but they can be designed as appropriate in relation to the intensity of emitted radio waves.
また上記実施例では送信アンテナを固定し、受信アンテ
ナを回転するようにして測定したが、受信アンテナを固
定し、送信アンテナを回転するようにしてもよい。但し
、受信アンテナを回転する方が導電的に簡単であるので
好ましい。Further, in the above embodiment, the transmitting antenna was fixed and the receiving antenna was rotated for measurement, but the receiving antenna may be fixed and the transmitting antenna was rotated. However, it is preferable to rotate the receiving antenna because it is easier to conduct the antenna.
以上説明したように、本発明ＶＣよると、被測定アンテ
ナ及び基準アンテナの囲りに設けられた電波散乱体によ
り被測定アンテナ及び基準アンテすから発射された電波
は散乱を受けるために、被測定アンテナ及び基準アンテ
ナの設置方向を変化させても受信アンチナシ・こおける
受信レベルの差を少くすることができ、被測定アンテナ
の指向性やＡｎ特性によらず、ｆＲ度のよいアンテナ効
率の測定が行える。As explained above, according to the VC of the present invention, the radio waves emitted from the antenna under test and the reference antenna are scattered by the radio wave scatterers provided around the antenna under test and the reference antenna. Even if the installation direction of the antenna and the reference antenna is changed, the difference in reception levels between reception angles and angles can be reduced, and antenna efficiency with good fR can be measured regardless of the directivity or An characteristics of the antenna under test. I can do it.
また電波散乱体は金属板、金属薄など全７属体であれば
良く、材質にとられれないため、その構成は容易である
。更に電波散乱体によシミ波が散乱を受けるため、受信
確率分布がよシレーレ分布に近づき、その結果として測
定時間も短縮することができる。In addition, the radio wave scatterer can be made of any of seven metals, such as a metal plate or thin metal, and is not limited to any material, so its construction is easy. Furthermore, since the stain waves are scattered by radio wave scatterers, the reception probability distribution approaches the Schiller distribution, and as a result, the measurement time can also be shortened.
第１図は本発明の一実施例を示す図、第２図は本発明の
他の実施例を示す図、第３図はランダムフィールド法の
原理図、■４図は従来の測定方法による受信レベル対受
信確率分布図、第５図は従来の測定方法の問題点を説明
するための図、第６図はアンテナ指向性の一例を示す図
、第７図は本発明の方法による受信レベル対受信確率分
布図である。
１１・・・電波散乱体 １２・・・送信アンテナ１３
・・・発振器 １４・・・受信アンテナ１５・
・・電界強度分析器 工６・・・Ｎ、界憎度測定器１７
・・・マイクロコンピュータ１８・・・アーム１９・・
・モータ
代理人 弁理士 則 近 憲 右
同 竹 花 喜久男
第１１１
第 Ｚ 閃
′−文
Ｌ−−−−−−−Ｊ
第 ３ 図
集 ４ 図
７ノ万水平偏液方勺×
ｆ＋！六電奎ベニ
第 ７ 図
手 続 補 正 書（方式）
１、事件の表示
特願昭６１−１８６９０８号
２、発明の名称
アンテナ効率６１１ｊ定方法
３、補正をする者
事件との関係 特許出願人
（３０７）株式会社 東芝
４、代理人
〒１０５
東京都港区芝浦−丁目１３１号
昭、１１］６１年１０月２８日（発、２日）６、 補正
の対象
Ｏ明細書および図面
７、補正の内容Figure 1 is a diagram showing one embodiment of the present invention, Figure 2 is a diagram showing another embodiment of the present invention, Figure 3 is a diagram of the principle of the random field method, and Figure 4 is reception using a conventional measurement method. Figure 5 is a diagram for explaining the problems of the conventional measurement method, Figure 6 is a diagram showing an example of antenna directivity, and Figure 7 is a diagram showing the reception level versus reception probability distribution according to the method of the present invention. It is a reception probability distribution diagram. 11...Radio wave scatterer 12...Transmission antenna 13
...Oscillator 14...Receiving antenna 15.
...Electric field strength analyzer Engineering 6...N, Field intensity measuring device 17
...Microcomputer 18...Arm 19...
・Motor agent Patent attorney Nori Chika Ken Kikuo Takehana No. 111 No. Rokudenkyu Beni No. 7 Procedure Amendment (Method) 1. Indication of the case Patent Application No. 186908/1982 2. Name of the invention Antenna Efficiency 611j Determination Method 3. Person making the amendment Relationship with the case Patent applicant (307) Toshiba Corporation 4, Agent 11, 11, 131 Shibaura-chome, Minato-ku, Tokyo 105] October 28, 1961 (issued on 2nd) 6, Subject of amendment O Specification and drawings 7, Amendment contents of
Claims (3)
れ該アンテナから電波を送信し、これを前記アンテナに
対して相対的に所定の経路で移動する受信アンテナで受
信し、前記基準アンテナの特性との比較から前記被測定
アンテナのアンテナ効率を測定するアンテナ効率測定方
法において、前記基準アンテナ及び被測定アンテナの囲
りに電波散乱体を配置して上記測定を行うことを特徴と
するアンテナ効率測定方法。(1) Radio waves are transmitted from each of the reference antenna and the antenna to be measured, received by a receiving antenna that moves along a predetermined path relative to the antenna, and compared with the characteristics of the reference antenna. An antenna efficiency measuring method for measuring the antenna efficiency of the antenna to be measured, characterized in that the measurement is performed by arranging a radio wave scatterer around the reference antenna and the antenna to be measured.
アンテナを回転させて測定することを特徴とする特許請
求の範囲第１項記載のアンテナ効率測定方法。(2) The antenna efficiency measuring method according to claim 1, characterized in that the reference antenna and the antenna to be measured are fixed, and the receiving antenna is rotated for measurement.
まわりを移動せしめて測定を行うことを特徴とする特許
請求の範囲第１項記載のアンテナ効率測定方法。(3) The antenna efficiency measuring method according to claim 1, characterized in that the measurement is performed by moving a radio wave scatterer around the reference antenna and the antenna to be measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18690886A JPS6344180A (en) | 1986-08-11 | 1986-08-11 | Antenna efficiecty measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18690886A JPS6344180A (en) | 1986-08-11 | 1986-08-11 | Antenna efficiecty measurement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6344180A true JPS6344180A (en) | 1988-02-25 |
Family
ID=16196786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18690886A Pending JPS6344180A (en) | 1986-08-11 | 1986-08-11 | Antenna efficiecty measurement |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6344180A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4968983A (en) * | 1988-01-20 | 1990-11-06 | Kabushiki Kaisha Toshiba | Radiation field characteristic measuring apparatus |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5717869A (en) * | 1980-07-07 | 1982-01-29 | Toshiba Corp | Antenna efficiency measuring device |
| JPS58168970A (en) * | 1982-03-30 | 1983-10-05 | Toshiba Corp | Measuring method of antenna efficiency |
-
1986
- 1986-08-11 JP JP18690886A patent/JPS6344180A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5717869A (en) * | 1980-07-07 | 1982-01-29 | Toshiba Corp | Antenna efficiency measuring device |
| JPS58168970A (en) * | 1982-03-30 | 1983-10-05 | Toshiba Corp | Measuring method of antenna efficiency |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4968983A (en) * | 1988-01-20 | 1990-11-06 | Kabushiki Kaisha Toshiba | Radiation field characteristic measuring apparatus |
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