JPH0323683Y2 - - Google Patents
Info
- Publication number
- JPH0323683Y2 JPH0323683Y2 JP3496484U JP3496484U JPH0323683Y2 JP H0323683 Y2 JPH0323683 Y2 JP H0323683Y2 JP 3496484 U JP3496484 U JP 3496484U JP 3496484 U JP3496484 U JP 3496484U JP H0323683 Y2 JPH0323683 Y2 JP H0323683Y2
- Authority
- JP
- Japan
- Prior art keywords
- waveguide
- transmission
- oversized
- diameter
- tapered
- 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
- 230000005540 biological transmission Effects 0.000 claims description 56
- 238000010586 diagram Methods 0.000 description 4
- 230000005672 electromagnetic field Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Waveguide Connection Structure (AREA)
- Waveguide Switches, Polarizers, And Phase Shifters (AREA)
Description
【考案の詳細な説明】
(技術分野)
この考案は、マイクロ波帯やミリ波帯の電磁波
を伝送するためのオーバサイズ伝送導波管と基本
モード伝送導波管とを接続するために用いられる
導波管接続装置に関する。[Detailed description of the invention] (Technical field) This invention is used to connect an oversized transmission waveguide and a fundamental mode transmission waveguide for transmitting electromagnetic waves in the microwave band or millimeter wave band. The present invention relates to a waveguide connection device.
(従来技術)
マイクロ波帯やミリ波帯の電磁波の伝送におい
て損失を減少させるために、オーバサイズ伝送導
波管を用いることが良く行われる。このオーバサ
イズ伝送導波管と基本モード伝送導波管とを接続
する導波管接続装置では、不要電磁界モードの発
生やインピーダンス不整合を極力おさえる必要が
ある。そこで、従来のこの接続装置では、オーバ
サイズ伝送導波管と同じ口径から、口径をごく僅
かずつ変化させたテーパ導波管を用いて、不要電
磁界の発生やインピーダンス不整合を抑えてい
た。(Prior Art) In order to reduce loss in the transmission of electromagnetic waves in the microwave band or millimeter wave band, oversized transmission waveguides are often used. In a waveguide connecting device that connects this oversized transmission waveguide and a fundamental mode transmission waveguide, it is necessary to suppress the generation of unnecessary electromagnetic field modes and impedance mismatch as much as possible. Therefore, in this conventional connection device, a tapered waveguide whose diameter is slightly changed from the same diameter as the oversized transmission waveguide is used to suppress the generation of unnecessary electromagnetic fields and impedance mismatch.
しかし、この導波管接続装置では、テーパ導波
管は長くなり接続装置の小形化の障害となり、
又、テーパ導波管の製作が大変難しい欠点があつ
た。 However, in this waveguide connection device, the tapered waveguide becomes long, which becomes an obstacle to downsizing the connection device.
Another drawback was that manufacturing the tapered waveguide was very difficult.
又、小形化のために第1図に断面図で示す如
く、オーバサイズ伝送導波管1の口径から基本モ
ード伝送導波管3の口径へ短いテーパ導波管2で
変換した導波管接続装置では、インピーダンス不
整合や不要電磁界モードの発生で損失が大きく、
更に、多重モード反射により周波数特性が悪い欠
点があつた。 In addition, in order to reduce the size, as shown in the cross-sectional view in FIG. In equipment, losses are large due to impedance mismatch and generation of unnecessary electromagnetic field modes.
Furthermore, it had the disadvantage of poor frequency characteristics due to multimode reflection.
これを更に詳しく説明すると、第1図に示され
るオーバサイズ伝送導波管1には、例えば、文
献:マイクロ波およびミリ波回路(昭和39年2月
25日発行、丸善、38頁ないし42頁)に示されるよ
うに、基本伝送モードである円形TE11モードか
ら、電界が管軸方向にも存在する高次TMモード
および電界が管軸方向には存在しない高次TEモ
ード共に、テーパ導波管2から励振可能である。
このため、伝送損失の多い高次モードが励振され
る可能性も高く、オーバサイズ伝送導波管1とそ
の両端にテーパ導波管2が接続された場合には、
その接続部による共振現象とも相まつて、円形
TE11モード伝送において想定される伝送損失よ
りはるかに大きい損失を生じることがある。 To explain this in more detail, the oversized transmission waveguide 1 shown in FIG.
(published on the 25th, Maruzen, pp. 38-42), from the circular TE 11 mode, which is the basic transmission mode, to the higher-order TM mode in which the electric field also exists in the tube axis direction, and the electric field in the tube axis direction. Both high-order TE modes that do not exist can be excited from the tapered waveguide 2.
Therefore, there is a high possibility that higher-order modes with large transmission losses will be excited, and when the oversized transmission waveguide 1 and the tapered waveguide 2 are connected to both ends of the oversized transmission waveguide 1,
Coupled with the resonance phenomenon caused by the connection, the circular
In TE 11 mode transmission, the transmission loss may be much larger than expected.
一例として、オーバサイズ導波管1(口径φ70
mm長さ4m)の両端にテーパ導波管2(口径φ70
mmからφ1.7mmへのテーパ、長さ90mm)をそれぞれ
接続し、その両端の基本モード導波管3(口径
φ1.7mm)から電磁波を伝送したときの損失特性を
第2図に示す。この第2図から判るように、第1
図の方式には、損失が多く(約15dB〜20dB)、
周波数特性にリツプルを生ずるという欠点があつ
た。 As an example, oversize waveguide 1 (diameter φ70
Tapered waveguide 2 (diameter φ70) at both ends of mm length 4m)
Fig. 2 shows the loss characteristics when electromagnetic waves are transmitted from the fundamental mode waveguides 3 (diameter 1.7 mm) at both ends of the waveguides (tapered from mm to 1.7 mm, length 90 mm). As you can see from this Figure 2, the first
The method shown in the figure has a lot of loss (approximately 15dB to 20dB),
The drawback was that it caused ripples in the frequency characteristics.
(考案の目的)
本考案の目的は、伝送損失が小さく、周波数特
性が良好で、しかも長さが短い導波管接続装置の
提供にある。(Purpose of the invention) An object of the invention is to provide a waveguide connecting device with low transmission loss, good frequency characteristics, and short length.
(考案の構成)
本考案の導波管接続装置は、円形のオーバサイ
ズ伝送導波管と基本モード伝送導波管とを円形の
テーパ導波管で接続する導波管接続装置におい
て、前記オーバサイズ伝送導波管と前記テーパ導
波管とを電磁的に接続し、前記オーバサイズ伝送
導波管に対面する側の前記テーパ導波管の口径を
前記オーバサイズ伝送導波管の口径より小さく且
つその口径の1/5より大きくしている。(Structure of the invention) The waveguide connecting device of the present invention connects a circular oversized transmission waveguide and a fundamental mode transmission waveguide with a circular tapered waveguide. A size transmission waveguide and the tapered waveguide are electromagnetically connected, and the diameter of the tapered waveguide on the side facing the oversized transmission waveguide is smaller than the diameter of the oversized transmission waveguide. Moreover, it is larger than 1/5 of its diameter.
(実施例) 次に実施例を挙げ本考案を詳細に説明する。(Example) Next, the present invention will be explained in detail with reference to Examples.
第3図は本考案の一実施例を示す断面図であ
る。この実施例では、テーパ導波管4は、オーバ
サイズ伝送導波管1の片端側におけるオーバサイ
ズ伝送導波管1の口径φ1より小さい口径φ2から
基本モード伝送導波管3の口径φ3へ変換する。 FIG. 3 is a sectional view showing an embodiment of the present invention. In this embodiment, the tapered waveguide 4 has an aperture φ 2 smaller than the aperture φ 1 of the oversized transmission waveguide 1 at one end of the oversized transmission waveguide 1 to an aperture φ of the fundamental mode transmission waveguide 3 . Convert to 3 .
この実施例において、例えば、オーバサイズ伝
送導波管1(口径φ170mm、長さ4m)の両端にテ
ーパ導波管4(口径φ220mmからφ31.7mmへのテー
パ長さ90mm)を、両者の開口面および中心を一致
させて機械的には分離するが電磁的には接続し、
その一端の基本モード伝送導波管3(口径φ31.7
mm)から電磁波を伝送した場合、第4図に特性図
で示す損失特性(損失約7〜8dB)が得られた。
従つて、第1図の従来の導波管接続装置による損
失特性(第2図)と本実施例による損失特性(第
4図)とを比較すると、本実施例の伝送損失の方
がはるかに低く、しかも、周波数特性が良好(リ
ツプルが小)であることが判る。 In this embodiment, for example, a tapered waveguide 4 (tapered length 90 mm from diameter φ 2 20 mm to φ 3 1.7 mm) is installed at both ends of an oversized transmission waveguide 1 (diameter φ 1 70 mm, length 4 m). , by aligning the aperture surfaces and centers of both to separate them mechanically but connect them electromagnetically,
Fundamental mode transmission waveguide 3 at one end (diameter φ 3 1.7
When electromagnetic waves were transmitted from 1.5 mm), the loss characteristics (loss approximately 7 to 8 dB) shown in the characteristic diagram in Figure 4 were obtained.
Therefore, when comparing the loss characteristics of the conventional waveguide connection device shown in Fig. 1 (Fig. 2) and the loss characteristics of this embodiment (Fig. 4), the transmission loss of this embodiment is much higher. It can be seen that the frequency characteristics are low and the frequency characteristics are good (small ripple).
このように第4図に示す本実施例による伝送損
失が、第2図に示す従来例による伝送損失より小
さくなる理由について考察する。本実施例による
オーバサイズ伝送導波管1とテーパ導波管4との
間は、それぞれの導体が機械的に分離されてい
る。従つて、テーパ導波管4からオーバサイズ伝
送導波管1へは、周知のように、少なくとも壁面
電流が管軸方向に流れる高次モード、例えばTM
モードは励振され難い。そして、多重モード反射
による共振現象は軽減される。本実施例におい
て、テーパ導波管4とオーバサイズ伝送導波管1
は、136GHz帯においては両者ともオーバサイズ
導波管となつているため、その固有インピーダン
スは自由空間とほぼ近い値となつている。その結
果、両者の口径が多少違つていても電気的な不連
続が少なく、テーパ導波管4からオーバサイズ伝
送導波管1への励振、あるいはその逆方向励振
は、基本モードである円形TE11モードが主とな
ると考えられる。但し、テーパ導波管4の口径が
オーバサイズ伝送導波管1の口径より小さすぎる
ときには、両者間に十分なエネルギ(電力)の授
受が行われない恐れがあると考えられる。ここ
で、円形TE11モードにおけるオーバサイズ伝送
導波管1の開口面の電力分布は、文献の40頁およ
び41頁の式(1.194)を用いて計算することがで
きる。第5図に円形TE11モード伝送における円
形導波管(ここではオーバサイズ伝送導波管1)
の開口面の電力分布の計算結果を示す。円形導波
管の口径に対する開口面の比(開口比)が0.29の
とき、その開口面に占める電力量は、約0.21(−
6.8dB)と計算される。また、電力量が1/10
(10dB)となる開口比は1/5程度である。第4
図に示す実験例(伝送損失7〜8dB)において、
オーバサイズ伝送導波管1の伝送損失は1dB以
下、かつ図中の左側に位置するテーパ導波管4か
らオーバサイズ伝送導波管1への結合損失は無視
できる程度と推定されるので、オーバサイズ伝送
導波管1からテーパ導波管4への結合損失は7dB
程度と推定される。従つて、この円形TE11モー
ド伝送の開口面電力分布から計算した結果と実験
値はよく一致している。尚、定量的ではないが、
円形TE11モード伝送において、エネルギ(電力)
が導波管の中央部に集中している様子が、文献の
410頁、図14.27にも示されている。 The reason why the transmission loss according to this embodiment shown in FIG. 4 is smaller than the transmission loss according to the conventional example shown in FIG. 2 will be considered. The conductors between the oversized transmission waveguide 1 and the tapered waveguide 4 according to this embodiment are mechanically separated. Therefore, as is well known, from the tapered waveguide 4 to the oversized transmission waveguide 1, at least a higher-order mode in which the wall current flows in the tube axis direction, such as TM
modes are difficult to excite. Then, the resonance phenomenon caused by multimode reflection is reduced. In this embodiment, a tapered waveguide 4 and an oversized transmission waveguide 1 are used.
In the 136 GHz band, both are oversized waveguides, so their characteristic impedances are almost the same as in free space. As a result, even if the apertures of the two are slightly different, there is little electrical discontinuity, and the excitation from the tapered waveguide 4 to the oversized transmission waveguide 1, or the excitation in the opposite direction, is circular, which is the fundamental mode. It is thought that TE 11 mode will be the main mode. However, if the diameter of the tapered waveguide 4 is too smaller than the diameter of the oversized transmission waveguide 1, there is a possibility that sufficient energy (power) may not be transferred between the two. Here, the power distribution of the aperture surface of the oversized transmission waveguide 1 in the circular TE 11 mode can be calculated using equation (1.194) on pages 40 and 41 of the document. Figure 5 shows a circular waveguide in circular TE 11 mode transmission (here, oversized transmission waveguide 1).
The calculation results of the power distribution on the aperture surface are shown. When the ratio of the aperture to the diameter of a circular waveguide (aperture ratio) is 0.29, the amount of power occupied by the aperture is approximately 0.21 (-
6.8dB). Also, the amount of electricity is 1/10
The aperture ratio of (10 dB) is about 1/5. Fourth
In the experimental example shown in the figure (transmission loss 7 to 8 dB),
The transmission loss of the oversized transmission waveguide 1 is estimated to be 1 dB or less, and the coupling loss from the tapered waveguide 4 located on the left side of the figure to the oversized transmission waveguide 1 is estimated to be negligible. Coupling loss from size transmission waveguide 1 to tapered waveguide 4 is 7dB
It is estimated that the Therefore, the results calculated from the aperture power distribution of circular TE 11 mode transmission and the experimental values are in good agreement. Although not quantitative,
In circular TE 11 mode transmission, energy (power)
The literature shows that
Also shown on page 410, Figure 14.27.
以上の如く、この実施例は、オーバサイズ伝送
導波管1の片端においてオーバサイズ伝送導波管
1の口径φ1よりも小さい口径φ2から、基本モー
ド伝送導波管3の口径φ3へ変換するテーパ導波
管4よりなる構造の小形の装置であり、オーバサ
イズ伝送導波管1と基本モード伝送導波管3とを
低損失でかつ良好な周波数特性で接続することが
できる。 As described above, in this embodiment, at one end of the oversized transmission waveguide 1, the diameter φ 2 is smaller than the diameter φ 1 of the oversized transmission waveguide 1, and the diameter φ 3 of the fundamental mode transmission waveguide 3 is changed. It is a small device having a structure consisting of a tapered waveguide 4 for conversion, and can connect the oversized transmission waveguide 1 and the fundamental mode transmission waveguide 3 with low loss and good frequency characteristics.
(考案の効果)
前に詳しく述べたように、本考案によれば、長
さが短かい場合にも、比較的、伝送損失が少な
く、周波数特性が良好な導波管接続装置が提供で
きる。(Effects of the Invention) As described in detail above, according to the present invention, it is possible to provide a waveguide connecting device with relatively little transmission loss and good frequency characteristics even when the length is short.
第1図は従来の導波管接続装置を概念的に示す
断面図、第2図はこの従来装置の特性を示す図、
第3図は本考案の一実施例を概念的に示す断面
図、第4図はこの実施例の特性を示す図、第5図
は円形導波管の開口面の電力分布を示す図であ
る。
1……オーバサイズ伝送導波管、2,4……テ
ーパ導波管、3……基本モード伝送導波管。
FIG. 1 is a cross-sectional view conceptually showing a conventional waveguide connection device, and FIG. 2 is a diagram showing the characteristics of this conventional device.
FIG. 3 is a cross-sectional view conceptually showing an embodiment of the present invention, FIG. 4 is a diagram showing the characteristics of this embodiment, and FIG. 5 is a diagram showing the power distribution on the aperture surface of a circular waveguide. . 1... Oversized transmission waveguide, 2, 4... Tapered waveguide, 3... Fundamental mode transmission waveguide.
Claims (1)
送導波管とを円形のテーパ導波管で接続する導波
管接続装置において、前記オーバサイズ伝送導波
管と前記テーパ導波管とを電磁的に接続し、前記
オーバサイズ伝送導波管に対面する側の前記テー
パ導波管の口径を前記オーバサイズ伝送導波管の
口径より小さく且つその口径の1/5より大きくし
たことを特徴とする導波管接続装置。 In a waveguide connection device that connects a circular oversized transmission waveguide and a fundamental mode transmission waveguide with a circular tapered waveguide, the oversized transmission waveguide and the tapered waveguide are electromagnetically connected. and the diameter of the tapered waveguide on the side facing the oversized transmission waveguide is smaller than the diameter of the oversized transmission waveguide and larger than 1/5 of that diameter. Waveguide connection device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3496484U JPS60149206U (en) | 1984-03-12 | 1984-03-12 | Waveguide connection device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3496484U JPS60149206U (en) | 1984-03-12 | 1984-03-12 | Waveguide connection device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS60149206U JPS60149206U (en) | 1985-10-03 |
JPH0323683Y2 true JPH0323683Y2 (en) | 1991-05-23 |
Family
ID=30538818
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3496484U Granted JPS60149206U (en) | 1984-03-12 | 1984-03-12 | Waveguide connection device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS60149206U (en) |
-
1984
- 1984-03-12 JP JP3496484U patent/JPS60149206U/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS60149206U (en) | 1985-10-03 |
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