JPH054713Y2 - - Google Patents
Info
- Publication number
- JPH054713Y2 JPH054713Y2 JP1986177454U JP17745486U JPH054713Y2 JP H054713 Y2 JPH054713 Y2 JP H054713Y2 JP 1986177454 U JP1986177454 U JP 1986177454U JP 17745486 U JP17745486 U JP 17745486U JP H054713 Y2 JPH054713 Y2 JP H054713Y2
- Authority
- JP
- Japan
- Prior art keywords
- circular
- waveguide
- inner diameter
- wave
- diameter
- 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 - Lifetime
Links
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- Constitution Of High-Frequency Heating (AREA)
- Waveguides (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は、マイクロ波加熱用に好適なフレキシ
ブル円形導波管に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a flexible circular waveguide suitable for microwave heating.
マイクロ波加熱装置へのマイクロ波伝送用とし
て、従来では固定された方形導波管を使用してい
た。しかしながら、この固定導波管は、伝送方向
の変更が導波管の組替えを伴うので、その方向変
換が困難であり、特に伝送方向を曲げるためにコ
ーナ導波管を必要とするので、迂回する必要があ
り設置スペースを多く要する。また、フランジ面
の微調整、つまり芯合わせが非常に困難であると
いう問題もあつた。
Conventionally, fixed rectangular waveguides have been used for microwave transmission to microwave heating devices. However, this fixed waveguide is difficult to change the direction of transmission because changing the transmission direction involves rearranging the waveguide, and especially requires a corner waveguide to bend the transmission direction, so it is difficult to change the direction of the transmission. It requires a lot of installation space. Another problem was that fine adjustment of the flange surface, that is, centering, was extremely difficult.
本考案の目的は、伝送方向を自由に変えること
ができ、しかも損失を最小限にくい止めることが
できるようにしたフレキシブル円形導波管を提供
することである。
An object of the present invention is to provide a flexible circular waveguide that can freely change the transmission direction and minimize loss.
このため本考案のフレキシブル円形導波管は、
円形径小部と円形径大部を軸方向に交互に設けた
蛇腹形状で成り、マイクロ波の遮断波長をλcと
したとき、上記円形径小部の内径ａと、上記円形
径大部の内径ｂとを、
λc／1.706≦ａ≦λc／1.307
ｂ＜λc／1.028
に設定したものである。
Therefore, the flexible circular waveguide of this invention is
It has a bellows shape with small circular diameter parts and large circular diameter parts arranged alternately in the axial direction, and when the microwave cutoff wavelength is λc, the inner diameter a of the small circular diameter part and the inner diameter of the large circular diameter part are b is set to λc/1.706≦a≦λc/1.307 b<λc/1.028.
以下、本考案の実施例について説明する。第１
図はその一実施例のフレキシブル円形導波管１の
一部を示す図である。この導波管１は螺旋形状で
はなく、円形径小部１ａと円形径大部１ｂを軸方
向に交互に設けた蛇腹形状で成り、円形径小部１
ａの内径寸法はａ、円形径大部１ｂの内径寸法は
ｂである。
Examples of the present invention will be described below. 1st
The figure shows a part of a flexible circular waveguide 1 according to one embodiment. This waveguide 1 does not have a spiral shape, but has a bellows shape in which circular small diameter portions 1a and circular large diameter portions 1b are alternately provided in the axial direction.
The inner diameter of a is a, and the inner diameter of the large circular diameter portion 1b is b.
マイクロ波の円形伝送線路として最も安定した
線路は、基本波のTE11波だけを伝送できる線路
である。よつて、本実施例の導波管１としては、
円形径小部１ａの内径寸法ａをTE11波だけが伝
送できる寸法とする。 The most stable circular microwave transmission line is one that can transmit only the fundamental TE 11 wave. Therefore, as the waveguide 1 of this embodiment,
The inner diameter dimension a of the circular small diameter portion 1a is set to a dimension that allows only the TE 11 wave to be transmitted.
一方、円形径大部１ｂの内径寸法ｂについて
は、上記内径寸法ａと同様基本波であるTE11波
だけを伝送できる寸法にするならば、最も安定に
伝送できる。しかし、フレキシビリテイをもたせ
るために内径寸法ｂは内径寸法ａよりも大きくす
る必要がある（ａ＜ｂ）。 On the other hand, if the inner diameter dimension b of the circular large-diameter portion 1b is set to a dimension capable of transmitting only the TE 11 wave, which is the fundamental wave, like the inner diameter dimension a described above, the most stable transmission can be achieved. However, in order to provide flexibility, the inner diameter dimension b needs to be larger than the inner diameter dimension a (a<b).
よつて、本実施例では、この円形径大部１ｂの
内径寸法ｂを、TE11波及びTM01波の２波が伝送
でき、TE21波は伝送できない寸法にする。 Therefore, in this embodiment, the inner diameter dimension b of the circular large diameter portion 1b is set to a dimension that allows two waves, the TE 11 wave and the TM 01 wave, to be transmitted, but not the TE 21 wave.
TM01波が発生するのは曲げた部分の円形径大
部１ｂであり、ストレート部分では発生しない。
そして、曲げた円形径大部１ｂで発生したTM01
波はすぐ隣にある円形径小部１ａで減衰してしま
う。つまり、内径寸法ａの円形径小部１ａでは
TM01波は伝送できない。よつて、TM01波が発
生しても曲げることですぐ打ち消されてしまうの
で、あまり大きな損失を伴わずにマイクロ波を伝
送することができる。 The TM 01 wave is generated in the circular large diameter portion 1b of the bent portion, and is not generated in the straight portion.
Then, TM 01 occurred in the bent circular large diameter portion 1b.
The waves are attenuated by the immediately adjacent circular small-diameter portion 1a. In other words, in the circular small diameter portion 1a with the inner diameter dimension a,
TM 01 waves cannot be transmitted. Therefore, even if a TM 01 wave is generated, it is immediately canceled by bending, so microwaves can be transmitted without causing too much loss.
例えば、内径寸法ａ＝78mm、内径寸法ｂ＝101
mm、長さｌ＝１，000mmで、搬送マイクロ波周波
数＝２，450MHz、伝送電力5kwとした場合、
この導波管の挿入損失は20％であつた。 For example, inner diameter dimension a = 78 mm, inner diameter dimension b = 101
mm, length l = 1,000 mm, carrier microwave frequency = 2,450 MHz, and transmission power 5 kW,
The insertion loss of this waveguide was 20%.
また、上記と同様の条件で内径寸法ｂ＝130mm、
とした場合には、導波管の挿入損失は50〜60％で
あつた。このように、周波数＝２，450MHzで
内径寸法ｂ＝130mmとすれば、２次以上（例えば
TE21波）のモードがのり、挿入損失が大幅に増
加することが判る。 Also, under the same conditions as above, the inner diameter b = 130 mm,
In this case, the insertion loss of the waveguide was 50 to 60%. In this way, if the frequency = 2,450MHz and the inner diameter dimension b = 130mm, then the second or higher order (for example
It can be seen that the insertion loss increases significantly as the TE 21 wave) mode increases.
ここで、この周波数＝２，450MHzを伝送す
る場合には、
TE11波の遮断径 R1＝λc／1.706
＝71.78mm
TE21波の遮断径 R2＝λc／1.028
＝119.1mm
TM01波の遮断径 R3＝λc／1.307
＝93.7mm
であり、よつて内径寸法ａ，ｂ（mm）は、
71.78≦ａ≦93.7
ｂ≦119.1
に設定する必要がある。 Here, when transmitting this frequency = 2,450MHz, the cutoff diameter of TE 11 wave R 1 = λc / 1.706 = 71.78mm The cutoff diameter of TE 21 wave R 2 = λc / 1.028 = 119.1mm of TM 01 wave The cutoff diameter R 3 =λc/1.307 = 93.7mm, and therefore the inner diameter dimensions a and b (mm) must be set to 71.78≦a≦93.7 b≦119.1.
第２図はこのようにして搬送マイクロ波周波数
に応じた内径寸法ａ，ｂを設定したフレキシブル
円形導波管１を接続した例を示す図である。２は
方形導波管、３は円形／方形の導波管変換器であ
る。 FIG. 2 is a diagram showing an example in which flexible circular waveguides 1 having inner diameter dimensions a and b set in accordance with the carrier microwave frequency are connected in this manner. 2 is a rectangular waveguide, and 3 is a circular/square waveguide converter.
このように、フレキシブル円形導波管を使用す
ることができることにより、導波管の入口、出口
が固定されている場合、例えばグローブボツクス
（放射線封じ込め箱）貫通部とグローブボツクス
内アプリケータを接続する場合、フランジ面の微
調整ができ、その設置が容易となる。また、伝送
方向を自由に変更できるので、例えば移動しなが
らマイクロ波を照射することができる。更に、コ
ーナー導波管を使用する必要がなくなるので、導
波管を曲げ短距離で伝送路を接続することができ
るようになる。 In this way, by being able to use a flexible circular waveguide, when the inlet and outlet of the waveguide are fixed, for example, the penetration part of a glove box (radiation containment box) and the applicator in the glove box can be connected. In this case, the flange surface can be finely adjusted, making installation easier. Furthermore, since the transmission direction can be changed freely, it is possible to irradiate microwaves while moving, for example. Furthermore, since there is no need to use corner waveguides, it becomes possible to bend the waveguides and connect transmission lines over short distances.
以上から本考案によれば、フレキシビリテイが
あり、しかもマイクロ波損失の少ない導波管を実
現することができるようになる。
As described above, according to the present invention, it is possible to realize a waveguide that has flexibility and has low microwave loss.
第１図は本考案の一実施例のフレキシブル円形
導波管の部分断面図、第２図は通常の導波管に接
続した同円形導波管を示す図である。
１……フレキシブル円形導波管、２……方形導
波管、３……方形／円形の導波管変換器。
FIG. 1 is a partial sectional view of a flexible circular waveguide according to an embodiment of the present invention, and FIG. 2 is a diagram showing the same circular waveguide connected to an ordinary waveguide. 1... Flexible circular waveguide, 2... Rectangular waveguide, 3... Square/circular waveguide converter.
Claims (1)
た蛇腹形状で成り、マイクロ波の遮断波長をλc
としたとき、上記円形径小部の内径ａと、上記円
形径大部の内径ｂとを、 λc／1.706≦ａ≦λc／1.307 ｂ＜λc／1.028 に設定したことを特徴とするフレキシブル円形導
波管。[Claim for Utility Model Registration] It has a bellows shape with small circular diameter parts and large circular diameter parts arranged alternately in the axial direction, and has a microwave cutoff wavelength of λc.
The flexible circular conductor is characterized in that the inner diameter a of the small circular diameter portion and the inner diameter b of the large circular diameter portion are set to λc/1.706≦a≦λc/1.307 b<λc/1.028. Wave tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986177454U JPH054713Y2 (en) | 1986-11-20 | 1986-11-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986177454U JPH054713Y2 (en) | 1986-11-20 | 1986-11-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6383793U JPS6383793U (en) | 1988-06-01 |
| JPH054713Y2 true JPH054713Y2 (en) | 1993-02-05 |
Family
ID=31118668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986177454U Expired - Lifetime JPH054713Y2 (en) | 1986-11-20 | 1986-11-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH054713Y2 (en) |
-
1986
- 1986-11-20 JP JP1986177454U patent/JPH054713Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6383793U (en) | 1988-06-01 |
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