JPH0228595Y2 - - Google Patents
Info
- Publication number
- JPH0228595Y2 JPH0228595Y2 JP1983173533U JP17353383U JPH0228595Y2 JP H0228595 Y2 JPH0228595 Y2 JP H0228595Y2 JP 1983173533 U JP1983173533 U JP 1983173533U JP 17353383 U JP17353383 U JP 17353383U JP H0228595 Y2 JPH0228595 Y2 JP H0228595Y2
- Authority
- JP
- Japan
- Prior art keywords
- inner conductor
- conductor
- helical
- hermetically
- rod
- 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
- 239000004020 conductor Substances 0.000 claims description 78
- 239000000919 ceramic Substances 0.000 claims description 17
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 238000005219 brazing Methods 0.000 description 6
- 229910000833 kovar Inorganic materials 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 3
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- 239000011733 molybdenum Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Landscapes
- Microwave Tubes (AREA)
Description
【考案の詳細な説明】
［考案の技術分野］
この考案はヘリツクス型進行波管に係り、特に
その入力、又は出力結合器として用いられる同軸
気密端子部の改良に関する。
［考案の技術的背景とその問題点］
一般にヘリツクス型進行波管は、電子を発生す
る電子銃部と、信号を増幅する高周波作用部と、
電子ビームを捕捉するコレクタ部とを備えてい
る。そして、高周波作用部は、パイプ状真空容器
内にヘリツクス導体が３本の誘電体支持棒に支持
固定されてなる。この高周波作用部の両端には、
それぞれ入力用同軸気密端子部、及び出力用同軸
気密端子部が管軸に直交する方向に突設され、そ
れぞれ入力、出力結合器として用いられる。
この種の同軸気密端子部は、従来、第１図に示
すように構成され、進行波管の真空容器１７に、
径大部１２及び径小部１５からなるコバール（商
品名）のように鉄・ニツケル合金製の外導体１０
が管軸に直交する方向に突設されている。そし
て、外導体径大部１２内には、アルミナ
（Al2O3）などからなるセラミツク円板１３が鑞
付け部２０により気密接合されている。
外導体１０の内側には、軸心に沿つてコバール
製又はモリブデン製の棒状内導体１１が配設さ
れ、セラミツク円板１３を貫通して気密接合さ
れ、一端は真空容器１７内のヘリツクス導体１８
に接続され、他端は外部に露出している。
尚、図中の１４はコバール製の補助ワツシヤで
あり、１６はインピーダンス変換のためのステツ
プである。又、気密接合は、セラミツク円板１３
の中心孔、補助ワツシヤ１４部分で内導体１１と
鑞付け部１９で接合されている。
ところが、上記のような従来の同軸気密端子部
においては、鑞付け部１９を完全にするための補
助ワツシヤ１４を使用しているので、低周波帯で
は余り問題にならない高周波反射が高周波帯では
顕著になり、VSWR特性が劣化する。このこと
は又、帯域特性が狭いという欠点となる。
更に、進行波管の動作に際して、内導体１１の
温度上昇及び温度サイクルのため、内導体１１と
セラミツク円板１３との鑞接部に歪みが集中し、
破損し易く、信頼性に欠ける。
なお、別の従来例として実公昭37−24670号公
報に記載された「ループ結合装置」がある。この
従来例では、セラミツク円板を貫通して筒状内導
体を気密接合し、この筒状内導体の内部に更に棒
状ループを真空容器の内側から外側へ貫通したも
のである。しかし、この例では、棒状ループもセ
ラミツク円板を貫通しているため、動作時の熱膨
張による応力が直接セラミツク円板の気密接合部
に及ぶので、破損を生じ易い。
［考案の目的］
この考案の目的は、上記問題点を解決し、信頼
性及び高周波特性の優れたヘリツクス型進行波管
を提供することである。
［考案の概要］
この考案は、同軸気密端子部の内導体がヘリツ
クス導体に接続された径小な内導体棒状部と、こ
の内導体棒状部の先端部に気密接合された径大な
内導体筒状部とを有し、これらの気密接合部より
も外方の位置で内導体筒状部がセラミツク円板に
気密鑞接され、且つこれら外径が異なる内導体棒
状部と内導体筒状部との接続段差が外導体径小部
の内側に位置してインピーダンス変換用ステツプ
を兼ねているヘリツクス型進行波管である。
（実施例）
以下、図面を参照して、この考案の一実施例を
詳細に説明する。
この考案によるヘリツクス型進行波管の同軸気
密端子部は、第２図に示すように構成され、従来
例（第１図）と同一箇所には同一符号を付すこと
にする。
即ち、ヘリツクス型進行波管のパイプ状真空容
器（図示せず）には、管軸に直交する方向に外導
体１０が気密に突設されている。この外導体１０
は円筒状にして、表面に銅メツキを施したコバー
ルのような鉄・ニツケル合金製の外導体径大部１
２と、少なくとも内面に銅メツキを施した外径
2.7mmのステンレス製の外導体径小部１５からな
つている。
そして、上部の外導体径大部１２内には、第３
図に示すような厚さ1.2mmの中央孔１３ａを有し、
この内周面及び外周面にニツケルメツキが施され
たセラミツク円板１３が、鑞付け部２０により気
密接合されている。
このような外導体１０の軸心に沿つて内導体２
６が配設され、セラミツク円板１３を貫通してい
る。この場合、内導体２６は従来とは異なり、コ
バールのような鉄・ニツケル合金製の内導体筒状
部２１と、モリブデンのような高融点金属製の内
導体棒状部２２とからなり、これらの外面には銅
メツキが施され、高周波抵抗を低減している。内
導体棒状部２２は、図示しないヘリツクスに接続
されている。
そして、内導体筒状部２１はセラミツク円板１
３の中央孔１３ａに、７２Ag−２８Cu鑞のよう
な鑞材により、鑞付け部２３で気密接合されてい
る。そして内導体棒状部２２は、気密接合箇所２
３から離れた位置にそ先端２２ａが来るように内
導体筒状部２１内に挿入され、この筒状部２１と
棒状部２２とが鑞付け部２４により接続固定され
ている。内導体筒状部２１の外径寸法は、その内
側に挿入される内導体棒状部２２の外径寸法より
も大きく、両者の接続段差２７が外導体径小部１
５の内側所定位置に位置しており、本来必要とさ
れる同軸線路のインピーダンス変換用ステツプを
兼ねている。
なお、内導体筒状部２１の外部に露出した先端
開口部を塞ぐように、モリブデン製の栓２５が挿
入されれ、鑞付けにより固定されている。
［考案の効果］
この考案によれば、セラミツク円板１３と内導
体２６との気密接合箇所が、内導体筒状部２１で
鑞付けされているため、進行波管の動作でヘリツ
クス導体に結合された内導体棒状部２２が高温に
なつたり、或いは温度サイクルがあつても、その
歪みをこの内導体筒状部２１が吸収するので破損
の恐れが少ない。したがつて、気密鑞接の信頼性
が高い。又、内導体２６に不所望な突出部が生じ
ないため、VSWR特性が優れ、広帯域特性が得
られる。しかも内導体筒状部と内導体棒状部との
接続段差が、インピーダンス変換用ステツプご兼
ねているので、従来構造のようにわざわざ内導体
の径を異ならせてステツプを形成する必要がな
く、製作が容易である。 [Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a helical traveling wave tube, and particularly to improvements in a coaxial hermetic terminal portion used as an input or output coupler. [Technical background of the invention and its problems] In general, a helical traveling wave tube consists of an electron gun section that generates electrons, a high frequency action section that amplifies the signal,
and a collector section that captures the electron beam. The high-frequency acting section includes a helical conductor supported and fixed by three dielectric support rods within a pipe-shaped vacuum container. At both ends of this high frequency acting part,
An input coaxial airtight terminal portion and an output coaxial airtight terminal portion are provided to protrude in a direction perpendicular to the tube axis, and are used as input and output couplers, respectively. This type of coaxial airtight terminal has conventionally been constructed as shown in FIG.
An outer conductor 10 made of iron/nickel alloy such as Kovar (trade name), which consists of a large diameter part 12 and a small diameter part 15.
is provided protruding in a direction perpendicular to the tube axis. Inside the large diameter portion 12 of the outer conductor, a ceramic disc 13 made of alumina (Al 2 O 3 ) or the like is hermetically bonded by a brazed portion 20 . Inside the outer conductor 10, a rod-shaped inner conductor 11 made of Kovar or molybdenum is disposed along the axis, and is hermetically sealed through the ceramic disk 13, with one end connected to the helical conductor 18 in the vacuum vessel 17.
The other end is exposed to the outside. In the figure, 14 is an auxiliary washer made of Kovar, and 16 is a step for impedance conversion. In addition, the airtight joint is achieved using the ceramic disc 13.
The inner conductor 11 is joined to the inner conductor 11 at the center hole of the auxiliary washer 14 by a brazing portion 19. However, in the conventional coaxial hermetic terminal section as described above, since the auxiliary washer 14 is used to complete the brazed portion 19, high frequency reflection, which is not a problem in the low frequency band, becomes noticeable in the high frequency band. , and the VSWR characteristics deteriorate. This also results in the disadvantage of narrow band characteristics. Furthermore, during operation of the traveling wave tube, due to the temperature rise and temperature cycle of the inner conductor 11, strain concentrates on the soldered joint between the inner conductor 11 and the ceramic disc 13.
Easily damaged and unreliable. Note that another conventional example is a "loop coupling device" described in Japanese Utility Model Publication No. 37-24670. In this conventional example, a cylindrical inner conductor is hermetically sealed by passing through a ceramic disc, and a rod-shaped loop is further penetrated inside the cylindrical inner conductor from the inside to the outside of the vacuum vessel. However, in this example, since the rod-like loop also passes through the ceramic disc, the stress due to thermal expansion during operation is directly applied to the airtight joint of the ceramic disc, which is likely to cause damage. [Purpose of the invention] The purpose of the invention is to solve the above problems and provide a helical traveling wave tube with excellent reliability and high frequency characteristics. [Summary of the invention] This invention consists of a small-diameter inner conductor rod-shaped part in which the inner conductor of the coaxial hermetic terminal part is connected to a helical conductor, and a large-diameter inner conductor that is hermetically sealed to the tip of this inner conductor rod-shaped part. The inner conductor rod-shaped portion and the inner conductor cylindrical portion have different outer diameters, and the inner conductor cylindrical portion is hermetically soldered to the ceramic disc at a position outward from these airtight joints, and the inner conductor rod-shaped portion and the inner conductor cylindrical portion have different outer diameters. This is a helical traveling wave tube in which the connecting step with the small diameter portion of the outer conductor is located inside the small diameter portion of the outer conductor and also serves as a step for impedance conversion. (Example) Hereinafter, an example of this invention will be described in detail with reference to the drawings. The coaxial airtight terminal portion of the helix-type traveling wave tube according to this invention is constructed as shown in FIG. 2, and the same parts as in the conventional example (FIG. 1) are given the same reference numerals. That is, an outer conductor 10 is airtightly protruded from a pipe-shaped vacuum vessel (not shown) of the helical traveling wave tube in a direction perpendicular to the tube axis. This outer conductor 10
is a cylindrical outer conductor made of an iron-nickel alloy such as Kovar with a copper-plated surface.
2 and an outer diameter with copper plating on at least the inner surface.
It consists of a small diameter outer conductor portion 15 made of stainless steel with a diameter of 2.7 mm. In the upper outer conductor large diameter portion 12, a third
It has a central hole 13a with a thickness of 1.2 mm as shown in the figure,
The ceramic disc 13 whose inner and outer peripheral surfaces are plated with nickel is hermetically joined by a brazed portion 20. Along the axis of such an outer conductor 10, the inner conductor 2
6 is disposed and passes through the ceramic disk 13. In this case, the inner conductor 26 is different from the conventional one and consists of an inner conductor cylindrical part 21 made of an iron/nickel alloy such as Kovar, and an inner conductor rod part 22 made of a high melting point metal such as molybdenum. The outer surface is copper plated to reduce high frequency resistance. The inner conductor rod-shaped portion 22 is connected to a helix (not shown). The inner conductor cylindrical portion 21 is made of ceramic disk 1.
The central hole 13a of No. 3 is hermetically sealed at a brazing portion 23 using a brazing material such as 72Ag-28Cu solder. The inner conductor rod-shaped portion 22 is connected to the airtight joint portion 2.
The inner conductor is inserted into the inner conductor cylindrical portion 21 so that its tip 22a is located at a position away from the inner conductor 3, and the cylindrical portion 21 and the rod portion 22 are connected and fixed by a brazing portion 24. The outer diameter of the inner conductor cylindrical portion 21 is larger than the outer diameter of the inner conductor rod portion 22 inserted into the inner conductor, and the connecting step 27 between the two is similar to the outer conductor small diameter portion 1.
It is located at a predetermined position on the inside of the coaxial line, and also serves as a step for impedance conversion of the coaxial line, which is originally required. A plug 25 made of molybdenum is inserted so as to close the tip opening exposed to the outside of the inner conductor cylindrical portion 21, and is fixed by brazing. [Effects of the invention] According to this invention, the hermetic joint between the ceramic disc 13 and the inner conductor 26 is brazed with the inner conductor cylindrical part 21, so that the connection to the helical conductor is achieved by the operation of the traveling wave tube. Even if the inner conductor rod-shaped portion 22 becomes hot or undergoes a temperature cycle, the inner conductor cylindrical portion 21 absorbs the strain, so there is little risk of damage. Therefore, the reliability of the hermetic solder joint is high. Furthermore, since no undesired protrusions are formed on the inner conductor 26 , excellent VSWR characteristics and broadband characteristics can be obtained. Moreover, since the connection step between the inner conductor cylindrical part and the inner conductor bar part also serves as a step for impedance conversion, there is no need to create a step by making the diameter of the inner conductor different, unlike in conventional structures. is easy.
第１図は従来のヘリツクス型進行波管における
同軸気密端子部を示す断面図、第２図はこの考案
の一実施例に係るヘリツクス型進行波管における
同軸気密端子部を示す断面図、第３図はセラミツ
ク円板を示す一部切欠断面図である。
１０……外導体、１２……外導体径大部、１５
……外導体径小部、１３……セラミツク円板、１
７……真空容器、１８……ヘリツクス導体、２
０，２３，２４……鑞付け部、２１……内導体筒
状部、２２……内導体棒状部、２６……内導体、
２７……接続段差。
FIG. 1 is a sectional view showing a coaxial hermetic terminal portion in a conventional helical traveling wave tube, FIG. 2 is a sectional view showing a coaxial hermetic terminal portion in a helical traveling wave tube according to an embodiment of the present invention, and FIG. The figure is a partially cutaway sectional view showing a ceramic disc. 10...Outer conductor, 12...Outer conductor large diameter part, 15
...Outer conductor small diameter part, 13...Ceramic disc, 1
7... Vacuum vessel, 18... Helix conductor, 2
0, 23, 24...brazing part, 21...inner conductor cylindrical part, 22...inner conductor rod-shaped part, 26 ...inner conductor,
27...Connection step.
Claims (1)
と、この真空容器の端部に管軸と直交する方向
に突設された同軸気密端子部とを備え、前記同
軸気密端子部は、上記真空容器に気密接合され
た外導体径小部の外方端部に外導体径大部が接
合され、この外導体径大部の内側にセラミツク
円板が気密接合されるとともに、上記ヘリツク
ス導体に接続された内導体が前記セラミツク円
板を気密に貫通してなるヘリツクス型進行波管
において、 上記同軸気密端子部の内導体は、上記ヘリツ
クス導体に接続された径小な内導体棒状部と、
この内導体棒状部の先端部に気密接合された径
大な内導体筒状部とを有し、これらの気密接合
部よりも外方の位置で前記内導体筒状部が上記
セラミツク円板に気密鑞接され、且つ前記外径
が異なる内導体棒状部と内導体筒状部との接続
段差が上記外導体径小部の内側に位置してイン
ピーダンス変換用ステツプを兼ねていることを
特徴とするヘリツクス型進行波管。 (2) 内導体筒状部は、鉄・ニツケル合金で形成さ
れ、内導体棒状部は高融点金属で形成されてな
る実用新案登録請求の範囲第１項記載のヘリツ
クス型進行波管。[Claims for Utility Model Registration] (1) A vacuum vessel having a helical conductor disposed therein, and a coaxial airtight terminal protruding from the end of the vacuum vessel in a direction perpendicular to the tube axis, In the coaxial airtight terminal portion, a large diameter portion of the outer conductor is joined to the outer end of a small diameter portion of the outer conductor that is hermetically joined to the vacuum container, and a ceramic disc is hermetically sealed inside the large diameter portion of the outer conductor. In a helical traveling wave tube in which an inner conductor connected to the helical conductor hermetically passes through the ceramic disc, the inner conductor of the coaxial airtight terminal portion has a diameter connected to the helical conductor. a small inner conductor rod-shaped part;
A large-diameter inner conductor cylindrical portion is hermetically joined to the tip of the inner conductor rod-shaped portion, and the inner conductor cylindrical portion is attached to the ceramic disc at a position outward from these airtight joints. A connecting step between the inner conductor rod-shaped portion and the inner conductor cylindrical portion, which are hermetically soldered and have different outer diameters, is located inside the outer conductor small-diameter portion and also serves as an impedance conversion step. A helical traveling wave tube. (2) The helical traveling wave tube according to claim 1, wherein the inner conductor cylindrical portion is made of an iron-nickel alloy, and the inner conductor rod portion is made of a high melting point metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17353383U JPS6080650U (en) | 1983-11-09 | 1983-11-09 | helix type traveling wave tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17353383U JPS6080650U (en) | 1983-11-09 | 1983-11-09 | helix type traveling wave tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6080650U JPS6080650U (en) | 1985-06-04 |
| JPH0228595Y2 true JPH0228595Y2 (en) | 1990-07-31 |
Family
ID=30378010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17353383U Granted JPS6080650U (en) | 1983-11-09 | 1983-11-09 | helix type traveling wave tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6080650U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS506281U (en) * | 1973-05-15 | 1975-01-22 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53147653U (en) * | 1977-04-25 | 1978-11-20 |
-
1983
- 1983-11-09 JP JP17353383U patent/JPS6080650U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS506281U (en) * | 1973-05-15 | 1975-01-22 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6080650U (en) | 1985-06-04 |
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