JP2922933B2 - Magnetron - Google Patents
MagnetronInfo
- Publication number
- JP2922933B2 JP2922933B2 JP25522689A JP25522689A JP2922933B2 JP 2922933 B2 JP2922933 B2 JP 2922933B2 JP 25522689 A JP25522689 A JP 25522689A JP 25522689 A JP25522689 A JP 25522689A JP 2922933 B2 JP2922933 B2 JP 2922933B2
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- JP
- Japan
- Prior art keywords
- resonance
- frequency
- choke
- magnetron
- cavity
- 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
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Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、マイクロ波応用機器たとえば電子レンジ等
に使用する連続波マグネトロンから、高調波やモーディ
ング周波数等の特定の高い周波数の電波が漏洩するのを
抑制する構造に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a continuous wave magnetron used for microwave application equipment, for example, a microwave oven or the like, in which a radio wave of a specific high frequency such as a harmonic or a moding frequency leaks. To a structure that suppresses
［従来の技術］ 電子レンジは家庭用調理器として広く作用されている
が、そのマイクロ波電力を発生させるのに使用するマグ
ネトロンからの漏洩電波による他の高周波電子機器に対
する雑音障害が問題になっている。2. Description of the Related Art Microwave ovens are widely used as home cookers, but there is a problem of noise interference to other high-frequency electronic devices due to radio waves leaking from a magnetron used to generate microwave power. I have.
上記問題に対して、例えば実開昭61−161946号公報に
は、マグネトロンの出力取り出し部に、複数個の並列共
振空洞をよりなるチョーク構造を配置することが開示さ
れている。To solve the above problem, Japanese Utility Model Application Laid-Open No. 61-161946 discloses that a choke structure including a plurality of parallel resonant cavities is arranged at an output extraction portion of a magnetron.
［発明が解決しようとする課題］ しかし、上記従来の対策技術は、複数個のチョーク構
造を出力部に配設することを述べているが、チョーク構
造の配置方法については言及しておらず、この技術によ
り最大の効果が得られているとは言えなかった。[Problems to be Solved by the Invention] However, the above-described conventional countermeasure technology describes that a plurality of choke structures are provided in the output unit, but does not mention a method of arranging the choke structures. This technique was not the most effective.
本発明は、マグネトロンの出力取り出し部に複数個の
チョーク構造を配設して不要高調波の漏洩を抑制する上
記漏洩防止技術が最大限まで効果を発揮するようにした
マグネトロンを提供することを目的とする。An object of the present invention is to provide a magnetron in which a plurality of choke structures are arranged at an output extraction portion of the magnetron to suppress the leakage of unnecessary harmonics so that the above-described leakage prevention technology can exert its maximum effect. And
［課題を解決するための手段］ 上記目的を達成するために本発明においては、出力取
り出し部に、抑止すべき特定な二つ以上の周波数に対
し、帯域消去フィルタとして、並列共振する共振空洞を
３個以上備えたマグネトロンにおいて、前記３個以上の
共振空洞を、それぞれの共振周波数が、陽極空洞共振器
側から順次、低い方から高い方へ、又は、高い方から低
い方への順で、それ自体または隣接する共振空洞の共振
周波数における管内波長の1/4ずつ隔てて配設すること
にした。[Means for Solving the Problems] In order to achieve the above object, in the present invention, a resonance cavity that resonates in parallel as a band elimination filter for two or more specific frequencies to be suppressed is provided in an output extraction unit. In the magnetron provided with three or more, the three or more resonant cavities are sequentially arranged in order from the anode cavity resonator side, from the lower side to the higher side, or from the higher side to the lower side. It is arranged at a distance of 1/4 of the guide wavelength at the resonance frequency of itself or the adjacent resonance cavity.
［作用］ 例えば仮りに、第１のチョーク（並列共振空洞）が、
第５高調波である12.25GHzに共振し、第２のチョークが
第３高調波7.35GHzに共振し、第３のチョークが第５高
調波12.25GHzに共振していると仮定し、更に、第１のチ
ョークと第２のチョークとは第５高調波の管内波長の1/
4の間隔で、また第２のチョークと第３のチョークも、
第５高調波の管内波長の1/4のピッチで配設されている
ものと仮定する。[Operation] For example, if the first choke (parallel resonant cavity) is
Assuming that the fifth harmonic resonates at 12.25 GHz, the second choke resonates at the third harmonic 7.35 GHz, and the third choke resonates at the fifth harmonic 12.25 GHz, The 1st choke and the 2nd choke are 1/1 of the guide wavelength of the fifth harmonic.
At intervals of four, and the second and third chokes,
It is assumed that they are arranged at a pitch of 1/4 of the guide wavelength of the fifth harmonic.
第１のチョークから第３のチョークを見ると、第３の
チョークは1/2波長の距離に存在するので、理想状態で
考えると、第１のチョークを見るインピーダンスと、第
３のチョークを見るインピーダンスが同じであるため、
第５高調波においては、第１のチョークの効果は半分す
なわち3dBの効果しかない。Looking at the third choke from the first choke, since the third choke exists at a distance of 1/2 wavelength, when considered in an ideal state, the impedance to see the first choke and the third choke to see Because the impedance is the same,
At the fifth harmonic, the effect of the first choke is only half or 3 dB.
これに対し、第１のチョークと第２のチョークが、第
５高調波である12.25GHzに共振し、第３のチョークが、
第３高調波7.35GHzに共振し、３個のチョークは第５高
調波の管内波長の1/4のピッチで配設されていると仮定
する。On the other hand, the first choke and the second choke resonate at 12.25 GHz, which is the fifth harmonic, and the third choke has
It is assumed that the third harmonic resonates at 7.35 GHz and the three chokes are arranged at a pitch of 1/4 of the guide wavelength of the fifth harmonic.
この場合は、第１のチョークから第２のチョークを見
ると、第２のチョークは1/4波長の距離に存在するの
で、理想状態で考えると、第２のチョークを見るインピ
ーダンスが零となるのに対して、第１のチョークはイン
ピーダンスが無限大になるので、第１のチョークと第２
のチョークの効果は、各々の乗算（dBでは和）となり、
大きな効果を示す。In this case, when the second choke is viewed from the first choke, the second choke exists at a distance of 1/4 wavelength, and therefore, in an ideal state, the impedance for viewing the second choke becomes zero. On the other hand, since the first choke has an infinite impedance, the first choke and the second choke
The effect of the choke is each multiplication (sum in dB)
Shows great effect.
［実施例］ 第１図は本発明の一実施例の要部断面図であって、１
は陽極円筒、２はベイン、３は図示してない永久磁石に
より管軸方向に磁界を集束形成させるための磁極、４と
５は出力側封止筒状部材、６は一つのベインに接続され
て図示してない陽極空洞に発生したマイクロ波エネルギ
ーを出力端子（アンテナ）に導くアンテナリード、７は
セラミックス等で作られた絶縁性のドーム（出力側絶縁
物）で、出力側封止部材４、５と気密封止されている。
８はチョーク用共振空洞を形成するキャップ状金属部材
で、頭部にはアンテナが貫通する孔があけられている。
９と10は共振空洞を形成する別のハット状金属部材で、
つばの端部でキャップ状金属部材８に固着されている。
ハット状金属部材９の円筒部の先端はキャップ状金属部
材８の頭部に対向して配置され、ハット状金属部材10の
円筒部の先端はハット状金属部材９のつばのねもと（円
筒部からつばに移行する個所）に対向している。FIG. 1 is a sectional view of a main part of an embodiment of the present invention.
Is an anode cylinder, 2 is a vane, 3 is a magnetic pole for converging and forming a magnetic field in the tube axis direction by a permanent magnet (not shown), 4 and 5 are output-side sealing tubular members, and 6 is connected to one vane. An antenna lead for guiding microwave energy generated in an anode cavity (not shown) to an output terminal (antenna); and 7, an insulating dome (output side insulator) made of ceramics or the like; , 5 are hermetically sealed.
Numeral 8 is a cap-shaped metal member forming a choke resonance cavity, and has a hole in the head through which the antenna passes.
9 and 10 are other hat-shaped metal members forming a resonance cavity,
The end of the collar is fixed to the cap-shaped metal member 8.
The tip of the cylindrical portion of the hat-shaped metal member 9 is arranged to face the head of the cap-shaped metal member 8, and the tip of the cylindrical portion of the hat-shaped metal member 10 is positioned at the brim of the hat-shaped metal member 9. (Where the part transitions to the collar).
この例では、Q1,Q2,Q3の３個の共振空洞が形成されて
いる。このうち、Q2とQ3が同じ特定の周波数に共振する
ように、ハット状金属部材９、10の円筒部の長さが調整
されている。In this example, three resonant cavities Q 1 , Q 2 and Q 3 are formed. Among them, as Q 2 and Q 3 resonate at the same specific frequency, length of the cylindrical portion of the hat-shaped metal member 9, 10 is adjusted.
キャップ状金属部材８とハット状金属部材９、10の厚
さを0.5mmとし、図示の各寸法をd1＝9mm、d2＝19mm、g1
＝2.5mm、g2＝2.0mmとしたときは、共振空洞Q2の共振点
は約12.25GHzとなり、電子レンジに使用されるマグネト
ロンの基本波の第５高調波周波数にほぼ一致した。ま
た、g1＝3.0mm、g2＝3.5mmとした場合にも、約12.25GHz
で共振空洞Q2が共振した。The thickness of the cap-shaped metal member 8 and the hat-shaped metal members 9 and 10 is 0.5 mm, and the dimensions shown are d 1 = 9 mm, d 2 = 19 mm, g 1
When = 2.5 mm and g 2 = 2.0 mm, the resonance point of the resonant cavity Q 2 was about 12.25 GHz, which almost coincided with the fifth harmonic frequency of the fundamental wave of the magnetron used in the microwave oven. Also, when g 1 = 3.0 mm and g 2 = 3.5 mm, about 12.25 GHz
Resonant cavity Q 2 resonates in.
更に、g1＝3.0mm、g2＝3.0mmでは約12GHzで共振し
た。また、ハット状金属部材10の内径を11.5mm（＝
d1）、g1＝3.0mmとしたときは、g2＝2.0mmで共振空洞Q2
の共振周波数が約12GHzとなった。Further, when g 1 = 3.0 mm and g 2 = 3.0 mm, resonance occurred at about 12 GHz. The inner diameter of the hat-shaped metal member 10 is 11.5 mm (=
d 1 ), when g 1 = 3.0 mm, the resonance cavity Q 2 with g 2 = 2.0 mm
Became about 12 GHz.
共振空洞Q3の共振周波数と、キャップ状金属部材８と
ハット状金属部材９、10の各寸法の関係も、上記と同じ
結果になることは、容易に推定できる。The resonant frequency of the resonant cavity Q 3, the relationship of dimensions of the cap-like metal member 8 and the hat-shaped metal member 9, that the same results as above can easily estimated.
上記のように、空洞共振器のアンテナ軸方向の寸法、
即ち（g1＋g2）又は（g3＋g4）は自由に調整でき、同様
に、その共振周波数も自由に調整できる。As described above, the dimension of the cavity resonator in the antenna axial direction,
That is, (g 1 + g 2 ) or (g 3 + g 4 ) can be freely adjusted, and similarly, its resonance frequency can be freely adjusted.
従って、複数個の共振空洞を特定周波数における0.2
〜0.3波長の範囲の間隔で配設することも容易である。
例えば、上記g1＝2.5mm、g2＝2.0mmの場合は、（g1＋
g2）＝4.5mmであるが、この場合は、例えばハット状金
属部材９のつば部の板厚を0.5mmから1.5mmとすることに
より、共振空洞の間隔を調整することもできる。Therefore, a plurality of resonant cavities are set to 0.2 at a specific frequency.
It is also easy to arrange them at intervals in the range of 0.3 wavelength.
For example, when g 1 = 2.5 mm and g 2 = 2.0 mm, (g 1 +
g 2 ) = 4.5 mm. In this case, the gap between the resonance cavities can be adjusted by, for example, setting the thickness of the brim portion of the hat-shaped metal member 9 to 0.5 mm to 1.5 mm.
以上の説明では、空洞Q2、Q3の形状を同じものとした
が、共振周波数が特定周波数の近傍に夫々あれば、寸法
上の相違があっても良好な結果が得られる。例えば空洞
Q2はd1＝9mm、g3＝3.0mm、g4＝3.5mmとすると、間隔
（ピッチ）ｐは、ｐ＝（g212＋g3＋g4/2）＝5.75mmとな
り、良好な結果が得られた。この場合は二つの共振点が
僅かに異なるため、広い周波数範囲にわたって大きな抑
止効果が得られる。In the above description, the shapes of the cavities Q 2 and Q 3 are the same, but good results can be obtained even if there are dimensional differences if the resonance frequencies are each near the specific frequency. For example, a cavity
If Q 2 is d 1 = 9 mm, g 3 = 3.0 mm, and g 4 = 3.5 mm, the interval (pitch) p is p = (g 2 12 + g 3 + g 4 /2)=5.75 mm, and a good result is obtained. Obtained. In this case, since the two resonance points are slightly different, a large suppression effect can be obtained over a wide frequency range.
共振周波数を特定周波数の近傍に設定する場合には、
複数の共振空洞の少なくとも一つの共振周波数を、上記
特定周波数より略０〜５％高い周波数に設定し、他の共
振空洞の少なくとも一つの共振周波数を、上記特定周波
数より略０〜５％低い周波数に設定して、特定周波数に
対して周波数の高い側と低い側とに共振点をずらすこと
によって特定周波数の不要電波の放射を広い範囲で抑止
できる。When setting the resonance frequency near a specific frequency,
At least one resonance frequency of the plurality of resonance cavities is set to a frequency approximately 0-5% higher than the specific frequency, and at least one resonance frequency of the other resonance cavities is set to a frequency approximately 0-5% lower than the specific frequency. By shifting the resonance point between the higher frequency side and the lower frequency side with respect to the specific frequency, it is possible to suppress the emission of the unnecessary radio wave of the specific frequency in a wide range.
［発明の効果］ 以上説明したように本発明によれば、出力取り出し部
に沿って取付けた並列共振空洞の機能を効率良く発揮さ
せて、二つ以上の特定周波数の不要電波の放射を広く抑
制したマグネトロンが得られる。[Effects of the Invention] As described above, according to the present invention, the function of the parallel resonant cavity attached along the output extraction portion is efficiently exhibited, and the emission of unnecessary radio waves of two or more specific frequencies is widely suppressed. Magnetron is obtained.
第１図は本発明の一実施例の要部断面図である。 １……陽極円筒、２……ベイン、３……永久磁石による
磁界を形成させる磁極、４、５……出力側封止筒状部
材、６……アンテナリード、７……絶縁性のドーム、８
……キャップ状金属部材、９、10……ハット状金属部
材、Q1、Q2、Q3……共振空洞。FIG. 1 is a sectional view of a main part of an embodiment of the present invention. 1 ... Anode cylinder, 2 ... Vane, 3 ... Magnetic pole for forming a magnetic field by a permanent magnet, 4,5 ... Output side sealing tubular member, 6 ... Antenna lead, 7 ... Insulating dome, 8
...... cap-like metal member, 9, 10 ...... hat-shaped metal member, Q 1, Q 2, Q 3 ...... resonant cavity.
Claims (2)
し、帯域消去フィルタとして、並列共振する共振空洞を
備えたマグネトロンにおいて、抑止すべき特定な二つの
周波数に対し前記共振空洞を３個以上備え、前記３個以
上の共振空洞は、それぞれの共振周波数が陽極空洞共振
器側から順次低い方から高い方への順で配設してあり、
それ自体又は隣接する共振空洞の抑止すべき特定な周波
数の0.2〜0.3波長の範囲の間隔で配設してあり、前記３
個以上の共振空洞の一部が出力側絶縁物の内側に位置し
ていることを特徴とするマグネトロン。1. A magnetron having a resonance cavity that resonates in parallel as a band elimination filter with respect to a frequency to be suppressed in an output extraction unit. In the magnetron, three or more resonance cavities are used for two specific frequencies to be suppressed. Wherein the three or more resonance cavities are arranged in order from the lower side to the higher side, each of which has a resonance frequency from the anode cavity resonator side,
The resonators are arranged at intervals in the range of 0.2 to 0.3 wavelengths of a specific frequency to be suppressed by itself or an adjacent resonance cavity.
A magnetron, wherein at least a part of the resonance cavities is located inside the output-side insulator.
沿って、それ自体または隣接する共振空洞の共振周波数
における管内波長の1/4ずつ隔てて配設されていること
を特徴とする請求項１記載のマグネトロン。2. The method according to claim 1, wherein three or more resonance cavities are arranged along the output extraction portion at a distance of 1/4 of a guide wavelength at the resonance frequency of the resonance cavity of itself or an adjacent resonance cavity. The magnetron according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25522689A JP2922933B2 (en) | 1989-10-02 | 1989-10-02 | Magnetron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25522689A JP2922933B2 (en) | 1989-10-02 | 1989-10-02 | Magnetron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03119635A JPH03119635A (en) | 1991-05-22 |
| JP2922933B2 true JP2922933B2 (en) | 1999-07-26 |
Family
ID=17275785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25522689A Expired - Lifetime JP2922933B2 (en) | 1989-10-02 | 1989-10-02 | Magnetron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2922933B2 (en) |
-
1989
- 1989-10-02 JP JP25522689A patent/JP2922933B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03119635A (en) | 1991-05-22 |
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