JPH0337322B2 - - Google Patents
Info
- Publication number
- JPH0337322B2 JPH0337322B2 JP60139286A JP13928685A JPH0337322B2 JP H0337322 B2 JPH0337322 B2 JP H0337322B2 JP 60139286 A JP60139286 A JP 60139286A JP 13928685 A JP13928685 A JP 13928685A JP H0337322 B2 JPH0337322 B2 JP H0337322B2
- Authority
- JP
- Japan
- Prior art keywords
- mode
- circular
- cavity resonator
- circular cavity
- waveguide
- 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
- 230000008878 coupling Effects 0.000 claims description 10
- 238000010168 coupling process Methods 0.000 claims description 10
- 238000005859 coupling reaction Methods 0.000 claims description 10
- 230000005684 electric field Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000005672 electromagnetic field Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910001374 Invar Inorganic materials 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Landscapes
- Waveguide Switches, Polarizers, And Phase Shifters (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は円形空胴共振器に係り、特に、不要な
共振モードの影響を除去するのに有効な円形空胴
共振器の構造に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a circular cavity resonator, and particularly to a structure of a circular cavity resonator that is effective in eliminating the influence of unnecessary resonance modes.
第３図Ａは一般的な円形空胴共振器の横断面図
であり、第３図Ｂは同じく縦断面図であつて、円
形導波管１を所望の共振周波数の管内波長λgに
合わせて、ｎ・λg／２（ｎ＝１、２、３、…）の
間隔で両端を短絡板２，３で仕切つた構造になさ
れている。
FIG. 3A is a cross-sectional view of a general circular cavity resonator, and FIG. 3B is a longitudinal cross-sectional view of a general circular cavity resonator. , n·λg/2 (n=1, 2, 3, . . . ), and both ends are partitioned by shorting plates 2 and 3.
円形空胴共振器の共振モードは共振器内の電磁
界の分布によつてTEモードとTMモードに分類
される。TEモードは更にTElmnモード（ｌ、
ｍ、ｎ＝１、２、３、…）に分けられ、また同様
にTMモードもTMlmnモードに分けられ、それ
ぞれ各モードに対して固有の共振周波数がある。
つまり、一個の円形空胴共振器には多くの共振モ
ードが共存しており、それぞれの共振モードに対
して共振周波数が存在する。 The resonance mode of a circular cavity resonator is classified into TE mode and TM mode depending on the electromagnetic field distribution inside the resonator. TE mode is further divided into TElmn mode (l,
m, n=1, 2, 3,...), and the TM mode is similarly divided into TMlmn modes, each of which has its own unique resonance frequency.
In other words, many resonance modes coexist in one circular cavity resonator, and each resonance mode has a resonance frequency.
さて、共振器では高いＱが要求される。前記各
モードのうちTE01nモードは、第３図Ａ，Ｂに示
す様に電界分布４が円形導波管１と同心円状であ
るため、壁面電流が流れることなく壁面電流によ
る損失はない。このため104以上の高いＱが容易
に得られることから、共振器には一般にTE01nモ
ードが利用される。 Now, a high Q is required for a resonator. Among the above modes, in the TE 01 n mode, the electric field distribution 4 is concentric with the circular waveguide 1 as shown in FIGS. 3A and 3B, so that no wall current flows and there is no loss due to the wall current. For this reason, the TE 01 n mode is generally used in the resonator because a high Q of 10 4 or more can be easily obtained.
TE01nモードのしや断波長λcは円形導波管１の
内径をＤとするとλc＝0.82Dで表わされるが、
TM11nモードのしや断波長もこれに等しく、両
モードは縮退している。このため、円形空胴共振
器を励振すると、TE01nモードとTM11nモードが
共に励振されてしまう。第４図Ａ，ＢはTM11n
モードの電界分布を示すものであつて、第４図Ａ
は第４図Ｂのｆ−ｆ断面における電界分布であ
る。TM11nモードの電界分布TE01nモードの電界
分布とは異なり、短絡板２，３の内面のａ−ａ線
上で、かつ円形導波管１の中心軸からＤ／４（Ｄ
は円形導波管内径）離れた２点ｂ、ｃに電気力線
が集中している。そして円形導波管１の内面と短
絡板２の内面に壁面電流７，８が流れ、壁面損失
や円形導波管１と短絡板２との境界での接触抵抗
による損失がある。このためTM11nモードの共
振周波数はTE01nモードの共振周波数に対してわ
ずかにずれが生じ、共振点が接近して２つ生じ
る。 TE 01 The shear cutoff wavelength λc of the n mode is expressed as λc = 0.82D, where D is the inner diameter of the circular waveguide 1.
The shearing wavelength of the TM 11 n mode is also equal to this, and both modes are degenerate. Therefore, when the circular cavity resonator is excited, both the TE 01 n mode and the TM 11 n mode are excited. Figure 4 A and B are TM 11 n
Figure 4A shows the electric field distribution of the mode.
is the electric field distribution in the ff section of FIG. 4B. TM 11 n-mode electric field distribution TE 01 Unlike the n-mode electric field distribution, on the a-a line of the inner surface of the shorting plates 2 and 3 and from the center axis of the circular waveguide 1 to D/4 (D
is the inner diameter of the circular waveguide) The electric lines of force are concentrated at two distant points b and c. Wall currents 7 and 8 flow on the inner surface of the circular waveguide 1 and the inner surface of the shorting plate 2, and there is loss due to wall surface loss and contact resistance at the boundary between the circular waveguide 1 and the shorting plate 2. Therefore, the resonance frequency of the TM 11 n mode is slightly shifted from the resonance frequency of the TE 01 n mode, and two resonance points are generated close to each other.
そこでTM11nモードの共振がTE01nモードの共
振に影響を与えないようにしてTE01nモードの共
振のみを利用する方法が種々試みられており、従
来この種の円形空胴共振器においては、TM11n
モードの共振周波数をずらず方法が用いられてい
る。その一つとして第５図に縦断面で示す構造の
円形空胴共振器がある。図中１は円形導波管であ
り、右方の一端は導波管１と一体に形成された短
絡板３で仕切られており、左方の一端は短絡板２
で仕切られている。これら円形導波管１および短
絡板２，３は線膨張係数が極めて小さな金属、た
とえばインバーで形成され、温度による寸法の変
化を極力小さくして共振周波数の変化が小さく抑
えられている。第６図は第５図に示した円形空胴
共振器のｅ−ｅ断面図であつて、９は円形導波管
１の円筒面に設けられた穴であり、この穴から外
部回路と接続するための結合ループ１０が引出さ
れている。また、短絡板２の内面には第４図Ａに
示す２点ｂ、ｃに誘電体１１，１１が設けられて
いる。誘電体には一例としてポリスチロールが用
いられ、その直径は円形導波管内径の1/6から1/8
程度であり、その高さは管内波長の1/10程度であ
る。この様な円形空胴共振器では誘電体１１を設
けることによつて、TM11nモードでは等価的に
電気力線が長くなり、従つて共振周波数が低下し
TE01nモードの共振周波数から離れるので、
TE01nモードへの影響を小さくすることが可能で
ある。 Therefore, various methods have been tried to prevent the TM 11 n-mode resonance from affecting the TE 01 n-mode resonance and utilize only the TE 01 n-mode resonance. is TM 11n
A method is used in which the resonance frequency of the mode is not shifted. One of them is a circular cavity resonator having a structure shown in longitudinal section in FIG. In the figure, 1 is a circular waveguide, one end on the right is partitioned by a shorting plate 3 formed integrally with the waveguide 1, and one end on the left is a shorting plate 2.
It is separated by These circular waveguide 1 and short-circuit plates 2 and 3 are made of a metal having an extremely small coefficient of linear expansion, such as invar, to minimize changes in dimensions due to temperature and to suppress changes in resonance frequency. FIG. 6 is a cross-sectional view of the circular cavity resonator shown in FIG. A connecting loop 10 is drawn out for the purpose of this. Furthermore, dielectrics 11 and 11 are provided on the inner surface of the shorting plate 2 at two points b and c shown in FIG. 4A. For example, polystyrene is used as the dielectric material, and its diameter is 1/6 to 1/8 of the inner diameter of the circular waveguide.
Its height is about 1/10 of the wavelength within the tube. In such a circular cavity resonator, by providing the dielectric 11, the lines of electric force become equivalently longer in the TM 11 n mode, and therefore the resonant frequency decreases.
TE 01 Since it is away from the n-mode resonance frequency,
It is possible to reduce the influence on the TE 01 n mode.
しかし、かかる構造の円形空胴共振器において
は、前記誘電体１１は短絡板２とは別部材であ
り、短絡板２に接着剤等を用いて正確な位置に取
付けることが要求され、その位置からずれると
TM11nモードの電磁界分布が変化してしまい、
その結果として不必要な他のモードを励振してし
まう可能性がある。また、TM11nモードの除去
効果を高める目的で誘電体１１の寸法を大きくす
るとTE01nモードの電磁界分布にも影響を与え、
TE01nモードの共振周波数が設計値からずれたり
Ｑが低下する原因になる。更に、誘電体１１の線
膨張係数は、円形導波管１及び短絡板２，３の金
属材料の線膨張係数と比較して10倍程度大きい。
従つてTE01nモードの共振周波数に対するTM11n
モードの共振周波数の差が温度によつて変化する
などの各種の問題点がある。
However, in a circular cavity resonator having such a structure, the dielectric 11 is a separate member from the shorting plate 2, and is required to be attached to the shorting plate 2 at an accurate position using an adhesive or the like. If it deviates from
TM 11 The electromagnetic field distribution of n mode changes,
As a result, other unnecessary modes may be excited. Furthermore, if the dimensions of the dielectric 11 are increased in order to enhance the removal effect of the TM 11 n mode, it will also affect the electromagnetic field distribution of the TE 01 n mode.
TE 01 This may cause the n-mode resonance frequency to deviate from the design value or cause Q to decrease. Furthermore, the linear expansion coefficient of the dielectric 11 is about 10 times larger than that of the metal materials of the circular waveguide 1 and the short circuit plates 2 and 3.
Therefore, TM 11 n for the resonant frequency of TE 01 n mode
There are various problems such as the difference in the resonance frequency of the modes changing depending on the temperature.
本発明の目的は、上記の従来技術の問題点を取
り除き、TE01nモードに影響を与えない範囲に
TM11nモードの共振周波数をずらせた円形空胴
共振器を得ることにある。 The purpose of the present invention is to eliminate the above-mentioned problems of the prior art and to solve the problem within a range that does not affect the TE 01 n mode.
TM 11 The objective is to obtain a circular cavity resonator in which the n-mode resonance frequency is shifted.
上記の目的達成のため、本発明による円形空胴
共振器は、円形導波管の両端を短絡板で仕切り円
筒面に設けた穴から外部回路に接続する結合ルー
プを引き出した構造の円形空胴共振器において、
短絡板の内面であつてかつ円形導波管の軸方向か
ら見て結合ループの側および結合ループの反対側
にそれぞれ設けられ、円弧部を円形導波管の内面
円周に一致させて配置された弓形の凹部を備えて
いる。
In order to achieve the above object, a circular cavity resonator according to the present invention has a structure in which both ends of a circular waveguide are partitioned by shorting plates and a coupling loop connected to an external circuit is drawn out from a hole provided in the cylindrical surface. In the resonator,
They are provided on the inner surface of the short-circuiting plate and on the side of the coupling loop and the opposite side of the coupling loop when viewed from the axial direction of the circular waveguide, and are arranged so that the arc portion matches the inner circumference of the circular waveguide. It has an arch-shaped recess.
円形空胴共振器の短絡板内面に共振器を成す円
形導波管に接する凹部を設けたので、TM11nモ
ードの共振において短絡板及び円形導波管に流れ
る壁面電流は、その凹部を経由して流れることに
なり、径路が長くなる。従つて、TM11nモード
の共振においては共振波長がより長いものとな
り、TE01nモードの共振波長とは十分に異なつた
共振波長にすることが出来る。
Since a recess is provided on the inner surface of the shorting plate of the circular cavity resonator in contact with the circular waveguide forming the resonator, the wall current flowing through the shorting plate and the circular waveguide during TM 11 n-mode resonance passes through the recess. Therefore, the path becomes longer. Therefore, in the resonance of the TM 11 n mode, the resonance wavelength becomes longer and can be made to be sufficiently different from the resonance wavelength of the TE 01 n mode.
本発明を第１図及び第２図の実施例に基づいて
説明する。第１図は本発明による円形空胴共振器
の縦断面図であり、第２図は第１図ｄ−ｄ断面図
である。なお第１図、第２図に示す円形空胴共振
器において、第５図、第６図に示す従来例の円形
空胴共振器と同一の部材には同一の符号を付けて
重複する説明を省略する。
The present invention will be explained based on the embodiments shown in FIGS. 1 and 2. FIG. 1 is a longitudinal sectional view of a circular cavity resonator according to the present invention, and FIG. 2 is a sectional view taken along line dd in FIG. In the circular cavity resonator shown in FIGS. 1 and 2, the same members as those in the conventional circular cavity resonator shown in FIGS. Omitted.
図中１２は短絡板であつて、その内面に弓形を
した２個の凹部１３，１４が設けられている。い
ずれの凹部１３，１４もその円弧部分が円形導波
管１の内面円周に一致するように形成されてお
り、一方の凹部１３は円形導波管１に設けられた
結合ループ１０の側に位置し、もう一つの凹部１
４は結合ループ１０とは反対側に位置している。 In the figure, reference numeral 12 denotes a short circuit plate, and two arch-shaped recesses 13 and 14 are provided on its inner surface. Both of the recesses 13 and 14 are formed so that their arc portions match the inner circumference of the circular waveguide 1, and one recess 13 is located on the side of the coupling loop 10 provided in the circular waveguide 1. located another recess 1
4 is located on the opposite side from the coupling loop 10.
これらの凹部１３，１４の深さはTM11nモー
ドの共振周波数をどの位ずらすかによつて決めら
れ、深さを増せば凹部１３，１４の表面を径て円
形導波管に流れる壁面電流の径路が長くなる結
果、TM11nモードの共振周波数は低くなる。 The depth of these recesses 13 and 14 is determined by how much the resonant frequency of the TM 11 n mode is shifted, and as the depth increases, the wall current flowing through the surface of the recesses 13 and 14 into the circular waveguide increases. As a result of the longer path, the resonant frequency of the TM 11 n mode becomes lower.
以上説明した様に、本発明によれば円形空胴共
振器の短絡板１２の内面に凹部１３，１４を設け
た構造にしたので、TM11nモードの共振周波数
をTE01nモードの共振周波数に影響しない範囲に
ずらすことができて、TE01nモードのみを有効に
利用することが出来る。凹部１３，１４は
TM11nモードだけに作用しTE01nモードに対して
は影響がないので、TE01nモードにおけるＱや外
部回路との結合度は低下しない。また、円形空胴
共振器内に異種の材料を用いる必要がないので、
円形導波管１及び短絡板１２の材料には線膨張係
数が十分に小さい材料を使用することが出来、共
振周波数の温度に対する変化を小さくすることが
出来る。更に凹部１３，１４は短絡板１２に設け
られたものであり別部材を用いないため、円形空
胴共振器の組立作業性を著しく向上させることが
出来る。
As explained above, according to the present invention, since the recesses 13 and 14 are provided on the inner surface of the shorting plate 12 of the circular cavity resonator, the resonant frequency of the TM 11 n mode is changed from the resonant frequency of the TE 01 n mode. TE 01 n mode can be used effectively. The recesses 13 and 14 are
Since it acts only on the TM 11 n mode and has no effect on the TE 01 n mode, the Q in the TE 01 n mode and the degree of coupling with external circuits do not decrease. Also, since there is no need to use different materials inside the circular cavity resonator,
Materials having a sufficiently small coefficient of linear expansion can be used for the circular waveguide 1 and the short circuit plate 12, so that changes in the resonant frequency with respect to temperature can be made small. Further, since the recesses 13 and 14 are provided in the shorting plate 12 and no separate members are used, the efficiency of assembling the circular cavity resonator can be significantly improved.
第１図は本発明の一実施例を示す円形空胴共振
器の縦断面図、第２図は第１図のｄ−ｄ断面図、
第３図Ａ，ＢはTE01nモードの電界分布図、第４
図Ａ，ＢはTM11nモードの電界分布図、第５図
は従来における円形空胴共振器の縦断面図、第６
図は第５図のｅ−ｅ断面図である。
１……円形導波管、９……穴、１０……結合ル
ープ、１２……短絡板、１３，１４……凹部。
FIG. 1 is a longitudinal cross-sectional view of a circular cavity resonator showing an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line dd in FIG. 1,
Figures 3A and B are electric field distribution diagrams of TE 01 n mode, Figure 4
Figures A and B are electric field distribution diagrams of TM 11 n mode, Figure 5 is a longitudinal cross-sectional view of a conventional circular cavity resonator, and Figure 6 is a longitudinal cross-sectional view of a conventional circular cavity resonator.
The figure is a sectional view taken along line ee in FIG. 1... Circular waveguide, 9... Hole, 10... Coupling loop, 12... Short circuit plate, 13, 14... Recess.
Claims (1)
に設けた穴から外部回路に接続する結合ループを
引き出した構造の円形空胴共振器において、前記
短絡板の内面であつてかつ前記円形導波管の軸方
向から見て前記結合ループの側および結合ループ
の反対側にそれぞれ設けられ、円弧部を前記円形
導波管の内面円周に一致させて配置された弓形の
凹部を備えたことを特徴とする円形空胴共振器。1. In a circular cavity resonator having a structure in which both ends of a circular waveguide are partitioned by a shorting plate and a coupling loop connected to an external circuit is drawn out from a hole provided in the cylindrical surface, the inner surface of the shorting plate and the circular An arcuate recess is provided on the side of the coupling loop and on the opposite side of the coupling loop when viewed from the axial direction of the waveguide, and the arcuate portion is arranged to match the inner circumference of the circular waveguide. A circular cavity resonator characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13928685A JPS62103A (en) | 1985-06-26 | 1985-06-26 | Circular cavity resonator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13928685A JPS62103A (en) | 1985-06-26 | 1985-06-26 | Circular cavity resonator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62103A JPS62103A (en) | 1987-01-06 |
| JPH0337322B2 true JPH0337322B2 (en) | 1991-06-05 |
Family
ID=15241741
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13928685A Granted JPS62103A (en) | 1985-06-26 | 1985-06-26 | Circular cavity resonator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62103A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008039703A (en) * | 2006-08-09 | 2008-02-21 | Sumitomo Bakelite Co Ltd | Electromagnetic characteristic measuring tool and measuring method |
| WO2010125806A1 (en) * | 2009-04-28 | 2010-11-04 | 日本電気株式会社 | Waveguide filter and communication access device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50122149A (en) * | 1974-03-13 | 1975-09-25 |
-
1985
- 1985-06-26 JP JP13928685A patent/JPS62103A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50122149A (en) * | 1974-03-13 | 1975-09-25 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62103A (en) | 1987-01-06 |
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