JPS6258162B2 - - Google Patents
Info
- Publication number
- JPS6258162B2 JPS6258162B2 JP18721582A JP18721582A JPS6258162B2 JP S6258162 B2 JPS6258162 B2 JP S6258162B2 JP 18721582 A JP18721582 A JP 18721582A JP 18721582 A JP18721582 A JP 18721582A JP S6258162 B2 JPS6258162 B2 JP S6258162B2
- Authority
- JP
- Japan
- Prior art keywords
- waveguide
- height
- low
- frequency
- mode
- 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
- 239000002184 metal Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 3
- 230000013011 mating Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000004018 waxing Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Description
(1) 発明の技術分野
本発明は、矩形導波管形低域波器に係り、特
に、構造が簡単で特定の高域周波数帯を阻止する
低域波器に関する。
(2) 従来技術及び問題点
従来の導波管形の低域波器を第１図ａ，ｂに
示す。これは、ワツフルアイアン形とも呼ばれ、
導波管内に大小の突起が配置されている。それぞ
れの突起の寸法は、高精度が要求される。そのた
め数値制御加工機（NC）などにより切削するこ
とにより作られ、その加工に多くの時間がかか
る。そればかりでなく、導波管内部を加工するの
で、波器自体を２つ以上に分割加工後に、組み
合せる構造となり、合せ面のラツピング、合せ位
置出し用のノツクピン、フランジ面の合せ加工な
どが必要である。
(3) 発明の目的及び構成
本発明は、上記の欠点を除去し、ロストワツク
スあるいはキヤステイングなどにより製造できる
簡単な低域波器を提供することを目的とし、こ
のような目的は、本発明によれば矩形導波管を用
いた低域波器において、該導波管の一部の高さ
を特定の高調波においてTE20モードを除く高次
モードが発生しない様な寸法まで低く、該高さを
低くした部分に導波管の管軸に対し直交し且つ平
行に第１の金属ポスト群を設け、更に別の金属ポ
スト群を基本波の管内波長の1/4のほぼ奇数倍の
間隔で該第１のポスト群と同様に設けたことを特
徴とする低域波器によつて達成される。
(4) 発明の実施例
通信装置に使用される低域波器は、高域全て
を阻止する特性は必要でなく、発振器や増幅器か
ら発生する高調波を阻止すれば、その機能として
十分である。本発明は、この点に着目したもので
以下実施例に従つて説明する。
本発明は、導波管の高さを第２図に示すTE20
モードを除く高次モードが伝達しないような寸法
とし、第３図のように導波管のＨ面（広い面）
に、金属ポスト（例えばネジ）を４本挿入したも
のである。金属ポスト４本の関係は、第２図に示
すTE20モードを阻止するように２本、さらに基
本波の管内波長λｇの約1/4の奇数倍に同じよう
に２本挿入することにより、基本波のインピータ
ンス整合を取るようにしたものである。また、導
波管内に挿入されるポストの長さは、阻止する周
波数が共振する長さとしたものである。
以下詳細に説明する。
導波管のTEmn，TMmnモードによるカツトオ
フ周波数の波長は、次式より求められる。
(1) Technical Field of the Invention The present invention relates to a rectangular waveguide type low-frequency wave device, and particularly to a low-frequency wave device that has a simple structure and blocks a specific high frequency band. (2) Prior art and problems A conventional waveguide-type low-frequency wave generator is shown in Figures 1a and 1b. This is also called the Watsuful iron shape,
Large and small protrusions are arranged inside the waveguide. High precision is required for the dimensions of each protrusion. Therefore, they are made by cutting with a numerically controlled processing machine (NC), which takes a lot of time. Not only that, since the inside of the waveguide is processed, the waveguide itself is divided into two or more parts and then assembled, and processing such as wrapping of the mating surfaces, dowel pins for positioning the mating, and mating of the flange surfaces, etc. is necessary. (3) Object and structure of the invention The object of the present invention is to eliminate the above-mentioned drawbacks and provide a simple low-frequency device that can be manufactured by lost waxing or casting. According to the authors, in a low-frequency waveguide using a rectangular waveguide, the height of a part of the waveguide is reduced to such a dimension that no higher-order modes except the TE 20 mode occur at a specific harmonic; A first group of metal posts is provided perpendicularly and parallel to the tube axis of the waveguide in the lowered part, and another group of metal posts are placed at intervals of approximately an odd multiple of 1/4 of the wavelength of the fundamental wave in the tube. This is achieved by a low-frequency amplifier characterized in that it is provided similarly to the first post group. (4) Embodiments of the invention A low frequency device used in a communication device does not need to have the characteristic of blocking all high frequencies; it is sufficient for its function to block harmonics generated from an oscillator or amplifier. . The present invention focuses on this point and will be described below with reference to Examples. In the present invention, the height of the waveguide is TE 20 as shown in FIG.
The dimensions should be such that higher-order modes other than the mode are not transmitted, and the H-plane (wide side) of the waveguide is made as shown in Figure 3.
In this case, four metal posts (for example, screws) are inserted. The relationship between the four metal posts is as follows: two are inserted to block the TE 20 mode shown in Figure 2, and two are inserted in the same way at odd multiples of about 1/4 of the fundamental wavelength λg. This is designed to match the impedance of the fundamental wave. Further, the length of the post inserted into the waveguide is such that the frequency to be blocked resonates. This will be explained in detail below. The wavelength of the cutoff frequency due to the TEmn and TMmn modes of the waveguide can be obtained from the following equation.
【式】ただし、
ａは導波管の長辺の長さ
ｂは導波管の短辺の長さ
例えば、WRJ―140の導波管を使用し、12GHzを
使用帯域として、２倍波を阻止する場合、
ａ＝15.799mm ｂ＝5.5mmと選び、カツトオフ
周波数をｃとすると
TE01，モードでは、
Fc＝27254MHz
TE11，TM11
Fc＝28858MHz
TE21，TM21
Fc＝33209MHz
TE12，TM12
Fc＝55327MHz
となり、12GHzの２倍波24GHzは、遮断される。
しかし、TE20モードについては、Fc＝18975M
Hzで導波管の長辺を短かくしないかぎり阻止でき
ない。ところが長辺を短かくすると、基本波の
TE10モードまで、阻止してしまうことになる。
そこで本発明は、TE20モードの電界の強い位
置に金属ポストを２本挿入することにより、
TE20モードを阻止し、かつ導波管内部への金属
ポスト挿入長を２倍波に共振する長さにすること
により、２倍波を阻止する。そして、基本波の管
内波長λｇの約1/4の奇数倍の間隔で、少なくと
も合計４本の金属ポストで、基本波のインピータ
ンス整合したものである。
第４図に本発明の具体的実施例を示す。
導波管の高さを減しているため、マツチングを
とるために、ステツプ変換５で高さをもとにもど
している。金属ポスト６はネジを使い、４本挿入
している。また、実際のネジの間隔は、ネジの太
さの影響等があるため、基本波管内波長λｇの1/
４より短かくなる。また、ネジの本数を増すこと
により広帯域な特性が得られる。本発明の実施例
によれば簡単な構造で、第５図のように特定の周
波数を阻止する低域波器が実現できた。また、
ネジの挿入長を変え、さらに導波管の高さを減し
たりすれば、３倍波、その他の周波数も阻止する
ことができる。
(5) 発明の効果
本発明によれば、ロストワツクスあるいは、キ
ヤステイングなどにより製造できる低価格で、特
性の十分な低域波器が実現できる。[Formula] Where, a is the length of the long side of the waveguide b is the length of the short side of the waveguide For example, using a WRJ-140 waveguide and using 12GHz as the operating band, calculate the second harmonic. When blocking, select a = 15.799mm b = 5.5mm, and let the cutoff frequency be c. In TE 01 , mode, Fc = 27254MHz TE 11 , TM 11 Fc = 28858MHz TE 21 , TM 21 Fc = 33209MHz TE 12 , TM 12 Fc=55327MHz, and the second harmonic of 12GHz, 24GHz, is blocked. However, for TE 20 mode, Fc=18975M
Hz and cannot be blocked unless the long sides of the waveguide are shortened. However, if the long sides are shortened, the fundamental wave
This will prevent it from reaching TE 10 mode. Therefore, in the present invention, by inserting two metal posts at positions where the electric field is strong in the TE 20 mode,
The second harmonic is blocked by blocking the TE 20 mode and by setting the insertion length of the metal post inside the waveguide to a length that resonates with the second harmonic. The impedance of the fundamental wave is matched by a total of at least four metal posts at intervals of an odd multiple of about 1/4 of the tube wavelength λg of the fundamental wave. FIG. 4 shows a specific embodiment of the present invention. Since the height of the waveguide is reduced, the height is returned to the original height in step conversion 5 in order to achieve matching. Four metal posts 6 are inserted using screws. In addition, the actual spacing between the screws is 1/1/1 of the fundamental wave wavelength λg due to the influence of the thickness of the screws.
It will be shorter than 4. Furthermore, by increasing the number of screws, broadband characteristics can be obtained. According to the embodiment of the present invention, a low frequency filter that blocks a specific frequency as shown in FIG. 5 can be realized with a simple structure. Also,
By changing the insertion length of the screw and further reducing the height of the waveguide, it is possible to block the third harmonic and other frequencies. (5) Effects of the Invention According to the present invention, a low frequency device with sufficient characteristics can be realized at low cost and can be manufactured by lost waxing or casting.
第１図は、従来の低域波器を示す図、第２図
はTE20モードを示す図、第３図は本発明の原理
を示す図、第４図は本発明の具体例を示す図、第
５図は本発明による構成の特性を示す図である。
図中３11，３12，３21，３22，６１，６２，６
３，６４はネジ、５はステツプ変換部である。
Fig. 1 is a diagram showing a conventional low frequency device, Fig. 2 is a diagram showing TE 20 mode, Fig. 3 is a diagram showing the principle of the present invention, and Fig. 4 is a diagram showing a specific example of the present invention. , FIG. 5 is a diagram showing the characteristics of the configuration according to the invention. In the figure 3 11 , 3 12 , 3 21 , 3 22 , 6 1 , 6 2 , 6
3 , 6 and 4 are screws, and 5 is a step converter.
Claims (1)
導波管の一部の高さを特定の高調波において
TE20モードを除く高次モードが発生しない様な
寸法まで低く該高さを低くした部分に導波管の管
軸に対し直交し且つ平行に第１の金属ポスト群を
設け、更に別の金属ポスト群を基本波の管内波長
の1/4のほぼ奇数倍の間隔で該第１のポスト群と
同様に設けたことを特徴とする低域波器。1 In a low-frequency wave device using a rectangular waveguide, the height of a part of the waveguide is set at a specific harmonic.
A first group of metal posts is provided perpendicularly and parallel to the tube axis of the waveguide in the part whose height is lowered to such a height that high-order modes other than the TE 20 mode will not occur. 1. A low frequency transmitter, characterized in that post groups are provided at intervals of approximately odd multiples of 1/4 of the channel wavelength of the fundamental wave, in the same manner as the first post group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18721582A JPS5985101A (en) | 1982-10-25 | 1982-10-25 | Low pass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18721582A JPS5985101A (en) | 1982-10-25 | 1982-10-25 | Low pass filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5985101A JPS5985101A (en) | 1984-05-17 |
| JPS6258162B2 true JPS6258162B2 (en) | 1987-12-04 |
Family
ID=16202083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18721582A Granted JPS5985101A (en) | 1982-10-25 | 1982-10-25 | Low pass filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5985101A (en) |
-
1982
- 1982-10-25 JP JP18721582A patent/JPS5985101A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5985101A (en) | 1984-05-17 |
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