JPH0630401B2 - Bandpass filter - Google Patents
Bandpass filterInfo
- Publication number
- JPH0630401B2 JPH0630401B2 JP30257786A JP30257786A JPH0630401B2 JP H0630401 B2 JPH0630401 B2 JP H0630401B2 JP 30257786 A JP30257786 A JP 30257786A JP 30257786 A JP30257786 A JP 30257786A JP H0630401 B2 JPH0630401 B2 JP H0630401B2
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- Prior art keywords
- cavity resonator
- cross
- input
- output
- coupling hole
- Prior art date
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Description
【発明の詳細な説明】 ［産業上の利用分野］ この発明は主としてマイクロ波帯及びミリ波帯で使用さ
れる導波管形空胴共振器を用いた帯域通過フィルタに関
するものである。Description: TECHNICAL FIELD The present invention relates to a bandpass filter using a waveguide type cavity resonator mainly used in a microwave band and a millimeter wave band.
［従来の技術］ 第５図は例えばＩＥＥＥ TRANSACTIONS ON MICROWAVE
THEORY AND TECHNIQUES vol.MTT-18,No.12,pp 1109-111
3(DECEMBER,1970)に示された従来の帯域通過フィルタを
示す概略構成図であり、図において(1a)(1b)はTE111モ
ードで共振する円筒形空胴共振器、(2a)(2b)に入出力方
形導波管、(3a)(3b)は入出力結合孔、(4)は十字形結合
孔、(5a)(5b)は直交するモード間の結合量調整ネジ、
(6)は周波数調整ネジである。入出力結合孔(3a)(3b)及
び十字形結合孔(4)はそれぞれ円筒形空胴共振器(1a)(1
b)の両端面に設けられている。周波数調整ネジ(6)は円
筒形空胴共振器(1a)(1b)内の直交する２つのモードの電
界に平行に設けられ、結合量調整ネジ(5a)(5b)は直交す
る２つのモードの電界と45度の角度をなすように設けら
れている。また、図中、矢印は円筒形空胴共振器(1a)(1
b)及び入出力方形導波管(2a)(2b)内の直交する２つのモ
ードの電界の方向を示している。[Prior Art] FIG. 5 shows, for example, IEEE TRANSACTIONS ON MICROWAVE.
THEORY AND TECHNIQUES vol.MTT-18, No.12, pp 1109-111
3 (DECEMBER, 1970) is a schematic configuration diagram showing a conventional bandpass filter, where (1a) and (1b) are cylindrical cavity resonators that resonate in the TE 111 mode, and (2a) and (2b). ) Is an input / output rectangular waveguide, (3a) (3b) is an input / output coupling hole, (4) is a cross coupling hole, (5a) (5b) is a coupling amount adjusting screw between orthogonal modes,
(6) is a frequency adjustment screw. The input / output coupling holes (3a) (3b) and the cross-shaped coupling hole (4) are respectively formed in the cylindrical cavity resonators (1a) (1
It is provided on both ends of b). The frequency adjusting screw (6) is installed parallel to the electric field of two orthogonal modes in the cylindrical cavity resonator (1a) (1b), and the coupling amount adjusting screws (5a) (5b) are two orthogonal modes. It is provided so as to form an angle of 45 degrees with the electric field of. In the figure, the arrow indicates the cylindrical cavity resonator (1a) (1
b) and the directions of electric fields of two orthogonal modes in the input / output rectangular waveguides (2a) and (2b) are shown.
次に動作について説明する。入出力方形導波管(2a)から
入射した幅の広い面に垂直な電界ＥをもつTE10モード波
は、入出力結合孔(3a)を介して円筒形空胴共振器(1a)内
に電界Ａを有するTE11モード波と結合し、TE111モード
で共振する。この電界Ａを有するTE11モード波は45度の
角度をなして設けられた結合量調整ネジ(5a)の効果によ
り、直交する電界Ｂを有するTE11モード波と結合する。
さらに、十字形結合孔(4)を介して直交する電界A,Bを有
するTE11モード波は、それぞれ隣接する円筒形空胴共振
器(1b)内の直交する電界D,Cを有するTE11モード波と結
合し、電界Ｄを有するTE11モード波は入出力結合孔(3b)
を介して入出力方形導波管(2b)の電界ＦをもつTE10モー
ド波と結合し、出力として取り出される。円筒形空胴共
振器(1a)(1b)内の直交するモードが周波数調整ネジ(6)
によって全て同一周波数０で共振するように調整され
ていると前述のように入出力方形導波管(2a)への入射波
は入出力方形導波管(2b)に取り出される。しかし０以
外の周波数では共振器が共振しないため入出力方形導波
管(2a)への入射波はほとんど反射され、入出力方形導波
管(2b)へは出力されない。このように、第５図に示す従
来のフィルタは帯域通過フィルタとして動作し、かつ隣
接する円筒形空胴共振器(1a)(1b)内の電界ＡとＤが逆の
極性を有しているため、第６図に示すような通過域近傍
に減衰極をもつ急峻な減衰特性を示す。また、１つの空
胴共振内の直交する２つのモードを使用しているため物
理的には２個の空胴共振器で４段フィルタとして動作す
るため小形である。Next, the operation will be described. A TE 10 mode wave having an electric field E perpendicular to a wide surface which is incident from the input / output rectangular waveguide (2a) enters the cylindrical cavity resonator (1a) through the input / output coupling hole (3a). It couples with the TE 11 mode wave having the electric field A and resonates in the TE 111 mode. The TE 11 mode wave having the electric field A is coupled with the TE 11 mode wave having the orthogonal electric field B by the effect of the coupling amount adjusting screw (5a) provided at an angle of 45 degrees.
Further, TE 11 TE 11 mode wave having a field A, B perpendicular through the cross coupling hole (4) having respectively orthogonal field D in adjacent cylindrical cavity resonator (1b), a C TE 11 mode wave coupled with mode wave and having electric field D is input / output coupling hole (3b)
Is coupled with the TE 10 mode wave having the electric field F of the input / output rectangular waveguide (2b) via the and output as an output. The orthogonal mode in the cylindrical cavity (1a) (1b) is the frequency adjustment screw (6).
If all are adjusted to resonate at the same frequency 0 , the incident wave to the input / output rectangular waveguide (2a) is extracted to the input / output rectangular waveguide (2b) as described above. However, since the resonator does not resonate at frequencies other than 0 , most of the incident wave to the input / output rectangular waveguide (2a) is reflected and is not output to the input / output rectangular waveguide (2b). Thus, the conventional filter shown in FIG. 5 operates as a bandpass filter, and the electric fields A and D in the adjacent cylindrical cavity resonators (1a) (1b) have opposite polarities. Therefore, it exhibits a steep attenuation characteristic having an attenuation pole near the pass band as shown in FIG. Moreover, since two orthogonal modes in one cavity resonance are used, it is physically small because two cavity resonators physically operate as a four-stage filter.
このフィルタにおいて、結合孔による入出力方形導波管
(2a)(2b)と円筒形空胴共振器(1a)(1b)の結合Ｑｅ（外部
Ｑ）及び円筒空胴共振器(1a)(1b)間の結合ｋ（段間結合
量）は次式で表わされる。In this filter, I / O rectangular waveguide with coupling hole
The coupling Qe (external Q) between (2a) (2b) and the cylindrical cavity resonators (1a) (1b) and the coupling k (inter-stage coupling amount) between the cylindrical cavity resonators (1a) (1b) are It is represented by a formula.
ただし、ｈは入出力方形導波管(2a)(2b)の横断面内の磁
界成分、Ｈは円筒形空胴(1a)(1b)の横断面内の共振磁界
成分、λｇは入出力方形導波管(2a)(2b)にの管内波長、
μは透磁率、Ｍｔは結合孔の周波数特性を考慮した磁気
偏極率である。Ｍｔは結合孔の厚さを無視した場合次式
で表わされる。 Where h is the magnetic field component in the cross section of the input / output rectangular waveguide (2a) (2b), H is the resonant magnetic field component in the cross section of the cylindrical cavity (1a) (1b), and λg is the input / output square. Waveguide wavelength in the waveguide (2a) (2b),
μ is the magnetic permeability, and Mt is the magnetic polarization factor considering the frequency characteristics of the coupling hole. Mt is expressed by the following equation when the thickness of the coupling hole is ignored.
ここで、Ｍ0は結合孔の周波数特性を考慮しない磁気偏
極率、は結合孔の長さ、λは自由空間中の波長であ
る。は通常λ／２より小さな寸法とする。また、空胴
共振器内の共振電磁界は、この空胴共振器内のエネルギ
ーの時間平均値が１となるように規格化されたものであ
る。 Here, M 0 is the magnetic polarization without considering the frequency characteristics of the coupling hole, is the length of the coupling hole, and λ is the wavelength in free space. Is usually smaller than λ / 2. Further, the resonance electromagnetic field in the cavity resonator is standardized so that the time average value of the energy in the cavity resonator becomes 1.
［発明が解決しようとする問題点］ 以上のように構成された従来の帯域通過フィルタは、広
帯域な特性を得るためには結合孔の長さを長くする必要
があった。結合孔の長さを長くすると２と共振周波数
０における自由空間波長λ０に近づくため磁気偏極率
の周波数に対する変化率が大きくなる。第７図はMt/M0
とλ／λ０の関係を示し２／λ０をパラメータとして
示したもので、例えば、λ／λ０＝１においてが大き
くなる程Mt/M0のλ／λ０に対する傾きが大きくなって
いることがわかる。このため、周波数変化によって結合
量が大きく変化するようになる。この結果、従来の帯域
通過フィルタは広帯域な通過帯域において良好なVSWR特
性が得られないという問題点があった。[Problems to be Solved by the Invention] In the conventional bandpass filter configured as described above, it is necessary to increase the length of the coupling hole in order to obtain wide-band characteristics. When the length of the coupling hole is increased, it becomes 2 and the resonance frequency
Since it approaches the free space wavelength λ 0 at 0 , the rate of change of the magnetic polarization rate with respect to the frequency becomes large. Figure 7 shows Mt / M 0
And λ / λ 0 is shown and 2 / λ 0 is used as a parameter. For example, as λ / λ 0 = 1 becomes larger, the slope of Mt / M 0 with respect to λ / λ 0 becomes larger. I understand. For this reason, the amount of coupling greatly changes due to the frequency change. As a result, the conventional bandpass filter has a problem that a good VSWR characteristic cannot be obtained in a wide bandpass band.
この発明は上記のような問題点を解消するためになされ
たもので、小形で広帯域な帯域通過フィルタを得ること
を目的とする。The present invention has been made to solve the above problems, and an object thereof is to obtain a compact and wide band pass filter.
［問題点を解決するための手段］ この発明に係る帯域通過フィルタは、直交する２つのモ
ードが共振する空胴共振器として十字形断面を有する空
胴共振器を用いたものである。[Means for Solving Problems] A bandpass filter according to the present invention uses a cavity resonator having a cross-shaped cross section as a cavity resonator in which two orthogonal modes resonate.
［作用］ この発明においては、円筒形空胴共振器、あるいは正方
形空胴共振器よりも十字形空胴共振器の方が結合孔を設
ける空胴共振器の端面の中央部での電磁界が大きいた
め、結合孔を大きくしなくても円筒形空胴共振器あるい
は正方形空胴共振器よりも大きな結合量が得られ、広帯
域な帯域通過フィルタが得られる。[Operation] In the present invention, the electromagnetic field at the central portion of the end face of the cavity resonator provided with the coupling hole is smaller than that of the cylindrical cavity resonator or the square cavity resonator when the electromagnetic field at the center is provided. Because of the large size, a larger amount of coupling can be obtained than a cylindrical cavity resonator or a square cavity resonator without increasing the size of the coupling hole, and a wideband bandpass filter can be obtained.
［実施例］ 以下、この発明の一実施例を図について説明する。第１
図はこの発明の一実施例を示す概略構成図、第２図は十
字形導波管内の磁界分布を示す図である。[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. First
FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing a magnetic field distribution in a cross waveguide.
第１図において、(2a)(2b)は入出力方形導波管、(3a)(3
b)は入出力結合孔、(4)は十字形結合孔、(5a)(5b)は直
交するモード間の結合量調整ネジ、(6)は周波数調整ネ
ジであり、以上は第５図と同様のものである。(7a)(7b)
はTE101モードで共振する十字形空胴共振器であり、矢
印は十字形空胴共振器(7a)(7b)内及び入出力方形導波管
(2a)(2b)内の電界の方向を示している。十字形空胴共振
器(7a)(7b)には結合量調整ネジ(5a)(5b)及び周波数調整
ネジ(6)が設けられ、結合量調整ネジ(5a)(5b)は十字形
空胴共振器(7a)(7b)の電界と45度の角度をなしている。
この十字形空胴共振器(7a)(7b)は直交する２つのモード
で共振が可能であり、複モード空胴共振器として使用で
きる。In Fig. 1, (2a) and (2b) are input / output rectangular waveguides, and (3a) (3
b) is an input / output coupling hole, (4) is a cross coupling hole, (5a) and (5b) are coupling amount adjusting screws between orthogonal modes, and (6) is a frequency adjusting screw. It is similar. (7a) (7b)
Is a cross-shaped cavity resonator that resonates in TE 101 mode, and the arrows indicate the cross-shaped cavity resonators (7a) and (7b) and the input / output rectangular waveguide.
(2a) shows the direction of the electric field in (2b). The cross-shaped cavity resonators (7a) and (7b) are provided with coupling amount adjusting screws (5a) (5b) and frequency adjusting screw (6). It forms an angle of 45 degrees with the electric field of the resonators (7a) and (7b).
The cross-shaped cavity resonators (7a) and (7b) can resonate in two orthogonal modes and can be used as a multimode cavity resonator.
次にその動作について説明する。入出力導波管(2a)から
入射した電界ＥをもつTE10モード波は入出力結合孔(3a)
を介して十字形空胴共振器(7a)内に電界ＡをもつTE10モ
ード波と結合し、TE101モードで共振する。このTE10モ
ード波は結合量調整ネジ(5a)の効果により直交する電界
ＢをもつTE10モード波と結合し、さらに十字形結合孔
(4)を介して十字形空胴共振器(7a)内のTE10モード波は
十字形空胴共振器(7b)内の電界C,DをもつTE10モード波
と結合する。電界ＤをもつTE10モード波は入出力結合孔
(3b)を介して入出力導波管(2b)のTE10モード波と結合
し、出力として取り出される。十字形空胴共振器(7a)(7
b)内の直交するTE10モード波が全て同一周波数０で共
振するように調整されていると前述のように入出力方形
導波管(2a)への入射波は入出力方形導波管(2b)に取り出
される。しかし、０以外の周波数では共振器が共振し
ないため、入出力方形導波管(2a)への入射波はほとんど
反射され、入出力方形導波管(2b)へは出力されない。こ
のように、この実施例のフィルタは従来の帯域通過フィ
ルタと同様に小形で、通過域近傍に減衰極をもち急峻な
減衰特性を有する帯域通過フィルタとして動作する。Next, the operation will be described. TE 10 mode wave with electric field E incident from the input / output waveguide (2a) is input / output coupling hole (3a)
Through it, it is coupled with the TE 10 mode wave having the electric field A in the cross-shaped cavity resonator (7a) and resonates in the TE 101 mode. This TE 10 mode wave is coupled with the TE 10 mode wave having an electric field B orthogonal to each other due to the effect of the coupling amount adjusting screw (5a), and further the cross-shaped coupling hole
Through (4), the TE 10 mode wave in the cross cavity resonator (7a) is coupled with the TE 10 mode wave having electric fields C and D in the cross cavity resonator (7b). TE 10 mode wave with electric field D is input / output coupling hole
It is coupled with the TE 10 mode wave of the input / output waveguide (2b) via (3b) and taken out as an output. Cruciform cavity resonator (7a) (7
If all of the orthogonal TE 10 mode waves in b) are adjusted to resonate at the same frequency 0 , the incident wave to the input / output rectangular waveguide (2a) is as described above. It is taken out to 2b). However, since the resonator does not resonate at frequencies other than 0 , the incident wave to the input / output rectangular waveguide (2a) is almost reflected and is not output to the input / output rectangular waveguide (2b). As described above, the filter of this embodiment is small like the conventional bandpass filter, and operates as a bandpass filter having an attenuation pole near the passband and having a steep attenuation characteristic.
次に第２図に示す十字形導波管内の電磁界について説明
する。図において矢印は磁界の分布を示しており、断面
内ではそのほとんどが方形断面部ａｂｃｄに集中してい
る。また、十字形空胴共振器(7a)(7b)では円筒形空胴共
振器(1a)(1b)より小さい容積内で共振するため、共振器
内のエネルギーで規格化された磁界Ｈは十字形空胴共振
器(7a)(7b)の方が大きくなる。従って、結合孔(3a)(3b)
及び(4)を十字形空胴共振器(7a)(7b)の両端隔壁中央部
に設ければ、大きな磁界Ｈが得られるため、従来の帯域
通過フィルタと同じ大きさの結合孔を用いてもより大き
な結合量が得られ、広帯域にわたり良好なVSWR特性をも
つ帯域通過フィルタが得られる。Next, the electromagnetic field in the cross-shaped waveguide shown in FIG. 2 will be described. In the figure, arrows indicate the distribution of the magnetic field, and most of them are concentrated in the rectangular cross section abcd in the cross section. In addition, since the cross-shaped cavity resonators (7a) and (7b) resonate in a volume smaller than that of the cylindrical cavity resonators (1a) and (1b), the magnetic field H standardized by the energy in the resonator is sufficient. The character-shaped cavity resonators (7a) and (7b) are larger. Therefore, the coupling holes (3a) (3b)
If (4) and (4) are provided in the center of both ends of the cross-shaped cavity resonators (7a) and (7b), a large magnetic field H can be obtained, so that a coupling hole having the same size as that of the conventional bandpass filter is used. A larger amount of coupling can be obtained, and a bandpass filter having a good VSWR characteristic over a wide band can be obtained.
第３図はこの発明の他の実施例を示す概略構成図で、十
字形空胴共振器(7)と円筒形空胴共振器(1)を組み合わせ
た場合である。この場合も第１図に示す実施例と同様に
入出力導波管(2a)と十字形空胴共振器(7)との間に大き
な結合量が得られるため、入力側と出力側で異なる結合
量を必要とする非対称構造の帯域通過フィルタの広帯域
化を実現することができる。FIG. 3 is a schematic configuration diagram showing another embodiment of the present invention, which is a case where the cross cavity resonator (7) and the cylindrical cavity resonator (1) are combined. Also in this case, a large amount of coupling is obtained between the input / output waveguide (2a) and the cross-shaped cavity resonator (7) as in the embodiment shown in FIG. 1, so that the input side and the output side are different. It is possible to realize a wide band of an asymmetric band-pass filter that requires a coupling amount.
第４図はこの発明のさらに他の実施例を示す概略構成図
で、(8)は正方形空胴共振器である。この場合も第３図
と同様に入力側と出力側で異なる結合量を必要とする非
対称構造の帯域通過フィルタの広帯域化を実現すること
ができる。FIG. 4 is a schematic diagram showing still another embodiment of the present invention, in which (8) is a square cavity resonator. Also in this case, as in the case of FIG. 3, it is possible to realize the band widening of the bandpass filter having an asymmetric structure which requires different coupling amounts on the input side and the output side.
なお、上記実施例では空胴共振器の数が２個の場合につ
いて述べたが、空胴共振器の数が３個以上の場合にも適
用できる。また、十字形空胴共振器がTE101モードで共
振する場合について述べたが、TE10nモード（ｎ＝2,3,
…）で共振する場合にも適用できる。Although the above embodiment has described the case where the number of cavity resonators is two, it can be applied to the case where the number of cavity resonators is three or more. Also, the case where the cross-shaped cavity resonator resonates in the TE 101 mode has been described, but the TE 10n mode (n = 2,3,
It can also be applied when resonating at.
［発明の効果］ 以上のように、この発明によれば直交する２つのモード
で共振する複モード空胴共振器として十字形断面を有す
る空胴共振器を用いたので、より広帯域な帯域通過特性
で急峻な減衰特性をもち、しかも小形な帯域通過フィル
タが得られる効果がある。EFFECTS OF THE INVENTION As described above, according to the present invention, since the cavity resonator having the cross-shaped cross section is used as the multimode cavity resonator that resonates in the two orthogonal modes, the bandpass characteristic of a wider band is obtained. The effect is to obtain a small band pass filter having steep attenuation characteristics.
第１図はこの発明の一実施例を示す概略構成図、第２図
は十字形導波管の磁界分布を示す図、第３図はこの発明
の他の実施例を示す概略構成図、第４図はこの発明のさ
らに他の実施例を示す概略構成図、第５図は従来の帯域
通過フィルタを示す概略構成図、第６図は第５図の帯域
通過フィルタの減衰特性を示す図、第７図は結合孔の磁
気偏極率の周波数特性を示す図である。 図において、(1)(1a)(1b)は円筒形空胴共振器、(2a)(2
b)は入出力方形導波管、(3a)(3b)は入出力結合孔、(4)
は十字形結合孔、(5)は結合量調整用ネジ、(6)は周波数
調整ネジ、(7)(7a)(7b)は十字形空胴共振器、(8)は正方
形空胴共振器である。 なお、図中同一符号は同一或は相当部分を示す。1 is a schematic configuration diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing a magnetic field distribution of a cross-shaped waveguide, and FIG. 3 is a schematic configuration diagram showing another embodiment of the present invention. FIG. 4 is a schematic configuration diagram showing still another embodiment of the present invention, FIG. 5 is a schematic configuration diagram showing a conventional bandpass filter, and FIG. 6 is a diagram showing attenuation characteristics of the bandpass filter of FIG. FIG. 7 is a diagram showing frequency characteristics of magnetic polarization of the coupling hole. In the figure, (1) (1a) (1b) are cylindrical cavity resonators, (2a) (2
b) is an input / output rectangular waveguide, (3a) and (3b) are input / output coupling holes, and (4)
Is a cross-shaped coupling hole, (5) is a screw for adjusting the coupling amount, (6) is a frequency adjusting screw, (7), (7a) and (7b) are cross-shaped cavity resonators, and (8) is a square cavity resonator. Is. In the drawings, the same reference numerals indicate the same or corresponding parts.
Claims (5)
直交する２つのモードで共振する複モード空胴共振器と
を、それらの隔壁の中央部に設けられ、かつ上記入出力
導波管の幅方向に細長の入出力結合孔を介して結合させ
た帯域通過フィルタにおいて、上記複モード空胴共振器
として互に直交する電界を持つ２つのTE10nモード（ｎ
＝1,2,…）で共振する十字形断面を有する空胴共振器を
用いたことを特徴とする帯域通過フィルタ。1. An input / output waveguide for propagating a TE 10 mode wave,
A multi-mode cavity resonator that resonates in two orthogonal modes is coupled to each other through an elongated input / output coupling hole that is provided in the center of the partition wall and that is elongated in the width direction of the input / output waveguide. In the band pass filter, two TE 10n modes (n
= 1,2, ...) A bandpass filter characterized by using a cavity resonator having a cruciform cross section.
結合孔はこの方形導波管の幅広方向に細長の入出力結合
孔で、複モード空胴共振器は上記入出力導波管壁面と平
行な壁面を持つ十字形断面を有する空胴共振器であるこ
とを特徴とする特許請求の範囲第１項記載の帯域通過フ
ィルタ。2. The input / output waveguide is a rectangular waveguide, the input / output coupling hole is an input / output coupling hole elongated in the widthwise direction of the rectangular waveguide, and the multimode cavity resonator is the input / output. The bandpass filter according to claim 1, which is a cavity resonator having a cross-shaped cross section having a wall surface parallel to the waveguide wall surface.
合孔を介して結合した２個の十字形断面を有する空胴共
振器を用いた特許請求の範囲第１項記載の帯域通過フィ
ルタ。3. A bandpass filter according to claim 1, wherein a cavity resonator having two cruciform cross sections coupled through cruciform coupling holes is used as the multimode cavity resonator. .
字形結合孔を介して結合した、十字形断面を有する空胴
共振器と円筒形空胴共振器とを用いた特許請求の範囲第
１項記載の帯域通過フィルタ。4. A multi-mode cavity resonator comprising a cavity resonator having a cross-shaped cross section and a cylindrical cavity resonator which are coupled to each other through a cross-shaped coupling hole. The band pass filter according to item 1.
字形結合孔を介して結合した、十字形断面を有する空胴
共振器と正方形空胴共振器とを用いた特許請求の範囲第
１項記載の帯域通過フィルタ。5. A cavity resonator having a cross-shaped cross section and a square cavity resonator, which are coupled to each other through a cross-shaped coupling hole, as the multimode cavity resonator. The band pass filter according to item.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30257786A JPH0630401B2 (en) | 1986-12-18 | 1986-12-18 | Bandpass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30257786A JPH0630401B2 (en) | 1986-12-18 | 1986-12-18 | Bandpass filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63155803A JPS63155803A (en) | 1988-06-29 |
| JPH0630401B2 true JPH0630401B2 (en) | 1994-04-20 |
Family
ID=17910653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30257786A Expired - Lifetime JPH0630401B2 (en) | 1986-12-18 | 1986-12-18 | Bandpass filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0630401B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AUPP747098A0 (en) * | 1998-12-04 | 1998-12-24 | Alcatel | Waveguide directional filter |
| CN103326098B (en) * | 2013-07-06 | 2016-03-30 | 中国科学技术大学 | A kind of bimodulus polarization cavity with adjustable coupling hole |
-
1986
- 1986-12-18 JP JP30257786A patent/JPH0630401B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63155803A (en) | 1988-06-29 |
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