JPH0671165B2 - Dielectric filter - Google Patents
Dielectric filterInfo
- Publication number
- JPH0671165B2 JPH0671165B2 JP61236404A JP23640486A JPH0671165B2 JP H0671165 B2 JPH0671165 B2 JP H0671165B2 JP 61236404 A JP61236404 A JP 61236404A JP 23640486 A JP23640486 A JP 23640486A JP H0671165 B2 JPH0671165 B2 JP H0671165B2
- Authority
- JP
- Japan
- Prior art keywords
- conductor
- inner conductor
- dielectric block
- dielectric
- input
- 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.)
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Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は比較的高周波帯、特にVHF帯、UHF帯およびマ
イクロ波帯で多く用いられる誘電体フィルタに関するも
のである。DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a dielectric filter often used in a relatively high frequency band, particularly in a VHF band, a UHF band and a microwave band.
第７図は例えば特開昭55−143801号に示された従来の誘
電体フィルタの概略構成を示す図で、同図（ａ）は一部
欠載した平面図、同図（ｂ）は縦断正面図である。図に
おいて1,2は外導体、３は内導体、４は周波数調整ネ
ジ、５は誘電体、６は入出力ループ、P1,P2は入出力端
子である。FIG. 7 is a diagram showing a schematic structure of a conventional dielectric filter disclosed in, for example, Japanese Patent Laid-Open No. 55-143801. FIG. 7 (a) is a partially cutaway plan view, and FIG. 7 (b) is a vertical section. It is a front view. In the figure, 1 and 2 are outer conductors, 3 is an inner conductor, 4 is a frequency adjusting screw, 5 is a dielectric, 6 is an input / output loop, and P 1 and P 2 are input / output terminals.
内導体３は一端が外導体１に接続されて短絡端となり、
他端は開放端となっており、周波数調整ネジ４によって
容量負荷が設けられている。静電容量の効果によって内
導体３の長さは1/4波長以下になっているので、内導体
３は主として磁界結合によって相互に結合している。結
合量は２つの内導体３間の距離によって調整される。
又、入出力ループ６は内導体３に平行して近接配置され
ており、その平行配置された区間の長さが1/4波長以下
であるのでその結合も主として磁界による結合となる。One end of the inner conductor 3 is connected to the outer conductor 1 to form a short-circuited end,
The other end is an open end, and a capacitive load is provided by the frequency adjusting screw 4. Since the length of the inner conductor 3 is not more than 1/4 wavelength due to the effect of electrostatic capacitance, the inner conductors 3 are mainly coupled to each other by magnetic field coupling. The amount of coupling is adjusted by the distance between the two inner conductors 3.
Further, since the input / output loop 6 is arranged in parallel with and close to the inner conductor 3 and the length of the section arranged in parallel is 1/4 wavelength or less, the coupling is mainly magnetic field coupling.
次に動作について説明する。今、内導体３の長さを調整
することによって全ての内導体３が同一周波数f0で共振
するものとすれば、周波数f0では共振状態にある内導体
３に相互に強く結合するとともに入出力ループ６とも強
く結合し、入出力端子P1への入射波は入出力端子P2に導
かれる。しかし、周波数f0以外の周波数では、内導体３
は相互の結合及び入出力ループ６との結合が非常に弱
く、入出力端子P1あるいはP2への入射波はほとんどの電
力が反射される。このように、第７図に示した従来の誘
電体フィルタは帯域通過フィルタとしての機能を有す
る。Next, the operation will be described. Now, assuming that all the inner conductors 3 resonate at the same frequency f 0 by adjusting the length of the inner conductors 3, the inner conductors 3 that are in resonance at the frequency f 0 are strongly coupled to each other and input. It is also strongly coupled to the output loop 6, and the incident wave to the input / output terminal P 1 is guided to the input / output terminal P 2 . However, at frequencies other than the frequency f 0 , the inner conductor 3
Are very weakly coupled to each other and to the input / output loop 6, and most of the electric power of the incident wave to the input / output terminal P 1 or P 2 is reflected. Thus, the conventional dielectric filter shown in FIG. 7 has a function as a bandpass filter.
従来の誘電体フィルタは以上のように構成されているの
で、誘電体５として比誘電率の大きい誘電体を用い、周
波数調整ネジ４による容量負荷を設けることによって小
形化を図っても、機械的に安定した構成とし、周波数調
整ネジを取付けるためには、外導体1,2に所定の肉厚が
必要であり、小形化にはおのずと限度があり、また、外
導体1,2、内導体３、周波数調整ネジ４、誘電体５等の
個別の部品を組み立てて製造するものであるため、部品
数が多く製造組立作業が煩雑になるばかりか、外導体1,
2および内導体３と誘電体５の線膨張係数の差によっ
て、温度変化が生じると共振周波数が変化するなどの問
題点があった。Since the conventional dielectric filter is configured as described above, a dielectric having a large relative permittivity is used as the dielectric 5 and a mechanical load can be achieved even if the capacitive load is provided by the frequency adjusting screw 4 even if the size is reduced. The outer conductors 1 and 2 must have a certain thickness in order to have a stable structure in order to mount the frequency adjustment screw, and there is a limit to downsizing. In addition, the outer conductors 1 and 2 and the inner conductor 3 , The frequency adjusting screw 4, the dielectric 5 and other individual parts are assembled and manufactured, the number of parts is large and the manufacturing and assembling work is complicated.
2 and the difference in the linear expansion coefficient between the inner conductor 3 and the dielectric 5 causes a problem that the resonance frequency changes when the temperature changes.
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、部品数が少なく、製作が容易で、小形化で
き、さらに、温度変化にも安定な誘電体フィルタを得る
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 dielectric filter having a small number of parts, easy to manufacture, miniaturized, and stable even against temperature changes. To do.
この発明に係る誘電体フィルタは、外導体を誘電体ブロ
ック表面に密着した導体膜で形成し、内導体を誘電体ブ
ロックに所定間隔であけられた貫通孔の内周面に密着
し、一端で前記外導体と継目なく接続された導体膜で形
成するとともに、誘電体ブロックの内導体開放端側の側
面の各内導体相互間に導体膜を有する容量負荷形成溝を
設け、さらに、前記誘電体ブロックに、内導体の開放端
から内導体の全長の約1/3の位置に、内導体の軸方向と
直角となる方向に減衰特性変換溝を設けたものである。In the dielectric filter according to the present invention, the outer conductor is formed of a conductive film that is in close contact with the surface of the dielectric block, and the inner conductor is in close contact with the inner peripheral surface of the through holes that are formed at predetermined intervals in the dielectric block, and at one end A capacitive load forming groove is formed which is formed of a conductor film seamlessly connected to the outer conductor, and has a conductor film between the inner conductors on the side surface of the dielectric block on the open end side of the inner conductor. The block is provided with a damping characteristic conversion groove at a position approximately 1/3 of the entire length of the inner conductor from the open end of the inner conductor in a direction perpendicular to the axial direction of the inner conductor.
［作用］ この発明における誘電体フィルタは、誘電体ブロックと
これに密着した導体膜とで形成することで、部品数を減
少させて製造組立を容易化するとともに、誘電体ブロッ
クに比誘電率の大きな材料を用いて波長を短縮してやる
だけで、他にはほとんど制約を受けることなく小型化を
可能とし、かつ、導体膜を誘電体ブロックに密着させ
て、従来の誘電体フィルタのような導体と誘電体との間
の隙間の影響を除くとともに、その線膨張係数が銅，ア
ルミニウム等の良導電性金属のものより小さい誘電体の
線膨張係数で決まるようにすることで、良好な温度特性
を実現する。また、誘電体ブロックに、内導体の開放端
側から内導体の全長の約1/3の位置に、内導体の軸方向
と直角となる方向に減衰特性変換溝を設けることによ
り、３倍高調波の共振周波数は変化しないが、基本波の
共振周波数が低下し、したがって、基本波と３倍高調波
の間隔を広くとれる。[Operation] The dielectric filter according to the present invention is formed of the dielectric block and the conductive film in close contact with the dielectric block, thereby reducing the number of parts and facilitating the manufacturing and assembling. Just by using a large material and shortening the wavelength, it is possible to achieve miniaturization with almost no other restrictions, and by sticking the conductor film to the dielectric block, it becomes possible to use a conductor like a conventional dielectric filter. By eliminating the effect of the gap between the dielectric and the coefficient of linear expansion of which is smaller than that of a good conductive metal such as copper or aluminum, a good temperature characteristic can be obtained. To be realized. Also, by providing a damping characteristic conversion groove in the dielectric block at a position that is approximately 1/3 of the total length of the inner conductor from the open end side of the inner conductor, a damping characteristic conversion groove is formed in a direction perpendicular to the axial direction of the inner conductor. Although the resonance frequency of the wave does not change, the resonance frequency of the fundamental wave is lowered, so that the interval between the fundamental wave and the triple harmonic can be widened.
［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による誘電体フィルタの概略構
成を示す斜視図、第２図（ａ）はそのＡ−Ａ線断面図、
同図（ｂ）はその内導体に沿った電位分布を示す線図で
あり、第３図は第１図に示す誘電体フィルタの通過特性
を示す線図である。第１図において、10は外導体、30は
内導体、50は誘電体ブロック、6a,6bは入出力内導体、
７は容量負荷形成溝（第１の溝）、70は減衰特性変換溝
（第２の溝）である。[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. First
FIG. 1 is a perspective view showing a schematic structure of a dielectric filter according to an embodiment of the present invention, FIG. 2 (a) is a sectional view taken along the line AA,
FIG. 3B is a diagram showing the potential distribution along the inner conductor, and FIG. 3 is a diagram showing the pass characteristics of the dielectric filter shown in FIG. In FIG. 1, 10 is an outer conductor, 30 is an inner conductor, 50 is a dielectric block, 6a and 6b are input / output inner conductors,
Reference numeral 7 is a capacitive load forming groove (first groove), and 70 is a damping characteristic conversion groove (second groove).
外導体10は誘電体ブロック50の表面に密着して配置され
た導体膜によって形成されており、内導体30は、誘電体
ブロック50の一側面に所定間隔ずつ離して設けられた長
さがほぼ1/4波長の複数個の貫通孔の内周面に密着して
配置された導体膜によって形成され、一端が前記外導体
10に継目なく接続されて短絡端となり、他端が開放端と
なっている。誘電体ブロック50の前記内導体30の開放端
側側面の各内導体30の相互間には導体膜が密着して配さ
れた容量負荷形成溝７が設けられ、容量負荷が実現され
ている。容量負荷形成溝７の効果によって隣接する内導
体30の相互に結合する部分の長さは1/4波長より短くな
っているので、内導体30は主として磁界により結合して
いる。そしてその結合量は内導体30の間隔及び主として
容量負荷形成溝７の深さによって調整できる。The outer conductor 10 is formed of a conductor film that is disposed in close contact with the surface of the dielectric block 50, and the inner conductor 30 is provided on one side surface of the dielectric block 50 at a predetermined interval and has a length of approximately the same. The outer conductor is formed by a conductor film closely attached to the inner peripheral surfaces of a plurality of quarter-wavelength through holes.
10 is connected seamlessly to form a short-circuited end and the other end is an open end. Between the inner conductors 30 on the side of the inner conductor 30 of the dielectric block 50 on the open end side, a capacitance load forming groove 7 in which a conductor film is closely attached is provided to realize a capacitance load. Due to the effect of the capacitive load forming groove 7, the length of the portion where the adjacent inner conductors 30 are coupled to each other is shorter than 1/4 wavelength, so that the inner conductors 30 are coupled mainly by the magnetic field. The coupling amount can be adjusted by the distance between the inner conductors 30 and mainly the depth of the capacitive load forming groove 7.
入出力内導体6a,6bは導体膜で形成されて外導体10とは
絶縁されており、それぞれ両端の内導体30に接続され
て、当該内導体30に流れる電流の一部を分流する形式の
入出力結合回路を形成している。第２の溝70は誘電体ブ
ロック50の上面と下面、即ち、内導体30の配列方向に平
行な面のそれぞれに、内導体30の短絡端側から内導体30
の全長の約1/3の位置に、各内導体30と直角となる方向
に設けられ、外導体10と継目なく接続された導体膜が密
着して配されている。The input / output inner conductors 6a and 6b are formed of a conductor film and are insulated from the outer conductor 10, and are connected to the inner conductors 30 at both ends, respectively, and divide a part of the current flowing through the inner conductor 30. It forms an input / output coupling circuit. The second groove 70 is formed on each of the upper surface and the lower surface of the dielectric block 50, that is, the surface parallel to the arrangement direction of the inner conductors 30 from the short-circuited end side of the inner conductors 30.
A conductor film, which is provided at a position of about 1/3 of the entire length of, in a direction perpendicular to each inner conductor 30, and which is seamlessly connected to the outer conductor 10, is arranged.
次に動作について説明する。今、内導体30の長さを調整
することによって全ての内導体30が同一周波数f0で共振
するものとすれば、周波数f0では共振状態にある内導体
30は相互に強く結合するとともに、入出力内導体6a,6b
とも強く結合し、入出力内導体6aに接続される入出力端
子への入射波は入出力内導体6bに接続される入出力端子
に導かれる。しかし、周波数f0以外の周波数では内導体
30は相互の結合及び入出力内導体6a,6bとの結合が非常
に弱く、入出力内導体6a,6bに接続される入出力端子へ
の入射波はほとんどの電力が反射される。このように、
この実施例の誘電体フィルタは帯域通過フィルタとして
の機能を有する。Next, the operation will be described. Now, assuming that all the inner conductors 30 resonate at the same frequency f 0 by adjusting the length of the inner conductor 30, the inner conductors that are in resonance at the frequency f 0.
30 is strongly coupled to each other, and the input / output inner conductors 6a, 6b
The incident wave to the input / output terminal connected to the input / output inner conductor 6a is guided to the input / output terminal connected to the input / output inner conductor 6b. However, at frequencies other than frequency f 0 , the inner conductor
Mutual coupling of 30 and coupling with the input / output inner conductors 6a, 6b is very weak, and most of the power of the incident wave to the input / output terminal connected to the input / output inner conductors 6a, 6b is reflected. in this way,
The dielectric filter of this embodiment has a function as a bandpass filter.
ここで、第２の溝70がない場合は第２図（ｂ）に破線で
示すように、同一共振器に対し基本波だけでなく３倍高
調波も共振し、通過してしまうという問題点があるが、
本実施例の如く、減衰特性変換溝70が３倍高調波の電位
が最大となる位置の近傍、即ち、内導体30の短絡端側か
ら内導体30の約1/3の位置に設けられた場合は、減衰特
性変換溝70と内導体30の間に生じる静電容量による共振
周波数の低下は基本波よりも３倍高調波の方が大きくな
り、従って、第３図の通過特性に示すように、３倍高調
波の通過域が3f0よりも下がり、基本波の３倍の周波数
においても減衰量を得ることができる。Here, in the case where the second groove 70 is not provided, as shown by the broken line in FIG. 2B, not only the fundamental wave but also the third harmonic wave resonates with the same resonator, causing a problem. But there is
As in the present embodiment, the attenuation characteristic conversion groove 70 is provided in the vicinity of the position where the potential of the third harmonic is maximum, that is, at a position of about 1/3 of the inner conductor 30 from the short-circuited end side of the inner conductor 30. In this case, the decrease in the resonance frequency due to the capacitance generated between the attenuation characteristic conversion groove 70 and the inner conductor 30 is larger in the triple harmonic than in the fundamental wave. Therefore, as shown in the pass characteristic of FIG. In addition, the passband of the triple harmonic is lower than 3f 0 , and the attenuation amount can be obtained even at the frequency of triple the fundamental wave.
また、この減衰特性変換溝70は、必ずしも誘電体ブロッ
ク50の上下両面に設けなくとも、上面あるいは下面の一
方に設けるだけであってもよい。Further, the attenuation characteristic conversion groove 70 does not necessarily have to be provided on both upper and lower surfaces of the dielectric block 50, but may be provided only on one of the upper surface and the lower surface.
第４図はこの発明の他の実施例による誘電体フィルタを
示す斜視図で、減衰特性変換溝70を内導体30の開放端側
から内導体30の全長の約1/3の位置に設けている点で第
１図に示す実施例とは異なっている。この場合、第５図
（ｂ）に示すように減衰特性変換溝70は３倍高調波の電
位が零となる位置の近傍に設けられているため、溝70と
内導体30の間の静電容量は３倍高調波にほとんど影響を
与えず、基本波の共振周波数だけを低下させる。従っ
て、通過特性は第６図に実線で示すように３倍高調波の
通過域は変化せず、基本波の通過域のみ下がる。第４図
に破線で示すように、基本波の通過域を所定の周波数に
調整した場合、基本波と３倍高調波の通過域の間隔は変
化しないため、基本波の３倍の周波数においても減衰量
を得ることができる。FIG. 4 is a perspective view showing a dielectric filter according to another embodiment of the present invention, in which an attenuation characteristic conversion groove 70 is provided at a position of about 1/3 of the total length of the inner conductor 30 from the open end side of the inner conductor 30. 1 is different from the embodiment shown in FIG. In this case, as shown in FIG. 5 (b), the attenuation characteristic conversion groove 70 is provided in the vicinity of the position where the potential of the third harmonic wave becomes zero, so that the electrostatic capacitance between the groove 70 and the inner conductor 30 is reduced. The capacitance has almost no effect on the third harmonic, and lowers only the resonance frequency of the fundamental wave. Therefore, as shown by the solid line in FIG. 6, the pass characteristic does not change the pass band of the triple harmonic, but only the pass band of the fundamental wave decreases. As shown by the broken line in FIG. 4, when the passband of the fundamental wave is adjusted to a predetermined frequency, the interval between the passband of the fundamental wave and the triple harmonic wave does not change, so even at the frequency three times the fundamental wave. The amount of attenuation can be obtained.
なお、上記実施例では内導体の数が３本の場合について
述べたが、内導体の数が２本の場合及び４本以上の場合
にも適用することができる。また、入出力結合回路を内
導体に流れる電流を分流する形式のものについて述べた
が、磁界による結合あるいは静電容量による結合を用い
てもよく、上記実施例と同等の効果を奏する。Although the above embodiment has described the case where the number of inner conductors is three, the present invention can be applied to the case where the number of inner conductors is two and the number of inner conductors is four or more. Also, although the input / output coupling circuit is of a type in which the current flowing in the inner conductor is shunted, coupling by a magnetic field or coupling by an electrostatic capacitance may be used, and the same effect as that of the above embodiment is obtained.
以上のように、この発明によれば、外導体及び内導体を
誘電体ブロックの表面あるいは貫通孔の内周面に密着し
た導体膜で形成し、内導体間に導体膜が密着して配され
た第１の溝を設け、さらに、前記誘電体ブロックに、内
導体の開放端から内導体の全長の約1/3の位置に、内導
体の軸方向と直角となる方向に減衰特性変換溝を設けた
構成としたので、外導体、内導体が極めて薄形化され、
比誘電率の大きな誘電体ブロックを用いれば他にはほと
んど制約を受けることなく小形化することが可能とな
り、また、誘電体ブロックとこれに密着した導体膜とで
形成されているため、部品数が少なく製造組立が容易と
なるばかりか、その線膨張係数は良導電性金属よりも小
さな誘電体ブロックのそれで決定され、さらに従来の誘
電体フィルタの如く導体と誘電体との間の隙間の影響も
なく、極めて良好な温度特性が得られる。さらに内導体
の開放端から内導体の全長の約1/3の位置に減衰特性変
換溝を設けたことにより、３倍高調波の共振周波数は変
化しないが、基本波の共振周波数が低下し、したがっ
て、基本波と３倍高調波の間隔を広くとれる効果があ
る。As described above, according to the present invention, the outer conductor and the inner conductor are formed of the conductor film that is in close contact with the surface of the dielectric block or the inner peripheral surface of the through hole, and the conductor film is arranged in close contact with the inner conductor. A first groove, and further, in the dielectric block, at a position approximately 1/3 of the total length of the inner conductor from the open end of the inner conductor, a damping characteristic conversion groove is formed in a direction perpendicular to the axial direction of the inner conductor. The outer conductor and the inner conductor are extremely thin,
If a dielectric block with a large relative permittivity is used, it can be miniaturized with almost no other restrictions, and since it is composed of the dielectric block and the conductor film that adheres to it, the number of parts is reduced. The coefficient of linear expansion is determined by that of a dielectric block that is smaller than a good conductive metal, and the effect of the gap between the conductor and the dielectric is the same as that of a conventional dielectric filter. In addition, extremely good temperature characteristics can be obtained. Furthermore, by providing an attenuation characteristic conversion groove from the open end of the inner conductor to the position of about 1/3 of the total length of the inner conductor, the resonance frequency of the triple harmonic does not change, but the resonance frequency of the fundamental wave decreases. Therefore, there is an effect that the interval between the fundamental wave and the triple harmonic can be widened.
第１図はこの発明の一実施例による誘電体フィルタを示
す斜視図、第２図（ａ）は第１図のＡ−Ａ線断面図、第
２図（ｂ）は第２図（ａ）で示した内導体に沿った電位
分布を示す線図、第３図は同通過特性を示す線図、第４
図はこの発明による誘電体フィルタを示す斜視図、第５
図（ａ）は第４図のＡ−Ａ線断面図、第５図（ｂ）は第
５図（ａ）で示した内導体に沿った電位分布を示す線
図、第６図はその通過特性を示す線図、第７図（ａ）は
従来の誘電体フィルタの概略構成を示す一部欠載の平面
図、第７図（ｂ）は同縦断面図である。 6a,6bは入出力内導体（入出力結合回路）、７は容量負
荷形成溝（第１の溝）、10は外導体、30は内導体、50は
誘電体ブロック、70は減衰特性変換溝（第２の溝）。 なお、図中、同一付号は同一、又は相当部分を示す。1 is a perspective view showing a dielectric filter according to an embodiment of the present invention, FIG. 2 (a) is a sectional view taken along the line AA of FIG. 1, and FIG. 2 (b) is FIG. 2 (a). Fig. 3 is a diagram showing the potential distribution along the inner conductor shown in Fig. 3, Fig. 3 is a diagram showing the same passage characteristics, and Fig. 4
FIG. 5 is a perspective view showing a dielectric filter according to the present invention.
4A is a sectional view taken along the line AA of FIG. 4, FIG. 5B is a diagram showing the potential distribution along the inner conductor shown in FIG. 5A, and FIG. 6 is its passage. A characteristic diagram, FIG. 7 (a) is a partially cutaway plan view showing a schematic configuration of a conventional dielectric filter, and FIG. 7 (b) is a longitudinal sectional view thereof. 6a and 6b are input / output inner conductors (input / output coupling circuit), 7 is a capacitive load forming groove (first groove), 10 is an outer conductor, 30 is an inner conductor, 50 is a dielectric block, and 70 is an attenuation characteristic conversion groove. (Second groove). In the drawings, the same reference numerals indicate the same or corresponding parts.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 武田 文雄 神奈川県鎌倉市大船５丁目１番１号 三菱 電機株式会社情報電子研究所内 (56)参考文献 特開 昭62−85502（ＪＰ，Ａ) 特開 昭59−117302（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Fumio Takeda 5-1-1, Ofuna, Kamakura-shi, Kanagawa Mitsubishi Electric Corporation Information Electronics Laboratory (56) Reference Japanese Patent Laid-Open No. 62-85502 (JP, A) Kai 59-117302 (JP, A)
Claims (1)
定の間隔で複数個あけられた誘電体ブロックと、前記各
貫通孔の内周面に密着して配置された導体膜で形成され
る複数の内導体と、前記誘電体ブロックの表面に密着し
て配置された導体膜で形成され、前記各内導体の一方の
端部が継目なく接続されている外導体と、前記誘電体ブ
ロックの前記内導体開放端側の側面の前記各内導体相互
の間に設けられ、前記外導体と継目なく接続された導体
膜を有する容量負荷形成溝と、入出力結合回路と、前記
誘電体ブロックに、前記内導体の配列方向と平行な上面
及び下面の少なくとも一方の前記内導体の開放端から前
記内導体の全長の約1/3の位置に、前記内導体の軸方向
と直角となる方向に設けられ、前記外導体と継目なく接
続された導体膜が密着して配置された減衰特性変換溝と
を備えた誘電体フィルタ。1. A dielectric block having a plurality of through holes penetrating from one side surface to the back surface thereof at a predetermined interval, and a conductor film disposed in close contact with the inner peripheral surface of each of the through holes. A plurality of inner conductors, and an outer conductor formed by a conductor film closely attached to the surface of the dielectric block, wherein one end of each inner conductor is seamlessly connected, and the dielectric block. A capacitive load forming groove having a conductor film which is provided between the inner conductors on the side surface of the inner conductor open end side and which is seamlessly connected to the outer conductor, an input / output coupling circuit, and the dielectric block. In the direction perpendicular to the axial direction of the inner conductor, at a position approximately 1/3 of the total length of the inner conductor from the open end of the inner conductor on at least one of the upper surface and the lower surface parallel to the arrangement direction of the inner conductor. , The conductor film that is seamlessly connected to the outer conductor is Dielectric filter and a to place attenuation characteristic conversion groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61236404A JPH0671165B2 (en) | 1986-10-02 | 1986-10-02 | Dielectric filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61236404A JPH0671165B2 (en) | 1986-10-02 | 1986-10-02 | Dielectric filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6390203A JPS6390203A (en) | 1988-04-21 |
| JPH0671165B2 true JPH0671165B2 (en) | 1994-09-07 |
Family
ID=17000253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61236404A Expired - Fee Related JPH0671165B2 (en) | 1986-10-02 | 1986-10-02 | Dielectric filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0671165B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01126705U (en) * | 1988-02-22 | 1989-08-30 | ||
| JP2667604B2 (en) * | 1991-11-14 | 1997-10-27 | 三菱電機株式会社 | Stripline filter |
| US5896074A (en) * | 1992-01-22 | 1999-04-20 | Murata Manufacturing Co., Ltd. | Dielectric filter |
| JPH07106805A (en) * | 1993-10-06 | 1995-04-21 | Murata Mfg Co Ltd | Dielectric resonator |
| JP3570397B2 (en) * | 2001-06-20 | 2004-09-29 | 株式会社村田製作所 | Dielectric filter, dielectric duplexer and communication device |
| JP2006340043A (en) * | 2005-06-02 | 2006-12-14 | Furuno Electric Co Ltd | Coaxial filter, duplexer, and manufacturing method of coaxial filter |
| CN106785262B (en) * | 2017-01-18 | 2021-03-12 | 苏州富电通讯有限公司 | Medium interdigital filter |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6065601A (en) * | 1983-09-21 | 1985-04-15 | Oki Electric Ind Co Ltd | Dielectric filter |
| JPS6152003A (en) * | 1984-08-21 | 1986-03-14 | Murata Mfg Co Ltd | Dielectric filter |
| JPS61161806A (en) * | 1985-01-11 | 1986-07-22 | Mitsubishi Electric Corp | High frequency filter |
| JPS6285502A (en) * | 1985-10-11 | 1987-04-20 | Fujitsu Ltd | Dielectric filter |
-
1986
- 1986-10-02 JP JP61236404A patent/JPH0671165B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6390203A (en) | 1988-04-21 |
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| LAPS | Cancellation because of no payment of annual fees |