JPH06204704A - Dielectric filter and its manufacture - Google Patents

Abstract

PURPOSE:To obtain weak coupling without extending the interval between resonators. CONSTITUTION:A dielectric board 5 is provided between at least resonators 21 and 22 located side by side. The dielectric filter is realized in which the strength of the coupling between the resonators 21 and 22 is adjusted by selecting the thickness of the dielectric board 5 as the feature. Or the dielectric filter is realized in which the strength of the coupling between the resonators 21 and 22 is adjusted by selecting the dielectric constant of the dielectric board 5 as the feature. The resonators 21, 22 and the dielectric board 5 are formed by eliminating part of dielectric members 11, 12.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、中心周波数が数１００
ＭＨｚから数ＧＨｚのフィルタのうち、特に移動体通信
等に利用され、狭帯域特性に適する誘電体フィルタに関
する。BACKGROUND OF THE INVENTION The present invention has a center frequency of several hundreds.
Among the filters of MHz to several GHz, the present invention relates to a dielectric filter which is used especially for mobile communication and suitable for a narrow band characteristic.

【０００２】[0002]

【従来の技術】図３は従来の誘電体フィルタの構造を説
明する分解斜視図である。図３に示す誘電体フィルタで
は第１の共振器２１及び第２の共振器２２のみを用いた
場合の例を示している。第１の共振器２１は一対の四角
柱形を呈する板状の誘電体２１ａ，２１ｂの中間に導体
板２４を挾み、一対の誘電体２１ａ，２１ｂがはんだ付
け等の結合手段によって重ね合わせられている。第２の
共振器２２は、一対の四角柱形を呈する誘電体２２ａ，
２２ｂの中間に導体板２５を挾み、一対の誘電体２２
ａ，２２ｂがはんだ付け等の結合手段によって重ね合わ
せられている。第１及び第２の共振器２１，２２の長手
方向を直交する一端面Ａ，一端面Ｂはそれぞれ短絡され
ている。即ち、第１の共振器２１では紙面の右側（後
面）の一端面Ａで短絡されており、第２の共振器２２で
は紙面の左側（前面）の一端面Ｂで短絡されている。第
１及び第２の共振器２１，２２の長手方向における長さ
寸法Ｌは、誘電体フィルタの中心周波数が１／４波長と
なるように選定されている。これ等の第１及び第２の共
振器２１，２２の長手方向の側面には電極は存在しな
い。2. Description of the Related Art FIG. 3 is an exploded perspective view for explaining the structure of a conventional dielectric filter. The dielectric filter shown in FIG. 3 shows an example in which only the first resonator 21 and the second resonator 22 are used. In the first resonator 21, a conductor plate 24 is sandwiched between a pair of rectangular prism-shaped plate-shaped dielectrics 21a and 21b, and the pair of dielectrics 21a and 21b are superposed by a coupling means such as soldering. ing. The second resonator 22 includes a pair of rectangular prism-shaped dielectrics 22a,
A conductor plate 25 is sandwiched between the pair of dielectrics 22b and 22b.
a and 22b are superposed by a connecting means such as soldering. One end face A and one end face B of the first and second resonators 21 and 22 orthogonal to the longitudinal direction are short-circuited, respectively. That is, the first resonator 21 is short-circuited at one end surface A on the right side (rear surface) of the paper, and the second resonator 22 is short-circuited at one end surface B on the left side (front surface) of the paper. The length dimension L in the longitudinal direction of the first and second resonators 21 and 22 is selected so that the center frequency of the dielectric filter is ¼ wavelength. No electrodes are present on the longitudinal side surfaces of these first and second resonators 21 and 22.

【０００３】また、第１及び第２の共振器２１，２２に
は各々入出力用の静電結合用誘電体２６，２７が接続さ
れている。さらに静電結合用誘電体２６，２７の外側に
は静電結合用導体３０，３１が取り付けられている。こ
れら第１及び第２の共振器２１，２２の外側には２枚の
接地導体板５１，５２が第１及び第２の共振器２１，２
２全体を覆うような形で互いに結合される。Input / output electrostatic coupling dielectrics 26 and 27 are connected to the first and second resonators 21 and 22, respectively. Further, electrostatic coupling conductors 30 and 31 are attached to the outside of the electrostatic coupling dielectrics 26 and 27. Two ground conductor plates 51 and 52 are provided outside the first and second resonators 21 and 22, respectively.
The two are bonded together so as to cover them all.

【０００４】図４は、第１及び第２の共振器２１，２２
を接地導体板５１，５２に接合した状態を、第２の共振
器２２の一端面Ｂ方向を前面として見た図である。図４
において、第１及び第２の共振器２１，２２の隣接側面
間は第１及び第２の共振器２１，２２から漏れ出した電
磁界が相互に干渉し合うので、相互に結合を持ってい
る。またこれらの第１及び第２の共振器２１，２２は静
電結合用誘電体２６，２７および静電結合用導体３０，
３１を介して入力端子３６，出力端子３７に結合されて
いるので、全体として入力及び出力端子３６，３７の間
では第１及び第２の共振器２１，２２の共振周波数の近
傍を通過帯域とするフィルタが構成できる。第１及び第
２の共振器２１，２２間の結合の強さは第１及び第２の
共振器２１，２２間の間隔ｄに反比例するので、第１及
び第２の共振器２１，２２間の間隔ｄを狭くすればフィ
ルタとしての帯域幅は広くなる。また、間隔ｄを広くす
れば帯域幅は狭くなる。ここで、図３及び図４のおい
て、間隔ｄ方向における第１及び第２の共振器２１，２
２の幅をＷで示している。FIG. 4 shows the first and second resonators 21 and 22.
FIG. 6 is a diagram showing a state in which is connected to the ground conductor plates 51 and 52, with the one end surface B direction of the second resonator 22 as a front surface. Figure 4
In, the electromagnetic fields leaking from the first and second resonators 21 and 22 interfere with each other between the adjacent side surfaces of the first and second resonators 21 and 22, and thus have mutual coupling. . The first and second resonators 21 and 22 are composed of electrostatic coupling dielectrics 26 and 27 and electrostatic coupling conductors 30,
Since it is coupled to the input terminal 36 and the output terminal 37 via 31, the vicinity of the resonance frequencies of the first and second resonators 21 and 22 is a pass band between the input and output terminals 36 and 37 as a whole. A filter can be configured. Since the strength of the coupling between the first and second resonators 21 and 22 is inversely proportional to the distance d between the first and second resonators 21 and 22, there is a difference between the first and second resonators 21 and 22. The bandwidth of the filter becomes wider by narrowing the interval d. Further, if the distance d is widened, the bandwidth becomes narrower. Here, in FIGS. 3 and 4, the first and second resonators 21 and 2 in the direction of the distance d are shown.
The width of 2 is indicated by W.

【０００５】[0005]

【発明が解決しようとする課題】一般に、誘電体フィル
タに要請される帯域幅はシステムの要求から決まってく
る。フィルタ技術としてはできるだけ広い要求に応じら
れることが望ましが図３および図４に示す誘電体フィル
タの構成では、帯域幅の狭い、例えば５％のフィルタを
構成しようとすると、図３及び図４の例では第１及び第
２の共振器２１，２２間の間隔ｄを２倍程度に広くする
必要を生じるため小型化を達成するのが困難である。Generally, the bandwidth required for a dielectric filter is determined by the requirements of the system. Although it is desirable that the filter technology can meet as wide a demand as possible, in the dielectric filter configuration shown in FIGS. 3 and 4, if a filter having a narrow bandwidth, for example, 5%, is to be configured, the dielectric filter shown in FIGS. In the above example, the distance d between the first and second resonators 21 and 22 needs to be doubled, which makes it difficult to achieve miniaturization.

【０００６】それ故に、小型でしかも帯域幅の狭いフィ
ルタを実現するには、第１及び第２の共振器の間隔を広
げることなく第１及び第２の共振器２１，２２間の結合
を弱くすることができれば可能になることに着目した。
本発明では共振器と共振器との間の結合を弱めるため
に、共振器間に誘電体板を設けることにより、この課題
を解決するものである。即ち、誘電体板は一種のシール
ド効果を有するために共振器の間隔を広げることなく弱
い結合を実現できる誘電体フィルタを提供することにあ
る。Therefore, in order to realize a filter having a small size and a narrow bandwidth, the coupling between the first and second resonators 21 and 22 is weakened without widening the interval between the first and second resonators. We paid attention to what is possible if we can do it.
The present invention solves this problem by providing a dielectric plate between the resonators in order to weaken the coupling between the resonators. That is, since the dielectric plate has a kind of shielding effect, it is to provide a dielectric filter that can realize weak coupling without widening the space between the resonators.

【０００７】[0007]

【課題を解決するための手段】本発明によれば、互いに
対向する２枚の接地導体板と、２つの四角柱形を呈する
誘電体の間に導体板を挾んで重ね合わせてなる共振器
と、前記接地導体板の間に、複数の前記共振器を互いに
所定の間隔を置いて配列し、両端に位置する前記共振器
のそれぞれに静電結合用誘電体を接続し、該静電結合用
誘電体に接続した入力端子及び出力端子とを有している
誘電体フィルタにおいて、少なくとも２つの相隣合う前
記共振器の間に誘電体板を設けたことを特徴とする誘電
体フィルタが得られる。According to the present invention, two ground conductor plates facing each other and a resonator formed by sandwiching the conductor plates between two dielectrics each having a rectangular prism shape are provided. A plurality of the resonators are arranged at predetermined intervals between the ground conductor plates, and a dielectric for electrostatic coupling is connected to each of the resonators located at both ends. A dielectric filter having an input terminal and an output terminal connected to each other, wherein a dielectric plate is provided between at least two adjacent resonators.

【０００８】また、本発明によれば、前記誘電体板の長
さ寸法によって前記共振器間の結合の強さを調整するこ
とを特徴とする誘電体フィルタが得られる。Further, according to the present invention, there is obtained a dielectric filter characterized in that the strength of coupling between the resonators is adjusted by the length dimension of the dielectric plate.

【０００９】また、本発明によれば、前記誘電体板は、
長手方向に一定の長さを持ち、前記２枚の接地導体板に
接続され、前記誘電体板の厚みによって、前記共振器間
の結合の強さを調節することを特徴とする誘電体フィル
タが得られる。According to the present invention, the dielectric plate is
A dielectric filter having a fixed length in the longitudinal direction, connected to the two ground conductor plates, and adjusting the coupling strength between the resonators by the thickness of the dielectric plate. can get.

【００１０】また、本発明によれば、前記誘電体板は、
長手方向に一定の長さ、厚みを持ち、前記２枚の前記接
地導体板に接続され、前記誘電体板の誘電率の大きさに
よって、前記共振器間の結合の強さを調節することを特
徴とする誘電体フィルタが得られる。According to the invention, the dielectric plate is
It has a fixed length and thickness in the longitudinal direction, is connected to the two ground conductor plates, and adjusts the coupling strength between the resonators according to the magnitude of the dielectric constant of the dielectric plates. A characteristic dielectric filter is obtained.

【００１１】また、本発明によれば、２つの誘電体部材
の間に、導体板部材を挾んで重ね合わせた後、一方の接
地導体板に前記誘電体部材を接続し、前記誘電体部材の
一部を削除することによって、前記誘電体部材を分割し
て共振器及び誘電体板を作り、前記一方の接地導体板と
対向する位置にさらにもう一枚の接地導体板を接続する
ことを特徴とする誘電体フィルタの製造方法が得られ
る。Further, according to the present invention, a conductor plate member is sandwiched between two dielectric members and superposed on each other, and then the dielectric member is connected to one of the ground conductor plates. A part of the dielectric member is divided to form a resonator and a dielectric plate, and another ground conductor plate is connected to a position facing the one ground conductor plate. A method of manufacturing a dielectric filter is obtained.

【００１２】[0012]

【実施例】図１は本発明の誘電体フィルタの一実施例を
示している。図１において、図３と同じ部分には同じ符
号を付して説明をする。誘電体フィルタは複数の共振器
を有している。図１に示す誘電体フィルタでは第１の共
振器２１及び第２の共振器２２のみを用いた場合の例を
示している。また、図１は２つの接地導体板５１，５２
を接合した状態で、第２の共振器２２の一端面Ｂ方向か
らみた図である。FIG. 1 shows an embodiment of the dielectric filter of the present invention. In FIG. 1, the same parts as those in FIG. The dielectric filter has a plurality of resonators. The dielectric filter shown in FIG. 1 shows an example in which only the first resonator 21 and the second resonator 22 are used. In addition, FIG. 1 shows two ground conductor plates 51, 52.
FIG. 6 is a view seen from the one end surface B direction of the second resonator 22 in a state where the is joined.

【００１３】第１の共振器２１は一対の四角柱形を呈す
る板状の誘電体２１ａ，２１ｂと、これらの誘電体２１
ａ，２１ｂの中間に挾まれた導体板２４とを有してい
る。導体板２４は一対の誘電体２１ａ，２１ｂに、はん
だ付け等の結合手段によって重ね合わせ結合されてい
る。第２の共振器２２は、図３に示した第２の共振器２
２と同様に一対の四角柱形を呈する誘電体２２ａ，２２
ｂと、これらの誘電体板２２ａ，２２ｂの中間に挾まれ
た導体板２５とを有している。導体板２５は一対の誘電
体２２ａ，２２ｂにはんだ付け等の結合手段によって重
ね合わせ結合されている。第１及び第２の共振器２１，
２２の長手方向を直交する一端面Ａ及び一端面Ｂは短絡
されている。即ち、第１の共振器２１では、図３に示し
た第１の共振器２１と同様に一端面Ａで短絡されてお
り、第２の共振器２２では一端面Ａとは逆側の一端面Ｂ
で短絡されている。The first resonator 21 is a pair of plate-shaped dielectrics 21a and 21b having a rectangular prism shape, and these dielectrics 21.
It has a conductor plate 24 sandwiched between a and 21b. The conductor plate 24 is superposed and coupled to the pair of dielectrics 21a and 21b by a coupling means such as soldering. The second resonator 22 is the second resonator 2 shown in FIG.
A pair of dielectrics 22a, 22 having a rectangular prism shape similar to
b and a conductor plate 25 sandwiched between the dielectric plates 22a and 22b. The conductor plate 25 is superposed and joined to the pair of dielectrics 22a and 22b by a joining means such as soldering. The first and second resonators 21,
One end face A and one end face B orthogonal to the longitudinal direction of 22 are short-circuited. That is, the first resonator 21 is short-circuited at one end face A as in the first resonator 21 shown in FIG. 3, and the second resonator 22 is one end face opposite to the one end face A. B
Shorted with.

【００１４】また、第１及び第２の共振器２１，２２に
は各々入出力用の静電結合用誘電体２６，２７がそれぞ
れ接合されており、さらに静電結合用誘電体２６，２７
の外側には静電結合用導体（導体膜）３０，３１がそれ
ぞれ取り付けられている。静電結合用導体３０，３１に
は出力端子３６及び入力端子３７がそれぞれ取り付けら
れる。これらの第１及び第２の共振器２１，２２の外側
には２枚の接地導体板５１，５２が第１及び第２の共振
器２１，２２全体を覆うような形で互いに結合される。Input / output electrostatic coupling dielectrics 26 and 27 are joined to the first and second resonators 21 and 22, respectively, and the electrostatic coupling dielectrics 26 and 27 are further joined.
Electrostatic coupling conductors (conductor films) 30 and 31 are attached to the outer sides of, respectively. An output terminal 36 and an input terminal 37 are attached to the electrostatic coupling conductors 30 and 31, respectively. Two ground conductor plates 51 and 52 are coupled to each other outside the first and second resonators 21 and 22 in such a manner as to cover the entire first and second resonators 21 and 22.

【００１５】さらに、誘電体フィルタは、少なくとも２
つの相隣合う第１及び第２の共振器２１，２２の間に誘
電体板５が設けらている。誘電体板５は、２枚の接地導
体板５１，５２に接続され、誘電体板５の長手方向の長
さ寸法によって、第１及び第２の共振器２１，２２間の
結合の強さを調節する。また、誘電体板５は、長手方向
に一定の長さを持ち、誘電体板５の厚みによって、第１
及び第２の共振器２１，２２間の結合の強さを調節す
る。また、誘電体板５は、その誘電体板５の誘電率の大
きさによっても、第１及び第２の共振器２１，２２間の
結合の強さを調節できる。Further, at least two dielectric filters are provided.
A dielectric plate 5 is provided between two adjacent first and second resonators 21 and 22. The dielectric plate 5 is connected to the two ground conductor plates 51 and 52, and the strength of the coupling between the first and second resonators 21 and 22 depends on the length dimension of the dielectric plate 5 in the longitudinal direction. Adjust. Further, the dielectric plate 5 has a certain length in the longitudinal direction, and depending on the thickness of the dielectric plate 5, the first
And the strength of the coupling between the second resonators 21 and 22 is adjusted. Further, the dielectric plate 5 can adjust the coupling strength between the first and second resonators 21 and 22 depending on the magnitude of the dielectric constant of the dielectric plate 5.

【００１６】次に、図２（ａ），図２（ｂ）及び図２
（ｃ）によって、図１における誘電体フィルタの製造方
法を示す。誘電体フィルタの製造方法は、図２（ａ）に
示す２つの誘電体部材（第１及び第２の共振器２１ａ，
２２ａ２１ｂ，２２ｂがそれぞれ一枚である状態の誘電
体）１１，１２の間に、導体板部材１４を挾んで重ね合
わせる。その後、一方を接地導体板５２に一方の誘電体
部材１２を接続し、誘電体部材１１，１２の一部を削除
することによって、誘電体部材１１，１２を分割し、第
１及び第２の共振器２１，２２及び誘電体板５を作る。
さらに、接地導体板５２と対向する位置にもう一枚の接
地導体板５１を接続する。図２（ａ）においては、予め
２つの誘電体部材１１，１２の中間に、導体板部材１４
を重ね合わせた後に、誘電体部材１１，１２の全面に金
属メッキ等の手段を用いて導体膜を形成しておき、接地
導体板５２に接続する。導体膜を形成する方法として
は、スパッタや焼き付けなどがある。Next, FIGS. 2 (a), 2 (b) and 2
1C shows a method for manufacturing the dielectric filter in FIG. The method of manufacturing the dielectric filter is performed by using the two dielectric members (first and second resonators 21a, 21a shown in FIG. 2A).
The conductor plate member 14 is sandwiched between the dielectrics 11 and 12 in the state where each of the dielectrics 22a21b and 22b is one. After that, one of the dielectric members 12 is connected to the ground conductor plate 52, and the dielectric members 11 and 12 are partially removed to divide the dielectric members 11 and 12 into the first and second dielectric members. The resonators 21 and 22 and the dielectric plate 5 are made.
Further, another ground conductor plate 51 is connected to a position facing the ground conductor plate 52. In FIG. 2A, the conductor plate member 14 is previously provided in the middle of the two dielectric members 11 and 12.
After they are superposed on each other, a conductor film is formed on the entire surfaces of the dielectric members 11 and 12 by using a method such as metal plating and connected to the ground conductor plate 52. As a method for forming the conductor film, there are sputtering, baking, and the like.

【００１７】即ち、図１で示した第１及び第２の共振器
２１，２２配列及び、２つの隣合う第１及び第２の共振
器２１，２２間にシールド用の誘電体板５を構成できる
よう誘電体部材１１，１２の一部を削除するには、図２
（ｂ）で示すようにをカッター等を用いて誘電体部材１
１，１２の中央部、かつ長手方向に２か所の削除部分１
８，１９で削除する。削除した後、第１及び第２の共振
器２１，２２の側面には導体膜が存在しない側面及び誘
電体板５の両方の端面の導体膜も削り取る。また、不要
な端部側の導体膜は削り取ることにより第１及び第２の
共振器２１，２２の一端部は短絡、他の端部は開放され
る。That is, the first and second resonators 21 and 22 array shown in FIG. 1 and the shield dielectric plate 5 are formed between two adjacent first and second resonators 21 and 22. To remove some of the dielectric members 11 and 12 so that
As shown in (b), using a cutter or the like, the dielectric member 1
1 and 12 central part, and two deleted parts 1 in the longitudinal direction
Deleted at 8 and 19. After the removal, the conductor films on both side surfaces of the first and second resonators 21 and 22 where no conductor film exists and on the end surfaces of the dielectric plate 5 are also removed. Further, by scraping off the unnecessary conductor film on the end side, one ends of the first and second resonators 21 and 22 are short-circuited and the other ends are opened.

【００１８】図２（ｂ）において、第１の共振器２１
は、紙面の右側（後面）の一端部Ａが短絡され、第２の
共振器２２では紙面の左側（前面）の一端部Ｂが短絡さ
れている。その後、図２（ｃ）に示したように、接地導
体板５１が接続されていない側の第１及び第２の共振器
２１，２２の上面を接地導体板５２に接続する。シール
ド用の誘電体板５は、長手方向に第１及び第２の共振器
２１，２２全体を覆っている。In FIG. 2B, the first resonator 21
Is short-circuited at one end A on the right side (rear surface) of the paper surface, and at the second resonator 22, one end B at the left side (front surface) of the paper surface is short-circuited. After that, as shown in FIG. 2C, the upper surfaces of the first and second resonators 21 and 22 on the side to which the ground conductor plate 51 is not connected are connected to the ground conductor plate 52. The shield dielectric plate 5 covers the entire first and second resonators 21 and 22 in the longitudinal direction.

【００１９】また、シールド用の誘電体板５の上面をメ
タライズするなどして、接地導体板５１，５２に、はん
だ付け等の手法により機械的にしっかりと固定されると
同時に、電気的にも接地導体板５１，５２と接合され
る。さらに、第１及び第２の共振器２１，２２の開放端
側の側面には、静電結合用誘電体２６，２７が接合さ
れ、静電結合用導体３０，３１を介して出力端子３６及
び入力端子３７が取り付けられる。Further, the upper surface of the shield dielectric plate 5 is metallized to be mechanically firmly fixed to the ground conductor plates 51 and 52 by a method such as soldering, and at the same time, electrically. It is joined to the ground conductor plates 51 and 52. Furthermore, electrostatic coupling dielectrics 26 and 27 are joined to the side surfaces of the first and second resonators 21 and 22 on the open end side, and the output terminals 36 and The input terminal 37 is attached.

【００２０】第１及び第２の共振器２１，２２間の結合
の強さは、シールド用の誘電体板５の厚み、または誘電
率の大きさによって調節が可能であり、シールド用の誘
電体板５を用いずに調節する場合より、必要な間隙は小
さくてすむ。The strength of the coupling between the first and second resonators 21 and 22 can be adjusted by the thickness of the shield dielectric plate 5 or the magnitude of the dielectric constant, and the shield dielectric is used. The required clearance is smaller than when the adjustment is performed without using the plate 5.

【００２１】なお、全面のメッキなどの手段を用いて導
体膜を形成し接地導体板５１，５２に接続後、不要部の
導体膜を削り取る替りに、上下面のみメッキなどの手段
を用いて導体膜を形成し、後から、端部の必要な部分を
メタライズするなどして短絡しても良い。After forming a conductor film by means such as plating on the entire surface and connecting it to the ground conductor plates 51, 52, instead of scraping away the conductor film at unnecessary portions, means such as plating only on the upper and lower surfaces is used. It is also possible to form a film and short-circuit later by metallizing the necessary portions of the end portions.

【００２２】[0022]

【発明の効果】以上実施例に明記の通り、本発明の誘電
体フィルタによれば、共振器と共振器との間の結合を弱
めるために、共振器間に誘電体板を設けることにより、
小型で狭い帯域幅を持った誘電体フィルタの実現でき
る。As described in the above embodiments, according to the dielectric filter of the present invention, by providing a dielectric plate between the resonators in order to weaken the coupling between the resonators,
It is possible to realize a compact dielectric filter having a narrow bandwidth.

【００２３】また、本発明の誘電体フィルタの製造方法
によれば、四角柱形誘電体の中間に、導体板を挾んで重
ね合わせた後、その一方を接地導体板に接続し、四角柱
形誘電体の一部を削除することによって、共振器及び誘
電体板を構成するため、簡単な製造方法によって誘電体
フィルタを作ることができる。Further, according to the method of manufacturing a dielectric filter of the present invention, a conductor plate is sandwiched between the square pillar-shaped dielectric bodies and then one of them is connected to a ground conductor plate to form a square pole shape. Since the resonator and the dielectric plate are formed by removing a part of the dielectric, the dielectric filter can be manufactured by a simple manufacturing method.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の誘電体フィルタの一実施例を示す側面
図である。FIG. 1 is a side view showing an embodiment of a dielectric filter of the present invention.

【図２】図１の誘電体フィルタの製造方法を説明する説
明図であって、（ａ）は誘電体部材を重ね合わせた状態
で、一方の接地導体板に接続する前の状態を示す斜視図
（ｂ）は（ａ）の誘電体部材を一方の接地導体板に接続
した状態で誘導体板を形成するための削除部分を示す斜
視図、（ｃ）は誘導体板を形成した後に他方の接地導体
板を接続する前の状態を示す斜視図である。FIG. 2 is an explanatory view illustrating a method of manufacturing the dielectric filter of FIG. 1, in which (a) is a perspective view showing a state in which dielectric members are superposed and before being connected to one ground conductor plate. FIG. 6B is a perspective view showing a deleted portion for forming a dielectric plate in a state where the dielectric member of FIG. 4A is connected to one ground conductor plate, and FIG. It is a perspective view showing the state before connecting a conductor board.

【図３】従来の誘電体フィルタの分解斜視図である。FIG. 3 is an exploded perspective view of a conventional dielectric filter.

【図４】図３の誘電体フィルタを組み立てた状態を示す
側面図である。FIG. 4 is a side view showing a state where the dielectric filter of FIG. 3 is assembled.

【符号の説明】[Explanation of symbols]

１１，１２ 誘電体部材 １８，１９ 削除部分 ２１ 第１の共振器 ２１ａ，２１ｂ，２２ａ，２２ｂ 誘電体 ２２ 第２の共振器 １４，２４，２５ 導体板 ２６，２７ 静電結合用誘電体 ３０，３１ 静電結合用導体 ３６，３７ 入出力端子 ５１，５２ 接地導体板 11, 12 Dielectric member 18, 19 Deleted portion 21 First resonator 21a, 21b, 22a, 22b Dielectric 22 Second resonator 14, 24, 25 Conductor plate 26, 27 Electrostatic coupling dielectric 30, 31 Electrostatic coupling conductor 36, 37 Input / output terminal 51, 52 Ground conductor plate

───────────────────────────────────────────────────── フロントページの続き (72)発明者 矢野 健 神奈川県川崎市高津区子母口398番地 株 式会社トーキン内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ken Yano 398 Komokuchi, Takatsu-ku, Kawasaki City, Kanagawa Prefecture

Claims (5)

【特許請求の範囲】[Claims] 【請求項１】 互いに対向する２枚の接地導体板と、２
つの四角柱形を呈する誘電体の間に導体板を挾んで重ね
合わせてなる共振器と、前記接地導体板の間に、複数の
前記共振器を互いに所定の間隔を置いて配列し、両端に
位置する前記共振器のそれぞれに静電結合用誘電体を接
続し、該静電結合用誘電体に接続した入力端子及び出力
端子とを有している誘電体フィルタにおいて、少なくと
も２つの相隣合う前記共振器の間に誘電体板を設けたこ
とを特徴とする誘電体フィルタ。1. Two ground conductor plates facing each other and 2
A resonator in which a conductor plate is sandwiched between two dielectrics having a rectangular prism shape, and a plurality of the resonators are arranged at predetermined intervals between the ground conductor plate, and the resonators are arranged at both ends. At least two adjacent resonances in a dielectric filter having an electrostatic coupling dielectric connected to each of the resonators and having an input terminal and an output terminal connected to the electrostatic coupling dielectric. A dielectric filter, characterized in that a dielectric plate is provided between the vessels. 【請求項２】 前記誘電体板の長さ寸法によって前記共
振器間の結合の強さを調整することを特徴とする請求項
１記載の誘電体フィルタ。2. The dielectric filter according to claim 1, wherein the coupling strength between the resonators is adjusted according to the length dimension of the dielectric plate. 【請求項３】 前記誘電体板は、長手方向に一定の長さ
を持ち、前記接地導体板に接続され、前記誘電体板の厚
みによって、前記共振器間の結合の強さを調節すること
を特徴とする請求項１記載の誘電体フィルタ。3. The dielectric plate has a fixed length in the longitudinal direction, is connected to the ground conductor plate, and adjusts the strength of coupling between the resonators according to the thickness of the dielectric plate. The dielectric filter according to claim 1, wherein: 【請求項４】 前記誘電体板は、長手方向に一定の長
さ、厚みを持ち、前記接地導体板に接続され、前記誘電
体板の誘電率の大きさによって、前記共振器間の結合の
強さを調節することを特徴とする請求項１記載の誘電体
フィルタ。4. The dielectric plate has a constant length and thickness in the longitudinal direction, is connected to the ground conductor plate, and the coupling between the resonators depends on the magnitude of the dielectric constant of the dielectric plate. The dielectric filter according to claim 1, wherein the strength is adjusted. 【請求項５】 ２つの誘電体部材の間に、導体板部材を
挾んで重ね合わせた後、一方の接地導体板に前記誘電体
部材を接続し、前記誘電体部材の一部を削除することに
よって、前記誘電体部材を分割して共振器及び誘電体板
を作り、前記一方の接地導体板と対向する位置にさらに
もう一枚の接地導体板を接続することを特徴とする誘電
体フィルタの製造方法。5. A conductor plate member is sandwiched between two dielectric members and superposed, and then the dielectric member is connected to one ground conductor plate, and a part of the dielectric member is removed. By dividing the dielectric member into a resonator and a dielectric plate, and further connecting another ground conductor plate to a position facing the one ground conductor plate. Production method.