JPH0793524B2 - Dielectric filter - Google Patents
Dielectric filterInfo
- Publication number
- JPH0793524B2 JPH0793524B2 JP2010995A JP1099590A JPH0793524B2 JP H0793524 B2 JPH0793524 B2 JP H0793524B2 JP 2010995 A JP2010995 A JP 2010995A JP 1099590 A JP1099590 A JP 1099590A JP H0793524 B2 JPH0793524 B2 JP H0793524B2
- Authority
- JP
- Japan
- Prior art keywords
- resonator
- dielectric
- tube axis
- axis direction
- coupling
- 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 - Fee Related
Links
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明はマイクロ波帯等で用いる誘電体フィルタに関
し、更に詳しくは、誘電体ブロックのほぼ全面に導体膜
を形成した導波管型共振器を用いる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 dielectric filter used in a microwave band or the like, and more specifically, to a waveguide resonator in which a conductor film is formed on substantially the entire surface of a dielectric block. The present invention relates to a bandpass filter using
この誘電体フィルタは、例えばマイクロ波多重通信、衛
星通信、移動体通信等の分野で有用である。This dielectric filter is useful in fields such as microwave multiplex communication, satellite communication, and mobile communication.
［従来の技術］ マイクロ波帯で用いる帯域通過フィルタの一つとして、
方形空洞共振器を用いた導波管フィルタがある。この導
波管フィルタでは、誘導性金属窓を設けた共振器を多段
に連結し、共振器壁面に共振周波数調整用のネジを設け
る。[Prior Art] As one of bandpass filters used in the microwave band,
There is a waveguide filter using a rectangular cavity resonator. In this waveguide filter, resonators provided with inductive metal windows are connected in multiple stages, and a screw for adjusting resonance frequency is provided on the resonator wall surface.
また別の技術として誘電体共振器を用いたものもある。
その代表的な例は、直方体状の誘電体ブロックの長手方
向に共振子穴と結合子穴を交互に設け、それらの穴が開
口している面の一方を除く誘電体ブロックの各面および
共振子穴の内面に導体膜を形成した４分の１波長共振型
の同軸フィルタである。Another technique uses a dielectric resonator.
A typical example is that resonator holes and connector holes are alternately provided in the longitudinal direction of a rectangular parallelepiped dielectric block, and each surface of the dielectric block except one of the surfaces where those holes are open and the resonance. This is a quarter-wavelength resonance type coaxial filter in which a conductor film is formed on the inner surface of a small hole.
［発明が解決しようとする課題］ しかし導波管フィルタはマイクロ波帯では大きすぎる欠
点がある。[Problems to be Solved by the Invention] However, the waveguide filter has a drawback that it is too large in the microwave band.
それに対して誘電体フィルタは、比誘電率の大きい誘電
体を用いるため小型化できる利点があるが、各共振素子
間で適切な結合を得るための構造が複雑であり、設計並
びに製作・調整が煩雑であるし、Ｑ値もやや劣る。On the other hand, the dielectric filter has the advantage that it can be miniaturized because it uses a dielectric with a large relative permittivity, but the structure for obtaining an appropriate coupling between the resonant elements is complicated, and the design, manufacture, and adjustment are difficult. It is complicated and the Q value is slightly inferior.
本発明の目的は、上記のような従来技術の欠点を解消
し、製作し易く、Ｑ値が大きく、且つ十分小型化できる
誘電体帯域通過フィルタを提供することにある。An object of the present invention is to solve the above-mentioned drawbacks of the prior art, to provide a dielectric bandpass filter which is easy to manufacture, has a large Q value, and can be sufficiently miniaturized.
［課題を解決するための手段］ 上記の目的を達成できる本発明は、誘電体ブロックのほ
ぼ全面に導体膜を形成した導波管型共振器を用いるもの
において、前記誘電体ブロックはその管軸方向に延びる
溝を有する形状をなし、管軸方向の端面に導体膜の無い
結合部を設け、その共振器を複数個管軸方向に連結して
結合部で互いに結合させ、それら連結構造体の両端部に
入出力部を設けた誘電体フィルタである。[Means for Solving the Problems] The present invention that can achieve the above object uses a waveguide resonator in which a conductor film is formed on substantially the entire surface of a dielectric block, wherein the dielectric block has a tube axis. Forming a shape having a groove extending in the axial direction, and providing a coupling part without a conductor film on the end face in the tube axis direction, coupling a plurality of resonators in the tube axis direction and coupling them with each other at the coupling part, The dielectric filter has an input / output unit at both ends.
ここで誘電体ブロックの形状は、その上下両面の中央に
溝を設けた横断面Ｈ型とするのが好ましい。共振器間の
結合部は、互いに対向する位置に導体膜が無い結合窓と
するか、両方の誘電体ブロックにそれぞれ半分ずつ結合
ピンを挿入する構成などがある。Here, the shape of the dielectric block is preferably an H-shaped cross section having grooves formed in the centers of the upper and lower surfaces thereof. The coupling portion between the resonators may be a coupling window having no conductor film at a position facing each other, or a configuration in which half of each coupling pin is inserted into both dielectric blocks.
誘電体ブロックの管軸方向長さは、管軸波長λｇの1/2
である。The length of the dielectric block in the tube axis direction is 1/2 of the tube axis wavelength λg.
Is.
［作用］ 方形導波管のTEモードについて考えると、導波管内の電
磁界は横幅方向では共振し、管軸方向に伝搬する。横方
向の共振は導波管の横幅が半波長の整数倍という条件を
満足する。このため方形導波管は、基本的にはその横断
面の形状寸法によって決まる遮断周波数をもつ高域通過
フィルタとして動作する。方形導波管の内部が誘電体で
構成されていると、その大きな比誘電率によって遮断周
波数が低くなり小型化できることになる。[Operation] Considering the TE mode of the rectangular waveguide, the electromagnetic field in the waveguide resonates in the width direction and propagates in the tube axis direction. The resonance in the lateral direction satisfies the condition that the lateral width of the waveguide is an integral multiple of a half wavelength. Therefore, the rectangular waveguide basically operates as a high-pass filter having a cutoff frequency determined by the shape and size of its cross section. If the inside of the rectangular waveguide is made of a dielectric material, the cutoff frequency is lowered due to its large relative permittivity, and the size can be reduced.
本発明のように誘電体ブロックがその管軸方向に延びる
溝を有すると、溝によって低くなった誘電体の部分に電
界が集中するため、見掛け上、集中定数的に容量（キャ
パシタンス成分）が挿入されたようになる。この容量分
によって全体の共振波長が長くなり、共振周波数が低く
なる方にずれる。このため更に小型化できることにな
る。When the dielectric block has a groove extending in the tube axis direction as in the present invention, the electric field is concentrated in the portion of the dielectric that is lowered by the groove, so that the capacitance (capacitance component) is apparently inserted as a lumped constant. It will be as was done. Due to this capacitance, the overall resonance wavelength becomes longer and the resonance frequency shifts toward the lower side. Therefore, the size can be further reduced.
そして本発明では両端面にも導体膜を有する所定方向の
管軸方向寸法の共振器を用いているため、内部に導入さ
れた電磁波は管軸方向の両端面で反射して元の方向に戻
り共振する。この共振器が結合部によって次の共振器と
結合する。このようにして複数の共振器を管軸方向に連
結することにより、良好な帯域通過特性を呈するフィル
タが得られる。Further, in the present invention, since a resonator having conductor film also on both end surfaces and having a predetermined dimension in the tube axis direction is used, electromagnetic waves introduced inside are reflected by both end surfaces in the tube axis direction and return to the original direction. Resonate. This resonator is coupled to the next resonator by the coupling portion. By connecting a plurality of resonators in the tube axis direction in this way, a filter exhibiting good bandpass characteristics can be obtained.
［実施例］ 第１図は本発明に係る誘電体フィルタの一実施例を示す
分解斜視図であり、３個の誘電体共振器を組み合わせた
３段構成の例である。[Embodiment] FIG. 1 is an exploded perspective view showing an embodiment of a dielectric filter according to the present invention, which is an example of a three-stage structure in which three dielectric resonators are combined.
各共振器10はチタン酸バリウム等の高誘電率セラミック
ス焼結体からなる所定形状の誘電体ブロックのほぼ全面
に導体膜12を形成して導波管型共振器としたものであ
る。前記誘電体ブロックは、その上下両面の中央に管軸
方向に延びる溝14を有し、横断面がＨ型をなしている。
各共振器10の管軸方向の長さｌは、管軸波長λｇの半分
（即ちｌ＝λg/2）である。Each resonator 10 is a waveguide type resonator in which a conductor film 12 is formed on substantially the entire surface of a dielectric block of a predetermined shape made of a high dielectric constant ceramics sintered body such as barium titanate. The dielectric block has a groove 14 extending in the tube axis direction at the center of both upper and lower surfaces thereof, and has an H-shaped cross section.
The length 1 of each resonator 10 in the tube axis direction is half the tube axis wavelength λg (that is, 1 = λg / 2).
本発明では管軸方向の端部に導体膜の無い結合部を有す
る。この実施例では、結合部は端面の下方両側に設けた
結合窓16である。このような共振器10を３個、管軸方向
に連結して結合窓16で互いに結合させる。第１図には図
示されていないが、それら連結構造体の両端部に後述す
るような入出力部を設ける。In the present invention, the joint portion having no conductor film is provided at the end in the tube axis direction. In this embodiment, the coupling part is a coupling window 16 provided on both sides below the end face. Three such resonators 10 are connected in the tube axis direction and are connected to each other through the coupling window 16. Although not shown in FIG. 1, an input / output unit, which will be described later, is provided at both ends of the connection structure.
なお図面において、細かな点々を付した部分は導体膜が
無く誘電体の素地が露出している部分であり、それ以外
は導体膜で覆われることになる。導体膜は、例えば銀ペ
ーストの焼付け等により形成したものであってよい。It should be noted that in the drawings, the portions marked with fine dots are portions where the conductor film is not present and the base material of the dielectric is exposed, and the other portions are covered with the conductor film. The conductor film may be formed by, for example, baking a silver paste.
共振器10の管軸方向の端面形状を第２図に示す。同図に
おいて矢印は電界の方向を表している。横幅をa1,高さ
をb1とし、溝の幅をa2,溝で挾まれた誘電体部分の高さ
をb2とすると、遮断周波数λｃは次式で表される。The shape of the end face of the resonator 10 in the tube axis direction is shown in FIG. In the figure, the arrow indicates the direction of the electric field. If the width is a 1 , the height is b 1 , the width of the groove is a 2 , and the height of the dielectric portion sandwiched by the groove is b 2 , the cutoff frequency λc is expressed by the following equation.
なおεｒは誘電体の比誘電率である。例えばεｒ＝90,a
1＝10mm,a2＝5mm,b1＝5mm,b2＝2.5mmとすると、λｃは
約210mmとなり、遮断周波数fcは約714MHzになる。従っ
て上記程度の小さな共振器でマイクロ波帯用のフィルタ
を構成できることになる。また、 の時それぞれTE20,TE30のモードを基本モードより高い
位置におくことができ、広帯域で動作させることができ
る。 Note that εr is the relative permittivity of the dielectric. For example, εr = 90, a
When 1 = 10 mm, a 2 = 5 mm, b 1 = 5 mm, b 2 = 2.5 mm, λc is about 210 mm, and the cutoff frequency fc is about 714 MHz. Therefore, a filter for the microwave band can be constructed with a resonator as small as the above. Also, At that time, the TE 20 mode and the TE 30 mode can be set higher than the basic mode, respectively, and can operate in a wide band.
結合部の構造は上記の実施例に限られるものではない。
第３図は共振器の管軸方向の端面中央に１個所導体膜の
無い結合窓18を設け、その部分を密着させて互いに結合
させている。第４図に示す例は、端面中央部分に共通の
結合ピン20をそれぞれ半分ずつ挿入し、その結合ピン20
によって結合させている。The structure of the connecting portion is not limited to the above embodiment.
In FIG. 3, a coupling window 18 without a conductor film is provided at one location in the center of the end surface of the resonator in the tube axis direction, and the portions are closely contacted and coupled to each other. In the example shown in FIG. 4, half of the common connecting pins 20 are respectively inserted in the central portion of the end face, and the connecting pins 20 are
Are bound by.
連結構造体の両端部に設ける入出力部は、例えば第５図
に示すように、共振器10の溝14の部分に高さ方向の穴22
を設け、それにスプリング入出力端子24を挿入したり、
あるいは同軸入出力端子26を挿入する。その他、第６図
及び第７図に示すように、両端に位置する共振器10の端
面両下部に導体膜の無い部分28を設け、Ｌ型の接続端子
30によって基板の二股状のストリップライン32と共振器
の入出力用導体パターン34とを半田付け等により接続す
る構造でもよい。この場合、共振器の両端の入出力部が
設けられる下面は導体膜の無い部分36を作り、その部分
での短絡を防止する。入出力部は片側のみでもよいが、
結合を強くするためには第６図に示すように両側から励
振する方が好ましい。The input / output portions provided at both ends of the connection structure are, for example, as shown in FIG. 5, holes 22 in the height direction at the groove 14 of the resonator 10.
And insert the spring input / output terminal 24 into it,
Alternatively, the coaxial input / output terminal 26 is inserted. In addition, as shown in FIG. 6 and FIG. 7, a portion 28 without a conductor film is provided on both lower portions of the end face of the resonator 10 located at both ends, and an L-type connection terminal is provided.
A structure in which the bifurcated strip line 32 of the substrate and the input / output conductor pattern 34 of the resonator are connected by soldering or the like by 30 may be used. In this case, the lower surface provided with the input / output portions at both ends of the resonator is formed with a portion 36 having no conductor film to prevent a short circuit at that portion. The input / output section may be on one side only,
In order to strengthen the coupling, it is preferable to excite from both sides as shown in FIG.
また本発明の他の実施例として、第８図に示すように共
振器の溝を利用してリジェクションフィルタ38を搭載す
る構成もある。このようにすると、フィルタの通信帯域
がより一層急峻になった特性が得られる。Further, as another embodiment of the present invention, as shown in FIG. 8, there is a configuration in which the rejection filter 38 is mounted by utilizing the groove of the resonator. By doing so, it is possible to obtain the characteristic that the communication band of the filter becomes steeper.
上記の実施例はいずれも上面と下面に溝を設けた横断面
Ｈ型構造であるが、場合によっては片側のみに溝を設け
た横断面凹型構造でもよい。しかし凹型構造ではＱ値が
低下するから、Ｈ型のように対称的に同一寸法の溝を設
けるのが好ましい。また共振器を連結する個数、即ち段
数は上記２個あるいは４個以上であってもよい。In each of the above embodiments, the cross-section has an H-shaped structure in which grooves are provided on the upper surface and the lower surface. However, in some cases, a cross-sectional concave structure having grooves on only one side may be used. However, since the Q value is lowered in the concave structure, it is preferable to symmetrically provide grooves having the same size as in the H type. The number of resonators connected, that is, the number of stages may be two or four or more.
［発明の効果］ 本発明は上記のように誘電体を用いる導波管型共振器に
おいて管軸方向に延びる溝を形成したから、その溝近傍
の誘電体に電界が集中して見掛け上、集中定数的に容量
が挿入されたようになり、共振波長が長くなり装置を小
型化できる。また本発明では結合部を有する共振器を複
数個、管軸方向に連結して互いに結合させるものである
から、帯域通過特性を呈し、構造も比較的簡単であり、
製作し易く、しかもＱ値は従来の同軸型誘電体フィルタ
よりも大きくなる。[Advantages of the Invention] According to the present invention, since the groove extending in the tube axis direction is formed in the waveguide type resonator using the dielectric as described above, the electric field is concentrated on the dielectric near the groove and apparently concentrated. The capacitance is inserted in a constant manner, the resonance wavelength is lengthened, and the device can be downsized. Further, in the present invention, since a plurality of resonators having a coupling portion are coupled to each other by coupling in the tube axis direction, exhibiting bandpass characteristics, the structure is relatively simple,
It is easy to manufacture, and the Q value is larger than that of the conventional coaxial type dielectric filter.
第１図は本発明に係る誘電体フィルタの一実施例を示す
分解斜視図、第２図はその横断面の寸法と電界方向を示
す説明図である。第３図及び第４図は本発明の他の結合
部の構成例を示す斜視図である。第５図は本発明におけ
る入出力部の例を示す説明図、第６図は入出力部の他の
例を示す説明図、第７図はその拡大図である。第８図は
本発明の他の実施例の部分斜視図である。 10……共振器、12……導体膜、14……溝、16,18……結
合窓、20……結合ピン、24……スプリング入出力端子、
26……同軸入出力端子。FIG. 1 is an exploded perspective view showing an embodiment of a dielectric filter according to the present invention, and FIG. 2 is an explanatory view showing dimensions of a cross section and electric field directions. FIG. 3 and FIG. 4 are perspective views showing a configuration example of another coupling portion of the present invention. FIG. 5 is an explanatory view showing an example of the input / output unit in the present invention, FIG. 6 is an explanatory view showing another example of the input / output unit, and FIG. 7 is an enlarged view thereof. FIG. 8 is a partial perspective view of another embodiment of the present invention. 10 ... Resonator, 12 ... Conductive film, 14 ... Groove, 16,18 ... Coupling window, 20 ... Coupling pin, 24 ... Spring input / output terminal,
26: Coaxial input / output terminal.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭63−58701（ＪＰ，Ａ) 特開 昭63−10802（ＪＰ，Ａ) 特開 昭61−253901（ＪＰ，Ａ) 特開 昭58−1301（ＪＰ，Ａ) 特開 昭61−77403（ＪＰ，Ａ) 特開 昭54−55150（ＪＰ，Ａ) 実開 昭62−58907（ＪＰ，Ｕ) 実開 昭59−11504（ＪＰ，Ｕ) 特公 昭49−22343（ＪＰ，Ｂ１) 米国特許2909735（ＵＳ，Ａ) ＩＥＥＥ Ｔｒａｎｓ．ＭＴＴ，Ａｐ ｒ．，1967（ＰＰ．273−274) ─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-63-58701 (JP, A) JP-A-63-10802 (JP, A) JP-A-61-253901 (JP, A) JP-A-58- 1301 (JP, A) JP 61-77403 (JP, A) JP 54-55150 (JP, A) Actually opened 62-58907 (JP, U) Actually opened 59-11504 (JP, U) JP-B-49-22343 (JP, B1) US Patent 2909735 (US, A) IEEE Trans. MTT, Ap r. , 1967 (PP.273-274)
Claims (3)
した導波管型共振器を用いる誘電体フィルタにおいて、
前記誘電体ブロックはその上下両面の中央に管軸方向に
延びる溝を有する横断面Ｈ型の形状をなし、管軸方向の
端面に導体膜の無い結合部を設けて共振器とし、その共
振器を複数個管軸方向に連結して結合部で互いに結合さ
せ、それら連結構造体の両端に位置する共振器の端面の
下部両側に導体膜の無い部分を設け、その導体膜の無い
部分に、接続端子によって共振器と基板の二股状ストリ
ップ線路と接続するための入出力用導体パターンを島状
に設けたことを特徴とする誘電体フィルタ。1. A dielectric filter using a waveguide type resonator, wherein a conductor film is formed on substantially the entire surface of a dielectric block.
The dielectric block has an H-shaped cross section having a groove extending in the tube axis direction at the center of both upper and lower sides thereof, and a resonator having a coupling portion having no conductor film on the end surface in the tube axis direction to form a resonator. A plurality of parts are connected in the tube axis direction and are connected to each other at the connecting parts, and portions without conductor films are provided on both lower sides of the end faces of the resonators located at both ends of those connecting structures, and the portions without conductor films are provided, A dielectric filter, wherein an input / output conductor pattern for connecting to a resonator and a forked strip line of a substrate is provided in an island shape by a connection terminal.
に設けた導体膜の無い結合窓である請求項１記載の誘電
体フィルタ。2. The dielectric filter according to claim 1, wherein the coupling portion between the resonators is a coupling window provided at a position facing each other and having no conductor film.
体ブロックにそれぞれ部分的に挿入された結合ピンから
なる請求項１記載の誘電体フィルタ。3. The dielectric filter according to claim 1, wherein the coupling portions between the resonators are coupling pins that are partially inserted in the dielectric blocks facing each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010995A JPH0793524B2 (en) | 1990-01-20 | 1990-01-20 | Dielectric filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010995A JPH0793524B2 (en) | 1990-01-20 | 1990-01-20 | Dielectric filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03216001A JPH03216001A (en) | 1991-09-24 |
| JPH0793524B2 true JPH0793524B2 (en) | 1995-10-09 |
Family
ID=11765724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2010995A Expired - Fee Related JPH0793524B2 (en) | 1990-01-20 | 1990-01-20 | Dielectric filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0793524B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3379415B2 (en) * | 1997-02-14 | 2003-02-24 | 株式会社村田製作所 | Dielectric filter and dielectric duplexer |
| EP1037299A1 (en) * | 1999-03-10 | 2000-09-20 | TRT Lucent Technologies (SA) | Resonant cavity filter for microwave signals |
| EP1037298A1 (en) * | 1999-03-10 | 2000-09-20 | TRT Lucent Technologies (SA) | Resonant cavity filter for microwave signals |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2909735A (en) | 1955-12-08 | 1959-10-20 | Itt | Twin probe waveguide transition |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5415536B2 (en) * | 1972-06-21 | 1979-06-15 | ||
| JPS581301A (en) * | 1981-06-26 | 1983-01-06 | Fujitsu Ltd | Dielectric filter |
| JPS61253901A (en) * | 1985-05-07 | 1986-11-11 | Nippon Dengiyou Kosaku Kk | Dielectric resonator |
| JPS6258701A (en) * | 1985-09-06 | 1987-03-14 | Alps Electric Co Ltd | Waveguide filter |
| JPS6310802A (en) * | 1986-07-01 | 1988-01-18 | Mitsubishi Electric Corp | Branch waveguide type band stop filter |
-
1990
- 1990-01-20 JP JP2010995A patent/JPH0793524B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2909735A (en) | 1955-12-08 | 1959-10-20 | Itt | Twin probe waveguide transition |
Non-Patent Citations (1)
| Title |
|---|
| ＩＥＥＥＴｒａｎｓ．ＭＴＴ，Ａｐｒ．，１９６７（ＰＰ．２７３−２７４） |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03216001A (en) | 1991-09-24 |
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