JP2857078B2 - Method of adjusting bandwidth of dielectric filter - Google Patents
Method of adjusting bandwidth of dielectric filterInfo
- Publication number
- JP2857078B2 JP2857078B2 JP5368495A JP5368495A JP2857078B2 JP 2857078 B2 JP2857078 B2 JP 2857078B2 JP 5368495 A JP5368495 A JP 5368495A JP 5368495 A JP5368495 A JP 5368495A JP 2857078 B2 JP2857078 B2 JP 2857078B2
- Authority
- JP
- Japan
- Prior art keywords
- conductor
- dielectric filter
- dielectric
- dielectric substrate
- bandwidth
- 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 - Lifetime
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Description
【０００１】[0001]
【産業上の利用分野】本発明は、誘電体フィルタの通過
帯域特性の調整方法に係るもので、特に二枚の誘電体基
板を貼り合わせて複数の共振素子を一体に形成する誘電
体フィルタの通過帯域幅を広げるための調整方法に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adjusting a pass band characteristic of a dielectric filter, and more particularly to a method of adjusting a pass band characteristic of a dielectric filter by integrally bonding two dielectric substrates to form a plurality of resonance elements. The present invention relates to an adjustment method for widening a pass bandwidth.
【０００２】[0002]
【従来の技術】移動体通信等の高周波帯域のフィルタ等
として誘電体フィルタが各方面で利用されている。この
誘電体フィルタにも多くのタイプがあるが、小型化が可
能でかつ製造が容易な誘電体フィルタとして、発明者は
二枚の誘電体基板の一方に凹溝を形成し、これを貼り合
わせて凹溝の部分に内導体、周囲に外導体、そして一方
の端面に短絡導体を形成する１／４波長ＴＥＭ共振型誘
電体フィルタを提案した（特願平4-186100＝特開平6-61
07）。2. Description of the Related Art Dielectric filters are used in various fields as filters in a high-frequency band for mobile communication and the like. There are many types of this dielectric filter, but as a dielectric filter that can be miniaturized and easily manufactured, the inventor formed a concave groove on one of two dielectric substrates and bonded them together. A quarter-wavelength TEM resonance type dielectric filter in which an inner conductor is formed in a concave groove portion, an outer conductor is formed around the groove, and a short-circuit conductor is formed on one end surface (Japanese Patent Application No. 4-186100).
07).
【０００３】図２はその誘電体フィルタ組立前の一例の
斜視図で、凹溝22を形成した誘電体基板20と平板の誘電
体基板21を接着して一体化したものである。接着後に凹
溝22の部分に内導体が形成され、外周面には外導体が形
成される。なお、凹溝の開口する端面の一方にも導体膜
が形成され、短絡端面とされ、凹溝22の開口する端面の
他方は開放端面とされている。これによって、１／４波
長ＴＥＭ共振器を一体に形成した誘電体フィルタが得ら
れる。FIG. 2 is a perspective view of an example of the dielectric filter before assembly, in which a dielectric substrate 20 having a concave groove 22 and a flat dielectric substrate 21 are bonded and integrated. After bonding, an inner conductor is formed in the groove 22 and an outer conductor is formed on the outer peripheral surface. Note that a conductor film is also formed on one of the open end surfaces of the concave groove to be a short-circuit end surface, and the other open end surface of the concave groove 22 is an open end surface. As a result, a dielectric filter integrally formed with the quarter-wave TEM resonator is obtained.
【０００４】この誘電体フィルタにおいては、誘電体基
板20と誘電体基板21の接着面に導体パターンを形成した
後に接着することができる。したがって、従来開放端面
等に形成していた結合調整電極を内部に形成できる。凹
溝の間に導体膜26ａ、26ｂをそれぞれ凹溝に形成された
内導体と接続して近接対向させると容量が形成され、こ
れによって誘電体共振器間に容量性の結合が得られる。
導体膜の対向長等によって結合容量を調整することがで
きる。[0004] In this dielectric filter, a conductive pattern can be formed on the bonding surface between the dielectric substrate 20 and the dielectric substrate 21 and then bonded. Therefore, the coupling adjustment electrode conventionally formed on the open end face or the like can be formed inside. When the conductor films 26a and 26b are respectively connected to the inner conductors formed in the concave grooves so as to be closely opposed to each other between the concave grooves, a capacitance is formed, whereby capacitive coupling is obtained between the dielectric resonators.
The coupling capacitance can be adjusted by adjusting the facing length of the conductor film.
【０００５】また、誘電体基板の接着面には入出力用の
導体膜27を形成して、端子電極に接続してもよい。この
端子電極との接続はインピーダンス整合点から直接接続
させてもよいし、前記と同様に容量を形成して入出力結
合容量を介して接続するようにしてもよい。Further, an input / output conductor film 27 may be formed on the bonding surface of the dielectric substrate and connected to the terminal electrodes. The connection with the terminal electrode may be made directly from the impedance matching point, or a capacitor may be formed in the same manner as described above and connected via an input / output coupling capacitor.
【０００６】[0006]
【発明が解決しようとする課題】上記の構造の誘電体フ
ィルタに限らず、誘電体セラミックを成形、焼成して製
造する誘電体フィルタにおいては、焼成体の収縮等の影
響によって特性を一定にすることが難しく、共振周波数
や通過帯域幅等を調整することが必要となる。共振周波
数は誘電体の寸法を調整することによって行っており、
通過帯域幅を調整するためには共振器ユニット間の結合
を調整することが一般的である。In a dielectric filter manufactured by molding and firing a dielectric ceramic, the characteristics are not limited to the dielectric filter having the above structure, and the characteristics are made constant by the influence of shrinkage of the fired body. It is difficult to adjust the resonance frequency and the pass bandwidth. The resonance frequency is adjusted by adjusting the dimensions of the dielectric,
In order to adjust the pass bandwidth, it is general to adjust the coupling between the resonator units.
【０００７】通過帯域幅を調整するためには、共振器ユ
ニット間の容量性結合を調整することが必要となる。結
合容量を大きくすれば通過帯域幅は広がり、逆に小さく
すれば通過帯域幅は狭まる。しかし、上記の構造の誘電
体フィルタにおいては、接着後に電極を加工することは
できないので調整が難しくなる問題がある。In order to adjust the pass bandwidth, it is necessary to adjust the capacitive coupling between the resonator units. Increasing the coupling capacitance increases the passband width, while decreasing the coupling capacitance narrows the passband. However, in the dielectric filter having the above structure, there is a problem that the adjustment is difficult because the electrodes cannot be processed after bonding.
【０００８】本発明は、上記のような内部に結合容量を
得る導体膜を有する誘電体フィルタの通過帯域幅の調整
を少ない加工工数で可能とする誘電体フィルタの帯域幅
調整方法を提供するものである。The present invention provides a method of adjusting the bandwidth of a dielectric filter which allows the adjustment of the pass bandwidth of the dielectric filter having a conductor film for obtaining a coupling capacitance as described above with a small number of processing steps. It is.
【０００９】[0009]
【課題を解決するための手段】本発明は、容量結合用の
接着面の電極に誘電体基板を介して対向する外導体の一
部を除去することによって、上記の課題を解決して通過
帯域幅を調整するものである。SUMMARY OF THE INVENTION The present invention solves the above problems by removing a part of an outer conductor facing an electrode on a bonding surface for capacitive coupling via a dielectric substrate. The width is adjusted.
【００１０】すなわち、複数の平行な凹溝を具えた誘電
体基板の凹溝のある表面に平板の誘電体基板が接着さ
れ、凹溝の部分に内導体が、凹溝の開口しない表面と端
面に外導体が、凹溝の開口する端面の一方に短絡導体が
形成され、凹溝の開口する他方の端面を開放端面とし、
隣接する内導体にそれぞれ接続されて誘電体基板の接着
面で近接して対向する導体膜によって容量性の結合を得
る誘電体フィルタの帯域幅調整方法において、上記接着
面で近接して対向する導体膜に対向する外導体の一部を
除去することに特徴を有するものである。That is, a flat dielectric substrate is adhered to a surface of a dielectric substrate having a plurality of parallel grooves, and an inner conductor is provided at a portion of the groove, and an inner surface and an end face of the groove are not opened. An outer conductor, a short-circuit conductor is formed on one of the open end faces of the concave groove, and the other open end face of the concave groove is an open end face,
In a method of adjusting the bandwidth of a dielectric filter, which is connected to an adjacent inner conductor and obtains capacitive coupling by a conductor film closely opposed on an adhesive surface of a dielectric substrate, conductors which are closely opposed on the adhesive surface The feature is that a part of the outer conductor facing the film is removed.
【００１１】[0011]
【作用】結合容量を得るための電極となる導体膜間には
電気力線が存在しており、その一部は外導体の導体膜に
結合してアース電位に落ちている。接合面の導体膜に誘
電体基板を介して対向している外導体の一部を除去する
ことによって、アース電位に結合する電気力線を少なく
して結合を大きくするもので、これによって通過帯域幅
を広げることができる。A line of electric force exists between conductor films serving as electrodes for obtaining a coupling capacitance, and a part of the lines of force is coupled to the conductor film of the outer conductor and drops to the ground potential. By removing a part of the outer conductor facing the conductor film on the bonding surface via the dielectric substrate, the lines of electric force that are coupled to the ground potential are reduced, and the coupling is increased. The width can be expanded.
【００１２】[0012]
【実施例】以下、図面を参照して、本発明の実施例につ
いて説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１３】図１は、本発明の実施例を示す斜視図であ
る。凹溝を有する誘電体基板10の凹溝12のある表面に平
板の誘電体基板11を接着して一体化したもので、凹溝12
の部分に導体膜を形成して内導体13とし、外周面にも導
体膜を形成して外導体14とする。図示しないが、下側の
凹溝の開口する端面には短絡導体が形成されて１／４波
長ＴＥＭ共振の誘電体フィルタが構成される。FIG. 1 is a perspective view showing an embodiment of the present invention. A flat dielectric substrate 11 is bonded to and integrated with the surface of the dielectric substrate 10 having the concave groove 12 on which the concave groove 12 is provided.
A conductor film is formed on the portion (2) to form an inner conductor 13, and a conductor film is also formed on the outer peripheral surface to form an outer conductor 14. Although not shown, a short-circuit conductor is formed on the open end face of the lower concave groove to constitute a quarter-wave TEM resonance dielectric filter.
【００１４】二枚の誘電体基板10、11の接着面には図２
に示した例と同様に、内導体（共振器）間の容量性の結
合を得るための導体膜と入出力端子と接続あるいは容量
結合される導体膜が形成されている。これらの導体膜は
誘電体基板の接着前に形成しておき、接着後の内導体や
端子電極の導体膜の形成の際に接続されるようにしてお
く。FIG. 2 shows the adhesion between the two dielectric substrates 10 and 11.
As in the example shown in (1), a conductor film for obtaining capacitive coupling between inner conductors (resonators) and a conductor film to be connected or capacitively coupled to input / output terminals are formed. These conductor films are formed before bonding the dielectric substrate, and are connected when forming the conductor film of the inner conductor and the terminal electrode after bonding.
【００１５】本発明による誘電体フィルタにおいては、
結合容量を得るために接着面に生成された導体膜に対向
する部分の外導体14の一部を除去して、誘電体が露出す
る部分15を形成する。この外導体の除去は誘電体フィル
タの通過帯域特性を測定しながら通常の研磨手段によっ
て行うことができる。所望の通過帯域幅が得られるま
で、研磨して外導体14の導体膜を除去することによって
行う。In the dielectric filter according to the present invention,
In order to obtain a coupling capacitance, a portion of the outer conductor 14 facing the conductor film formed on the bonding surface is partially removed to form a portion 15 where the dielectric is exposed. The removal of the outer conductor can be carried out by ordinary polishing means while measuring the pass band characteristics of the dielectric filter. Polishing is performed to remove the conductor film of the outer conductor 14 until a desired pass bandwidth is obtained.
【００１６】容量結合を得る電極は誘電体基板10と誘電
体基板11の接着面に形成されるので、通常、平板の誘電
体基板11側の外導体を除去する方法によって調整が可能
となる。もちろん、凹溝のある誘電体基板10側の外導体
を除去してもよい。また、誘電体フィルタでは開放端面
側で容量結合が大きくなるので、結合容量を得る導体膜
も開放端面側に形成する。したがって、外導体の除去も
開放端面側で行うことによって調整の効果を上げること
ができる。Since the electrode for obtaining the capacitive coupling is formed on the bonding surface between the dielectric substrate 10 and the dielectric substrate 11, the adjustment can be usually performed by removing the outer conductor on the flat dielectric substrate 11 side. Of course, the outer conductor on the side of the dielectric substrate 10 having the concave groove may be removed. In the case of a dielectric filter, capacitive coupling is increased on the open end face side. Therefore, a conductor film for obtaining coupling capacitance is also formed on the open end face side. Therefore, the effect of adjustment can be improved by removing the outer conductor on the open end face side.
【００１７】本発明による誘電体フィルタの帯域幅調整
方法を数百MHz 帯から１GHz 帯の誘電体フィルタに利用
したとき、開放端面側の外導体を僅かに削る程度で１MH
z 程度帯域幅を広げることができ、除去する面積を増や
して行くと30〜30MHz 程度まで調整することができた。When the method for adjusting the bandwidth of a dielectric filter according to the present invention is applied to a dielectric filter for a band of several hundred MHz to 1 GHz, the outer conductor on the open end face is slightly cut off at 1 MHz.
The bandwidth could be increased by about z, and as the area to be removed was increased, it could be adjusted to about 30 to 30 MHz.
【００１８】[0018]
【発明の効果】本発明によれば、誘電体フィルタの結合
容量を調整することが容易となり、通過帯域幅を広げる
ことが可能となる。特性を測定しながら調整ができるの
で、特性の調整のための工数を大幅に低減することがで
きる。According to the present invention, the coupling capacitance of the dielectric filter can be easily adjusted, and the pass band width can be widened. Since the adjustment can be performed while measuring the characteristics, the number of steps for adjusting the characteristics can be significantly reduced.
【図１】 本発明の実施例を示す斜視図FIG. 1 is a perspective view showing an embodiment of the present invention.
【図２】 従来の誘電体フィルタを示す斜視図FIG. 2 is a perspective view showing a conventional dielectric filter.
10、11：誘電体基板 15：外導体除去部 10, 11: Dielectric substrate 15: External conductor removal part
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平６−6107（ＪＰ，Ａ) 特開 平５−327312（ＪＰ，Ａ) 特開 平３−265302（ＪＰ，Ａ) 特開 昭57−73501（ＪＰ，Ａ) 実開 平１−67803（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) H01P 1/205──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-6107 (JP, A) JP-A-5-327312 (JP, A) JP-A-3-265302 (JP, A) JP-A-57- 73501 (JP, A) Hikaru 1-67803 (JP, U) (58) Field surveyed (Int. Cl. 6 , DB name) H01P 1/205
Claims (3)
凹溝のある表面に平板の誘電体基板が接着され、凹溝の
部分に内導体が、凹溝の開口しない表面と端面に外導体
が、凹溝の開口する端面の一方に短絡導体が形成され、
凹溝の開口する他方の端面を開放端面とし、隣接する内
導体にそれぞれ接続されて誘電体基板の接着面で近接し
て対向する導体膜によって容量性の結合を得る誘電体フ
ィルタの帯域幅調整方法において、上記接着面で近接し
て対向する導体膜に対向する外導体の一部を除去するこ
とを特徴とする誘電体フィルタの帯域幅調整方法。A flat dielectric substrate is bonded to a surface of a dielectric substrate provided with a plurality of parallel grooves, and an inner conductor is provided at a portion of the groove, and an inner surface and an end face of the groove are not opened. Outer conductor, a short-circuit conductor is formed on one of the open end faces of the concave groove,
The other end face where the concave groove is opened is set as an open end face, and the bandwidth adjustment of the dielectric filter which is connected to the adjacent inner conductor and obtains the capacitive coupling by the conductor film which is close to and opposed to the adhesive surface of the dielectric substrate. A method of adjusting a bandwidth of a dielectric filter, comprising: removing a part of an outer conductor facing a conductor film that is close to and opposed to the bonding surface.
導体を除去する請求項１記載の誘電体フィルタの帯域幅
調整方法。2. The method for adjusting the bandwidth of a dielectric filter according to claim 1, wherein the outer conductor is removed from the open end face toward the short-circuit end face.
去する請求項１または請求項２記載の誘電体フィルタの
帯域幅調整方法。3. The method for adjusting the bandwidth of a dielectric filter according to claim 1, wherein a part of the outer conductor on the side of the flat dielectric substrate is removed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5368495A JP2857078B2 (en) | 1995-02-17 | 1995-02-17 | Method of adjusting bandwidth of dielectric filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5368495A JP2857078B2 (en) | 1995-02-17 | 1995-02-17 | Method of adjusting bandwidth of dielectric filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08222909A JPH08222909A (en) | 1996-08-30 |
| JP2857078B2 true JP2857078B2 (en) | 1999-02-10 |
Family
ID=12949654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5368495A Expired - Lifetime JP2857078B2 (en) | 1995-02-17 | 1995-02-17 | Method of adjusting bandwidth of dielectric filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2857078B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010018614A (en) * | 1999-08-20 | 2001-03-05 | 원대철 | A dielectric filter |
-
1995
- 1995-02-17 JP JP5368495A patent/JP2857078B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08222909A (en) | 1996-08-30 |
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