JP2661006B2 - Dielectric filter - Google Patents
Dielectric filterInfo
- Publication number
- JP2661006B2 JP2661006B2 JP4186101A JP18610192A JP2661006B2 JP 2661006 B2 JP2661006 B2 JP 2661006B2 JP 4186101 A JP4186101 A JP 4186101A JP 18610192 A JP18610192 A JP 18610192A JP 2661006 B2 JP2661006 B2 JP 2661006B2
- Authority
- JP
- Japan
- Prior art keywords
- dielectric
- conductor
- face
- dielectric substrate
- open end
- 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
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、誘電体フィルタの構造
に係るもので、特にその共振器間の容量性の結合を小さ
くするための電極構造に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a dielectric filter, and more particularly to an electrode structure for reducing capacitive coupling between resonators.
【0002】[0002]
【従来の技術】UHF帯からマイクロ波帯といった高周
波領域において各種の誘電体フィルタが用いられてい
る。その中でも、貫通孔を具えてその部分に内導体が形
成され、外周面に外導体が形成されたTEM共振器を組
み合わせた誘電体フィルタが多く用いられている。個別
の共振器を接続して構成するものと、ブロックに一体化
されたものとがある。2. Description of the Related Art Various dielectric filters are used in a high frequency range such as a UHF band to a microwave band. Among them, a dielectric filter including a TEM resonator in which an inner conductor is formed in a portion having a through hole and an outer conductor is formed on an outer peripheral surface thereof is often used. There are a resonator configured by connecting individual resonators and a resonator integrated with a block.
【0003】それらの誘電体フィルタにおいては、通過
帯域特性を調整するために、共振器間の容量性の結合、
誘導性の結合を調整している。容量性の結合を弱めるた
めには、共振器間に結合調整孔を形成したり、更にその
孔に導体を挿入したりしている。In these dielectric filters, in order to adjust the pass band characteristics, capacitive coupling between resonators,
Regulates inductive binding. In order to weaken the capacitive coupling, a coupling adjustment hole is formed between the resonators, and a conductor is inserted into the hole.
【0004】誘電体フィルタの分野でも、小型化、薄型
化の要求があり、また、周波数帯の上昇に伴い波長が短
くなるために寸法も短くしなければならない。In the field of dielectric filters, there is also a demand for miniaturization and thinning, and the size must be shortened because the wavelength becomes shorter as the frequency band rises.
【0005】[0005]
【発明が解決しようとする課題】上記のように、小型
化、薄型化が進むと、共振器間の容量性の結合を小さく
するための構造も制約されることになり、簡単な構造で
容量性の結合を小さくすることのできる電極構造が必要
となる。As described above, as the size and thickness are reduced, the structure for reducing the capacitive coupling between the resonators is restricted, and the capacitance is reduced by a simple structure. An electrode structure that can reduce the sexual coupling is required.
【0006】また、共振器間の容量性の結合を弱めるた
めに、特別な部品を付加したり接続することは避けるこ
とが望ましい。It is also desirable to avoid adding or connecting special components to weaken the capacitive coupling between the resonators.
【0007】本発明は、このような課題を解決して、簡
単な構造、製造工程で、容量性の結合の小さい、すなわ
ち誘導性の結合を主とする誘電体フィルタを提供するも
のである。An object of the present invention is to solve the above problems and to provide a dielectric filter having a small capacitive coupling with a simple structure and a simple manufacturing process, that is, a dielectric filter mainly comprising an inductive coupling.
【0008】[0008]
【課題を解決するための手段】本発明は、誘電体ブロッ
クの内部に、外導体に接続された導体膜を配置し、この
導体膜をアースすることによって、上記の課題を解決す
るものである。The present invention solves the above-mentioned problems by disposing a conductor film connected to an outer conductor inside a dielectric block and grounding the conductor film. .
【0009】すなわち、二枚の誘電体基板が接着されて
複数の共振器が一体に形成された誘電体フィルタにおい
て、直線的に伸びる複数の平行な凹溝を具えた第一の誘
電体基板の、凹溝のある表面上に平板の第二の誘電体基
板が接着されて複数の貫通孔が形成された誘電体ブロッ
クの、貫通孔内の表面全体に内導体が形成され、第一の
誘電体基板と第二の誘電体基板の接着面に対向するそれ
ぞれの表面と、凹溝の伸びる方向に平行な両端面に外導
体が形成され、貫通孔の開口する端面の一方に短絡導体
が形成されて複数の共振器が誘電体ブロック内に一体に
構成され、少なくとも一方の誘電体基板の接着面に、凹
溝の間で開放端面から短絡端面の方向に伸び、開放端面
でアース電位に接続された導体パターンを具えたことに
特徴を有するものである。That is, in a dielectric filter in which a plurality of resonators are integrally formed by bonding two dielectric substrates, a first dielectric substrate having a plurality of linear grooves extending linearly is provided. An inner conductor is formed on the entire surface in the through hole of the dielectric block in which a plurality of through holes are formed by bonding a flat second dielectric substrate on the surface having the concave groove, and the first dielectric Outer conductors are formed on each surface of the body substrate and the second dielectric substrate facing the bonding surface and on both end surfaces parallel to the direction in which the concave groove extends, and a short-circuit conductor is formed on one of the end surfaces where the through holes are opened. The plurality of resonators are integrally formed in the dielectric block, and extend from the open end face to the short-circuit end face between the concave grooves on the adhesive surface of at least one dielectric substrate, and are connected to the ground potential at the open end face. Characterized by having a patterned conductor pattern A.
【0010】開放端面に露出した導体パターンから外導
体にかけて導体膜を形成して導体パターンをアース電位
に接続することができる。[0010] A conductor film can be formed from the conductor pattern exposed on the open end surface to the outer conductor, and the conductor pattern can be connected to the ground potential.
【0011】[0011]
【作用】共振器の開放端面側にアースされた導体パター
ンを形成するので、容量的な結合を小さくすることがで
き、その寸法、形状あるいは位置によって容量を調整し
て通過帯域特性を調整することができる。Since a grounded conductor pattern is formed on the open end face of the resonator, capacitive coupling can be reduced, and the passband characteristics can be adjusted by adjusting the capacitance according to its size, shape or position. Can be.
【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2は、本発明による誘電体フィルタの組
み立て前の状態を示す斜視図である。二本の平行な凹溝
24を具えた第一の誘電体基板21の凹溝24のある側に、平
板の第二の誘電体基板22をガラス等で接着する。これに
よって、平行な二本の貫通孔を具えた誘電体のブロック
が形成される。本発明においては、誘電体基板の接着面
にあらかじめ導体パターン26を形成しておく。この導体
パターン26は開放端面となる誘電体基板21の縁の部分か
ら短絡端面となる縁の方向に伸びるように形成し、二つ
の凹溝24の間の誘電体基板21の表面に形成する。FIG. 2 is a perspective view showing a state before assembling the dielectric filter according to the present invention. Two parallel grooves
A flat plate-shaped second dielectric substrate 22 is bonded to the side of the first dielectric substrate 21 having the groove 24 with the concave groove 24 using glass or the like. As a result, a dielectric block having two parallel through holes is formed. In the present invention, the conductor pattern 26 is formed in advance on the bonding surface of the dielectric substrate. The conductor pattern 26 is formed so as to extend from the edge portion of the dielectric substrate 21 serving as an open end face toward the edge serving as a short-circuit end face, and is formed on the surface of the dielectric substrate 21 between the two concave grooves 24.
【0014】図1は、第一の誘電体基板と第二の誘電体
基板を接着し、導体膜を形成した後の、本発明による誘
電体フィルタを示す斜視図である。図2の誘電体基板21
に対応する誘電体基板11と同じく誘電体基板22に対応す
る誘電体基板12が接着されてなる誘電体ブロックに二つ
の貫通孔15が形成された構造となっている。この貫通孔
15内の表面には内導体が形成され、その貫通孔15の伸び
る方向と平行な外周面には外導体17が形成されている。
図には示されないが貫通孔15の開口する一方の端面には
短絡導体が形成され、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 a dielectric filter according to the present invention after a first dielectric substrate and a second dielectric substrate are bonded and a conductor film is formed. The dielectric substrate 21 of FIG.
The structure has a structure in which two through holes 15 are formed in a dielectric block formed by bonding a dielectric substrate 12 corresponding to a dielectric substrate 22 similarly to the dielectric substrate 11 corresponding to. This through hole
An inner conductor is formed on a surface inside 15, and an outer conductor 17 is formed on an outer peripheral surface parallel to a direction in which the through hole 15 extends.
Although not shown in the drawing, a short-circuit conductor is formed on one end face of the opening of the through-hole 15 to constitute a quarter-wave TEM resonant dielectric filter.
【0015】図2で示した接合面に形成された導体パタ
ーン26は、開放端面で導体膜13と接続される。この導体
膜13は外導体17と接続されており、これによって、導体
パターン26は外導体17と導通され、アース電位に接続さ
れたことになる。なお、端子電極18は、貫通孔15の伸び
る方向に平行な端面だけでなく、これに隣接する表面に
まで跨がって形成してある。これは、プリント配線板上
で面実装を可能にするためである。もちろん、端子電極
18は外導体とは絶縁しなければならない。The conductor pattern 26 formed on the joint surface shown in FIG. 2 is connected to the conductor film 13 at the open end face. The conductor film 13 is connected to the outer conductor 17, whereby the conductor pattern 26 is electrically connected to the outer conductor 17 and is connected to the ground potential. Note that the terminal electrode 18 is formed not only on the end surface parallel to the direction in which the through hole 15 extends, but also on the surface adjacent thereto. This is to enable surface mounting on a printed wiring board. Of course, the terminal electrode
18 must be insulated from the outer conductor.
【0016】図2の例では、導体パターン26は凹溝を有
する誘電体基板21の側に形成されているが、実際に製造
する際には、図3のように、平板の誘電体基板32の表面
に形成する方が製造が容易である。なお、このときに共
振器間の結合を調整する導体膜36とともに、入出力結合
用の電極となる導体パターン39を併せて形成しておくと
よい。In the example shown in FIG. 2, the conductor pattern 26 is formed on the side of the dielectric substrate 21 having a concave groove. However, in actual manufacturing, as shown in FIG. It is easier to manufacture on the surface. At this time, a conductor pattern 39 serving as an input / output coupling electrode may be formed together with the conductor film 36 for adjusting the coupling between the resonators.
【0017】なお、上記の例は、二つの共振器の結合を
調整するものであるが、3個以上の共振器を具えた誘電
体フィルタにも同様に適用できる。Although the above example adjusts the coupling between two resonators, it can be similarly applied to a dielectric filter having three or more resonators.
【0018】図4は、本発明による誘電体フィルタの特
性の説明図である。凹溝を設けた厚さ1.8mm の第一の誘
電体基板と厚さ0.9mm の第二の誘電体基板を接着したも
ので、凹溝の中心間隔は2.5mm 、幅1mm 、深さ0.9mm と
したもので、開放端面の寸法が2.7mm ×6.5mm の誘電体
フィルタの例である。解放端面から短絡端面までの寸法
は中心周波数によって決まるが、1500MHz 帯では約9.5m
m となる。この寸法で所定の電極を形成して、中心周波
数が1575.4MHz で、挿入損失が約2dBの誘電体フィルタ
が得られた。共振器間の容量性の結合を弱める導体パタ
ーンを形成しないときには、通過帯域の低域側と高域側
の減衰特性がほぼ対称になるのに対し、図に示されたよ
うに、本発明による誘電体フィルタでは通過帯域の高域
側の減衰特性が急峻となっている。FIG. 4 is an explanatory diagram of characteristics of the dielectric filter according to the present invention. A 1.8mm thick first dielectric substrate with a concave groove and a 0.9mm thick second dielectric substrate are bonded together.The center distance between the concave grooves is 2.5mm, width 1mm, depth 0.9mm. This is an example of a dielectric filter having an open end face of 2.7 mm × 6.5 mm. The dimension from the open end to the short-circuited end is determined by the center frequency.
m. By forming predetermined electrodes with these dimensions, a dielectric filter having a center frequency of 1575.4 MHz and an insertion loss of about 2 dB was obtained. When the conductor pattern for weakening the capacitive coupling between the resonators is not formed, the attenuation characteristics on the low band side and the high band side of the pass band become almost symmetrical. In the dielectric filter, the attenuation characteristic on the high band side of the pass band is steep.
【0019】[0019]
【発明の効果】本発明によれば、共振器間の容量性の結
合の弱い、すなわち誘導性の結合が主となる誘電体フィ
ルタを得ることが容易となり、周波数帯域通過特性をそ
れによって調整することができる。しかも、特別な部品
も必要とせず、導体パターンの形成のみで済むので安価
な誘電体フィルタが得られる。According to the present invention, it is easy to obtain a dielectric filter in which capacitive coupling between resonators is weak, that is, inductive coupling is predominant, and the frequency band-pass characteristic is adjusted accordingly. be able to. Moreover, no special parts are required, and only the formation of the conductor pattern is sufficient, so that an inexpensive dielectric filter can be obtained.
【図1】 本発明の実施例(組立後)を示す斜視図FIG. 1 is a perspective view showing an embodiment (after assembly) of the present invention.
【図2】 本発明の実施例(組立前)を示す斜視図FIG. 2 is a perspective view showing an embodiment (before assembly) of the present invention.
【図3】 本発明の他の実施例を示す斜視図FIG. 3 is a perspective view showing another embodiment of the present invention.
【図4】 本発明による誘電体フィルタの特性の説明図FIG. 4 is an explanatory diagram of characteristics of a dielectric filter according to the present invention.
11、 21 :(第一の)誘電体基板 12、22、32:(第二の)誘電体基板 26、36 :導体パターン 11, 21: (first) dielectric substrate 12, 22, 32: (second) dielectric substrate 26, 36: conductor pattern
Claims (2)
振器が一体に形成された誘電体フィルタにおいて、直線
的に伸びる複数の平行な凹溝を具えた第一の誘電体基板
の、凹溝のある表面上に平板の第二の誘電体基板が接着
されて複数の貫通孔が形成された誘電体ブロックの、貫
通孔内の表面全体に内導体が形成され、第一の誘電体基
板と第二の誘電体基板の接着面に対向するそれぞれの表
面と、凹溝の伸びる方向に平行な両端面に外導体が形成
され、貫通孔の開口する端面の一方に短絡導体が形成さ
れて複数の共振器が誘電体ブロック内に一体に構成さ
れ、少なくとも一方の誘電体基板の接着面に、凹溝の間
で開放端面から短絡端面の方向に伸び、開放端面でアー
ス電位に接続された導体パターンを具えたことを特徴と
する誘電体フィルタ。1. A dielectric filter in which a plurality of resonators are integrally formed by bonding two dielectric substrates to each other, wherein the first dielectric substrate includes a plurality of parallel concave grooves extending linearly. An inner conductor is formed on the entire surface in the through hole of the dielectric block in which a plurality of through holes are formed by bonding a flat second dielectric substrate on the surface having the concave groove, and the first dielectric An outer conductor is formed on each surface of the body substrate and the second dielectric substrate facing the bonding surface, and both end surfaces parallel to the extending direction of the concave groove, and a short-circuit conductor is formed on one of the open end surfaces of the through hole. The plurality of resonators are integrally formed in the dielectric block, and extend from the open end face to the short-circuit end face between the concave grooves on the adhesive surface of at least one dielectric substrate, and are connected to the ground potential at the open end face. A dielectric filter, comprising: a conductive pattern.
続する導体膜を具えた請求項1記載の誘電体フィルタ。2. The dielectric filter according to claim 1, further comprising a conductor film connecting the outer conductor and the conductor pattern on the open end face.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4186101A JP2661006B2 (en) | 1992-06-19 | 1992-06-19 | Dielectric filter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4186101A JP2661006B2 (en) | 1992-06-19 | 1992-06-19 | Dielectric filter |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH066108A JPH066108A (en) | 1994-01-14 |
JP2661006B2 true JP2661006B2 (en) | 1997-10-08 |
Family
ID=16182385
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4186101A Expired - Fee Related JP2661006B2 (en) | 1992-06-19 | 1992-06-19 | Dielectric filter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2661006B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4021773B2 (en) | 2003-01-17 | 2007-12-12 | 東光株式会社 | Waveguide type dielectric filter and manufacturing method thereof |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61156903A (en) * | 1984-12-27 | 1986-07-16 | Sony Corp | Dielectric filter |
JPH0537522Y2 (en) * | 1987-06-24 | 1993-09-22 | ||
JPH0758873B2 (en) * | 1988-08-01 | 1995-06-21 | 富士通株式会社 | Waveguide hybrid and high-frequency power amplifier using the same |
JPH04312002A (en) * | 1991-04-11 | 1992-11-04 | Murata Mfg Co Ltd | Dielectric filter |
-
1992
- 1992-06-19 JP JP4186101A patent/JP2661006B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH066108A (en) | 1994-01-14 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |