JPS58104501A - Dielectric filter - Google Patents

Abstract

PURPOSE:To attain sure electromagnetic shield, small size and light weight, by providing a conductor for electrode shield imbedding a gap between opposing surfaces along the circumference of the opposing surfaces between both dielectric plates. CONSTITUTION:A resonance conductor 5 and an input/output line 4 are provided between two dielectric plates 1, 1. All the outer surface of the plate 1 other than the opposing surface to the counter plate 1 is covered with a external conductor 2 by plating or metallizing processing. The conductor 2 is soldered to a short- circuit section 3 for electric connection. An electromagnetic shield conductor 6 having a notch for passing input and output terminals is provided along the upper and both side ridges of the counter surface between the plates. The gap between the plates 1 is almost completely imbedded with the conductor 6 along the upper and both side ridges and the conductor 5 is electromagnetically shielded externally. Without using a metallic housing for electromagnetic shield a filter can be shielded electromagnetically from the outside, to attain excellent characteristics without being affected with external disturbance. Further, small size and light weight can be attained.

Description

【発明の詳細な説明】 （１）発明の技術分野 本発明はマイク四波帯に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 (1) Technical Field of the Invention The present invention relates to a dielectric filter used in a microphone four-wave band.

（粉　技術の背景 マイクｑ波無線装置等に使用される誘電体フィルタとし
て外導体である筐体内の誘電体内にフィルタ特性に対応
した所定の間隔で共振用導体（内導体）を配置した同軸
型フィルタは公知である。このような同軸蓋フィルタは
大型で重＜、１九焼結体である誘電体に高精度で内導体
用の孔加工をしなければならず製造が容易ではない、こ
のような点を抜食するため誘電体表面ＫＩＩ数の共振用
導体を設は孔加工を不要としたマイク藁ストリップライ
ン型フィルタが開発されている。このようなマイクロス
トリップライン製フィルタにおいてもさらＫなおその小
型軽量化が要望されている。(Powder Technology Background) A coaxial type dielectric filter used in microphone Q-wave radio equipment, etc. has resonant conductors (inner conductors) arranged at predetermined intervals corresponding to the filter characteristics inside the dielectric inside the housing, which is the outer conductor. Filters are well known.Such coaxial lid filters are large and heavy, and are not easy to manufacture because holes for inner conductors must be formed with high precision in the dielectric material, which is a sintered body. In order to eliminate such points, a micro-straw stripline type filter has been developed in which KII number of resonant conductors are installed on the dielectric surface and no hole drilling is required. In addition, there is a demand for a smaller size and lighter weight.

（３）従来技術と問題点 第一１図は従来の誘電体フィルタの斜視図、第２図はそ
の共振用導体の平面図である。この誘電体フィルタはマ
イクロストリップライン！！１フィルタの誘電体板表面
の共振用導体を別の誘電体板で覆い２枚の誘電体板間〈
共振用導体を挾む構成としてフィルタ特性の向上を図っ
ている４のである。(3) Prior Art and Problems FIG. 1 is a perspective view of a conventional dielectric filter, and FIG. 2 is a plan view of its resonance conductor. This dielectric filter is a microstrip line! ! The resonance conductor on the surface of the dielectric plate of one filter is covered with another dielectric plate, and the distance between the two dielectric plates is
No. 4 is designed to improve the filter characteristics by having a configuration in which the resonant conductor is sandwiched.

８枚の誘電体板１．１間に共振用導体５および入出力用
結合線路４が装着される。各共振用導体５および入出力
用結合線路４はその下部において短絡部３を、介して一
体化され電気的に導通している。A resonance conductor 5 and an input/output coupling line 4 are installed between eight dielectric plates 1.1. Each of the resonance conductors 5 and the input/output coupling line 4 are integrated and electrically connected via the short-circuit portion 3 at their lower portions.

各誘電体板１の対向面との反対側表面および下端面はメ
ッキあるいは厚膜等によりメタライズされ外部導体とが
形成される０両誘電体板ｌの外部導体２は短絡部３に対
しハンダ接合され電気的に接続される。各共振用導体す
は共振波長の四分の一波長の奇数倍の長さに形成され、
隣接する共振用導体間距離はフィルタ特性に対応した結
合強度となる所定の距離に定められる。この共振用導体
間の間隔は同一特性の同軸型フィルタの場合に比べ小さ
いため誘電体板は同軸型フィルタの誘電体板より小ｆＪ
ｉＫなり、また孔加工等も不要である丸め製造も容易に
なる。しかしながら、このような誘電体フィルタにおい
°ては、各共振用導体に対する電磁シールドを確実にし
て外乱の影醤をなくしフィルタ特性を向上させる九めに
全体を金属筐体内に収容する必要がある。従って、ｌＩ
電体自体は小型軽量化し、Ｉｌ造も容易になる反面、金
属筐体を必要とするためフィルタ装置全体としての形状
の、１．１．・ 小型４Ｖ、は充分達成されない。The surface opposite to the facing surface and the lower end surface of each dielectric plate 1 are metalized by plating or thick film to form an external conductor.The external conductor 2 of each dielectric plate 1 is soldered to the short circuit part 3. and electrically connected. Each resonant conductor is formed to have a length that is an odd number times a quarter wavelength of the resonant wavelength,
The distance between adjacent resonant conductors is determined to be a predetermined distance that provides a coupling strength corresponding to the filter characteristics. The spacing between these resonance conductors is smaller than that of a coaxial filter with the same characteristics, so the dielectric plate has a smaller fJ than the dielectric plate of a coaxial filter.
It becomes easy to manufacture the product in a rounded shape, which requires no drilling or the like. However, in such a dielectric filter, it is necessary to house the entire filter in a metal housing in order to ensure electromagnetic shielding for each resonant conductor, eliminate the effects of disturbance, and improve filter characteristics. Therefore, lI
Although the electric body itself is smaller and lighter and easier to construct, it requires a metal casing, so the shape of the filter device as a whole is affected by 1.1. - Compact 4V is not fully achieved.

（荀　発明の目的 本発明は上記の点に僑みなされたものであって、金属筐
体を用いることなく電磁シールドを確実に行い小型軽量
化を図った誘電体フィルタの提供を目的とする。(Xun) Purpose of the Invention The present invention has been made in consideration of the above points, and an object of the present invention is to provide a dielectric filter that can ensure electromagnetic shielding without using a metal casing and can be made smaller and lighter.

（５）発明の構成 □　この目的を達成するため本発明に係ゐ誘電体フィル
タは２枚の誘電体板間に共振用導体を挾み。(5) Structure of the invention □ In order to achieve this object, the dielectric filter according to the present invention has a resonant conductor sandwiched between two dielectric plates.

両誘電体板の相互に対向すゐ面以外の全外表面を外部用
導体でメタライズし１両誘電体板の上記外部導体同士を
電気的に接続し５両誘電体板間の対向面の周縁に沿って
該対向面間の隙間を場める電磁シールド用導体を設けて
いる。The entire outer surface of both dielectric plates other than the mutually opposing surfaces is metalized with an external conductor, and the external conductors of one dielectric plate are electrically connected to each other, and the peripheral edges of the opposing surfaces between the five dielectric plates are An electromagnetic shielding conductor is provided along which a gap is provided between the opposing surfaces.

（６）発明の実施例 第３図は本発明に係る誘電体フィルタの斜視ＷＪ、第４
′図はその共振用導体の平面図である。２枚の誘電体板
１．１間に共振用導体Ｓおよび入出力用結合−路４ｉ装
着される。各共振用導体Ｓおよび入出力用結審゛線路４
はその下部において短絡部３を介して一体化され電気的
に導通している。(6) Embodiment of the Invention FIG. 3 shows a perspective view WJ of a dielectric filter according to the present invention.
Figure ' is a plan view of the resonant conductor. A resonance conductor S and an input/output coupling path 4i are installed between two dielectric plates 1.1. Each resonance conductor S and input/output terminal line 4
are integrated and electrically connected via the short-circuit part 3 at the lower part thereof.

各誘電体板１は相手側の誘電体板との対向面以外の全外
表面をメッキあるいは厚膜勢のメタライズ処置により外
部用導体２で覆われる０両誘電体板１の外部導体２は短
絡部３に対しハンダ接合され電気的に＠続される。各共
振用導体５は共振液長の四分の一波長の奇数倍、の長さ
に形成され一隣接する共振用導体間距離はフィルタ特性
に対応した結合強度となる所定の距離に定められる０両
誘電体板間の対向面の上縁および両側縁に沿って入出力
用端子の通過用切欠部を有する電磁シールド用導体６が
設けられる。この電磁シールド用導体６により両幹電体
板間の隙間がその上縁および両側縁に沿ってほぼ完全に
濶められ共振用導ｔ！Ｉ−ｓ！ｉ電磁的に外部からシー
ルドされる。フィルタの通過周液数帯域のロスを少くし
特性を向上させるために共振用導体５は高周波電１１に
対して十分な厚みを持たせることが望壇しい、この光め
、誘電体板上に−Ｈ共振用導体５ｓ入出力用結合線路４
．ｆＩｉ絡部３．および電磁シールド用導体６．０形状
の導体パターンを密着形威し、仁の導体パターン上にこ
れらと同形状の・金属板をハンダ接合あるいは導電ペー
スト等により接着して両鍔電体板間に、金属板層を密着
して装着することが望ましい、上記導体パターンを形成
するＫｒｊｉｌ電体板を無電郷メツ命後所望形状にエツ
チングを行う方法あるいは厚膜ＩＩＩＫより所望形状の
導体パターンを誘電体板上に密着して形成することがで
きる。Each dielectric plate 1 is covered with an external conductor 2 by plating or thick film metallization on the entire outer surface other than the surface facing the other dielectric plate 1.The outer conductor 2 of both dielectric plates 1 is short-circuited. It is soldered to part 3 and electrically connected. Each resonant conductor 5 is formed to have a length that is an odd multiple of a quarter wavelength of the resonant liquid length, and the distance between adjacent resonant conductors is determined to be a predetermined distance that provides a coupling strength corresponding to the filter characteristics. An electromagnetic shielding conductor 6 having a notch through which an input/output terminal passes is provided along the upper edge and both side edges of the opposing surface between both dielectric plates. With this electromagnetic shielding conductor 6, the gap between both main power plates is almost completely covered along its upper edge and both side edges, and the resonance conductor 6 is completely covered. I-s! iElectromagnetically shielded from the outside. In order to reduce the loss in the frequency band passing through the filter and improve the characteristics, it is desirable that the resonant conductor 5 has a thickness sufficient for the high-frequency wave 11.This light is placed on the dielectric plate. -H resonance conductor 5s input/output coupling line 4
．． fIi connection part 3. Then, a conductor pattern of 6.0 shape for electromagnetic shielding is closely formed, and a metal plate of the same shape is bonded on top of the conductor pattern with solder or conductive paste, etc., between the two flange conductor plates. It is preferable to attach the metal plate layers in close contact with each other, by etching the Krjil electric plate forming the conductor pattern into the desired shape after electroless etching, or by etching the conductor pattern in the desired shape from a thick film IIIK on the dielectric. It can be formed in close contact with the board.

第Ｓ図は本発明に係る誘電体フィルタの廟の例の斜視図
であり、第６図はその共振用導体の平面図である。この
例（おいては、入出力用結合線路−は誘電体板ＩＫ設は
皮孔９を介してコネクタγの内導体と接続される。コネ
クタ１が挿入される孔９は位置精度がラフでよいため製
作は面一ではない、ｅ、のような構成においては、電磁
シールド用導体６は誘電体板１の上縁および南憫縁に沿
って連続的に一体的に形成することができ両誘電体板間
の隙間はその外周縁で完全に壌められる。FIG. S is a perspective view of an example of a dielectric filter according to the present invention, and FIG. 6 is a plan view of its resonance conductor. In this example, the input/output coupling line is connected to the inner conductor of the connector γ through the skin hole 9 of the dielectric plate IK.The positional accuracy of the hole 9 into which the connector 1 is inserted is rough. In a configuration such as e, where the fabrication is not flush because of the good structure, the electromagnetic shielding conductor 6 can be formed continuously and integrally along the upper edge and the southern edge of the dielectric plate 1. The gap between the dielectric plates is completely filled at their outer edges.

第７図は本発明に係る誘電体フィルタの更に別の例の斜
視図であり、第８図はその共振用導体の平面図である。FIG. 7 is a perspective view of still another example of the dielectric filter according to the present invention, and FIG. 8 is a plan view of its resonance conductor.

ここではインタディジタル蓋のフィルタに本発明を適用
したものを示し、上述の実施例と一様の効果を奏する。Here, a filter of an interdigital lid to which the present invention is applied is shown, and the same effect as the above-mentioned embodiment is achieved.

（η　発明の効果　　　　　　　　　　　゛以上発明し
たよう（２本発明に係る誘電体フィルタにおいては、２
枚の誘電体板間に共振用導体を挾み各誘電体板の対向面
以外の全外表面を外部導体で覆っているためこの外部導
体が電磁シールド効果を果し、また両誘電体板間の隙間
は電磁シールド用導体で纏められるため共振用導体は電
磁シールド効果を有する導体では埋完全に覆われる。従
って、別に電磁シールド用金属筐体を用いることなくフ
ィルタを外部から電磁的にシールドすることができ外乱
の影響を受けない良好な特性でしかも小型軽量の誘電体
フィルタが得られる。(η Effect of the invention ゛As invented above (2) In the dielectric filter according to the present invention, 2
A resonant conductor is sandwiched between two dielectric plates, and the entire outer surface of each dielectric plate other than the facing surface is covered with an outer conductor, so this outer conductor provides an electromagnetic shielding effect. Since the gap is filled with the electromagnetic shielding conductor, the resonance conductor is completely covered with the conductor having an electromagnetic shielding effect. Therefore, it is possible to electromagnetically shield the filter from the outside without using a separate metal casing for electromagnetic shielding, and it is possible to obtain a small and lightweight dielectric filter with good characteristics that are not affected by external disturbances.

また、第５図および第６図に示した実施例のように電磁
シールド用導体６を連続的に一体的に形成することによ
り電磁シールド効果を高めることができるばかりでなく
、電磁シールド用導体６の分断による部品点数の増加や
組立時の位置合せの必要性を伴うことなく容易く金属板
を両誘電体板間の所定位置に配置しフィルタを朝立てる
ことができる。Further, by forming the electromagnetic shielding conductor 6 continuously and integrally as in the embodiment shown in FIGS. 5 and 6, not only can the electromagnetic shielding effect be enhanced, but also the electromagnetic shielding conductor 6 The metal plate can be easily placed at a predetermined position between the two dielectric plates and the filter can be erected in the morning without increasing the number of parts due to separation and without having to perform alignment during assembly.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来の誘電体フィルタの一部切欠き斜視図、第
２図はその共振用導体の平面図、第３図は本発明の一実
施例の一部切欠き斜視図、第４図はその共振用導体の平
面図％＠５図は本発明の別の実施例の一部切欠き斜視図
、第６図はその共振用導体の平面図、第７図は本発明の
更に別の実施例の一部切欠き斜視図、第８図はその共振
用導体の平面図である。 １・・・誘電体板、　　　２・・・外部用導体。 ５・・・共振用導体、　　６・・・電磁シールド用導体
。 特許出願人 富士通株式会社 特許出願代理人 弁理士　實　木　　　　朗 弁理士　西　舘　和　之 弁理士　内　１）幸　男 弁理士　山　　口　昭　之 第１図 第５図FIG. 1 is a partially cutaway perspective view of a conventional dielectric filter, FIG. 2 is a plan view of its resonance conductor, FIG. 3 is a partially cutaway perspective view of an embodiment of the present invention, and FIG. 4 is a plan view of the resonance conductor %@5 is a partially cutaway perspective view of another embodiment of the present invention, FIG. 6 is a plan view of the resonance conductor, and FIG. A partially cutaway perspective view of the embodiment, and FIG. 8 is a plan view of the resonance conductor. 1... Dielectric plate, 2... External conductor. 5... Conductor for resonance, 6... Conductor for electromagnetic shielding. Patent Applicant Fujitsu Limited Patent Application Agent Patent Attorneys Akira Minori Patent Attorney Kazuyuki Nishidate Patent Attorneys 1) Yukio Patent Attorney Akiyuki Yamaguchi Figure 1 Figure 5

Claims (1)

【特許請求の範囲】[Claims] １．２枚の誘電体板間に共振用導体を挾み１両誘電体板
の相互に対向する面板外の全外表面を接地導体でメタラ
イズし１両誘電体板の上記接地導体同士を電気的Ｋｍ続
し、両誘電体板間の対向面の周縁に沿って鋏対向面間の
隙間を壌めるシールド用導体を設けた誘電体フィルタ。1. Sandwich a resonance conductor between two dielectric plates, metallize the entire outer surface of one dielectric plate other than the mutually opposing face plates with a ground conductor, and connect the ground conductors of one dielectric plate to each other with electricity. A dielectric filter is provided with a shielding conductor which is connected to the target Km and extends along the periphery of the opposing surfaces between both dielectric plates to widen the gap between the surfaces facing the scissors.