JPH03175808A - Filter input/output matching circuit - Google Patents
Filter input/output matching circuitInfo
- Publication number
- JPH03175808A JPH03175808A JP31667189A JP31667189A JPH03175808A JP H03175808 A JPH03175808 A JP H03175808A JP 31667189 A JP31667189 A JP 31667189A JP 31667189 A JP31667189 A JP 31667189A JP H03175808 A JPH03175808 A JP H03175808A
- Authority
- JP
- Japan
- Prior art keywords
- matching circuit
- input
- output
- frequency filter
- output matching
- 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.)
- Pending
Links
- 229910000859 α-Fe Inorganic materials 0.000 claims 1
- 239000003990 capacitor Substances 0.000 abstract description 6
- 230000008878 coupling Effects 0.000 abstract description 5
- 238000010168 coupling process Methods 0.000 abstract description 5
- 238000005859 coupling reaction Methods 0.000 abstract description 5
- 239000002184 metal Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は高周波フィルタの入出力整合回路に関し、特に
その入力側整合回路・出力側整合回路間の電磁結合を軽
減する目的で磁気シールドチップインダクタを使用した
フィルタ入出力整合回路に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an input/output matching circuit of a high frequency filter, and in particular, a magnetically shielded chip inductor is used for the purpose of reducing electromagnetic coupling between the input side matching circuit and the output side matching circuit. This paper relates to a filter input/output matching circuit using a filter input/output matching circuit.
従来この種の高周波フィルタ入出力整合回路は、そのイ
ンダクタンス素子として、巻線で作ったインダクタに金
属ケースを被せた物を使っている。Conventionally, this type of high-frequency filter input/output matching circuit uses, as its inductance element, an inductor made of wire wound and covered with a metal case.
しかし最近では、機器の小型化のために上記インタフタ
に代わって、磁気シールドが施されていないチップイン
ダクタが使われているようになってきている。However, recently, in order to downsize devices, chip inductors without magnetic shielding have been used instead of the above-mentioned interfacers.
」一連したチップインダクタを使った高周波フィルタ入
出力整合回路では、チップインダクタを介しての入出力
電磁結合が起こり易く、フィルタ自身が持つ本来の減衰
特性を生かせないという欠点がある。（第２図参照）ま
たこの欠点を補うために入力側整合回路又は出力側整合
回路の全体或いは一部を金属性シールドカバーで覆う必
要がある。A high-frequency filter input/output matching circuit using a series of chip inductors has the disadvantage that input/output electromagnetic coupling easily occurs through the chip inductors, and the original attenuation characteristics of the filter itself cannot be utilized. (See FIG. 2) In order to compensate for this drawback, it is necessary to cover all or part of the input-side matching circuit or the output-side matching circuit with a metal shield cover.
（第３図参照）
〔課題を解決するための手段〕
本発明は高周波フィルタの入出力整合回路中に少なくと
も１つの磁気シールＦチップインダクタな有している。(See FIG. 3) [Means for Solving the Problems] The present invention includes at least one magnetically sealed F-chip inductor in the input/output matching circuit of a high frequency filter.
次に、本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.
第１図は本発明の一実施例の回路図である。ｌは高周波
フィルタ、２はその入力側整合回路、３は出力側整合回
路である。４〜７はこれら整合回路を構成する素子であ
り、４及び５は第１及び第２キヤパシタ、６及び７は第
１及び第２の磁気シールドチップインダクタである。FIG. 1 is a circuit diagram of an embodiment of the present invention. 1 is a high frequency filter, 2 is a matching circuit on its input side, and 3 is a matching circuit on its output side. 4 to 7 are elements constituting these matching circuits, 4 and 5 are first and second capacitors, and 6 and 7 are first and second magnetically shielded chip inductors.
第２図は高周波フィルタの減衰特性例（模式％式％
第３図は高周波フィルタの出力側整合回路を金属性シー
ルドケースで覆った例の断面図を示す。FIG. 2 shows an example of the attenuation characteristics of a high frequency filter (schematic % formula %).
図中、■は高周波フィルタ ２は入出力整合回路、３は
出力側整合回路、４及び５は第１及び第２キヤパシタ、
６′及び７′は第１及び第２非磁気シールドチツプイン
ダクタ、１０は金属性シール］バカバー １１及び１２
は高周波フィルタの入力及び出力端子を示す。In the figure, ■ is a high frequency filter, 2 is an input/output matching circuit, 3 is an output side matching circuit, 4 and 5 are first and second capacitors,
6' and 7' are first and second non-magnetic shield chip inductors, 10 is a metal seal] Back cover 11 and 12
indicate the input and output terminals of the high frequency filter.
以上説明したように本発明は高周波フィルタ入出力整合
回路に必要なインダクタとして磁気シールドチップイン
ダクタを用いることにより、機器の小型化が計り、ると
同時に入出力整合回路間の電磁結合を抵く抑えることが
できるという効果がある。As explained above, the present invention uses a magnetically shielded chip inductor as an inductor necessary for a high-frequency filter input/output matching circuit, thereby reducing the size of the device and at the same time, resisting and suppressing electromagnetic coupling between the input and output matching circuits. It has the effect of being able to
第１図は本発明の一実施例、第２図は高周波フィルタの
減衰特性例（模式図）、第３図は高周波フィルタの出力
側整合回路を金属性シールドケースで覆った例の断面図
である。
■・・ 高周波フィルタ、２ ・入力側整合回路、３
・・・・出力側整合回路、４ ・・・・第１キヤパシ
タ、５ ・・第２キヤパンタ、６ ・・・第１磁気シー
ルドチツプインタクタ、６′・・・・・・第３非磁気シ
ールドチツプインダクタ、７・・・・第２磁気シールド
チツプイングクタ、７′・・・・・第２非磁気シールド
チツプインダクタ、１０・・金属性シールドカバー１］
・・・・高周波フィルタの入力端子、１２・・・・・高
周波フィルタの出力端子。Fig. 1 shows an example of the present invention, Fig. 2 shows an example (schematic diagram) of the attenuation characteristics of a high-frequency filter, and Fig. 3 shows a cross-sectional view of an example in which the output-side matching circuit of the high-frequency filter is covered with a metal shield case. be. ■... High frequency filter, 2 ・Input side matching circuit, 3
...Output side matching circuit, 4...First capacitor, 5...Second capacitor, 6...First magnetic shield chip intactor, 6'...Third non-magnetic shield Chip inductor, 7...Second magnetic shield chip inductor, 7'...Second non-magnetic shield chip inductor, 10...Metallic shield cover 1]
... Input terminal of high frequency filter, 12 ... Output terminal of high frequency filter.
Claims (2)
路のうち少なくとも一方に、フェライトで磁気シールド
されたチップインダクタンス素子を含むことを特徴とす
るフィルタ入出力整合回路。1. A filter input/output matching circuit characterized in that at least one of an input-side matching circuit and an output-side matching circuit of a high-frequency filter includes a chip inductance element magnetically shielded with ferrite.
プインダクタであることを特徴とする請求項１記載のフ
ィルタ入出力整合回路。2. 2. The filter input/output matching circuit according to claim 1, wherein said chip inductance element is a magnetically shielded chip inductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31667189A JPH03175808A (en) | 1989-12-05 | 1989-12-05 | Filter input/output matching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31667189A JPH03175808A (en) | 1989-12-05 | 1989-12-05 | Filter input/output matching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03175808A true JPH03175808A (en) | 1991-07-30 |
Family
ID=18079615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31667189A Pending JPH03175808A (en) | 1989-12-05 | 1989-12-05 | Filter input/output matching circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03175808A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5883553A (en) * | 1996-09-02 | 1999-03-16 | Nec Corporation | Filter unit adapted for miniaturization and for selecting a particular signal where a plurality of signals different in bandwidth coexist |
| JP2014179967A (en) * | 2013-02-15 | 2014-09-25 | Murata Mfg Co Ltd | Polar low pass filter and demultiplexer having the same |
-
1989
- 1989-12-05 JP JP31667189A patent/JPH03175808A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5883553A (en) * | 1996-09-02 | 1999-03-16 | Nec Corporation | Filter unit adapted for miniaturization and for selecting a particular signal where a plurality of signals different in bandwidth coexist |
| JP2014179967A (en) * | 2013-02-15 | 2014-09-25 | Murata Mfg Co Ltd | Polar low pass filter and demultiplexer having the same |
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