JPH1155004A - Band pass filter - Google Patents
Band pass filterInfo
- Publication number
- JPH1155004A JPH1155004A JP21034597A JP21034597A JPH1155004A JP H1155004 A JPH1155004 A JP H1155004A JP 21034597 A JP21034597 A JP 21034597A JP 21034597 A JP21034597 A JP 21034597A JP H1155004 A JPH1155004 A JP H1155004A
- Authority
- JP
- Japan
- Prior art keywords
- conductor
- conductor line
- line
- printed circuit
- lines
- 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.)
- Withdrawn
Links
Landscapes
- Parts Printed On Printed Circuit Boards (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ＵＨＦ帯で使用す
るのに好適なバンドパスフィルタ、詳しくは、複同調回
路からなるバンドパスフィルタに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bandpass filter suitable for use in the UHF band, and more particularly, to a bandpass filter including a double tuning circuit.
【０００２】[0002]
【従来の技術】ＵＨＦ帯で使用する複同調回路はインダ
クタのインダクタンスが極めて小さくなり、インダクタ
をコイルで構成しようとすると実現不可能となる。そこ
で、一般的には、インダクタとしてはいわゆる導体線路
が用いられる。2. Description of the Related Art In a double-tuned circuit used in the UHF band, the inductance of an inductor becomes extremely small. Therefore, a so-called conductor line is generally used as the inductor.
【０００３】図１は従来の複同調回路に用いられる導体
線路の取付状態の斜視図である。図１において、プリン
ト基板２１上には複同調回路を構成するコ字状の導体線
路２２、２３が対向して立設されている。導体線路２
２、２３は、例えば、導線をコ字状に折り曲げて形成し
たり、あるいは金属板をコ字状にプレスして形成され
る。そして、対向する導体線路２２、２３のそれぞれの
一端をプリント基板２１の裏面に設けた接地導体（図示
せず）に接続し、一方の導体線路２２の他端に図示しな
い前段の回路を接続し、他方の導体線路２３の他端に図
示しない後段の回路を接続するようにしている。そし
て、前段の回路から一方の導体線路２２に信号を入力
し、他方の導体線路２３に誘起した信号を後段の回路に
伝送するようにしている。FIG. 1 is a perspective view showing an attached state of a conductor line used in a conventional double tuning circuit. In FIG. 1, U-shaped conductor lines 22 and 23 constituting a double-tuned circuit are erected on a printed board 21 so as to face each other. Conductor line 2
The reference numerals 2 and 23 are formed by, for example, bending a conductive wire into a U-shape or pressing a metal plate into a U-shape. Then, one end of each of the opposing conductor lines 22 and 23 is connected to a ground conductor (not shown) provided on the back surface of the printed circuit board 21, and the preceding circuit (not shown) is connected to the other end of one conductor line 22. A second-stage circuit (not shown) is connected to the other end of the other conductor line 23. Then, a signal is input to one conductor line 22 from the preceding circuit, and a signal induced on the other conductor line 23 is transmitted to the subsequent circuit.
【０００４】ここで、導体線路２２、２３の長さは入力
される信号の周波数における１／４波長に設定されるこ
とによって導体線路２２、２３はこの周波数で共振状態
となり、導体線路２２、２３が互いに結合することによ
り図５の等価回路で示す複同調回路が構成される。Here, the length of the conductor lines 22 and 23 is set to １ ／ wavelength at the frequency of the input signal, so that the conductor lines 22 and 23 resonate at this frequency. Are combined with each other to form a double-tuned circuit shown by the equivalent circuit in FIG.
【０００５】図５において、互いに並列接続されたイン
ダクタ２２ａとコンデンサ２２ｂは図１の導体線路２２
の等価回路であり、同様に、互いに並列接続されたイン
ダクタ２３ａとコンデンサ２３ｂは図１の導体線路２３
の等価回路である。そして、インダクタ２２ａとコンデ
ンサ２２ｂ、およびインダクタ２３ａとコンデンサ２３
ｂがそれぞれ入力信号の周波数に同調している。この複
同調回路の入力側と出力側にコンデンサ２４、２５が接
続され、図示しない前段の回路からコンデンサ２４を介
して信号が入力され、コンデンサ２５を介して後段の回
路に出力される。In FIG. 5, an inductor 22a and a capacitor 22b connected in parallel to each other are connected to the conductor line 22 shown in FIG.
Similarly, an inductor 23a and a capacitor 23b connected in parallel to each other are connected to the conductor line 23 of FIG.
Is an equivalent circuit. Then, the inductor 22a and the capacitor 22b, and the inductor 23a and the capacitor 23
b are each tuned to the frequency of the input signal. Capacitors 24 and 25 are connected to the input side and the output side of the double-tuned circuit. A signal is input from a preceding circuit (not shown) via a capacitor 24 and output to a subsequent circuit via the capacitor 25.
【０００６】[0006]
【発明が解決しようとする課題】しかし、上記の従来の
複同調回路にあっては、コ字状に形成した導体線路２
２、２３をプリント基板２１に取り付けなければなら
ず、その取付作業を必要としていた。また、導体線路２
２、２３の取付に際しては、取付の高さ、取付間隔等の
バラツキによって複同調回路の伝送特性がばらついて、
そのために、取付後に導体線路２２、２３の間隔や取付
高さを変える等の後工程を必要とした。さらに、導体線
路２２、２３はコ字状をしており、プリント基板２１上
に立設した状態では空間的な領域を必要とするので小型
化が図れないという問題があった。そこで、本発明のバ
ンドパスフィルタは、小型化に適し、取付および取付後
の後調整工程を不要とするものである。However, in the above-mentioned conventional double-tuned circuit, the conductor line 2 formed in a U-shape is used.
2 and 23 had to be mounted on the printed circuit board 21, and the mounting work was required. Also, conductor line 2
When mounting 2, 23, the transmission characteristics of the double-tuned circuit vary due to variations in mounting height, mounting interval, and the like.
For this reason, a post-process such as changing the distance between the conductor lines 22 and 23 and the mounting height after the mounting is required. Furthermore, the conductor lines 22 and 23 have a U-shape and require a spatial area when erected on the printed circuit board 21, so that there is a problem that miniaturization cannot be achieved. Therefore, the bandpass filter of the present invention is suitable for miniaturization and does not require a post-adjustment step after mounting.
【０００７】[0007]
【課題を解決するための手段】上記課題を解決するた
め、本発明のバンドパスフィルタは、プリント基板の第
一の面上に互いに対向する第一の導体線路と第二の導体
線路とを設け、前記第一の導体線路の一端と前記第一の
導体線路の前記一端に対向する前記第二の導体線路の一
端とを接地し、前記第一の導体線路と前記第二の導体線
路とを電気的に結合させた。In order to solve the above-mentioned problems, a band-pass filter according to the present invention is provided with a first conductor line and a second conductor line facing each other on a first surface of a printed circuit board. Grounding one end of the first conductor line and one end of the second conductor line facing the one end of the first conductor line, and connecting the first conductor line and the second conductor line Electrically coupled.
【０００８】また、本発明のバンドパスフィルタは、前
記第一の導体線路と前記第二の線路との間に第三の導体
線路を設け、前記第三の導体線路を接地した。In the band pass filter according to the present invention, a third conductor line is provided between the first conductor line and the second line, and the third conductor line is grounded.
【０００９】また、本発明のバンドパスフィルタは、前
記第三の導体線路を、前記プリント基板の前記第一の面
上に設けた。In the band pass filter according to the present invention, the third conductor line is provided on the first surface of the printed circuit board.
【００１０】また、本発明のバンドパスフィルタは、前
記プリント基板の前記第一の面上に被着された接地導体
を形成し、前記接地導体から前記第一の導体線路と前記
第二の導体線路と前記第三の導体線路とを延在して前記
プリント基板の前記第二の面上に被着形成した。The band pass filter according to the present invention may further comprise a ground conductor formed on the first surface of the printed circuit board, and the first conductor line and the second conductor may be formed from the ground conductor. A line and the third conductor line are extended and attached on the second surface of the printed circuit board.
【００１１】また、本発明のバンドパスフィルタは、前
記プリント基板の第二の面には導体を設けないようにし
た。Further, in the bandpass filter according to the present invention, no conductor is provided on the second surface of the printed circuit board.
【００１２】また、本発明のバンドパスフィルタは、前
記プリント基板の前記第二の面に導体を設け、少なくと
も前記第一の導体線路と前記第二の導体線路とによって
囲まれる領域における前記プリント基板の第二の面に、
導体を形成しない導体削除部を設けた。[0012] The band pass filter of the present invention may further comprise a conductor provided on the second surface of the printed circuit board, wherein the printed circuit board is provided at least in a region surrounded by the first conductor line and the second conductor line. On the second side of
A conductor removal portion where no conductor is formed is provided.
【００１３】[0013]
【発明の実施の形態】本発明のバンドパスフィルタに関
わる実施の形態を図１乃至図３で説明する。先ず、図１
において、プリント基板１は図示しない金属のシ−ルド
ケ−ス内に収納され、このプリント基板１上に各種の回
路が形成されている。また、このプリント基板１の上面
（第一の面）には回路を形成するための接地導体２が印
刷等の手段によって形成され、この接地導体２はシ−ル
ドケ−スに接続されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment relating to a bandpass filter of the present invention will be described with reference to FIGS. First, FIG.
In FIG. 1, the printed circuit board 1 is accommodated in a metal shield case (not shown), and various circuits are formed on the printed circuit board 1. A ground conductor 2 for forming a circuit is formed on the upper surface (first surface) of the printed circuit board 1 by means such as printing, and the ground conductor 2 is connected to a shield case.
【００１４】そして、プリント基板１の上面には、接地
導体２から延在して第一の導体線路３と第二の導体線路
４とが互いに所定間隔で対向した状態で並設されてい
る。また、第一の導体線路３と第二の導体線路４との間
には、第三の導体線路５が接地導体２から延在して設け
られている。第一乃至第三の導体線路２、３、５は導線
をプリント基板１上に載置してもよいが、第一の導体線
路３、第二の導体線路４、第三の導体線路５を接地導体
２とともに印刷等の手段によって同時に被着形成しても
よい。第一の導体線路３と第二の導体線路４とは所定の
間隔で対向しているが、その間隔は、第一の導体線路３
に流れる電流によって第二の導体線路４に電圧が誘起す
るに充分な程度に設定されている。そして、第一の導体
線路３の他端（解放端）には接続導体６によってリ−ド
レス部品であるチップコンデンサ７が接続され、このチ
ップコンデンサ７に図示しない前段の回路が接続されて
いる。また、第二の導体線路４の他端（解放端）にも接
続導体８によってリ−ドレス部品であるチップコンデン
サ９が接続され、さらに、このチップコンデンサ９に図
示しない後段の回路が接続されている。On the upper surface of the printed circuit board 1, a first conductor line 3 and a second conductor line 4 extending from the ground conductor 2 are arranged side by side at a predetermined interval. A third conductor line 5 is provided between the first conductor line 3 and the second conductor line 4 so as to extend from the ground conductor 2. For the first to third conductor lines 2, 3, and 5, conductors may be placed on the printed circuit board 1, but the first conductor line 3, the second conductor line 4, and the third conductor line 5 It may be formed simultaneously with the ground conductor 2 by means of printing or the like. The first conductor line 3 and the second conductor line 4 face each other at a predetermined interval, and the interval is
Is set to a degree sufficient to induce a voltage in the second conductor line 4 by the current flowing through the second conductor line 4. A chip capacitor 7 as a leadless component is connected to the other end (open end) of the first conductor line 3 by a connection conductor 6, and a preceding circuit (not shown) is connected to the chip capacitor 7. A chip capacitor 9 as a leadless component is also connected to the other end (open end) of the second conductor line 4 by a connection conductor 8, and a subsequent circuit (not shown) is connected to the chip capacitor 9. I have.
【００１５】そして、図示しない前段の回路からの信号
がチップコンデンサ７を介して第一の導体線路３に入力
されてこの第一の導体線路３に電流が流れ、また、第二
の導体線路４に誘起した電圧がチップコンデンサ９を介
して図示しない後段の回路に供給される。ここで、第一
の導体線路３の長さと第二の導体線路４の長さは、図示
しない前段の回路から入力される信号の周波数（以下、
特定周波数という）の１／４波長に設定されている。こ
の結果、第一の導体線路３と第二の導体線路４とはそれ
ぞれの他端におけるインピ−ダンスが極めて高くなり、
しかも、第一の導体線路３と第二の導体線路４とは電気
的に結合（主に誘導結合）しているので、この第一の導
体線路３と第二の導体線路４とはバンドパスフィルタで
ある複同調回路を構成する。A signal from a preceding circuit (not shown) is input to the first conductor line 3 via the chip capacitor 7 so that a current flows through the first conductor line 3 and the second conductor line 4 Is supplied to a subsequent circuit (not shown) via the chip capacitor 9. Here, the length of the first conductor line 3 and the length of the second conductor line 4 are determined by the frequency of a signal input from a preceding circuit (not shown)
(Referred to as a specific frequency). As a result, the impedance at the other end of each of the first conductor line 3 and the second conductor line 4 becomes extremely high,
Moreover, since the first conductor line 3 and the second conductor line 4 are electrically coupled (mainly inductively coupled), the first conductor line 3 and the second conductor line 4 are band-passed. Construct a double-tuned circuit that is a filter.
【００１６】即ち、特定周波数においては、図２にその
等価回路を示すように、第一の導体線路３はこの特定周
波数で共振するインダクタ３ａとコンデンサ３ｂとで示
され、また、第二の導体線路４も共振するインダクタ４
ａとコンデンサ４ｂとで示される。そして、第一の導体
線路３と第二の導体線路４とによって複同調回路が形成
できるので、複同調回路を平面的に構成でき、小型化が
図れる。That is, at a specific frequency, as shown in an equivalent circuit of FIG. 2, the first conductor line 3 is represented by an inductor 3a and a capacitor 3b which resonate at this specific frequency. Inductor 4 that also resonates line 4
a and the capacitor 4b. Further, since a double-tuned circuit can be formed by the first conductor line 3 and the second conductor line 4, the double-tuned circuit can be configured in a planar manner, and downsizing can be achieved.
【００１７】なお、第三の導体線路５は第一の導体線路
３と第二の導体線路４との結合の度合いを設定するもの
であり、例えば、その長さを短くすれば第一の導体線路
３と第二の導体線路４との結合が強くなり、長くするほ
ど結合は弱くなる。そして、この第三の導体線路５は、
第一の導体線路３および第二の導体線路４と同じプリン
ト基板の上面に設けるので、第一の導体線路３と第二の
導体線路４との結合度合いを大きく変えることができ
る。従って、複同調の伝送特性（レスポンス特性）がい
わゆる臨界特性となるようにその長さを適宜に設定すれ
ばよい。なお、第三の導体線路５を設けずに、第一の導
体線路３と第二の導体線路４との間隔のみで所定の結合
度合いを得ることが可能であるが、第三の導体線路５を
設けることによって、第一の導体線路３と第二の導体線
路４との間隔をより小さくして予め結合を大きくし、第
三の導体線路によって所定の結合にできる。この結果、
複同調回路を構成する面積が小さくなって小型化が図れ
る。The third conductor line 5 is for setting the degree of coupling between the first conductor line 3 and the second conductor line 4. The coupling between the line 3 and the second conductor line 4 becomes stronger, and the longer the length, the weaker the coupling. And this third conductor line 5
Since the first conductor line 3 and the second conductor line 4 are provided on the same upper surface of the printed circuit board, the degree of coupling between the first conductor line 3 and the second conductor line 4 can be greatly changed. Therefore, the length may be appropriately set so that the transmission characteristics (response characteristics) of the double tuning become so-called critical characteristics. In addition, it is possible to obtain a predetermined coupling degree only by providing an interval between the first conductor line 3 and the second conductor line 4 without providing the third conductor line 5. Is provided, the distance between the first conductor line 3 and the second conductor line 4 can be reduced to increase the coupling in advance, and a predetermined coupling can be achieved by the third conductor line. As a result,
The area constituting the double-tuned circuit is reduced, and the size can be reduced.
【００１８】なお、図示はしないが、第一の導体線路３
および第二の導体線路４の長さを、特定周波数における
１／４波長よりも短くしてそれぞれの他端をコンデンサ
で接地すれば第一の導体線路３と第二の導体線路４とを
短縮した状態で特定周波数に共振させることができるの
で複同調回路をさらに小型化できる。Although not shown, the first conductor line 3
If the length of the second conductor line 4 is shorter than a quarter wavelength at a specific frequency and the other end is grounded by a capacitor, the first conductor line 3 and the second conductor line 4 are shortened. In this state, resonance can be performed at a specific frequency, so that the size of the double tuning circuit can be further reduced.
【００１９】また、この複同調回路に接続される前段の
回路の出力インピ−ダンスと後段の入力インピ−ダンス
とが低い場合には、図３に示すように、第一の導体線路
３の途中の位置から接続導体６によってコンデンサ７を
接続し、このコンデンサ７に図示しない前段の回路を接
続し、同様に、第二の導体線路４の途中の位置から接続
導体８によってコンデンサ９を接続し、このコンデンサ
９に図示しない後段の回路を接続することによって、複
同調回路と前段の回路とのインピ−ダンス整合および複
同調回路と後段の回路とのインピ−ダンス整合が得られ
る。When the output impedance of the preceding stage connected to the double-tuned circuit and the input impedance of the succeeding stage are low, as shown in FIG. , A capacitor 7 is connected by a connection conductor 6 by a connection conductor 6, and a circuit of a preceding stage (not shown) is connected to the capacitor 7. Similarly, a capacitor 9 is connected by a connection conductor 8 from a position in the middle of the second conductor line 4. By connecting a subsequent circuit (not shown) to the capacitor 9, impedance matching between the double-tuned circuit and the preceding circuit and impedance matching between the double-tuned circuit and the subsequent circuit can be obtained.
【００２０】さらに、プリント基板１の下面（第二の
面）には導体を設けないようにすれば第一の導体線路３
と第二の導体線路４とのＱの低下が少なくなるので、複
同調回路の伝送特性が急峻になる。また、第二の面に導
体が設けられていても、図１に示すように、第一の導体
線路３と第二の導体線路４とによって囲まれた領域１０
におけるプリント基板１の下面（第二の面）に、導体を
形成しない導体除去部１１を設けると、同様に、第一の
導体線路３と第二の導体線路４とはＱの低下が少なくな
って複同調回路のＱが向上し伝送特性が急峻になる。Furthermore, if no conductor is provided on the lower surface (second surface) of the printed circuit board 1, the first conductor line 3
Therefore, the transmission characteristic of the double-tuned circuit becomes sharp. Further, even if a conductor is provided on the second surface, as shown in FIG. 1, the region 10 surrounded by the first conductor line 3 and the second conductor line 4
When the conductor removing portion 11 in which no conductor is formed is provided on the lower surface (second surface) of the printed circuit board 1, similarly, the Q of the first conductor line 3 and the second conductor line 4 is less reduced. As a result, the Q of the double-tuned circuit is improved, and the transmission characteristics become steep.
【００２１】[0021]
【発明の効果】以上のように、本発明のバンドパスフィ
ルタは、プリント基板の第一の面上に互いに対向する第
一の導体線路と第二の導体線路とを設け、前記第一の導
体線路の一端と前記第一の導体線路の前記一端に対向す
る前記第二の導体線路の一端とを接地し、前記第一の導
体線路と前記第二の導体線路とを電気的に結合させたの
で、第一の導体線路と第二の導体線路とによってバンド
パスフィルタである複同調回路を平面的に構成でき、小
型化が図れる。As described above, the band-pass filter of the present invention is provided with the first conductor line and the second conductor line facing each other on the first surface of the printed circuit board, and One end of the line and one end of the second conductor line facing the one end of the first conductor line were grounded, and the first conductor line and the second conductor line were electrically coupled. Therefore, the double-tuned circuit, which is a bandpass filter, can be configured in a plane by the first conductor line and the second conductor line, and the size can be reduced.
【００２２】また、本発明のバンドパスフィルタは、前
記第一の導体線路と前記第二の線路との間に第三の導体
線路を設け、前記第三の導体線路を接地したので、第一
の導体線路と第二の導体線路との結合を調整でき、ま
た、第一の導体線路３と第二の導体線路４との間隔をよ
り小さくして予め結合を大きくし、第三の導体線路によ
って所定の結合にできるので、複同調回路を構成する面
積が小さくなって小型化が図れる。Also, in the band pass filter according to the present invention, a third conductor line is provided between the first conductor line and the second line, and the third conductor line is grounded. The coupling between the first conductor line 3 and the second conductor line 4 can be adjusted, and the distance between the first conductor line 3 and the second conductor line 4 can be reduced to increase the coupling in advance. As a result, the area of the double tuned circuit can be reduced and the size can be reduced.
【００２３】また、本発明のバンドパスフィルタは、前
記第三の導体線路を、前記プリント基板の前記第一の面
上に設けたので、第一の導体線路３と第二の導体線路４
との結合度合いを大きく変えることができる。In the band pass filter according to the present invention, the third conductor line is provided on the first surface of the printed circuit board, so that the first conductor line 3 and the second conductor line 4 are provided.
Can be greatly changed.
【００２４】また、本発明のバンドパスフィルタは、前
記プリント基板の前記第一の面上に接地導体を被着形成
し、前記接地導体から前記第一の導体線路と前記第二の
導体線路と前記第三の導体線路とを延在して被着形成し
たので、第一の導体線路３、第二の導体線路４、第三の
導体線路５を接地導体２とともに印刷等の手段によって
同時に形成できる。また、印刷によって形成できるの
で、それぞれの導体線路の寸法的な精度が高くなり、バ
ンドパスフィルタである複同調回路の伝送特性なバラツ
キが少なくなり調整が不要となる。Further, in the band-pass filter according to the present invention, a ground conductor is formed on the first surface of the printed circuit board, and the first conductor line and the second conductor line are separated from the ground conductor. Since the third conductor line and the third conductor line are formed so as to extend, the first conductor line 3, the second conductor line 4, and the third conductor line 5 are simultaneously formed together with the ground conductor 2 by means such as printing. it can. In addition, since the conductor lines can be formed by printing, the dimensional accuracy of each conductor line is increased, the variation in the transmission characteristics of the double-tuned circuit that is a bandpass filter is reduced, and adjustment is not required.
【００２５】また、本発明のバンドパスフィルタは、プ
リント基板の第二の面には導体を設けないようにしたの
で、第一の導体線路および第二の導体線路のＱが向上
し、急峻な伝送特性が得られる。さらに、プリント基板
の第二の面にどうたいを設けても、少なくとも前記第一
の導体線路と前記第二の導体線路とによって囲まれる領
域における前記プリント基板の第二の面に、導体を形成
しない導体削除部を設けたので、第一の導体線路および
第二の導体線路のＱが向上し、急峻な伝送特性が得られ
る。In the band-pass filter of the present invention, since no conductor is provided on the second surface of the printed circuit board, the Q of the first conductor line and the second conductor line are improved, and the steepness is improved. Transmission characteristics are obtained. Furthermore, even if the second surface of the printed circuit board is provided with a conductor, a conductor is formed on at least the second surface of the printed circuit board in a region surrounded by the first conductor line and the second conductor line. Since the conductor removing portion is provided, Q of the first conductor line and the second conductor line is improved, and a steep transmission characteristic can be obtained.
【図１】本発明のバンドパスフィルタの上面図である。FIG. 1 is a top view of a bandpass filter of the present invention.
【図２】本発明のバンドパスフィルタの等価回路図であ
る。FIG. 2 is an equivalent circuit diagram of the bandpass filter of the present invention.
【図３】本発明のバンドパスフィルタの変形例である。FIG. 3 is a modification of the bandpass filter of the present invention.
【図４】従来のバンドパスフィルタの斜視図である。FIG. 4 is a perspective view of a conventional bandpass filter.
【図５】従来のバンドパスパスフィルタの等価回路図で
ある。FIG. 5 is an equivalent circuit diagram of a conventional band-pass filter.
１ プリント基板 ２ 接地導体 ３ 第一の導体線路 ３ａ、４ａ 共振インダクタ ３ｂ、４ｂ 共振コンデンサ ４ 第二の導体線路 ５ 第三の導体線路 ６、８ 接続導体 ７、９ コンデンサ １０ 領域 １１ 導体除去部 DESCRIPTION OF SYMBOLS 1 Printed circuit board 2 Ground conductor 3 First conductor line 3a, 4a Resonance inductor 3b, 4b Resonance capacitor 4 Second conductor line 5 Third conductor line 6, 8 Connection conductor 7, 9 Capacitor 10 Area 11 Conductor removal part
Claims (6)
する第一の導体線路と第二の導体線路とを設け、前記第
一の導体線路の一端と前記第一の導体線路の前記一端に
対向する前記第二の導体線路の一端とを接地し、前記第
一の導体線路と前記第二の導体線路とを電気的に結合さ
せたことを特徴とするバンドパスフィルタ。1. A first conductor line and a second conductor line facing each other are provided on a first surface of a printed circuit board, and one end of the first conductor line and the one end of the first conductor line are provided. A second end of the second conductor line facing the first conductor line is grounded, and the first conductor line and the second conductor line are electrically coupled to each other.
の間に第三の導体線路を設け、前記第三の導体線路を接
地したことを特徴とする請求項１記載のバンドパスフィ
ルタ。2. The bandpass according to claim 1, wherein a third conductor line is provided between the first conductor line and the second line, and the third conductor line is grounded. filter.
板の前記第一の面上に設けたことを特徴とする請求項２
記載のバンドパスフィルタ。3. The printed circuit board according to claim 2, wherein the third conductor line is provided on the first surface of the printed circuit board.
The described bandpass filter.
着された接地導体を形成し、前記接地導体から前記第一
の導体線路と前記第二の導体線路と前記第三の導体線路
とを延在して前記プリント基板の前記第一の面上に被着
形成したことを特徴とする請求項４記載のバンドパスフ
ィルタ。4. A ground conductor is formed on the first surface of the printed circuit board, and the first conductor line, the second conductor line, and the third conductor line are formed from the ground conductor. 5. The band-pass filter according to claim 4, wherein said band-pass filter is extended and attached on said first surface of said printed circuit board.
設けないことを特徴とする請求項１乃至４のいずれかに
記載のバンドパスフィルタ。5. The band-pass filter according to claim 1, wherein no conductor is provided on the second surface of the printed circuit board.
を設け、少なくとも前記第一の導体線路と前記第二の導
体線路とによって囲まれる領域における前記プリント基
板の第二の面に、導体を形成しない導体削除部を設けた
ことを特徴とする請求項１乃至４のいずれかに記載のバ
ンドパスフィルタ。6. A conductor is provided on the second surface of the printed circuit board, and a conductor is provided on at least a second surface of the printed circuit board in a region surrounded by the first conductor line and the second conductor line. The band-pass filter according to any one of claims 1 to 4, further comprising a conductor removing portion that is not formed.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21034597A JPH1155004A (en) | 1997-08-05 | 1997-08-05 | Band pass filter |
| TW87211262U TW405801U (en) | 1997-08-05 | 1998-07-13 | Band pass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21034597A JPH1155004A (en) | 1997-08-05 | 1997-08-05 | Band pass filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1155004A true JPH1155004A (en) | 1999-02-26 |
Family
ID=16587876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21034597A Withdrawn JPH1155004A (en) | 1997-08-05 | 1997-08-05 | Band pass filter |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH1155004A (en) |
| TW (1) | TW405801U (en) |
-
1997
- 1997-08-05 JP JP21034597A patent/JPH1155004A/en not_active Withdrawn
-
1998
- 1998-07-13 TW TW87211262U patent/TW405801U/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| TW405801U (en) | 2000-09-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20041005 |