JPH11191702A - Laminated dielectric filter - Google Patents
Laminated dielectric filterInfo
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- JPH11191702A JPH11191702A JP35693897A JP35693897A JPH11191702A JP H11191702 A JPH11191702 A JP H11191702A JP 35693897 A JP35693897 A JP 35693897A JP 35693897 A JP35693897 A JP 35693897A JP H11191702 A JPH11191702 A JP H11191702A
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ＲＦモジュール用
回路基板等に内蔵可能で、携帯通信用電話機等の高周波
回路無線部に組み込まれるフィルタやデュプレクサ等に
利用される積層型誘電体フィルタに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated dielectric filter which can be built in a circuit board for an RF module or the like and which is used in a filter or a duplexer incorporated in a radio-frequency circuit radio section of a portable communication telephone or the like.
【０００２】[0002]
【従来技術】従来、受信通過帯域の数十ＭＨｚ近傍に減
衰を必要とする携帯電話の受信ＲＦフィルタとして用い
られてきたのは、その急峻な減衰特性から専らＳＡＷフ
ィルタで、積層型誘電体フィルタはほとんど用いられて
いない（急峻な減衰特性の必要ないコードレス電話は除
く）。また、同軸型誘電体フィルタはそのサイズが大き
いために、使用される機会が少なくなってきた。2. Description of the Related Art Conventionally, SAW filters have been mainly used as reception RF filters for portable telephones requiring attenuation in the vicinity of several tens of MHz of a reception pass band, because of their steep attenuation characteristics, and multilayer dielectric filters. Is rarely used (except for cordless phones that do not require steep attenuation characteristics). In addition, coaxial dielectric filters have been used less frequently because of their large size.
【０００３】ところで、携帯電話の小型化に伴い、電子
部品の小型化の要求は強く、電子部品のモジュール化が
進み、帯域通過フィルタ（Band Pass Filterで、以下、
ＢＰＦという）、低域通過フィルタ（Low Pass Filter
で、以下、ＬＰＦという）等のフィルタや、インピーダ
ンスマッチング用のマッチング回路などの受動回路を、
回路基板に内蔵することが要求されている。[0003] By the way, with the miniaturization of mobile phones, there is a strong demand for miniaturization of electronic components, and modularization of electronic components has progressed.
BPF), Low Pass Filter (Low Pass Filter)
In the following, a passive circuit such as a filter such as an LPF) or a matching circuit for impedance matching is used.
It is required to be built in a circuit board.
【０００４】さらに、携帯電話のデュアル化（例えば、
９００ＭＨｚ帯と１８００ＭＨｚ帯の両方を送受信可
能）に伴い、単純には受信用ＲＦフィルタが２つ、送信
用ＬＰＦが２つ必要になり、今後、トリプル化、多シス
テム化に進むにつれ、フィルタの数は増加していく。し
かしながら、携帯電話のサイズの大型化は許されず、更
なる小型化が要求されている。[0004] Furthermore, dualization of mobile phones (for example,
With the transmission and reception of both the 900 MHz band and the 1800 MHz band), two RF filters for reception and two LPFs for transmission are simply required. Increases. However, an increase in the size of a mobile phone is not allowed, and a further reduction in size is required.
【０００５】そのため、急峻な特性をもち、更に、ＬＰ
Ｆやマッチング回路等とともに内蔵できるよう、最大２
０程度までの比誘電率の回路基板に内蔵可能なフィルタ
が求められる。更に、２ｍｍ以下の低背化が要求される
電子部品で用いる回路基板に内蔵できるよう、フィルタ
の厚みは最大１．２ｍｍ程度に制限される（実装される
チップ品が最大０．７ｍｍと仮定）。[0005] Therefore, it has a steep characteristic,
Up to 2 so that it can be built in with F and matching circuit, etc.
There is a need for a filter that can be built into a circuit board having a relative dielectric constant of about 0. Furthermore, the thickness of the filter is limited to a maximum of about 1.2 mm so that it can be built into a circuit board used for an electronic component that requires a reduction in height of 2 mm or less (assuming that a mounted chip product has a maximum of 0.7 mm). .
【０００６】従来、図８の回路図を用いて急峻な減衰特
性を有する同軸型誘電体フィルタが実現されている（OK
I Technical Review 150 Vol.60 P45〜P52 ）。Conventionally, a coaxial dielectric filter having a steep attenuation characteristic has been realized using the circuit diagram of FIG.
I Technical Review 150 Vol.60 P45-P52).
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、この同
軸型誘電体フィルタではサイズが大きくなり、上記した
ような近年の小型化、低背化には対応できないという問
題があった。また、この回路図によれば、積層型誘電体
フィルタでは実現困難な大きなインダクタンスＬが必要
であった。However, this coaxial dielectric filter has a large size, and cannot cope with the recent downsizing and reduction in height as described above. Further, according to this circuit diagram, a large inductance L, which is difficult to realize with a laminated dielectric filter, is required.
【０００８】本発明は、小型化、薄型化でき、マッチン
グ回路等を内蔵した回路基板に一体的に内蔵可能で、急
峻な減衰特性をもつ積層型誘電体フィルタを提供するこ
とを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide a laminated dielectric filter having a steep attenuation characteristic, which can be reduced in size and thickness, and can be integrated into a circuit board having a matching circuit and the like.
【０００９】[0009]
【課題を解決するための手段】本発明の積層型誘電体フ
ィルタは、誘電体層を複数積層してなる積層体内に、複
数段の１／４波長ストリップライン型共振器を有する積
層型誘電体フィルタであって、前記１／４波長ストリッ
プライン型共振器を、同一平面に形成された複数の共振
電極と、両脇の共振電極の上下にそれぞれ形成され、両
脇の共振電極および該両脇の共振電極にそれぞれ隣り合
う共振電極とビアホール導体によりそれぞれ接続される
容量形成用電極とを具備して構成するとともに、前記ビ
アホール導体により接続された共振電極と容量形成用電
極との間にそれぞれ入出力電極を形成してなり、前記両
脇の共振電極と、該両脇の共振電極にそれぞれ隣り合う
共振電極とが近接し、電磁結合しているものである。こ
こで、両脇の共振電極と、該両脇の共振電極にそれぞれ
隣り合う共振電極との間隔が０．３ｍｍ以下であること
が望ましい。According to the present invention, there is provided a laminated dielectric filter comprising a plurality of dielectric layers having a plurality of quarter-wavelength stripline resonators in a laminated body. A filter comprising: a plurality of resonance electrodes formed on the same plane; and a resonance electrode on both sides formed above and below a resonance electrode on both sides. And a capacitor forming electrode connected to each of the adjacent resonant electrodes by a via-hole conductor, respectively, and are respectively provided between the resonant electrode and the capacitor-forming electrode connected by the via-hole conductor. An output electrode is formed, and the resonance electrodes on both sides and the resonance electrodes adjacent to the resonance electrodes on both sides are close to each other and are electromagnetically coupled. Here, it is desirable that the distance between the resonance electrodes on both sides and the resonance electrodes adjacent to the resonance electrodes on both sides be 0.3 mm or less.
【００１０】[0010]
【作用】本発明の積層型誘電体フィルタでは、両脇の共
振電極と、これらの共振電極にそれぞれ隣り合う共振電
極とが近接し、電磁結合しているため、相互インダクン
スが発生し、この相互インダクタンスと、入出力電極と
共振電極間で発生する複数の入出力容量、及び共振器か
ら構成される共振回路により、通過帯域高周波側近傍に
極が形成され、急峻な減衰特性が実現される。According to the laminated dielectric filter of the present invention, the resonance electrodes on both sides and the resonance electrodes adjacent to these resonance electrodes are close to each other and are electromagnetically coupled, so that mutual inductance is generated. A pole is formed near the high frequency side of the pass band by the inductance, a plurality of input / output capacitances generated between the input / output electrodes and the resonance electrode, and a resonance circuit constituted by a resonator, thereby realizing a steep attenuation characteristic.
【００１１】また、共振電極に接続された容量形成用電
極とアース電極間に発生する容量により、共振電極の長
さを短縮でき、フィルタの小型化が図られる。Further, the length of the resonance electrode can be shortened by the capacitance generated between the capacitance forming electrode connected to the resonance electrode and the ground electrode, and the size of the filter can be reduced.
【００１２】つまり、本願発明は、図８で示した従来の
回路のインダクタンスＬの代わりに、図７に示す回路の
ように共振電極間の相互インダクタンスを用いたもの
で、このような構成とすることにより、積層型誘電体フ
ィルタにおいて急峻な減衰特性を実現できるのである。That is, the present invention uses a mutual inductance between the resonance electrodes as shown in a circuit of FIG. 7 instead of the inductance L of the conventional circuit shown in FIG. As a result, steep attenuation characteristics can be realized in the laminated dielectric filter.
【００１３】また、両脇の共振電極と、これらの共振電
極にそれぞれ隣り合う共振電極との間隔を０．３ｍｍ以
下とすることにより、これらの共振電極間の磁器結合が
強固となり、相互インダクンスが大きくなり、通過帯域
高周波側近傍に極を確実に形成でき、より急峻な減衰特
性を実現できる。Further, by setting the distance between the resonance electrodes on both sides and the resonance electrodes adjacent to these resonance electrodes to be 0.3 mm or less, the magnetic coupling between these resonance electrodes is strengthened, and the mutual inductance is reduced. As a result, the pole can be reliably formed near the high frequency side of the pass band, and a steeper attenuation characteristic can be realized.
【００１４】[0014]
【発明の実施の形態】図１は本発明の積層型誘電体フィ
ルタ（以下、フィルタという）の模式的展開図、図２は
フィルタの外観を示すもので内部構成を省略した斜視
図、図３はフィルタの断面図である。FIG. 1 is a schematic development view of a laminated dielectric filter (hereinafter, referred to as a filter) of the present invention, FIG. 2 is a perspective view showing the external appearance of the filter, and the internal structure is omitted. Is a cross-sectional view of the filter.
【００１５】図１において、符号１〜９は誘電体層であ
る。符号１３Ａ〜１３Ｄは誘電体層５の一主面に形成さ
れた共振電極で、符号１１、１２はアース電極である。
符号１４Ａ、１４Ｄは誘電体層７の一主面に形成された
容量形成用電極で、それぞれ共振電極１３Ａ、１３Ｄの
上方に形成され、共振電極１３Ａ、１３Ｄとビアホール
導体３１、３４によって接続されている。同様に、符号
１４Ｂ、１４Ｃは誘電体層２の一主面に形成された容量
形成用電極で、それぞれ共振電極１３Ｂ、１３Ｃの下方
に形成され、共振電極１３Ｂ、１３Ｃとビアホール導体
３２、３３によって接続されている。In FIG. 1, reference numerals 1 to 9 are dielectric layers. Reference numerals 13A to 13D denote resonance electrodes formed on one main surface of the dielectric layer 5, and reference numerals 11 and 12 denote ground electrodes.
Reference numerals 14A and 14D denote capacitance forming electrodes formed on one main surface of the dielectric layer 7, formed above the resonance electrodes 13A and 13D, respectively, and connected to the resonance electrodes 13A and 13D by via-hole conductors 31 and 34, respectively. I have. Similarly, reference numerals 14B and 14C denote capacitance forming electrodes formed on one main surface of the dielectric layer 2, which are formed below the resonance electrodes 13B and 13C, respectively, and are formed by the resonance electrodes 13B and 13C and the via hole conductors 32 and 33. It is connected.
【００１６】これらの共振電極１３Ａ〜１３Ｄ、アース
電極１１、１２、容量形成用電極１４Ａ、１４Ｂ、１４
Ｃ、１４Ｄ、ビアホール導体３１、３２、３３、３４
で、４段の１／４波長ストリップライン型共振器を形成
している。The resonance electrodes 13A to 13D, the ground electrodes 11, 12, and the capacitance forming electrodes 14A, 14B, 14
C, 14D, via-hole conductors 31, 32, 33, 34
Thus, a four-stage quarter-wave strip line type resonator is formed.
【００１７】初段の共振器の共振電極１３Ａと隣り合う
共振電極１３Ｂは近接して配置されており、電極１３
Ａ、１３Ｂ間に相互インダクタンスが形成されている。
同様に、終段の共振器の共振電極１３Ｄと隣り合う共振
電極１３Ｃも近接して配置されており、電極１３Ｃ、１
３Ｄ間に相互インダクタンスが形成されている。つま
り、両脇の共振電極１３Ａ、１３Ｄと、これらにそれぞ
れ隣り合う共振電極１３Ｂ、１３Ｃとがそれぞれ近接し
て配置されている。The resonance electrode 13A of the first-stage resonator and the resonance electrode 13B adjacent thereto are arranged close to each other.
Mutual inductance is formed between A and 13B.
Similarly, the resonance electrode 13C adjacent to the resonance electrode 13D of the last-stage resonator is also arranged close to the electrode 13C,
Mutual inductance is formed between the 3Ds. That is, the resonance electrodes 13A and 13D on both sides and the resonance electrodes 13B and 13C adjacent to the resonance electrodes 13A and 13D are arranged close to each other.
【００１８】共振電極１３Ａ、１３Ｂと、共振電極１３
Ｃ、１３Ｄの相互インダクタンスが小さすぎると通過帯
域近傍の高周波側に極を発生させることが困難になるた
め、共振電極１３Ａと１３Ｂ、共振電極１３Ｃと１３Ｄ
間は０．３ｍｍ以下、さらにフィルタの特性を調整する
ことを考えると０．１５ｍｍ以下が望ましい。The resonance electrodes 13A and 13B and the resonance electrode 13
If the mutual inductance of C and 13D is too small, it is difficult to generate a pole on the high frequency side near the pass band, so the resonance electrodes 13A and 13B and the resonance electrodes 13C and 13D
The interval is preferably 0.3 mm or less, and more preferably 0.15 mm or less in consideration of adjusting the characteristics of the filter.
【００１９】また、ビアホール導体３１により接続され
た容量形成用電極１４Ａと共振電極１３Ａとの間には、
第１入出力電極１５Ａが形成され、ビアホール導体３２
により接続された容量形成用電極１４Ｂと共振電極１３
Ｂとの間には、第２入出力電極１６Ａが形成され、ビア
ホール導体３３により接続された容量形成用電極１４Ｃ
と共振電極１３Ｃとの間には、第２入出力電極１６Ｂが
形成され、ビアホール導体３４により接続された容量形
成用電極１４Ｄと共振電極１３Ｄとの間には、第１入出
力電極１５Ｂが形成されている。Further, between the capacitance forming electrode 14A and the resonance electrode 13A connected by the via hole conductor 31,
The first input / output electrode 15A is formed, and the via-hole conductor 32 is formed.
Forming electrode 14B and resonance electrode 13 connected by
B, a second input / output electrode 16A is formed, and a capacitance forming electrode 14C connected by a via-hole conductor 33 is formed.
The second input / output electrode 16B is formed between the first electrode and the resonance electrode 13C, and the first input / output electrode 15B is formed between the resonance electrode 13D and the capacitance forming electrode 14D connected by the via-hole conductor. Have been.
【００２０】このように、第１入出力電極１５Ａ、１５
Ｂが、容量形成用電極１４Ａ、１４Ｄと対向することで
第１入出力容量を形成している。また、第２入出力電極
１６Ａ、１６Ｂが、容量形成用電極１４Ｂ、１４Ｃと対
向することで第２入出力容量を形成している。相互イン
ダクタンス、第１入出力容量、第２入出力容量および共
振器により、減衰極発生のための共振回路が構成されて
いる。As described above, the first input / output electrodes 15A, 15A
B forms the first input / output capacitance by facing the capacitance forming electrodes 14A and 14D. The second input / output electrodes 16A and 16B are opposed to the capacitance forming electrodes 14B and 14C to form a second input / output capacitance. The mutual inductance, the first input / output capacitance, the second input / output capacitance, and the resonator form a resonance circuit for generating an attenuation pole.
【００２１】また、誘電体層３の一主面に形成された浮
遊容量電極１７は共振電極１３Ｂ、１３Ｃと対向し、そ
れらの電極間の段間容量を形成している。The floating capacitance electrode 17 formed on one main surface of the dielectric layer 3 is opposed to the resonance electrodes 13B and 13C, and forms an interstage capacitance between these electrodes.
【００２２】このフィルタは、図１に示すように、未焼
成のグリーンシート等からなる複数の誘電体層の片面に
導電性材料からなる電極を印刷法等により形成し、基本
的には各電極が誘電体層１〜９間で接触短絡しないよう
にしてこれらの誘電体層を積層し、焼結一体化すること
によって作製される。In this filter, as shown in FIG. 1, electrodes made of a conductive material are formed on one surface of a plurality of dielectric layers made of an unfired green sheet or the like by a printing method or the like. Are manufactured by stacking these dielectric layers so as not to cause a contact short circuit between the dielectric layers 1 to 9 and sintering and integrating them.
【００２３】誘電体層１〜９を構成する誘電体材料とし
ては、比誘電率が最大２０程度のもので、ａＭｇＯ・ｂ
ＣａＯ・ｃＴｉＯ2 （２５≦ａ≦３５，０．３≦ｂ≦
７，６０≦ｃ≦７０，ａ＋ｂ＋ｃ＝１００重量比）に、
ホウ素含有化合物をＢ2 Ｏ3 換算で３〜２０重量部、リ
チウム含有化合物をＬｉ2 Ｏ3 換算で１〜１０重量部添
加したものなどが良く、これにより、フィルタが内蔵さ
れる回路基坂内にＬＰＦやマッチング回路を一体的に内
蔵させることが可能となる。The dielectric material constituting the dielectric layers 1 to 9 has a relative dielectric constant of about 20 at the maximum, and aMgO.b
CaO · cTiO 2 (25 ≦ a ≦ 35, 0.3 ≦ b ≦
7,60 ≦ c ≦ 70, a + b + c = 100 weight ratio)
3-20 parts by weight of a boron-containing compound in terms of B 2 O 3, lithium-containing compound Li 2 O 3 in terms of a well and a material obtained by adding 1 to 10 parts by weight, thereby, in the circuit based on slope of the filter is incorporated The LPF and the matching circuit can be integrated.
【００２４】また、共振電極１３Ａ〜１３Ｄ、容量形成
用電極１４Ａ〜１４Ｄ，入出力電極１５Ａ、１５Ｂ、１
６Ａ、１６Ｂ等は、銅、銀、金などの低抵抗の導体を用
いて形成することが望ましい。そして、各誘電体層１〜
９は９００〜１０００℃程度の低温焼成材料を用いて回
路基板との同時焼成を行うことが好ましく、低温での同
時焼成により効率的に製造できる。The resonance electrodes 13A to 13D, the capacitance forming electrodes 14A to 14D, the input / output electrodes 15A, 15B, 1
6A, 16B and the like are desirably formed using a low-resistance conductor such as copper, silver, or gold. And each dielectric layer 1
No. 9 is preferably fired simultaneously with the circuit board using a low-temperature firing material of about 900 to 1000 ° C., and can be efficiently manufactured by simultaneous firing at a low temperature.
【００２５】本発明のフィルタは、単体では図２に示す
ような外観形状となる。入出力電極１５Ａ、１６Ａと、
１５Ｂ、１６Ｂに対応する位置に、外部入出力電極２
１、２２が形成され、残りの２側面に外部アース電極２
３、２４が形成されている。外部アース電極２３にはア
ース電極１１、１２が接続されるが、外部アース電極２
４には、更に共振電極１３Ａ〜１３Ｄの一端が接続され
る。The filter of the present invention has a single external appearance as shown in FIG. Input / output electrodes 15A, 16A,
External input / output electrodes 2 are provided at positions corresponding to 15B and 16B.
1 and 22 are formed, and the external ground electrode 2 is formed on the remaining two sides.
3 and 24 are formed. The earth electrodes 11 and 12 are connected to the external earth electrode 23,
4 is further connected to one ends of the resonance electrodes 13A to 13D.
【００２６】本発明のフィルタを回路基板に内蔵する場
合、図４に示す構成となる。この図４はフィルタを内蔵
した回路基板の断面図を示すものである。この場合、外
部アース電極２３、２４、外部入出力電極２１、２２の
代わりにビアや垂直電極等を用い、回路基板の任意の箇
所にフィルタを設置できる。また、図４に示すようにア
ース電極１１、１２は回路基板のアース電極で代用して
も良い。When the filter of the present invention is incorporated in a circuit board, the configuration is as shown in FIG. FIG. 4 is a sectional view of a circuit board having a built-in filter. In this case, a filter can be installed at an arbitrary position on the circuit board by using a via, a vertical electrode, or the like instead of the external ground electrodes 23, 24 and the external input / output electrodes 21, 22. Further, as shown in FIG. 4, the ground electrodes 11 and 12 may be replaced by ground electrodes of a circuit board.
【００２７】本発明のフィルタの等価回路を図５に示
し、これについて以下に説明する。共振電極１３Ａ〜１
３Ｄ及びビアホール導体３１〜３４により共振インダク
タ４１〜４４が構成され、容量形成用電極１４Ａ〜１４
Ｄとアース電極１１、１２の間で、共振コンデンサ４５
〜４８が構成される。第１入出力電極１５Ａと容量形成
用電極１４Ａとの間で第１入出力コンデンサ５１、第２
入出力電極１６Ａと容量形成用電極１４Ｂとの間で第２
入出力コンデンサ５３が構成される。同様に、第１入出
力電極１５Ｂと容量形成用電極１４Ｄとの間で第１入出
力コンデンサ５２、第２入出力電極１６Ｂと容量形成用
電極１４Ｃとの間で第２入出力コンデンサ５４が構成さ
れる。浮遊容量電極１７により、段間コンデンサ５５が
構成される。FIG. 5 shows an equivalent circuit of the filter of the present invention, which will be described below. Resonant electrodes 13A-1
The resonance inductors 41 to 44 are constituted by the 3D and via-hole conductors 31 to 34, and the capacitance forming electrodes 14A to 14
D and the grounding electrodes 11 and 12, a resonance capacitor 45
To 48 are configured. A first input / output capacitor 51 and a second input / output capacitor 51 are provided between the first input / output electrode 15A and the capacitance forming electrode 14A.
Between the input / output electrode 16A and the capacitance forming electrode 14B, the second
An input / output capacitor 53 is configured. Similarly, a first input / output capacitor 52 is formed between the first input / output electrode 15B and the capacitance forming electrode 14D, and a second input / output capacitor 54 is formed between the second input / output electrode 16B and the capacitance forming electrode 14C. Is done. The inter-stage capacitor 55 is constituted by the floating capacitance electrode 17.
【００２８】共振電極１３Ａ〜１３Ｄはそれぞれ隣同士
の線路間で磁気結合しており、それは等価回路において
相互インダクタンスＭにより表される。特に、本発明の
フィルタでは初段の共振電極１３Ａとその隣の共振電極
１３Ｂ間の相互インダクタンスＭ1 と終段の共振電極１
３Ｄとその隣の共振電極１３Ｃ間の相互インダクタンス
Ｍ3 が急峻な減衰特性を得るために不可欠である。Each of the resonance electrodes 13A to 13D is magnetically coupled between adjacent lines, and is represented by a mutual inductance M in an equivalent circuit. In particular, the resonance electrode of the mutual inductance M 1 and final stage between the filter of the present invention the first stage resonance electrodes 13A resonance electrode 13B of the adjacent 1
Mutual inductance M 3 between the 3D and the resonance electrode 13C of the adjacent is essential to obtain a steep attenuation characteristic.
【００２９】この等価回路において、通過周波数及び通
過帯域における整合は、主に共振インダクタ４１〜４４
と共振コンデンサ４５〜４８により調整し、相互インダ
クタンスＭ1 と第１入出力容量５１及び第２入出力容量
５３、同じく相互インダクタンスＭ3 と第１入出力容量
５２及び第２入出力容量５４の比率により通過帯域近傍
の減衰極位置を調整する。In this equivalent circuit, matching in the pass frequency and pass band is mainly performed by the resonance inductors 41 to 44.
And the resonance capacitors 45 to 48 to adjust the mutual inductance M 1 and the first input / output capacitance 51 and the second input / output capacitance 53, and similarly, the ratio of the mutual inductance M 3 to the first input / output capacitance 52 and the second input / output capacitance 54. Adjusts the position of the attenuation pole near the pass band.
【００３０】通過帯域近傍以外の特性については、入出
力コンデンサ、段間コンデンサ等を用いて調整する。例
えば、通過帯域の高周波側では、第２入出力コンデンサ
５３、５４と共振電極１３Ａ〜１３Ｄにより１／２波長
型共振回路が構成され、減衰極を形成することが可能で
ある。The characteristics other than those near the pass band are adjusted by using an input / output capacitor, an interstage capacitor and the like. For example, on the high-frequency side of the pass band, the second input / output capacitors 53 and 54 and the resonance electrodes 13A to 13D form a half-wavelength resonance circuit, and an attenuation pole can be formed.
【００３１】[0031]
【実施例】図１に示す積層型誘電体フィルタについてシ
ミュレーションにより減衰量および極の発生を求めた。
フィルタのサイズは３．５×３．５×１．２ｍｍとし、
共振電極１３Ａ〜１３Ｄのサイズを０．５ｍｍ×３ｍｍ
とし、共振電極１３Ａと共振電極１３Ｂとの間隔ｄ、お
よび共振電極１３Ｃと共振電極１３Ｄとの間隔ｄを、表
１に記載するように変化させた場合の＋４０ＭＨｚにお
ける減衰量および極の発生を求めた。DESCRIPTION OF THE PREFERRED EMBODIMENTS The attenuation and the generation of poles were obtained by simulation for the laminated dielectric filter shown in FIG.
The size of the filter is 3.5 × 3.5 × 1.2mm,
The size of the resonance electrodes 13A to 13D is 0.5 mm × 3 mm
When the distance d between the resonance electrode 13A and the resonance electrode 13B and the distance d between the resonance electrode 13C and the resonance electrode 13D are changed as shown in Table 1, the attenuation and the generation of the pole at +40 MHz are obtained. Was.
【００３２】尚、＋４０ＭＨｚにおける減衰量は、通過
帯域でのマッチングをとり、入出力容量で極位置を調整
し、挿入損失３ｄＢのときの高周波側の周波数を基準
に、高周波側に＋４０ＭＨｚずれた時の減衰量を求め、
減衰特性の急峻性を評価した。減衰量が大きいものほど
急峻な減衰特性を有するものである。The amount of attenuation at +40 MHz is obtained by matching in the pass band, adjusting the pole position with the input / output capacitance, and deviating +40 MHz to the high frequency side with reference to the high frequency side when the insertion loss is 3 dB. Of attenuation of
The steepness of the attenuation characteristics was evaluated. The larger the amount of attenuation, the steeper the attenuation characteristics.
【００３３】[0033]
【表１】 [Table 1]
【００３４】この表から、間隔ｄが０．３ｍｍ以下であ
る場合、特に０．１５ｍｍ以下である場合には、共振電
極間に発生する相互インダクタンスが大きくなた、極が
発生し、急峻な減衰特性を有することが判る。From this table, it is found that when the distance d is 0.3 mm or less, particularly when the distance d is 0.15 mm or less, the mutual inductance generated between the resonance electrodes becomes large, poles are generated, and steep attenuation occurs. It can be seen that it has characteristics.
【００３５】間隔ｄが０．１ｍｍの場合の電磁場シミュ
レーションによる伝送特性を図６に示す。この図６よ
り、通過周波数帯域１８０５〜１８８０ＭＨｚにおい
て、挿入損失３ｄＢ以下、−４０ＭＨｚにおける減衰量
９ｄＢ、＋４０ＭＨｚにおける減衰量１４ｄＢであっ
た。FIG. 6 shows transmission characteristics obtained by electromagnetic field simulation when the distance d is 0.1 mm. From FIG. 6, in the pass frequency band 1805 to 1880 MHz, the insertion loss was 3 dB or less, the attenuation at -40 MHz was 9 dB, and the attenuation at +40 MHz was 14 dB.
【００３６】[0036]
【発明の効果】本発明の積層型誘電体フィルタは、共振
電極に接続された容量形成用電極とアース電極間の容量
により、共振電極長の短縮を図ることができ、小型化を
達成できる。また、共振電極間を近接することで発生す
る相互インダクタンスと入出力容量及び共振器から共振
回路が構成され、通過帯域近傍の高周波側に極が発生す
る。それにより、フィルタの急峻な減衰特性が実現され
る。さらに、本発明のフィルタは１．２ｍｍ以下で、Ｒ
Ｆモジュール用回路基板に一体的に製造可能である。According to the laminated dielectric filter of the present invention, the length of the resonance electrode can be shortened by the capacitance between the capacitance forming electrode connected to the resonance electrode and the ground electrode, and the size can be reduced. In addition, a resonance circuit is formed by a mutual inductance, an input / output capacitance, and a resonator generated when the resonance electrodes are close to each other, and a pole is generated on a high frequency side near a pass band. Thereby, a steep attenuation characteristic of the filter is realized. Further, the filter of the present invention has an R
It can be manufactured integrally with the circuit board for F module.
【図１】本発明の積層型誘電体フィルタの模式的展開斜
視図である。FIG. 1 is a schematic developed perspective view of a laminated dielectric filter of the present invention.
【図２】本発明の積層型誘電体フィルタの外観を示す斜
視図である。FIG. 2 is a perspective view showing the appearance of the multilayer dielectric filter of the present invention.
【図３】本発明の積層型誘電体フィルタの断面図であ
る。FIG. 3 is a cross-sectional view of the laminated dielectric filter of the present invention.
【図４】本発明の積層型誘電体フィルタを回路基板に内
蔵した場合の断面図である。FIG. 4 is a cross-sectional view when the multilayer dielectric filter of the present invention is built in a circuit board.
【図５】本発明の積層型誘電体フィルタの等価回路図で
ある。FIG. 5 is an equivalent circuit diagram of the laminated dielectric filter of the present invention.
【図６】本発明の積層型誘電体フィルタの電磁場シミュ
レーションによる伝送特性図である。FIG. 6 is a transmission characteristic diagram of the laminated dielectric filter of the present invention by electromagnetic field simulation.
【図７】本発明の共振回路図である。FIG. 7 is a resonance circuit diagram of the present invention.
【図８】従来の同軸型誘電体フィルタの回路図である。FIG. 8 is a circuit diagram of a conventional coaxial dielectric filter.
１〜９・・・誘電体層 １１、１２・・・アース電極 １３Ａ〜１３Ｄ・・・共振電極 １４Ａ〜１４Ｄ・・・容量形成用電極 １５Ａ、１５Ｂ・・・第１入出力電極 １６Ａ、１６Ｂ・・・第２入出力電極 １７・・・浮遊容量電極 ２１、２２・・・外部入出力電極 ２３、２４・・・外部アース電極 ３１〜３４・・・ビアホール導体 ４１〜４４・・・共振インダクタ ４５〜４８・・・共振コンデンサ ５１、５２・・・第１入出力コンデンサ ５３、５４・・・第２入出力コンデンサ ５５・・・段間コンデンサ 1 to 9: Dielectric layers 11, 12: Earth electrodes 13A to 13D: Resonant electrodes 14A to 14D: Capacitor forming electrodes 15A, 15B: First input / output electrodes 16A, 16B ··· Second input / output electrode 17 ··· Stray capacitance electrode 21 and 22 ··· External input / output electrode 23 and 24 ··· External ground electrode 31 to 34 ··· Via hole conductor 41 to 44 ··· Resonant inductor 45 ... 48 Resonant capacitors 51 and 52 First input / output capacitors 53 and 54 Second input / output capacitors 55 Interstage capacitors
Claims (2)
複数段の１／４波長ストリップライン型共振器を有する
積層型誘電体フィルタであって、前記１／４波長ストリ
ップライン型共振器を、同一平面に形成された複数の共
振電極と、両脇の共振電極の上下にそれぞれ形成され、
両脇の共振電極および該両脇の共振電極にそれぞれ隣り
合う共振電極とビアホール導体によりそれぞれ接続され
る容量形成用電極とを具備して構成するとともに、前記
ビアホール導体により接続された共振電極と容量形成用
電極との間にそれぞれ入出力電極を形成してなり、前記
両脇の共振電極と、該両脇の共振電極にそれぞれ隣り合
う共振電極とが近接し、電磁結合していることを特徴と
する積層型誘電体フィルタ。1. A laminated body formed by laminating a plurality of dielectric layers,
A laminated dielectric filter having a plurality of quarter-wavelength stripline-type resonators, wherein the quarter-wavelength stripline-type resonator includes a plurality of resonance electrodes formed on the same plane, Formed above and below the resonance electrode, respectively.
A resonance electrode on both sides, a resonance electrode adjacent to the resonance electrodes on both sides, and a capacitance forming electrode connected by a via-hole conductor, respectively, and a resonance electrode connected to the via-hole conductor and a capacitance. An input / output electrode is formed between the electrode and the forming electrode, and the resonance electrodes on both sides and the resonance electrodes adjacent to the resonance electrodes on both sides are close to each other and are electromagnetically coupled. And a laminated dielectric filter.
れぞれ隣り合う共振電極との間隔が０．３ｍｍ以下であ
ることを特徴とする請求項１記載の積層型誘電体フィル
タ。2. The laminated dielectric filter according to claim 1, wherein the distance between the resonance electrodes on both sides and the resonance electrodes adjacent to the resonance electrodes on both sides is 0.3 mm or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35693897A JP3522098B2 (en) | 1997-12-25 | 1997-12-25 | Multilayer dielectric filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35693897A JP3522098B2 (en) | 1997-12-25 | 1997-12-25 | Multilayer dielectric filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11191702A true JPH11191702A (en) | 1999-07-13 |
| JP3522098B2 JP3522098B2 (en) | 2004-04-26 |
Family
ID=18451536
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35693897A Expired - Fee Related JP3522098B2 (en) | 1997-12-25 | 1997-12-25 | Multilayer dielectric filter |
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| Country | Link |
|---|---|
| JP (1) | JP3522098B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000076755A (en) * | 1999-03-03 | 2000-12-26 | 이데이 노부유끼 | Distributed constant filter, method of manufacturing the same and distributed constant filter circuit board |
| WO2003056654A1 (en) * | 2001-12-27 | 2003-07-10 | Sony Corporation | Filter circuit apparatus and manufacturing method thereof |
| KR20030073586A (en) * | 2002-03-12 | 2003-09-19 | 삼성전기주식회사 | Rf filter circuit and laminated ceramic filter |
| JP2006311306A (en) * | 2005-04-28 | 2006-11-09 | Kyocera Corp | Band pass filter, high frequency module and radio communication equipment using the same |
| JP2008288661A (en) * | 2007-05-15 | 2008-11-27 | Panasonic Corp | Multilayer filter |
| JP2019506778A (en) * | 2015-12-16 | 2019-03-07 | クム ネットワークス, インコーポレイテッドKumu Networks, Inc. | Time delay filter |
-
1997
- 1997-12-25 JP JP35693897A patent/JP3522098B2/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000076755A (en) * | 1999-03-03 | 2000-12-26 | 이데이 노부유끼 | Distributed constant filter, method of manufacturing the same and distributed constant filter circuit board |
| WO2003056654A1 (en) * | 2001-12-27 | 2003-07-10 | Sony Corporation | Filter circuit apparatus and manufacturing method thereof |
| US6914500B2 (en) | 2001-12-27 | 2005-07-05 | Sony Corporation | Filter circuit device and method of manufacturing the same |
| US6972646B2 (en) | 2001-12-27 | 2005-12-06 | Sony Corporation | Filter circuit device and method of manufacturing the same |
| KR100949224B1 (en) * | 2001-12-27 | 2010-03-24 | 소니 주식회사 | Filter circuit apparatus and manufacturing method thereof |
| KR20030073586A (en) * | 2002-03-12 | 2003-09-19 | 삼성전기주식회사 | Rf filter circuit and laminated ceramic filter |
| JP2006311306A (en) * | 2005-04-28 | 2006-11-09 | Kyocera Corp | Band pass filter, high frequency module and radio communication equipment using the same |
| JP4523478B2 (en) * | 2005-04-28 | 2010-08-11 | 京セラ株式会社 | Band-pass filter, high-frequency module, and wireless communication device using the same |
| JP2008288661A (en) * | 2007-05-15 | 2008-11-27 | Panasonic Corp | Multilayer filter |
| JP2019506778A (en) * | 2015-12-16 | 2019-03-07 | クム ネットワークス, インコーポレイテッドKumu Networks, Inc. | Time delay filter |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3522098B2 (en) | 2004-04-26 |
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