JPH11225004A - Frequency adjusting method of dielectric filter - Google Patents

Frequency adjusting method of dielectric filter

Info

Publication number
JPH11225004A
JPH11225004A JP4130798A JP4130798A JPH11225004A JP H11225004 A JPH11225004 A JP H11225004A JP 4130798 A JP4130798 A JP 4130798A JP 4130798 A JP4130798 A JP 4130798A JP H11225004 A JPH11225004 A JP H11225004A
Authority
JP
Japan
Prior art keywords
dielectric
dielectric filter
input
electrode
conductor film
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
Application number
JP4130798A
Other languages
Japanese (ja)
Inventor
Kazuhisa Sano
和久 佐野
Akiji Miyashita
明司 宮下
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toko Inc
Original Assignee
Toko Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toko Inc filed Critical Toko Inc
Priority to JP4130798A priority Critical patent/JPH11225004A/en
Publication of JPH11225004A publication Critical patent/JPH11225004A/en
Pending legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To obtain a dielectric filter with high Q, a small size and a small thickness capable of obtaining sufficient filter characteristic in a high frequency band by providing an input/output electrode formed by a conductor film like an island on one-surface of a dielectric so as to remove a part of the conductor film of a ground electrode on a surface opposed to a surface forming the input/ output electrode. SOLUTION: Electrodes 73 and 74 are formed in the center parts of the surfaces of rectangular-parallelopiped dielectrics 71 and 72 and the electrodes 75 and 76 of conductor films surrounding these are formed. Conductor films are formed on the other surfaces except a joining surface and the conductor films of them are made the same potential (ground potential) as the electrodes 75 and 76. On the joining surface, the dielectrics are exposed and an electrode 78 for adjusting combination is formed at a portion of this joining surface. A portion of the conductor film of the ground electrode at a position opposed to the input/output electrode on a surface opposed to the formed surfaces of the electrodes 73 and 74 of the dielectric filter is removed. Along with increasing the removing area of the conductor film of the ground electrode, a center frequency can be shifted to the side of a high frequency.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、5GHz以上の高
周波帯域での利用に適した小型の誘電体フィルタの周波
数調整方法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adjusting the frequency of a small dielectric filter suitable for use in a high frequency band of 5 GHz or more.

【0002】[0002]

【従来の技術】移動体通信機器の普及にともなって、現
在使用されている周波数帯域よりも高い周波数の利用が
検討されている。これまでの移動体通信では2GHz帯
程度までの周波数が利用されており、移動局に用いられ
るフィルタとしては誘電体同軸共振器を組み合わせたも
のが主に用いられてきた。
2. Description of the Related Art With the spread of mobile communication equipment, utilization of a frequency higher than a frequency band currently used is being studied. In the conventional mobile communication, a frequency up to about 2 GHz band is used, and as a filter used in a mobile station, a combination of a dielectric coaxial resonator and a filter has been mainly used.

【0003】しかし、この誘電体同軸共振器を5GHz
以上の周波数で用いる場合には、周波数に規定される寸
法が薄くなって入出力結合を得ることが難しくなり、ま
た高いQを確保するためには外径を大きくする必要があ
る。例えば、5GHzの周波数で要求されるQを確保す
るためには10数ミリの外径が必要となる。これは、電子
部品の小型の要求に逆行するもので、実用的ではない。
あるいはTEモード共振器を用いるが、構造面で大型化
してしまうとともに、入出力結合構造も複雑となってし
まう。
However, this dielectric coaxial resonator has a frequency of 5 GHz.
When used at the above frequencies, the dimensions defined by the frequency become thin, making it difficult to obtain input / output coupling, and it is necessary to increase the outer diameter to ensure a high Q. For example, in order to secure the required Q at a frequency of 5 GHz, an outer diameter of more than 10 mm is required. This goes against the demand for smaller electronic components and is not practical.
Alternatively, a TE mode resonator is used, but the structure is increased in size and the input / output coupling structure is complicated.

【0004】[0004]

【発明が解決しようとする課題】本発明は、5GHzか
ら30GHzといった高周波帯域で十分なフィルタ特性が
得られ、Qが高くかつ小型化、薄型化の要求に合った誘
電体フィルタを提供するものである。そして、周波数調
整が可能な誘電体フィルタを提供するものである。
SUMMARY OF THE INVENTION The present invention provides a dielectric filter which has sufficient filter characteristics in a high frequency band of 5 GHz to 30 GHz, has a high Q, and meets the requirements of miniaturization and thinning. is there. It is another object of the present invention to provide a dielectric filter capable of adjusting the frequency.

【0005】[0005]

【課題を解決するための手段】本発明は、これまでの構
造とは全く異なる構造を採用するとともに、表面の導体
幕の一部を除去することによって、上記の課題を解決す
るものである。
SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems by employing a structure completely different from the conventional structure and removing a part of the conductor curtain on the surface.

【0006】すなわち、二つの直方体の誘電体が接合さ
れて成る誘電体フィルタの周波数調整方法において、そ
れぞれの誘電体の一表面に島状の導体膜による入出力電
極を具え、その入出力電極と分離絶縁されてその表面の
残りのほぼ全面と接合面を除く他の表面の全面に形成さ
れた導体膜によるアース電極を具え、接合面において誘
電体が接合されて誘電体フィルタが構成され、入出力電
極が形成された表面に対向する表面のアース電極の導体
膜の一部を除去することに特徴を有するものである。
That is, in a method of adjusting the frequency of a dielectric filter in which two rectangular parallelepiped dielectrics are joined, an input / output electrode formed of an island-shaped conductive film is provided on one surface of each dielectric, and the input / output electrodes are connected to each other. It is provided with a ground electrode made of a conductive film which is separated and insulated and is formed on substantially the entire remaining surface of the surface and the entire surface except the bonding surface, and a dielectric is bonded on the bonding surface to form a dielectric filter. It is characterized in that a part of the conductor film of the ground electrode on the surface opposite to the surface on which the output electrode is formed is removed.

【0007】[0007]

【発明の実施の形態】本発明による誘電体フィルタの共
振モードの解析はまだ完全には行われてはいないが、導
波管に近い作用を果たしているものと考えられる。その
入出力構造として誘電体の一表面の島状の電極を利用
し、誘電体が露出した接合面で共振器を結合させてフィ
ルタ特性が得られるものと考えられる。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Although the analysis of the resonance mode of the dielectric filter according to the present invention has not been completely performed, it is considered that the dielectric filter has a function close to that of a waveguide. It is considered that an island-shaped electrode on one surface of the dielectric is used as the input / output structure, and a resonator is coupled at the joint surface where the dielectric is exposed, thereby obtaining filter characteristics.

【0008】本発明においては、入出力電極が形成され
た面に対向する表面のアース電極の導体膜を除去するこ
とによって、導体膜を除去する部分から漏れる電界、磁
界を変化させて周波数を調整するものである。
In the present invention, the frequency is adjusted by changing the electric and magnetic fields leaking from the portion where the conductor film is removed by removing the conductor film of the ground electrode on the surface opposite to the surface on which the input / output electrodes are formed. Is what you do.

【0009】[0009]

【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.

【0010】本発明の前提となる誘電体を接合したタイ
プの誘電体フィルタについて説明する。図7はその誘電
体フィルタの斜視図を示す。6.0 ×6.0 ×2.5mm の直方
体の誘電体 (誘電率37) 71、72の6.0 ×6.0mm の表面の
中央部に1.4 ×1.4 mmの電極73、74を形成し、これを取
り囲む導体膜の電極75、76を形成したものである。
A description will now be given of a dielectric filter of the type in which a dielectric material is bonded as a premise of the present invention. FIG. 7 shows a perspective view of the dielectric filter. 6.0 × 6.0 × 2.5 mm rectangular parallelepiped dielectric (dielectric constant: 37) 75 and 76 are formed.

【0011】接合面を除き他の表面にも導体膜が形成さ
れ、それらの導体膜は電極75、76と同電位(アース電
位)とされる。接合面では誘電体が露出されており、こ
の接合面に結合を調整する電極78がその一部に形成され
る。この例では、電極78は幅2.0mm としてあり、入出力
電極側のアース電極と対向する表面のアース電極とを接
続している。図8は接合した状態の平面図で、入出力電
極が形成された表面に対向する表面のアース電極は全面
に導体膜が形成されている。
Conductive films are formed on the other surfaces except for the joint surfaces, and these conductive films are set to the same potential (earth potential) as the electrodes 75 and 76. The dielectric is exposed at the joint surface, and an electrode 78 for adjusting the coupling is formed on a part of the joint surface. In this example, the electrode 78 has a width of 2.0 mm and connects the ground electrode on the input / output electrode side to the ground electrode on the surface facing the input / output electrode. FIG. 8 is a plan view of the bonded state, in which a conductor film is formed on the entire surface of the ground electrode on the surface facing the surface on which the input / output electrodes are formed.

【0012】図9は、この誘電体フィルタの特性の説明
図である。上記の構成を採ったとき、中心周波数が5.98
2GHz、3dB帯域幅が181MHz、ピーク点での挿入損失が0.
92dBの特性を示していた。
FIG. 9 is an explanatory diagram of characteristics of the dielectric filter. With the above configuration, the center frequency is 5.98
2 GHz, 3 dB bandwidth 181 MHz, insertion loss at peak point is 0.
It showed a characteristic of 92 dB.

【0013】図1は、図7・図8の誘電体フィルタの入
出力電極の形成された表面に対向する表面の入出力電極
に対向する位置のアース電極の導体膜の一部を除去した
ものである。
FIG. 1 shows the dielectric filter of FIGS. 7 and 8 in which a part of the conductor film of an earth electrode at a position facing the input / output electrode on the surface opposite to the surface on which the input / output electrode is formed is removed. It is.

【0014】図1は直径1.0mm の円形に導体膜を除去し
てその部分の誘電体を露出させたものであり、このとき
の特性は図2に示したように、中心周波数が5.999GHz、
3dB帯域幅が175MHz、ピーク点での挿入損失が0.94dBと
なっており、導体膜を除去しない場合に比べて周波数帯
が高域側に変化している。
FIG. 1 is a diagram in which the conductor film is removed in a circular shape having a diameter of 1.0 mm to expose the dielectric at that portion. As shown in FIG.
The 3 dB bandwidth is 175 MHz, the insertion loss at the peak point is 0.94 dB, and the frequency band is shifted to the higher frequency side as compared with the case where the conductor film is not removed.

【0015】図3は直径1.5mm の円形に導体膜を除去し
てその部分の誘電体を露出させたものであり、このとき
の特性は図4に示したように、中心周波数が6.041GHz、
3dB帯域幅が195MHz、ピーク点での挿入損失が0.92dBと
なっており、図1と図2に示した場合に比べても周波数
帯が高域側に変化している。
FIG. 3 is a diagram in which the conductor film is removed in a circular shape having a diameter of 1.5 mm to expose the dielectric at that portion. As shown in FIG. 4, the characteristics are as shown in FIG.
The 3 dB bandwidth is 195 MHz, the insertion loss at the peak point is 0.92 dB, and the frequency band is shifted to the higher frequency side as compared with the cases shown in FIGS.

【0016】図5は直径2.5mm の円形に導体膜を除去し
てその部分の誘電体を露出させたものであり、このとき
の特性は図6に示したように、中心周波数が6.216GHz、
3dB帯域幅が214MHz、ピーク点での挿入損失が0.94dBと
なっており、上記の例に比べて更に周波数帯が高域側に
変化している。
FIG. 5 is a diagram in which the conductor film is removed in a circular shape having a diameter of 2.5 mm to expose the dielectric at that portion. As shown in FIG.
The 3 dB bandwidth is 214 MHz, the insertion loss at the peak point is 0.94 dB, and the frequency band is further shifted to the higher frequency side as compared with the above example.

【0017】上記の例からも、入出力電極に対向する表
面のアース電極の導体膜を除去する面積を大きくするに
したがって中心周波数を高域側にシフトさせることがで
きる。導体膜を削りながら特性の変化を測定し、所定の
周波数特性が得られた点で作業を終了させて周波数調整
を行うことができる。
Also from the above example, the center frequency can be shifted to a higher frequency side as the area of the surface of the ground electrode opposite to the input / output electrode from which the conductor film is removed is increased. Changes in the characteristics are measured while shaving the conductive film, and the frequency can be adjusted by terminating the work when a predetermined frequency characteristic is obtained.

【0018】[0018]

【発明の効果】本発明によれば、5GHz以上の周波数
帯域で利用可能で、かつ特性も良好な誘電体フィルタが
得られる。導体膜の除去によって共振周波数の調整、微
調整を行うことが可能となる。
According to the present invention, a dielectric filter which can be used in a frequency band of 5 GHz or more and has good characteristics can be obtained. By removing the conductive film, the resonance frequency can be adjusted and finely adjusted.

【0019】また、小型化、薄型化が可能であるだけで
なく、直方体の誘電体の表面に導体膜を形成するのみで
得られるので、製造が容易で安価な誘電体フィルタが得
られる。
Further, not only the size and thickness can be reduced, but also the dielectric filter can be obtained only by forming a conductive film on the surface of a rectangular parallelepiped dielectric, so that a dielectric filter which is easy to manufacture and inexpensive can be obtained.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の実施例の平面図FIG. 1 is a plan view of an embodiment of the present invention.

【図2】図1の誘電体フィルタの特性の説明図FIG. 2 is an explanatory diagram of characteristics of the dielectric filter of FIG.

【図3】本発明の他の実施例の平面図FIG. 3 is a plan view of another embodiment of the present invention.

【図4】図3の誘電体フィルタの特性の説明図FIG. 4 is an explanatory diagram of characteristics of the dielectric filter of FIG.

【図5】本発明の他の実施例の平面図FIG. 5 is a plan view of another embodiment of the present invention.

【図6】図5の誘電体フィルタの特性の説明図FIG. 6 is an explanatory diagram of characteristics of the dielectric filter of FIG.

【図7】本発明を適用する誘電体フィルタの組立前の斜
視図
FIG. 7 is a perspective view before assembling a dielectric filter to which the present invention is applied.

【図8】本発明を適用する誘電体フィルタの組立後の平
面図
FIG. 8 is a plan view after assembling a dielectric filter to which the present invention is applied.

【図9】図7、図8の誘電体フィルタの特性の説明図FIG. 9 is an explanatory diagram of characteristics of the dielectric filter of FIGS. 7 and 8;

【符号の説明】[Explanation of symbols]

71、72:誘電体 73、74:入出力電極 75、76:アース電極 78:導体膜 71, 72: Dielectric 73, 74: I / O electrode 75, 76: Earth electrode 78: Conductive film

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 二つの直方体の誘電体が接合されて成る
誘電体フィルタの周波数調整方法において、それぞれの
誘電体の一表面に島状の導体膜による入出力電極を具
え、その入出力電極と分離絶縁されてその表面の残りの
ほぼ全面と接合面を除く他の表面の全面に形成された導
体膜によるアース電極を具え、接合面において誘電体が
接合されて誘電体フィルタが構成され、入出力電極が形
成された表面に対向する表面のアース電極の導体膜の一
部を除去することを特徴とする誘電体フィルタの周波数
調整方法。
1. A method of adjusting the frequency of a dielectric filter in which two rectangular parallelepiped dielectrics are joined, comprising: an input / output electrode formed of an island-shaped conductive film on one surface of each dielectric; It is provided with a ground electrode made of a conductive film which is separated and insulated and is formed on substantially the entire remaining surface of the surface and the entire surface except the bonding surface, and a dielectric is bonded on the bonding surface to form a dielectric filter. A method of adjusting the frequency of a dielectric filter, comprising removing a part of a conductor film of a ground electrode on a surface facing a surface on which an output electrode is formed.
【請求項2】 二つの直方体の誘電体が接合されて成る
誘電体フィルタの周波数調整方法において、それぞれの
誘電体の一表面に島状の導体膜による入出力電極を具
え、その入出力電極と分離絶縁されてその表面の残りの
ほぼ全面と接合面を除く他の表面の全面に形成された導
体膜によるアース電極を具え、接合面の少なくとも一方
の一部にアース電極に接続された導体膜を具え、接合面
において誘電体が接合されて誘電体フィルタが構成さ
れ、入出力電極が形成された表面に対向する表面のアー
ス電極の導体膜の一部を除去することを特徴とする誘電
体フィルタの周波数調整方法。
2. A method for adjusting the frequency of a dielectric filter in which two rectangular parallelepiped dielectrics are joined, comprising: an input / output electrode formed of an island-shaped conductive film on one surface of each dielectric; A conductor film connected to the ground electrode on at least one part of the joint surface, comprising a ground electrode formed of a conductive film which is separated and insulated and is formed on substantially the entire remaining surface except for the joint surface and the entire surface except the joint surface. A dielectric filter is formed by joining a dielectric at the joining surface, and a part of the conductor film of the ground electrode on the surface facing the surface on which the input / output electrodes are formed is removed. How to adjust the frequency of the filter.
【請求項3】 入出力電極に対向する位置の導体膜を除
去する請求項1または請求項2記載の誘電体フィルタの
周波数調整方法。
3. The method for adjusting the frequency of a dielectric filter according to claim 1, wherein the conductor film at a position facing the input / output electrode is removed.
JP4130798A 1998-02-06 1998-02-06 Frequency adjusting method of dielectric filter Pending JPH11225004A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4130798A JPH11225004A (en) 1998-02-06 1998-02-06 Frequency adjusting method of dielectric filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4130798A JPH11225004A (en) 1998-02-06 1998-02-06 Frequency adjusting method of dielectric filter

Publications (1)

Publication Number Publication Date
JPH11225004A true JPH11225004A (en) 1999-08-17

Family

ID=12604849

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4130798A Pending JPH11225004A (en) 1998-02-06 1998-02-06 Frequency adjusting method of dielectric filter

Country Status (1)

Country Link
JP (1) JPH11225004A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1024548A1 (en) * 1999-01-29 2000-08-02 Toko, Inc. Dielectric filter
US6677837B2 (en) 2001-07-17 2004-01-13 Toko, Inc. Dielectric waveguide filter and mounting structure thereof
WO2004075337A1 (en) * 2003-02-24 2004-09-02 Nec Corporation Dielectric resonator, dielectric resonator frequency adjusting method, and dielectric resonator integrated circuit

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1024548A1 (en) * 1999-01-29 2000-08-02 Toko, Inc. Dielectric filter
US6556106B1 (en) 1999-01-29 2003-04-29 Toko, Inc. Dielectric filter
US6566986B2 (en) 1999-01-29 2003-05-20 Toko, Inc. Dielectric filter
EP1363349A1 (en) * 1999-01-29 2003-11-19 Toko, Inc. Dielectric filter
US6677837B2 (en) 2001-07-17 2004-01-13 Toko, Inc. Dielectric waveguide filter and mounting structure thereof
WO2004075337A1 (en) * 2003-02-24 2004-09-02 Nec Corporation Dielectric resonator, dielectric resonator frequency adjusting method, and dielectric resonator integrated circuit
JPWO2004075337A1 (en) * 2003-02-24 2006-06-01 日本電気株式会社 Dielectric resonator, frequency adjusting method of dielectric resonator, and integrated circuit having dielectric resonator

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