JPH0370402B2 - - Google Patents
Info
- Publication number
- JPH0370402B2 JPH0370402B2 JP56151667A JP15166781A JPH0370402B2 JP H0370402 B2 JPH0370402 B2 JP H0370402B2 JP 56151667 A JP56151667 A JP 56151667A JP 15166781 A JP15166781 A JP 15166781A JP H0370402 B2 JPH0370402 B2 JP H0370402B2
- Authority
- JP
- Japan
- Prior art keywords
- resonator
- dielectric
- hole
- dielectric block
- filter
- 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.)
- Expired - Lifetime
Links
- 230000008878 coupling Effects 0.000 claims description 11
- 238000010168 coupling process Methods 0.000 claims description 11
- 238000005859 coupling reaction Methods 0.000 claims description 11
- 239000004020 conductor Substances 0.000 claims description 10
- 239000000919 ceramic Substances 0.000 claims description 5
- 238000000151 deposition Methods 0.000 claims 1
- 230000005284 excitation Effects 0.000 description 12
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 3
- 230000005672 electromagnetic field Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
- H01P1/2056—Comb filters or interdigital filters with metallised resonator holes in a dielectric block
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Description
【発明の詳細な説明】
本発明は無線周波数用多段構成の誘電体フイル
タに関し、特にフイルタを構成する誘電体共振器
をジグザグ状に配置してフイルタの小形軽量化を
はかつたものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-stage dielectric filter for radio frequency use, and in particular, the dielectric resonators constituting the filter are arranged in a zigzag pattern to reduce the size and weight of the filter.
無線装置、特に移動無線の装置は、小形、軽量
は勿論のこと、システム構成上基地局数に対して
数倍ないし数十倍の局数となるため、無線を分離
するフイルタが多数使用されるのでフイルタの低
コスト化も移動無線システムの経済化のキーポイ
ントである。 Radio equipment, especially mobile radio equipment, is not only small and lightweight, but also has a system configuration where the number of stations is several to several tens of times the number of base stations, so many filters are used to separate radio waves. Therefore, reducing the cost of filters is also a key point in making mobile radio systems more economical.
第１図に従来例の４段構成の誘電体フイルタを
示し、イは上蓋を除去した状態の平面図、ロはイ
図のＡ−A′側断面図である。 FIG. 1 shows a conventional four-stage dielectric filter, in which A is a plan view with the top cover removed and B is a sectional view taken along line A-A' in FIG.
１は高誘電率のセラミツク（例えばチタン酸バ
リウムを主成分にしたもの）等からなる誘電体ブ
ロツクであり、金属製のケース２中に内蔵されて
いる。誘電体ブロツク１には共振器を構成するた
めに上面から下面に貫通する共振器穴３があけら
れ、その内面に導体膜による内導体４が設けられ
ている。誘電体ブロツク１の上面および長手方向
の側面２０を除くすべての面にもメタライズによ
り導体膜５が設けられていて、使用周波数に対す
る1/4波長の共振器を構成している。誘電体ブロ
ツク１の上面に導体膜を塗布すれば1/2波長の共
振器になる。隣接する２つの共振器の内導体４，
４の中間点には結合度調節用の調整穴６があけら
れ、その中に上蓋７に支持された調節棒８が挿入
されている。調節棒８は、金属または誘電体から
なり、これを上下させることにより、隣接する２
つの共振器間の結合度が調節され、誘電体加工上
の寸法誤差や誘電体のバラツキ等によるフイルタ
特性の変動が補正される。また、共振器穴３…の
上方には共振周波数微調用金属ネジ（調節棒）９
…が対向して配置され、左端と右端の共振器の外
側には共振器励振棒１３が配置され、入出力用コ
ネクタ１０に接続される。コネクタ１０よりの無
線周波入力信号はリード線１１を介して誘電体ブ
ロツク１に結合される。この場合誘電体フイルタ
と入力インピーダンスの整合は共振器励振用の励
振穴１２に挿入された励振棒１３の長さ調節によ
つて行われる。 Reference numeral 1 denotes a dielectric block made of high-permittivity ceramic (for example, one containing barium titanate as a main component), which is housed in a metal case 2. A resonator hole 3 penetrating from the upper surface to the lower surface is formed in the dielectric block 1 to constitute a resonator, and an inner conductor 4 made of a conductive film is provided on the inner surface of the resonator hole 3. A conductive film 5 is also provided by metallization on all surfaces of the dielectric block 1 except for the upper surface and the longitudinal side surfaces 20, and constitutes a resonator with a wavelength of 1/4 of the operating frequency. If a conductive film is applied to the top surface of the dielectric block 1, it becomes a 1/2 wavelength resonator. inner conductors 4 of two adjacent resonators,
An adjustment hole 6 for adjusting the degree of coupling is drilled at the midpoint of 4, and an adjustment rod 8 supported by the upper lid 7 is inserted into the adjustment hole 6. The adjustment rod 8 is made of metal or dielectric, and by moving it up and down, two adjacent
The degree of coupling between the two resonators is adjusted, and fluctuations in filter characteristics due to dimensional errors in dielectric processing, variations in dielectric, etc. are corrected. In addition, above the resonator hole 3... there is a metal screw (adjustment rod) 9 for fine tuning the resonance frequency.
... are arranged to face each other, and resonator excitation rods 13 are arranged outside the left and right end resonators, and are connected to the input/output connector 10. A radio frequency input signal from connector 10 is coupled to dielectric block 1 via lead 11. In this case, matching between the dielectric filter and the input impedance is achieved by adjusting the length of the excitation rod 13 inserted into the excitation hole 12 for excitation of the resonator.
また、出力インピーダンスと誘電体フイルタと
の整合についても、同様の手法で共振器励振用の
励振穴１２に挿入されている励振棒（図示され
ず）を調節して行う。整合されたフイルタの出力
はコネクタ１０′より出力される。 Furthermore, the matching between the output impedance and the dielectric filter is performed in a similar manner by adjusting an excitation rod (not shown) inserted into the excitation hole 12 for excitation of the resonator. The matched filter output is output from connector 10'.
上述の如く多段構成の細長いフイルタは段数の
増加によりかなり長くなり、この種のフイルタに
よつて構成される移動無線装置の空中線共振器は
大形化し、重量も増加してくる。また別の問題と
して誘電体フイルタはセラミツクス等の誘電体ブ
ロツクを焼結して製造されるため細長くなると焼
成の際、誘電体ブロツクが反つて変形するため製
品の歩留りが低下する。この対策として、誘電体
フイルタを小形化して長さを縮小化し、歩留りを
向上させるべく努力が重ねられた。 As described above, an elongated multi-stage filter becomes considerably longer as the number of stages increases, and the antenna resonator of a mobile radio device constituted by this type of filter becomes larger and heavier. Another problem is that dielectric filters are manufactured by sintering dielectric blocks such as ceramics, so if they become elongated, the dielectric blocks warp and deform during firing, reducing the yield of the product. As a countermeasure to this problem, efforts have been made to reduce the size and length of dielectric filters and improve yields.
しかし、誘電体フイルタを小形化する場合、こ
れが焼物で作成されているため、ただ単に寸法を
縮小化したのでは、かえつて寸法精度が厳しくな
ると共に、小形化による単位面積当たりの電流密
度が増加しフイルタ特性のＱも劣化し、フイルタ
の性能を低下させることになる。 However, when downsizing dielectric filters, since they are made of ceramics, simply reducing the dimensions will not only make dimensional accuracy more difficult, but also increase the current density per unit area due to miniaturization. In this case, the Q of the filter characteristic also deteriorates, resulting in a decrease in the performance of the filter.
本発明はこの解決を図らんとするものである。
この目的は、セラミツクスからなる誘電体ブロツ
クの長手方向に沿つて上面から下面まで貫通して
いる複数の共振器穴をジグザグ状に所定の間隔で
形成するとともに、前記誘電体ブロツクの上面及
び長手方向の側面を除き、該共振器穴の内面を含
むすべての面に導体膜を形成して複数の共振器を
構成し、且つ該誘電体ブロツクの短手方向の両側
面のうち、各共振器穴との間隔がより隔たつてい
る方の側面に各共振器穴と対向して溝を設け該溝
の表面に導体膜を被着させることにより、隣接す
る共振器間以外の共振器間の結合を阻止するよう
にしたことを特徴とする誘電体フイルタによつて
達成される。 The present invention attempts to solve this problem.
The purpose of this is to form a plurality of resonator holes at predetermined intervals in a zigzag pattern that penetrate from the top surface to the bottom surface along the longitudinal direction of the dielectric block made of ceramics, and to A plurality of resonators are formed by forming a conductor film on all surfaces including the inner surface of the resonator hole except for the side surfaces of the dielectric block, and each resonator hole is By providing a groove facing each resonator hole on the side surface with a larger distance between the two resonators and coating the surface of the groove with a conductive film, coupling between resonators other than between adjacent resonators can be achieved. This is achieved by a dielectric filter that is characterized in that it prevents.
かくして従来特性のままで、短小化が出来、寸
法精度も従来通りで加工費の上昇を来すこともな
い。 In this way, it can be made shorter and smaller while retaining the conventional characteristics, the dimensional accuracy remains the same, and there is no increase in processing costs.
以下、本発明の実施例の説明に先だつて、第２
図および第３図を参照して複数の共振器穴をジグ
ザグ状に所定の間隔で形成することにより誘電体
フイルタを小形化できる原理を説明する。 Below, prior to explaining the embodiments of the present invention, the second
The principle of miniaturizing a dielectric filter by forming a plurality of resonator holes in a zigzag pattern at predetermined intervals will be explained with reference to the drawings and FIG.
第２図は４段構成の誘電体フイルタの主要部を
なす誘電体ブロツクの斜視図であり、第３図は完
成した誘電体フイルタの側断面図である。なお、
誘電体フイルタの調整機構を含む上蓋と上蓋に取
り付けられた調整棒による共振周波数調整、結合
度調整及び外部回路とのインピーダンス整合調整
については第１図に示した従来技術を適用する。 FIG. 2 is a perspective view of a dielectric block forming the main part of a four-stage dielectric filter, and FIG. 3 is a side sectional view of the completed dielectric filter. In addition,
The conventional technique shown in FIG. 1 is applied to the resonance frequency adjustment, coupling degree adjustment, and impedance matching adjustment with an external circuit using the top cover including the dielectric filter adjustment mechanism and the adjustment rod attached to the top cover.
また、誘電体ブロツク部分を第１図に対応させ
て説明する。このため第２図、第３図において、
第１図と同一機能の部分には同一符号を用いてい
る。 Further, the dielectric block portion will be explained in correspondence with FIG. Therefore, in Figures 2 and 3,
The same reference numerals are used for parts having the same functions as those in FIG.
第２図は、誘電体ブロツクの長手方向に上面か
ら下面まで貫通している複数の共振器穴を各共振
器の穴が中心軸上の位置するように形成されてい
たものを、該穴をジグザグ状に配置した誘電体ブ
ロツクを示す。その長さl2は、従来の長さl1（第１
図）より当然短縮される。 Figure 2 shows a dielectric block with a plurality of resonator holes penetrating the dielectric block from the top surface to the bottom surface in the longitudinal direction. This figure shows dielectric blocks arranged in a zigzag pattern. Its length l 2 is the conventional length l 1 (first
(Figure) is naturally shorter.
誘電体ブロツク１の上面及び長手方向の側面２
０を除くすべての面には導体膜５が被着されてい
る。また、共振器の穴３の内面４にも導体膜が同
様に被着されている。 Top surface and longitudinal side surface 2 of dielectric block 1
A conductor film 5 is coated on all surfaces except zero. Further, a conductive film is similarly applied to the inner surface 4 of the hole 3 of the resonator.
以上の如く導体膜が被着された状態で、第３図
に示す金属ケース２に収納し、コネクタ１０のリ
ード線１１を入力側共振器励振用の穴１２の上面
に接続する。出力側のコネクタ１０′のリード線
も同様に穴１２′の上面に接続する。そして誘電
体ブロツクと入力インピーダンスの整合を共振器
励振用の穴に挿入されている励振棒の長さを変え
て行い整合がとれたなら接着剤で固着する。 With the conductor film coated as described above, it is housed in the metal case 2 shown in FIG. 3, and the lead wire 11 of the connector 10 is connected to the upper surface of the input side resonator excitation hole 12. The lead wire of the output connector 10' is similarly connected to the upper surface of the hole 12'. Then, the dielectric block and the input impedance are matched by changing the length of the excitation rod inserted into the resonator excitation hole, and when matching is achieved, they are fixed with adhesive.
次に共振器の穴３、結合度調整用の穴６に対向
して上蓋７に取り付けられた周波数調整用ネジ９
…及び結合度調節用棒８…を各々調整して誘電体
フイルタを構成する。 Next, a frequency adjustment screw 9 is attached to the upper cover 7 facing the resonator hole 3 and the coupling degree adjustment hole 6.
. . . and the coupling degree adjusting rod 8 . . . are adjusted respectively to form a dielectric filter.
調整終了後、入力コネクタ１０に所定の無線信
号を入力し、出力コネクタ１０′にレベルメータ
を接続して本フイルタの伝送特性を測定すると、
第１図に示す従来の誘電体フイルタの特性とほぼ
同等の特性が得られる。該当の共振器と隣接以外
の第３の共振器よりの電磁界の干渉がある場合に
は、該当の共振器と第３の共振器とのほぼ中間の
位置に導体膜を密着させた溝を形成すればよい。 After completing the adjustment, input a predetermined wireless signal to the input connector 10, connect a level meter to the output connector 10', and measure the transmission characteristics of this filter.
Characteristics almost equivalent to those of the conventional dielectric filter shown in FIG. 1 can be obtained. If there is interference from an electromagnetic field from a third resonator other than the one adjacent to the resonator, a groove with a conductive film in close contact with the resonator should be installed approximately halfway between the resonator and the third resonator. Just form it.
第４図は本発明の実施例を示す誘電体ブロツク
の斜視図で、隣接以外の共振器からの電磁界の結
合を阻止するために前記第２のジグザグ状に形成
された共振器の穴３−１〜３−４の中間にこの穴
に平行した溝１４−１〜１４−４を作り溝の内面
に導体膜を被着する。 FIG. 4 is a perspective view of a dielectric block showing an embodiment of the present invention, in which holes 3 of the second resonator are formed in a zigzag shape to prevent coupling of electromagnetic fields from resonators other than adjacent resonators. -1 to 3-4, grooves 14-1 to 14-4 parallel to the holes are made and a conductive film is coated on the inner surface of the grooves.
誘電体共振器では、内導体を中心に環状に磁界
を分布させ共振動作を行わせるようにしているた
め、溝１４−２と相対する穴３−２との間隔l4は
穴３−２と側面１′との間隔l3をl4≒l3として１４
−２と側面１′のほぼ中央に穴３−２を設けて磁
界分布の偏りをなくすようにすることが望まし
い。 In the dielectric resonator, the magnetic field is distributed annularly around the inner conductor to cause resonance operation, so the distance l 4 between the groove 14-2 and the opposing hole 3-2 is the same as that between the hole 3-2 and the hole 3-2. 14, assuming the distance l 3 from the side 1' to l 4 ≒ l 3
It is desirable to provide a hole 3-2 approximately at the center of the side surface 1' and the side surface 1' to eliminate bias in the magnetic field distribution.
かくして穴３−２の径を内導体の径とし、外導
体の径を穴３−２の直径＋l3＋l4としたインピー
ダンスをもつ共振器が形成される。また、溝１４
−１〜１４−４を形成する加工は、共振器穴およ
び結合度調整用の穴を形成する工程と同時に行う
ことができるため、加工費の上昇をもたらすこと
もない。 In this way, a resonator is formed having an impedance in which the diameter of the hole 3-2 is the diameter of the inner conductor and the diameter of the outer conductor is the diameter of the hole 3-2 +l 3 +l 4 . In addition, the groove 14
The processing for forming the holes -1 to 14-4 can be performed simultaneously with the process for forming the resonator holes and the holes for adjusting the degree of coupling, so that there is no increase in processing costs.
以上の如く形成した誘電体ブロツクを用いて、
誘電体フイルタを第３図に説明したと同様の手法
で構成すると、第１図に示す従来のフイルタ特性
と同等の結果が得られる。 Using the dielectric block formed as above,
If a dielectric filter is constructed in a manner similar to that described in FIG. 3, results equivalent to the conventional filter characteristics shown in FIG. 1 can be obtained.
本発明はもとより図示実施例に限定されるもの
でなく「特許請求の範囲」に記載された範囲内に
おいて適宜変形実施できる。 The present invention is not limited to the illustrated embodiments, but may be modified as appropriate within the scope of the claims.
第１図は従来例、第２図は共振器穴をジグザグ
状に所定の間隔で形成した構を説明する誘電体ブ
ロツクの斜視図、第３図は第２図の誘電体ブロツ
クを使用して形された誘電体フイルタの側断面
図、第４図は本発明の実施例に係る誘電体ブロツ
クの斜視図である。
図中、１は誘電体ブロツク、２は金属ケース、
３は共振器を形成する穴、４，５は導体膜、６は
結合度調整用の穴、７は上蓋、８は結合度調節用
の調節棒、９は周波数調整用ネジまたは棒、１
０，１０′はコネクタ、１１はリード線、１２，
１２′は共振器励振用穴、１３は励振棒、１４は
溝を示す。
FIG. 1 is a conventional example, FIG. 2 is a perspective view of a dielectric block illustrating a structure in which resonator holes are formed in a zigzag pattern at predetermined intervals, and FIG. FIG. 4 is a side sectional view of a shaped dielectric filter, and FIG. 4 is a perspective view of a dielectric block according to an embodiment of the present invention. In the figure, 1 is a dielectric block, 2 is a metal case,
3 is a hole forming a resonator, 4 and 5 are conductor films, 6 is a hole for adjusting the degree of coupling, 7 is an upper cover, 8 is an adjustment rod for adjusting the degree of coupling, 9 is a screw or rod for frequency adjustment, 1
0, 10' are connectors, 11 is lead wire, 12,
12' is a resonator excitation hole, 13 is an excitation rod, and 14 is a groove.
Claims (1)
方向に沿つて上面から下面まで貫通している複数
の共振器穴をジグザグ状に所定の間隔で形成する
とともに、前記誘電体ブロツクの上面及び長手方
向の側面を除き、該共振器穴の内面を含むすべて
の面に導体膜を形成して複数の共振器を構成し、
且つ該誘電体ブロツクの短手方向の両側面のう
ち、各共振器穴との間隔がより隔たつている方の
側面に各共振器穴と対向して溝を設け該溝の表面
に導体膜を被着させることにより、隣接する共振
器間以外の共振器間の結合を阻止するようにした
ことを特徴とする誘電体フイルタ。1. A plurality of resonator holes are formed in a zigzag pattern at predetermined intervals along the longitudinal direction of a dielectric block made of ceramics from the top surface to the bottom surface, and the top surface and longitudinal side surfaces of the dielectric block are formed. forming a conductor film on all surfaces including the inner surface of the resonator hole to form a plurality of resonators,
Further, of both sides in the transverse direction of the dielectric block, a groove is provided on the side facing the resonator holes on the side having a larger distance from each resonator hole, and a conductive film is formed on the surface of the groove. 1. A dielectric filter characterized in that coupling between resonators other than between adjacent resonators is prevented by depositing a dielectric filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15166781A JPS5853201A (en) | 1981-09-25 | 1981-09-25 | Conductor filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15166781A JPS5853201A (en) | 1981-09-25 | 1981-09-25 | Conductor filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5853201A JPS5853201A (en) | 1983-03-29 |
| JPH0370402B2 true JPH0370402B2 (en) | 1991-11-07 |
Family
ID=15523595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15166781A Granted JPS5853201A (en) | 1981-09-25 | 1981-09-25 | Conductor filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5853201A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1206330B (en) * | 1983-10-19 | 1989-04-14 | Telettra Lab Telefon | MULTI-CAVITY MICROWAVE FILTERS. |
| JPH0752802B2 (en) * | 1984-10-19 | 1995-06-05 | アルカテル イタリア ソシエタ ペル アチオニ | Multi-cavity microwave filter |
| JPS62142401A (en) * | 1985-12-17 | 1987-06-25 | Tdk Corp | Dielectric resonator |
| JPS62196402U (en) * | 1986-06-05 | 1987-12-14 | ||
| JPH0159304U (en) * | 1987-10-08 | 1989-04-13 | ||
| JPH0779104A (en) * | 1993-09-06 | 1995-03-20 | Murata Mfg Co Ltd | Dielectric resonator |
| US5428325A (en) * | 1993-12-10 | 1995-06-27 | Allen Telecom Group, Inc. | RF filters and multiplexers with resonator decouplers |
| FI98870C (en) * | 1994-05-26 | 1997-08-25 | Lk Products Oy | Dielectric filter |
| US6313721B1 (en) * | 1999-08-06 | 2001-11-06 | Ube Electronics, Ltd. | High performance dielectric ceramic filter using a non-linear array of holes |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3505618A (en) * | 1966-06-08 | 1970-04-07 | Marconi Co Ltd | Microwave filters |
| JPS5399849A (en) * | 1977-02-14 | 1978-08-31 | Murata Manufacturing Co | Interrdigital filter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5942726Y2 (en) * | 1979-05-30 | 1984-12-15 | ティーディーケイ株式会社 | Distributed constant filter |
-
1981
- 1981-09-25 JP JP15166781A patent/JPS5853201A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3505618A (en) * | 1966-06-08 | 1970-04-07 | Marconi Co Ltd | Microwave filters |
| JPS5399849A (en) * | 1977-02-14 | 1978-08-31 | Murata Manufacturing Co | Interrdigital filter |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5853201A (en) | 1983-03-29 |
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