JP2682646B2 - Coaxial dielectric resonator - Google Patents
Coaxial dielectric resonatorInfo
- Publication number
- JP2682646B2 JP2682646B2 JP63170413A JP17041388A JP2682646B2 JP 2682646 B2 JP2682646 B2 JP 2682646B2 JP 63170413 A JP63170413 A JP 63170413A JP 17041388 A JP17041388 A JP 17041388A JP 2682646 B2 JP2682646 B2 JP 2682646B2
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- Prior art keywords
- dielectric
- conductor
- outer conductor
- shape
- inner conductor
- Prior art date
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- 239000004020 conductor Substances 0.000 claims description 60
- 230000001629 suppression Effects 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
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Description
【発明の詳細な説明】 産業上の利用分野 本発明は高周波帯で用いられる、同軸型誘電体共振器
に関するものである。TECHNICAL FIELD The present invention relates to a coaxial dielectric resonator used in a high frequency band.
従来の技術 第７図に従来の同軸型誘電体共振器〔以後は誘電体S.
I.R（Stepped Impedance Resonator）とする。〕を示
す。これは、円筒状の外導体１と内導体２と誘電体３と
からなる同軸型誘電体共振器において、外導体１の開放
端側で軸心方向に所定長さに相当する部分だけ外径を短
絡端側に較べて小さく形成してインピーダンスを減少さ
せた共振器である。そして第７図においては、誘電体S.
I.Rの短絡端側外径を（b1）、その部分の長さを（L
1）、その部分のインピーダンスを（Z1）、開放端側外
径を（b2）、その部分の長さを（L2）、その部分のイン
ピーダンスを（Z2）、全体の長さを（LT）とする。した
がつて共振条件は、tanβL1・tanβL2＝Z2/Z1＝Ｋとな
る。Prior art Fig. 7 shows a conventional coaxial dielectric resonator [hereinafter referred to as a dielectric S.
IR (Stepped Impedance Resonator). ]. In the coaxial dielectric resonator composed of the cylindrical outer conductor 1, inner conductor 2 and dielectric 3, the outer diameter of the outer conductor 1 corresponds to a predetermined length in the axial direction. Is a resonator in which the impedance is reduced by forming smaller than the short-circuited end side. And in FIG. 7, the dielectric S.
The outer diameter of the IR short-circuit end is (b1), and the length of that part is (L1
1), the impedance of that part is (Z1), the outer diameter of the open end is (b2), the length of that part is (L2), the impedance of that part is (Z2), and the total length is (LT). To do. Therefore, the resonance condition is tanβL1 · tanβL2 = Z2 / Z1 = K.
ここで Ｋはインピーダンス比、εｒは誘電体の誘電率、Ｑ値は 1/Q＝1/Qc＋tanδ tanδは誘電体損失 ここで 但し A1＝２βL1＋sin2βL1,B1＝cos2βL1 A2＝２βL2−sin2βL1,B2＝cos2βL1/sin2βL2 δ：表皮厚 である。here K is the impedance ratio, ε r is the dielectric constant of the dielectric, and the Q value is 1 / Q = 1 / Qc + tanδ tanδ is the dielectric loss where However, A1 = 2βL1 + sin2βL1, B1 = cos 2 βL1 A2 = 2βL2-sin2 βL1, B2 = cos 2 βL1 / sin 2 βL2 δ: skin depth.
そして、第５図に示すように、上式のインピーダンス
比Ｋの値が小さいほど、スプリアス共振周波数の抑圧度
が大きくなることがわかつている。Then, as shown in FIG. 5, it is known that the smaller the value of the impedance ratio K in the above equation, the greater the degree of suppression of the spurious resonance frequency.
発明が解決しようとする課題 しかしながら、上記した従来の誘電体S.I.Rは、共振
回路におけるＱ値の劣化が大きく、この誘電体S.I.Rを
用いたフイルタの小型化を困難にしていた。However, in the above-described conventional dielectric SIR, the Q value in the resonance circuit is greatly deteriorated, which makes it difficult to downsize a filter using the dielectric SIR.
本発明は、従来の誘電体S.I.Rに比べて、Ｑ値の高い
構造の同軸型誘電体共振器を提供することを目的とす
る。An object of the present invention is to provide a coaxial type dielectric resonator having a structure having a higher Q value than that of a conventional dielectric SIR.
課題を解決するための手段 上記課題を解決するためには、本発明は角筒状の外導
体内に一つの円筒状の内導体を同軸状に配置して、この
外導体と内導体の間に誘電体を介装し、外導体と内導体
を誘電体の一端で短絡した誘電体共振器であつて、外導
体の一端から軸心方向に所定長さに相当する開放端側外
導体形状を、その外径を短絡端側外導体形状に較べて小
さくするとともに、円筒状もしくは角筒状に形成した構
成としたものである。Means for Solving the Problems In order to solve the above-mentioned problems, the present invention arranges one cylindrical inner conductor coaxially in an outer conductor having a rectangular tubular shape, and between the outer conductor and the inner conductor. A dielectric resonator in which an outer conductor and an inner conductor are short-circuited at one end of the outer conductor by interposing a dielectric on the outer conductor shape corresponding to a predetermined length in the axial direction from one end of the outer conductor. Has a smaller outer diameter than the outer conductor shape on the short-circuit end side, and is formed into a cylindrical shape or a rectangular tube shape.
さらに、本発明は角筒状の外導体内に一つの円筒状の
内導体を同軸状に配置し、この外導体と内導体の間に誘
電体を介装し、外導体の内導体を誘電体の一端で短絡し
た誘電体共振器であつて、内導体の一端から軸心方向に
所定長さに相当する開放端側内導体形状を、その内径を
短絡端側内導体形状に較べて大きくするとともに、円筒
状もしくは角筒状に形成した構成としたものである。Further, according to the present invention, one cylindrical inner conductor is coaxially arranged in a rectangular tube-shaped outer conductor, a dielectric is interposed between the outer conductor and the inner conductor, and the inner conductor of the outer conductor is In a dielectric resonator short-circuited at one end of the body, the inner conductor shape of the open end corresponding to a predetermined length in the axial direction from one end of the inner conductor has a larger inner diameter than the inner conductor shape of the short-circuited end. In addition, it is configured to have a cylindrical shape or a rectangular tube shape.
作用 上記構成において、短絡端側を円筒状にする場合と、
角筒状にする場合では、両者の外径を同じにした場合、
角筒状にする方が外導体を広く形成でき、従って、同軸
型誘電体共振器としての開放端側のインピーダンスが短
絡端側のインピーダンスに較べて小さくなるとともに、
短絡端側のインピーダンスに対する開放端側のインピー
ダンスの比、すなわちインピーダンス比が、外導体形状
を円筒状とする従来に比べて小さくなる。そして、イン
ピーダンス比が小さいほど、スプリアス共振周波数の抑
圧度が大きく、さらに、共振回路におけるＱ値の劣化が
従来に比べて抑制される。In the above configuration, when the short-circuit end side is cylindrical,
In the case of making it into a rectangular tube shape, if both outer diameters are the same,
The rectangular tube shape allows the outer conductor to be formed wider, so that the impedance on the open end side as a coaxial dielectric resonator becomes smaller than the impedance on the short circuit end side, and
The ratio of the impedance on the open end side to the impedance on the short-circuited end side, that is, the impedance ratio, becomes smaller than in the conventional case where the outer conductor has a cylindrical shape. The smaller the impedance ratio, the greater the degree of suppression of the spurious resonance frequency, and further, the deterioration of the Q value in the resonance circuit is suppressed as compared with the related art.
実施例 以下、本発明の一実施例を図面に基づいて説明する。
第１図において、外導体11は短絡端側11aを角筒状に形
成され、開放端側11bを円筒状に形成されている。ま
た、この開放端側11bは軸心方向に所定長さを有すると
ともに、短絡端側11aに較べて外径を小さく形成されて
いる。そして、外導体11の内部に同軸状に内導体12が配
置されており、外導体11と内導体12との間には誘電体13
が設けられている。この誘電体13は、BaTi4O9系磁器を
乾式成形後に焼成し、その後、開放端側を円筒状に加工
したものである。そして、外導体11および内導体12は、
誘電体13にAgメタライズによつて膜状に生成したもので
ある。そして、外導体11と内導体12は誘電体13の一端で
短絡されている。Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, the outer conductor 11 has a short-circuited end side 11a formed in a rectangular tube shape and an open end side 11b formed in a cylindrical shape. The open end side 11b has a predetermined length in the axial direction and is formed to have an outer diameter smaller than that of the short-circuit end side 11a. An inner conductor 12 is coaxially arranged inside the outer conductor 11, and a dielectric 13 is provided between the outer conductor 11 and the inner conductor 12.
Is provided. The dielectric 13 is a BaTi 4 O 9 based porcelain which is fired after dry molding, and then processed into a cylindrical shape on the open end side. Then, the outer conductor 11 and the inner conductor 12 are
The dielectric 13 is formed into a film by Ag metallization. The outer conductor 11 and the inner conductor 12 are short-circuited at one end of the dielectric 13.
そして、このように構成された誘電体S.I.Rは、短絡
端側外径（b1）、その部分の長さ（L1）、その部分のイ
ンピーダンスを（Z1）、開放端側外径を（b2）、その部
分の長さを（L2）、その部分のインピーダンスを（Z
2）、内径（a1）、全体の長さを（LT）とすると、共振
条件は tanβL1・tanβL2＝Z2/Z1＝Ｋとなる。The dielectric SIR thus configured has a short-circuit end side outer diameter (b1), a portion length (L1), an impedance of the portion (Z1), an open end side outer diameter (b2), The length of that part (L2) and the impedance of that part (Z
2), inner diameter (a1) and total length (LT), the resonance condition is tanβL1 · tanβL2 ＝ Z2 / Z1 ＝ K.
ここで Ｋはインピーダンス比、εｒは誘電体の誘電率、Ｑ値は 1/Q＝1/Qc＋tanδ tanδは誘電体損失 ここで 但し A1＝２βL1＋sin2βL1,B1＝cos2βL1 A2＝２βL2−sin2βL1,B2＝cos2βL1/sin2βL2 δ：表皮厚 である。here K is the impedance ratio, ε r is the dielectric constant of the dielectric, and the Q value is 1 / Q = 1 / Qc + tanδ tanδ is the dielectric loss where However, A1 = 2βL1 + sin2βL1, B1 = cos 2 βL1 A2 = 2βL2-sin2 βL1, B2 = cos 2 βL1 / sin 2 βL2 δ: skin depth.
そして、第７図に示した従来のものとこの実施例の誘
電体S.I.RのＱを計算し、L1,b2を変化させたときのＱ値
を、第６図に示す。Then, the Q values of the dielectric SIR of the conventional example shown in FIG. 7 and the dielectric SIR of this embodiment are calculated, and the Q values when L1 and b2 are changed are shown in FIG.
また、第１表に第６図における従来の誘電体S.I.Rの
各寸法および数値を示し、第２表に第６図における本実
施例の誘電体S.I.Rの各寸法および数値を示す。Table 1 shows the dimensions and numerical values of the conventional dielectric SIR in FIG. 6, and Table 2 shows the dimensions and numerical values of the dielectric SIR of this embodiment in FIG.
したがつて、第６図と第１表と第２表から明らかなよ
うに、この実施例によれば、Ｑ値の劣化を従来に較べて
抑制することができる。Therefore, as is clear from FIG. 6, Table 1 and Table 2, according to this embodiment, the deterioration of the Q value can be suppressed as compared with the conventional case.
また、第６図において、たとえば、従来の誘電体SIR
において、b1＝８（mm）,b2＝５（mm）,a1＝２（mm），
εｒ＝38で計算すると、Ｋ＝0.66となる。また、この実
施例において、b1＝８（mm）,b2＝５（mm）,a1＝２（m
m），εｒ＝38で計算すると、Ｋ＝0.58となる。よつ
て、この実施例によれば、従来のものよりインピーダン
ス比Ｋが小さくなる。したがつて第５図から明らかなよ
うに、この実施例によればスプリアス共振周波数（fs）
の抑圧度が大きくなる。 Further, in FIG. 6, for example, the conventional dielectric SIR
, B1 = 8 (mm), b2 = 5 (mm), a1 = 2 (mm),
When calculated with ε r = 38, K = 0.66. In this embodiment, b1 = 8 (mm), b2 = 5 (mm), a1 = 2 (m
m) and ε r = 38, K = 0.58. Therefore, according to this embodiment, the impedance ratio K becomes smaller than that of the conventional one. Therefore, as apparent from FIG. 5, according to this embodiment, the spurious resonance frequency (f s ) is
The degree of suppression of is increased.
また、第２図に示すように、外導体11の開放端側11b
は角筒状に形成してもよい。In addition, as shown in FIG. 2, the open end side 11b of the outer conductor 11 is
May be formed in a rectangular tube shape.
第３図（ａ），（ｂ）は本発明の他の実施例を示すも
のであり、先の実施例と同様の作用を行う部材について
は同一番号を付して説明を省略する。この実施例は、内
導体12の開放端12aの内径を、短絡側12bに較べて、大き
くしたものであり、開放端側12dは軸心方向に所定長さ
を有している。そして、外導体11は全長にわたつて同一
外径に形成されている。FIGS. 3 (a) and 3 (b) show another embodiment of the present invention, and the members having the same functions as those of the previous embodiment are designated by the same reference numerals and the description thereof will be omitted. In this embodiment, the inner diameter of the open end 12a of the inner conductor 12 is made larger than that of the short-circuit side 12b, and the open end side 12d has a predetermined length in the axial direction. The outer conductor 11 is formed to have the same outer diameter over the entire length.
また、第４図（ａ），（ｂ）に示すように、内導体12
の開放端側12aを角筒状に形成してもよい。In addition, as shown in FIGS. 4 (a) and 4 (b), the inner conductor 12
The open end side 12a may be formed in a rectangular tube shape.
そして、これらの実施例においても先の実施例と同様
の効果が得られる。Also, in these embodiments, the same effect as the previous embodiment can be obtained.
発明の効果 以上述べたように、本発明によれば、外導体の短絡側
形状を角筒状とし、外導体の開放端側形状を円筒状及び
角筒状として外径を小さくすることにより、もしくは、
内導体の開放端側形状を円筒状及び角筒状として内径を
大きくすることにより、従来例に比べて、Ｑ値の劣化を
小さくし、スプリアス共振周波数の抑圧も大きくするこ
とができ、また共振器長を短くし得るとともに、共振周
波数調整時の工程を簡単にすることができる。As described above, according to the present invention, the short-circuit side shape of the outer conductor is a square tube shape, and the open end side shape of the outer conductor is a cylindrical shape and a square tube shape, thereby reducing the outer diameter, Or
By making the open end side shape of the inner conductor cylindrical and square tube-shaped and increasing the inner diameter, the deterioration of the Q value can be reduced and the suppression of the spurious resonance frequency can be increased, as compared with the conventional example. The device length can be shortened and the process for adjusting the resonance frequency can be simplified.
したがつて、本発明の誘電体SIRを用いて、フイルタ
を構成することにより、挿入損失を小さくし、スプリア
ス特性を改善することが可能となり、その工業的価値は
極めて大きいものである。Therefore, by constructing a filter using the dielectric SIR of the present invention, it is possible to reduce insertion loss and improve spurious characteristics, and its industrial value is extremely great.
第１図は本発明の一実施例における誘電体S.I.Rの全体
斜視図、第２図は本発明の他の実施例における誘電体S.
I.Rの全体斜視図、第３図（ａ）は本発明のさらに他の
実施例における誘電体S.I.Rの全体斜視図、第３図
（ｂ）は第３図（ａ）のＡ−Ａ矢視断面斜視図、第４図
（ａ）は本発明のさらに他の実施例における誘電体S.I.
Rの全体斜視図、第４図（ｂ）は第４図（ａ）のＢ−Ｂ
矢視断面斜視図、第５図はインピーダンス比Ｋとスプリ
アス共振周波数／基本共振周波数との関係を示した特性
曲線図、第６図はL1,b2を変化させた場合の、従来のも
のと本発明のものとにおける共振周波数と帯域巾との比
Ｑを示した特性曲線図、第７図は従来の誘電体S.I.Rの
全体斜視図である。 11……外導体、12……内導体、13……誘電体、a1……共
振器内径、b1……短絡端側外径、b2……開放端側外径、
L1……短絡端側長さ、L2……開放短側長さ、LT……共振
器全長、Z1……短絡端側インピーダンス、Z2……開放端
側インピーダンス。FIG. 1 is an overall perspective view of a dielectric SIR in one embodiment of the present invention, and FIG. 2 is a dielectric SIR in another embodiment of the present invention.
FIG. 3 (a) is an overall perspective view of an IR, FIG. 3 (a) is an overall perspective view of a dielectric SIR in still another embodiment of the present invention, and FIG. 3 (b) is a sectional view taken along the line AA of FIG. 3 (a). FIG. 4 (a) is a perspective view showing a dielectric SI according to still another embodiment of the present invention.
An overall perspective view of R, FIG. 4 (b) is BB of FIG. 4 (a).
FIG. 5 is a characteristic perspective view showing the relationship between the impedance ratio K and the spurious resonance frequency / fundamental resonance frequency, and FIG. 6 is a conventional curve when L1 and b2 are changed. FIG. 7 is a characteristic curve diagram showing the ratio Q of the resonance frequency to the bandwidth of the invention, and FIG. 7 is an overall perspective view of a conventional dielectric SIR. 11 …… Outer conductor, 12 …… Inner conductor, 13 …… Dielectric, a1 …… Resonator inner diameter, b1 …… Short circuit side outer diameter, b2 …… Open end side outer diameter,
L1: short-circuit end side length, L2: open short side length, LT: resonator total length, Z1: short-circuit end side impedance, Z2: open end side impedance.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 吉田 明郎 大阪府門真市大字門真1006番地 松下電 器産業株式会社内 (56)参考文献 特開 昭63−187901（ＪＰ，Ａ) 特開 昭61−161806（ＪＰ，Ａ) 実開 昭62−114512（ＪＰ，Ｕ) 実開 昭58−138402（ＪＰ，Ｕ) 実開 昭52−9339（ＪＰ，Ｕ) 電子通信学会技術研究報告、ＭＷ79− 44 「ＵＨＦ帯小形同軸共振器の−設計 法」 （昭和54年） 牧本，山下，Ｐ. 15−22 （図−８) 「振動子・共振子・フィルタ最新技術 ’86年版」 株式会社総合技術出版発 行、1985年10月30日 Ｐ．189−192、 ５．誘電体フィルタの項 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akio Yoshida 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) Reference JP-A-63-187901 (JP, A) JP-A-61- 161806 (JP, A) Actual development Sho 62-114512 (JP, U) Actual development Sho 58-138402 (JP, U) Actual development Sho 52-9339 (JP, U) IEICE technical report, MW79-44 UHF Band Small Coaxial Resonator-Design Method "(1979) Makimoto, Yamashita, P. 15-22 (Fig. 8)" Recent Transducer / Resonator / Filter Technology '86 Edition " Line, October 30, 1985 P. 189-192, 5. Dielectric filter section
Claims (2)
を同軸状に配置し、この外導体と内導体の間に誘電体を
介装し、外導体と内導体を誘電体の一端で短絡した同軸
型誘電体共振器であって、外導体の開放端から軸心方向
に所定の長さに相当する開放端側外導体形状を、その外
径を短絡端側外導体形状に較べて小さくするとともに、
円筒状もしくは角筒状に形成した同軸型誘電体共振器。1. A cylindrical inner conductor is coaxially arranged in a rectangular tubular outer conductor, and a dielectric is interposed between the outer conductor and the inner conductor, and the outer conductor and the inner conductor are dielectrically insulated. A coaxial dielectric resonator short-circuited at one end of the body, the outer conductor shape having an open end side corresponding to a predetermined length in the axial direction from the open end of the outer conductor, and the outer diameter of the outer conductor It is smaller than the shape,
A coaxial dielectric resonator formed in a cylindrical shape or a rectangular tube shape.
を同軸状に配置し、この外導体と内導体の間に誘電体を
介装し、外導体と内導体を誘電体の一端で短絡した同軸
型誘電体共振器であって、内導体の開放端から軸心方向
に所定の長さに相当する開放端側内導体形状を、その内
径を短絡端側内導体形状に較べて大きくするとともに、
円筒状もしくは角筒状に形成した同軸型誘電体共振器。2. A cylindrical inner conductor is coaxially arranged in a rectangular tube-shaped outer conductor, and a dielectric is interposed between the outer conductor and the inner conductor to insulate the outer conductor and the inner conductor. A coaxial type dielectric resonator short-circuited at one end of the body, the inner conductor shape of which is the open end side corresponding to a predetermined length in the axial direction from the open end of the inner conductor, and the inner diameter of which is the inner conductor shape of the short-circuited end. It is larger than
A coaxial dielectric resonator formed in a cylindrical shape or a rectangular tube shape.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63170413A JP2682646B2 (en) | 1988-07-07 | 1988-07-07 | Coaxial dielectric resonator |
| US07/375,417 US4985690A (en) | 1988-07-07 | 1989-07-05 | Dielectric stepped impedance resonator |
| GB8915504A GB2222490B (en) | 1988-07-07 | 1989-07-06 | A coaxial dielectric resonator. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63170413A JP2682646B2 (en) | 1988-07-07 | 1988-07-07 | Coaxial dielectric resonator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0220103A JPH0220103A (en) | 1990-01-23 |
| JP2682646B2 true JP2682646B2 (en) | 1997-11-26 |
Family
ID=15904465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63170413A Expired - Fee Related JP2682646B2 (en) | 1988-07-07 | 1988-07-07 | Coaxial dielectric resonator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2682646B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2753096B2 (en) | 1989-02-16 | 1998-05-18 | 松下電器産業株式会社 | Coaxial dielectric resonator |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03143103A (en) * | 1989-10-30 | 1991-06-18 | Toko Inc | Dielectric resonator |
| JPH0793527B2 (en) * | 1990-11-30 | 1995-10-09 | 富士電気化学株式会社 | Coaxial dielectric resonator |
| JP2836255B2 (en) * | 1990-12-28 | 1998-12-14 | 松下電器産業株式会社 | Coaxial dielectric resonator |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61161806A (en) * | 1985-01-11 | 1986-07-22 | Mitsubishi Electric Corp | High frequency filter |
| JPS62114512U (en) * | 1986-01-13 | 1987-07-21 | ||
| JPS63187901A (en) * | 1987-01-30 | 1988-08-03 | Murata Mfg Co Ltd | Dielectric filter |
-
1988
- 1988-07-07 JP JP63170413A patent/JP2682646B2/en not_active Expired - Fee Related
Non-Patent Citations (2)
| Title |
|---|
| 「振動子・共振子・フィルタ最新技術’８６年版」 株式会社総合技術出版発行、１９８５年１０月３０日 Ｐ．１８９−１９２、５．誘電体フィルタの項 |
| 電子通信学会技術研究報告、ＭＷ７９−４４ 「ＵＨＦ帯小形同軸共振器の−設計法」 （昭和５４年） 牧本，山下，Ｐ．１５−２２ （図−８） |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2753096B2 (en) | 1989-02-16 | 1998-05-18 | 松下電器産業株式会社 | Coaxial dielectric resonator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0220103A (en) | 1990-01-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |