JPH0743870Y2 - coaxial cable - Google Patents
coaxial cableInfo
- Publication number
- JPH0743870Y2 JPH0743870Y2 JP1989087928U JP8792889U JPH0743870Y2 JP H0743870 Y2 JPH0743870 Y2 JP H0743870Y2 JP 1989087928 U JP1989087928 U JP 1989087928U JP 8792889 U JP8792889 U JP 8792889U JP H0743870 Y2 JPH0743870 Y2 JP H0743870Y2
- Authority
- JP
- Japan
- Prior art keywords
- insulator
- coaxial cable
- conductor
- outer conductor
- groove
- 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
Landscapes
- Communication Cables (AREA)
Description
【考案の詳細な説明】 ［産業上の利用分野］ 本考案は、高周波での使用に適した同軸ケーブル、特に
伝送特性が改善された同軸ケーブルに関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a coaxial cable suitable for use at high frequencies, and particularly to a coaxial cable having improved transmission characteristics.
［従来の技術］ 従来、高周波同軸ケーブルとしては、中心導体外周に押
出し被覆した絶縁体と、絶縁体外周に巻回して設けた外
部導体と、外部導体外周に熱可塑性樹脂を押出し被覆し
たシースとからなるものが知られており、この絶縁体と
しては、 テトラフルオロエチレン−パ−フルオロアルキルビニ
ルエーテル共重合体樹脂（PFA）、テトラフルオロエチ
レン−ヘキサフルオロプロピレン共重合体樹脂（FE
P）、テトラフルオロエチレン重合体樹脂（PTFE）等の
弗素樹脂を中心導体外周に押出し被覆して形成した充実
タイプの絶縁体、 発泡PFA、発泡FEP等の弗素樹脂あるいは発泡ポリエチ
レン樹脂を中心導体外周に押出し被覆して形成した発泡
タイプの絶縁体、 等がある。[Prior Art] Conventionally, as a high-frequency coaxial cable, an insulator extruded and coated on the outer periphery of a center conductor, an outer conductor wound around the outer periphery of the insulator, and a sheath extruded and coated with a thermoplastic resin on the outer periphery of the outer conductor. Is known, and examples of the insulator include tetrafluoroethylene-perfluoroalkylvinylether copolymer resin (PFA) and tetrafluoroethylene-hexafluoropropylene copolymer resin (FE
P), tetrafluoroethylene polymer resin (PTFE) or other fluorocarbon resin extruded and coated on the outer circumference of the center conductor to form a solid type insulator, or foamed PFA, FEP or other fluororesin or foamed polyethylene resin around the center conductor There is a foam type insulator formed by extrusion coating on.
［考案が解決しようとする課題］ しかし、前記したの絶縁体からなる同軸ケーブルで
は、絶縁体が充実タイプのため実効比誘電率を低下させ
ることが不可能であり、伝送特性が改善できないという
問題がある。[Problems to be Solved by the Invention] However, in the coaxial cable made of the above-mentioned insulator, it is impossible to reduce the effective relative permittivity because the insulator is a solid type, and the transmission characteristics cannot be improved. There is.
の絶縁体からなる同軸ケーブルでは、絶縁体の固有の
特性により18GHz以上の高周波になると実効比誘電率が
大きくなり、伝送特性が改善できないという問題があ
る。The coaxial cable made of the insulator has a problem that the effective relative permittivity becomes large at a high frequency of 18 GHz or more due to the characteristic of the insulator, and the transmission characteristics cannot be improved.
本考案は前記した従来技術の欠点を改善し、高周波帯域
での伝送特性が改善された同軸ケーブルの提供を目的と
するものである。SUMMARY OF THE INVENTION The present invention aims to provide a coaxial cable having the above-mentioned drawbacks of the prior art and improved transmission characteristics in a high frequency band.
［課題を解決するための手段］ 本考案の同軸ケーブルは、中心導体外周に順次設けられ
た絶縁体、外部導体及びシースを有する同軸ケーブルに
おいて、前記絶縁体には該絶縁体の外部導体側周縁部か
ら中心導体側に向かって溝が長手方向に形成されている
と共に、該溝の形状を前記外部導体側周縁部より中心導
体側を広くするように構成したものである。[Means for Solving the Problems] A coaxial cable of the present invention is a coaxial cable having an insulator, an outer conductor, and a sheath, which are sequentially provided on the outer circumference of a central conductor, wherein the insulator has a peripheral edge on the outer conductor side. A groove is formed in the longitudinal direction from the portion toward the central conductor side, and the shape of the groove is configured such that the central conductor side is wider than the outer conductor side peripheral portion.
絶縁体としては、PEA、FEP、PTFE等の弗素樹脂及びポリ
エチレン等の熱可塑性樹脂が用いられる。As the insulator, a fluororesin such as PEA, FEP, or PTFE and a thermoplastic resin such as polyethylene are used.
［作用］ 本考案の同軸ケーブルでは、絶縁体に該絶縁体の外部導
体側周縁部から中心導体側に向かって溝が長手方向に形
成されていると共に、該溝の形状を前記外部導体側周縁
部より中心導体側を広く構成したことにより、絶縁体の
実効比誘電率が低下するから、伝送特性を大幅に改善で
きる。[Operation] In the coaxial cable of the present invention, a groove is formed in the insulator in the longitudinal direction from the outer conductor side peripheral edge of the insulator toward the center conductor side, and the shape of the groove is the outer conductor side peripheral edge. Since the central conductor side is made wider than the portion, the effective relative permittivity of the insulator is lowered, so that the transmission characteristics can be significantly improved.
［実施例］ 第１図は本考案の同軸ケーブルの一実施例を示すもので
あり、第２図は本考案の他の実施例を示すものである。[Embodiment] FIG. 1 shows an embodiment of the coaxial cable of the present invention, and FIG. 2 shows another embodiment of the present invention.
１は中心導体、２は絶縁体、３は溝、４は外部導体、５
はシースである。1 is a central conductor, 2 is an insulator, 3 is a groove, 4 is an outer conductor, 5
Is the sheath.
中心導体１は素線径0.912mmの銀メッキ軟銅線からな
り、この外周には厚さ1.04mmのPTFEの絶縁体２が押出し
被覆される。このとき、絶縁体２には外部導体４側周縁
部から中心導体１側に向かって８個の溝が長手方向に連
続に設けられると共に、その溝３の形状を外部導体４側
周縁部より中心導体１側を広く形成される。外部導体４
は厚さ0.050mm、幅0.25mmの銀メッキ軟銅箔からなり、
絶縁体２の外周に横巻に形成される。シース５は厚さ0.
3mmのFEPからなり、外部導体４外周に押出し被覆して設
けられる。The center conductor 1 is made of a silver-plated annealed copper wire having a wire diameter of 0.912 mm, and the outer periphery of the center conductor 1 is extruded and covered with a PTFE insulator 2 having a thickness of 1.04 mm. At this time, eight grooves are continuously provided in the insulator 2 in the longitudinal direction from the outer conductor 4 side peripheral portion toward the central conductor 1 side, and the shape of the groove 3 is centered from the outer conductor 4 side peripheral portion. The conductor 1 side is formed wide. Outer conductor 4
Consists of 0.050 mm thick, 0.25 mm wide silver-plated annealed copper foil,
It is formed in a horizontal winding on the outer periphery of the insulator 2. Sheath 5 has a thickness of 0.
It is made of FEP of 3 mm and is provided by extrusion coating on the outer periphery of the outer conductor 4.
このようにして製造した同軸ケーブル（第１図）の挿入
損失、反射減衰量の特性を測定した結果、18GHzの周波
数における挿入損失は1.8dB、反射減衰量は1.3dBであ
る。As a result of measuring the insertion loss and return loss characteristics of the coaxial cable (Fig. 1) manufactured in this way, the insertion loss at a frequency of 18 GHz is 1.8 dB and the return loss is 1.3 dB.
なお、比較例として、PTFEを充実押出し被覆した従来の
同軸ケーブルを製造し、前記実施例と同様に挿入損失、
反射減衰量の特性を測定した結果、18GHzの周波数にお
ける挿入損失は2.0dB、反射減衰量は−19.5dBである。As a comparative example, a conventional coaxial cable in which PTFE is fully extruded and coated is manufactured, and the insertion loss is the same as in the above-described example.
As a result of measuring the characteristics of the return loss, the insertion loss at the frequency of 18 GHz is 2.0 dB and the return loss is -19.5 dB.
［考案の効果］ 以上説明してきたように本考案の同軸ケーブルは、絶縁
体に絶縁体の外部導体側周縁部から中心導体側に向かっ
て溝が長手方向に形成されていると共に、該溝の形状を
前記外部導体側周縁部より中心導体側を広く構成したこ
とにより、絶縁体の実効比誘電率が低下するから、伝送
特性を大幅に改善できるという効果がある。[Effect of the Invention] As described above, in the coaxial cable of the present invention, the insulator is formed with the groove in the longitudinal direction from the peripheral portion of the insulator on the outer conductor side toward the central conductor side. By making the shape wider on the side of the central conductor than on the peripheral portion of the side of the outer conductor, the effective relative permittivity of the insulator is lowered, so that there is an effect that the transmission characteristics can be significantly improved.
第１図は本考案の同軸ケーブルの一実施例を示す断面説
明図、第２図は本考案の同軸ケーブルの他の実施例を示
す断面説明図である。 1:中心導体、2:絶縁体 3:溝、4:外部導体 5:シースFIG. 1 is a sectional explanatory view showing an embodiment of the coaxial cable of the present invention, and FIG. 2 is a sectional explanatory view showing another embodiment of the coaxial cable of the present invention. 1: Center conductor, 2: Insulator 3: Groove, 4: Outer conductor 5: Sheath
Claims (1)
部導体及びシースを有する同軸ケーブルにおいて、前記
絶縁体には該絶縁体の外部導体側周縁部から中心導体側
に向かって溝が長手方向に形成されていると共に、該溝
の形状を前記外部導体側周縁部より中心導体側を広く形
成したことを特徴とする同軸ケーブル。1. A coaxial cable having an insulator, an outer conductor, and a sheath, which are sequentially provided on the outer periphery of a center conductor, wherein a groove is formed in the insulator from a peripheral portion of the insulator on the outer conductor side toward the center conductor. A coaxial cable, which is formed in a direction, and in which the shape of the groove is formed wider on the central conductor side than on the outer conductor side peripheral edge portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989087928U JPH0743870Y2 (en) | 1989-07-26 | 1989-07-26 | coaxial cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989087928U JPH0743870Y2 (en) | 1989-07-26 | 1989-07-26 | coaxial cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0326923U JPH0326923U (en) | 1991-03-19 |
| JPH0743870Y2 true JPH0743870Y2 (en) | 1995-10-09 |
Family
ID=31637567
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1989087928U Expired - Lifetime JPH0743870Y2 (en) | 1989-07-26 | 1989-07-26 | coaxial cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0743870Y2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2747832B1 (en) * | 1996-04-23 | 1998-05-22 | Filotex Sa | METHOD AND DEVICE FOR MANUFACTURING A VENTILATED SHEATH IN AN INSULATING MATERIAL AROUND A CONDUCTOR, AND COAXIAL CABLE EQUIPPED WITH SUCH SHEATH |
| JP2006108030A (en) * | 2004-10-08 | 2006-04-20 | Mitsubishi Cable Ind Ltd | Coaxial cable |
| JP2010040200A (en) * | 2008-07-31 | 2010-02-18 | Fujikura Ltd | Transmission cable |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5753142Y2 (en) * | 1974-08-13 | 1982-11-18 |
-
1989
- 1989-07-26 JP JP1989087928U patent/JPH0743870Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0326923U (en) | 1991-03-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4423282A (en) | Flat cable | |
| JPH0247607Y2 (en) | ||
| CA1172321A (en) | Strip line cable | |
| CN207966502U (en) | Biaxial cable with enhancing coupling | |
| US5414215A (en) | High frequency electric cable | |
| US4649228A (en) | Transmission line | |
| JP3900864B2 (en) | 2-core parallel micro coaxial cable | |
| US5227742A (en) | Stripline cable having a porous dielectric tape with openings disposed therethrough | |
| JPH0743870Y2 (en) | coaxial cable | |
| JP2008171778A (en) | Coaxial cable | |
| US20230290538A1 (en) | Rf cable | |
| CN108091429B (en) | Differential signal cable | |
| US10825583B2 (en) | Coaxial cable | |
| US5181316A (en) | Method for making flexible coaxial cable | |
| WO2022059406A1 (en) | Coaxial cable | |
| JPH09320362A (en) | Low loss coaxial cable | |
| JPH0877843A (en) | High frequency insulated cable | |
| WO2023090417A1 (en) | Communication cable and method for manufacturing same | |
| KR101859990B1 (en) | Porous dielectric waveguide and method of preparing the same | |
| JP2538664Y2 (en) | Insulated wire | |
| WO2022131258A1 (en) | Communication cable and manufacturing method therefor | |
| TWI769882B (en) | Cables with non-circular ground bodies | |
| JPS6340881Y2 (en) | ||
| JP3596726B2 (en) | Coaxial cable with easy terminal processing | |
| WO2022138898A1 (en) | Communication cable and method for manufacturing same |