Adv Antest Corporation

Hirakawa Hewtech Corporation

Mitsuo Iwasaki

Shigeru Matsumura

Shigeru Murayama

Mitsuo Nanjyo

Katsuo Tanaka

Tetsuo Yamaguchi

Takao Ishido

Hiroyuki Kimura

Takaaki Kusama

A high-precision foamed coaxial cable includes an internal conductor constructed by stranding conductors, an insulator constructed by winding a porous tape around an outer circumference of the internal conductor, and an external conductor constructed by braiding a plurality of thin conductor wires around an outer circumference of the insulator. The insulator is formed to have a right circle external shape, an outside diameter of the insulator is formed smaller at a reduction rate of 3 to 5% than the outside diameter, immediately after the winding, of the insulator. The external conductor is formed to have a right circle external shape, an outside diameter of the external conductor is formed smaller at a reduction rate of 2 to 4% than the outside diameter, immediately after the braiding, of the external conductor, and precision of its characteristic impedance is set at &#xb1;1 &#x3a9;.

High-precision foamed coaxial cable

A foam coaxial cable, including an inner conductor, a foam insulating layer formed on the outer periphery of the inner conductor, an outer conductor formed on the outer periphery of the foam insulating layer, and an outer cover formed on the outer periphery of the outer conductor. A skin layer having a generally complete round outline is formed on the outer periphery of the foam insulating layer.

Foam coaxial cable and method of manufacturing the same

A foamed coaxial cable with high precision according to the present invention comprises: an internal conductor twisted with a plurality of electrically conductive wires; a foamed insulator with its low dielectric constant made of a porous tape body formed on the outer periphery of this internal conductor; an external conductor made of a number of electrically conductive thin wires braided on the outer periphery of this foamed insulator; and an outer sheath made of a resin having heat resistance formed on the outer periphery of this external insulator, wherein the precision of external diameter of the internal conductor is 4/1000 mm or less, the precision of external diameter size of the foamed insulator is &#xb1;0.02 mm, the insulator is formed in a completely circular shape, the precision of external diameter size of the external conductor is &#xb1;2%, the external conductor is formed in a completely circular shape, and the precision of characteristic impedance value between the internal conductor and the external conductor having the foamed insulator interposed therebetween is &#xb1;1 &#x3a9;.

High accuracy foamed coaxial cable and method for manufacturing the same

Growing community of inventors

Koga, Japan

Mitsuo Iwasaki