| 摘要 |
A FOAMED COAXIAL CABLE WITH HIGH PRECISION ACCORDING TO THE PRESENT INVENTION COMPRISES: AN INTERNAL CONDUCTOR (1) TWISTED WITH A PLURALITY OF ELECTRICALLY CONDUCTIVE WIRES; A FOAMED INSULATOR (2) WITH ITS LOW DIELECTRIC CONSTANT MADE OF A POROUS TAPE BODY (21) FORMED ON THE OUTER PERIPHERY OF THIS INTERNAL CONDUCTOR (1); AN EXTERNAL CONDUCTOR (3) MADE OF A NUMBER OF ELECTRICALLY CONDUCTIVE THIN WIRES BRAIDED ON THE OUTER PERIPHERY OF THIS FOAMED INSULATOR (2); AND AN OUTER SHEATH (4) 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 (1) IS 4/1000 MM OR LESS, THE PRECISION OF EXTERNAL DIAMETER SIZE OF THE FOAMED INSULATOR (2) IS ±0.02 MM, THE INSULATOR IS FORMED IN A COMPLETELY CIRCULAR SHAPE, THE PRECISION OF EXTERNAL DIAMETER SIZE OF THE EXTERNAL CONDUCTOR (3) IS ±2%, THE EXTERNAL CONDUCTOR (3) IS FORMED IN A COMPLETELY CIRCULAR SHAPE, AND THE PRECISION OF CHARACTERISTIC IMPEDANCE VALUE BETWEEN THE INTERNAL CONDUCTOR (1) AND THE EXTERNAL CONDUCTOR (3) HAVING THE FOAMED INSULATOR (2) INTERPOSED THEREBETWEEN IS ±1&OHgr;.FIGURE 1
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