| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem that winding intervals of a coil are not set as designed by a contraction effect and an elastic force of the coil when resin is solidified and a resonance frequency of the coil for an antenna shifts from a designed value, when the whole coil is fixed with thermoplastic resin. SOLUTION: As for the coil for antennas, the coil 1 is formed by winding a conducting wire around a jig 4 with a cut screw groove a plurality of times to form the coil, a part on the conducting wire wound around the jig is covered with the thermoplastic resin 2, the thermoplastic resin is heated while using the jig to fix the coil, and the coil having an air core is formed by pulling the jig from the coil while rotating the jig. COPYRIGHT: (C)2011,JPO&INPIT
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