| 摘要 |
A plurality of cylindrical inner conductor portions (101-111) having different diameters are connected with each other to form an inner conductor. The inner conductor portions (101-111) include high-impedance portions (101,103,105,107,109,111) and low-impedance portions (102,104,106,108,110). The inner conductor (101-111) is formed within an outer conductor (2) with nonuniform inner diameter. The inner conductor is formed so that the axial length of some of the inner conductor portions forming the high-impedance portions (201,203,205,207,209,2011) is smaller than the axial length of the other inner conductor portions forming the high-impedance portions, and the diameter of the inner conductor portions forming the high-impedance portions (201,203,205,207,209,211) is greater than a predetermined minimum diameter. <IMAGE>
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