| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce rush-in of electromagnetic noise to a feeding line for reception antenna of a first frequency band while a structure of an antenna portion is prevented from becoming redundant in a reception system receiving a first frequency band (AM radio broadcast band, for example) and a second frequency band (FM radio broadcast band, for example). <P>SOLUTION: An FM antenna element 12 has a cylindrical shape where an inner side becomes hollow. The feeding line 13 for an AM antenna element 11 is wired through an inner cavity of the FM antenna element 12, and a part of a radial outside in a longitudinal direction of the AM antenna element 11 is covered with the FM antenna element 12. A feeding route between an FM radio tuner 152 in a receiver 15 and the FM antenna element 12 is connected to a ground portion 156 via an inductance element 154. The inductance element 154 has a frequency characteristic in which impedance becomes relatively high in the FM radio broadcast band compared to the AM radio broadcast band. <P>COPYRIGHT: (C)2012,JPO&INPIT |
