| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an antenna device to realize a multifrequency common-use antenna of a non-directional type which has the same size as a single-frequency antenna, which can secure high gain, and which can allow for tilt control. <P>SOLUTION: An antenna device comprises: dipole antennas which are different according to the frequency of the electric wave they radiate and which are positioned in multisteps along the same central axis; coaxial feed lines which are provided for each dipole antenna of a different frequency to feed in the same feed phase and which are respectively positioned to go through the inside of the dipole antennas along the same central axis. <P>COPYRIGHT: (C)2012,JPO&INPIT |
