| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a compactly formed multiband antenna capable of avoiding mutual interference between a first antenna element 20 and a second antenna element 22. <P>SOLUTION: The fixed end of the first antenna element 20 for a low frequency band and that of the second antenna element 22 for a high frequency band are electrically connected at a some feeding point 12. The electric length of the first antenna element 20 is set to be 1/2 of the wavelength of the high frequency band, and its top end is set open without being grounded and short-circuited. The electric length of the second antenna element 22 is set to be 1/4 of a wavelength of the low frequency band, and its top end is grounded and short-circuited. The impedance of the second antenna element 22 to the low frequency band is infinite, while the impedance of the first antenna element 20 to the high frequency band is infinite. The first and second antenna elements 20 and 22 do not cause mutual interference and perform antenna operation independently. <P>COPYRIGHT: (C)2008,JPO&INPIT |
