| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an antenna device complying with a plurality of communication systems and making the respective bands wide. <P>SOLUTION: The antenna device comprises: a first antenna element 1 resonating with a first frequency; a second antenna element 2 provided at the vicinity of the first antenna element 1, capacitively coupled to the first antenna element 1, and resonating with a second frequency different from the first frequency; phase converters 5, 6 connected to the feeding point of the first antenna element 1 and that of the second antenna element 2, respectively, and adjusting impedance; and band-pass filters 7, 8 connected to each of the phase converters 5, 6, respectively, and passing through a given frequency only. The impedance is adjusted, in feeding to one antenna element, by adjusting the phase converters 5, 6 connected to the other antenna element so that the other antennal element may operate as an parasitic element. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
