摘要 |
<P>PROBLEM TO BE SOLVED: To provide an antenna system which has a plurality of resonant frequencies, the antenna system having a large antenna gain as compared with conventional technology, and a radio communication device using the same. <P>SOLUTION: The antenna system is constituted by connecting at least one dipole antenna 101 and at least one colinear antenna 201, which have mutually different resonant frequencies, at a feed point 300 in parallel. The dipole antenna 101 and colinear antenna 201 are arranged on the substantially one straight line in parallel to each other. Further, included is a balun 17 which is interposed between the feed point 300 and a coaxial cable 50 as an unbalanced type feeder line and 1/4 time as long as the mean value of the resonant frequencies of the plurality of antennas 101 and 201. <P>COPYRIGHT: (C)2005,JPO&NCIPI |