| 摘要 |
PROBLEM TO BE SOLVED: To obtain the antenna system that uses a plurality of frequencies in common and has a broadband characteristic. SOLUTION: This antenna system is provided with a 1st linear dipole 13 that has a resonance frequency around a frequency f1 and is fed by a feeder 16, a 2nd linear dipole 14 for preventing a narrowed band that has a resonance frequency at a frequency f1αnear the frequency f1 and higher than the frequency f1, 3rd and 4th linear dipoles 15, 18 having the resonance frequency near frequencies f2, f3, a 5th linear dipole 19 for preventing a narrowed band that has a resonance frequency at a frequency f3αnear the frequency f3 and higher than the frequency f3 and a reflection plate 17.
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