| 摘要 |
PROBLEM TO BE SOLVED: To provide a multi-frequency common use antenna system that is used in common for multi-frequencies with a low height and space factor not larger that that of a conventional antenna system. SOLUTION: The multi-frequency common use antenna system 31 of this invention consists of a capacity loaded monopole antenna 32 corresponding to a lowest frequency band among operating frequency bands, a ground plate 2 and feeding or parasitic capacity loaded monopole antennas 33, 34 corresponding to 1st, 2nd,... n-th (n is an integer being 1 or more) frequency bands higher than the lowest frequency band completely placed in a space 27 between the ground plate 2 and a feeding disk element 32a formed in parallel with the ground plate 2 in a hidden form. The antenna 32 corresponding to the lowest frequency band and any one of all the monopole antennas are energized.
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