| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna system which has wide band characteristics such that the antenna system can be used for plural frequency bands. SOLUTION: A grounding plate 11 has a coaxial plug 12 mounted in its reverse center, and its center conductor 13 is projected on the top side of the grounding plate 11. In the upper center of the grounding plate 11, a rectangular printed board 14 is arranged vertically and held by metal plates 15a and 15b. The printed board 14 has a semicircular copper foil 14 vapor-deposited on one surface facing the center conductor 13 of the coaxial plug 12 and belt-like copper foil 14b vapor-deposited on the other surface closely to the grounding plate 11. The semicircular copper foil 14a is connected to the center conductor 13 nearby the top of the arc. Furthermore, the upper ends of metal plates 15a and 15b are fixed to both the sides of the upper end of the printed board 14 with a screw 16, and the semicircular copper foil 14a and the metal plates 15a and 15a and 15b are connected electrically. The metal plates 15a and 15b are so arranged that an angle θ with respect to the printed board 14 is 30 to 45 deg., and the lower part of the printed board is connected to the grounding plate 11. |
