| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna device that irradiates two radio waves having different frequencies, can arbitrarily set the angle of radiation of radio waves in a different vertical direction (a vertical surface) for each frequency, or can arbitrarily set radiation suppression of radio waves in the specified azimuth in the horizontal direction. SOLUTION: In the antenna device 1, a plurality of antennas 2a, 3a are arranged in a vertical or horizontal direction to the earth, two radio waves whose frequencies are different are irradiated from each of the antennas 2a, 3a, each of low-pass filters 20a, 21a having frequency-phase characteristics differing from those of coaxial pipes 12a, 13a is inserted into feeder line systems 4, 5 including the coaxial pipes 12a, 13a of the antenna device 1, or, especially, each of the low-pass filters 20a, 21a is inserted between power dividers 8, 9 of the feeder line systems 4, 5 and each of branch cables 6a, 7a connected to each of the antennas 2a, 3a (or each element) in series. COPYRIGHT: (C)2005,JPO&NCIPI
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