| 摘要 |
PROBLEM TO BE SOLVED: To reduce mutual interference between reception units, corresponding to a plurality of radio frequency bands. SOLUTION: A composite antenna device is provided with a first antenna unit 11 for communication equipment, corresponding to the radio waves in a first radio frequency band and a second antenna unit 12 for radio equipment corresponding to the radio waves, in a radio frequency band which is different from the first radio frequency band. The second antenna unit 12 is provided with a trap circuit for eliminating the interference caused by the radio waves in the radio frequency band of the first antenna unit 11. Consequently, mutual interference between the reception units, corresponding to the plurality of radio frequency bands, can be reduced. In addition, the design of the composite antenna device can be improved by composing the antennas, when the device is mounted on a vehicle. COPYRIGHT: (C)2004,JPO
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