| 摘要 |
PROBLEM TO BE SOLVED: To provide a multiple frequency common antenna for emitting a radio wave in a single direction with a high efficiency. SOLUTION: In the multiple frequency common antenna provided with: a reflection plate (3); and logarithmic periodic dipole antennas (1a, 1b) including a plurality of dipole elements (10) deposited apart from the reflection plate by a prescribed interval and emitting radio waves with different frequencies, the logarithmic periodic dipole antennas are respectively provided with parasitic elements (7a, 7b) arranged in the vicinity (e.g. a side opposite to a feeding point) of the dipole elements (10L) for emitting a radio wave with the lowest frequency. Further, the multiple frequency common antenna is provided with conductors (9a and 9b, and 9c and 9d) in pairs with each other one-side ends of which are opposed to open ends of the dipole elements for emitting the radio wave with the lowest frequency, and the other-side ends of which are connected to the reflection plate. COPYRIGHT: (C)2006,JPO&NCIPI
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