| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an antenna device which can perform high-accuracy orientation detection with a simple (inexpensive) configuration by suppressing the influence of a phase folding (false image) in a detection angle range that is an angle range of at least orientation detection target. <P>SOLUTION: A transmission antenna 30 is made up of a plurality of transmission-side unit antennas 31, 32, 33 and 34 spaced a predetermined transmission-side arrangement interval Dt apart along a preset arrangement direction. A plurality of receiving antennas 10 and 20 are respectively spaced a predetermined arrangement interval Dd apart along the arrangement direction. These receiving antennas 10 and 20 are respectively made up of a plurality of receiving-side unit antennas 11 and 12 (21 and 22) spaced the predetermined receiving-side arrangement interval Dr apart along the arrangement direction. The receiving-side arrangement interval Dr is larger than the transmission-side arrangement interval Dt. <P>COPYRIGHT: (C)2013,JPO&INPIT |
