| 摘要 |
PROBLEM TO BE SOLVED: To provide a stacked loop antenna tilting a direction of a principal beam without the need for mechanically tilting an antenna unit. SOLUTION: Stacked loop antenna elements 23a to 23d are arranged at an interval of aboutλ/2 and coupled by coupling lines 24a to 24c to configure an element array 25. The element array 25 is energized by a feeding section 26 at the coupling line 24b between the stacked loop antenna elements 23b, 23c. In this case, in order to tilt downward the direction of the principal beam by a prescribed angleθfrom a horizontal direction, the position of the feeding point is offset upward from a center 31 of the coupling line 24b toward the stacked loop antenna element 23b by a distance La. As a result, since the length of the coupling line 24b to the lower stacked loop antenna element 23c is longer than that to the upper stacked loop antenna element 23b, and the feeding phase is lagged, the direction of the principal beam is tilted downward from the horizontal direction. COPYRIGHT: (C)2005,JPO&NCIPI
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