| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an antenna device that comprises a radio wave reflector able to miniaturize a unit structure part while maintaining a low position.SOLUTION: An antenna device comprises: a radio wave reflector (10-1) comprising a ground plate (11) and a frequency selection plate (12) placed in a form facing the ground plate (11); and an antenna (20) placed on the radio wave reflector (10-1). The frequency selection plate (12) has a structure of overlapping multiple frequency selection layers via a dielectric (13). Each frequency selection layer has a structure in which conductors (14a, 14b) having a square circumference verge with side length L are periodically set lengthwise and crosswise in array via a gap g, and the conductors (14a, 14b) of adjacent frequency selection layers are placed such that they are out of alignment by 0-0.5T (T=L+g) with each other lengthwise and crosswise.</p> |
