PLANAR ANTENNA

PROBLEM TO BE SOLVED: To provide a planar antenna capable of making the side lobe level low by reducing a gap generated between substrates and suppressing variations in characteristics between antennas low. SOLUTION: A radiation element substrate 2, a metal plate 5 and a feeding line substrate 6 are provided so as to be laminated, and feeding pins 10 each couple a feed point of each radiating element 3 provided on the substrate 2 with each feed line 8 on the substrate 6. On the substrate 6 and the metal plate 5, a plurality of, e.g. two screw holes 15 are provided at a position less than 1/4 λg (λg: wavelength in substrate) from each of the feed points in the feeding line 8, and screws 16 are each screwed through the holes 15, thereby removing the gap between the substrate 6 and the metal plate 5 to prevent disturbance of excitation distribution. COPYRIGHT: (C)2005,JPO&NCIPI