| 摘要 |
PROBLEM TO BE SOLVED: To suppress the influence of multipath and to freely arrange a plurality of planar antennas on a substrate. SOLUTION: The planar antenna 100 includes a substrate 101 including a radio wave absorber layer, an antenna pattern 103 installed at the center of one surface of the substrate 101, and a conductor layer 109 formed with a gap 102 from the circumferential edge of the antenna pattern 103. Then, as for the planar antenna 100, when a communication wavelength used for transmission or reception in the planar antenna 100 is defined asλ, a distance from the outer circumferential end of the gap 102 to the outer circumferential end of the substrate is turned to beλ/4 or longer, and pulse signals are directly fed. COPYRIGHT: (C)2011,JPO&INPIT
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