MULTIFREQUENCY MICROSTRIP ANTENNA

摘要

[PROBLEMS] To provide a multifrequency microstrip antenna (MSA) in which a large number of frequencies can be shared and the frequencies can be set arbitrarily. [MEANS FOR SOLVING PROBLEMS] The MSA comprises, as antenna elements (22), annular antenna elements (221, 222, 223) constituted of an annular and planar conductive path having external shapes symmetrical with respect to the center line and a planar antenna element (227) formed inside the annular antenna element (223) and also comprises, as a feeding means to the antenna elements (22), an L probe (24) for feeding the annular antenna elements (221-223) or the planar antenna element (227) through electromagnetic coupling at the intersection of the center line and the annular antenna elements (221-223) or the planar antenna element (227). A current path is formed in each annular antenna element (221-223) and the planar antenna element (227) and each current path resonates at a different resonance frequency to exhibit multifrequency sharing characteristics.