| 摘要 |
PROBLEM TO BE SOLVED: To operate a monopole antenna and a patch antenna at a plurality of different frequencies, without extending the installation space, mutual interference and without giving adverse effect to the characteristic. SOLUTION: A through-hole 4 is provided to a center of a patch antenna, consisting of a patch antenna element 2 adhered to an upper face of a dielectric board 1 and a ground conductor 3 adhered to a lower face, a cylindrical conductor 5 is used to short-circuit the patch antenna element 2 and the ground conductor 3, a coaxial feeding part 11 is provided to the ground plate at a point deviated from the center. On the other hand, a monopole antenna element 6 is provided vertically to an upper part of the patch antenna element 2 along the center axial line of the patch antenna, and feeding is made through the through- hole 4 from a ground plate side. |
