| 摘要 |
A planar antenna comprises: a patch conductor 30 which is oval and formed on the surface of a dielectric substrate 20 to be disposed obliquely with respect to an orthogonal axis of the dielectric substrate; a microstrip line 40 which feeds power to a base part of the patch conductor; and a ground conductor plate 50 which is formed on the back surface of the dielectric substrate and at a position not overlapping the patch conductor. A circular polarization characteristic with an axial ratio of 3 dB or less is obtained by forming the patch conductor with an inclination of θ, and a frequency bandwidth in which VSWR characteristic is 2 or less enables achievement of a wider bandwidth at 2-5 GHz and further a wider bandwidth in a high band of a UWB. An antenna characteristic with frequency-independent radiation directivity in a zenith direction can be obtained. |
