To provide a phase distribution type antenna having a structure of a set of narrow conductor lines realizing circular polarization operation with a thin plate small dimension structure without employing the wavelength shortening effect of such as a dielectric, and to provide a high frequency module employing that antenna.

The antenna comprises a set of narrow conductor lines 2a, 2b, 2c, 2d where the set is developed in a two-dimensional plane. Complex vector sum of the projection of a current induced at each point of the developed conductor line 2a, 2b, 2c, 2d in two directions set in the same plane to intersect perpendicularly have the same amplitude and a phase difference of 90°.