PURPOSE: To miniaturize and lighten the antenna system.

CONSTITUTION: The antenna system is formed by making radiation conductor elements 51 and 52 orthogonal each other while using the surface conductor foil of a both-face printed circuit board 1. A ground layer 3 is formed by using the rear face conductor foil of the bath-face printed circuit board 1. One terminal of the radiation conductor elements 51 and 52 is connected through a ground conductor part 9 composed of a through-hole to the ground layer 3, and the radiation conductor elements 51 and 52 are grounded. Thus, two pairs of antenna elements formed by using the bath-face printed circuit board 1 are formed as a grounding reverse L antenna. The outputs of the radiation conductor elements 51 and 52 as linear polarized antenna elements are synthesized by a phase shift synthesizing part 6 with phase difference at 90°, and circularly polarized waves are received. Two pairs of antenna elements are formed as the grounding antenna, the radiation conductor elements 51 and 52 are miniaturized, and the antenna system is miniaturized and lightened.