Patent ID: 7586443

Claim:
A leakage loss line type circularly-polarized wave antenna, comprising: at least three conductor lines including losses by electromagnetic radiation, the at least three conductor lines being connected to a single power feed point, the power feed point comprising a signal line connection point electrically connected to a signal line, and a ground line connection point electrically connected to a ground line, wherein: the conductor lines are projected onto a plane perpendicular to a straight line that connects the power feed point and one point in a distance from the power feed point, the signal line connection point, the ground line connection point, and the conductor lines are coplanar, a sum of the projections of high-frequency current induced on the conductor lines onto any two orthogonal axes set on a plane of complex vectors is taken for each axis, a ratio of absolute values for the amplitude of each sum is 0.7-1.3, and an absolute value of the phase difference in the axes is 80-100 degrees.