Patent ID: 8610634

Claim:
A multi-frequency circular polarization antenna comprising first and second multi-frequency antennas, each including a configuration in which a first antenna and a second antenna are arranged in a substantially mirror-symmetrical manner, wherein: the first antenna has a plurality of oscillation frequencies and comprises a first input/output terminal, a first antenna conductor, a series circuit of a first inductor and a first capacitor, the series circuit connecting the first input/output terminal and the first antenna conductor, and a second inductor, one end of which is connected to the first antenna conductor; the second antenna has a plurality of oscillation frequencies and comprises a second input/output terminal, a second antenna conductor, a series circuit of a third inductor and a second capacitor, the series circuit connecting the second input/output terminal and the second antenna conductor, and a fourth inductor, one end of which is connected to the second antenna conductor and the other end of which is connected to the other end of the second inductor; and the first multi-frequency antenna and the second multi-frequency antenna are arranged to make a predetermined angle that is less than 90 degrees, such that a center point of the first multi-frequency antenna and a center point of the second multi-frequency antenna overlap, and the other end of the fourth inductor of the first multi-frequency antenna is connected to the other end of the fourth inductor of the second multi-frequency antenna.