CIRCULARLY-POLARIZED WAVE ANTENNA HAVING DIVERSITY FUNCTION

摘要

PURPOSE: A circularly-polarized wave antenna having a diversity function is provided to transmit or receive a left and a right circularly-polarized wave signal of different transmission paths by using a first and a second circularly-polarized wave elements having a phase difference of 45 degrees therebetween. CONSTITUTION: A circularly-polarized wave antenna having a diversity function includes a reflective plate(500), a first circularly-polarized wave element(510), and a second circularly-polarized wave element(520). The first circularly-polarized wave element(510) is formed with a first dipole and a second dipole. The first dipole has an angle of 0 degree to a vertical plane of the reflective plate(500). The second dipole has an angle of 90 degrees to the vertical plane of the reflective plate(500). The second circularly-polarized wave element(520) is formed with a third and a fourth dipoles. The third dipole has the angle of 0 degree to the vertical plane of the reflective plate(500). The fourth dipole has the angle of 90 degrees to the vertical plane of the reflective plate(500). A phase difference between the first and the second dipoles and the third and the fourth dipoles is 45 degrees.