Low angle, high angle quadrifilar helix antenna

摘要

An antenna is provided that can switch from generating a low radiation angle to a high radiation angle. The antenna comprises a quadrifilar helix antenna in which the helical antenna elements have a first pitch at one end of the antenna and a second pitch at the other end of the antenna. Controlling the phase of a driving signal and isolating one section of the antenna are steps that facilitate switching the antenna from generating a pattern with a low elevation angle or high elevation angle.