The invention discloses a flexible ultra-
wideband circularly-polarized antenna, and belongs to the technical field of
time domain ultra-
wideband antennas. The invention provides a planar printing antenna on a flexible
dielectric layer, and the antenna comprises an antenna floor, a
radiation unit and a feed unit, wherein the
radiation unit and the feed unit are arranged on the antenna floor, and the antenna floor comprises a flexible substrate and a conductive layer arranged on the top surface of the flexible substrate; the surface of the conductive layer is etched to form a pair of mutually independent closed
radiation slot rings, and the closed radiation slot rings are crescent-shaped, and a pair of arc-shaped conductive
coupling patches separated by the radiation slot rings are in
central symmetry to form an S-shaped double-arm spiral
dipole; and the feed unit adopts a
coplanar waveguide feed structure. According to the design of the antenna, the antenna is endowed with circularly-polarized radiation performances, the overall profile is extremely low, the process is simple, the cost is low, the antenna is bendable and more portable, the antenna is wearable, and the antenna is suitable for the ultra-
wideband positioning technology.