“…Besides, a hook-shaped monopole antenna 15 with 61% 3-dB ARBW is proposed by introducing an asymmetric L-shaped arm into the microstrip feeding line. Additionally, multiband circularly polarized monopole antenna (CPMA) is also investigated by using some perturbation strips in ref, [20][21][22][23][24] such as X-shaped slit, 20 "T," "I" and "E"shaped slots, 21 I-shaped strips, 22 T-and L-shaped strips, 23 a slit, 24 slit-loaded semi-circular patch, 25 inverted-L strip, 26 and two orthogonal stubs. 27 In this article, a novel wideband CPMA with modified characteristics is proposed.…”