Lin, S.-K.S.-K.LinYI-CHENG LIN2020-06-112020-06-11201115223965https://scholars.lib.ntu.edu.tw/handle/123456789/501666https://www.scopus.com/inward/record.uri?eid=2-s2.0-80054993978&doi=10.1109%2fAPS.2011.5996391&partnerID=40&md5=bda90a6e32e91d039f1befaddb2ab459This paper presents a novel circularly polarized (CP) aperture antenna with a hybrid modes of traveling wave and resonant wave. The antenna comprises a circular aperture with fan-shaped perturbation and a straight microstrip line for the antenna feed. Containing the inherent feature in traveling wave antennas, the presented antenna performs very wideband results, including a 10-dB return loss bandwidth of 57%, a 6-dB axial ratio (AR) bandwidth of 55%, and a 3-dB gain drop bandwidth of 55% measured at broadside. The presented antenna is printed on a PCB substrate for low manufacturing cost. We built a prototype for the presented antenna. A good agreement between simulation and measurement is achieved. © 2011 IEEE.aperture antenna; broadband antenna; Circular polarization; leaky-wave antenna; planar antenna[SDGs]SDG7Antenna feeds; Aperture antennas; Axial ratio; Broad-band antenna; Circular aperture; Circularly polarized; Hybrid mode; Leaky wave antennas; Leaky-wave; Manufacturing cost; Planar antennas; Resonant waves; Return loss bandwidth; Simulation and measurement; Traveling wave; Wide-band; Bandwidth; Circular polarization; Microwave antennas; Polarization; Traveling wave antennasconference paper10.1109/APS.2011.59963912-s2.0-80054993978