Conformal Wideband Circularly Polarized H-Plane Horn Antenna Integrated With Quasi-Yagi

A conformal circularly polarized (CP) H-plane horn antenna with broadband and low-profile characteristics is proposed in this communication, which is integrated with quasi-Yagi and wrapped around a hollow cylinder. The H-plane horn based on bent corrugated substrate integrated waveguide (BCSIW) technology and the quasi-Yagi with fan-shaped driving elements provide the vertical and horizontal linear-polarized waves, respectively, which generates CP radiation combined with the suitable phase delay provided by the transition section. The proposed antenna is wrapped around a hollow metallic cylinder with a radius of 100 mm and a height of 90 mm. The measured voltage standing wave ratio (VSWR) of the fabricated antenna is less than 2.0 in the frequency range over 9.4 GHz (81%), while the axial ratio (AR) is below 3 dB from 9.4 to 21.7 GHz (78%). The antenna also exhibits a stable radiation pattern with a peak gain of 12.1 dBi and a cross-polarization below -17 dB over the whole frequency range. It is observed that the measured results agree well with simulated ones.