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

A conformal circularly polarized H-plane horn antenna with broadband and low-profile characteristics is proposed in this paper, 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 circularly polarized radiation combining with the suitable phase delay provided by the transition section. The proposed antenna is wrapped around a hollow metallic cylinder with radius of 100 mm and 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 GHz to 21.7 GHz (78%). The antenna also exhibits stable radiation pattern with peak gain of 12.1 dBi and a cross-polarization below -17dB over the whole frequency range. It is observed that the measured results agree well with simulated ones.