A High-gain Conical Conformal Antenna with Circularly Polarization and Axial Radiation in X-band

A high-gain conical conformal antenna with right-hand circularly polarization (RHCP) and axial radiation is proposed in this paper. A double rhombus antenna with nine director strips is used to obtain the high-gain end-fire pattern. The four conformal elements evenly arranged on the cone are fed by the 1-to-4 Wilkinson feeding network with a 90° sequential phase difference to obtain an axial RHCP radiation. The simulation results show that the proposed antenna achieves an impendence bandwidth of 17.7% from 8.85 GHz to 10.57 GHz with the gain greater than 9.33 dBi, and the axial ratio of axial radiation is less than 1.85 dB in the operating band. The proposed antenna has a very low profile of 0.008λ
₀
, which should be useful in the communication system of missile and aircraft applications in X-band.