A low profile circularly polarized antenna fed by SIW te20 mode

In this paper, a low profile circularly polarized antenna fed by TE
₂₀
mode is proposed. The antenna has a simple feeding network and microstrip line is used as feed port to excite the TE
₂₀
mode. A circular polarization convertor has been applied to achieve left hand circular polarization (CP). Energy is coupled into polarization convertor by a 2×2 slot array etched on the top surface of the second layer. The simulated results show that the designed antenna can achieve a maximum gain of 11 dBi with an impedance bandwidth of 7.5% (|S
₁₁
| <; -10 dB) from 9.58 to 10.32 GHz and 3dB axial ratio bandwidth of 5.5% (9.78 to 10.33 GHz). The designed antenna can be widely applied in millimeter-wave wireless communication systems.