High‐gain wideband circularly polarised mm‐wave antenna with highly symmetrical radiation patterns

Abstract

A circularly polarised (CP) antenna with highly symmetrical radiation patterns and wide operating bandwidth is presented for millimetre-wave (mm-wave) applications. By loading four parasitic inverted-F components around a SIW-fed S-dipole antenna, better axial ratio (AR) performance and higher gain performance are realised. Furthermore, the proposed antenna can achieve highly symmetrical radiation patterns in different elevation planes within a wide operating band. This unique feature makes it advantageous to more uniform signal coverage. To verify the effectiveness of the antenna, a prototype is fabricated and measured. The experimental results validate that the antenna covers the impedance bandwidth of 49.1% (21.2-35 GHz) and the AR bandwidth of 51.3% (20-33.8 GHz). Besides, the antenna peak gain can reach 10.42 dBic at 28.5 GHz. More importantly, the antenna can radiate extremely symmetrical and uniform waves in different elevation planes within a wide operating band (21-29 GHz). Attributed to these merits, the presented antenna shows great potential in various mm-wave systems. K E Y W O R D Scircularly polarised antenna, millimetre-wave antenna, substrate integrated waveguide, wideband antennaThis is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.