Circularly polarised equilateral-triangular microstrip antenna with truncated tip

A novel circular polarisation (CP) design of a single-feed equilateral-triangular microstrip antenna with a truncated tip is proposed and experimentally studied. It is found that, when the side length of the truncated tip is /spl sim/0.09 times that of the triangular patch, circularly polarised radiation can be achieved by using a single probe feed. Details of the antenna design are described, and experimental results of the CP performance are presented and analysed.