Comparison study between conventional circularly polarized patch antenna and the slot-tail compact design

A thorough comparison between the conventional microstrip circularly polarized (CP) patch antenna and the slot-tail compact one is given in this paper. By fixing the patch areas to be the same, radiation performance for these two antennas could be directly compared. Simulated results show that the slot-tail compact design does not give valuable improvements in performance compared with the traditional design. With this result in mind, the authors conclude that the miniaturization trend for CP patch antenna should be application-oriented, which means the system requirement for the CP antenna should come first. The merit of the slot-tail compact design is being flexible in the size of the whole antenna and it could be treated as a scheme for portable communication equipment.