The development of simple and inexpensive broadband antennas for various applications has played a significant role in modern wireless communication systems, attracting academics to pursue further research and investigation. Antennas have become an indispensable component of wireless communication systems front ends. In this research work, a circularly polarized (CP) asymmetrical square ring monopole antenna with the amended ground plane is designed. An asymmetrical square ring patch plus an altered ground plane will make up the CP antenna. In the broadband antenna, symmetrical step-type ground stubs are used to achieve CP. The Axial Ratio Bandwidth (ARBW) of this antenna is 1.66 GHz (3.82– 5.48 GHz), while the impedance bandwidth (IBW) is 2.39 GHz (3.95– 6.34 GHz). The FR4 dielectric is used to develop and build the CP broadband antenna, which has a miniature dimension of 25 x 25 x 1.6 mm3 and a peak gain of 3.3 dBic. The results of the tests are very similar to those of the simulations.

Circular Polarization, Compact Size, Broadband, Impedance Bandwidth, Axial Ratio Bandwidth.