A CPW-Fed Square Slot Circularly Polarized Antenna With Asymetrie Stubs For Ultra Wideband Applications

This paper presents a new design for a Circularly Polarized Square Slot Antenna (CPSSA). The proposed antenna is single layered with L-shaped stubs loaded on both the opposite corners of the antenna, which is capable of generating orthogonal modes for the excitation of Circular Polarization. Two asymmetric strips on the top and the left portions of the proposed antenna and various other asymmetric strips are also loaded. The proposed structure is having the dimensions of 40 x 40 x 1.6 mm
³
.The designed CPSSA operates in the range of 3.2-12.5 GHz with Axial Ratio (AR) bandwidth in the range of 4.5-8.5 GHz. In this paper the improvement of the performance parameters like AR and Return Loss (S
₁₁
) on the addition of asymmetric stubs is explained in detail.