A new CPW-fed circularly polarized square slot antenna design

In this work,a new wideband circularly polarized square slot antenna (cpssa) with a coplanar waveguide (cpw) feed is proposed. the suggested antenna is wrought of one arc-shaped,two inverted-l grounded strips around,two opposite corners of the square slot and c shaped(smile) gap on the patch. in this outline the impedance bandwidth and the axial ratio bandwidth (arbw) are increased compared to the previous cpssa designs. in this way,the 3 db axial ratio bandwidth of the designed antenna improved and reached to more than 57 % (3.2 ghz - 5.7 ghz) and the vswr (voltage standing wave ratio) < 2 impedance bandwidth increased as large as 108 % (3 ghz - 10.1 ghz). overall this work,the optimized method of the axial ratio (ar) and s11 are provided and discussed in text. the fabricated antenna results agree well with the simulation analysis.