cpw-fed circularly polarized slot antenna with ellipticalshaped patch for uwb applications

A new design of coplanar waveguide (cpw)-fed antenna with circular polarization (cp) and excellent impedance matching is presented. in this design a pair of circular-shaped slits is applied to opposite corners of the slot for enhancing the impedance matching and realizing bandwidth of 134.43 % across 2.98-15.20 ghz for vswr ≤ 2. furthermore, this structure exhibits axial ration bandwidth (arbw) of 36.22 % across 4.43-6.39 ghz by embedding two inverted l-shaped ground arms in the slot. the total dimension of the proposed antenna is 25 × 25 × 0.8 mm^3. this new design has advantages of, supporting the ultra-wideband (uwb) systems and covering the wlan spectrums with 3 db cp radiation and vswr ≤ 2 simultaneously. the numerical and experimental results of the antenna explain the superiority of the proposed antenna performance in comparison with recent similar works.