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.