CPW-Fed Circularly Polarized Slot ANTENNA with Elliptical-Shaped 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 realizes 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 mm3. This new design has advantages of, supporting the ultra-wideband (UWB) systems and covering the WLAN spectrums with 3dB CP radiation and VSWR≤2 simultaneously. The numerical and experimental results of the antenna explain the superiority of the proposed antenna performance with comparison to recent similar works.