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A new form CPW-fed broadband circularly polarized square slot antenna (CPSSA) with three inverted-L-shape grounded strips around the corners of the slot is proposed and fabricated. In comparison to the previous CPSSA structures, the axial-ratio (AR) bandwidth of the antenna is increased, which is two times wider than the previous proposed design. By embedding the L-shape strip to the ground plane and using the vertical stub to the feed line, very good axial-ratio bandwidth is obtained. The measured impedance bandwidth and AR of the realized CPSS antenna with optimized parameters is from 2 to 7 GHz (3.5:1, 110%) for VSWR 2 and 2-5 GHz (2.5:1; 85%) for AR 3 dB respectively. Throughout this letter, the improvement process of the AR and 11 properties is completely presented and discussed.Index Terms-Axial ratio (AR), broadband, circularly polarized (CP), square slot antenna.

A new circularly polarized CPW antenna is presented. Total size of the antenna is 60 Â 60 Â 0.8 mm 3 which is fabricated on a low cost FR4 substrate. The measured bandwidth of the proposed antenna is from 2 up to 6.68 GHz for VSWR < 2, and also the measured axial-ratio (AR) bandwidth is almost 4

This paper presents a compact wideband circularly‐polarized square slot antenna (CPSSA). The antenna is a coplanar waveguide feed structure with three T‐stubs toward the slot center and one semi‐circle tuning stub was etched to the feed line and modified inverted L‐shaped strips around the corners of the ground. Moreover, two spiral slots were loaded in the ground plane for exciting currents in a different direction. A prototype of the designed antenna is fabricated and measured to confirm the simulation results. A reasonably good agreement between the measured and simulated results in terms of the reflection coefficient <−10 dB and axial ratio are achieved. The 3‐dB axial ratio bandwidth achieved by the combination is from 4.35 to 8.15 GHz (60%, measured). The designed CPSSA has a compact size of 0.57λₒ × 0.57λₒ × 0.0116λₒ at the center frequency and fabricated on the FR4 substrate.