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Abstract
This article proposes a novel printed slot antenna with circular polarization characteristics for X-band applications. By using a modified L-shaped ring radiating stub, and also by inserting a U-shaped strip with an open stub inside it protruded on the ground plane, additional resonances are excited and, hence, much wider impedance bandwidth can be produced, especially at the higher band. By using these structures, very good axial-ratio bandwidth is obtained. The operating frequencies of 8.213 to over 11.87 GHz with circular polarization characteristics 8.32–10.79 GHz. Simulated and experimental results obtained for this antenna show that it exhibits good radiation behavior within the X-band frequency range. The designed antenna has a small size of 20 × 20 mm2.