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Shirzad, Hamed, Shokri, Majid, Amiri, Zhaleh, Asiaban, Somayeh and Virdee, Bal Singh (2013) Wideband circularly polarized square slot antenna with an annular patch. Microwave and Optical Technology Letters, 56 (1). pp. 229-233. ISSN 0895-2477
This article presents a novel and compact circularly polarized square slot antenna (CPSSA) that operates across 2.93–11.43 GHz with an impedance bandwidth of 118% for VSWR ≤ 2. This makes the antenna feasible for UWB applications requiring high data rate transmission. The antenna with an annular radiation patch is fed through a coplanar waveguide and includes two inverted-L shaped ground arms at two opposite corners of the slot to excite two orthogonal resonant modes for circular-polarization (CP) radiation. A semicircular stub is embedded in the feed-line to enhance its impedance bandwidth. The antenna exhibits CP bandwidth of 22.2% across 4.87–6.09 GHz, which incorporates the WLAN band. In addition, the antenna has a significantly smaller volume of 25 × 25 × 0.8 mm3. The measured and simulated results confirm the usefulness of the antenna for practical applications.
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