volume | PIER Journals

Abstract

In this paper, a novel, compact, broadband circularly polarized (CP) semi-hexagonal monopole antenna is proposed. The antenna integrates a rectangular open loop and nonuniform asymmetric ground planes. The proposed design is fabricated on a 1.6 mm thick FR4 substrate with overall dimensions of 0.83λ_c × 0.70λ_c × 0.021λ_c at the center frequency f_c = 3.935 GHz. It achieves an impedance bandwidth of 4.51 GHz (1.68-6.19 GHz, 114.63%) and an axial ratio bandwidth of 2.6 GHz (2.3-4.9 GHz, 72.3%). The antenna offers realized gains of 1.4 dBi and 0.5 dBi, with corresponding efficiencies of 64% and 51% at 2.4 GHz and 3.5 GHz, respectively. It exhibits right-handed circular polarization (RHCP) across the ISM and WiMAX frequency bands. Furthermore, the antenna's performance is validated in a realistic environment using an Arduino-based wireless voltage monitoring system, demonstrating reliable data transmission with minimal loss. These results confirm the antenna's suitability for IoT applications requiring stable and efficient wireless communication.

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Ms. Sasmita Kumari Nayak

Dr. Sanjeev Kumar Mishra