Abstract

This paper presents the design and analysis of a compact multiband concentric spiral microstrip patch antenna for S-Band and C-Band wireless communication applications. The proposed antenna consists of a circular disc radiating patch with three concentric ring-shaped slots etched on its surface to enable multiband operation. The antenna is designed on an FR-4 dielectric substrate with a relative permittivity of 4.4 and thickness of 1.6 mm. The design and performance evaluation are carried out using CST Studio Suite 2024. Simulation results demonstrate that the antenna achieves triple-band resonance at 2.7 GHz in the S-Band and at 5.145 GHz and 5.685 GHz in the C-Band, with a minimum return loss (S11) of ?41.81 dB and VSWR values of 1.016, 1.515, and 1.152 at the respective resonant frequencies. The compact structure, low VSWR, and satisfactory radiation performance confirm that the proposed antenna is suitable for satellite communication, WLAN, and radar sensing applications in the S-Band and C-Band frequency ranges.