Design and Optimization of a Pentaband Offset Feed Closed Ring Resonator Antenna for Wireless Applications

This paper presents a compact Offset Feed Split Ring Resonator (SRR) antenna, fabricated on an FR4 substrate measuring 42.80 48.60 1.6 mm.Designed for multiband operation, it spans 2.95 GHz to 6.11 GHz, catering to voice communication, WiMAX, 5G, WLAN, and ISM applications.Multiband functionality is achieved through a dual-ring SRR, with parametric analysis optimizing patch and SRR dimensions for enhanced performance.The antenna achieves an 83% efficiency, ensuring effective energy transfer.Specific Absorption Rate (SAR) analysis confirms values below 2 W/kg, meeting safety standards.Simulation and experimental results closely align, validating the design.Its compact size, stable radiation pattern, low SAR, and wideband operation make it a promising candidate for next-generation wireless communication and medical applications, including cancer detection.The simple, efficient design underscores its potential for future wireless and healthcare advancements.The dual-ring structure and parametric optimization enable stable radiation patterns across required frequencies, contributing significantly to antenna technology.Its integration into diverse communication protocols and safety features is vital for medical applications.This design offers a significant advancement in compact, efficient, and safe antenna solutions.