Design of 2.45 GHz ESA metaresonator

Abstract

This paper shows the analysis of a typical Printed Circuit Board (PCB) Split Ring Resonator (SRR) Electrically Small Antenna (ESA) based on lumped circuit model. Having technical limitations such as 5 mils copper trace width and trace separation of 3.5 mils, it inherently lacks sufficient resistance to operate efficiently. Through a series of different SRR configurations, this can be improved to shift the SRR ESA to resonate at a lower frequency. A planar configuration of Four Stubs Hexagonal Double SRR (FSHD-SRR) ESA metaresonator is proposed to operate sufficiently to cover the WiFi 2.4 GHz band. Then, the proposed design is simulated and fabricated over the entire WiFi 2.4 GHz frequency range from channels 1 (2.412 GHz) to 13 (2.472 GHz) with a reflection coefficient, S11 of less than −10 dB for the extreme channels and −30 dB for the center channel 7 (2.442 GHz).