Design of a Miniaturized Annular Ring Metamaterial Microstrip Antenna

Abstract

A miniaturized annular ring microstrip antenna is designed by loading mushroom metamaterial structures. One annular ring antenna is numerically demonstrated using low dielectric constant materials with εr = 2.2. It is observed to resonate at 2.546GHz. The effective circumference for the new annular ring antenna is 0.67λg. Note that this value is much smaller than the conventional ring antenna with a circumference of nearly λg.