Compact Shorted Annular Ring Patch Antenna Loaded With DNG Material

This paper details the design and analysis of a miniaturized microstrip patch antenna, emphasizing its compact size and enhanced radiation. The proposed design introduces a shorted annular ring, partially loaded with metamaterial characterized by negative permittivity and permeability. The modal equation for the antenna’s cavity is derived and solved numerically. Full-wave simulation results for the return loss and radiation pattern, obtained using CST Microwave Studio, validate the predictions made by the cavity model analysis.