Miniaturization of waveguide antenna using square/circular arrays of SRR

A miniaturized opened ended rectangular waveguide antenna radiating below the cutoff frequency of the waveguide is investigated. Miniaturization of the waveguide is achieved by loading the antenna with electromagnetic metamaterial (MTM) consisting of Square Shaped Ring Resonators (SSRR) or Circular shaped Ring Resonators (CSRR). These metamaterials provide the waveguide the ability to support the propagation of the backward wave below the cutoff frequency. The investigated open waveguide radiator was designed and simulated using High Frequency Structure Simulator HFSStm commercial software. Comparing the former work of miniaturized waveguides, we were able to obtain miniaturized antenna with 44.5 % reduction.