Zeroth-order Resonating Circular Patch Antenna with Triangular Stub for WLAN

In this paper, a zeroth-order resonating circular patch antenna with triangular stub is proposed. The proposed antenna has an electrical size of 0.23 lambda(0) x 0.13 lambda(0) x 0.01 lambda(0) with an impedance bandwidth (vertical bar S-11 vertical bar < -10 dB) of 21.4% (resonating frequency 2.8 GHz). Circuit values of proposed equivalent circuit have been extracted using advanced design system to plot dispersion diagram which shows zeroth order resonance. The proposed metamaterial antenna shows good radiation characteristics with a peak gain of 1.44 dBi and radiation efficiency of 94.8% at 2.8 GHz. The antenna structure shows monopole-type radiation patterns in xz-plane and dipolar-type radiation pattern in yz-plane with very low cross polarization throughout the working band.