High gain dual-resonance microstrip antenna

This paper presents a high-gain, dual resonance microstrip patch antenna which operates at 4.285 GHz and 4.425 GHz. Measurement results show an input match of -21.2 dB and electric field phi-polarized gain is 8.52 dB. Cross-polarization levels are better than 30 dB. A slotted geometry was used in order to manage resonance frequencies effectively. 3-D simulations, a parametric study and implemention details are presented. The antenna geometry is very simple with three rectangular slots thereby achieving easy fabrication performance over previously published similar works in literature.