This paper presents general approach to design a novel coaxial fed square ring microstrip patch antenna. Software based design and analysis has been done for a square ring patch antenna using different substrate materials. The effect of substrate permittivity on resonant frequency, bandwidth and gain was studied and analyzed for square ring patch antenna. A coaxial probe fed square ring microstrip patch antenna operating at C-band (4-8 GHz) was analyzed on different substrate materials like Rogers RT/duroid 5880, Rogers RT/duroid 5870, Neltec NX9240 and Arlon DiClad 527. The design was analyzed by finite element method (FEM) based HFSS™ EM simulator software. Return loss, VSWR plot, smith chart and radiation pattern plots are observed and plotted for all designed antennas.
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