This paper presents software based design and analysis for a ‘C’- shaped slot loaded square microstrip patch antenna for multi band applications. In square patch, ‘C’ shaped slot is etched to provide multi band operation. Another design is also presented which uses two substrates (RT/Duriod and air) to achieve wideband. The designs are analyzed by FEM based HFSS™ v11.1 EM simulator software. The antenna is designed to operate in multiple frequency bands covering ISM bands, L, S and C-Band. Results of proposed antenna structure shows good return loss and VSWR and gain as depicted in graphs. The far-field radiation patterns with E-field distribution have been studied and plotted.
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