Analytical approach for designing edge fed rectangular slotted Microstrip antenna

An analytical model for designing, an edge fed rectangular slotted Microstrip antenna (MSA) is proposed. The introduction of slots on the patch results in lowering of resonant frequency. A blind trial and error method of analysis is adopted to study the effects due to introduction of slots in numerous simulation softwares and no analytical approach is proposed till now. In this paper, an analytical approach to design an edge fed rectangular slotted MSA is presented. The curves, shift in resonant frequency vs Ring width and Return loss corresponding to shifted frequency vs Ring width have been studied and the best fit equations have been derived. Comparison of simulated results and values obtained from the derived equations shows that they are approximately equal. The derived equations are valid at a specific design frequency and can be used as an open source to find or predict the useful shift of resonant frequency from original designed frequency due to the introduction of slots without the aid of simulation softwares. The antenna simulations are carried out in HFSS.