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The purpose of this paper is to discuss the practical and     experimental results obtained from the design, construction,     and test of an array of circular microstrip elements. The aim     of this antenna construction was to obtain a gain of     12 dB, an acceptable pattern, and a reasonable value of     SWR for altimeter system application. In this paper, the     cavity model was applied to analyze the patch and a proper     combination of ordinary formulas; HPHFSS software and     Microwave Office software were used. The array includes four     circular elements with equal sizes and equal spacing and was     planed on a substrate. The method of analysis, design, and     development of this antenna array is explained completely     here. The antenna is simulated and is completely analyzed by     commercial HPHFSS software. Microwave Office 2006 software has     been used to initially simulate and find the optimum design     and results. Comparison between practical results and the     results obtained from the simulation shows that we reached     our goals by a great degree of validity

Circular Microstrip Patch Array Antenna for C-Band Altimeter System