Application of FEM technique in realization of PIN Diode attenuator

FEM analysis has been used to optimize various microstrip line sections used for designing PIN-Diode ¿ attenuator used for phased array antenna applications. Results have been compared with the theoretical results obtained from closed form analysis expressions of microstrip line. An error of only 0.92% has been observed between the two results at 50¿ characteristic impedance for unshielded microstrip line.