The Surface Equivalence principle and Multiport Network method (SEMN) have been previously developed for
analysis of arbitrary shaped microstrip
antennas. However, the computation time
for analysis of finite and infinite microstrip
arrays by the SEMN method in spite of its
generality makes it impractical. Even,
analysis of single element microstrip
antennas without considering geometrical
and methodological symmetries takes some days by a 2GHz computer. In this
paper, new algorithms that speeds up the
calculation spectacularly are introduced that enables us to analyze large structures
and arrays with no loss in accuracy and
generality of SEMN method. The modified
SEMN method is then applied to a four
element microstrip array antenna and the calculated results are compared with measurement. Additionally, an infinite periodic microstrip array antenna is analyzed by the modified SEMN method where the convergence rate of the involved double infinite summations is increased by the Shank's method. The infinite periodic microstrip patch array antenna analysis is in excellent agreement with the MoM (Method of Moment) solutions.
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