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Using concave rectangular patches, a new solution to reduce mutual couplingand return loss in two-dimensional array of microstrip antennas is proposed.The effect of width and length concavity on mutual coupling and return loss isstudied. Also, the patch parameters as well as the amounts of width and lengthconcavity are optimized using an enhanced genetic algorithm. Simulation resultsshow that the resulting array antenna has low amounts of mutual coupling andreturn loss.

Mutual Coupling Reduction in Two-Dimensional Array of Microstrip Antennas Using Concave Rectangular Patches