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Dual-frequency patch antennas may provide an alternative to large bandwidth planar antennas, in applications in which large bandwidth is really needed for operating at to separate transmit-receive bands. When the two frequencies are far apart, a dual frequency patch structure can be conceived to avoid the use of separate antennas. In this paper the multiport analysis is coupled with an intelligent fuzzy method, to design dual-band microstrip antennas with shorting strips. An efficient CAD tool is proposed to design this type of antennas. Simulation results are compared to the results obtained by the FEM-based software, HFSS and the experimental results are also included.