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(a) The minimum value of the VSWR for the proposed four antenna structures by selecting the substrate as FR4, is 1.51 at 3.38 GHz, 1.18 at 3.39 GHz, 1.83 at 7.27 GHz, respectively, and 2.21 at 8.64 GHz. (b) The minimum value of the VSWR for the proposed four antenna structures by selecting the substrate as Rogers RT Duroid 5880 are 1.05 at 6.49 GHz, 1.03 at 6.52 GHz, 2.33 at 8.83 GHz and 5.67 at 8.80 GHz.
