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Measured and simulated reflectance response analysis using the FR-4 as substrate. The number of bands for the proposed four structures is 3, 2, 3 and 1. Minimum reflectance responses are, respectively, −26.11 dB, −21.52 dB, −11 dB and −10.10 dB. The resonance frequency is, respectively, 3.38 GHz, 3.39 GHz, 7.27 GHz and 8.64 GHz. (a) CPIO and SWT Design Structure. (b) CPIO and SWOT Design Structure. (c) DCPIO and SWT Structure. (d) DCPIO and SWOT Structure.
