This article presents an analysis of substrate-integrated waveguide (SIW) hexagonal resonator structure and its applications to bandpass filters are submitted. The filter is composed of The developed third-order hexagonal resonator filter structure side-by-side horizontally oriented SIW cavities, which are coupled in turn by evanescent waveguide sections with three direct couplings and one cross-coupling between the first and third SIW cavities. Since any of the six sides of a hexagonal resonator can be utilized for lovemaking, the filter configurations are flexible and adaptable. By changing the coupling sides of the hexagonal resonators, two types of experimental circuit configuration at the same central frequency of 8.15 GHz but with different fractional bandwidths of 3 and 6%, including third-order Chebyshev and crossed-coupling trisection, are constructed, fabricated, and measured. To validate the proposed structure, third-order bandpass pooled filters, of the Chebyshev type, are designed using the printed circuit. The final results show simulation is almost similar to the ideal results. Filters display a simple, selective structure of frequency.