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A novel compact waveguide resonator in planar form with EBG is presented in this paper. Dielectric-filled rectangular waveguide is fitted with periodical arrays of metal plates at its top and bottom surfaces. Periodic resonators are designed and simulated with a resonant frequency of 2.4 GHz. Proposed structures are compact and perform a higher Q factor than their conventional waveguide planar counterparts. This is achieved by alternation of electromagnetic properties of the waveguide. A novel compact EBG-substrate bandpass filter in planar form demonstrates feasibility of the proposed resonators.