Abstract: This paper presents a novel millimeter wave dual- band bandpass filter design using dual mode substrate integrated waveguide (SIW) resonator and dual mode stripline resonator. The stripline resonator is embedded in the dual mode substrate integrated waveguide resonator, which does not occupy additional circuit area. Two independent passbands can be realized by using TEM mode of stripline resonator and two degenerate modes TE102 and TE201 of substrate integrated waveguide resonator. Therefore, it brings great flexibility to design dual-band filters as the two passbands can be independently designed. Furthermore, the proposed filter has three transmission zeros, which achieves high out-of-band rejection and high band-to-band isolations. The measured results show that the dual band filter works at 28. 4 GHz and 32. 2 GHz, and 3 dB bandwidths are 2% and 3% respectively. The simulated and measured results are in good agreement, which proves the reliability of the design method.