Abstract: Filters is a kind of important components in microwave and millimeter wave circuits and systems. In this paper, a novel substrate integrated waveguide cavity filter are designed, fabricated, and tested. Being fabricated on printed circuit boards (PCB), such kinds of filters take advantages of the high Q-factor, high power capacity and small size. The filters are designed at the center frequency of 5.8GHz, the fractional bandpass width (FBW) is 4.95%, and the minimum insertion loss is less than 1.3dB. Both numerical simulations and experimental results are presented to show the good performance of the design.