The present disclosure provides a millimeter wave LTCC filter including system ground layers and metalized vias; two first perturbation metallized vias provided in a first substrate integrated waveguide unit and two second perturbation metallized vias provided in a second substrate integrated waveguide unit; the two first perturbation metallized vias are symmetrically provided on a first diagonal of the first closed resonant cavity with respect to a geometric center of the first closed resonant cavity; the two second perturbation metallized vias are symmetrically provided on a second diagonal of the second closed resonant cavity with respect to a geometric center of the second closed resonant cavity, and the first diagonal and the second diagonal are orthogonal to each other; a first port and a second port. Compared with the related art, the millimeter wave LTCC filter of the present disclosure is small in volume, large in bandwidth, and low in loss.
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