Abstract: A new implementation method of the miniaturized absorptive bandpass filter based on LTCC technology is proposed. The absorptive filter consists of two fourth-order comb-line bandpass filters and two 3 dB orthogonal directional couplers based on the coupled cancellation principle. In order to reduce the physical volume,comb-line bandpass filters adopt three-layer short-circuit coupled line structures,couplers adopt two-layer serpentine wide-edge coupled stripline structures,and two comb-line bandpass filters are placed above and below. By the three-dimensional electromagnetic simulation software HFSS modeling and simulating,an absorptive bandpass filter with an absorptive band range from 2 GHz to 4 GHz and a filtering band range from 2.85 GHz to 3.25 GHz is designed. The insertion loss in the passband is less than 2 dB,the VSWR of each port is better than 1.4,and the attenuation in the low stop band from 0 GHz to 2.55 GHz and the high stop band from 3.55 GHz to 5 GHz is greater than 30 dB. The volume is only 8.4 mm×5 mm×2.5 mm. The measurement results show a good match with the HFSS simulation.