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Compact quint-band bandpass filter (QB-BPF) based on a novel pentamode resonator (PMR) is presented. The first five resonant modes of the proposed PMR can be independently controlled by shorted highimpedance section of quarter-wave stepped impedance resonators, and four loaded open stubs resulting in the independency of centre frequencies and quality factors of five passbands. Meanwhile, due to the multipath propagation induced from cross-coupling, 11 transmission zeros are realised around five passbands, resulting in high passband selectivity. As an example, a QB-BPF operating at 0.63/1.2/1.8/2.45/ 3.5 GHz is designed and fabricated. The fabricated QB-BPF also has a compact size of 0.18λ g × 0.12λ g .

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