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A microstrip interlocked-coupled bandpass filter is proposed with a markedly compact structure.The low-impedance open-end line of the quarter-wavelength Stepped-Impedance Resonator (SIR) is replaced by two open-end high-impedance lines,which not only facilitate the coupling mechanism but also provide the strong electric coupling between resonators.With the proper utilization of folded SIRs,the occupied area of coupled-resonator pair can be reduced.By applying the proposed coupled-resonator pair,the passband filter with the compact size can be realized.Good agreement between measured and simulated results is observed.The proposed filter is desirable for compact and high-performance microwave circuit applications.